diff --git a/build/Aegisub/Aegisub.vcxproj b/build/Aegisub/Aegisub.vcxproj
index 7c2e91466..b1bac423c 100644
--- a/build/Aegisub/Aegisub.vcxproj
+++ b/build/Aegisub/Aegisub.vcxproj
@@ -171,6 +171,7 @@
     <ClInclude Include="$(SrcDir)frame_main.h" />
     <ClInclude Include="$(SrcDir)gl_text.h" />
     <ClInclude Include="$(SrcDir)gl_wrap.h" />
+    <ClInclude Include="$(SrcDir)grid_column.h" />
     <ClInclude Include="$(SrcDir)help_button.h" />
     <ClInclude Include="$(SrcDir)hotkey_data_view_model.h" />
     <ClInclude Include="$(SrcDir)include\aegisub\audio_player.h" />
@@ -373,6 +374,7 @@
     <ClCompile Include="$(SrcDir)frame_main.cpp" />
     <ClCompile Include="$(SrcDir)gl_text.cpp" />
     <ClCompile Include="$(SrcDir)gl_wrap.cpp" />
+    <ClCompile Include="$(SrcDir)grid_column.cpp" />
     <ClCompile Include="$(SrcDir)help_button.cpp" />
     <ClCompile Include="$(SrcDir)hotkey.cpp" />
     <ClCompile Include="$(SrcDir)hotkey_data_view_model.cpp" />
diff --git a/build/Aegisub/Aegisub.vcxproj.filters b/build/Aegisub/Aegisub.vcxproj.filters
index b9a07eebd..2441580aa 100644
--- a/build/Aegisub/Aegisub.vcxproj.filters
+++ b/build/Aegisub/Aegisub.vcxproj.filters
@@ -624,6 +624,9 @@
     <ClInclude Include="$(SrcDir)resolution_resampler.h">
       <Filter>Features\Resolution resampler</Filter>
     </ClInclude>
+    <ClInclude Include="$(SrcDir)grid_column.h">
+      <Filter>Main UI\Grid</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="$(SrcDir)ass_dialogue.cpp">
@@ -1181,6 +1184,9 @@
     <ClCompile Include="$(SrcDir)text_selection_controller.cpp">
       <Filter>Main UI\Edit box</Filter>
     </ClCompile>
+    <ClCompile Include="$(SrcDir)grid_column.cpp">
+      <Filter>Main UI\Grid</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="$(SrcDir)res/res.rc">
diff --git a/libaegisub/include/libaegisub/util.h b/libaegisub/include/libaegisub/util.h
index ca92c3edd..f6589e83c 100644
--- a/libaegisub/include/libaegisub/util.h
+++ b/libaegisub/include/libaegisub/util.h
@@ -19,6 +19,7 @@
 #include <libaegisub/time.h>
 
 #include <algorithm>
+#include <boost/range/irange.hpp>
 #include <cstdint>
 #include <string>
 #include <memory>
@@ -74,5 +75,10 @@ namespace agi {
 
 	std::string ErrorString(int error);
 
+	template<typename Integer>
+	auto range(Integer end) -> decltype(boost::irange<Integer>(0, end)) {
+		return boost::irange<Integer>(0, end);
+	}
+
 	} // namespace util
 } // namespace agi
diff --git a/src/Makefile b/src/Makefile
index 25a1e001c..919c55abc 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -194,6 +194,7 @@ SRC += \
 	frame_main.cpp \
 	gl_text.cpp \
 	gl_wrap.cpp \
+	grid_column.cpp \
 	help_button.cpp \
 	hotkey.cpp \
 	hotkey_data_view_model.cpp \
diff --git a/src/base_grid.cpp b/src/base_grid.cpp
index 4002a5edb..970501c0b 100644
--- a/src/base_grid.cpp
+++ b/src/base_grid.cpp
@@ -35,24 +35,23 @@
 
 #include "ass_dialogue.h"
 #include "ass_file.h"
-#include "ass_style.h"
 #include "audio_box.h"
 #include "compat.h"
 #include "frame_main.h"
+#include "grid_column.h"
 #include "options.h"
 #include "utils.h"
 #include "selection_controller.h"
 #include "subs_controller.h"
 #include "video_context.h"
-#include "video_slider.h"
+
+#include <libaegisub/util.h>
 
 #include <algorithm>
 #include <boost/range/algorithm.hpp>
-#include <boost/range/irange.hpp>
 #include <cmath>
 #include <iterator>
 #include <numeric>
-#include <unordered_map>
 
 #include <wx/dcbuffer.h>
 #include <wx/kbdstate.h>
@@ -65,23 +64,11 @@ enum {
 	MENU_SHOW_COL = 1250 // Needs 15 IDs after this
 };
 
