Extract SelectionController from BaseGrid

build/Aegisub/Aegisub.vcxproj

@@ -390,6 +390,7 @@
     <ClCompile Include="$(SrcDir)scintilla_text_ctrl.cpp" />
     <ClCompile Include="$(SrcDir)scintilla_text_selection_controller.cpp" />
     <ClCompile Include="$(SrcDir)search_replace_engine.cpp" />
+    <ClCompile Include="$(SrcDir)selection_controller.cpp" />
     <ClCompile Include="$(SrcDir)spellchecker.cpp" />
     <ClCompile Include="$(SrcDir)spellchecker_hunspell.cpp" />
     <ClCompile Include="$(SrcDir)spline.cpp" />

build/Aegisub/Aegisub.vcxproj.filters

@@ -1001,6 +1001,9 @@
     <ClCompile Include="$(SrcDir)base_grid.cpp">
       <Filter>Main UI\Grid</Filter>
     </ClCompile>
+    <ClCompile Include="$(SrcDir)selection_controller.cpp">
+      <Filter>Main UI\Grid</Filter>
+    </ClCompile>
     <ClCompile Include="$(SrcDir)scintilla_text_ctrl.cpp">
       <Filter>Main UI\Edit box</Filter>
     </ClCompile>

src/Makefile

@@ -209,6 +209,7 @@ SRC += \
 	scintilla_text_ctrl.cpp \
 	scintilla_text_selection_controller.cpp \
 	search_replace_engine.cpp \
+	selection_controller.cpp \
 	spellchecker.cpp \
 	spline.cpp \
 	spline_curve.cpp \

src/ass_karaoke.cpp

@@ -277,7 +277,7 @@ void AssKaraoke::SplitLines(std::set<AssDialogue*> const& lines, agi::Context *c
 
 	AssKaraoke kara;
 
-	SubtitleSelection sel = c->selectionController->GetSelectedSet();
+	Selection sel = c->selectionController->GetSelectedSet();
 
 	bool did_split = false;
 	for (auto it = c->ass->Events.begin(); it != c->ass->Events.end(); ++it) {

src/audio_timing.h

@@ -38,7 +38,6 @@ class AudioRenderingStyleRanges;
 namespace agi { struct Context; }
 
 #include "audio_marker.h"
-#include "selection_controller.h"
 
 /// @class AudioTimingController
 /// @brief Base class for objects controlling audio timing

src/audio_timing_dialogue.cpp

@@ -348,7 +348,7 @@ class AudioTimingControllerDialogue final : public AudioTimingController {
 	void RegenerateSelectedLines();
 
 	/// Add a line to the list of timeable inactive lines
-	void AddInactiveLine(SubtitleSelection const& sel, AssDialogue *diag);
+	void AddInactiveLine(Selection const& sel, AssDialogue *diag);
 
 	/// Regenerate the list of active and inactive line markers
 	void RegenerateMarkers();
@@ -727,7 +727,7 @@ void AudioTimingControllerDialogue::RegenerateInactiveLines()
 	bool was_empty = inactive_lines.empty();
 	inactive_lines.clear();
 
-	SubtitleSelection const& sel = context->selectionController->GetSelectedSet();
+	auto const& sel = context->selectionController->GetSelectedSet();
 
 	switch (int mode = inactive_line_mode->GetInt())
 	{
@@ -778,7 +778,7 @@ void AudioTimingControllerDialogue::RegenerateInactiveLines()
 	RegenerateMarkers();
 }
 
-void AudioTimingControllerDialogue::AddInactiveLine(SubtitleSelection const& sel, AssDialogue *diag)
+void AudioTimingControllerDialogue::AddInactiveLine(Selection const& sel, AssDialogue *diag)
 {
 	if (sel.count(diag)) return;
 

src/audio_timing_karaoke.cpp

@@ -33,6 +33,7 @@
 #include "include/aegisub/context.h"
 #include "options.h"
 #include "pen.h"
+#include "selection_controller.h"
 #include "utils.h"
 
 #include <deque>

src/auto4_lua.cpp

@@ -834,7 +834,7 @@ namespace Automation4 {
 
 	static int transform_selection(lua_State *L, const agi::Context *c)
 	{
-		SubtitleSelection const& sel = c->selectionController->GetSelectedSet();
+		auto const& sel = c->selectionController->GetSelectedSet();
 		AssDialogue *active_line = c->selectionController->GetActiveLine();
 
 		lua_newtable(L);

src/base_grid.cpp

@@ -48,6 +48,7 @@
 #include "frame_main.h"
 #include "options.h"
 #include "utils.h"
+#include "selection_controller.h"
 #include "subs_controller.h"
 #include "video_context.h"
 #include "video_slider.h"
@@ -89,8 +90,8 @@ namespace std {
 	};
 }
 
-BaseGrid::BaseGrid(wxWindow* parent, agi::Context *context, const wxSize& size, long style, const wxString& name)
+BaseGrid::BaseGrid(wxWindow* parent, agi::Context *context)
-: wxWindow(parent, -1, wxDefaultPosition, size, style, name)
+: 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)))
 , context(context)
@@ -108,26 +109,30 @@ BaseGrid::BaseGrid(wxWindow* parent, agi::Context *context, const wxSize& size,
 	UpdateStyle();
 	OnHighlightVisibleChange(*OPT_GET("Subtitle/Grid/Highlight Subtitles in Frame"));
 
-	OPT_SUB("Subtitle/Grid/Font Face", &BaseGrid::UpdateStyle, this);
+	connections.push_back(context->ass->AddCommitListener(&BaseGrid::OnSubtitlesCommit, this));
-	OPT_SUB("Subtitle/Grid/Font Size", &BaseGrid::UpdateStyle, this);
+	connections.push_back(context->subsController->AddFileOpenListener(&BaseGrid::OnSubtitlesOpen, this));
-	OPT_SUB("Subtitle/Grid/Highlight Subtitles in Frame", &BaseGrid::OnHighlightVisibleChange, this);
+	connections.push_back(context->subsController->AddFileSaveListener(&BaseGrid::OnSubtitlesSave, this));
-	context->ass->AddCommitListener(&BaseGrid::OnSubtitlesCommit, this);
-	context->subsController->AddFileOpenListener(&BaseGrid::OnSubtitlesOpen, this);
-	context->subsController->AddFileSaveListener(&BaseGrid::OnSubtitlesSave, this);
 
