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

/**
 * @param event Zooms in and out when the mouse is scrolled.
 */
public void onScrollHandler(ScrollEvent event) {
  double delta = 1.2;
  double scale = (plot.getScaleX());

  if (event.getDeltaY() < 0) {
    scale /= delta;
  } else {
    scale *= delta;
  }

  scale = clamp(scale, MIN_SCALE, MAX_SCALE);

  plot.setScaleX(scale);
  plot.setScaleY(scale);

  event.consume();
}
 

/** 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();
}
 

/**
 * @param event
 *            Zooms in and out when the mouse is scrolled.
 */
public void onScrollHandler(ScrollEvent event) {
    double delta = 1.2;
    double scale = (plot.getScaleX());

    if (event.getDeltaY() < 0) {
        scale /= delta;
    } else {
        scale *= delta;
    }

    scale = clamp(scale, MIN_SCALE, MAX_SCALE);

    plot.setScaleX(scale);
    plot.setScaleY(scale);

    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();
}
 

@Override
public void handle(ScrollEvent event) {
	double scale = canvas.getScale(); // currently we only use Y, same value is used for X
	final double oldScale = scale;

	if(event.getDeltaY() < 0) {
		scale /= getZoomSpeed();
	} else if (event.getDeltaY() > 0) {
		scale *= getZoomSpeed();
	}

	scale = clamp(scale, minScaleProperty.get(), maxScaleProperty.get());
	final double f = (scale / oldScale) - 1;

	// maxX = right overhang, maxY = lower overhang
	final double maxX = canvas.getBoundsInParent().getMaxX() - canvas.localToParent(canvas.getPrefWidth(), canvas.getPrefHeight()).getX();
	final double maxY = canvas.getBoundsInParent().getMaxY() - canvas.localToParent(canvas.getPrefWidth(), canvas.getPrefHeight()).getY();

	// minX = left overhang, minY = upper overhang
	final double minX = canvas.localToParent(0, 0).getX() - canvas.getBoundsInParent().getMinX();
	final double minY = canvas.localToParent(0, 0).getY() - canvas.getBoundsInParent().getMinY();

	// adding the overhangs together, as we only consider the width of canvas itself
	final double subX = maxX + minX;
	final double subY = maxY + minY;

	// subtracting the overall overhang from the width and only the left and upper overhang from the upper left point
	final double dx = (event.getSceneX() - ((canvas.getBoundsInParent().getWidth() - subX) / 2 + (canvas.getBoundsInParent().getMinX() + minX)));
	final double dy = (event.getSceneY() - ((canvas.getBoundsInParent().getHeight() - subY) / 2 + (canvas.getBoundsInParent().getMinY() + minY)));

	canvas.setScale(scale);

	// note: pivot value must be untransformed, i. e. without scaling
	canvas.setPivot(f * dx, f * dy);

	event.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();
		}
	}
}
 

public void handle(ScrollEvent event) {
	if(!this.control.isIgnoreEvents()) {
		Integer button = JFXMouseButton.getMouseButton(MouseButton.MIDDLE);
		Integer value = (int) Math.round(event.getDeltaX() != 0 ? event.getDeltaX() : event.getDeltaY());
		this.onMouseWheel(new UIMouseWheelEvent(this.control, new UIPosition((float)event.getX(), (float)event.getY()), button, value));
		
		event.consume();
	}
}
 

public void handle(ScrollEvent event) {
	this.control.onScroll((int) -Math.round(event.getDeltaX() != 0 ? event.getDeltaX() : event.getDeltaY()));
	
	event.consume();
}
 

/**
 * Push scroll events received by cell nodes directly to
 * the 'owner' Node. (Generally likely to be a VirtualFlow
 * but not required.)
 *
 * Normal bubbling of scroll events gets interrupted during
 * a scroll gesture when the Cell's Node receiving the event
 * has moved out of the viewport and is thus removed from
 * the Navigator's children list. This breaks expected trackpad
 * scrolling behaviour, at least on macOS.
 * 
 * So here we take over event-bubbling duties for ScrollEvent
 * and push them ourselves directly to the given owner.
 */
private void pushScrollEvent(ScrollEvent se) {
    owner.fireEvent(se);
    se.consume();
}