diff --git a/aegisub/src/base_grid.cpp b/aegisub/src/base_grid.cpp
index ef60a51de..ca264ddd7 100644
--- a/aegisub/src/base_grid.cpp
+++ b/aegisub/src/base_grid.cpp
@@ -46,10 +46,11 @@
 #include <wx/sizer.h>
 #endif
 
-#include "include/aegisub/hotkey.h"
-
 #include "base_grid.h"
 
+#include "include/aegisub/context.h"
+#include "include/aegisub/hotkey.h"
+
 #include "ass_dialogue.h"
 #include "ass_file.h"
 #include "ass_style.h"
@@ -70,33 +71,20 @@ static inline void set_difference(const S1 &src1, const S2 &src2, D &dst) {
 		std::inserter(dst, dst.begin()));
 }
 
-
-/// @brief Constructor 
-/// @param parent 
-/// @param id     
-/// @param pos    
-/// @param size   
-/// @param style  
-/// @param name   
-///
-BaseGrid::BaseGrid(wxWindow* parent, wxWindowID id, const wxPoint& pos, const wxSize& size, long style, const wxString& name)
-: wxWindow(parent, id, pos, size, style, name)
-, context(VideoContext::Get())
+BaseGrid::BaseGrid(wxWindow* parent, agi::Context *context, const wxSize& size, long style, const wxString& name)
+: wxWindow(parent, -1, wxDefaultPosition, size, style, name)
+, lineHeight(1) // non-zero to avoid div by 0
+, lastRow(-1)
+, extendRow(-1)
+, holding(false)
+, bmp(0)
+, active_line(0)
+, batch_level(0)
+, batch_active_line_changed(false)
+, context(context)
+, yPos(0)
+, byFrame(false)
 {
-	// Misc variables
-	lastRow = -1;
-	yPos = 0;
-	extendRow = -1;
-	bmp = NULL;
-	holding = false;
-	byFrame = false;
-	lineHeight = 1; // non-zero to avoid div by 0
-	active_line = 0;
-
-	batch_level = 0;
-	batch_active_line_changed = false;
-
-	// Set scrollbar
 	scrollBar = new wxScrollBar(this,GRID_SCROLLBAR,wxDefaultPosition,wxDefaultSize,wxSB_VERTICAL);
 	scrollBar->SetScrollbar(0,10,100,10);
 
@@ -128,8 +116,6 @@ BaseGrid::BaseGrid(wxWindow* parent, wxWindowID id, const wxPoint& pos, const wx
 	OPT_SUB("Subtitle/Grid/Highlight Subtitles in Frame", Refresh);
 }
 
-
-
 /// @brief Destructor 
 ///
 BaseGrid::~BaseGrid() {
@@ -137,8 +123,6 @@ BaseGrid::~BaseGrid() {
 	delete bmp;
 }
 
-
-
 /// @brief Update style 
 ///
 void BaseGrid::UpdateStyle() {
@@ -645,11 +629,11 @@ void BaseGrid::DrawImage(wxDC &dc) {
 		// Lines
 		else if (curDiag) {
 			// Set fields
-			strings.Add(wxString::Format(_T("%i"),curRow+1));
-			strings.Add(wxString::Format(_T("%i"),curDiag->Layer));
+			strings.Add(wxString::Format("%i",curRow+1));
+			strings.Add(wxString::Format("%i",curDiag->Layer));
 			if (byFrame) {
-				strings.Add(wxString::Format(_T("%i"),context->FrameAtTime(curDiag->Start.GetMS(),agi::vfr::START)));
-				strings.Add(wxString::Format(_T("%i"),context->FrameAtTime(curDiag->End.GetMS(),agi::vfr::END)));
+				strings.Add(wxString::Format("%i",context->videoController->FrameAtTime(curDiag->Start.GetMS(),agi::vfr::START)));
+				strings.Add(wxString::Format("%i",context->videoController->FrameAtTime(curDiag->End.GetMS(),agi::vfr::END)));
 			}
 			else {
 				strings.Add(curDiag->Start.GetASSFormated());
@@ -664,7 +648,7 @@ void BaseGrid::DrawImage(wxDC &dc) {
 
 			// Set text
 			int mode = OPT_GET("Subtitle/Grid/Hide Overrides")->GetInt();
-			wxString value = _T("");
+			wxString value;
 
 			// Hidden overrides
 			if (mode == 1 || mode == 2) {
@@ -878,7 +862,7 @@ void BaseGrid::OnMouseEvent(wxMouseEvent &event) {
 			if (dlg == GetActiveLine()) {
 				SetActiveLine(GetDialogue(GetFirstSelRow()));
 			}
-			parentFrame->UpdateToolbar();
+			wxGetApp().frame->UpdateToolbar();
 			lastRow = row;
 			return;
 		}
@@ -886,9 +870,9 @@ void BaseGrid::OnMouseEvent(wxMouseEvent &event) {
 		// Normal click
 		if ((click || dclick) && !shift && !ctrl && !alt) {
 			SetActiveLine(dlg);
-			if (dclick) context->JumpToTime(dlg->Start.GetMS());
+			if (dclick) context->videoController->JumpToTime(dlg->Start.GetMS());
 			SelectRow(row,false);
-			parentFrame->UpdateToolbar();
+			wxGetApp().frame->UpdateToolbar();
 			lastRow = row;
 			return;
 		}
@@ -917,7 +901,7 @@ void BaseGrid::OnMouseEvent(wxMouseEvent &event) {
 				}
 				SetSelectedSet(newsel);
 
-				parentFrame->UpdateToolbar();
+				wxGetApp().frame->UpdateToolbar();
 			}
 			return;
 		}
@@ -1058,9 +1042,9 @@ void BaseGrid::SetColumnWidths() {
 
 			// Times
 			if (byFrame) {
-				int tmp = context->FrameAtTime(curDiag->Start.GetMS(),agi::vfr::START);
+				int tmp = context->videoController->FrameAtTime(curDiag->Start.GetMS(),agi::vfr::START);
 				if (tmp > maxStart) maxStart = tmp;
-				tmp = context->FrameAtTime(curDiag->End.GetMS(),agi::vfr::END);
+				tmp = context->videoController->FrameAtTime(curDiag->End.GetMS(),agi::vfr::END);
 				if (tmp > maxEnd) maxEnd = tmp;
 			}
 		}
@@ -1132,13 +1116,12 @@ int BaseGrid::GetDialogueIndex(AssDialogue *diag) const {
 /// @param line 
 /// @return 
 ///
-bool BaseGrid::IsDisplayed(AssDialogue *line) {
-	VideoContext* con = VideoContext::Get();
-	if (!con->IsLoaded()) return false;
-	int frame = con->GetFrameN();
+bool BaseGrid::IsDisplayed(const AssDialogue *line) const {
+	if (!context->videoController->IsLoaded()) return false;
+	int frame = context->videoController->GetFrameN();
 	return
-		con->FrameAtTime(line->Start.GetMS(),agi::vfr::START) <= frame &&
-		con->FrameAtTime(line->End.GetMS(),agi::vfr::END) >= frame;
+		context->videoController->FrameAtTime(line->Start.GetMS(),agi::vfr::START) <= frame &&
+		context->videoController->FrameAtTime(line->End.GetMS(),agi::vfr::END) >= frame;
 }
 
 /// @brief Key press 
@@ -1166,7 +1149,7 @@ void BaseGrid::OnKeyDown(wxKeyEvent &event) {
 
 	// Left/right, forward to seek bar if video is loaded
 	if (key == WXK_LEFT || key == WXK_RIGHT) {
-		if (context->IsLoaded()) {
+		if (context->videoController->IsLoaded()) {
 			/// todo: is this nessesary, or can left/right just be in the Subtitle Grid category?
 			hotkey::check("Video", event.GetKeyCode(), event.GetUnicodeKey(), event.GetModifiers());
 		}
diff --git a/aegisub/src/base_grid.h b/aegisub/src/base_grid.h
index fb96b86b4..a214ac05b 100644
--- a/aegisub/src/base_grid.h
+++ b/aegisub/src/base_grid.h
@@ -48,11 +48,10 @@
 
 #include "selection_controller.h"
 
+namespace agi { struct Context; }
 class AssEntry;
 class AssDialogue;
 class SubsEditBox;
-class FrameMain;
-class VideoContext;
 
 /// DOCME
 typedef std::list<AssEntry*>::iterator entryIter;
@@ -112,10 +111,7 @@ protected:
 	/// DOCME
 	int colWidth[16];
 
-	/// DOCME
-	FrameMain *parentFrame;
-
-	VideoContext *context;
+	agi::Context *context;
 
 	/// DOCME
 	static const int columns = 10;
@@ -145,10 +141,6 @@ public:
 	virtual void PrevLine();
 
 public:
-
-	/// DOCME
-	SubsEditBox *editBox;
-
 	/// DOCME
 	bool byFrame;
 
@@ -161,7 +153,7 @@ public:
 	void SelectRow(int row, bool addToSelected = false, bool select=true);
 	void ClearSelection();
 	bool IsInSelection(int row, int col=0) const;
-	static bool IsDisplayed(AssDialogue *line);
+	bool IsDisplayed(const AssDialogue *line) const;
 	int GetNumberSelection() const;
 	int GetFirstSelRow() const;
 	int GetLastSelRow() const;
@@ -182,7 +174,7 @@ public:
 	AssDialogue *GetDialogue(int n) const;
 	int GetDialogueIndex(AssDialogue *diag) const;
 
-	BaseGrid(wxWindow* parent, wxWindowID id, const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize, long style = wxWANTS_CHARS, const wxString& name = wxPanelNameStr);
+	BaseGrid(wxWindow* parent, agi::Context *context, const wxSize& size = wxDefaultSize, long style = wxWANTS_CHARS, const wxString& name = wxPanelNameStr);
 	~BaseGrid();
 
 	DECLARE_EVENT_TABLE()
diff --git a/aegisub/src/command/time.cpp b/aegisub/src/command/time.cpp
index 8106894af..ab1c6f4ae 100644
--- a/aegisub/src/command/time.cpp
+++ b/aegisub/src/command/time.cpp
@@ -114,7 +114,7 @@ struct time_frame_current : public Command {
 		}
 
 		// Commit
-		c->subsGrid->ass->Commit(_("shift to frame"), AssFile::COMMIT_TIMES);
+		c->ass->Commit(_("shift to frame"), AssFile::COMMIT_TIMES);
 	}
 };
 
@@ -128,7 +128,7 @@ struct time_shift : public Command {
 
 	void operator()(agi::Context *c) {
 		c->videoController->Stop();
-		DialogShiftTimes(c->parent, c->subsGrid).ShowModal();
+		DialogShiftTimes(c).ShowModal();
 	}
 };
 
@@ -226,7 +226,7 @@ struct time_snap_scene : public Command {
 		}
 
 		// Commit
-		c->subsGrid->ass->Commit(_("snap to scene"), AssFile::COMMIT_TIMES);
+		c->ass->Commit(_("snap to scene"), AssFile::COMMIT_TIMES);
 	}
 };
 
diff --git a/aegisub/src/command/tool.cpp b/aegisub/src/command/tool.cpp
index 4749fc4ab..506016f92 100644
--- a/aegisub/src/command/tool.cpp
+++ b/aegisub/src/command/tool.cpp
@@ -84,7 +84,7 @@ struct tool_export : public Command {
 
 	void operator()(agi::Context *c) {
 		c->videoController->Stop();
-		DialogResample(c->parent, c->subsGrid).ShowModal();
+		DialogResample(c).ShowModal();
 	}
 };
 
@@ -126,7 +126,7 @@ struct tool_resampleres : public Command {
 
 	void operator()(agi::Context *c) {
 		c->videoController->Stop();
-		DialogResample(c->parent, c->subsGrid).ShowModal();
+		DialogResample(c).ShowModal();
 	}
 };
 
@@ -155,7 +155,7 @@ struct tool_style_manager : public Command {
 
 	void operator()(agi::Context *c) {
 		c->videoController->Stop();
-		DialogStyleManager(c->parent, c->subsGrid).ShowModal();
+		DialogStyleManager(c).ShowModal();
 	}
 };
 
@@ -168,7 +168,7 @@ struct tool_time_kanji : public Command {
 	STR_HELP("Open Kanji timer.")
 
 	void operator()(agi::Context *c) {
-		DialogKanjiTimer(c->parent, c->subsGrid).ShowModal();
+		DialogKanjiTimer(c).ShowModal();
 	}
 };
 
@@ -181,7 +181,7 @@ struct tool_time_postprocess : public Command {
 	STR_HELP("Runs a post-processor for timing to deal with lead-ins, lead-outs, scene timing and etc.")
 
 	void operator()(agi::Context *c) {
-		DialogTimingProcessor(c->parent, c->subsGrid).ShowModal();
+		DialogTimingProcessor(c).ShowModal();
 	}
 };
 
diff --git a/aegisub/src/dialog_kara_timing_copy.cpp b/aegisub/src/dialog_kara_timing_copy.cpp
index e6e7a2d07..1a0425352 100644
--- a/aegisub/src/dialog_kara_timing_copy.cpp
+++ b/aegisub/src/dialog_kara_timing_copy.cpp
@@ -53,6 +53,7 @@
 #include "ass_style.h"
 #include "dialog_kara_timing_copy.h"
 #include "help_button.h"
+#include "include/aegisub/context.h"
 #include "libresrc/libresrc.h"
 #include "main.h"
 #include "selection_controller.h"
@@ -68,7 +69,18 @@
 /// DOCME
 #define TEXT_LABEL_DEST _("Dest: ")
 
-
+// IDs
+enum {
+	BUTTON_KTSTART = 2500,
+	BUTTON_KTLINK,
+	BUTTON_KTUNLINK,
+	BUTTON_KTSKIPSOURCE,
+	BUTTON_KTSKIPDEST,
+	BUTTON_KTGOBACK,
+	BUTTON_KTACCEPT,
+	TEXT_SOURCE,
+	TEXT_DEST
+};
 
 /// DOCME
 /// @class KaraokeLineMatchDisplay
@@ -823,15 +835,15 @@ bool KaraokeLineMatchDisplay::UndoMatch()
 /// @param parent 
 /// @param _grid  
 ///
-DialogKanjiTimer::DialogKanjiTimer(wxWindow *parent, SubtitlesGrid *_grid)
-: wxDialog (parent,-1,_("Kanji timing"),wxDefaultPosition)
+DialogKanjiTimer::DialogKanjiTimer(agi::Context *c)
+: wxDialog(c->parent,-1,_("Kanji timing"),wxDefaultPosition)
 {
 	// Set icon
 	SetIcon(BitmapToIcon(GETIMAGE(kara_timing_copier_24)));
 
 	// Variables
-	subs = _grid->ass;
-	grid = _grid;
+	subs = c->ass;
+	grid = c->subsGrid;
 	currentSourceLine = subs->Line.begin();
 	currentDestinationLine = subs->Line.begin();
 
@@ -941,7 +953,7 @@ void DialogKanjiTimer::OnClose(wxCommandEvent &event) {
 		line->Text = p.second;
 	}
 	if (modified) {
-		grid->ass->Commit(_("kanji timing"));
+		subs->Commit(_("kanji timing"));
 		LinesToChange.clear();
 	}
 	Close();
diff --git a/aegisub/src/dialog_kara_timing_copy.h b/aegisub/src/dialog_kara_timing_copy.h
index e2e3b0a5a..d433e41b4 100644
--- a/aegisub/src/dialog_kara_timing_copy.h
+++ b/aegisub/src/dialog_kara_timing_copy.h
@@ -34,11 +34,6 @@
 /// @ingroup tools_ui kara_timing_copy
 ///
 
-
-
-
-///////////
-// Headers
 #ifndef AGI_PRE
 #include <vector>
 
@@ -53,13 +48,10 @@
 #include "ass_file.h"
 #include "kana_table.h"
 
-
-//////////////
-// Prototypes
-class SubtitlesGrid;
+namespace agi { struct Context; }
 class AssOverrideParameter;
 class KaraokeLineMatchDisplay;
-
+class SubtitlesGrid;
 
 
 /// DOCME
@@ -114,40 +106,7 @@ class DialogKanjiTimer : public wxDialog {
 	entryIter FindPrevStyleMatch(entryIter search_from, const wxString &search_style);
 
 public:
-	DialogKanjiTimer(wxWindow *parent, SubtitlesGrid *grid);
+	DialogKanjiTimer(agi::Context *context);
 	void OnKeyDown(wxKeyEvent &event);
 	DECLARE_EVENT_TABLE()
 };
-
-
-///////
-// IDs
-enum {
-
-	/// DOCME
-	BUTTON_KTSTART = 2500,
-
-	/// DOCME
-	BUTTON_KTLINK,
-
-	/// DOCME
-	BUTTON_KTUNLINK,
-
-	/// DOCME
-	BUTTON_KTSKIPSOURCE,
-
-	/// DOCME
-	BUTTON_KTSKIPDEST,
-
-	/// DOCME
-	BUTTON_KTGOBACK,
-
-	/// DOCME
-	BUTTON_KTACCEPT,
-
-	/// DOCME
-	TEXT_SOURCE,
-
-	/// DOCME
-	TEXT_DEST
-};
diff --git a/aegisub/src/dialog_resample.cpp b/aegisub/src/dialog_resample.cpp
index 90321b637..f419fa6da 100644
--- a/aegisub/src/dialog_resample.cpp
+++ b/aegisub/src/dialog_resample.cpp
@@ -34,38 +34,43 @@
 /// @ingroup tools_ui
 ///
 
-
-///////////
-// Headers
 #include "config.h"
 
+#ifndef AGI_PRE
+#include <wx/msgdlg.h>
+#include <wx/sizer.h>
+#include <wx/stattext.h>
+#endif
+
 #include "ass_dialogue.h"
 #include "ass_file.h"
 #include "ass_override.h"
 #include "ass_style.h"
 #include "dialog_resample.h"
+#include "include/aegisub/context.h"
 #include "help_button.h"
 #include "libresrc/libresrc.h"
-#include "subs_grid.h"
 #include "utils.h"
 #include "validators.h"
 #include "video_context.h"
 
