[nostalgia/core/studio] Add delete tile

src/nostalgia/core/studio/TileSheetEditor.qml

@@ -95,6 +95,14 @@ Rectangle {
 					sheetData.insertTileCmd(tile.tileNumber);
 				}
 			}
+
+			MenuItem {
+				text: "Delete Tile"
+				onTriggered: {
+					var tile = mouseArea.tileAt(contextMenu.x, contextMenu.y);
+					sheetData.deleteTileCmd(tile.tileNumber);
+				}
+			}
 		}
 
 		onPositionChanged: sheetData.updatePixel(pixelAt(mouseX, mouseY))

src/nostalgia/core/studio/tilesheeteditor.cpp

@@ -190,11 +190,13 @@ class InsertTileCommand: public QUndoCommand {
 	private:
 		SheetData *m_sheetData = nullptr;
 		int m_idx = 0;
+		bool m_delete = false;
 
 	public:
-		InsertTileCommand(SheetData *sheetData, int idx) {
+		InsertTileCommand(SheetData *sheetData, int idx, bool del = false) {
 			m_sheetData = sheetData;
 			m_idx = idx;
+			m_delete = del;
 		}
 
 		virtual ~InsertTileCommand() = default;
@@ -204,12 +206,20 @@ class InsertTileCommand: public QUndoCommand {
 		}
 
 		void redo() override {
+			if (m_delete) {
+				m_sheetData->deleteTile(m_idx);
+			} else {
 				m_sheetData->insertTile(m_idx);
 			}
+		}
 
 		void undo() override {
+			if (m_delete) {
+				m_sheetData->insertTile(m_idx);
+			} else {
 				m_sheetData->deleteTile(m_idx);
 			}
+		}
 
 };
 
@@ -235,6 +245,10 @@ void SheetData::insertTileCmd(int tileIdx) {
 	m_cmdStack.push(new InsertTileCommand(this, tileIdx));
 }
 
+void SheetData::deleteTileCmd(int tileIdx) {
+	m_cmdStack.push(new InsertTileCommand(this, tileIdx, true));
+}
+
 int SheetData::columns() const {
 	return m_columns;
 }
@@ -311,6 +325,7 @@ void SheetData::insertTile(int tileIdx) {
 void SheetData::deleteTile(int tileIdx) {
 	m_pixels.remove(tileIdx * PixelsPerTile, PixelsPerTile);
 	emit pixelsChanged();
+	emit changeOccurred();
 }
 
 void SheetData::setSelectedColor(int index) {

src/nostalgia/core/studio/tilesheeteditor.hpp

@@ -45,6 +45,8 @@ class SheetData: public QObject {
 
 		Q_INVOKABLE void insertTileCmd(int tileIdx);
 
+		Q_INVOKABLE void deleteTileCmd(int tileIdx);
+
 		[[nodiscard]] int columns() const;
 
 		[[nodiscard]] int rows() const;