-	OPT_SUB("Colour/Subtitle Grid/Active Border", &BaseGrid::UpdateStyle, this);
+	connections.push_back(context->selectionController->AddActiveLineListener(&BaseGrid::OnActiveLineChanged, this));
-	OPT_SUB("Colour/Subtitle Grid/Background/Background", &BaseGrid::UpdateStyle, this);
+	connections.push_back(context->selectionController->AddSelectionListener([&]{ Refresh(false); }));
-	OPT_SUB("Colour/Subtitle Grid/Background/Comment", &BaseGrid::UpdateStyle, this);
+
-	OPT_SUB("Colour/Subtitle Grid/Background/Inframe", &BaseGrid::UpdateStyle, this);
+	connections.push_back(OPT_SUB("Subtitle/Grid/Font Face", &BaseGrid::UpdateStyle, this));
-	OPT_SUB("Colour/Subtitle Grid/Background/Selected Comment", &BaseGrid::UpdateStyle, this);
+	connections.push_back(OPT_SUB("Subtitle/Grid/Font Size", &BaseGrid::UpdateStyle, this));
-	OPT_SUB("Colour/Subtitle Grid/Background/Selection", &BaseGrid::UpdateStyle, this);
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Active Border", &BaseGrid::UpdateStyle, this));
-	OPT_SUB("Colour/Subtitle Grid/Collision", &BaseGrid::UpdateStyle, this);
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Background/Background", &BaseGrid::UpdateStyle, this));
-	OPT_SUB("Colour/Subtitle Grid/Header", &BaseGrid::UpdateStyle, this);
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Background/Comment", &BaseGrid::UpdateStyle, this));
-	OPT_SUB("Colour/Subtitle Grid/Left Column", &BaseGrid::UpdateStyle, this);
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Background/Inframe", &BaseGrid::UpdateStyle, this));
-	OPT_SUB("Colour/Subtitle Grid/Lines", &BaseGrid::UpdateStyle, this);
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Background/Selected Comment", &BaseGrid::UpdateStyle, this));
-	OPT_SUB("Colour/Subtitle Grid/Selection", &BaseGrid::UpdateStyle, this);
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Background/Selection", &BaseGrid::UpdateStyle, this));
-	OPT_SUB("Colour/Subtitle Grid/Standard", &BaseGrid::UpdateStyle, this);
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Collision", &BaseGrid::UpdateStyle, this));
-	OPT_SUB("Subtitle/Grid/Hide Overrides", std::bind(&BaseGrid::Refresh, this, false, nullptr));
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Header", &BaseGrid::UpdateStyle, this));
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Left Column", &BaseGrid::UpdateStyle, this));
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Lines", &BaseGrid::UpdateStyle, this));
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Selection", &BaseGrid::UpdateStyle, this));
+	connections.push_back(OPT_SUB("Colour/Subtitle Grid/Standard", &BaseGrid::UpdateStyle, this));
+
+	connections.push_back(OPT_SUB("Subtitle/Grid/Highlight Subtitles in Frame", &BaseGrid::OnHighlightVisibleChange, this));
+	connections.push_back(OPT_SUB("Subtitle/Grid/Hide Overrides", [&](agi::OptionValue const&) { Refresh(false); }));
 
 	Bind(wxEVT_CONTEXT_MENU, &BaseGrid::OnContextMenu, this);
 }
@@ -155,34 +160,16 @@ void BaseGrid::OnSubtitlesCommit(int type) {
 	}
 	if (type & AssFile::COMMIT_DIAG_TIME)
 		Refresh(false);
-		//RefreshRect(wxRect(time_cols_x, 0, time_cols_w, GetClientSize().GetHeight()), false);
 	else if (type & AssFile::COMMIT_DIAG_TEXT)
 		RefreshRect(wxRect(text_col_x, 0, text_col_w, GetClientSize().GetHeight()), false);
 }
 
 void BaseGrid::OnSubtitlesOpen() {
-	BeginBatch();
-	ClearMaps();
-	UpdateMaps();
-
-	if (GetRows()) {
-		int row = context->ass->GetUIStateAsInt("Active Line");
-		if (row < 0 || row >= GetRows())
-			row = 0;
-
-		SetActiveLine(GetDialogue(row));
-		SelectRow(row);
-	}
-
 	ScrollTo(context->ass->GetUIStateAsInt("Scroll Position"));
-
-	EndBatch();
-	SetColumnWidths();
 }
 
 void BaseGrid::OnSubtitlesSave() {
 	context->ass->SaveUIState("Scroll Position", std::to_string(yPos));
-	context->ass->SaveUIState("Active Line", std::to_string(GetDialogueIndex(active_line)));
 }
 
 void BaseGrid::OnShowColMenu(wxCommandEvent &event) {
@@ -239,20 +226,7 @@ void BaseGrid::UpdateStyle() {
 	Refresh(false);
 }
 
-void BaseGrid::ClearMaps() {
-	index_line_map.clear();
-	line_index_map.clear();
-	selection.clear();
-	yPos = 0;
-	AdjustScrollbar();
-
-	AnnounceSelectedSetChanged();
-}
-
 void BaseGrid::UpdateMaps() {
-	BeginBatch();
-	int active_row = line_index_map[active_line];
-
 	index_line_map.clear();
 	line_index_map.clear();
 
@@ -261,47 +235,17 @@ void BaseGrid::UpdateMaps() {
 		index_line_map.push_back(&curdiag);
 	}
 
-	auto sorted = index_line_map;
-	sort(begin(sorted), end(sorted));
-	Selection new_sel;
-	// Remove lines which no longer exist from the selection
-	set_intersection(selection.begin(), selection.end(),
-		sorted.begin(), sorted.end(),
-		inserter(new_sel, new_sel.begin()));
-
-	SetSelectedSet(std::move(new_sel));
-
-	// The active line may have ceased to exist; pick a new one if so
-	if (line_index_map.size() && !line_index_map.count(active_line))
-		SetActiveLine(index_line_map[std::min((size_t)active_row, index_line_map.size() - 1)]);
-
-	if (selection.empty() && active_line)
-		SetSelectedSet({ active_line });
-
-	EndBatch();
-
 	SetColumnWidths();
-
 	Refresh(false);
 }
 
-void BaseGrid::BeginBatch() {
+void BaseGrid::OnActiveLineChanged(AssDialogue *new_active) {
-	++batch_level;
+	if (new_active) {
-}
+		int row = GetDialogueIndex(new_active);
-
+		MakeRowVisible(row);
-void BaseGrid::EndBatch() {
+		extendRow = row;
-	--batch_level;
+		Refresh(false);
-	assert(batch_level >= 0);
-	if (batch_level == 0) {
-		if (batch_active_line_changed)
-			AnnounceActiveLineChanged(active_line);
-		batch_active_line_changed = false;
-		if (batch_selection_changed)
-			AnnounceSelectedSetChanged();
-		batch_selection_changed = false;
 	}
-
-	AdjustScrollbar();
 }
 
 void BaseGrid::MakeRowVisible(int row) {
@@ -319,23 +263,19 @@ void BaseGrid::SelectRow(int row, bool addToSelected, bool select) {
 	AssDialogue *line = index_line_map[row];
 
 	if (!addToSelected) {
-		Selection sel;
+		context->selectionController->SetSelectedSet(Selection{line});
-		if (select) sel.insert(line);
-		SetSelectedSet(std::move(sel));
 		return;
 	}
 
