java.awt.Container#dispatchEvent ( )源码实例Demo

@Override
public void mouseWheelMoved(MouseWheelEvent event) {
	// on reporte l'évènement mouseWheelMoved de ce scrollPane vers son parent
	final Container parent = event.getComponent().getParent();
	parent.dispatchEvent(
			SwingUtilities.convertMouseEvent(event.getComponent(), event, parent));
}
 

@Override
public void mouseWheelMoved(final MouseWheelEvent e) {
	if (e.isControlDown() && e.getWheelRotation() != 0) {
		double oldZoomFactor = rendererView.getModel().getZoomFactor();
		if (e.getWheelRotation() < 0) {
			rendererView.getModel().zoomIn();
		} else {
			rendererView.getModel().zoomOut();
		}
		rendererView.getModel().fireProcessZoomChanged();

		// calculate how the scrollbar needs to be adjusted for centered zoom
		double relativeZoomFactor = rendererView.getModel().getZoomFactor() / oldZoomFactor;
		double differenceHorizontal = e.getPoint().getX() * (relativeZoomFactor - 1);
		double differenceVertical = e.getPoint().getY() * (relativeZoomFactor - 1);

		int newX = Math.max(0, (int) (scrollPane.getHorizontalScrollBar().getValue() + differenceHorizontal));
		int newY = Math.max(0, (int) (scrollPane.getVerticalScrollBar().getValue() + differenceVertical));

		scrollPane.getHorizontalScrollBar().setValue(newX);
		scrollPane.getVerticalScrollBar().setValue(newY);

		// prevent flickering when another adjustment of the scrollbars is needed
		RepaintManager.currentManager(scrollPane).markCompletelyClean(scrollPane);

		/**
		 * Setting the value as above does not always work since the scrollbars are not yet
		 * updated to the size changes caused by the zooming. Set flag an values to try
		 * again after the resizing happened.
		 */
		zoomed = true;
		desiredVerticalScrollValue = newY;
		desiredHorizontalScrollValue = newX;
		return;
	}

	Container p = rendererView.getParent();
	if (p != null) {
		p.dispatchEvent(SwingUtilities.convertMouseEvent(rendererView, e, p));
	}
}
 

private void sendToParent(@Nonnull final AWTEvent evt) {
  final Container parent = this.getParent();
  if (parent != null) {
    parent.dispatchEvent(evt);
  }
}
 

private void sendEventToParent(@Nonnull final MouseEvent e) {
  final Container parent = this.getParent();
  if (parent != null) {
    parent.dispatchEvent(e);
  }
}