Fixed crash on assistants and more tweaks to grid

Originally committed to SVN as r70.

core/base_grid.cpp

@@ -129,6 +129,7 @@ void BaseGrid::BeginBatch() {
 // End batch
 void BaseGrid::EndBatch() {
 	//Thaw();
+	AdjustScrollbar();
 }
 
 
@@ -147,8 +148,7 @@ void BaseGrid::MakeCellVisible(int row, int col) {
 
 	// Make visible
 	if (forceCenter || row < minVis || row > maxVis) {
-		yPos = MID(0,row - h/lineHeight/2 + 1,GetRows()+2 - h/lineHeight);
-		scrollBar->SetThumbPosition(yPos);
+		ScrollTo(row - h/lineHeight/2 + 1);
 	}
 }
 
@@ -223,7 +223,9 @@ void BaseGrid::OnPaint (wxPaintEvent &event) {
 	bool direct = false;
 
 	if (direct) {
+		dc.BeginDrawing();
 		DrawImage(dc);
+		dc.EndDrawing();
 	}
 
 	else {
@@ -509,9 +511,7 @@ void BaseGrid::OnMouseEvent(wxMouseEvent &event) {
 		if (row > maxVis) delta = +1;
 
 		// Scroll
-		yPos = MID(0,yPos+delta*3,GetRows()+2 - h/lineHeight);
-		scrollBar->SetThumbPosition(yPos);
-		Refresh(false);
+		ScrollTo(yPos+delta*3);
 	}
 
 	// Click
@@ -566,9 +566,7 @@ void BaseGrid::OnMouseEvent(wxMouseEvent &event) {
 	// Mouse wheel
 	if (event.GetWheelRotation() != 0) {
 		int step = 3 * event.GetWheelRotation() / event.GetWheelDelta();
-		yPos = MID(0,yPos - step,GetRows()+2 - h/lineHeight);
-		scrollBar->SetThumbPosition(yPos);
-		Refresh(false);
+		ScrollTo(yPos - step);
 		return;
 	}
 
@@ -576,21 +574,41 @@ void BaseGrid::OnMouseEvent(wxMouseEvent &event) {
 }
 
 
+/////////////
+// Scroll to
+void BaseGrid::ScrollTo(int y) {
+	int w,h;
+	GetClientSize(&w,&h);
+	int nextY = MID(0,y,GetRows()+2 - h/lineHeight);
+	if (yPos != nextY) {
+		yPos = nextY;
+		if (scrollBar->IsEnabled()) scrollBar->SetThumbPosition(yPos);
+		Refresh(false);
+	}
+}
+
+
 ////////////////////
 // Adjust scrollbar
 void BaseGrid::AdjustScrollbar() {
-	// Set size
+	// Variables
 	int w,h,sw,sh;
 	GetClientSize(&w,&h);
+	int drawPerScreen = h/lineHeight;
+	int rows = GetRows();
+	bool barToEnable = drawPerScreen < rows+2;
+	bool barEnabled = scrollBar->IsEnabled();
+
+	// Set size
 	scrollBar->Freeze();
 	scrollBar->GetSize(&sw,&sh);
 	scrollBar->SetSize(w-sw,0,sw,h);
 
 	// Set parameters
-	int drawPerScreen = h/lineHeight;
-	int rows = GetRows();
-	scrollBar->SetScrollbar(yPos,drawPerScreen,rows+2,drawPerScreen-2,true);
-	scrollBar->Enable(drawPerScreen < rows);
+	if (barEnabled) {
+		scrollBar->SetScrollbar(yPos,drawPerScreen,rows+2,drawPerScreen-2,true);
+	}
+	if (barToEnable != barEnabled) scrollBar->Enable(barToEnable);
 	scrollBar->Thaw();
 }
 

core/base_grid.h

@@ -61,7 +61,6 @@ class BaseGrid : public wxWindow {
 private:
 	int lineHeight;
 	int colWidth[16];
-	int yPos;
 	int lastRow;
 	bool holding;
 	wxFont font;
@@ -73,12 +72,14 @@ private:
 	void OnScroll(wxScrollEvent &event);
 	void OnMouseEvent(wxMouseEvent &event);
 
-	void AdjustScrollbar();
 	void DrawImage(wxDC &dc);
 
 protected:
 	FrameMain *parentFrame;
 	virtual void OnPopupMenu() {}
+	void AdjustScrollbar();
+	void ScrollTo(int y);
+	int yPos;
 
 public:
 	SubsEditBox *editBox;

core/dialog_styling_assistant.cpp

@@ -180,8 +180,9 @@ void DialogStyling::JumpToLine(int n) {
 	if (n == -1) return;
 
 	// Get line
-	line = grid->GetDialogue(n);
-	if (!line) return;
+	AssDialogue *nextLine = grid->GetDialogue(n);
+	if (!nextLine) return;
+	line = nextLine;
 
 	// Set number
 	linen = n;

core/dialog_translation.cpp

@@ -134,12 +134,14 @@ DialogTranslation::DialogTranslation (wxWindow *parent,AssFile *_subs,SubtitlesG
 // Jumps to line at block
 bool DialogTranslation::JumpToLine(int n,int block) {
 	using std::vector;
+	AssDialogue *nextLine;
 	try {
-		current = grid->GetDialogue(n);
+		nextLine = grid->GetDialogue(n);
 	} catch (...) {
 		return false;
 	}
-	if (!current) return false;
+	if (!nextLine) return false;
+	current = nextLine;
 
 	// Count blocks
 	int nblocks = 0;

core/subs_grid.cpp

@@ -814,6 +814,8 @@ void SubtitlesGrid::Clear () {
 	//if (GetNumberRows() > 0) DeleteRows(0,GetNumberRows());
 	diagMap.clear();
 	selMap.clear();
+	yPos = 0;
+	AdjustScrollbar();
 }
 
 
@@ -869,6 +871,7 @@ void SubtitlesGrid::LoadFromAss (AssFile *_ass,bool keepSelection,bool dontModif
 
 	// Finish setting layout
 	EndBatch();
+	AdjustScrollbar();
 
 	// Commit
 	if (!AssFile::Popping) {