/**
* Internal MDI frames have offsets where a popup menu should be shown (in JDK 1.2). This method
* sums up iteratively all x and y offsets of all parent compontents until the top parent
* component is reached.
*/
private void adjustOffsets(Component comp, Point offsetPoint) {
if (comp != null) {
Point compLocation = comp.getLocation();
offsetPoint.translate(compLocation.x, compLocation.y);
adjustOffsets(comp.getParent(), offsetPoint);
}
}
/**
* This method displays a popup menu, if there is one registered with the Figure (the Figure's
* attributes are queried for Figure.POPUP_MENU which is used to indicate an association of a
* popup menu with the Figure).
*
* @param figure Figure for which a popup menu should be displayed
* @param x x coordinate where the popup menu should be displayed
* @param y y coordinate where the popup menu should be displayed
* @param component Component which invoked the popup menu
*/
protected void showPopupMenu(Figure figure, int x, int y, Component comp) {
final Object attribute = figure.getAttribute(Figure.POPUP_MENU);
if ((attribute != null) && (attribute instanceof JPopupMenu)) {
JPopupMenu popup = (JPopupMenu) attribute;
if (popup instanceof PopupMenuFigureSelection) {
((PopupMenuFigureSelection) popup).setSelectedFigure(figure);
}
// calculate offsets for internal MDI frames
Point newLocation = new Point(x, y);
adjustOffsets(comp.getParent(), newLocation);
popup.setLocation(newLocation);
popup.setInvoker(comp);
popup.setVisible(true);
}
}