-namespace std {
-	template <typename T>
-	struct hash<boost::flyweight<T>> {
-		size_t operator()(boost::flyweight<T> const& ss) const {
-			return hash<const void*>()(&ss.get());
-		}
-	};
-}
-
 BaseGrid::BaseGrid(wxWindow* parent, agi::Context *context)
 : wxWindow(parent, -1, wxDefaultPosition, wxDefaultSize, wxWANTS_CHARS | wxSUNKEN_BORDER)
 , scrollBar(new wxScrollBar(this, GRID_SCROLLBAR, wxDefaultPosition, wxDefaultSize, wxSB_VERTICAL))
-, seek_listener(context->videoController->AddSeekListener(std::bind(&BaseGrid::Refresh, this, false, nullptr)))
-, headerNames({{
-	_("#"), _("L"), _("Start"), _("End"), _("CPS"), _("Style"), _("Actor"),
-	_("Effect"), _("Left"), _("Right"), _("Vert"), _("Text")
-}})
+, columns(GetGridColumns())
+, seek_listener(context->videoController->AddSeekListener([&] { Refresh(false); }))
 , context(context)
 {
 	scrollBar->SetScrollbar(0,10,100,10);
@@ -149,8 +136,8 @@ void BaseGrid::OnSubtitlesCommit(int type) {
 	if (type & AssFile::COMMIT_DIAG_TIME)
 		Refresh(false);
 	else if (type & AssFile::COMMIT_DIAG_TEXT) {
-		RefreshRect(wxRect(cps_col_x, 0, cps_col_w, GetClientSize().GetHeight()), false);
-		RefreshRect(wxRect(text_col_x, 0, text_col_w, GetClientSize().GetHeight()), false);
+		for (auto const& rect : text_refresh_rects)
+			RefreshRect(rect, false);
 	}
 }
 
@@ -164,9 +151,9 @@ void BaseGrid::OnSubtitlesSave() {
 
 void BaseGrid::OnShowColMenu(wxCommandEvent &event) {
 	int item = event.GetId() - MENU_SHOW_COL;
-	showCol[item] = !showCol[item];
+	column_shown[item] = !column_shown[item];
 
-	OPT_SET("Subtitle/Grid/Column")->SetListBool(std::vector<bool>(std::begin(showCol), std::end(showCol)));
+	OPT_SET("Subtitle/Grid/Column")->SetListBool(std::vector<bool>(std::begin(column_shown), std::end(column_shown)));
 
 	SetColumnWidths();
 	Refresh(false);
@@ -203,13 +190,12 @@ void BaseGrid::UpdateStyle() {
 
 	// Set column widths
 	std::vector<bool> column_array(OPT_GET("Subtitle/Grid/Column")->GetListBool());
-	assert(column_array.size() <= showCol.size());
-	boost::copy(column_array, std::begin(showCol));
-	for (size_t i : boost::irange(column_array.size(), showCol.size()))
-		showCol[i] = true;
+	column_shown.assign(column_array.begin(), column_array.end());
+	column_shown.resize(columns.size(), true);
 
-	for (int i : boost::irange(0, column_count))
-		headerWidth[i] = dc.GetTextExtent(headerNames[i]).GetWidth();
+	column_header_widths.resize(columns.size());
+	for (size_t i : agi::util::range(columns.size()))
+		column_header_widths[i] = dc.GetTextExtent(columns[i]->Header()).GetWidth();
 
 	SetColumnWidths();
 
@@ -268,32 +254,29 @@ void BaseGrid::SelectRow(int row, bool addToSelected, bool select) {
 }
 
 void BaseGrid::OnPaint(wxPaintEvent &) {
-	// Get size and pos
-	wxSize cs = GetClientSize();
-	cs.SetWidth(cs.GetWidth() - scrollBar->GetSize().GetWidth());
-
 	// Find which columns need to be repainted
-	bool paint_columns[column_count] = {0};
+	std::vector<GridColumn *> paint_columns;
+	std::vector<int> paint_column_widths;
 	for (wxRegionIterator region(GetUpdateRegion()); region; ++region) {
 		wxRect updrect = region.GetRect();
 		int x = 0;
-		for (int i : boost::irange(0, column_count)) {
-			if (updrect.x < x + colWidth[i] && updrect.x + updrect.width > x && colWidth[i])
-				paint_columns[i] = true;
-			x += colWidth[i];
+		for (size_t i : agi::util::range(columns.size())) {
+			if (updrect.x < x + column_widths[i] && updrect.x + updrect.width > x && column_widths[i])
+				paint_columns.push_back(columns[i].get());
+			else
+				paint_columns.push_back(nullptr);
+			x += column_widths[i];
 		}
 	}
 
-	wxAutoBufferedPaintDC dc(this);
-	DrawImage(dc, paint_columns);
-}
+	if (paint_columns.empty()) return;
 
-void BaseGrid::DrawImage(wxDC &dc, bool paint_columns[]) {
 	int w = 0;
 	int h = 0;
 	GetClientSize(&w,&h);
 	w -= scrollBar->GetSize().GetWidth();
 
+	wxAutoBufferedPaintDC dc(this);
 	dc.SetFont(font);
 
 	dc.SetBackground(row_colors.Default);
@@ -302,12 +285,7 @@ void BaseGrid::DrawImage(wxDC &dc, bool paint_columns[]) {
 	// Draw labels
 	dc.SetPen(*wxTRANSPARENT_PEN);
 	dc.SetBrush(row_colors.LeftCol);
-	dc.DrawRectangle(0,lineHeight,colWidth[0],h-lineHeight);
-
-	// Visible lines
-	int drawPerScreen = h/lineHeight + 1;
-	int nDraw = mid(0,drawPerScreen,GetRows()-yPos);
-	int maxH = (nDraw+1) * lineHeight;
+	dc.DrawRectangle(0, lineHeight, column_widths[0], h-lineHeight);
 
