DrawingInteractionPanel.java 文件源码

@Override
public void onTouchMove(TouchMoveEvent event) {
    if (dragging) {
        if (event.getTouches().length() == 1) {
            Element e = event.getRelativeElement();
            int deltaX = event.getTouches().get(0).getRelativeX(e) - startX;
            int deltaY = event.getTouches().get(0).getRelativeY(e) - startY;
            rectangle.setX(rectangle.getX() + deltaX);
            rectangle.setY(rectangle.getY() + deltaY);
            text.setX(text.getX() + deltaX);
            text.setY(text.getY() + deltaY);
        }
    }
}