SpriteOverEvent 之靈異現象

重現方式

直接上 SSCCE：

public class SpriteTestEP extends DrawComponent implements EntryPoint {
	private RectangleSprite red = new RectangleSprite(200, 201, 100, 50);
	private RectangleSprite none = new RectangleSprite(200, 201, 300, 50);

	public SpriteTestEP() {
		red.setFill(RGB.RED);
		none.setFill(Color.NONE);

		addSprite(red);
		addSprite(none);

		addSpriteOverHandler(new SpriteOverHandler() {
			@Override
			public void onSpriteOver(SpriteOverEvent event) {
				log("Over : " + who(event.getSprite()));
			}
		});
		addSpriteOutHandler(new SpriteOutHandler() {
			@Override
			public void onSpriteLeave(SpriteOutEvent event) {
				log("Out : " + who(event.getSprite()));
			}
		});
	}

	private String who(Sprite sprite) {
		return (sprite == red ? "red" : "none");
	}

	public static native void log(Object object) /*-{
		console.log(
			@java.lang.String::valueOf(Ljava/lang/Object;)(object)
		);
	}-*/;

	@Override
	public void onModuleLoad() {
		//無關緊要，純粹 follow GXT 習慣  XD
		Viewport vp = new Viewport();
		vp.add(this);
		RootPanel.get().add(vp);
	}
}

操作步驟：

1. 游標進入紅色區塊
2. 慢慢水平移動滑鼠，直到離開紅色區塊