-	if (select && selection.find(line) == selection.end()) {
+	bool selected = !!context->selectionController->GetSelectedSet().count(line);
-		selection.insert(line);
+	if (select != selected) {
-		AnnounceSelectedSetChanged();
+		auto selection = context->selectionController->GetSelectedSet();
+		if (select)
+			selection.insert(line);
+		else
+			selection.erase(line);
+		context->selectionController->SetSelectedSet(std::move(selection));
 	}
-	else if (!select && selection.find(line) != selection.end()) {
-		selection.erase(line);
-		AnnounceSelectedSetChanged();
-	}
-
-	int w = GetClientSize().GetWidth();
-	RefreshRect(wxRect(0, (row + 1 - yPos) * lineHeight, w, lineHeight), false);
 }
 
 void BaseGrid::OnPaint(wxPaintEvent &) {
@@ -401,9 +341,13 @@ void BaseGrid::DrawImage(wxDC &dc, bool paint_columns[]) {
 	if (override_mode == 1)
 		replace_char = to_wx(OPT_GET("Subtitle/Grid/Hide Overrides Char")->GetString());
 
+	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;
 		RowColor curColor = COLOR_DEFAULT;
+		AssDialogue *curDiag = nullptr;
 
 		// Header
 		if (i == 0) {
@@ -411,7 +355,7 @@ void BaseGrid::DrawImage(wxDC &dc, bool paint_columns[]) {
 			dc.SetTextForeground(text_standard);
 		}
 		// Lines
-		else if (AssDialogue *curDiag = GetDialogue(curRow)) {
+		else if ((curDiag = GetDialogue(curRow))) {
 			GetRowStrings(curRow, curDiag, paint_columns, strings, !!override_mode, replace_char);
 
 			bool inSel = !!selection.count(curDiag);
@@ -467,28 +411,27 @@ void BaseGrid::DrawImage(wxDC &dc, bool paint_columns[]) {
 
 		// Draw grid
 		dc.DestroyClippingRegion();
-		dc.SetPen(grid_pen);
+		if (curDiag == active_line) {
-		dc.DrawLine(0,dy+lineHeight,w,dy+lineHeight);
+			dc.SetPen(wxPen(to_wx(OPT_GET("Colour/Subtitle Grid/Active Border")->GetColor())));
+			dc.SetBrush(*wxTRANSPARENT_BRUSH);
+			dc.DrawRectangle(0, dy, w, lineHeight + 1);
+		}
+		else {
+			dc.SetPen(grid_pen);
+			dc.DrawLine(0, dy + lineHeight, w , dy + lineHeight);
+		}
 		dc.SetPen(*wxTRANSPARENT_PEN);
 	}
 
 	// Draw grid columns
 	int dx = 0;
 	dc.SetPen(grid_pen);
-	for (int i=0;i<10;i++) {
+	for (int i = 0; i < 10; ++i) {
 		dx += colWidth[i];
-		dc.DrawLine(dx,0,dx,maxH);
+		dc.DrawLine(dx, 0, dx, maxH);
-	}
-	dc.DrawLine(0,0,0,maxH);
-	dc.DrawLine(w-1,0,w-1,maxH);
-
-	// Draw currently active line border
-	if (GetActiveLine()) {
-		dc.SetPen(wxPen(to_wx(OPT_GET("Colour/Subtitle Grid/Active Border")->GetColor())));
-		dc.SetBrush(*wxTRANSPARENT_BRUSH);
-		int dy = (line_index_map[GetActiveLine()]+1-yPos) * lineHeight;
-		dc.DrawRectangle(0,dy,w,lineHeight+1);
 	}
+	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 {
@@ -604,8 +547,11 @@ void BaseGrid::OnMouseEvent(wxMouseEvent &event) {
 		// but we don't want to scroll until the mouse moves or the button is
 		// released, to avoid selecting multiple lines on a click
 		int old_y_pos = yPos;
-		SetActiveLine(dlg);
+		context->selectionController->SetActiveLine(dlg);
 		ScrollTo(old_y_pos);
+		extendRow = row;
+
+		auto const& selection = context->selectionController->GetSelectedSet();
 
 		// Toggle selected
 		if (click && ctrl && !shift && !alt) {
@@ -643,7 +589,7 @@ void BaseGrid::OnMouseEvent(wxMouseEvent &event) {
 			if (ctrl) newsel = selection;
 			for (int i = i1; i <= i2; i++)
 				newsel.insert(GetDialogue(i));
-			SetSelectedSet(std::move(newsel));
+			context->selectionController->SetSelectedSet(std::move(newsel));
 			return;
 		}
 
@@ -830,7 +776,6 @@ void BaseGrid::SetColumnWidths() {
 			colWidth[i] += 10;
 	}
 
-
 	// Set size of last
 	int total = std::accumulate(colWidth, colWidth + 10, 0);
 	colWidth[10] = std::max(w - total, 0);
@@ -911,8 +856,8 @@ void BaseGrid::OnKeyDown(wxKeyEvent &event) {
 	}
 
 	int old_extend = extendRow;
-	int next = mid(0, GetDialogueIndex(active_line) + dir * step, GetRows() - 1);
+	int next = mid(0, GetDialogueIndex(context->selectionController->GetActiveLine()) + dir * step, GetRows() - 1);
-	SetActiveLine(GetDialogue(next));
+	context->selectionController->SetActiveLine(GetDialogue(next));
 
 	// Move selection
 	if (!ctrl && !shift && !alt) {
@@ -921,10 +866,8 @@ void BaseGrid::OnKeyDown(wxKeyEvent &event) {
 	}
 
 	// Move active only
-	if (alt && !shift && !ctrl) {
+	if (alt && !shift && !ctrl)
-		Refresh(false);
 		return;
-	}
 
 	// Shift-selection
 	if (shift && !ctrl && !alt) {
@@ -940,7 +883,7 @@ void BaseGrid::OnKeyDown(wxKeyEvent &event) {
 		for (int i = begin; i <= end; i++)
 			newsel.insert(GetDialogue(i));
 
-		SetSelectedSet(std::move(newsel));
+		context->selectionController->SetSelectedSet(std::move(newsel));
 