 	// Row colors
 	wxColour text_standard(to_wx(OPT_GET("Colour/Subtitle Grid/Standard")->GetColor()));
@@ -320,181 +298,109 @@ void BaseGrid::DrawImage(wxDC &dc, bool paint_columns[]) {
 	dc.DrawLine(0, 0, w, 0);
 	dc.SetPen(*wxTRANSPARENT_PEN);
 
-	auto strings = headerNames;
+	auto paint_text = [&](wxString const& str, int x, int y, int col) {
+		wxSize ext = dc.GetTextExtent(str);
 
-	int override_mode = OPT_GET("Subtitle/Grid/Hide Overrides")->GetInt();
-	wxString replace_char;
-	if (override_mode == 1)
-		replace_char = to_wx(OPT_GET("Subtitle/Grid/Hide Overrides Char")->GetString());
+		int top = y + (lineHeight - ext.GetHeight()) / 2;
+		int left = x + 4;
+		if (columns[col]->Centered())
+			left += (column_widths[col] - 6 - ext.GetWidth()) / 2;
+
+		dc.DrawText(str, left, top);
+	};
+
+	// Paint header
+	{
+		dc.SetTextForeground(text_standard);
+		dc.SetBrush(row_colors.Header);
+		dc.DrawRectangle(0, 0, w, lineHeight);
+
+		int x = 0;
+		for (size_t i : agi::util::range(columns.size())) {
+			if (paint_columns[i])
+				paint_text(columns[i]->Header(), x, 0, i);
+			x += column_widths[i];
+		}
+
+		dc.SetPen(grid_pen);
+		dc.DrawLine(0, lineHeight, w, lineHeight);
+	}
+
+	// Paint the rows
+	int drawPerScreen = h/lineHeight + 1;
+	int nDraw = mid(0, drawPerScreen, GetRows() - yPos);
 
 	auto active_line = context->selectionController->GetActiveLine();
 	auto const& selection = context->selectionController->GetSelectedSet();
 
-	for (int i = 0; i < nDraw + 1; i++) {
-		int curRow = i + yPos - 1;
-		wxBrush curColor = row_colors.Default;
-		AssDialogue *curDiag = nullptr;
+	for (int i : agi::util::range(nDraw)) {
+		wxBrush color = row_colors.Default;
+		AssDialogue *curDiag = index_line_map[i + yPos];
 
-		// Header
-		if (i == 0) {
-			curColor = row_colors.Header;
+		bool inSel = !!selection.count(curDiag);
+		if (inSel && curDiag->Comment)
+			color = row_colors.SelectedComment;
+		else if (inSel)
+			color = row_colors.Selection;
+		else if (curDiag->Comment)
+			color = row_colors.Comment;
+		else if (OPT_GET("Subtitle/Grid/Highlight Subtitles in Frame")->GetBool() && IsDisplayed(curDiag))
+			color = row_colors.Visible;
+
+		if (active_line != curDiag && curDiag->CollidesWith(active_line))
+			dc.SetTextForeground(text_collision);
+		else if (inSel)
+			dc.SetTextForeground(text_selection);
+		else
 			dc.SetTextForeground(text_standard);
-		}
-		// Lines
-		else if ((curDiag = GetDialogue(curRow))) {
-			GetRowStrings(curRow, curDiag, paint_columns, &strings[0], !!override_mode, replace_char);
-
-			bool inSel = !!selection.count(curDiag);
-			if (inSel && curDiag->Comment)
-				curColor = row_colors.SelectedComment;
-			else if (inSel)
-				curColor = row_colors.Selection;
-			else if (curDiag->Comment)
-				curColor = row_colors.Comment;
-			else if (OPT_GET("Subtitle/Grid/Highlight Subtitles in Frame")->GetBool() && IsDisplayed(curDiag))
-				curColor = row_colors.Visible;
-
-			if (active_line != curDiag && curDiag->CollidesWith(active_line))
-				dc.SetTextForeground(text_collision);
-			else if (inSel)
-				dc.SetTextForeground(text_selection);
-			else
-				dc.SetTextForeground(text_standard);
-		}
-		else {
-			assert(false);
-		}
 
 		// Draw row background color
-		if (curColor != row_colors.Default) {
-			dc.SetBrush(curColor);
-			dc.DrawRectangle(
-				(i == 0) ? 0 : colWidth[0], i * lineHeight + 1,
-				w, lineHeight);
+		if (color != row_colors.Default) {
+			dc.SetBrush(color);
+			dc.DrawRectangle(column_widths[0], (i + 1) * lineHeight + 1, w, lineHeight);
 		}
 
 		// Draw text
-		int dx = 0;
-		int dy = i*lineHeight;
-		for (int j : boost::irange(0, column_count)) {
-			if (colWidth[j] == 0) continue;
+		int x = 0;
+		int y = (i + 1) * lineHeight;
+		for (size_t j : agi::util::range(columns.size())) {
+			if (column_widths[j] == 0) continue;
 
-			if (paint_columns[j]) {
-				wxSize ext = dc.GetTextExtent(strings[j]);
-
-				int left = dx + 4;
-				int top = dy + (lineHeight - ext.GetHeight()) / 2;
-
-				// Centered columns
-				if (!(j == 5 || j == 6 || j == 7 || j == 11)) {
-					left += (colWidth[j] - 6 - ext.GetWidth()) / 2;
-				}
-
-				dc.DrawText(strings[j], left, top);
-			}
-			dx += colWidth[j];
+			if (paint_columns[j])
+				paint_text(columns[j]->Value(curDiag, byFrame ? context : nullptr), x, y, j);
+			x += column_widths[j];
 		}
 