+// IDs
+enum {
+	BUTTON_DEST_FROM_VIDEO = 1520,
+	CHECK_ANAMORPHIC,
+	CHECK_SYMMETRICAL,
+	TEXT_MARGIN_T,
+	TEXT_MARGIN_L,
+	TEXT_MARGIN_R,
+	TEXT_MARGIN_B
+};
 
-/// @brief Constructor 
-/// @param parent 
-/// @param _grid  
-///
-DialogResample::DialogResample(wxWindow *parent, SubtitlesGrid *_grid)
-: wxDialog (parent,-1,_("Resample resolution"),wxDefaultPosition)
+DialogResample::DialogResample(agi::Context *c)
+: wxDialog(c->parent,-1,_("Resample resolution"),wxDefaultPosition)
 {
 	// Set icon
 	SetIcon(BitmapToIcon(GETIMAGE(resample_toolbutton_24)));
 
-	// Variables
-	AssFile *subs = _grid->ass;
-	grid = _grid;
-
 	// Margins
 	MarginSymmetrical = NULL;	// Do not remove this
 	wxSizer *MarginBoxSizer = new wxStaticBoxSizer(wxVERTICAL,this,_("Margin offset"));
@@ -93,7 +98,7 @@ DialogResample::DialogResample(wxWindow *parent, SubtitlesGrid *_grid)
 	wxSizer *ResBoxSizer = new wxStaticBoxSizer(wxVERTICAL,this,_("Resolution"));
 	wxSizer *ResSizer = new wxBoxSizer(wxHORIZONTAL);
 	int sw,sh;
-	subs->GetResolution(sw,sh);
+	c->ass->GetResolution(sw,sh);
 	ResXValue = wxString::Format(_T("%i"),sw);
 	ResYValue = wxString::Format(_T("%i"),sh);
 	ResX = new wxTextCtrl(this,-1,_T(""),wxDefaultPosition,wxSize(50,-1),0,NumValidator(&ResXValue));
@@ -222,10 +227,8 @@ void DialogResample::DoResampleTags (wxString name,int n,AssOverrideParameter *c
 /// @return 
 ///
 void DialogResample::OnResample (wxCommandEvent &event) {
-	// Resolutions
-	AssFile *subs = grid->ass;
 	int x1,y1;
-	subs->GetResolution(x1,y1);
+	c->ass->GetResolution(x1,y1);
 	long x2 = 0;
 	long y2 = 0;
 	ResX->GetValue().ToLong(&x2);
@@ -261,7 +264,7 @@ void DialogResample::OnResample (wxCommandEvent &event) {
 	// Iterate through subs
 	AssStyle *curStyle;
 	AssDialogue *curDiag;
-	for (entryIter cur=subs->Line.begin();cur!=subs->Line.end();cur++) {
+	for (entryIter cur=c->ass->Line.begin();cur!=c->ass->Line.end();cur++) {
 		// Apply to dialogues
 		curDiag = dynamic_cast<AssDialogue*>(*cur);
 		if (curDiag && !(curDiag->Comment && (curDiag->Effect.StartsWith(_T("template")) || curDiag->Effect.StartsWith(_T("code"))))) {
@@ -316,11 +319,11 @@ void DialogResample::OnResample (wxCommandEvent &event) {
 	}
 
 	// Change script resolution
-	subs->SetScriptInfo(_T("PlayResX"),wxString::Format(_T("%i"),x2));
-	subs->SetScriptInfo(_T("PlayResY"),wxString::Format(_T("%i"),y2));
+	c->ass->SetScriptInfo(_T("PlayResX"),wxString::Format(_T("%i"),x2));
+	c->ass->SetScriptInfo(_T("PlayResY"),wxString::Format(_T("%i"),y2));
 
 	// Flag as modified
-	subs->Commit(_("resolution resampling"), AssFile::COMMIT_TEXT);
+	c->ass->Commit(_("resolution resampling"), AssFile::COMMIT_TEXT);
 	EndModal(0);
 }
 
@@ -364,9 +367,5 @@ void DialogResample::OnMarginChange (wxCommandEvent &event) {
 	}
 }
 
-
-
 /// DOCME
 DialogResample *DialogResample::instance = NULL;
-
-
diff --git a/aegisub/src/dialog_resample.h b/aegisub/src/dialog_resample.h
index 81ef1f504..61869bf1f 100644
--- a/aegisub/src/dialog_resample.h
+++ b/aegisub/src/dialog_resample.h
@@ -34,11 +34,6 @@
 /// @ingroup tools_ui
 ///
 
-
-
-
-///////////
-// Headers
 #ifndef AGI_PRE
 #include <wx/checkbox.h>
 #include <wx/dialog.h>
@@ -46,10 +41,7 @@
 #include <wx/textctrl.h>
 #endif
 
-
-//////////////
-// Prototypes
-class SubtitlesGrid;
+namespace agi { struct Context; }
 class AssOverrideParameter;
 
 
@@ -60,10 +52,7 @@ class AssOverrideParameter;
 ///
 /// DOCME
 class DialogResample : public wxDialog {
-private:
-
-	/// DOCME
-	SubtitlesGrid *grid;
+	agi::Context *c;
 
 	/// DOCME
 
@@ -119,34 +108,7 @@ private:
 	void DoResampleTags (wxString name,int n,AssOverrideParameter *curParam,void *_curDiag);
 
 public:
-	DialogResample(wxWindow *parent, SubtitlesGrid *grid);
+	DialogResample(agi::Context *context);
 
 	DECLARE_EVENT_TABLE()
 };
-
-
-///////
-// IDs
-enum {
-
-	/// DOCME
-	BUTTON_DEST_FROM_VIDEO = 1520,
-
-	/// DOCME
-	CHECK_ANAMORPHIC,
-
-	/// DOCME
-	CHECK_SYMMETRICAL,
-
-	/// DOCME
-	TEXT_MARGIN_T,
-
-	/// DOCME
-	TEXT_MARGIN_L,
-
-	/// DOCME
-	TEXT_MARGIN_R,
-
-	/// DOCME
-	TEXT_MARGIN_B
-};
diff --git a/aegisub/src/dialog_search_replace.cpp b/aegisub/src/dialog_search_replace.cpp
index a4cdc9226..bb61b759e 100644
--- a/aegisub/src/dialog_search_replace.cpp
+++ b/aegisub/src/dialog_search_replace.cpp
@@ -34,9 +34,6 @@
 /// @ingroup secondary_ui
 ///
 
-
-///////////
-// Headers
 #include "config.h"
 
 #ifndef AGI_PRE
@@ -48,6 +45,7 @@
 #include "ass_dialogue.h"
 #include "ass_file.h"
 #include "dialog_search_replace.h"
+#include "include/aegisub/context.h"
 #include "frame_main.h"
 #include "main.h"
 #include "selection_controller.h"
@@ -56,6 +54,15 @@
 #include "subs_grid.h"
 #include "video_display.h"
 
+// IDs
+enum {
+	BUTTON_FIND_NEXT,
+	BUTTON_REPLACE_NEXT,
+	BUTTON_REPLACE_ALL,
+	CHECK_MATCH_CASE,
+	CHECK_REGEXP,
+	CHECK_UPDATE_VIDEO
+};
 
 /// @brief Constructor 
 /// @param parent      
@@ -234,7 +241,7 @@ void DialogSearchReplace::FindReplace(int mode) {
 			wxString ReplaceWith = ReplaceEdit->GetValue();
 			Search.ReplaceWith = ReplaceWith;
 			config::mru->Add("Replace", STD_STR(ReplaceWith));
-		}	
+		}
 	}
 
 	// Replace
@@ -346,7 +353,7 @@ void SearchReplaceEngine::ReplaceNext(bool DoReplace) {
 		return;
 	}
 	
-	wxArrayInt sels = grid->GetSelection();
+	wxArrayInt sels = context->subsGrid->GetSelection();
 	int firstLine = 0;
 	if (sels.Count() > 0) firstLine = sels[0];
 	// if selection has changed reset values
@@ -361,7 +368,7 @@ void SearchReplaceEngine::ReplaceNext(bool DoReplace) {
 
 	// Setup
 	int start = curLine;
-	int nrows = grid->GetRows();
+	int nrows = context->subsGrid->GetRows();
 	bool found = false;
 	wxString *Text = NULL;
 	size_t tempPos;
@@ -434,7 +441,7 @@ void SearchReplaceEngine::ReplaceNext(bool DoReplace) {
 			}
 
 			// Commit
-			grid->ass->Commit(_("replace"), AssFile::COMMIT_TEXT);
+			context->ass->Commit(_("replace"), AssFile::COMMIT_TEXT);
 		}
 
 		else {
@@ -442,16 +449,16 @@ void SearchReplaceEngine::ReplaceNext(bool DoReplace) {
 		}
 
 		// Select
-		grid->SelectRow(curLine,false);
-		grid->MakeCellVisible(curLine,0);
+		context->subsGrid->SelectRow(curLine,false);
+		context->subsGrid->MakeCellVisible(curLine,0);
 		if (field == 0) {
-			grid->SetActiveLine(grid->GetDialogue(curLine));
-			grid->editBox->TextEdit->SetSelectionU(pos,pos+replaceLen);
+			context->subsGrid->SetActiveLine(context->subsGrid->GetDialogue(curLine));
+			context->editBox->TextEdit->SetSelectionU(pos,pos+replaceLen);
 		}
 
 		// Update video
 		if (updateVideo) {
-			grid->SetVideoToSubs(true);
+			context->subsGrid->SetVideoToSubs(true);
 		}
 		else if (DoReplace) Modified = true;
 
@@ -468,7 +475,7 @@ void SearchReplaceEngine::ReplaceNext(bool DoReplace) {
 void SearchReplaceEngine::ReplaceAll() {
 	// Setup
 	wxString *Text;
-	int nrows = grid->GetRows();
+	int nrows = context->subsGrid->GetRows();
 	size_t count = 0;
 	int regFlags = wxRE_ADVANCED;
 	if (!matchCase) {
@@ -476,11 +483,11 @@ void SearchReplaceEngine::ReplaceAll() {
 		//else LookFor.MakeLower();
 	}
 	bool replaced;
-	grid->BeginBatch();
+	context->subsGrid->BeginBatch();
 
 	// Selection
 	bool hasSelection = false;
-	wxArrayInt sels = grid->GetSelection();
+	wxArrayInt sels = context->subsGrid->GetSelection();
 	if (sels.Count() > 0) hasSelection = true;
 	bool inSel = false;
 	if (affect == 1) inSel = true;
@@ -538,7 +545,7 @@ void SearchReplaceEngine::ReplaceAll() {
 
 	// Commit
 	if (count > 0) {
-		grid->ass->Commit(_("replace"), AssFile::COMMIT_TEXT);
+		context->ass->Commit(_("replace"), AssFile::COMMIT_TEXT);
 		wxMessageBox(wxString::Format(_("%i matches were replaced."),count));
 	}
 
@@ -546,7 +553,7 @@ void SearchReplaceEngine::ReplaceAll() {
 	else {
 		wxMessageBox(_("No matches found."));
 	}
-	grid->EndBatch();
+	context->subsGrid->EndBatch();
 	LastWasFind = false;
 }
 
@@ -556,7 +563,7 @@ void SearchReplaceEngine::ReplaceAll() {
 ///
 void SearchReplaceEngine::OnDialogOpen() {
 	// Set curline
-	wxArrayInt sels = grid->GetSelection();
+	wxArrayInt sels = context->subsGrid->GetSelection();
 	curLine = 0;
 	if (sels.Count() > 0) curLine = sels[0];
 
@@ -603,7 +610,7 @@ void SearchReplaceEngine::OpenDialog (bool replace) {
 /// @return 
 ///
 wxString *SearchReplaceEngine::GetText(int n,int field) {
-	AssDialogue *cur = grid->GetDialogue(n);
+	AssDialogue *cur = context->subsGrid->GetDialogue(n);
 	if (field == 0) return &cur->Text;
 	else if (field == 1) return &cur->Style;
 	else if (field == 2) return &cur->Actor;
diff --git a/aegisub/src/dialog_search_replace.h b/aegisub/src/dialog_search_replace.h
index 148f76ee6..40dccf09b 100644
--- a/aegisub/src/dialog_search_replace.h
+++ b/aegisub/src/dialog_search_replace.h
@@ -34,11 +34,6 @@
 /// @ingroup secondary_ui
 ///
 
-
-
-
-///////////
-// Headers
 #ifndef AGI_PRE
 #include <wx/checkbox.h>
 #include <wx/combobox.h>
@@ -48,11 +43,7 @@
 #include <wx/textctrl.h>
 #endif
 
-
-//////////////
-// Prototypes
-class SubtitlesGrid;
-
+namespace agi { struct Context; }
 
 
 /// DOCME
@@ -61,8 +52,6 @@ class SubtitlesGrid;
 ///
 /// DOCME
 class SearchReplaceEngine {
-private:
-
 	/// DOCME
 	int curLine;
 
@@ -85,11 +74,10 @@ private:
 	bool hasReplace;
 
 	wxString *GetText(int n,int field);
-	
-public:
 
+public:
 	/// DOCME
-	SubtitlesGrid *grid;
+	agi::Context *context;
 
 	/// DOCME
 	bool isReg;
@@ -186,29 +174,3 @@ public:
 
 	DECLARE_EVENT_TABLE()
 };
-
-
-///////
-// IDs
-enum {
-
-	/// DOCME
-	BUTTON_FIND_NEXT,
-
-	/// DOCME
-	BUTTON_REPLACE_NEXT,
-
-	/// DOCME
-	BUTTON_REPLACE_ALL,
-
-	/// DOCME
-	CHECK_MATCH_CASE,
-
-	/// DOCME
-	CHECK_REGEXP,
-
-	/// DOCME
-	CHECK_UPDATE_VIDEO
-};
-
-
diff --git a/aegisub/src/dialog_shift_times.cpp b/aegisub/src/dialog_shift_times.cpp
index 1faee1288..5f6846a16 100644
--- a/aegisub/src/dialog_shift_times.cpp
+++ b/aegisub/src/dialog_shift_times.cpp
@@ -34,9 +34,6 @@
 /// @ingroup secondary_ui
 ///
 
-
-///////////
-// Headers
 #include "config.h"
 
 #ifndef AGI_PRE
@@ -46,6 +43,10 @@
 
 #include <wx/filefn.h>
 #include <wx/filename.h>
+#include <wx/listbox.h>
+#include <wx/radiobox.h>
+#include <wx/radiobut.h>
+#include <wx/textctrl.h>
 #endif
 
 #include "ass_dialogue.h"
@@ -53,28 +54,36 @@
 #include "ass_time.h"
 #include "charset_conv.h"
 #include "dialog_shift_times.h"
+#include "include/aegisub/context.h"
 #include "help_button.h"
 #include "libresrc/libresrc.h"
 #include "main.h"
 #include "standard_paths.h"
 #include "subs_grid.h"
+#include "timeedit_ctrl.h"
 #include "utils.h"
 #include "video_context.h"
-#include "video_display.h"
 
-/// @brief Constructor 
-/// @param parent 
-/// @param _grid  
-///
-DialogShiftTimes::DialogShiftTimes (wxWindow *parent,SubtitlesGrid *_grid)
-: wxDialog(parent, -1, _("Shift Times"), wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE, _T("JumpTo"))
+// IDs
+enum {
+	TEXT_SHIFT_TIME = 1100,
+	TEXT_SHIFT_FRAME,
+	RADIO_BACKWARD,
+	RADIO_FORWARD,
+	RADIO_TIME,
+	RADIO_FRAME,
+	SHIFT_CLEAR_HISTORY
+};
+
+DialogShiftTimes::DialogShiftTimes (agi::Context *context)
+: wxDialog(context->parent, -1, _("Shift Times"), wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE, _T("JumpTo"))
+, context(context)
 {
 	// Set icon
 	SetIcon(BitmapToIcon(GETIMAGE(shift_times_toolbutton_24)));
 
 	// Set initial values
 	ready = true;
-	grid = _grid;
 	shiftframe = 0;
 	
 	// Static-box sizers before anything else
@@ -168,7 +177,7 @@ DialogShiftTimes::DialogShiftTimes (wxWindow *parent,SubtitlesGrid *_grid)
 	if (OPT_GET("Tool/Shift Times/Direction")->GetBool()) DirectionBackward->SetValue(true);
 
 	// Has selection?
-	wxArrayInt sel = grid->GetSelection();
+	wxArrayInt sel = context->subsGrid->GetSelection();
 	if (sel.Count() == 0) {
 		SelChoice->Enable(1,false);
 		SelChoice->Enable(2,false);
@@ -226,8 +235,8 @@ void DialogShiftTimes::OnOK(wxCommandEvent &event) {
 	bool didSomething = false;
 
 	// Selection
-	int nrows = grid->GetRows();
-	wxArrayInt sel = grid->GetSelection();
+	int nrows = context->subsGrid->GetRows();
+	wxArrayInt sel = context->subsGrid->GetSelection();
 	int firstSel = 0;
 	if (sel.Count()) firstSel = sel[0];
 
@@ -247,9 +256,9 @@ void DialogShiftTimes::OnOK(wxCommandEvent &event) {
 
 	// Shift
 	for (int i=0;i<nrows;i++) {
-		if (allrows || (i >= firstSel && selOnward) || grid->IsInSelection(i,0)) {
-			if (byTime) grid->ShiftLineByTime(i,len,type);
-			else grid->ShiftLineByFrames(i,len,type);
+		if (allrows || (i >= firstSel && selOnward) || context->subsGrid->IsInSelection(i,0)) {
+			if (byTime) context->subsGrid->ShiftLineByTime(i,len,type);
+			else context->subsGrid->ShiftLineByFrames(i,len,type);
 			didSomething = true;
 		}
 	}
@@ -257,8 +266,8 @@ void DialogShiftTimes::OnOK(wxCommandEvent &event) {
 	// Add entry to history
 	if (didSomething) {
 		if (backward) len = -len;
-		wxString message = _T("");
-		wxFileName assfile(grid->ass->filename);
+		wxString message;
+		wxFileName assfile(context->ass->filename);
 		wxString filename = assfile.GetFullName();
 