 		MakeRowVisible(next);
 		return;
@@ -953,59 +896,3 @@ void BaseGrid::SetByFrame(bool state) {
 	SetColumnWidths();
 	Refresh(false);
 }
-
-void BaseGrid::SetSelectedSet(Selection new_selection) {
-	selection = std::move(new_selection);
-	AnnounceSelectedSetChanged();
-	Refresh(false);
-}
-
-void BaseGrid::SetActiveLine(AssDialogue *new_line) {
-	if (new_line != active_line) {
-		assert(new_line == nullptr || line_index_map.count(new_line));
-		active_line = new_line;
-		AnnounceActiveLineChanged(active_line);
-		MakeRowVisible(GetDialogueIndex(active_line));
-		Refresh(false);
-	}
-	// extendRow may not equal the active row if it was set via a shift-click,
-	// so update it even if the active line didn't change
-	extendRow = GetDialogueIndex(new_line);
-}
-
-void BaseGrid::SetSelectionAndActive(Selection new_selection, AssDialogue *new_line) {
-	BeginBatch();
-	SetSelectedSet(std::move(new_selection));
-	SetActiveLine(new_line);
-	EndBatch();
-}
-
-void BaseGrid::PrevLine() {
-	if (!active_line) return;
-	auto it = context->ass->Events.iterator_to(*active_line);
-	if (it != context->ass->Events.begin()) {
-		--it;
-		SetSelectionAndActive({&*it}, &*it);
-	}
-}
-
-void BaseGrid::NextLine() {
-	if (!active_line) return;
-	auto it = context->ass->Events.iterator_to(*active_line);
-	if (++it != context->ass->Events.end())
-		SetSelectionAndActive({&*it}, &*it);
-}
-
-void BaseGrid::AnnounceActiveLineChanged(AssDialogue *new_line) {
-	if (batch_level > 0)
-		batch_active_line_changed = true;
-	else
-		SubtitleSelectionController::AnnounceActiveLineChanged(new_line);
-}
-
-void BaseGrid::AnnounceSelectedSetChanged() {
-	if (batch_level > 0)
-		batch_selection_changed = true;
-	else
-		SubtitleSelectionController::AnnounceSelectedSetChanged();
-}

src/base_grid.h

@@ -32,8 +32,6 @@
 /// @ingroup main_ui
 ///
 
-#pragma once
-
 #include <libaegisub/signal.h>
 
 #include <map>
@@ -41,15 +39,14 @@
 #include <vector>
 #include <wx/window.h>
 
-#include "selection_controller.h"
-
 namespace agi {
 	struct Context;
 	class OptionValue;
 }
 class AssDialogue;
 
-class BaseGrid final : public wxWindow, public SubtitleSelectionController {
+class BaseGrid final : public wxWindow {
+	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?
 	wxFont font;            ///< Current grid font
@@ -61,19 +58,9 @@ class BaseGrid final : public wxWindow, public SubtitleSelectionController {
 	/// keyboard, shift-clicking or dragging
 	int extendRow = -1;
 
-	Selection selection; ///< Currently selected lines
-	AssDialogue *active_line = nullptr; ///< The currently active line or 0 if none
 	std::vector<AssDialogue*> index_line_map;  ///< Row number -> dialogue line
 	std::map<AssDialogue*,int> line_index_map; ///< Dialogue line -> row number
 
-	/// Selection batch nesting depth; changes are commited only when this
-	/// hits zero
-	int batch_level = 0;
-	/// Has the active line been changed in the current batch?
-	bool batch_active_line_changed = false;
-	/// Has the selection been changed in the current batch?
-	bool batch_selection_changed = false;
-
 	/// Connection for video seek event. Stored explicitly so that it can be
 	/// blocked if the relevant option is disabled
 	agi::signal::Connection seek_listener;
@@ -93,6 +80,7 @@ class BaseGrid final : public wxWindow, public SubtitleSelectionController {
 	void OnSubtitlesCommit(int type);
 	void OnSubtitlesOpen();
 	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;
@@ -115,35 +103,15 @@ class BaseGrid final : public wxWindow, public SubtitleSelectionController {
 
 	bool IsDisplayed(const AssDialogue *line) const;
 
-	// Re-implement functions from BaseSelectionController to add batching
-	void AnnounceActiveLineChanged(AssDialogue *new_line);
-	void AnnounceSelectedSetChanged();
-
-protected:
 	agi::Context *context; ///< Current project context
 
-public:
-	// SelectionController implementation
-	void SetActiveLine(AssDialogue *new_line) override;
-	AssDialogue * GetActiveLine() const override { return active_line; }
-	void SetSelectedSet(Selection new_selection) override;
-	void GetSelectedSet(Selection &res) const override { res = selection; }
-	Selection const& GetSelectedSet() const override { return selection; }
-	void SetSelectionAndActive(Selection new_selection, AssDialogue *new_line) override;;
-	void NextLine() override;
-	void PrevLine() override;
-
-	void BeginBatch();
-	void EndBatch();
-	void SetByFrame(bool state);
-
-	void SelectRow(int row, bool addToSelected = false, bool select=true);
-
 	void ClearMaps();
 	/// @brief Update the row <-> AssDialogue mappings
 	void UpdateMaps();
 	void UpdateStyle();
 
+	void SelectRow(int row, bool addToSelected = false, bool select=true);
+
 	int GetRows() const { return index_line_map.size(); }
 	void MakeRowVisible(int row);
 
@@ -157,8 +125,11 @@ public:
 	/// @return Subtitle index for object, or -1 if unknown subtitle
 	int GetDialogueIndex(AssDialogue *diag) const;
 
-	BaseGrid(wxWindow* parent, agi::Context *context, const wxSize& size = wxDefaultSize, long style = wxWANTS_CHARS, const wxString& name = wxPanelNameStr);
+public:
+	BaseGrid(wxWindow* parent, agi::Context *context);
 	~BaseGrid();
 
+	void SetByFrame(bool state);
+
 	DECLARE_EVENT_TABLE()
 };

src/command/audio.cpp

@@ -195,7 +195,7 @@ struct audio_save_clip final : public Command {
 	}
 
 	void operator()(agi::Context *c) override {
-		SubtitleSelection const& sel = c->selectionController->GetSelectedSet();
+		auto const& sel = c->selectionController->GetSelectedSet();
 		if (sel.empty()) return;
 
 		AssTime start = INT_MAX, end = 0;

src/command/edit.cpp

@@ -101,7 +101,7 @@ void paste_lines(agi::Context *c, bool paste_over, Paster&& paste_line) {
 	if (data.empty()) return;
 
 	AssDialogue *first = nullptr;
-	SubtitleSelection newsel;
+	Selection newsel;
 
 	boost::char_separator<char> sep("\r\n");
 	for (auto curdata : boost::tokenizer<boost::char_separator<char>>(data, sep)) {
@@ -270,7 +270,7 @@ void set_tag(AssDialogue *line, boost::ptr_vector<AssDialogueBlock> &blocks, std
 }
 
 void commit_text(agi::Context const * const c, wxString const& desc, int sel_start = -1, int sel_end = -1, int *commit_id = nullptr) {
-	SubtitleSelection const& sel = c->selectionController->GetSelectedSet();
+	auto const& sel = c->selectionController->GetSelectedSet();
 	std::string text = c->selectionController->GetActiveLine()->Text;
 	for_each(sel.begin(), sel.end(), [&](AssDialogue *d) { d->Text = text; });
 
@@ -488,7 +488,7 @@ struct edit_find_replace final : public Command {
 
 static std::string get_entry_data(AssDialogue &d) { return d.GetEntryData(); }
 static void copy_lines(agi::Context *c) {
-	SubtitleSelection const& sel = c->selectionController->GetSelectedSet();
+	auto const& sel = c->selectionController->GetSelectedSet();
 	SetClipboard(join(c->ass->Events
 		| filtered([&](AssDialogue &d) { return sel.count(&d); })
 		| transformed(get_entry_data),
@@ -496,7 +496,7 @@ static void copy_lines(agi::Context *c) {
 }
 
 static void delete_lines(agi::Context *c, wxString const& commit_message) {
-	SubtitleSelection const& sel = c->selectionController->GetSelectedSet();
+	auto const& sel = c->selectionController->GetSelectedSet();
 