 		// Draw grid
-		dc.DestroyClippingRegion();
 		if (curDiag == active_line) {
 			dc.SetPen(wxPen(to_wx(OPT_GET("Colour/Subtitle Grid/Active Border")->GetColor())));
 			dc.SetBrush(*wxTRANSPARENT_BRUSH);
-			dc.DrawRectangle(0, dy, w, lineHeight + 1);
+			dc.DrawRectangle(0, y, w, lineHeight + 1);
 		}
 		else {
 			dc.SetPen(grid_pen);
-			dc.DrawLine(0, dy + lineHeight, w , dy + lineHeight);
+			dc.DrawLine(0, y + lineHeight, w , y + lineHeight);
 		}
 		dc.SetPen(*wxTRANSPARENT_PEN);
 	}
 
 	// Draw grid columns
-	int dx = 0;
-	dc.SetPen(grid_pen);
-	for (int i : boost::irange(0, column_count - 1)) {
-		dx += colWidth[i];
-		dc.DrawLine(dx, 0, dx, maxH);
-	}
-	dc.DrawLine(0, 0, 0, maxH);
-	dc.DrawLine(w-1, 0, w-1, maxH);
-}
-
-void BaseGrid::GetRowStrings(int row, AssDialogue *line, bool *paint_columns, wxString *strings, bool replace, wxString const& rep_char) const {
-	if (paint_columns[0]) strings[0] = std::to_wstring(row + 1);
-	if (paint_columns[1]) strings[1] = std::to_wstring(line->Layer);
-	if (byFrame) {
-		if (paint_columns[2]) strings[2] = std::to_wstring(context->videoController->FrameAtTime(line->Start, agi::vfr::START));
-		if (paint_columns[3]) strings[3] = std::to_wstring(context->videoController->FrameAtTime(line->End, agi::vfr::END));
-	}
-	else {
-		if (paint_columns[2]) strings[2] = to_wx(line->Start.GetAssFormated());
-		if (paint_columns[3]) strings[3] = to_wx(line->End.GetAssFormated());
-	}
-	if (paint_columns[5])  strings[5]  = to_wx(line->Style);
-	if (paint_columns[6])  strings[6]  = to_wx(line->Actor);
-	if (paint_columns[7])  strings[7]  = to_wx(line->Effect);
-	if (paint_columns[8])  strings[8]  = line->Margin[0] ? wxString(std::to_wstring(line->Margin[0])) : wxString();
-	if (paint_columns[9])  strings[9]  = line->Margin[1] ? wxString(std::to_wstring(line->Margin[1])) : wxString();
-	if (paint_columns[10]) strings[10] = line->Margin[2] ? wxString(std::to_wstring(line->Margin[2])) : wxString();
-
-	if (paint_columns[4]) {
-		int characters = 0;
-
-		auto const& text = line->Text.get();
-		auto pos = begin(text);
-		do {
-			auto it = std::find(pos, end(text), '{');
-			characters += CharacterCount(pos, it, true);
-			if (it == end(text)) break;
-
-			pos = std::find(pos, end(text), '}');
-			if (pos == end(text)) {
-				characters += CharacterCount(it, pos, true);
-				break;
-			}
-		} while (++pos != end(text));
-
-		int duration = line->End - line->Start;
-		if (duration <= 0 || characters * 1000 / duration >= 1000)
-			strings[4] = "";
-		else
-			strings[4] = std::to_wstring(characters * 1000 / duration);
-	}
-
-	if (paint_columns[11]) {
-		strings[11].clear();
-
-		// Show overrides
-		if (!replace)
-			strings[11] = to_wx(line->Text);
-		// Hidden overrides
-		else {
-			strings[11].reserve(line->Text.get().size());
-			size_t start = 0, pos;
-			while ((pos = line->Text.get().find('{', start)) != std::string::npos) {
-				strings[11] += to_wx(line->Text.get().substr(start, pos - start));
-				strings[11] += rep_char;
-				start = line->Text.get().find('}', pos);
-				if (start != std::string::npos) ++start;
-			}
-			if (start != std::string::npos)
-				strings[11] += to_wx(line->Text.get().substr(start));
+	{
+		int maxH = (nDraw + 1) * lineHeight;
+		int x = 0;
+		dc.SetPen(grid_pen);
+		for (int width : column_widths) {
+			x += width;
+			if (x < w)
+				dc.DrawLine(x, 0, x, maxH);
 		}
-
-		// Cap length and set text
-		if (strings[11].size() > 512)
-			strings[11] = strings[11].Left(512) + "...";
+		dc.DrawLine(0, 0, 0, maxH);
+		dc.DrawLine(w - 1, 0, w - 1, maxH);
 	}
 }
 
 void BaseGrid::OnSize(wxSizeEvent &) {
 	AdjustScrollbar();
-
-	int w, h;
-	GetClientSize(&w, &h);
-	colWidth[11] = text_col_w = w - text_col_x;
-
 	Refresh(false);
 }
 