 		// File
@@ -309,7 +318,7 @@ void DialogShiftTimes::OnOK(wxCommandEvent &event) {
 	OPT_SET("Tool/Shift Times/Direction")->SetBool(backward);
 
 	// End dialog
-	grid->ass->Commit(_("shifting"), AssFile::COMMIT_TIMES);
+	context->ass->Commit(_("shifting"), AssFile::COMMIT_TIMES);
 	EndModal(0);
 }
 
diff --git a/aegisub/src/dialog_shift_times.h b/aegisub/src/dialog_shift_times.h
index d8c064ad9..74e19af12 100644
--- a/aegisub/src/dialog_shift_times.h
+++ b/aegisub/src/dialog_shift_times.h
@@ -34,26 +34,16 @@
 /// @ingroup secondary_ui
 ///
 
-
-
-
-///////////
-// Headers
 #ifndef AGI_PRE
 #include <wx/dialog.h>
-#include <wx/listbox.h>
-#include <wx/radiobox.h>
-#include <wx/radiobut.h>
 #endif
 
-#include "timeedit_ctrl.h"
-
-
-//////////////
-// Prototypes
-class SubtitlesGrid;
-
-
+namespace agi { struct Context; }
+class TimeEdit;
+class wxListBox;
+class wxRadioBox;
+class wxRadioButton;
+class wxTextCtrl;
 
 /// DOCME
 /// @class DialogShiftTimes
@@ -61,14 +51,11 @@ class SubtitlesGrid;
 ///
 /// DOCME
 class DialogShiftTimes : public wxDialog {
-private:
+	agi::Context *context;
 
 	/// DOCME
 	bool ready;
 
-	/// DOCME
-	SubtitlesGrid *grid;
-
 	/// DOCME
 	int shiftframe;
 
@@ -106,10 +93,6 @@ private:
 	void AppendToHistory(wxString text);
 	void LoadHistory(wxString filename);
 	void OnClear(wxCommandEvent &event);
-
-public:
-	DialogShiftTimes (wxWindow *parent,SubtitlesGrid *grid);
-
 	void OnKey(wxKeyEvent &event);
 	void OnClose(wxCommandEvent &event);
 	void OnOK(wxCommandEvent &event);
@@ -118,32 +101,8 @@ public:
 	void OnRadioTime(wxCommandEvent &event);
 	void OnRadioFrame(wxCommandEvent &event);
 
+public:
+	DialogShiftTimes (agi::Context *context);
+
 	DECLARE_EVENT_TABLE()
 };
-
-
-///////
-// IDs
-enum {
-
-	/// DOCME
-	TEXT_SHIFT_TIME = 1100,
-
-	/// DOCME
-	TEXT_SHIFT_FRAME,
-
-	/// DOCME
-	RADIO_BACKWARD,
-
-	/// DOCME
-	RADIO_FORWARD,
-
-	/// DOCME
-	RADIO_TIME,
-
-	/// DOCME
-	RADIO_FRAME,
-
-	/// DOCME
-	SHIFT_CLEAR_HISTORY
-};
diff --git a/aegisub/src/dialog_spellchecker.cpp b/aegisub/src/dialog_spellchecker.cpp
index c082737db..ac97060a4 100644
--- a/aegisub/src/dialog_spellchecker.cpp
+++ b/aegisub/src/dialog_spellchecker.cpp
@@ -274,7 +274,7 @@ void DialogSpellChecker::SetWord(wxString word) {
 	grid->SelectRow(line,false);
 	grid->MakeCellVisible(line,0);
 	grid->SetActiveLine(grid->GetDialogue(line));
-	grid->editBox->TextEdit->SetSelectionU(wordStart,wordEnd);
+	context->editBox->TextEdit->SetSelectionU(wordStart,wordEnd);
 	grid->EndBatch();
 
 	addButton->Enable(spellchecker->CanAddWord(word));
@@ -381,16 +381,12 @@ bool DialogSpellChecker::FindOrDie() {
 /// @brief Replace 
 ///
 void DialogSpellChecker::Replace() {
-	// Get dialog
-	SubtitlesGrid *grid = context->subsGrid;
-	AssDialogue *diag = grid->GetDialogue(lastLine % grid->GetRows());
+	AssDialogue *diag = context->subsGrid->GetDialogue(lastLine % context->subsGrid->GetRows());
 
-	// Replace
 	diag->Text = diag->Text.Left(wordStart) + replaceWord->GetValue() + diag->Text.Mid(wordEnd);
 	lastPos = wordStart + replaceWord->GetValue().Length();
 
-	// Commit
-	grid->ass->Commit(_("Spell check replace"), AssFile::COMMIT_TEXT);
+	context->ass->Commit(_("Spell check replace"), AssFile::COMMIT_TEXT);
 }
 
 
diff --git a/aegisub/src/dialog_style_editor.cpp b/aegisub/src/dialog_style_editor.cpp
index 8a8ee81e5..bfe35ecfc 100644
--- a/aegisub/src/dialog_style_editor.cpp
+++ b/aegisub/src/dialog_style_editor.cpp
@@ -52,6 +52,7 @@
 #include "ass_style_storage.h"
 #include "compat.h"
 #include "dialog_style_editor.h"
+#include "include/aegisub/context.h"
 #include "help_button.h"
 #include "libresrc/libresrc.h"
 #include "main.h"
@@ -63,124 +64,49 @@
 #include "validators.h"
 
 
-///////
 // IDs
 enum {
-
-	/// DOCME
 	BUTTON_STYLE_FONT = 1050,
-
-	/// DOCME
 	CHECKBOX_STYLE_BOLD,
-
-	/// DOCME
 	CHECKBOX_STYLE_ITALIC,
-
-	/// DOCME
 	CHECKBOX_STYLE_UNDERLINE,
-
-	/// DOCME
 	CHECKBOX_STYLE_STRIKEOUT,
-
-	/// DOCME
 	CHECKBOX_OUTLINE,
-
-	/// DOCME
 	BUTTON_COLOR_1,
-
-	/// DOCME
 	BUTTON_COLOR_2,
-
-	/// DOCME
 	BUTTON_COLOR_3,
-
-	/// DOCME
 	BUTTON_COLOR_4,
-
-	/// DOCME
 	BUTTON_PREVIEW_COLOR,
-
-	/// DOCME
 	RADIO_ALIGNMENT,
-
-	/// DOCME
 	TEXT_FONT_NAME,
-
-	/// DOCME
 	TEXT_FONT_SIZE,
-
-	/// DOCME
 	TEXT_ALPHA_1,
-
-	/// DOCME
 	TEXT_ALPHA_2,
-
-	/// DOCME
 	TEXT_ALPHA_3,
-
-	/// DOCME
 	TEXT_ALPHA_4,
-
-	/// DOCME
 	TEXT_MARGIN_L,
-
-	/// DOCME
 	TEXT_MARGIN_R,
-
-	/// DOCME
 	TEXT_MARGIN_V,
-
-	/// DOCME
 	TEXT_OUTLINE,
-
-	/// DOCME
 	TEXT_SHADOW,
-
-	/// DOCME
 	TEXT_SCALE_X,
-
-	/// DOCME
 	TEXT_SCALE_Y,
-
-	/// DOCME
 	TEXT_ANGLE,
-
-	/// DOCME
 	TEXT_SPACING,
-
-	/// DOCME
 	TEXT_PREVIEW,
-
-	/// DOCME
 	COMBO_ENCODING
 };
 
-
-
-/// @brief Constructor 
-/// @param parent 
-/// @param _style 
-/// @param _grid  
-/// @param local  
-/// @param _store 
-///
-DialogStyleEditor::DialogStyleEditor (wxWindow *parent, AssStyle *_style, SubtitlesGrid *_grid,bool local,AssStyleStorage *_store,bool newStyle)
+DialogStyleEditor::DialogStyleEditor (wxWindow *parent, AssStyle *style, agi::Context *c,bool local,AssStyleStorage *store,bool newStyle)
 : wxDialog (parent,-1,_("Style Editor"),wxDefaultPosition,wxDefaultSize,wxDEFAULT_DIALOG_STYLE | wxRESIZE_BORDER,_T("DialogStyleEditor"))
+, c(c)
+, isLocal(local)
+, isNew(newStyle)
+, work(new AssStyle(*style))
+, store(store)
 {
-	// Set icon
 	SetIcon(BitmapToIcon(GETIMAGE(style_toolbutton_24)));
 
-	// Set variables
-	isLocal = local;
-	isNew = newStyle;
-	store = _store;
-
-	// Set styles
-	grid = _grid;
-	style = _style;
-	work = new AssStyle;
-	*work = *style;
-
 	// Prepare control values
 	FontSizeValue = AegiFloatToString(style->fontsize);
 	OutlineValue = AegiFloatToString(style->outline_w);
@@ -530,13 +456,13 @@ void DialogStyleEditor::Apply (bool apply,bool close) {
 
 		// Get list of existing styles
 		wxArrayString styles;
-		if (isLocal) styles = grid->ass->GetStyles();
+		if (isLocal) styles = c->ass->GetStyles();
 		else if (store) styles = store->GetNames();
 
 		// Check if style name is unique
 		for (unsigned int i=0;i<styles.Count();i++) {
 			if (newStyleName.CmpNoCase(styles[i]) == 0) {
-				if ((isLocal && (grid->ass->GetStyle(styles[i]) != style)) || (!isLocal && (store->GetStyle(styles[i]) != style))) {
+				if ((isLocal && (c->ass->GetStyle(styles[i]) != style)) || (!isLocal && (store->GetStyle(styles[i]) != style))) {
 					wxMessageBox(_T("There is already a style with this name. Please choose another name."),_T("Style name conflict."),wxICON_ERROR|wxOK);
 					return;
 				}
@@ -555,12 +481,12 @@ void DialogStyleEditor::Apply (bool apply,bool close) {
 
 				// Update
 				if (answer == wxYES) {
-					int n = grid->GetRows();
+					int n = c->subsGrid->GetRows();
 					wxArrayString strings;
 					strings.Add(work->name);
 					strings.Add(newStyleName);
 					for (int i=0;i<n;i++) {
-						AssDialogue *curDiag = grid->GetDialogue(i);
+						AssDialogue *curDiag = c->subsGrid->GetDialogue(i);
 						if (curDiag->Style == work->name) curDiag->Style = newStyleName;
 						curDiag->ParseASSTags();
 						curDiag->ProcessParameters(ReplaceStyle,&strings);
@@ -581,7 +507,7 @@ void DialogStyleEditor::Apply (bool apply,bool close) {
 		*style = *work;
 		style->UpdateData();
 		if (isLocal) {
-			grid->ass->Commit(_("style change"), AssFile::COMMIT_TEXT);
+			c->ass->Commit(_("style change"), AssFile::COMMIT_TEXT);
 		}
 
 		// Exit
diff --git a/aegisub/src/dialog_style_editor.h b/aegisub/src/dialog_style_editor.h
index 958e97353..8f7071ac7 100644
--- a/aegisub/src/dialog_style_editor.h
+++ b/aegisub/src/dialog_style_editor.h
@@ -34,11 +34,6 @@
 /// @ingroup style_editor
 ///
 
-
-
-
-////////////
-// Includes
 #ifndef AGI_PRE
 #include <wx/checkbox.h>
 #include <wx/combobox.h>
@@ -49,23 +44,18 @@
 
 #include "colour_button.h"
 
-
-//////////////
-// Prototypes
+namespace agi { struct Context; }
 class AssStyle;
-class SubtitlesGrid;
 class SubtitlesPreview;
 class AssStyleStorage;
 
-
-
 /// DOCME
 /// @class DialogStyleEditor
 /// @brief DOCME
 ///
 /// DOCME
 class DialogStyleEditor : public wxDialog {
-private:
+	agi::Context *c;
 
 	/// DOCME
 	bool isLocal;
@@ -81,9 +71,6 @@ private:
 	/// DOCME
 	AssStyle *work;
 
-	/// DOCME
-	SubtitlesGrid *grid;
-
 	/// DOCME
 	AssStyleStorage *store;
 
@@ -218,7 +205,7 @@ private:
 	void OnPreviewColourChange (wxCommandEvent &event);
 
 public:
-	DialogStyleEditor(wxWindow *parent,AssStyle *style,SubtitlesGrid *grid,bool local,AssStyleStorage *store,bool newStyle=false);
+	DialogStyleEditor(wxWindow *parent,AssStyle *style, agi::Context *c,bool local,AssStyleStorage *store,bool newStyle=false);
 	~DialogStyleEditor();
 
 	void Apply (bool apply,bool close);
diff --git a/aegisub/src/dialog_style_manager.cpp b/aegisub/src/dialog_style_manager.cpp
index f7fb895c1..9c75106eb 100644
--- a/aegisub/src/dialog_style_manager.cpp
+++ b/aegisub/src/dialog_style_manager.cpp
@@ -51,6 +51,7 @@
 #include "dialog_selected_choices.h"
 #include "dialog_style_editor.h"
 #include "dialog_style_manager.h"
+#include "include/aegisub/context.h"
 #include "help_button.h"
 #include "libresrc/libresrc.h"
 #include "main.h"
@@ -89,18 +90,12 @@ enum {
 	LIST_CURRENT
 };
 
-/// @brief Constructor 
-/// @param parent 
-/// @param _grid  
-DialogStyleManager::DialogStyleManager (wxWindow *parent,SubtitlesGrid *_grid)
-: wxDialog (parent,-1,_("Styles Manager"),wxDefaultPosition,wxDefaultSize,wxDEFAULT_DIALOG_STYLE,_T("DialogStylesManager"))
+DialogStyleManager::DialogStyleManager (agi::Context *context)
+: wxDialog (context->parent,-1,_("Styles Manager"),wxDefaultPosition,wxDefaultSize,wxDEFAULT_DIALOG_STYLE,_T("DialogStylesManager"))
+, c(context)
 {
-	// Set icon
 	SetIcon(BitmapToIcon(GETIMAGE(style_toolbutton_24)));
 
-	// Vars
-	grid = _grid;
-
 	// Catalog
 	wxSizer *CatalogBox = new wxStaticBoxSizer(wxHORIZONTAL,this,_("Catalog of available storages"));
 	CatalogList = new wxComboBox(this,LIST_CATALOG, _T(""), wxDefaultPosition, wxSize(-1,-1), 0, NULL, wxCB_READONLY | wxCB_READONLY, wxDefaultValidator, _T("Catalog List"));
@@ -225,18 +220,17 @@ DialogStyleManager::DialogStyleManager (wxWindow *parent,SubtitlesGrid *_grid)
 
 	// Populate lists
 	LoadCatalog();
-	LoadCurrentStyles(grid->ass);
+	LoadCurrentStyles(c->ass);
 
 	//Set key handlers for lists
-	CatalogList->PushEventHandler(new DialogStyleManagerEvent(this));
-	StorageList->PushEventHandler(new DialogStyleManagerEvent(this));
-	CurrentList->PushEventHandler(new DialogStyleManagerEvent(this));
+	CatalogList->Bind(wxEVT_KEY_DOWN, &DialogStyleManager::OnKeyDown, this);
+	StorageList->Bind(wxEVT_KEY_DOWN, &DialogStyleManager::OnKeyDown, this);
+	CurrentList->Bind(wxEVT_KEY_DOWN, &DialogStyleManager::OnKeyDown, this);
 
 	// Select default item
 	wxString selected_style;
-	if (_grid) {
-		AssDialogue *dia = _grid->GetDialogue(_grid->GetFirstSelRow());
-		if(dia) selected_style = dia->Style;
+	if (AssDialogue *dia = context->selectionController->GetActiveLine()) {
+		selected_style = dia->Style;
 	}
 
 	if (StorageList->GetCount() && StorageList->SetStringSelection(selected_style)) {
@@ -258,11 +252,8 @@ DialogStyleManager::DialogStyleManager (wxWindow *parent,SubtitlesGrid *_grid)
 DialogStyleManager::~DialogStyleManager() {
 	int sel = CatalogList->GetSelection();
 	if (sel != wxNOT_FOUND) {
-		grid->ass->SetScriptInfo(_T("Last Style Storage"),CatalogList->GetString(sel));
+		c->ass->SetScriptInfo("Last Style Storage",CatalogList->GetString(sel));
 	}
-	CatalogList->PopEventHandler(true);
-	StorageList->PopEventHandler(true);
-	CurrentList->PopEventHandler(true);
 	Store.Clear();
 }
 
@@ -299,7 +290,7 @@ void DialogStyleManager::LoadCatalog () {
 
 	// Set to default if available
 	StorageActions(false);
-	wxString pickStyle = grid->ass->GetScriptInfo(_T("Last Style Storage"));
+	wxString pickStyle = c->ass->GetScriptInfo(_T("Last Style Storage"));
 	if (pickStyle.IsEmpty()) pickStyle = _T("Default");
 	int opt = CatalogList->FindString(pickStyle, false);
 	if (opt != wxNOT_FOUND) {
@@ -492,7 +483,7 @@ void DialogStyleManager::OnStorageEdit (wxCommandEvent &) {
 	int n = StorageList->GetSelections(selections);
 	if (n == 1) {
 		AssStyle *selStyle = styleStorageMap[selections[0]];
-		DialogStyleEditor editor(this,selStyle,grid,false,&Store);
+		DialogStyleEditor editor(this,selStyle,c,false,&Store);
 		if (editor.ShowModal()) {
 			StorageList->SetString(selections[0],selStyle->name);
 			Store.Save(CatalogList->GetString(CatalogList->GetSelection()));
@@ -507,7 +498,7 @@ void DialogStyleManager::OnCurrentEdit (wxCommandEvent &) {
 	int n = CurrentList->GetSelections(selections);
 	if (n == 1) {
 		AssStyle *selStyle = styleMap[selections[0]];
-		DialogStyleEditor editor(this,selStyle,grid,true,&Store);
+		DialogStyleEditor editor(this,selStyle,c,true,&Store);
 		if (editor.ShowModal()) {
 			CurrentList->SetString(selections[0],selStyle->name);
 		}
@@ -599,15 +590,15 @@ void DialogStyleManager::OnCopyToCurrent (wxCommandEvent &) {
 		}
 		if (addStyle) {
 			AssStyle *temp = new AssStyle(*styleStorageMap.at(selections[i]));
-			grid->ass->InsertStyle(temp);
+			c->ass->InsertStyle(temp);
 			copied.push_back(styleName);
 		}
 	}
-	LoadCurrentStyles(grid->ass);
+	LoadCurrentStyles(c->ass);
 	for (list<wxString>::iterator name = copied.begin(); name != copied.end(); ++name) {
 		CurrentList->SetStringSelection(*name, true);
 	}
-	grid->ass->Commit(_("style copy"));
+	c->ass->Commit(_("style copy"));
 	wxCommandEvent dummy;
 	OnCurrentChange(dummy);
 }
@@ -623,7 +614,7 @@ void DialogStyleManager::OnStorageCopy (wxCommandEvent &) {
 	newName += temp->name;
 	temp->name = newName;
 