 	// Find a line near the active line not being deleted to make the new active line
 	AssDialogue *pre_sel = nullptr;
@@ -595,7 +595,7 @@ static void duplicate_lines(agi::Context *c, int shift) {
 	auto const& sel = c->selectionController->GetSelectedSet();
 	auto in_selection = [&](AssDialogue const& d) { return sel.count(const_cast<AssDialogue *>(&d)); };
 
-	SubtitleSelectionController::Selection new_sel;
+	Selection new_sel;
 	AssDialogue *new_active = nullptr;
 
 	auto start = c->ass->Events.begin();
@@ -693,7 +693,7 @@ struct edit_line_duplicate_shift_back final : public validate_video_and_sel_none
 };
 
 static void combine_lines(agi::Context *c, void (*combiner)(AssDialogue *, AssDialogue *), wxString const& message) {
-	SubtitleSelection const& sel = c->selectionController->GetSelectedSet();
+	auto const& sel = c->selectionController->GetSelectedSet();
 
 	AssDialogue *first = nullptr;
 	for (auto it = c->ass->Events.begin(); it != c->ass->Events.end(); ) {
@@ -776,7 +776,7 @@ static bool try_paste_lines(agi::Context *c) {
 	}
 
 	AssDialogue *new_active = &*parsed.begin();
-	SubtitleSelection new_selection;
+	Selection new_selection;
 	for (auto& line : parsed)
 		new_selection.insert(&line);
 
@@ -975,7 +975,7 @@ struct edit_line_recombine final : public validate_sel_multiple {
 		}
 
 		// Remove now non-existent lines from the selection
-		SubtitleSelection lines, new_sel;
+		Selection lines, new_sel;
 		boost::copy(c->ass->Events | agi::address_of, inserter(lines, lines.begin()));
 		boost::set_intersection(lines, sel_set, inserter(new_sel, new_sel.begin()));
 

src/command/grid.cpp

@@ -389,7 +389,7 @@ struct grid_swap final : public Command {
 	}
 
 	void operator()(agi::Context *c) override {
-		SubtitleSelection const& sel = c->selectionController->GetSelectedSet();
+		auto const& sel = c->selectionController->GetSelectedSet();
 		if (sel.size() == 2) {
 			(*sel.begin())->swap_nodes(**sel.rbegin());
 			c->ass->Commit(_("swap lines"), AssFile::COMMIT_ORDER);

src/command/subtitle.cpp

@@ -372,7 +372,7 @@ struct subtitle_select_all final : public Command {
 	STR_HELP("Select all dialogue lines")
 
 	void operator()(agi::Context *c) override {
-		SubtitleSelection sel;
+		Selection sel;
 		boost::copy(c->ass->Events | agi::address_of, inserter(sel, sel.end()));
 		c->selectionController->SetSelectedSet(std::move(sel));
 	}
@@ -390,7 +390,7 @@ struct subtitle_select_visible final : public Command {
 		if (!c->videoController->IsLoaded()) return;
 		c->videoController->Stop();
 
-		SubtitleSelectionController::Selection new_selection;
+		Selection new_selection;
 		int frame = c->videoController->GetFrameN();
 
 		for (auto& diag : c->ass->Events) {

src/command/time.cpp

@@ -62,7 +62,7 @@ namespace {
 	struct validate_adjoinable : public Command {
 		CMD_TYPE(COMMAND_VALIDATE)
 		bool Validate(const agi::Context *c) override {
-			SubtitleSelection const& sel = c->selectionController->GetSelectedSet();
+			auto const& sel = c->selectionController->GetSelectedSet();
 			if (sel.size() < 2) return !sel.empty();
 
 			size_t found = 0;
@@ -138,8 +138,8 @@ struct time_frame_current final : public validate_video_loaded {
 	void operator()(agi::Context *c) override {
 		if (!c->videoController->IsLoaded()) return;
 
-		SubtitleSelection const& sel = c->selectionController->GetSelectedSet();
+		auto const& sel = c->selectionController->GetSelectedSet();
-		const AssDialogue *active_line = c->selectionController->GetActiveLine();
+		const auto active_line = c->selectionController->GetActiveLine();
 
 		if (sel.empty() || !active_line) return;
 
@@ -168,7 +168,7 @@ struct time_shift final : public Command {
 };
 
 static void snap_subs_video(agi::Context *c, bool set_start) {
-	SubtitleSelection const& sel = c->selectionController->GetSelectedSet();
+	auto const& sel = c->selectionController->GetSelectedSet();
 
 	if (!c->videoController->IsLoaded() || sel.empty()) return;
 

src/dialog_selection.cpp

@@ -186,7 +186,7 @@ void DialogSelection::Process(wxCommandEvent&) {
 
 	auto action = static_cast<Action>(selection_change_type->GetSelection());
 
-	SubtitleSelection old_sel, new_sel;
+	Selection old_sel, new_sel;
 	if (action != Action::SET)
 		con->selectionController->GetSelectedSet(old_sel);
 

src/dialog_shift_times.cpp

@@ -31,6 +31,7 @@
 #include "help_button.h"
 #include "libresrc/libresrc.h"
 #include "options.h"
+#include "selection_controller.h"
 #include "subs_controller.h"
 #include "timeedit_ctrl.h"
 #include "video_context.h"
@@ -331,7 +332,7 @@ void DialogShiftTimes::Process(wxCommandEvent &) {
 	bool start = type != 2;
 	bool end = type != 1;
 
-	SubtitleSelection const& sel = context->selectionController->GetSelectedSet();
+	auto const& sel = context->selectionController->GetSelectedSet();
 
 	long shift;
 	if (by_time) {

src/dialog_shift_times.h

@@ -19,8 +19,6 @@
 /// @ingroup secondary_ui
 ///
 
-#include "selection_controller.h"
-
 #include <libaegisub/fs_fwd.h>
 #include <libaegisub/signal.h>
 #include <libaegisub/vfr.h>

src/dialog_styling_assistant.cpp

@@ -35,6 +35,7 @@
 #include "help_button.h"
 #include "libresrc/libresrc.h"
 #include "persist_location.h"
+#include "selection_controller.h"
 #include "video_context.h"
 
 #include <libaegisub/util.h>

src/dialog_styling_assistant.h

@@ -14,12 +14,7 @@
 //
 // Aegisub Project http://www.aegisub.org/
 
-/// @file dialog_styling_assistant.h
+#include <libaegisub/signal.h>
-/// @see dialog_styling_assistant.cpp
-/// @ingroup tools_ui
-///
-
-#include "selection_controller.h"
 
 #include <memory>
 #include <wx/dialog.h>

src/frame_main.cpp

@@ -35,11 +35,6 @@
 
 #include "frame_main.h"
 