@@ -625,23 +531,11 @@ void BaseGrid::OnContextMenu(wxContextMenuEvent &evt) {
 		menu::OpenPopupMenu(context_menu.get(), this);
 	}
 	else {
-		const wxString strings[] = {
-			_("Line Number"),
-			_("Layer"),
-			_("Start"),
-			_("End"),
-			_("Characters per Second"),
-			_("Style"),
-			_("Actor"),
-			_("Effect"),
-			_("Left"),
-			_("Right"),
-			_("Vert"),
-		};
-
 		wxMenu menu;
-		for (size_t i : boost::irange<size_t>(0, boost::size(strings)))
-			menu.Append(MENU_SHOW_COL + i, strings[i], "", wxITEM_CHECK)->Check(showCol[i]);
+		for (size_t i : agi::util::range(columns.size())) {
+			if (columns[i]->CanHide())
+				menu.Append(MENU_SHOW_COL + i, columns[i]->Description(), "", wxITEM_CHECK)->Check(!!column_shown[i]);
+		}
 		PopupMenu(&menu);
 	}
 }
@@ -688,94 +582,26 @@ void BaseGrid::SetColumnWidths() {
 	wxClientDC dc(this);
 	dc.SetFont(font);
 
-	// O(1) widths
-	int marginLen = dc.GetTextExtent("0000").GetWidth();
-	int cpsLen = dc.GetTextExtent("999").GetWidth();
+	WidthHelper helper{dc, {}};
 
-	int labelLen = dc.GetTextExtent(std::to_wstring(GetRows())).GetWidth();
-	int startLen = 0;
-	int endLen = 0;
-	if (!byFrame)
-		startLen = endLen = dc.GetTextExtent(to_wx(AssTime().GetAssFormated())).GetWidth();
-
-	std::unordered_map<boost::flyweight<std::string>, int> widths;
-	auto get_width = [&](boost::flyweight<std::string> const& str) -> int {
-		if (str.get().empty()) return 0;
-		auto it = widths.find(str);
-		if (it != end(widths)) return it->second;
-		int width = dc.GetTextExtent(to_wx(str)).GetWidth();
-		widths[str] = width;
-		return width;
-	};
-
-	// O(n) widths
-	bool showMargin[3] = { false, false, false };
-	int styleLen = 0;
-	int actorLen = 0;
-	int effectLen = 0;
-	int maxLayer = 0;
-	int maxStart = 0;
-	int maxEnd = 0;
-	for (auto const& diag : context->ass->Events) {
-		maxLayer = std::max(maxLayer, diag.Layer);
-		actorLen = std::max(actorLen, get_width(diag.Actor));
-		styleLen = std::max(styleLen, get_width(diag.Style));
-		effectLen = std::max(effectLen, get_width(diag.Effect));
-
-		// Margins
-		for (int j = 0; j < 3; j++) {
-			if (diag.Margin[j])
-				showMargin[j] = true;
-		}
-
-		// Times
-		if (byFrame) {
-			maxStart = std::max(maxStart, context->videoController->FrameAtTime(diag.Start, agi::vfr::START));
-			maxEnd = std::max(maxEnd, context->videoController->FrameAtTime(diag.End, agi::vfr::END));
+	column_widths.clear();
+	for (auto i : agi::util::range(columns.size())) {
+		if (!column_shown[i])
+			column_widths.push_back(0);
+		else {
+			int width = columns[i]->Width(context, helper, byFrame);
+			if (width) // 10 is an arbitrary amount of padding
+				width = 10 + std::max(width, column_header_widths[i]);
+			column_widths.push_back(width);
 		}
 	}
 
-	// Finish layer
-	int layerLen = maxLayer ? dc.GetTextExtent(std::to_wstring(maxLayer)).GetWidth() : 0;
-
-	// Finish times
-	if (byFrame) {
-		startLen = dc.GetTextExtent(std::to_wstring(maxStart)).GetWidth();
-		endLen = dc.GetTextExtent(std::to_wstring(maxEnd)).GetWidth();
+	text_refresh_rects.clear();
+	int x = 0;
+	for (auto i : agi::util::range(columns.size())) {
+		if (columns[i]->RefreshOnTextChange() && column_widths[i])
+			text_refresh_rects.emplace_back(x, 0, column_widths[i], h);
 	}
-
-	// Set column widths
-	colWidth[0] = labelLen;
-	colWidth[1] = layerLen;
-	colWidth[2] = startLen;
-	colWidth[3] = endLen;
-	colWidth[4] = cpsLen;
-	colWidth[5] = styleLen;
-	colWidth[6] = actorLen;
-	colWidth[7] = effectLen;
-	for (int i = 0; i < 3; i++)
-		colWidth[i + 8] = showMargin[i] ? marginLen : 0;
-	colWidth[11] = 1;
-
-	// Hide columns and ensure every visible column is at least as big as its
-	// header plus padding
-	for (size_t i : boost::irange<size_t>(0u, showCol.size())) {
-		if (!showCol[i])
-			colWidth[i] = 0;
-		else if (colWidth[i])
-			colWidth[i] = 10 + std::max(colWidth[i], headerWidth[i]);
-	}
-
-	// Set size of last
-	int total = std::accumulate(colWidth.begin(), colWidth.end(), 0);
-	colWidth[11] = std::max(w - total, 0);
-
-	time_cols_x = colWidth[0] + colWidth[1];
-	time_cols_w = colWidth[2] + colWidth[3] + colWidth[4];
-	cps_col_x = time_cols_x + colWidth[2] + colWidth[3];
-	cps_col_w = colWidth[4];
-	text_col_x = total;
-	text_col_w = colWidth[11];
 }
 
