EventHandlingUtils.java 文件源码

private static Point getPoint(EventHandlingTarget drawPanelCanvas, HumanInputEvent<?> event) {
    Element e = drawPanelCanvas.getElement();
    if (event instanceof MouseEvent<?>) {
        return new Point(((MouseEvent<?>) event).getRelativeX(e), ((MouseEvent<?>) event).getRelativeY(e));
    }
    else if (event instanceof TouchEndEvent) {
        return new Point(((TouchEvent<?>) event).getChangedTouches().get(0).getRelativeX(e), ((TouchEvent<?>) event).getChangedTouches().get(0).getRelativeY(e));
    }
    else if (event instanceof TouchEvent<?>) {
        return new Point(((TouchEvent<?>) event).getTouches().get(0).getRelativeX(e), ((TouchEvent<?>) event).getTouches().get(0).getRelativeY(e));
    }
    else {
        throw new RuntimeException("Unknown Event Type: " + event);
    }
}