-#include <libaegisub/fs.h>
-#include <libaegisub/log.h>
-#include <libaegisub/path.h>
-#include <libaegisub/util.h>
-
 #include "include/aegisub/context.h"
 #include "include/aegisub/menu.h"
 #include "include/aegisub/toolbar.h"
@@ -61,6 +56,7 @@
 #include "libresrc/libresrc.h"
 #include "main.h"
 #include "options.h"
+#include "selection_controller.h"
 #include "search_replace_engine.h"
 #include "subs_controller.h"
 #include "subs_edit_box.h"
@@ -72,6 +68,11 @@
 #include "video_display.h"
 #include "video_slider.h"
 
+#include <libaegisub/fs.h>
+#include <libaegisub/log.h>
+#include <libaegisub/path.h>
+#include <libaegisub/util.h>
+
 #include <boost/algorithm/string/predicate.hpp>
 
 #include <wx/dnd.h>
@@ -82,7 +83,7 @@
 #include <wx/sysopt.h>
 
 enum {
-	ID_APP_TIMER_STATUSCLEAR				= 12002
+	ID_APP_TIMER_STATUSCLEAR = 12002
 };
 
 #ifdef WITH_STARTUPLOG
@@ -220,8 +221,8 @@ FrameMain::FrameMain()
 
 	context->local_scripts = new Automation4::LocalScriptManager(context.get());
 
-	// Initialized later due to that the selection controller is currently the subtitles grid
+	context->selectionController = new SelectionController(context.get());
-	context->selectionController = nullptr;
+	context->subsController->SetSelectionController(context->selectionController);
 
 	context->videoController = VideoContext::Get(); // derp
 	context->videoController->AddVideoOpenListener(&FrameMain::OnVideoOpen, this);
@@ -264,7 +265,6 @@ FrameMain::FrameMain()
 
 	StartupLog("Complete context initialization");
 	context->videoController->SetContext(context.get());
-	context->subsController->SetSelectionController(context->selectionController);
 
 	StartupLog("Set up drag/drop target");
 	SetDropTarget(new AegisubFileDropTarget(this));
@@ -302,40 +302,13 @@ FrameMain::FrameMain()
 	StartupLog("Leaving FrameMain constructor");
 }
 
-/// @brief Delete everything but @a keep and its parents
-/// @param window Root window to delete the children of
-/// @param keep Window to keep alive
-/// @return Was @a keep found?
-static bool delete_children(wxWindow *window, wxWindow *keep) {
-	bool found = false;
-	while (window->GetChildren().size() > (size_t)found) {
-		auto it = window->GetChildren().begin();
-
-		if (*it == keep)
-			found = true;
-
-		if (found) {
-			if (++it != window->GetChildren().end())
-				(*it)->wxWindowBase::Destroy();
-		}
-		else if (!delete_children(*it, keep))
-			(*it)->wxWindowBase::Destroy();
-		else
-			found = true;
-	}
-	return found;
-}
-
 FrameMain::~FrameMain () {
 	wxGetApp().frame = nullptr;
 
 	context->videoController->SetVideo("");
 	context->audioController->CloseAudio();
 
-	// SubsGrid needs to be deleted last due to being the selection
+	DestroyChildren();
-	// controller, but everything else needs to be deleted before the context
-	// is cleaned up
-	delete_children(this, SubsGrid);
 
 	delete context->ass;
 	delete context->audioController;
@@ -367,8 +340,7 @@ void FrameMain::InitContents() {
 	wxPanel *Panel = new wxPanel(this,-1,wxDefaultPosition,wxDefaultSize,wxTAB_TRAVERSAL | wxCLIP_CHILDREN);
 
 	StartupLog("Create subtitles grid");
-	context->subsGrid = SubsGrid = new BaseGrid(Panel, context.get(), wxDefaultSize, wxWANTS_CHARS | wxSUNKEN_BORDER);
+	context->subsGrid = new BaseGrid(Panel, context.get());
-	context->selectionController = context->subsGrid;
 	context->search = new SearchReplaceEngine(context.get());
 	context->initialLineState = new InitialLineState(context.get());
 
@@ -391,7 +363,7 @@ void FrameMain::InitContents() {
 	MainSizer = new wxBoxSizer(wxVERTICAL);
 	MainSizer->Add(new wxStaticLine(Panel),0,wxEXPAND | wxALL,0);
 	MainSizer->Add(TopSizer,0,wxEXPAND | wxALL,0);
-	MainSizer->Add(SubsGrid,1,wxEXPAND | wxALL,0);
+	MainSizer->Add(context->subsGrid,1,wxEXPAND | wxALL,0);
 	Panel->SetSizer(MainSizer);
 
 	StartupLog("Perform layout");

src/frame_main.h

@@ -37,11 +37,7 @@
 #include <memory>
 #include <vector>
 
-#include <wx/combobox.h>
 #include <wx/frame.h>
-#include <wx/log.h>
-#include <wx/menu.h>
-#include <wx/panel.h>
 #include <wx/sizer.h>
 #include <wx/timer.h>
 
@@ -49,7 +45,6 @@ class AegisubApp;
 class AegisubFileDropTarget;
 class AudioBox;
 class AudioProvider;
-class BaseGrid;
 class VideoBox;
 
 namespace agi { struct Context; class OptionValue; }
@@ -98,7 +93,6 @@ class FrameMain: public wxFrame {
 
 	void EnableToolBar(agi::OptionValue const& opt);
 
-	BaseGrid *SubsGrid; ///< The subtitle editing area
 	AudioBox *audioBox;      ///< The audio area
 	VideoBox *videoBox;      ///< The video area
 

src/include/aegisub/context.h

@@ -6,7 +6,7 @@ class AudioKaraoke;
 class DialogManager;
 class SearchReplaceEngine;
 class InitialLineState;
-template<class T> class SelectionController;
+class SelectionController;
 class SubsController;
 class SubsTextEditCtrl;
 class BaseGrid;
@@ -26,7 +26,7 @@ struct Context {
 
 	// Controllers
 	AudioController *audioController;
-	SelectionController<AssDialogue *> *selectionController;
+	SelectionController *selectionController;
 	SubsController *subsController;
 	TextSelectionController *textSelectionController;
 	VideoContext *videoController;

src/search_replace_engine.cpp

@@ -301,7 +301,7 @@ bool SearchReplaceEngine::ReplaceAll() {
 
 	auto matches = GetMatcher(settings);
 
