Add function to calculate the end time for a subtitle line.

Originally committed to SVN as r5581.

aegisub/src/frame_main.cpp

@@ -409,6 +409,8 @@ void FrameMain::InitMenu() {
 	AppendBitmapMenuItem(timingMenu,Menu_Subs_Snap_End_To_Video, MakeHotkeyText(_("Snap End to Video"), _T("Set End to Video")), _("Set end of selected subtitles to current video frame"), wxBITMAP(subend_to_video));
 	AppendBitmapMenuItem(timingMenu,Menu_Video_Snap_To_Scene, MakeHotkeyText(_("Snap to Scene"), _T("Snap to Scene")), _("Set start and end of subtitles to the keyframes around current video frame"), wxBITMAP(snap_subs_to_scene));
 	AppendBitmapMenuItem(timingMenu,Menu_Video_Shift_To_Frame, MakeHotkeyText(_("Shift to Current Frame"), _T("Shift by Current Time")), _("Shift selection so first selected line starts at current frame"), wxBITMAP(shift_to_frame));
+	timingMenu->Append(Menu_Subs_Calculate_End_Time, _("Calculate End Time for Frame(s)"), _("Calculate end time based on reading speed of 14 chars per second"));
+
 	timingMenu->AppendSeparator();
 	wxMenu *ContinuousMenu = new wxMenu;
 	wxMenuItem *ContinuousParent = new wxMenuItem(subtitlesMenu,-1,_("Make Times Continuous"),_T(""),wxITEM_NORMAL,ContinuousMenu);

aegisub/src/frame_main.h

@@ -226,6 +226,8 @@ private:
 	void OnOpenKanjiTimer (wxCommandEvent &event);
 	void OnOpenVideoDetails (wxCommandEvent &event);
 	void OnOpenASSDraw (wxCommandEvent &event);
+    
+	void OnCalculateEndTime (wxCommandEvent &event);
 
 	void OnOpenOptions (wxCommandEvent &event);
 	void OnOpenLog (wxCommandEvent &event);
@@ -415,6 +417,7 @@ enum {
 	Menu_Subs_Snap_End_To_Video,
 	Menu_Subs_Snap_Video_To_Start,
 	Menu_Subs_Snap_Video_To_End,
+	Menu_Subs_Calculate_End_Time,
 	Menu_Video_Snap_To_Scene,
 	Menu_Video_Shift_To_Frame,
 

aegisub/src/frame_main_events.cpp

@@ -191,6 +191,7 @@ BEGIN_EVENT_TABLE(FrameMain, wxFrame)
 	EVT_MENU(Menu_Subs_Snap_End_To_Video, FrameMain::OnSnapSubsEndToVid)
 	EVT_MENU(Menu_Subs_Snap_Video_To_Start, FrameMain::OnSnapVidToSubsStart)
 	EVT_MENU(Menu_Subs_Snap_Video_To_End, FrameMain::OnSnapVidToSubsEnd)
+	EVT_MENU(Menu_Subs_Calculate_End_Time, FrameMain::OnCalculateEndTime)
 	EVT_MENU(Menu_Video_Snap_To_Scene, FrameMain::OnSnapToScene)
 	EVT_MENU(Menu_Video_Shift_To_Frame, FrameMain::OnShiftToFrame)
 
@@ -1205,6 +1206,13 @@ void FrameMain::OnSnapVidToSubsEnd (wxCommandEvent &event) {
 	}
 }
 
+/// @brief Handler for menu event to calculate the end times of subtitles
+/// @param event 
+///
+void FrameMain::OnCalculateEndTime (wxCommandEvent &event) {
+	if (SubsBox)
+		SubsBox->CalculateEndTimeForLines(SubsBox->GetSelection());
+}
 
 /////////////////
 // Snap to scene

aegisub/src/subs_grid.cpp

@@ -1024,6 +1024,28 @@ void SubtitlesGrid::PasteLines(int n,bool pasteOver) {
 	EndBatch();
 }
 
+/// @brief Calculate the end time for a given set of subtitle strings 
+/// @param lines	   
+///
+void SubtitlesGrid::CalculateEndTimeForLines(wxArrayInt lines)
+{
+	AssDialogue *cur;
+	int nrows = lines.Count();
+	float charsPerSecond = 14.0;
+	for (int i=0;i<nrows;i++) {
+		int row = lines[i];
+		cur = GetDialogue(row);
+		int start = cur->Start.GetMS();
+		wxString text = cur->GetStrippedText();
+		float seconds = (float)text.Length() / charsPerSecond;
+		int lenms = seconds * 1000;
+		// make sure very short subtitles stay on for at least a second
+		if (lenms < 1000)
+			lenms = 1000;
+		cur->End.SetMS(start + lenms);
+	}
+	CommitChanges();
+}
 
 /////////////////////////
 // Delete selected lines

aegisub/src/subs_grid.h

@@ -133,6 +133,8 @@ public:
 	void CopyLines(wxArrayInt lines);
 	void CutLines(wxArrayInt lines);
 	void PasteLines(int pos,bool over=false);
+  
+	void CalculateEndTimeForLines(wxArrayInt lines);
 
 	std::vector<int> GetAbsoluteSelection();
 	void SetSelectionFromAbsolute(std::vector<int> &selection);