[nostalgia/core/studio] Add acceptsClipboardPayload to TileSheetEditor

src/nostalgia/modules/core/src/studio/tilesheeteditor/tilesheeteditor-imgui.cpp

@@ -105,6 +105,10 @@ void TileSheetEditorImGui::paste() {
 	m_model.paste();
 }
 
+bool TileSheetEditorImGui::acceptsClipboardPayload() const noexcept {
+	return m_model.acceptsClipboardPayload();
+}
+
 void TileSheetEditorImGui::keyStateChanged(turbine::Key key, bool down) {
 	if (!down) {
 		return;

src/nostalgia/modules/core/src/studio/tilesheeteditor/tilesheeteditor-imgui.hpp

@@ -79,6 +79,9 @@ class TileSheetEditorImGui: public studio::Editor {
 
 		void paste() override;
 
+		[[nodiscard]]
+		bool acceptsClipboardPayload() const noexcept override;
+
 		void keyStateChanged(turbine::Key key, bool down) override;
 
 		void draw(studio::StudioContext&) noexcept override;

src/nostalgia/modules/core/src/studio/tilesheeteditor/tilesheeteditormodel.cpp

@@ -107,6 +107,11 @@ void TileSheetEditorModel::paste() {
 	pushCommand(ox::make<CutPasteCommand>(CommandId::Paste, m_img, m_activeSubsSheetIdx, pt1, pt2, *cb));
 }
 
+bool TileSheetEditorModel::acceptsClipboardPayload() const noexcept {
+	auto const cb = getClipboardObject<TileSheetClipboard>(m_tctx);
+	return cb.ok();
+}
+
 ox::StringView TileSheetEditorModel::palPath() const noexcept {
 	auto [path, err] = m_img.defaultPalette.getPath();
 	if (err) {
@@ -216,13 +221,15 @@ void TileSheetEditorModel::select(ox::Point const&pt) noexcept {
 }
 
 void TileSheetEditorModel::completeSelection() noexcept {
-	auto &s = activeSubSheet();
+	if (m_selTracker.selectionOngoing()) {
 		m_selTracker.finishSelection();
 		m_selection.emplace(m_selTracker.selection());
 		auto&pt = m_selection->b;
+		auto&s = activeSubSheet();
 		pt.x = ox::min(s.columns * TileWidth - 1, pt.x);
 		pt.y = ox::min(s.rows * TileHeight - 1, pt.y);
 	}
+}
 
 void TileSheetEditorModel::clearSelection() noexcept {
 	m_updated = true;

src/nostalgia/modules/core/src/studio/tilesheeteditor/tilesheeteditormodel.hpp

@@ -48,6 +48,9 @@ class TileSheetEditorModel: public ox::SignalHandler {
 
 		void paste();
 
+		[[nodiscard]]
+		bool acceptsClipboardPayload() const noexcept;
+
 		[[nodiscard]]
 		constexpr TileSheet const&img() const noexcept;