Add edit-undo history to tileset metatile editing

include/ui/metatilelayersitem.h

@@ -13,14 +13,18 @@ public:
         this->metatile = metatile;
         this->primaryTileset = primaryTileset;
         this->secondaryTileset = secondaryTileset;
+        this->clearLastModifiedCoords();
     }
     void draw();
     void setTilesets(Tileset*, Tileset*);
     void setMetatile(Metatile*);
+    void clearLastModifiedCoords();
 private:
     Metatile* metatile;
     Tileset *primaryTileset;
     Tileset *secondaryTileset;
+    QPoint prevChangedTile;
+    void getBoundedCoords(QPointF, int*, int*);
 signals:
     void tileChanged(int, int);
     void selectedTilesChanged(QPoint, int, int);

include/ui/tileseteditor.h

@@ -3,6 +3,7 @@
 
 #include <QMainWindow>
 #include "project.h"
+#include "history.h"
 #include "paletteeditor.h"
 #include "tileseteditormetatileselector.h"
 #include "tileseteditortileselector.h"
@@ -12,6 +13,22 @@ namespace Ui {
 class TilesetEditor;
 }
 
+class MetatileHistoryItem {
+public:
+    MetatileHistoryItem(uint16_t metatileId, Metatile *prevMetatile, Metatile *newMetatile) {
+        this->metatileId = metatileId;
+        this->prevMetatile = prevMetatile;
+        this->newMetatile = newMetatile;
+    }
+    ~MetatileHistoryItem() {
+        delete this->prevMetatile;
+        delete this->newMetatile;
+    }
+    uint16_t metatileId;
+    Metatile *prevMetatile;
+    Metatile *newMetatile;
+};
+
 class TilesetEditor : public QMainWindow
 {
     Q_OBJECT
@@ -41,10 +58,6 @@ private slots:
 
     void on_checkBox_yFlip_stateChanged(int arg1);
 
-    void on_comboBox_metatileBehaviors_currentIndexChanged(const QString &arg1);
-
-    void on_comboBox_layerType_currentIndexChanged(int index);
-
     void on_actionSave_Tileset_triggered();
 
     void on_actionImport_Primary_Tiles_triggered();
@@ -55,6 +68,14 @@ private slots:
 
     void on_actionChange_Palettes_triggered();
 
+    void on_actionUndo_triggered();
+
+    void on_actionRedo_triggered();
+
+    void on_comboBox_metatileBehaviors_activated(const QString &arg1);
+
+    void on_comboBox_layerType_activated(int arg1);
+
 private:
     void closeEvent(QCloseEvent*);
     void initMetatileSelector();
@@ -65,6 +86,7 @@ private:
     void importTilesetTiles(Tileset*, bool);
     void refresh();
     Ui::TilesetEditor *ui;
+    History<MetatileHistoryItem*> metatileHistory;
     TilesetEditorMetatileSelector *metatileSelector = nullptr;
     TilesetEditorTileSelector *tileSelector = nullptr;
     MetatileLayersItem *metatileLayersItem = nullptr;