 AssDialogue *BaseGrid::GetDialogue(int n) const {
diff --git a/src/base_grid.h b/src/base_grid.h
index 5c6d661e3..726ee726a 100644
--- a/src/base_grid.h
+++ b/src/base_grid.h
@@ -39,10 +39,9 @@ namespace agi {
 	class OptionValue;
 }
 class AssDialogue;
+struct GridColumn;
 
 class BaseGrid final : public wxWindow {
-	static const int column_count = 12;
-
 	std::vector<agi::signal::Connection> connections;
 	int lineHeight = 1;     ///< Height of a line in pixels in the current font
 	bool holding = false;   ///< Is a drag selection in process?
@@ -50,6 +49,13 @@ class BaseGrid final : public wxWindow {
 	wxScrollBar *scrollBar; ///< The grid's scrollbar
 	bool byFrame = false;   ///< Should times be displayed as frame numbers
 
+	std::vector<std::unique_ptr<GridColumn>> columns;
+	std::vector<int> column_widths;
+	std::vector<int> column_header_widths;
+	std::vector<char> column_shown;
+
+	std::vector<wxRect> text_refresh_rects;
+
 	/// Cached brushes used for row backgrounds
 	struct {
 		wxBrush Default;
@@ -88,24 +94,8 @@ class BaseGrid final : public wxWindow {
 	void OnSubtitlesSave();
 	void OnActiveLineChanged(AssDialogue *);
 
-	void DrawImage(wxDC &dc, bool paint_columns[]);
-	void GetRowStrings(int row, AssDialogue *line, bool *paint_columns, wxString *strings, bool replace, wxString const& rep_char) const;
-
 	void ScrollTo(int y);
 
-	std::array<int, column_count> colWidth; ///< Width in pixels of each column
-	std::array<int, column_count> headerWidth; ///< Width in pixels of each column's header
-	std::array<wxString, column_count> headerNames;
-
-	int time_cols_x; ///< Left edge of the times columns
-	int time_cols_w; ///< Width of the two times columns
-	int text_col_x; ///< Left edge of the text column
-	int text_col_w; ///< Width of the text column
-	int cps_col_x; ///< Left edge of the cps column
-	int cps_col_w; ///< Width of the cps column
-
-	std::array<bool, column_count - 1> showCol; ///< Column visibility mask (Text can't be hidden)
-
 	int yPos = 0;
 
