javafx.scene.input.ScrollEvent#isControlDown ( )源码实例Demo

/** Zoom in/out triggered by mouse wheel
 *  @param event Scroll event
 */
protected void wheelZoom(final ScrollEvent event)
{
    // Invoked by mouse scroll wheel.
    // Only allow zoom (with control), not pan.
    if (! event.isControlDown())
        return;

    if (event.getDeltaY() > 0)
        zoomInOut(event.getX(), event.getY(), 1.0/ZOOM_FACTOR);
    else if (event.getDeltaY() < 0)
        zoomInOut(event.getX(), event.getY(), ZOOM_FACTOR);
    else
        return;
    event.consume();
}
 

private void processScrollEvent(ScrollEvent ev) {
    if (page == null) {
        return;
    }
    double dx = - ev.getDeltaX() * webView.getFontScale() * webView.getScaleX();
    double dy = - ev.getDeltaY() * webView.getFontScale() * webView.getScaleY();
    WCMouseWheelEvent wheelEvent =
            new WCMouseWheelEvent((int)ev.getX(), (int)ev.getY(),
                (int)ev.getScreenX(), (int)ev.getScreenY(),
                System.currentTimeMillis(),
                ev.isShiftDown(), ev.isControlDown(), ev.isAltDown(),
                ev.isMetaDown(), (float)dx, (float)dy);
    page.dispatchMouseWheelEvent(wheelEvent);
    ev.consume();
}
 

public void handle(ScrollEvent event) {
	if(!this.control.isIgnoreEvents()) {
		if( event.isControlDown() ) {
			this.onZoom(new UIZoomEvent(this.control, (event.getDeltaY() > 0 ? 1 : -1)));
			
			event.consume();
		}
	}
}
 

/**
 * Returns <code>true</code> if the given {@link ScrollEvent} should trigger
 * panning. Otherwise returns <code>false</code>.
 *
 * @param event
 *            The {@link ScrollEvent} in question.
 * @return <code>true</code> to indicate that the given {@link ScrollEvent}
 *         should trigger panning, otherwise <code>false</code>.
 */
protected boolean isPan(ScrollEvent event) {
	// Do not scroll when a modifier key (<Alt>, <Control>, <Meta>) is
	// pressed.
	return !(event.isAltDown() || event.isControlDown()
			|| event.isMetaDown());
}
 

/**
 * Returns <code>true</code> if the given {@link ScrollEvent} should trigger
 * zooming. Otherwise returns <code>false</code>. Per default, either
 * <code>&lt;Control&gt;</code> or <code>&lt;Alt&gt;</code> has to be
 * pressed so that <code>true</code> is returned.
 *
 * @param event
 *            The {@link ScrollEvent} in question.
 * @return <code>true</code> if the given {@link ScrollEvent} should trigger
 *         zooming, otherwise <code>false</code>.
 */
protected boolean isZoom(ScrollEvent event) {
	return event.isControlDown() || event.isAltDown();
}