-	DialogStyleEditor editor(this,temp,grid,false,&Store,true);
+	DialogStyleEditor editor(this,temp,c,false,&Store,true);
 	int modified = editor.ShowModal();
 	if (modified) {
 		Store.style.push_back(temp);
@@ -646,16 +637,16 @@ void DialogStyleManager::OnCurrentCopy (wxCommandEvent &) {
 	newName += temp->name;
 	temp->name = newName;
 
-	DialogStyleEditor editor(this,temp,grid,true,&Store,true);
+	DialogStyleEditor editor(this,temp,c,true,&Store,true);
 	int modified = editor.ShowModal();
 	if (modified) {
-		grid->ass->InsertStyle(temp);
-		LoadCurrentStyles(grid->ass);
+		c->ass->InsertStyle(temp);
+		LoadCurrentStyles(c->ass);
 		CurrentList->SetStringSelection(temp->name); // but even without this, the copy/delete/copy-to-storage buttons stay enabled?
 	}
 	else delete temp;
 
-	grid->ass->Commit(_("style copy"));
+	c->ass->Commit(_("style copy"));
 	UpdateMoveButtons();
 }
 
@@ -700,14 +691,14 @@ void DialogStyleManager::PasteToCurrent() {
 		try {
 			s = new AssStyle(st.GetNextToken().Trim(true));
 			if (s->Valid) {
-				while (grid->ass->GetStyle(s->name) != NULL)
+				while (c->ass->GetStyle(s->name) != NULL)
 					s->name = _T("Copy of ") + s->name;
 
 				s->UpdateData();
-				grid->ass->InsertStyle(s);
-				LoadCurrentStyles(grid->ass);
+				c->ass->InsertStyle(s);
+				LoadCurrentStyles(c->ass);
 
-				grid->ass->Commit(_("style paste"));
+				c->ass->Commit(_("style paste"));
 			}
 			else
 				wxMessageBox(_("Could not parse style"), _("Could not parse style"), wxOK | wxICON_EXCLAMATION , this);
@@ -763,7 +754,7 @@ void DialogStyleManager::PasteToStorage() {
 void DialogStyleManager::OnStorageNew (wxCommandEvent &) {
 	AssStyle *temp = new AssStyle;
 
-	DialogStyleEditor editor(this,temp,grid,false,&Store,true);
+	DialogStyleEditor editor(this,temp,c,false,&Store,true);
 	int modified = editor.ShowModal();
 	if (modified) {
 		Store.style.push_back(temp);
@@ -779,11 +770,11 @@ void DialogStyleManager::OnStorageNew (wxCommandEvent &) {
 void DialogStyleManager::OnCurrentNew (wxCommandEvent &) {
 	AssStyle *temp = new AssStyle;
 
-	DialogStyleEditor editor(this,temp,grid,true,&Store,true);
+	DialogStyleEditor editor(this,temp,c,true,&Store,true);
 	int modified = editor.ShowModal();
 	if (modified) {
-		grid->ass->InsertStyle(temp);
-		LoadCurrentStyles(grid->ass);
+		c->ass->InsertStyle(temp);
+		LoadCurrentStyles(c->ass);
 		CurrentList->SetStringSelection(temp->name);
 	}
 	else delete temp;
@@ -841,10 +832,10 @@ void DialogStyleManager::OnCurrentDelete (wxCommandEvent &) {
 		AssStyle *temp;
 		for (int i=0;i<n;i++) {
 			temp = styleMap.at(selections[i]);
-			grid->ass->Line.remove(temp);
+			c->ass->Line.remove(temp);
 			delete temp;
 		}
-		LoadCurrentStyles(grid->ass);
+		LoadCurrentStyles(c->ass);
 
 		// Set buttons
 		MoveToStorage->Enable(false);
@@ -852,7 +843,7 @@ void DialogStyleManager::OnCurrentDelete (wxCommandEvent &) {
 		CurrentCopy->Enable(false);
 		CurrentDelete->Enable(false);
 
-		grid->ass->Commit(_("style delete"));
+		c->ass->Commit(_("style delete"));
 	}
 	UpdateMoveButtons();
 }
@@ -898,7 +889,7 @@ void DialogStyleManager::OnCurrentImport(wxCommandEvent &) {
 						// The GetString->FindString mess is a silly workaround for the fact that to vsfilter
 						// (and the duplicate check a few lines above), style names aren't case sensitive, but to the
 						// rest of Aegisub they are.
-						*(grid->ass->GetStyle(CurrentList->GetString(CurrentList->FindString(styles[selections[i]], false)))) = *temp.GetStyle(styles[selections[i]]);
+						*(c->ass->GetStyle(CurrentList->GetString(CurrentList->FindString(styles[selections[i]], false)))) = *temp.GetStyle(styles[selections[i]]);
 					}
 					continue;
 				}
@@ -907,13 +898,13 @@ void DialogStyleManager::OnCurrentImport(wxCommandEvent &) {
 				modified = true;
 				AssStyle *tempStyle = new AssStyle;
 				*tempStyle = *temp.GetStyle(styles[selections[i]]);
-				grid->ass->InsertStyle(tempStyle);
+				c->ass->InsertStyle(tempStyle);
 			}
 
 			// Update
 			if (modified) {
-				LoadCurrentStyles(grid->ass);
-				grid->ass->Commit(_("style import"));
+				LoadCurrentStyles(c->ass);
+				c->ass->Commit(_("style import"));
 			}
 		}
 		catch (...) {
@@ -990,8 +981,6 @@ void DialogStyleManager::OnCurrentSort (wxCommandEvent &) { MoveStyles(false,4);
 /// @param storage 
 /// @param type    
 void DialogStyleManager::MoveStyles(bool storage, int type) {
-	// Variables
-	AssFile *subs = grid->ass;
 	wxListBox *list;
 	if (storage) list = StorageList;
 	else list = CurrentList;
@@ -1097,19 +1086,19 @@ void DialogStyleManager::MoveStyles(bool storage, int type) {
 		// Replace styles
 		entryIter next;
 		int curn = 0;
-		for (entryIter cur=subs->Line.begin();cur!=subs->Line.end();cur = next) {
+		for (entryIter cur=c->ass->Line.begin();cur!=c->ass->Line.end();cur = next) {
 			next = cur;
 			next++;
 			AssStyle *style = dynamic_cast<AssStyle*>(*cur);
 			if (style) {
-				subs->Line.insert(cur,styls[curn]);
-				subs->Line.erase(cur);
+				c->ass->Line.insert(cur,styls[curn]);
+				c->ass->Line.erase(cur);
 				curn++;
 			}
 		}
 
 		// Flag as modified
-		grid->ass->Commit(_("style move"));
+		c->ass->Commit(_("style move"));
 	}
 
 	// Update
@@ -1183,16 +1172,3 @@ int DialogStyleManager::lastx = -1;
 
 /// DOCME
 int DialogStyleManager::lasty = -1;
-
-/// @brief DialogStyleManagerEvent stuff 
-/// @param ctrl 
-DialogStyleManagerEvent::DialogStyleManagerEvent(DialogStyleManager *ctrl) {
-	control = ctrl;
-}
-BEGIN_EVENT_TABLE(DialogStyleManagerEvent, wxEvtHandler)
-	EVT_KEY_DOWN(DialogStyleManagerEvent::OnKeyDown)
-END_EVENT_TABLE()
-
-void DialogStyleManagerEvent::OnKeyDown(wxKeyEvent &event) {
-	control->OnKeyDown(event); //we need to access controls, so rather than make the controls public...
-}
diff --git a/aegisub/src/dialog_style_manager.h b/aegisub/src/dialog_style_manager.h
index 121c03992..3182262b8 100644
--- a/aegisub/src/dialog_style_manager.h
+++ b/aegisub/src/dialog_style_manager.h
@@ -50,9 +50,7 @@
 
 #include "ass_style_storage.h"
 
-
-//////////////
-// Prototypes
+namespace agi { struct Context; }
 class AssFile;
 class AssStyle;
 class SubtitlesGrid;
@@ -65,7 +63,7 @@ class SubtitlesGrid;
 ///
 /// DOCME
 class DialogStyleManager : public wxDialog {
-private:
+	agi::Context *c;
 
 	/// DOCME
 	std::vector<AssStyle*> styleMap;
@@ -73,11 +71,6 @@ private:
 	/// DOCME
 	std::vector<AssStyle*> styleStorageMap;
 
-
-	/// DOCME
-	SubtitlesGrid *grid;
-
-
 	/// DOCME
 	wxComboBox *CatalogList;
 
@@ -164,14 +157,9 @@ private:
 	/// DOCME
 	static int lastx, lasty;
 
-public:
-
 	/// DOCME
 	wxSizer *MainSizer;
 
-	DialogStyleManager(wxWindow *parent,SubtitlesGrid *grid);
-	~DialogStyleManager();
-
 	void OnClose (wxCommandEvent &event);
 	void OnChangeCatalog (wxCommandEvent &event);
 	void OnCatalogNew (wxCommandEvent &event);
@@ -204,23 +192,10 @@ public:
 	void PasteToCurrent();
 	void PasteToStorage();
 
-
-	DECLARE_EVENT_TABLE()
-};
-
-/// DOCME
-/// @class DialogStyleManagerEvent
-/// @brief DOCME
-///
-/// DOCME
-class DialogStyleManagerEvent : public wxEvtHandler {
-private:
-
-	/// DOCME
-	DialogStyleManager *control;
-	void OnKeyDown(wxKeyEvent &event);
-
 public:
-	DialogStyleManagerEvent(DialogStyleManager *control);
+
+	DialogStyleManager(agi::Context *context);
+	~DialogStyleManager();
+
 	DECLARE_EVENT_TABLE()
 };
diff --git a/aegisub/src/dialog_styling_assistant.cpp b/aegisub/src/dialog_styling_assistant.cpp
index 23ef173cd..0ccd1fca8 100644
--- a/aegisub/src/dialog_styling_assistant.cpp
+++ b/aegisub/src/dialog_styling_assistant.cpp
@@ -62,6 +62,14 @@
 #include "video_context.h"
 #include "video_display.h"
 
+// IDs
+enum {
+	ENTER_STYLE_BOX,
+	STYLE_LIST,
+	BUTTON_PLAY_VIDEO,
+	BUTTON_PLAY_AUDIO
+};
+
 
 /// @brief Constructor 
 /// @param parent 
@@ -69,24 +77,20 @@
 ///
 DialogStyling::DialogStyling(agi::Context *context)
 : wxDialog(context->parent, -1, _("Styling assistant"), wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE | wxRESIZE_BORDER | wxMINIMIZE_BOX)
+, c(context)
+, needCommit(false)
+, linen(-1)
 {
 	// Set icon
 	SetIcon(BitmapToIcon(GETIMAGE(styling_toolbutton_24)));
 
-	// Variables
-	grid = context->subsGrid;
-	audio = context->audioController;
-	video = context->videoController;
-	needCommit = false;
-	linen = -1;
-
 	// Top sizer
 	wxSizer *TopSizer = new wxStaticBoxSizer(wxHORIZONTAL,this,_("Current line"));
 	CurLine = new wxTextCtrl(this,-1,_("Current line"),wxDefaultPosition,wxSize(300,60),wxTE_MULTILINE | wxTE_READONLY);
 	TopSizer->Add(CurLine,1,wxEXPAND,0);
 
 	// Left sizer
-	Styles = new wxListBox(this,STYLE_LIST,wxDefaultPosition,wxSize(150,180),grid->ass->GetStyles());
+	Styles = new wxListBox(this,STYLE_LIST,wxDefaultPosition,wxSize(150,180),context->ass->GetStyles());
 	wxSizer *LeftSizer = new wxStaticBoxSizer(wxVERTICAL,this,_("Styles available"));
 	LeftSizer->Add(Styles,1,wxEXPAND,0);
 
@@ -99,7 +103,6 @@ DialogStyling::DialogStyling(agi::Context *context)
 	RightTop->Add(TypeBox,1,wxEXPAND);
 
 	// Shortcuts
-	//wxStaticText *Keys = new wxStaticText(this,-1,_("Enter:\t\tAccept changes\nPage up:\tPrevious line\nPage down:\tNext line\nEnd:\t\tPlay sound\nClick on list:\tSet style\nCtrl+enter:\tAccept without going to next"));
 	wxSizer *KeysInnerSizer = new wxGridSizer(2,0,5);
 //H	KeysInnerSizer->Add(new wxStaticText(this,-1,Hotkeys.GetText(_T("Styling Assistant Accept")) + _T(": ")));
 	KeysInnerSizer->Add(new wxStaticText(this,-1,_("Accept changes")));
@@ -165,29 +168,24 @@ DialogStyling::DialogStyling(agi::Context *context)
 	origColour = TypeBox->GetBackgroundColour();
 }
 
-
-
 /// @brief Destructor 
 ///
 DialogStyling::~DialogStyling () {
 	GetPosition(&lastx, &lasty);
 	if (needCommit) {
-		grid->ass->Commit(_("style changes"), AssFile::COMMIT_TEXT);
+		c->ass->Commit(_("style changes"), AssFile::COMMIT_TEXT);
 	}
 }
 
-
-
 /// @brief Jump to line 
 /// @param n 
 /// @return 
 ///
 void DialogStyling::JumpToLine(int n) {
-	// Check stuff
 	if (n == -1) return;
 
 	// Get line
-	AssDialogue *nextLine = grid->GetDialogue(n);
+	AssDialogue *nextLine = c->subsGrid->GetDialogue(n);
 	if (!nextLine) return;
 	line = nextLine;
 
@@ -210,33 +208,29 @@ void DialogStyling::JumpToLine(int n) {
 	TypeBox->SetSelection(0,TypeBox->GetValue().Length());
 
 	// Update grid
-	grid->SelectRow(linen,false);
-	grid->MakeCellVisible(linen,0);
-	grid->SetActiveLine(grid->GetDialogue(linen));
+	c->subsGrid->SelectRow(linen,false);
+	c->subsGrid->MakeCellVisible(linen,0);
+	c->subsGrid->SetActiveLine(line);
 
 	// Update display
-	if (PreviewCheck->IsChecked()) VideoContext::Get()->JumpToTime(line->Start.GetMS());
+	if (PreviewCheck->IsChecked()) c->videoController->JumpToTime(line->Start.GetMS());
 }
 
-
-
 /// @brief Set style of current line 
 /// @param curName 
 /// @param jump    
 ///
 void DialogStyling::SetStyle (wxString curName, bool jump) {
-	// Get line
-	AssDialogue *line = grid->GetDialogue(linen);
-
-	// Update line
+	AssDialogue *line = c->subsGrid->GetDialogue(linen);
 	line->Style = curName;
 
 	// Update grid/subs
-	grid->Refresh(false);
 	if (PreviewCheck->IsChecked()) {
-		grid->ass->Commit(_("styling assistant"), AssFile::COMMIT_TEXT);
+		c->ass->Commit(_("styling assistant"), AssFile::COMMIT_TEXT);
+	}
+	else {
+		needCommit = true;
 	}
-	else needCommit = true;
 
 	// Next line
 	if (jump) JumpToLine(linen+1);
@@ -265,19 +259,18 @@ void DialogStyling::OnActivate(wxActivateEvent &event) {
 	// Dialog lost focus
 	if (!event.GetActive()) {
 		if (needCommit) {
-			grid->ass->Commit(_("styling assistant"), AssFile::COMMIT_TEXT);
+			c->ass->Commit(_("styling assistant"), AssFile::COMMIT_TEXT);
 			needCommit = false;
 		}
 		return;
 	}
 	// Enable/disable play video/audio buttons
-	PlayVideoButton->Enable(video->IsLoaded());
-	/// @todo Reinstate this when the audio controller is made reachable from here
-	//PlayAudioButton->Enable(audio->loaded);
+	PlayVideoButton->Enable(c->videoController->IsLoaded());
+	PlayAudioButton->Enable(c->audioController->IsAudioOpen());
 	// Fix style list
-	Styles->Set(grid->ass->GetStyles());
+	Styles->Set(c->ass->GetStyles());
 	// Fix line selection
-	JumpToLine(grid->GetFirstSelRow());
+	JumpToLine(c->subsGrid->GetFirstSelRow());
 }
 
 
@@ -372,7 +365,7 @@ void DialogStyling::OnListClicked(wxCommandEvent &event) {
 /// @param event 
 ///
 void DialogStyling::OnPlayVideoButton(wxCommandEvent &event) {
-	video->PlayLine();
+	c->videoController->PlayLine();
 	TypeBox->SetFocus();
 }
 
@@ -381,9 +374,9 @@ void DialogStyling::OnPlayVideoButton(wxCommandEvent &event) {
 /// @param event 
 ///
 void DialogStyling::OnPlayAudioButton(wxCommandEvent &event) {
-	audio->PlayRange(SampleRange(
-		audio->SamplesFromMilliseconds(line->Start.GetMS()),
-		audio->SamplesFromMilliseconds(line->End.GetMS())));
+	c->audioController->PlayRange(SampleRange(
+		c->audioController->SamplesFromMilliseconds(line->Start.GetMS()),
+		c->audioController->SamplesFromMilliseconds(line->End.GetMS())));
 	TypeBox->SetFocus();
 }
 
