EventsExecutor.java 文件源码

public void setMousePressed(JavaScriptObject aValue) {
    if (mousePressed != aValue) {
        if (mouseDownReg != null) {
            mouseDownReg.removeHandler();
            mouseDownReg = null;
        }
        mousePressed = aValue;
        if (mousePressed != null) {
            MouseDownHandler handler = new MouseDownHandler() {
                @Override
                public void onMouseDown(MouseDownEvent event) {
                    if (mousePressed != null) {
                        event.stopPropagation();
                        // Event.setCapture(event.getRelativeElement());
                        mouseState = MOUSE.PRESSED;
                        executeEvent(mousePressed, EventsPublisher.publish(event));
                    }
                }
            };
            if (component instanceof Widget) {
                mouseDownReg = ((Widget) component).addDomHandler(handler, MouseDownEvent.getType());
            } else if (component instanceof HasMouseDownHandlers) {
                mouseDownReg = ((HasMouseDownHandlers) component).addMouseDownHandler(handler);
            }
        }
    }
}