 	void AdjustScrollbar();
diff --git a/src/grid_column.cpp b/src/grid_column.cpp
new file mode 100644
index 000000000..e71b522f2
--- /dev/null
+++ b/src/grid_column.cpp
@@ -0,0 +1,332 @@
+// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+// Aegisub Project http://www.aegisub.org/
+
+#include "grid_column.h"
+
+#include "ass_dialogue.h"
+#include "ass_file.h"
+#include "compat.h"
+#include "include/aegisub/context.h"
+#include "options.h"
+#include "utils.h"
+#include "video_context.h"
+
+#include <wx/dc.h>
+
+int WidthHelper::operator()(boost::flyweight<std::string> const& str) {
+	if (str.get().empty()) return 0;
+	auto it = widths.find(str);
+	if (it != end(widths)) return it->second;
+	int width = dc.GetTextExtent(to_wx(str)).GetWidth();
+	widths[str] = width;
+	return width;
+}
+
+int WidthHelper::operator()(std::string const& str) {
+	return dc.GetTextExtent(to_wx(str)).GetWidth();
+}
+
+int WidthHelper::operator()(wxString const& str) {
+	return dc.GetTextExtent(str).GetWidth();
+}
+
+namespace {
+#define COLUMN_HEADER(value) \
+	private: const wxString header = value; \
+	public: wxString const& Header() const override { return header; }
+#define COLUMN_DESCRIPTION(value) \
+	private: const wxString description = value; \
+	public: wxString const& Description() const override { return description; }
+
+struct GridColumnLineNumber final : GridColumn {
+	COLUMN_HEADER(_("#"))
+	COLUMN_DESCRIPTION(_("Line Number"))
+	bool Centered() const override { return true; }
+
+	wxString Value(const AssDialogue *d, const agi::Context * = nullptr) const override {
+		return std::to_wstring(d->Row + 1);
+	}
+
+	int Width(const agi::Context *c, WidthHelper &helper, bool) const override {
+		return helper(Value(&c->ass->Events.back()));
+	}
+};
+
+template<typename T>
+T max_value(T AssDialogueBase::*field, EntryList<AssDialogue> const& lines) {
+	T value = 0;
+	for (AssDialogue const& line : lines) {
+		if (line.*field > value)
+			value = line.*field;
+	}
+	return value;
+}
+
+struct GridColumnLayer final : GridColumn {
+	COLUMN_HEADER(_("L"))
+	COLUMN_DESCRIPTION(_("Layer"))
+	bool Centered() const override { return true; }
+
+	wxString Value(const AssDialogue *d, const agi::Context *) const override {
+		return d->Layer ? wxString(std::to_wstring(d->Layer)) : wxString();
+	}
+
+	int Width(const agi::Context *c, WidthHelper &helper, bool) const override {
+		int max_layer = max_value(&AssDialogue::Layer, c->ass->Events);
+		return max_layer == 0 ? 0 : helper(std::to_wstring(max_layer));
+	}
+};
+
+struct GridColumnStartTime final : GridColumn {
+	COLUMN_HEADER(_("Start"))
+	COLUMN_DESCRIPTION(_("Start Time"))
+	bool Centered() const override { return true; }
+
+	wxString Value(const AssDialogue *d, const agi::Context *c) const override {
+		if (c)
+			return std::to_wstring(c->videoController->FrameAtTime(d->Start, agi::vfr::START));
+		return to_wx(d->Start.GetAssFormated());
+	}
+
+	int Width(const agi::Context *c, WidthHelper &helper, bool by_frame) const override {
+		if (!by_frame)
+			return helper(wxS("0:00:00.00"));
+		int frame = c->videoController->FrameAtTime(max_value(&AssDialogue::Start, c->ass->Events), agi::vfr::START);
+		return helper(std::to_wstring(frame));
+	}
+};
+
+struct GridColumnEndTime final : GridColumn {
+	COLUMN_HEADER(_("End"))
+	COLUMN_DESCRIPTION(_("End Time"))
+	bool Centered() const override { return true; }
+
+	wxString Value(const AssDialogue *d, const agi::Context *c) const override {
+		if (c)
+			return std::to_wstring(c->videoController->FrameAtTime(d->End, agi::vfr::END));
+		return to_wx(d->End.GetAssFormated());
+	}
+
+	int Width(const agi::Context *c, WidthHelper &helper, bool by_frame) const override {
+		if (!by_frame)
+			return helper(wxS("0:00:00.00"));
+		int frame = c->videoController->FrameAtTime(max_value(&AssDialogue::End, c->ass->Events), agi::vfr::END);
+		return helper(std::to_wstring(frame));
+	}
+};
+
+template<typename T>
+int max_width(T AssDialogueBase::*field, EntryList<AssDialogue> const& lines, WidthHelper &helper) {
+	int w = 0;
+	for (AssDialogue const& line : lines) {
+		auto const& v = line.*field;
+		if (v.get().empty()) continue;
+		int width = helper(v);
+		if (width > w)
+			w = width;
+	}
+	return w;
+}
+
+struct GridColumnStyle final : GridColumn {
+	COLUMN_HEADER(_("Style"))
+	COLUMN_DESCRIPTION(_("Style"))
+	bool Centered() const override { return false; }
+
+	wxString Value(const AssDialogue *d, const agi::Context *c) const override {
+		return to_wx(d->Style);
+	}
+
+	int Width(const agi::Context *c, WidthHelper &helper, bool) const override {
+		return max_width(&AssDialogue::Style, c->ass->Events, helper);
+	}
+};
+
+struct GridColumnEffect final : GridColumn {
+	COLUMN_HEADER(_("Effect"))
+	COLUMN_DESCRIPTION(_("Effect"))
+	bool Centered() const override { return false; }
+
+	wxString Value(const AssDialogue *d, const agi::Context *) const override {
+		return to_wx(d->Effect);
+	}
+
+	int Width(const agi::Context *c, WidthHelper &helper, bool) const override {
+		return max_width(&AssDialogue::Effect, c->ass->Events, helper);
+	}
+};
+
+struct GridColumnActor final : GridColumn {
+	COLUMN_HEADER(_("Actor"))
+	COLUMN_DESCRIPTION(_("Actor"))
+	bool Centered() const override { return false; }
+
+	wxString Value(const AssDialogue *d, const agi::Context *) const override {
+		return to_wx(d->Actor);
+	}
+
+	int Width(const agi::Context *c, WidthHelper &helper, bool) const override {
+		return max_width(&AssDialogue::Actor, c->ass->Events, helper);
+	}
+};
+
+template<int Index>
+struct GridColumnMargin : GridColumn {
+	bool Centered() const override { return true; }
+
+	wxString Value(const AssDialogue *d, const agi::Context *) const override {
+		return d->Margin[Index] ? wxString(std::to_wstring(d->Margin[Index])) : wxString();