@@ -393,12 +386,11 @@ void DialogStyling::OnPlayAudioButton(wxCommandEvent &event) {
 /// @param parent 
 ///
 StyleEditBox::StyleEditBox(DialogStyling *parent)
-: wxTextCtrl(parent,ENTER_STYLE_BOX,_T(""),wxDefaultPosition,wxSize(180,-1),wxTE_PROCESS_ENTER)
+: wxTextCtrl(parent,ENTER_STYLE_BOX,"",wxDefaultPosition,wxSize(180,-1),wxTE_PROCESS_ENTER)
+, diag(parent)
 {
-	diag = parent;
 }
 
-
 ////////////////////////////
 // Event table for edit box
 BEGIN_EVENT_TABLE(StyleEditBox,wxTextCtrl)
@@ -499,5 +491,3 @@ int DialogStyling::lastx = -1;
 
 /// DOCME
 int DialogStyling::lasty = -1;
-
-
diff --git a/aegisub/src/dialog_styling_assistant.h b/aegisub/src/dialog_styling_assistant.h
index a08671ab2..b6c0eb387 100644
--- a/aegisub/src/dialog_styling_assistant.h
+++ b/aegisub/src/dialog_styling_assistant.h
@@ -34,11 +34,6 @@
 /// @ingroup tools_ui
 ///
 
-#pragma once
-
-
-///////////
-// Headers
 #ifndef AGI_PRE
 #include <wx/checkbox.h>
 #include <wx/colour.h>
@@ -61,8 +56,6 @@ class VideoContext;
 ///
 /// DOCME
 class StyleEditBox : public wxTextCtrl {
-private:
-
 	/// DOCME
 	DialogStyling *diag;
 	void OnKeyDown(wxKeyEvent &event);
@@ -83,10 +76,7 @@ public:
 class DialogStyling : public wxDialog {
 	friend class StyleEditBox;
 
-private:
-
-	/// DOCME
-	SubtitlesGrid *grid;
+	agi::Context *c;
 
 	/// DOCME
 	wxColour origColour;
@@ -130,19 +120,12 @@ private:
 	static int lastx, lasty;
 
 public:
-
 	/// DOCME
 	int linen;
 
 	/// DOCME
 	AssDialogue *line;
 
-	/// DOCME
-	AudioController *audio;
-
-	/// DOCME
-	VideoContext *video;
-
 	DialogStyling(agi::Context *context);
 	~DialogStyling ();
 
@@ -150,21 +133,3 @@ public:
 
 	DECLARE_EVENT_TABLE()
 };
-
-
-///////
-// IDs
-enum {
-
-	/// DOCME
-	ENTER_STYLE_BOX,
-
-	/// DOCME
-	STYLE_LIST,
-
-	/// DOCME
-	BUTTON_PLAY_VIDEO,
-
-	/// DOCME
-	BUTTON_PLAY_AUDIO
-};
diff --git a/aegisub/src/dialog_timing_processor.cpp b/aegisub/src/dialog_timing_processor.cpp
index ae5a1b9a3..a8d71b711 100644
--- a/aegisub/src/dialog_timing_processor.cpp
+++ b/aegisub/src/dialog_timing_processor.cpp
@@ -36,11 +36,16 @@
 
 #include "config.h"
 
+#ifndef AGI_PRE
+#include <algorithm>
+#endif
+
 #include "ass_dialogue.h"
 #include "ass_file.h"
 #include "ass_time.h"
 #include "dialog_timing_processor.h"
 #include "help_button.h"
+#include "include/aegisub/context.h"
 #include "libresrc/libresrc.h"
 #include "main.h"
 #include "selection_controller.h"
@@ -62,28 +67,24 @@ enum {
 	TIMING_STYLE_LIST
 };
 
-/// @brief Constructor 
-/// @param parent 
-/// @param _grid  
-///
-DialogTimingProcessor::DialogTimingProcessor(wxWindow *parent,SubtitlesGrid *_grid)
-: wxDialog(parent,-1,_("Timing Post-Processor"),wxDefaultPosition,wxSize(400,250),wxDEFAULT_DIALOG_STYLE)
+DialogTimingProcessor::DialogTimingProcessor(agi::Context *c)
+: wxDialog(c->parent,-1,_("Timing Post-Processor"),wxDefaultPosition,wxSize(400,250),wxDEFAULT_DIALOG_STYLE)
+, c(c)
+, leadInTime(wxString::Format("%d", OPT_GET("Audio/Lead/IN")->GetInt()))
+, leadOutTime(wxString::Format("%d", OPT_GET("Audio/Lead/OUT")->GetInt()))
+, thresStartBefore(wxString::Format("%d", OPT_GET("Tool/Timing Post Processor/Threshold/Key Start Before")->GetInt()))
+, thresStartAfter(wxString::Format("%d", OPT_GET("Tool/Timing Post Processor/Threshold/Key Start After")->GetInt()))
+, thresEndBefore(wxString::Format("%d", OPT_GET("Tool/Timing Post Processor/Threshold/Key End Before")->GetInt()))
+, thresEndAfter(wxString::Format("%d", OPT_GET("Tool/Timing Post Processor/Threshold/Key End After")->GetInt()))
+, adjsThresTime(wxString::Format("%d", OPT_GET("Tool/Timing Post Processor/Threshold/Adjacent")->GetInt()))
 {
 	SetIcon(BitmapToIcon(GETIMAGE(timing_processor_toolbutton_24)));
 
 	// Set variables
-	grid = _grid;
-	leadInTime = AegiIntegerToString(OPT_GET("Audio/Lead/IN")->GetInt());
-	leadOutTime = AegiIntegerToString(OPT_GET("Audio/Lead/OUT")->GetInt());
-	thresStartBefore = AegiIntegerToString(OPT_GET("Tool/Timing Post Processor/Threshold/Key Start Before")->GetInt());
-	thresStartAfter = AegiIntegerToString(OPT_GET("Tool/Timing Post Processor/Threshold/Key Start After")->GetInt());
-	thresEndBefore = AegiIntegerToString(OPT_GET("Tool/Timing Post Processor/Threshold/Key End Before")->GetInt());
-	thresEndAfter = AegiIntegerToString(OPT_GET("Tool/Timing Post Processor/Threshold/Key End After")->GetInt());
-	adjsThresTime = AegiIntegerToString(OPT_GET("Tool/Timing Post Processor/Threshold/Adjacent")->GetInt());
 
 	// Styles box
 	wxSizer *LeftSizer = new wxStaticBoxSizer(wxVERTICAL,this,_("Apply to styles"));
-	wxArrayString styles = grid->ass->GetStyles();
+	wxArrayString styles = c->ass->GetStyles();
 	StyleList = new wxCheckListBox(this,TIMING_STYLE_LIST,wxDefaultPosition,wxSize(150,150),styles);
 	StyleList->SetToolTip(_("Select styles to process. Unchecked ones will be ignored."));
 	wxButton *all = new wxButton(this,BUTTON_SELECT_ALL,_("All"));
@@ -295,87 +296,57 @@ void DialogTimingProcessor::OnApply(wxCommandEvent &) {
 	OPT_SET("Tool/Timing Post Processor/Only Selection")->SetBool(onlySelection->IsChecked());
 
 	// Check if rows are valid
-	bool valid = true;
-	AssDialogue *tempDiag;
-	int i = 0;
-	for (std::list<AssEntry*>::iterator cur=grid->ass->Line.begin();cur!=grid->ass->Line.end();cur++) {
-		tempDiag = dynamic_cast<AssDialogue*>(*cur);
-		if (tempDiag) {
-			i++;
+	for (entryIter cur = c->ass->Line.begin(); cur != c->ass->Line.end(); ++cur) {
+		if (AssDialogue *tempDiag = dynamic_cast<AssDialogue*>(*cur)) {
 			if (tempDiag->Start.GetMS() > tempDiag->End.GetMS()) {
-				valid = false;
-				break;
+				wxMessageBox(
+					wxString::Format(
+						_("One of the lines in the file (%i) has negative duration. Aborting."),
+						std::distance(c->ass->Line.begin(), cur)),
+					_("Invalid script"),
+					wxICON_ERROR|wxOK);
+				EndModal(0);
+				return;
 			}
 		}
 	}
 
-	if (valid) Process();
-	else wxMessageBox(wxString::Format(_("One of the lines in the file (%i) has negative duration. Aborting."),i),_("Invalid script"),wxICON_ERROR|wxOK);
-
+	Process();
 	EndModal(0);
 }
 
 int DialogTimingProcessor::GetClosestKeyFrame(int frame) {
-	// Linear dumb search, not very efficient, but it doesn't really matter
-	int closest = 0;
-	size_t n = KeyFrames.size();
-	for (size_t i=0;i<n;i++) {
-		if (abs(KeyFrames[i]-frame) < abs(closest-frame)) {
-			closest = KeyFrames[i];
-		}
-	}
-	return closest;
+	std::vector<int>::iterator pos = lower_bound(KeyFrames.begin(), KeyFrames.end(), frame);
+	if (distance(pos, KeyFrames.end()) < 2) return KeyFrames.back();
+	return frame - *pos < *(pos + 1) - frame ? *pos : *(pos + 1);
 }
 
-/// @brief Check if style is listed 
-/// @param styleName 
-/// @return 
-///
-bool DialogTimingProcessor::StyleOK(wxString styleName) {
-	size_t len = StyleList->GetCount();
-	for (size_t i=0;i<len;i++) {
-		if (StyleList->GetString(i) == styleName && StyleList->IsChecked(i)) return true;
-	}
-	return false;
+static bool bad_line(std::set<wxString> *styles, AssDialogue *d) {
+	return !d || d->Comment || styles->find(d->Style) == styles->end();
 }
 
-/// @brief Sort dialogues
-///
 void DialogTimingProcessor::SortDialogues() {
-	// Copy from original to temporary list
-	std::list<AssDialogue*> temp;
-	AssDialogue *tempDiag;
-	int count = grid->GetRows();
-	for (int i=0;i<count;i++) {
-		tempDiag = grid->GetDialogue(i);
-		if (tempDiag && StyleOK(tempDiag->Style) && !tempDiag->Comment) {
-			if (!onlySelection->IsChecked() || grid->IsInSelection(i)) {
-				temp.push_back(tempDiag);
-			}
+	std::set<wxString> styles;
+	for (size_t i = 0; i < StyleList->GetCount(); ++i) {
+		if (StyleList->IsChecked(i)) {
+			styles.insert(StyleList->GetString(i));
 		}
 	}
 
-	// Sort temporary list
-	AssFile::Sort(temp);
-
-	// Copy temporary list to final vector
 	Sorted.clear();
-	for (std::list<AssDialogue*>::iterator cur=temp.begin();cur!=temp.end();cur++) {
-		Sorted.push_back(*cur);
+	Sorted.reserve(c->ass->Line.size());
+	if (onlySelection->IsChecked()) {
+		SelectionController<AssDialogue>::Selection sel = c->selectionController->GetSelectedSet();
+		remove_copy_if(sel.begin(), sel.end(), back_inserter(Sorted),
+			bind(bad_line, &styles, std::tr1::placeholders::_1));
 	}
-}
-
-/// @brief Gets sorted dialogue 
-/// @param n 
-/// @return 
-///
-AssDialogue *DialogTimingProcessor::GetSortedDialogue(int n) {
-	try {
-		return Sorted.at(n);
-	}
-	catch (...) {
-		return NULL;
+	else {
+		std::vector<AssDialogue*> tmp(c->ass->Line.size());
+		transform(c->ass->Line.begin(), c->ass->Line.end(), back_inserter(tmp), cast<AssDialogue*>());
+		remove_copy_if(tmp.begin(), tmp.end(), back_inserter(Sorted),
+			bind(bad_line, &styles, std::tr1::placeholders::_1));
 	}
+	sort(Sorted.begin(), Sorted.end(), AssFile::CompStart);
 }
 
 /// @brief Actually process subtitles 
@@ -394,121 +365,75 @@ void DialogTimingProcessor::Process() {
 
 	// Add lead-in/out
 	if (addIn || addOut) {
-		// Variables
-		AssDialogue *cur;
-		AssDialogue *comp;
-		int start,end;
-		int startLead,endLead;
-		int compStart,compEnd;
-
-		// For each row
 		for (int i=0;i<rows;i++) {
-			// Get line and check if it's OK
-			cur = GetSortedDialogue(i);
-
-			// Set variables
-			start = cur->Start.GetMS();
-			end = cur->End.GetMS();
-			if (addIn) startLead = start - inVal;
-			else startLead = start;
-			if (addOut) endLead = end + outVal;
-			else endLead = end;
+			AssDialogue *cur = Sorted[i];
 
 			// Compare to every previous line (yay for O(n^2)!) to see if it's OK to add lead-in
-			if (addIn) {
+			if (inVal) {
+				int startLead = cur->Start.GetMS() - inVal;
 				for (int j=0;j<i;j++) {
-					comp = GetSortedDialogue(j);
+					AssDialogue *comp = Sorted[j];
 
 					// Check if they don't already collide (ignore it in that case)
 					if (cur->CollidesWith(comp)) continue;
 
 					// Get comparison times
-					compEnd = comp->End.GetMS();
-
-					// Limit lead-in if needed
-					if (compEnd > startLead) startLead = compEnd;
+					startLead = std::max(startLead, comp->End.GetMS());
 				}
+				cur->Start.SetMS(startLead);
 			}
 
 			// Compare to every line to see how far can lead-out be extended
-			if (addOut) {
+			if (outVal) {
+				int endLead = cur->End.GetMS() + outVal;
 				for (int j=i+1;j<rows;j++) {
-					comp = GetSortedDialogue(j);
+					AssDialogue *comp = Sorted[j];
 
 					// Check if they don't already collide (ignore it in that case)
 					if (cur->CollidesWith(comp)) continue;
 
 					// Get comparison times
-					compStart = comp->Start.GetMS();
-
-					// Limit lead-in if needed
-					if (compStart < endLead) endLead = compStart;
+					endLead = std::min(endLead, comp->Start.GetMS());
 				}
+				cur->End.SetMS(endLead);
 			}
-
-			// Set times
-			cur->Start.SetMS(startLead);
-			cur->End.SetMS(endLead);
 		}
 	}
 
 	// Make adjacent
 	if (adjsEnable->IsChecked()) {
-		// Variables
-		AssDialogue *cur;
-		AssDialogue *prev = NULL;
-		int curStart,prevEnd;
+		AssDialogue *prev = Sorted.front();
+		
 		long adjsThres = 0;
-		int dist;
-
-		// Get threshold
 		adjacentThres->GetValue().ToLong(&adjsThres);
 
-		// Get bias
 		float bias = adjacentBias->GetValue() / 100.0;
 
-		// For each row
-		for (int i=0;i<rows;i++) {
-			// Get line and check if it's OK
-			cur = GetSortedDialogue(i);
-
-			// Check if previous is OK
-			if (!prev) {
-				prev = cur;
-				continue;
-			}
+		for (int i=1; i < rows;i++) {
+			AssDialogue *cur = Sorted[i];
 
 			// Check if they don't collide
 			if (cur->CollidesWith(prev)) continue;
 
 			// Compare distance
-			curStart = cur->Start.GetMS();
-			prevEnd = prev->End.GetMS();
-			dist = curStart-prevEnd;
+			int curStart = cur->Start.GetMS();
+			int prevEnd = prev->End.GetMS();
+			int dist = curStart-prevEnd;
 			if (dist > 0 && dist < adjsThres) {
 				int setPos = prevEnd+int(dist*bias);
 				cur->Start.SetMS(setPos);
 				prev->End.SetMS(setPos);
 			}
 
-			// Set previous
 			prev = cur;
 		}
 	}
 
 	// Keyframe snapping
 	if (keysEnable->IsChecked()) {
-		// Get keyframes
-		VideoContext *con = VideoContext::Get();
-		KeyFrames = con->GetKeyFrames();
-		KeyFrames.push_back(con->GetLength()-1);
+		KeyFrames = c->videoController->GetKeyFrames();
+		KeyFrames.push_back(c->videoController->GetLength() - 1);
 
-		// Variables
-		int startF,endF;
-		int closest;
-		AssDialogue *cur;
-
-		// Get variables
 		long beforeStart = 0;
 		long afterStart = 0;
 		long beforeEnd = 0;
@@ -518,29 +443,27 @@ void DialogTimingProcessor::Process() {
 		keysEndBefore->GetValue().ToLong(&beforeEnd);
 		keysEndAfter->GetValue().ToLong(&afterEnd);
 		
-		// For each row
 		for (int i=0;i<rows;i++) {
-			// Get line and check if it's OK
-			cur = GetSortedDialogue(i);
+			AssDialogue *cur = Sorted[i];
 
 			// Get start/end frames
-			startF = con->FrameAtTime(cur->Start.GetMS(),agi::vfr::START);
-			endF = con->FrameAtTime(cur->End.GetMS(),agi::vfr::END);
+			int startF = c->videoController->FrameAtTime(cur->Start.GetMS(),agi::vfr::START);
+			int endF = c->videoController->FrameAtTime(cur->End.GetMS(),agi::vfr::END);
 
 			// Get closest for start
-			closest = GetClosestKeyFrame(startF);
+			int closest = GetClosestKeyFrame(startF);
 			if ((closest > startF && closest-startF <= beforeStart) || (closest < startF && startF-closest <= afterStart)) {
-				cur->Start.SetMS(con->TimeAtFrame(closest,agi::vfr::START));
+				cur->Start.SetMS(c->videoController->TimeAtFrame(closest,agi::vfr::START));
 			}
 
 			// Get closest for end
 			closest = GetClosestKeyFrame(endF)-1;
 			if ((closest > endF && closest-endF <= beforeEnd) || (closest < endF && endF-closest <= afterEnd)) {
-				cur->End.SetMS(con->TimeAtFrame(closest,agi::vfr::END));
+				cur->End.SetMS(c->videoController->TimeAtFrame(closest,agi::vfr::END));
 			}
 		}
 	}
 
 	// Update grid
-	grid->ass->Commit(_("timing processor"), AssFile::COMMIT_TIMES);
+	c->ass->Commit(_("timing processor"), AssFile::COMMIT_TIMES);
 }
diff --git a/aegisub/src/dialog_timing_processor.h b/aegisub/src/dialog_timing_processor.h
index 08aff2bb8..d12492385 100644
--- a/aegisub/src/dialog_timing_processor.h
+++ b/aegisub/src/dialog_timing_processor.h
@@ -46,8 +46,9 @@
 #include <wx/textctrl.h>
 #endif
 
