Add evolution cancelling

src/ui/evolution-scene-handler.ts

@@ -4,23 +4,35 @@ import UiHandler from "./uiHandler";
 
 export default class EvolutionSceneHandler extends UiHandler {
     public evolutionContainer: Phaser.GameObjects.Container;
+    public canCancel: boolean;
+    public cancelled: boolean;
+
+    private cleanupFunc: Function;
 
     constructor(scene: BattleScene) {
       super(scene, Mode.EVOLUTION_SCENE);
     }
   
     setup() {
+      this.canCancel = false;
+      this.cancelled = false;
+
       this.evolutionContainer = this.scene.add.container(0, -this.scene.game.canvas.height / 6);
       this.scene.fieldUI.add(this.evolutionContainer);
     }
 
     show(_args: any[]): void {
       super.show(_args);
-
+      
       this.scene.fieldUI.bringToTop(this.evolutionContainer);
     }
   
     processInput(button: Button): boolean {
+      if (this.canCancel && !this.cancelled && button === Button.CANCEL) {
+        this.cancelled = true;
+        return true;
+      }
+
       return this.scene.ui.getMessageHandler().processInput(button);
     }
   
@@ -29,6 +41,8 @@ export default class EvolutionSceneHandler extends UiHandler {
     }
 
     clear() {
+      this.canCancel = false;
+      this.cancelled = false;
       this.evolutionContainer.removeAll(true);
     }
   }