+	}
+
+	int Width(const agi::Context *c, WidthHelper &helper, bool) const override {
+		int max = 0;
+		for (AssDialogue const& line : c->ass->Events) {
+			if (line.Margin[Index] > max)
+				max = line.Margin[Index];
+		}
+		return max == 0 ? 0 : helper(std::to_wstring(max));
+	}
+};
+
+struct GridColumnMarginLeft final : GridColumnMargin<0> {
+	COLUMN_HEADER(_("Left"))
+	COLUMN_DESCRIPTION(_("Left Margin"))
+};
+
+struct GridColumnMarginRight final : GridColumnMargin<0> {
+	COLUMN_HEADER(_("Right"))
+	COLUMN_DESCRIPTION(_("Right Margin"))
+};
+
+struct GridColumnMarginVert final : GridColumnMargin<0> {
+	COLUMN_HEADER(_("Vert"))
+	COLUMN_DESCRIPTION(_("Vertical Margin"))
+};
+
+struct GridColumnCPS final : GridColumn {
+	COLUMN_HEADER(_("CPS"))
+	COLUMN_DESCRIPTION(_("Characters Per Second"))
+	bool Centered() const override { return true; }
+	bool RefreshOnTextChange() const override { return true; }
+
+	wxString Value(const AssDialogue *d, const agi::Context *) const override {
+		int characters = 0;
+
+		auto const& text = d->Text.get();
+		auto pos = begin(text);
+		do {
+			auto it = std::find(pos, end(text), '{');
+			characters += CharacterCount(pos, it, true);
+			if (it == end(text)) break;
+
+			pos = std::find(pos, end(text), '}');
+			if (pos == end(text)) {
+				characters += CharacterCount(it, pos, true);
+				break;
+			}
+		} while (++pos != end(text));
+
+		int duration = d->End - d->Start;
+		if (duration <= 0 || characters * 1000 / duration >= 1000)
+			return wxS("");
+		else
+			return std::to_wstring(characters * 1000 / duration);
+	}
+
+	int Width(const agi::Context *c, WidthHelper &helper, bool) const override {
+		return helper(wxS("999"));
+	}
+};
+
+class GridColumnText final : public GridColumn {
+	int override_mode;
+	wxString replace_char;
+
+	agi::signal::Connection override_mode_connection;
+	agi::signal::Connection replace_char_connection;
+
+public:
+	GridColumnText()
+	: override_mode(OPT_GET("Subtitle/Grid/Hide Overrides")->GetInt())
+	, replace_char(to_wx(OPT_GET("Subtitle/Grid/Hide Overrides Char")->GetString()))
+	, override_mode_connection(OPT_SUB("Subtitle/Grid/Hide Overrides",
+		[&](agi::OptionValue const& v) { override_mode = v.GetInt(); }))
+	, replace_char_connection(OPT_SUB("Subtitle/Grid/Hide Overrides Char",
+		[&](agi::OptionValue const& v) { replace_char = to_wx(v.GetString()); }))
+	{
+	}
+
+	COLUMN_HEADER(_("Text"))
+	COLUMN_DESCRIPTION(_("Text"))
+	bool Centered() const override { return false; }
+	bool CanHide() const override { return false; }
+	bool RefreshOnTextChange() const override { return true; }
+
+	wxString Value(const AssDialogue *d, const agi::Context *) const override {
+		wxString str;
+
+		// Show overrides
+		if (override_mode == 0)
+			str = to_wx(d->Text);
+		// Hidden overrides
+		else {
+			str.reserve(d->Text.get().size());
+			size_t start = 0, pos;
+			while ((pos = d->Text.get().find('{', start)) != std::string::npos) {
+				str += to_wx(d->Text.get().substr(start, pos - start));
+				if (override_mode == 1)
+					str += replace_char;
+				start = d->Text.get().find('}', pos);
+				if (start != std::string::npos) ++start;
+			}
+			if (start != std::string::npos)
+				str += to_wx(d->Text.get().substr(start));
+		}
+
+		// Cap length and set text
+		if (str.size() > 512)
+			str = str.Left(512) + "...";
+		return str;
+	}
+
+	int Width(const agi::Context *c, WidthHelper &helper, bool) const override {
+		return 5000;
+	}
+};
+
+template<typename T>
+std::unique_ptr<GridColumn> make() {
+	return std::unique_ptr<GridColumn>(new T);
+}
+
+}
+
+std::vector<std::unique_ptr<GridColumn>> GetGridColumns() {
+	std::vector<std::unique_ptr<GridColumn>> ret;
+	ret.push_back(make<GridColumnLineNumber>());
+	ret.push_back(make<GridColumnLayer>());
+	ret.push_back(make<GridColumnStartTime>());
+	ret.push_back(make<GridColumnEndTime>());
+	ret.push_back(make<GridColumnCPS>());
+	ret.push_back(make<GridColumnStyle>());
+	ret.push_back(make<GridColumnEffect>());
+	ret.push_back(make<GridColumnActor>());
+	ret.push_back(make<GridColumnMarginLeft>());
+	ret.push_back(make<GridColumnMarginRight>());
+	ret.push_back(make<GridColumnMarginVert>());
+	ret.push_back(make<GridColumnText>());
+	return ret;
+}
diff --git a/src/grid_column.h b/src/grid_column.h
new file mode 100644
index 000000000..10d8501d3
--- /dev/null
+++ b/src/grid_column.h
@@ -0,0 +1,60 @@
+// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+// Aegisub Project http://www.aegisub.org/
+
+#include <boost/flyweight.hpp>
+#include <memory>
+#include <string>
+#include <vector>
+#include <unordered_map>
+
+class AssDialogue;
+class wxClientDC;
+class wxString;
+namespace agi { struct Context; }
+
+namespace std {
+	template <typename T>
+	struct hash<boost::flyweight<T>> {
+		size_t operator()(boost::flyweight<T> const& ss) const {
+			return hash<const void*>()(&ss.get());
+		}
+	};
+}
+
+struct WidthHelper {
+	wxDC &dc;
+	std::unordered_map<boost::flyweight<std::string>, int> widths;
+
+	int operator()(boost::flyweight<std::string> const& str);
+	int operator()(std::string const& str);
+	int operator()(wxString const& str);
+};
+
+struct GridColumn {
+	virtual ~GridColumn() = default;
+
+	virtual bool Centered() const = 0;
+	virtual bool CanHide() const { return true; }
+	virtual bool RefreshOnTextChange() const { return false; }
+
+	virtual wxString const& Header() const = 0;
+	virtual wxString const& Description() const = 0;
+
+	virtual wxString Value(const AssDialogue *d, const agi::Context * = nullptr) const = 0;
+	virtual int Width(const agi::Context *c, WidthHelper &helper, bool by_frame) const = 0;
+};
+
+std::vector<std::unique_ptr<GridColumn>> GetGridColumns();
\ No newline at end of file