-class SubtitlesGrid;
+namespace agi { struct Context; }
 class AssDialogue;
+class SubtitlesGrid;
 
 /// DOCME
 /// @class DialogTimingProcessor
@@ -55,8 +56,7 @@ class AssDialogue;
 ///
 /// DOCME
 class DialogTimingProcessor : public wxDialog {
-	/// DOCME
-	SubtitlesGrid *grid;
+	agi::Context *c;
 
 	/// DOCME
 	wxStaticBoxSizer *KeyframesSizer;
@@ -132,15 +132,13 @@ class DialogTimingProcessor : public wxDialog {
 	void UpdateControls();
 	void Process();
 	int GetClosestKeyFrame(int frame);
-	bool StyleOK(wxString styleName);
 
 	/// DOCME
 	std::vector<AssDialogue*> Sorted;
-	AssDialogue *GetSortedDialogue(int n);
 	void SortDialogues();
 
 public:
-	DialogTimingProcessor(wxWindow *parent,SubtitlesGrid *grid);
+	DialogTimingProcessor(agi::Context *c);
 
 	DECLARE_EVENT_TABLE()
 };
diff --git a/aegisub/src/frame_main.cpp b/aegisub/src/frame_main.cpp
index 49128a4a1..f9efcbbcc 100644
--- a/aegisub/src/frame_main.cpp
+++ b/aegisub/src/frame_main.cpp
@@ -297,10 +297,10 @@ void FrameMain::InitContents() {
 	videoSizer->AddStretchSpacer(1);
 
 	StartupLog("Create subtitles grid");
-	context->subsGrid = SubsGrid = new SubtitlesGrid(this,Panel,-1,context->ass,wxDefaultPosition,wxSize(600,100),wxWANTS_CHARS | wxSUNKEN_BORDER,"Subs grid");
+	context->subsGrid = SubsGrid = new SubtitlesGrid(Panel,context.get(),wxSize(600,100),wxWANTS_CHARS | wxSUNKEN_BORDER,"Subs grid");
 	context->selectionController = context->subsGrid;
 	context->videoBox->videoSlider->grid = SubsGrid;
-	Search.grid = SubsGrid;
+	Search.context = context.get();
 
 	StartupLog("Create tool area splitter window");
 	audioSash = new wxSashWindow(Panel, ID_SASH_MAIN_AUDIO, wxDefaultPosition, wxDefaultSize, wxSW_3D|wxCLIP_CHILDREN);
@@ -316,7 +316,7 @@ void FrameMain::InitContents() {
 	audioSash->SetMinimumSizeY(audioBox->GetSize().GetHeight());
 
 	StartupLog("Create subtitle editing box");
-	context->editBox = EditBox = new SubsEditBox(Panel, SubsGrid);
+	context->editBox = EditBox = new SubsEditBox(Panel, context.get());
 
 	StartupLog("Arrange main sizers");
 	ToolsSizer = new wxBoxSizer(wxVERTICAL);
@@ -1085,7 +1085,7 @@ int FrameMain::AddMacroMenuItems(wxMenu *menu, const std::vector<Automation4::Fe
 	int id = activeMacroItems.size();;
 	for (std::vector<Automation4::FeatureMacro*>::const_iterator i = macros.begin(); i != macros.end(); ++i) {
 		wxMenuItem * m = menu->Append(ID_MENU_AUTOMATION_MACRO + id, (*i)->GetName(), (*i)->GetDescription());
-		m->Enable((*i)->Validate(SubsGrid->ass, SubsGrid->GetAbsoluteSelection(), SubsGrid->GetFirstSelRow()));
+		m->Enable((*i)->Validate(context->ass, SubsGrid->GetAbsoluteSelection(), SubsGrid->GetFirstSelRow()));
 		activeMacroItems.push_back(*i);
 		id++;
 	}
@@ -1105,7 +1105,7 @@ void FrameMain::OnAutomationMacro (wxCommandEvent &event) {
 	std::vector<int> selected_lines = SubsGrid->GetAbsoluteSelection();
 	int first_sel = SubsGrid->GetFirstSelRow();
 	// Run the macro...
-	activeMacroItems[event.GetId()-ID_MENU_AUTOMATION_MACRO]->Process(SubsGrid->ass, selected_lines, first_sel, this);
+	activeMacroItems[event.GetId()-ID_MENU_AUTOMATION_MACRO]->Process(context->ass, selected_lines, first_sel, this);
 	SubsGrid->SetSelectionFromAbsolute(selected_lines);
 	SubsGrid->EndBatch();
 #endif
diff --git a/aegisub/src/subs_edit_box.cpp b/aegisub/src/subs_edit_box.cpp
index d07bc8933..12ca37aff 100644
--- a/aegisub/src/subs_edit_box.cpp
+++ b/aegisub/src/subs_edit_box.cpp
@@ -63,7 +63,7 @@
 #include "audio_controller.h"
 #include "dialog_colorpicker.h"
 #include "dialog_search_replace.h"
-#include "frame_main.h"
+#include "include/aegisub/context.h"
 #include "libresrc/libresrc.h"
 #include "main.h"
 #include "selection_controller.h"
@@ -162,15 +162,13 @@ void bind_focus_handler(T *control, Event event, wxString value, wxString alt, w
 	control->Bind(event, handler);
 }
 
-SubsEditBox::SubsEditBox(wxWindow *parent, SubtitlesGrid *grid)
+SubsEditBox::SubsEditBox(wxWindow *parent, agi::Context *context)
 : wxPanel(parent, -1, wxDefaultPosition, wxDefaultSize, wxTAB_TRAVERSAL | wxRAISED_BORDER, "SubsEditBox")
 , line(NULL)
 , splitLineMode(false)
 , controlState(true)
-, grid(grid)
+, c(context)
 {
-	grid->editBox = this;
-
 	// Top controls
 	wxArrayString styles;
 	styles.Add(_T("Default"));
@@ -261,7 +259,7 @@ SubsEditBox::SubsEditBox(wxWindow *parent, SubtitlesGrid *grid)
 	MiddleBotSizer->Add(ByFrame,0,wxRIGHT | wxALIGN_CENTER | wxEXPAND,5);
 
 	// Text editor
-	TextEdit = new SubsTextEditCtrl(this, wxSize(300,50), wxBORDER_SUNKEN, grid);
+	TextEdit = new SubsTextEditCtrl(this, wxSize(300,50), wxBORDER_SUNKEN, c->subsGrid);
 	TextEdit->Bind(wxEVT_KEY_DOWN, &SubsEditBox::OnKeyDown, this);
 	TextEdit->SetUndoCollection(false);
 	BottomSizer = new wxBoxSizer(wxHORIZONTAL);
@@ -331,12 +329,12 @@ SubsEditBox::SubsEditBox(wxWindow *parent, SubtitlesGrid *grid)
 	wxSizeEvent evt;
 	OnSize(evt);
 
-	grid->AddSelectionListener(this);
-	grid->ass->AddCommitListener(&SubsEditBox::Update, this);
-	VideoContext::Get()->AddTimecodesListener(&SubsEditBox::UpdateFrameTiming, this);
+	c->subsGrid->AddSelectionListener(this);
+	c->ass->AddCommitListener(&SubsEditBox::Update, this);
+	context->videoController->AddTimecodesListener(&SubsEditBox::UpdateFrameTiming, this);
 }
 SubsEditBox::~SubsEditBox() {
-	grid->RemoveSelectionListener(this);
+	c->subsGrid->RemoveSelectionListener(this);
 }
 
 void SubsEditBox::Update(int type) {
@@ -344,13 +342,13 @@ void SubsEditBox::Update(int type) {
 	if (type == AssFile::COMMIT_FULL || type == AssFile::COMMIT_UNDO) {
 		/// @todo maybe preserve selection over undo?
 		StyleBox->Clear();
-		StyleBox->Append(grid->ass->GetStyles());
+		StyleBox->Append(c->ass->GetStyles());
 
 		ActorBox->Freeze();
 		ActorBox->Clear();
-		int nrows = grid->GetRows();
+		int nrows = c->subsGrid->GetRows();
 		for (int i=0;i<nrows;i++) {
-			wxString actor = grid->GetDialogue(i)->Actor;
+			wxString actor = c->subsGrid->GetDialogue(i)->Actor;
 			// OSX doesn't like combo boxes that are empty.
 			if (actor.empty()) actor = "Actor";
 			if (ActorBox->FindString(actor) == wxNOT_FOUND) {
@@ -396,20 +394,20 @@ void SubsEditBox::OnActiveLineChanged(AssDialogue *new_line) {
 	Update(AssFile::COMMIT_TEXT);
 
 	/// @todo VideoContext should be doing this
-	if (VideoContext::Get()->IsLoaded()) {
+	if (c->videoController->IsLoaded()) {
 		bool sync;
 		if (Search.hasFocus) sync = OPT_GET("Tool/Search Replace/Video Update")->GetBool();
 		else sync = OPT_GET("Video/Subtitle Sync")->GetBool();
 
 		if (sync) {
-			VideoContext::Get()->Stop();
-			VideoContext::Get()->JumpToTime(line->Start.GetMS());
+			c->videoController->Stop();
+			c->videoController->JumpToTime(line->Start.GetMS());
 		}
 	}
 	SetEvtHandlerEnabled(true);
 }
 void SubsEditBox::OnSelectedSetChanged(const Selection &, const Selection &) {
-	sel = grid->GetSelectedSet();
+	sel = c->subsGrid->GetSelectedSet();
 }
 
 void SubsEditBox::UpdateFrameTiming(agi::vfr::Framerate const& fps) {
@@ -421,7 +419,7 @@ void SubsEditBox::UpdateFrameTiming(agi::vfr::Framerate const& fps) {
 		ByTime->SetValue(true);
 		StartTime->SetByFrame(false);
 		EndTime->SetByFrame(false);
-		grid->SetByFrame(false);
+		c->subsGrid->SetByFrame(false);
 	}
 }
 
@@ -444,16 +442,16 @@ void SubsEditBox::OnCommitButton(wxCommandEvent &) {
 }
 
 void SubsEditBox::NextLine() {
-	int next = grid->GetLastSelRow() + 1;
-	if (next >= grid->GetRows()) {
-		AssDialogue *cur = grid->GetDialogue(next-1);
+	int next = c->subsGrid->GetLastSelRow() + 1;
+	if (next >= c->subsGrid->GetRows()) {
+		AssDialogue *cur = c->subsGrid->GetDialogue(next-1);
 		AssDialogue *newline = new AssDialogue;
 		newline->Start = cur->End;
 		newline->End = cur->End + OPT_GET("Timing/Default Duration")->GetInt();
 		newline->Style = cur->Style;
-		grid->InsertLine(newline,next-1,true,true);
+		c->subsGrid->InsertLine(newline,next-1,true,true);
 	}
-	grid->NextLine();
+	c->subsGrid->NextLine();
 }
 
 void SubsEditBox::OnChange(wxStyledTextEvent &event) {
@@ -473,7 +471,7 @@ void SubsEditBox::SetSelectedRows(setter set, T value, wxString desc, bool amend
 
 	for_each(sel.begin(), sel.end(), std::tr1::bind(set, _1, value));
 
-	commitId = grid->ass->Commit(desc, AssFile::COMMIT_TEXT, (amend && desc == lastCommitType) ? commitId : -1);
+	commitId = c->ass->Commit(desc, AssFile::COMMIT_TEXT, (amend && desc == lastCommitType) ? commitId : -1);
 	lastCommitType = desc;
 }
 
@@ -506,7 +504,7 @@ void SubsEditBox::CommitTimes(TimeField field) {
 		}
 	}
 
-	timeCommitId[field] = grid->ass->Commit(_("modify times"), AssFile::COMMIT_TIMES, timeCommitId[field]);
+	timeCommitId[field] = c->ass->Commit(_("modify times"), AssFile::COMMIT_TIMES, timeCommitId[field]);
 }
 
 void SubsEditBox::OnSize(wxSizeEvent &evt) {
@@ -547,7 +545,7 @@ void SubsEditBox::OnFrameTimeRadio(wxCommandEvent &event) {
 	StartTime->SetByFrame(byFrame);
 	EndTime->SetByFrame(byFrame);
 	Duration->SetByFrame(byFrame);
-	grid->SetByFrame(byFrame);
+	c->subsGrid->SetByFrame(byFrame);
 	event.Skip();
 }
 
@@ -634,14 +632,14 @@ void SubsEditBox::OnDurationChange(wxCommandEvent &) {
 }
 void SubsEditBox::OnMarginLChange(wxCommandEvent &) {
 	SetSelectedRows(std::mem_fun(&AssDialogue::SetMarginString<0>), MarginL->GetValue(), _("MarginL change"));
-	AssDialogue *cur = grid->GetDialogue(grid->GetFirstSelRow());
+	AssDialogue *cur = c->subsGrid->GetDialogue(c->subsGrid->GetFirstSelRow());
 	if (cur)
 		MarginL->ChangeValue(cur->GetMarginString(0,false));
 }
 
 void SubsEditBox::OnMarginRChange(wxCommandEvent &) {
 	SetSelectedRows(std::mem_fun(&AssDialogue::SetMarginString<1>), MarginR->GetValue(), _("MarginR change"));
-	AssDialogue *cur = grid->GetDialogue(grid->GetFirstSelRow());
+	AssDialogue *cur = c->subsGrid->GetDialogue(c->subsGrid->GetFirstSelRow());
 	if (cur)
 		MarginR->ChangeValue(cur->GetMarginString(1,false));
 }
@@ -653,7 +651,7 @@ static void set_margin_v(AssDialogue* diag, wxString value) {
 
 void SubsEditBox::OnMarginVChange(wxCommandEvent &) {
 	SetSelectedRows(set_margin_v, MarginV->GetValue(), _("MarginV change"));
-	AssDialogue *cur = grid->GetDialogue(grid->GetFirstSelRow());
+	AssDialogue *cur = c->subsGrid->GetDialogue(c->subsGrid->GetFirstSelRow());
 	if (cur)
 		MarginV->ChangeValue(cur->GetMarginString(2,false));
 }
@@ -746,7 +744,7 @@ void SubsEditBox::OnFlagButton(wxCommandEvent &evt) {
 	wxString tagname;
 	wxString desc;
 	bool state = false;
-	AssStyle *style = grid->ass->GetStyle(line->Style);
+	AssStyle *style = c->ass->GetStyle(line->Style);
 	AssStyle defStyle;
 	if (!style) style = &defStyle;
 	if (id == BUTTON_BOLD) {
@@ -797,7 +795,7 @@ void SubsEditBox::OnFontButton(wxCommandEvent &) {
 	int blockn = BlockAtPos(selstart);
 
 	wxFont startfont;
-	AssStyle *style = grid->ass->GetStyle(line->Style);
+	AssStyle *style = c->ass->GetStyle(line->Style);
 	AssStyle defStyle;
 	if (!style) style = &defStyle;
 
@@ -838,7 +836,7 @@ void SubsEditBox::OnColorButton(wxCommandEvent &evt) {
 	wxString alt;
 
 	wxColor color;
-	AssStyle *style = grid->ass->GetStyle(line->Style);
+	AssStyle *style = c->ass->GetStyle(line->Style);
 	AssStyle defStyle;
 	if (!style) style = &defStyle;
 	if (id == BUTTON_COLOR1) {
@@ -871,7 +869,7 @@ void SubsEditBox::OnColorButton(wxCommandEvent &evt) {
 
 	color = get_value(*line, blockn, color, colorTag, alt);
 	wxString initialText = line->Text;
-	wxColor newColor = GetColorFromUser<SubsEditBox, &SubsEditBox::SetColorCallback>(((AegisubApp*)wxTheApp)->frame, color, this);
+	wxColor newColor = GetColorFromUser<SubsEditBox, &SubsEditBox::SetColorCallback>(c->parent, color, this);
 	if (newColor == color) {
 		TextEdit->SetTextTo(initialText);
 		TextEdit->SetSelectionU(selstart, selend);
diff --git a/aegisub/src/subs_edit_box.h b/aegisub/src/subs_edit_box.h
index 5b5f69076..ef074f203 100644
--- a/aegisub/src/subs_edit_box.h
+++ b/aegisub/src/subs_edit_box.h
@@ -42,8 +42,8 @@
 
 #include "selection_controller.h"
 
+namespace agi { struct Context; }
 class AssDialogue;
-class SubtitlesGrid;
 class SubsTextEditCtrl;
 class TimeEdit;
 class wxButton;
@@ -55,7 +55,6 @@ class wxSpinCtrl;
 class wxStyledTextCtrl;
 class wxStyledTextEvent;
 class wxTextCtrl;
-class AudioController;
 
 namespace agi { namespace vfr { class Framerate; } }
 
@@ -84,8 +83,7 @@ class SubsEditBox : public wxPanel, protected SelectionListener<AssDialogue> {
 	wxColour disabledBgColour;
 	wxColour origBgColour;
 
-	// Externally supplied controls
-	SubtitlesGrid *grid;
+	agi::Context *c;
 
 	// Box controls
 	wxCheckBox *CommentBox;
@@ -196,7 +194,6 @@ public:
 