-	SubtitleSelection const& sel = context->selectionController->GetSelectedSet();
+	auto const& sel = context->selectionController->GetSelectedSet();
 	bool selection_only = settings.limit_to == SearchReplaceSettings::Limit::SELECTED;
 
 	for (auto& diag : context->ass->Events) {

src/selection_controller.cpp

@@ -0,0 +1,83 @@
+// 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 "config.h"
+
+#include "selection_controller.h"
+
+#include "ass_dialogue.h"
+#include "ass_file.h"
+#include "include/aegisub/context.h"
+#include "subs_controller.h"
+#include "utils.h"
+
+SelectionController::SelectionController(agi::Context *c)
+: context(c)
+, open_connection(c->subsController->AddFileOpenListener(&SelectionController::OnSubtitlesOpen, this))
+, save_connection(c->subsController->AddFileSaveListener(&SelectionController::OnSubtitlesSave, this))
+{
+}
+
+void SelectionController::OnSubtitlesOpen() {
+	selection.clear();
+	active_line = nullptr;
+	if (!context->ass->Events.empty()) {
+		int row = mid<int>(0, context->ass->GetUIStateAsInt("Active Line"), context->ass->Events.size());
+		active_line = &*std::next(context->ass->Events.begin(), row);
+		selection.insert(active_line);
+	}
+	AnnounceSelectedSetChanged();
+	AnnounceActiveLineChanged(active_line);
+}
+
+void SelectionController::OnSubtitlesSave() {
+	if (active_line)
+		context->ass->SaveUIState("Active Line", std::to_string(std::distance(
+			context->ass->Events.begin(), context->ass->Events.iterator_to(*active_line))));
+}
+
+void SelectionController::SetSelectedSet(Selection new_selection) {
+	selection = std::move(new_selection);
+	AnnounceSelectedSetChanged();
+}
+
+void SelectionController::SetActiveLine(AssDialogue *new_line) {
+	if (new_line != active_line) {
+		active_line = new_line;
+		AnnounceActiveLineChanged(new_line);
+	}
+}
+
+void SelectionController::SetSelectionAndActive(Selection new_selection, AssDialogue *new_line) {
+	SetSelectedSet(std::move(new_selection));
+	SetActiveLine(new_line);
+}
+
+void SelectionController::PrevLine() {
+	if (!active_line) return;
+	auto it = context->ass->Events.iterator_to(*active_line);
+	if (it != context->ass->Events.begin()) {
+		--it;
+		SetSelectionAndActive({&*it}, &*it);
+	}
+}
+
+void SelectionController::NextLine() {
+	if (!active_line) return;
+	auto it = context->ass->Events.iterator_to(*active_line);
+	if (++it != context->ass->Events.end())
+		SetSelectionAndActive({&*it}, &*it);
+}

src/selection_controller.h

@@ -27,49 +27,32 @@
 //
 // Aegisub Project http://www.aegisub.org/
 
-/// @file selection_controller.h
+#include <libaegisub/signal.h>
-/// @ingroup controllers
-/// @brief Interface declaration for the SubtitleSelectionController
-
-#pragma once
 
 #include <set>
 
-#include <libaegisub/signal.h>
+class AssDialogue;
+typedef std::set<AssDialogue *> Selection;
+
+namespace agi { struct Context; }
 
-/// @class SelectionController
-/// @brief Abstract interface for selection controllers
-///
-/// Two concepts are managed by implementations of this interface: The concept of the
-/// active line, and the concept of the set of selected lines. There is one or zero
-/// active lines, the active line is the base for subtitle manipulation in the GUI.
-/// The set of selected lines may contain any number of subtitle lines, and those
-/// lines are the primary target of subtitle manipulation. In other words, the active
-/// line controls what values the user is presented to modify, and the selected set
-/// controls what lines are actually modified when the user performs modifications.
-/// In most cases, the active line will be a member of the selected set. It will be
-/// the responsibility of manipulators to affect the appropriate lines.
-///
-/// There is only intended to be one instance of a class implementing this interface
-/// per editing session, but there may be many different implementations of it.
-/// The primary implementation would be the subtitle grid in the main GUI, allowing
-/// the user to actively manipulate the active and selected line sets, but other
-/// potential implementations are in a test driver and in a non-interactive scenario.
-///
-/// Objects implementing the SelectionListener interface can subscribe to
-/// changes in the active line and the selected set.
-template <typename ItemDataType>
 class SelectionController {
-public:
+	agi::signal::Signal<AssDialogue *> AnnounceActiveLineChanged;
-	typedef std::set<ItemDataType> Selection;
-
-protected:
-	agi::signal::Signal<ItemDataType> AnnounceActiveLineChanged;
 	agi::signal::Signal<> AnnounceSelectedSetChanged;
 
+	agi::Context *context;
+
+	Selection selection; ///< Currently selected lines
+	AssDialogue *active_line = nullptr; ///< The currently active line or 0 if none
+
+	agi::signal::Connection open_connection;
+	agi::signal::Connection save_connection;
+
+	void OnSubtitlesOpen();
+	void OnSubtitlesSave();
+
 public:
-	/// Virtual destructor for safety
+	SelectionController(agi::Context *context);
-	virtual ~SelectionController() { }
 
 	/// @brief Change the active line
 	/// @param new_line Subtitle line to become the new active line
@@ -81,11 +64,11 @@ public:
 	/// the active line was actually changed.
 	///
 	/// This method must not affect the selected set.
-	virtual void SetActiveLine(ItemDataType new_line) = 0;
+	void SetActiveLine(AssDialogue *new_line);
 
 	/// @brief Obtain the active line
 	/// @return The active line or nullptr if there is none
-	virtual ItemDataType GetActiveLine() const = 0;
+	AssDialogue *GetActiveLine() const { return active_line;  }
 
 	/// @brief Change the selected set
 	/// @param new_selection The set of subtitle lines to become the new selected set
@@ -97,15 +80,15 @@ public:
 	/// If no change happens to the selected set, whether because it was refused or
 	/// because the new set was identical to the old set, no change notification may
 	/// be sent.
-	virtual void SetSelectedSet(Selection new_selection) = 0;
+	void SetSelectedSet(Selection new_selection);
 
 	/// @brief Obtain the selected set
 	/// @param[out] selection Filled with the selected set on return
-	virtual void GetSelectedSet(Selection &selection) const = 0;
+	void GetSelectedSet(Selection &out) const { out = selection; }
 
 	/// @brief Obtain the selected set
 	/// @return The selected set
-	virtual Selection const& GetSelectedSet() const = 0;
+	Selection const& GetSelectedSet() const { return selection; }
 
 	/// @brief Set both the selected set and active line
 	/// @param new_line Subtitle line to become the new active line
@@ -114,26 +97,22 @@ public:
 	/// This sets both the active line and selected set before announcing the
 	/// change to either of them, and is guaranteed to announce the active line
 	/// change before the selection change.
-	virtual void SetSelectionAndActive(Selection new_selection, ItemDataType new_line) = 0;
+	void SetSelectionAndActive(Selection new_selection, AssDialogue *new_line);
 
 	/// @brief Change the active line to the next in sequence
 	///
 	/// If there is no logical next line in sequence, no change happens. This should
 	/// also reset the selected set to consist of exactly the active line, if the
 	/// active line was changed.
-	virtual void NextLine() = 0;
+	void NextLine();
 
 	/// @brief Change the active line to the previous in sequence
 	///
 	/// If there is no logical previous line in sequence, no change happens. This
 	/// should also reset the selected set to consist of exactly the active line, if
 	/// the active line was changed.
-	virtual void PrevLine() = 0;
+	void PrevLine();
 