 	/// @brief Constructor
 	/// @param parent Parent window
-	/// @param grid Associated grid
-	SubsEditBox(wxWindow *parent, SubtitlesGrid *grid);
+	SubsEditBox(wxWindow *parent, agi::Context *context);
 	~SubsEditBox();
 };
diff --git a/aegisub/src/subs_grid.cpp b/aegisub/src/subs_grid.cpp
index 34096008a..5a2c1c06a 100644
--- a/aegisub/src/subs_grid.cpp
+++ b/aegisub/src/subs_grid.cpp
@@ -103,21 +103,15 @@ END_EVENT_TABLE()
 /// @param size     
 /// @param style    
 /// @param name     
-SubtitlesGrid::SubtitlesGrid(FrameMain* parentFr, wxWindow *parent, wxWindowID id, AssFile *subs, const wxPoint& pos, const wxSize& size, long style, const wxString& name)
-: BaseGrid(parent,id,pos,size,style,name)
-, ass(subs)
+SubtitlesGrid::SubtitlesGrid(wxWindow *parent, agi::Context *context,  const wxSize& size, long style, const wxString& name)
+: BaseGrid(parent,context,size,style,name)
+, seekListener(context->videoController->AddSeekListener(&SubtitlesGrid::Refresh, this, false, (const wxRect *)NULL))
 {
-	byFrame = false;
-	editBox = NULL;
-	parentFrame = parentFr;
-
-	seekListener = VideoContext::Get()->AddSeekListener(&SubtitlesGrid::Refresh, this, false, (const wxRect *)NULL);
-
 	OnHighlightVisibleChange(*OPT_GET("Subtitle/Grid/Highlight Subtitles in Frame"));
 	OPT_SUB("Subtitle/Grid/Highlight Subtitles in Frame", &SubtitlesGrid::OnHighlightVisibleChange, this);
 	OPT_SUB("Subtitle/Grid/Hide Overrides", std::tr1::bind(&SubtitlesGrid::Refresh, this, false, (const wxRect*)0));
-	ass->AddCommitListener(&SubtitlesGrid::OnSubtitlesCommit, this);
-	ass->AddFileOpenListener(&SubtitlesGrid::OnSubtitlesOpen, this);
+	context->ass->AddCommitListener(&SubtitlesGrid::OnSubtitlesCommit, this);
+	context->ass->AddFileOpenListener(&SubtitlesGrid::OnSubtitlesOpen, this);
 }
 
 /// @brief Destructor 
@@ -196,14 +190,14 @@ void SubtitlesGrid::OnPopupMenu(bool alternate) {
 		state = (sels == 1);
 		menu.Append(MENU_INSERT_BEFORE,_("&Insert (before)"),_T("Inserts a line before current"))->Enable(state);
 		menu.Append(MENU_INSERT_AFTER,_("Insert (after)"),_T("Inserts a line after current"))->Enable(state);
-		state = (sels == 1 && context->IsLoaded());
+		state = (sels == 1 && context->videoController->IsLoaded());
 		menu.Append(MENU_INSERT_BEFORE_VIDEO,_("Insert at video time (before)"),_T("Inserts a line after current, starting at video time"))->Enable(state);
 		menu.Append(MENU_INSERT_AFTER_VIDEO,_("Insert at video time (after)"),_T("Inserts a line after current, starting at video time"))->Enable(state);
 		menu.AppendSeparator();
 
 		// Duplicate selection
 		menu.Append(MENU_DUPLICATE,_("&Duplicate"),_("Duplicate the selected lines"))->Enable(continuous);
-		menu.Append(MENU_DUPLICATE_NEXT_FRAME,_("&Duplicate and shift by 1 frame"),_("Duplicate lines and shift by one frame"))->Enable(continuous && context->TimecodesLoaded());
+		menu.Append(MENU_DUPLICATE_NEXT_FRAME,_("&Duplicate and shift by 1 frame"),_("Duplicate lines and shift by one frame"))->Enable(continuous && context->videoController->TimecodesLoaded());
 		menu.Append(MENU_SPLIT_BY_KARAOKE,_("Split (by karaoke)"),_("Uses karaoke timing to split line into multiple smaller lines"))->Enable(sels > 0);
 
 		// Swaps selection
@@ -228,7 +222,7 @@ void SubtitlesGrid::OnPopupMenu(bool alternate) {
 		menu.AppendSeparator();
 
 		//Make audio clip
-		state = parentFrame->context->audioController->IsAudioOpen()==true;
+		state = context->audioController->IsAudioOpen();
 		menu.Append(MENU_AUDIOCLIP,_("Create audio clip"),_("Create an audio clip of the selected line"))->Enable(state);
 		menu.AppendSeparator();
 
@@ -343,7 +337,7 @@ void SubtitlesGrid::OnKeyDown(wxKeyEvent &event) {
 			}
 
 			// Duplicate and shift
-			if (context->TimecodesLoaded()) {
+			if (context->videoController->TimecodesLoaded()) {
 				if (Hotkeys.IsPressed(_T("Grid duplicate and shift one frame"))) {
 					DuplicateLines(n,n2,true);
 					return;
@@ -427,7 +421,7 @@ void SubtitlesGrid::OnSplitByKaraoke (wxCommandEvent &) {
 		didSplit |= SplitLineByKaraoke(sels[i]);
 	}
 	if (didSplit) {
-		ass->Commit(_("splitting"));
+		context->ass->Commit(_("splitting"));
 	}
 	EndBatch();
 }
@@ -498,7 +492,7 @@ void SubtitlesGrid::OnInsertBeforeVideo (wxCommandEvent &) {
 
 	// Create line to add
 	AssDialogue *def = new AssDialogue;
-	int video_ms = context->TimeAtFrame(context->GetFrameN(),agi::vfr::START);
+	int video_ms = context->videoController->TimeAtFrame(context->videoController->GetFrameN(),agi::vfr::START);
 	def->Start.SetMS(video_ms);
 	def->End.SetMS(video_ms+OPT_GET("Timing/Default Duration")->GetInt());
 	def->Style = GetDialogue(n)->Style;
@@ -518,7 +512,7 @@ void SubtitlesGrid::OnInsertAfterVideo (wxCommandEvent &) {
 
 	// Create line to add
 	AssDialogue *def = new AssDialogue;
-	int video_ms = context->TimeAtFrame(context->GetFrameN(),agi::vfr::START);
+	int video_ms = context->videoController->TimeAtFrame(context->videoController->GetFrameN(),agi::vfr::START);
 	def->Start.SetMS(video_ms);
 	def->End.SetMS(video_ms+OPT_GET("Timing/Default Duration")->GetInt());
 	def->Style = GetDialogue(n)->Style;
@@ -616,14 +610,14 @@ void SubtitlesGrid::OnRecombine(wxCommandEvent &) {
 		if (d1->Text == (*d2)->Text) {
 			expand_times(d1, *d2);
 			delete d1;
-			ass->Line.remove(d1);
+			context->ass->Line.remove(d1);
 			continue;
 		}
 
 		// 1, 1+2, 1 turns into 1, 2, [empty]
 		if (d1->Text.empty()) {
 			delete d1;
-			ass->Line.remove(d1);
+			context->ass->Line.remove(d1);
 			continue;
 		}
 
@@ -656,11 +650,11 @@ void SubtitlesGrid::OnRecombine(wxCommandEvent &) {
 		}
 	}
 
-	ass->Commit(_("combining"));
+	context->ass->Commit(_("combining"));
 
 	// Remove now non-existent lines from the selection
 	Selection lines;
-	transform(ass->Line.begin(), ass->Line.end(), inserter(lines, lines.begin()), cast<AssDialogue*>());
+	transform(context->ass->Line.begin(), context->ass->Line.end(), inserter(lines, lines.begin()), cast<AssDialogue*>());
 	Selection newSel;
 	set_intersection(lines.begin(), lines.end(), selectedSet.begin(), selectedSet.end(), inserter(newSel, newSel.begin()));
 
@@ -677,7 +671,7 @@ void SubtitlesGrid::OnRecombine(wxCommandEvent &) {
 /// @brief Export audio clip of line 
 void SubtitlesGrid::OnAudioClip(wxCommandEvent &) {
 	int64_t num_samples,start=0,end=0,temp;
-	AudioController *audioController = parentFrame->context->audioController;
+	AudioController *audioController = context->audioController;
 	const AudioProvider *provider = audioController->GetAudioProvider();
 	AssDialogue *cur;
 	wxArrayInt sel = GetSelection();
@@ -763,7 +757,7 @@ void SubtitlesGrid::SwapLines(int n1,int n2) {
 	
 	std::swap(*dlg1, *dlg2);
 
-	ass->Commit(_("swap lines"));
+	context->ass->Commit(_("swap lines"));
 }
 
 /// @brief Insert a line 
@@ -773,14 +767,14 @@ void SubtitlesGrid::SwapLines(int n1,int n2) {
 /// @param update 
 void SubtitlesGrid::InsertLine(AssDialogue *line,int n,bool after,bool update) {
 	AssDialogue *rel_line = GetDialogue(n);
-	entryIter pos = std::find(ass->Line.begin(), ass->Line.end(), rel_line);
+	entryIter pos = std::find(context->ass->Line.begin(), context->ass->Line.end(), rel_line);
 	if (after) ++pos;
 
-	entryIter newIter = ass->Line.insert(pos,line);
+	entryIter newIter = context->ass->Line.insert(pos,line);
 
 	// Update
 	if (update) {
-		ass->Commit(_("line insertion"));
+		context->ass->Commit(_("line insertion"));
 	}
 	else {
 		UpdateMaps();
@@ -896,7 +890,7 @@ void SubtitlesGrid::PasteLines(int n,bool pasteOver) {
 
 		// Update data post-insertion
 		if (inserted > 0) {
-			ass->Commit(_("paste"), pasteOver ? AssFile::COMMIT_TEXT : AssFile::COMMIT_FULL);
+			context->ass->Commit(_("paste"), pasteOver ? AssFile::COMMIT_TEXT : AssFile::COMMIT_FULL);
 
 			// Set selection
 			if (!pasteOver) {
@@ -913,14 +907,14 @@ void SubtitlesGrid::PasteLines(int n,bool pasteOver) {
 }
 
 void SubtitlesGrid::DeleteLines(wxArrayInt target, bool flagModified) {
-	entryIter before_first = std::find_if(ass->Line.begin(), ass->Line.end(), cast<AssDialogue*>()); --before_first;
+	entryIter before_first = std::find_if(context->ass->Line.begin(), context->ass->Line.end(), cast<AssDialogue*>()); --before_first;
 	int old_active_line_index = GetDialogueIndex(GetActiveLine());
 
 	int row = -1;
 	int deleted = 0;
-	for (entryIter cur = ass->Line.begin(); cur != ass->Line.end();) {
+	for (entryIter cur = context->ass->Line.begin(); cur != context->ass->Line.end();) {
 		if (dynamic_cast<AssDialogue*>(*cur) && ++row == target[deleted]) {
-			cur = ass->Line.erase(cur);
+			cur = context->ass->Line.erase(cur);
 			++deleted;
 			if (deleted == target.size()) break;
 		}
@@ -933,12 +927,12 @@ void SubtitlesGrid::DeleteLines(wxArrayInt target, bool flagModified) {
 	if (GetRows() == deleted) {
 		AssDialogue *def = new AssDialogue;
 		++before_first;
-		ass->Line.insert(before_first, def);
+		context->ass->Line.insert(before_first, def);
 		old_active_line_index = 0;
 	}
 
 	if (flagModified) {
-		ass->Commit(_("delete"));
+		context->ass->Commit(_("delete"));
 	}
 	else {
 		UpdateMaps();
@@ -991,7 +985,7 @@ void SubtitlesGrid::JoinLines(int n1,int n2,bool concat) {
 	// Delete remaining lines (this will auto commit)
 	DeleteLines(GetRangeArray(n1+1,n2), false);
 
-	ass->Commit(_("join lines"));
+	context->ass->Commit(_("join lines"));
 
 	// Select new line
 	SetActiveLine(cur);
@@ -1031,7 +1025,7 @@ void SubtitlesGrid::AdjoinLines(int n1,int n2,bool setStart) {
 		}
 	}
 
-	ass->Commit(_("adjoin"));
+	context->ass->Commit(_("adjoin"));
 }
 
 void SubtitlesGrid::JoinAsKaraoke(int n1,int n2) {
@@ -1073,7 +1067,7 @@ void SubtitlesGrid::JoinAsKaraoke(int n1,int n2) {
 	// Delete remaining lines (this will auto commit)
 	DeleteLines(GetRangeArray(n1+1,n2), false);
 
-	ass->Commit(_("join as karaoke"));
+	context->ass->Commit(_("join as karaoke"));
 
 	// Select new line
 	SetActiveLine(cur);
@@ -1091,9 +1085,9 @@ void SubtitlesGrid::DuplicateLines(int n1,int n2,bool nextFrame) {
 
 		// Shift to next frame
 		if (nextFrame) {
-			int posFrame = context->FrameAtTime(cur->End.GetMS(),agi::vfr::END) + 1;
-			cur->Start.SetMS(context->TimeAtFrame(posFrame,agi::vfr::START));
-			cur->End.SetMS(context->TimeAtFrame(posFrame,agi::vfr::END));
+			int posFrame = context->videoController->FrameAtTime(cur->End.GetMS(),agi::vfr::END) + 1;
+			cur->Start.SetMS(context->videoController->TimeAtFrame(posFrame,agi::vfr::START));
+			cur->End.SetMS(context->videoController->TimeAtFrame(posFrame,agi::vfr::END));
 		}
 
 		// Insert
@@ -1122,8 +1116,8 @@ void SubtitlesGrid::ShiftLineByFrames(int n,int len,int type) {
 	assert(type >= 0 && type <= 2);
 	AssDialogue *cur = GetDialogue(n);
 
-	if (type != 2) cur->Start.SetMS(context->TimeAtFrame(len + context->FrameAtTime(cur->Start.GetMS(),agi::vfr::START),agi::vfr::START));
-	if (type != 1) cur->End.SetMS(context->TimeAtFrame(len + context->FrameAtTime(cur->End.GetMS(),agi::vfr::END),agi::vfr::END));
+	if (type != 2) cur->Start.SetMS(context->videoController->TimeAtFrame(len + context->videoController->FrameAtTime(cur->Start.GetMS(),agi::vfr::START),agi::vfr::START));
+	if (type != 1) cur->End.SetMS(context->videoController->TimeAtFrame(len + context->videoController->FrameAtTime(cur->End.GetMS(),agi::vfr::END),agi::vfr::END));
 }
 
 void SubtitlesGrid::SplitLine(AssDialogue *n1,int pos,bool estimateTimes) {
@@ -1141,7 +1135,7 @@ void SubtitlesGrid::SplitLine(AssDialogue *n1,int pos,bool estimateTimes) {
 		n2->Start.SetMS(splitTime);
 	}
 
-	ass->Commit(_("split"));
+	context->ass->Commit(_("split"));
 }
 
 bool SubtitlesGrid::SplitLineByKaraoke(int lineNumber) {
@@ -1184,10 +1178,10 @@ bool SubtitlesGrid::SplitLineByKaraoke(int lineNumber) {
 }
 
 void SubtitlesGrid::SetSubsToVideo(bool start) {
-	if (!context->IsLoaded()) return;
+	if (!context->videoController->IsLoaded()) return;
 
 	// Get new time
-	int ms = context->TimeAtFrame(context->GetFrameN(),start ? agi::vfr::START : agi::vfr::END);
+	int ms = context->videoController->TimeAtFrame(context->videoController->GetFrameN(),start ? agi::vfr::START : agi::vfr::END);
 
 	// Update selection
 	wxArrayInt sel = GetSelection();
@@ -1202,7 +1196,7 @@ void SubtitlesGrid::SetSubsToVideo(bool start) {
 	}
 
 	if (modified) {
-		ass->Commit(_("timing"), AssFile::COMMIT_TIMES);
+		context->ass->Commit(_("timing"), AssFile::COMMIT_TIMES);
 	}
 }
 
@@ -1212,9 +1206,9 @@ void SubtitlesGrid::SetVideoToSubs(bool start) {
 	AssDialogue *cur = GetDialogue(sel[0]);
 	if (cur) {
 		if (start) 
-			context->JumpToTime(cur->Start.GetMS());
+			context->videoController->JumpToTime(cur->Start.GetMS());
 		else 
-			context->JumpToTime(cur->End.GetMS(), agi::vfr::END);
+			context->videoController->JumpToTime(cur->End.GetMS(), agi::vfr::END);
 	}
 }
 
@@ -1231,7 +1225,7 @@ std::vector<int> SubtitlesGrid::GetAbsoluteSelection() {
 	GetSelectedSet(sel);
 
 	int line_index = 0;
-	for (entryIter it = ass->Line.begin(); it != ass->Line.end(); ++it, ++line_index) {
+	for (entryIter it = context->ass->Line.begin(); it != context->ass->Line.end(); ++it, ++line_index) {
 		if (sel.find(dynamic_cast<AssDialogue*>(*it)) != sel.end())
 			result.push_back(line_index);
 	}
@@ -1248,11 +1242,11 @@ void SubtitlesGrid::SetSelectionFromAbsolute(std::vector<int> &selection) {
 	std::sort(selection.begin(), selection.end());
 
 	int i = 0;
-	std::list<AssEntry*>::iterator j = ass->Line.begin();
+	std::list<AssEntry*>::iterator j = context->ass->Line.begin();
 	
 	for (size_t selveci = 0; selveci < selection.size(); ++selveci) {
-		while (i != selection[selveci] && j != ass->Line.end()) ++i, ++j;
-		if (j == ass->Line.end()) break; /// @todo Report error somehow
+		while (i != selection[selveci] && j != context->ass->Line.end()) ++i, ++j;
+		if (j == context->ass->Line.end()) break; /// @todo Report error somehow
 		AssDialogue *dlg = dynamic_cast<AssDialogue*>(*j);
 		if (dlg) newsel.insert(dlg);
 	}
diff --git a/aegisub/src/subs_grid.h b/aegisub/src/subs_grid.h
index eec73bbb1..0fc9639d5 100644
--- a/aegisub/src/subs_grid.h
+++ b/aegisub/src/subs_grid.h
@@ -52,11 +52,7 @@
 
 namespace agi { class OptionValue; }
 
-class AssFile;
 class AssEntry;
-class AssDialogue;
-class SubsEditBox;
-class FrameMain;
 
 typedef std::list<AssEntry*>::iterator entryIter;
 
@@ -66,7 +62,6 @@ typedef std::list<AssEntry*>::iterator entryIter;
 ///
 /// DOCME
 class SubtitlesGrid: public BaseGrid {
-private:
 	agi::signal::Connection seekListener;
 
 	void OnPopupMenu(bool alternate=false);
@@ -103,10 +98,7 @@ private:
 	void OnSubtitlesOpen();
 
 public:
-	/// Currently open file
-	AssFile *ass;
-
-	SubtitlesGrid(FrameMain* parentFrame,wxWindow *parent, wxWindowID id, AssFile *subs, const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize, long style = wxWANTS_CHARS, const wxString& name = wxPanelNameStr);
+	SubtitlesGrid(wxWindow *parent, agi::Context *context, const wxSize& size = wxDefaultSize, long style = wxWANTS_CHARS, const wxString& name = wxPanelNameStr);
 	~SubtitlesGrid();
 
 	/// @brief Jump to the start/end time of the current subtitle line
diff --git a/aegisub/src/video_display.cpp b/aegisub/src/video_display.cpp
index 8ff48e12c..63b0254b9 100644
--- a/aegisub/src/video_display.cpp
+++ b/aegisub/src/video_display.cpp
@@ -158,7 +158,7 @@ VideoDisplay::VideoDisplay(
 	slots.push_back(con->videoController->AddSeekListener(&VideoDisplay::SetFrame, this));
 	slots.push_back(con->videoController->AddVideoOpenListener(&VideoDisplay::OnVideoOpen, this));
 	slots.push_back(con->videoController->AddARChangeListener(&VideoDisplay::UpdateSize, this));
-	slots.push_back(model->AddCommitListener(&VideoDisplay::OnCommit, this));
+	slots.push_back(con->ass->AddCommitListener(&VideoDisplay::OnCommit, this));
 
 	SetCursor(wxNullCursor);
 }
diff --git a/aegisub/src/video_display.h b/aegisub/src/video_display.h
index 5352b0c27..eb231f849 100644
--- a/aegisub/src/video_display.h
+++ b/aegisub/src/video_display.h
@@ -47,7 +47,6 @@
 #include <libaegisub/signal.h>
 
 // Prototypes
-class AssFile;
 class FrameReadyEvent;
 class VideoBox;
 class VideoContext;
@@ -186,8 +185,6 @@ class VideoDisplay : public wxGLCanvas {
 	/// The dropdown box for selecting zoom levels
 	wxComboBox *zoomBox;
 
-	AssFile *model;
-
 public:
 	/// The VideoBox this display is contained in
 	VideoBox *box;
diff --git a/aegisub/src/visual_tool.cpp b/aegisub/src/visual_tool.cpp
index 4c66e6b94..b1be50192 100644
--- a/aegisub/src/visual_tool.cpp
+++ b/aegisub/src/visual_tool.cpp
@@ -69,7 +69,7 @@ VisualTool<FeatureType>::VisualTool(VideoDisplay *parent, agi::Context *context,
 , commitId(-1)
 , selChanged(false)
 , selectedFeatures(selFeatures)
-, grid(context->subsGrid)
+, c(context)
 , parent(parent)
 , holding(false)
 , dragging(false)
@@ -81,15 +81,15 @@ VisualTool<FeatureType>::VisualTool(VideoDisplay *parent, agi::Context *context,
 , ctrlDown(false)
 , altDown(false)
 {
-	frameNumber = context->videoController->GetFrameN();
+	frameNumber = c->videoController->GetFrameN();
 	curDiag = GetActiveDialogueLine();
-	grid->AddSelectionListener(this);
+	c->selectionController->AddSelectionListener(this);
 	curFeature = features.begin();
 }
 
 template<class FeatureType>
 VisualTool<FeatureType>::~VisualTool() {
-	grid->RemoveSelectionListener(this);
+	c->selectionController->RemoveSelectionListener(this);
 }
 
 template<class FeatureType>
@@ -203,7 +203,7 @@ void VisualTool<FeatureType>::OnMouseEvent(wxMouseEvent &event) {
 			else {
 				selChanged = false;
 			}
-			if (curFeature->line) grid->SetActiveLine(curFeature->line);
+			if (curFeature->line) c->selectionController->SetActiveLine(curFeature->line);
 
 			if (InitializeDrag(curFeature)) {
 				dragStartX = video.x;
@@ -222,8 +222,8 @@ void VisualTool<FeatureType>::OnMouseEvent(wxMouseEvent &event) {
 			if (!altDown) {
 				ClearSelection();
 				Selection sel;
-				sel.insert(grid->GetActiveLine());
-				grid->SetSelectedSet(sel);
+				sel.insert(c->selectionController->GetActiveLine());
+				c->selectionController->SetSelectedSet(sel);
 				needRender = true;
 			}
 			if (curDiag && InitializeHold()) {
@@ -248,14 +248,14 @@ void VisualTool<FeatureType>::Commit(wxString message) {
 	if (message.empty()) {
 		message = _("visual typesetting");
 	}
-	commitId = grid->ass->Commit(message, AssFile::COMMIT_TEXT, commitId);
+	commitId = c->ass->Commit(message, AssFile::COMMIT_TEXT, commitId);
 	externalChange = true;
 }
 
 template<class FeatureType>
 AssDialogue* VisualTool<FeatureType>::GetActiveDialogueLine() {
-	AssDialogue *diag = grid->GetActiveLine();
-	if (diag && grid->IsDisplayed(diag))
+	AssDialogue *diag = c->selectionController->GetActiveLine();
+	if (diag && c->subsGrid->IsDisplayed(diag))
 		return diag;
 	return NULL;
 }
@@ -312,7 +312,7 @@ void VisualTool<FeatureType>::SetFrame(int newFrameNumber) {
 
 template<class FeatureType>
 void VisualTool<FeatureType>::OnActiveLineChanged(AssDialogue *new_line) {
-	if (new_line && !grid->IsDisplayed(new_line)) {
+	if (new_line && !c->subsGrid->IsDisplayed(new_line)) {
 		new_line = NULL;
 	}
 	if (new_line != curDiag) {
@@ -335,7 +335,7 @@ void VisualTool<FeatureType>::SetSelection(feature_iterator feat) {
 
 		Selection sel;
 		sel.insert(line);
-		grid->SetSelectedSet(sel);
+		c->selectionController->SetSelectedSet(sel);
 	}
 }
 
@@ -344,9 +344,9 @@ template<class FeatureType>
 void VisualTool<FeatureType>::AddSelection(feature_iterator feat) {
 	if (selFeatures.insert(feat).second && feat->line) {
 		lineSelCount[feat->line] += 1;
-		Selection sel = grid->GetSelectedSet();
+		Selection sel = c->selectionController->GetSelectedSet();
 		if (sel.insert(feat->line).second) {
-			grid->SetSelectedSet(sel);
+			c->selectionController->SetSelectedSet(sel);
 		}
 	}
 }
@@ -360,7 +360,7 @@ void VisualTool<FeatureType>::RemoveSelection(feature_iterator feat) {
 		lineSelCount[line] -= 1;
 		assert(lineSelCount[line] >= 0);
 		if (lineSelCount[line] <= 0) {
-			Selection sel = grid->GetSelectedSet();
+			Selection sel = c->selectionController->GetSelectedSet();
 
 			// Don't deselect the only selected line
 			if (sel.size() <= 1) return;
@@ -369,11 +369,11 @@ void VisualTool<FeatureType>::RemoveSelection(feature_iterator feat) {
 
 			// Set the active line to an arbitrary selected line if we just
 			// deselected the active line
-			if (line == grid->GetActiveLine()) {
-				grid->SetActiveLine(*sel.begin());
+			if (line == c->selectionController->GetActiveLine()) {
+				c->selectionController->SetActiveLine(*sel.begin());
 			}
 
-			grid->SetSelectedSet(sel);
+			c->selectionController->SetSelectedSet(sel);
 		}
 	}
 }
@@ -435,7 +435,7 @@ void VisualTool<FeatureType>::GetLinePosition(AssDialogue *diag,int &x, int &y,
 	for (int i=0;i<4;i++) margin[i] = diag->Margin[i];
 	int align = 2;
 
-	AssStyle *style = grid->ass->GetStyle(diag->Style);
+	AssStyle *style = c->ass->GetStyle(diag->Style);
 	if (style) {
 		align = style->alignment;
 		for (int i=0;i<4;i++) {
@@ -444,7 +444,7 @@ void VisualTool<FeatureType>::GetLinePosition(AssDialogue *diag,int &x, int &y,
 	}
 
 	int sw,sh;
-	VideoContext::Get()->GetScriptSize(sw,sh);
+	c->videoController->GetScriptSize(sw,sh);
 
 	// Process margins
 	margin[1] = sw - margin[1];
@@ -515,7 +515,7 @@ template<class FeatureType>
 void VisualTool<FeatureType>::GetLineRotation(AssDialogue *diag,float &rx,float &ry,float &rz) {
 	rx = ry = rz = 0.f;
 
-	AssStyle *style = grid->ass->GetStyle(diag->Style);
+	AssStyle *style = c->ass->GetStyle(diag->Style);
 	if (style) {
 		rz = style->angle;
 	}
@@ -533,7 +533,7 @@ template<class FeatureType>
 void VisualTool<FeatureType>::GetLineScale(AssDialogue *diag,float &scalX,float &scalY) {
 	scalX = scalY = 100.f;
 
-	AssStyle *style = grid->ass->GetStyle(diag->Style);
+	AssStyle *style = c->ass->GetStyle(diag->Style);
 	if (style) {
 		scalX = style->scalex;
 		scalY = style->scaley;
@@ -551,7 +551,7 @@ template<class FeatureType>
 void VisualTool<FeatureType>::GetLineClip(AssDialogue *diag,int &x1,int &y1,int &x2,int &y2,bool &inverse) {
 	x1 = y1 = 0;
 	int sw,sh;
-	VideoContext::Get()->GetScriptSize(sw,sh);
+	c->videoController->GetScriptSize(sw,sh);
 	x2 = sw-1;
 	y2 = sh-1;
 	inverse = false;
diff --git a/aegisub/src/visual_tool.h b/aegisub/src/visual_tool.h
index 66bb8d86e..ca9243627 100644
--- a/aegisub/src/visual_tool.h
+++ b/aegisub/src/visual_tool.h
@@ -155,7 +155,7 @@ protected:
 	/// Read-only reference to the set of selected features for subclasses
 	const std::set<feature_iterator, ltaddr> &selectedFeatures;
 	typedef typename std::set<feature_iterator, ltaddr>::const_iterator sel_iterator;
-	SubtitlesGrid *grid;
+	agi::Context *c;
 	VideoDisplay *parent; /// VideoDisplay which this belongs to, used to frame conversion
 	bool holding; /// Is a hold currently in progress?
 	AssDialogue *curDiag; /// Active dialogue line; NULL if it is not visible on the current frame
diff --git a/aegisub/src/visual_tool_cross.cpp b/aegisub/src/visual_tool_cross.cpp
index 3ae0ec15f..6509139f8 100644
--- a/aegisub/src/visual_tool_cross.cpp
+++ b/aegisub/src/visual_tool_cross.cpp
@@ -36,6 +36,7 @@
 #include "config.h"
 
 #include "ass_file.h"
+#include "include/aegisub/context.h"
 #include "gl_text.h"
 #include "subs_grid.h"
 #include "video_context.h"
@@ -61,7 +62,7 @@ bool VisualToolCross::Update() {
 	dx -= vx;
 	dy -= vy;
 
-	Selection sel = grid->GetSelectedSet();
+	Selection sel = c->selectionController->GetSelectedSet();
 	for (Selection::const_iterator cur = sel.begin(); cur != sel.end(); ++cur) {
 		int x1, y1;
 		GetLinePosition(*cur, x1, y1);
diff --git a/aegisub/src/visual_tool_drag.cpp b/aegisub/src/visual_tool_drag.cpp
index 1ebc6b039..115624df1 100644
--- a/aegisub/src/visual_tool_drag.cpp
+++ b/aegisub/src/visual_tool_drag.cpp
@@ -37,6 +37,7 @@
 
 #include "ass_dialogue.h"
 #include "ass_file.h"
+#include "include/aegisub/context.h"
 #include "libresrc/libresrc.h"
 #include "subs_grid.h"
 #include "utils.h"
@@ -64,7 +65,7 @@ VisualToolDrag::VisualToolDrag(VideoDisplay *parent, agi::Context *context, Vide
 	toolBar->Realize();
 	toolBar->Show(true);
 
-	grid->GetSelectedSet(selection);
+	c->selectionController->GetSelectedSet(selection);
 	OnFileChanged();
 }
 
@@ -124,9 +125,9 @@ void VisualToolDrag::OnFileChanged() {
 	ClearSelection();
 	primary = NULL;
 
-	for (int i = grid->GetRows() - 1; i >=0; i--) {
-		AssDialogue *diag = grid->GetDialogue(i);
-		if (BaseGrid::IsDisplayed(diag)) {
+	for (int i = c->subsGrid->GetRows() - 1; i >=0; i--) {
+		AssDialogue *diag = c->subsGrid->GetDialogue(i);
+		if (c->subsGrid->IsDisplayed(diag)) {
 			MakeFeatures(diag);
 		}
 	}
@@ -134,14 +135,14 @@ void VisualToolDrag::OnFileChanged() {
 }
 
 void VisualToolDrag::OnFrameChanged() {
-	if (primary && !BaseGrid::IsDisplayed(primary->line)) primary = NULL;
+	if (primary && !c->subsGrid->IsDisplayed(primary->line)) primary = NULL;
 
 	feature_iterator feat = features.begin();
 	feature_iterator end = features.end();
 
-	for (int i = grid->GetRows() - 1; i >=0; i--) {
-		AssDialogue *diag = grid->GetDialogue(i);
-		if (BaseGrid::IsDisplayed(diag)) {
+	for (int i = c->subsGrid->GetRows() - 1; i >=0; i--) {
+		AssDialogue *diag = c->subsGrid->GetDialogue(i);
+		if (c->subsGrid->IsDisplayed(diag)) {
 			// Features don't exist and should
 			if (feat == end || feat->line != diag) {
 				MakeFeatures(diag, feat);
@@ -163,10 +164,10 @@ void VisualToolDrag::OnFrameChanged() {
 }
 
 void VisualToolDrag::OnSelectedSetChanged(const Selection &added, const Selection &removed) {
-	grid->GetSelectedSet(selection);
+	c->selectionController->GetSelectedSet(selection);
 	if (!externalChange) return;
 	externalChange = false;
-	grid->BeginBatch();
+	c->subsGrid->BeginBatch();
 
 	for (feature_iterator cur = features.begin(); cur != features.end(); ++cur) {
 		// Remove all deselected lines
@@ -179,7 +180,7 @@ void VisualToolDrag::OnSelectedSetChanged(const Selection &added, const Selectio
 		}
 	}
 
-	grid->EndBatch();
+	c->subsGrid->EndBatch();
 	externalChange = true;
 }
 
@@ -290,7 +291,7 @@ bool VisualToolDrag::InitializeDrag(feature_iterator feature) {
 	// Set time of clicked feature to the current frame and shift all other
 	// selected features by the same amount
 	if (feature->type != DRAG_ORIGIN) {
-		int time = VideoContext::Get()->TimeAtFrame(frameNumber) - feature->line->Start.GetMS();
+		int time = c->videoController->TimeAtFrame(frameNumber) - feature->line->Start.GetMS();
 		int change = time - feature->time;
 
 		for (sel_iterator cur = selectedFeatures.begin(); cur != selectedFeatures.end(); ++cur) {
diff --git a/aegisub/src/visual_tool_rotatexy.cpp b/aegisub/src/visual_tool_rotatexy.cpp
index c1529886a..d3526229e 100644
--- a/aegisub/src/visual_tool_rotatexy.cpp
+++ b/aegisub/src/visual_tool_rotatexy.cpp
@@ -41,6 +41,7 @@
 
 #include "ass_dialogue.h"
 #include "ass_file.h"
+#include "include/aegisub/context.h"
 #include "subs_grid.h"
 #include "utils.h"
 #include "video_context.h"
@@ -188,7 +189,7 @@ void VisualToolRotateXY::UpdateHold() {
 }
 
 void VisualToolRotateXY::CommitHold() {
-	Selection sel = grid->GetSelectedSet();
+	Selection sel = c->selectionController->GetSelectedSet();
 	for (Selection::const_iterator cur = sel.begin(); cur != sel.end(); ++cur) {
 		SetOverride(*cur, L"\\frx",wxString::Format(L"(%0.3g)",curAngleX));
 		SetOverride(*cur, L"\\fry",wxString::Format(L"(%0.3g)",curAngleY));
diff --git a/aegisub/src/visual_tool_rotatez.cpp b/aegisub/src/visual_tool_rotatez.cpp
index 475d903d0..a812e9bdd 100644
--- a/aegisub/src/visual_tool_rotatez.cpp
+++ b/aegisub/src/visual_tool_rotatez.cpp
@@ -41,6 +41,7 @@
 
 #include "ass_dialogue.h"
 #include "ass_file.h"
+#include "include/aegisub/context.h"
 #include "subs_grid.h"
 #include "utils.h"
 #include "video_context.h"
@@ -150,7 +151,7 @@ void VisualToolRotateZ::UpdateHold() {
 }
 
 void VisualToolRotateZ::CommitHold() {
-	Selection sel = grid->GetSelectedSet();
+	Selection sel = c->selectionController->GetSelectedSet();
 	for (Selection::const_iterator cur = sel.begin(); cur != sel.end(); ++cur) {
 		SetOverride(*cur, L"\\frz",wxString::Format(L"(%0.3g)",curAngle));
 	}
diff --git a/aegisub/src/visual_tool_scale.cpp b/aegisub/src/visual_tool_scale.cpp
index af964cae4..ae16bf98b 100644
--- a/aegisub/src/visual_tool_scale.cpp
+++ b/aegisub/src/visual_tool_scale.cpp
@@ -41,6 +41,7 @@
 
 #include "ass_dialogue.h"
 #include "ass_file.h"
+#include "include/aegisub/context.h"
 #include "subs_grid.h"
 #include "utils.h"
 #include "video_context.h"
@@ -145,7 +146,7 @@ void VisualToolScale::UpdateHold() {
 }
 
 void VisualToolScale::CommitHold() {
-	Selection sel = grid->GetSelectedSet();
+	Selection sel = c->selectionController->GetSelectedSet();
 	for (Selection::const_iterator cur = sel.begin(); cur != sel.end(); ++cur) {
 		SetOverride(*cur, L"\\fscx",wxString::Format(L"(%0.3g)",curScaleX));
 		SetOverride(*cur, L"\\fscy",wxString::Format(L"(%0.3g)",curScaleY));