 	DEFINE_SIGNAL_ADDERS(AnnounceSelectedSetChanged, AddSelectionListener)
 	DEFINE_SIGNAL_ADDERS(AnnounceActiveLineChanged, AddActiveLineListener)
 };
-
-class AssDialogue;
-typedef SelectionController<AssDialogue *> SubtitleSelectionController;
-typedef SubtitleSelectionController::Selection SubtitleSelection;

src/subs_controller.cpp

@@ -23,7 +23,6 @@
 #include "ass_file.h"
 #include "ass_info.h"
 #include "ass_style.h"
-#include "base_grid.h"
 #include "charset_detect.h"
 #include "compat.h"
 #include "command/command.h"
@@ -92,7 +91,7 @@ struct SubsController::UndoInfo {
 		sort(begin(selection), end(selection));
 
 		AssDialogue *active_line = nullptr;
-		SubtitleSelection new_sel;
+		Selection new_sel;
 
 		for (auto const& info : script_info)
 			c->ass->Info.push_back(*new AssInfo(info.first, info.second));
@@ -108,11 +107,8 @@ struct SubsController::UndoInfo {
 				new_sel.insert(copy);
 		}
 
-		c->subsGrid->BeginBatch();
-		c->selectionController->SetSelectedSet(std::set<AssDialogue *>{});
 		c->ass->Commit("", AssFile::COMMIT_NEW);
 		c->selectionController->SetSelectionAndActive(std::move(new_sel), active_line);
-		c->subsGrid->EndBatch();
 	}
 
 	void UpdateActiveLine(const agi::Context *c) {
@@ -153,7 +149,7 @@ SubsController::SubsController(agi::Context *context)
 	});
 }
 
-void SubsController::SetSelectionController(SelectionController<AssDialogue *> *selection_controller) {
+void SubsController::SetSelectionController(SelectionController *selection_controller) {
 	active_line_connection = context->selectionController->AddActiveLineListener(&SubsController::OnActiveLineChanged, this);
 	selection_connection = context->selectionController->AddSelectionListener(&SubsController::OnSelectionChanged, this);
 }
@@ -277,6 +273,7 @@ void SubsController::Close() {
 	blank.swap(*context->ass);
 	context->ass->LoadDefault();
 	context->ass->Commit("", AssFile::COMMIT_NEW);
+	FileOpen(filename);
 }
 
 int SubsController::TryToClose(bool allow_cancel) const {

src/subs_controller.h

@@ -25,7 +25,7 @@
 class AssDialogue;
 class AssFile;
 struct AssFileCommit;
-template<typename T> class SelectionController;
+class SelectionController;
 
 namespace agi { struct Context; }
 
@@ -74,7 +74,7 @@ public:
 	///
 	/// Required due to that the selection controller is the subtitles grid, and
 	/// so is created long after the subtitles controller
-	void SetSelectionController(SelectionController<AssDialogue *> *selection_controller);
+	void SetSelectionController(SelectionController *selection_controller);
 
 	/// The file's path and filename if any, or platform-appropriate "untitled"
 	agi::fs::path Filename() const;

src/subs_edit_box.cpp

@@ -48,6 +48,7 @@
 #include "options.h"
 #include "placeholder_ctrl.h"
 #include "scintilla_text_selection_controller.h"
+#include "selection_controller.h"
 #include "subs_edit_ctrl.h"
 #include "timeedit_ctrl.h"
 #include "tooltip_manager.h"
@@ -383,7 +384,6 @@ void SubsEditBox::OnActiveLineChanged(AssDialogue *new_line) {
 }
 
 void SubsEditBox::OnSelectedSetChanged() {
-	sel = c->selectionController->GetSelectedSet();
 	initial_times.clear();
 }
 
@@ -421,6 +421,7 @@ void SubsEditBox::OnChange(wxStyledTextEvent &event) {
 
 template<class setter>
 void SubsEditBox::SetSelectedRows(setter set, wxString const& desc, int type, bool amend) {
+	auto const& sel = c->selectionController->GetSelectedSet();
 	for_each(sel.begin(), sel.end(), set);
 
 	file_changed_slot.Block();
@@ -449,6 +450,7 @@ void SubsEditBox::CommitText(wxString const& desc) {
 }
 
 void SubsEditBox::CommitTimes(TimeField field) {
+	auto const& sel = c->selectionController->GetSelectedSet();
 	for (AssDialogue *d : sel) {
 		if (!initial_times.count(d))
 			initial_times[d] = std::make_pair(d->Start, d->End);

src/subs_edit_box.h

@@ -45,8 +45,6 @@
 
 #include <libaegisub/signal.h>
 
-#include "selection_controller.h"
-
 namespace agi { namespace vfr { class Framerate; } }
 namespace agi { struct Context; }
 class AssDialogue;
@@ -80,8 +78,6 @@ class SubsEditBox final : public wxPanel {
 
 	/// Currently active dialogue line
 	AssDialogue *line = nullptr;
-	/// Last seen grid selection
-	SubtitleSelection sel;
 
 	/// Are the buttons currently split into two lines?
 	bool button_bar_split = true;

src/visual_tool.cpp

@@ -28,6 +28,7 @@
 #include "ass_time.h"
 #include "include/aegisub/context.h"
 #include "options.h"
+#include "selection_controller.h"
 #include "utils.h"
 #include "video_context.h"
 #include "video_display.h"
@@ -297,7 +298,7 @@ void VisualTool<FeatureType>::SetSelection(FeatureType *feat, bool clear) {
 		sel_features.clear();
 
 	if (sel_features.insert(feat).second && feat->line) {
-		SubtitleSelection sel;
+		Selection sel;
 		if (!clear)
 			sel = c->selectionController->GetSelectedSet();
 		if (sel.insert(feat->line).second)
@@ -311,7 +312,7 @@ void VisualTool<FeatureType>::RemoveSelection(FeatureType *feat) {
 	for (auto sel : sel_features)
 		if (sel->line == feat->line) return;
 
-	SubtitleSelection sel = c->selectionController->GetSelectedSet();
+	auto sel = c->selectionController->GetSelectedSet();
 
 	// Don't deselect the only selected line
 	if (sel.size() <= 1) return;

src/visual_tool.h

@@ -21,7 +21,6 @@
 #pragma once
 
 #include "gl_wrap.h"
-#include "selection_controller.h"
 #include "vector2d.h"
 
 #include <libaegisub/owning_intrusive_list.h>

src/visual_tool_cross.cpp

@@ -24,6 +24,7 @@
 
 #include "gl_text.h"
 #include "include/aegisub/context.h"
+#include "selection_controller.h"
 #include "video_display.h"
 
 #include <libaegisub/color.h>

src/visual_tool_drag.cpp

@@ -27,6 +27,7 @@
 #include "include/aegisub/context.h"
 #include "libresrc/libresrc.h"
 #include "options.h"
+#include "selection_controller.h"
 #include "utils.h"
 #include "video_context.h"
 #include "video_display.h"