// Widget argument: Image cache will be cleared when the given widget is disposed
public FileIconCache(@NotNull Widget disposeWidget) {
this.disposeWidget = disposeWidget;
disposeWidget.addDisposeListener(
new DisposeListener() {
public void widgetDisposed(DisposeEvent e) {
for (Image image : fileIconMap.values()) image.dispose();
fileIconMap.clear();
}
});
}
/**
* Dispose of the resource manager when the widget is disposed
*
* @param widget
* @param resources
*/
public static void hookDisposal(Widget widget, final ResourceManager resources) {
if (widget == null || resources == null) return;
widget.addDisposeListener(
new DisposeListener() {
public void widgetDisposed(DisposeEvent e) {
resources.dispose();
}
});
}
/**
* This method should be called by *all* Widgets which use resources provided by this
* SWTResourceManager. When widgets are disposed, they are removed from the "users" Vector, and
* when no more registered Widgets are left, all resources are disposed.
*
* <p>If this method is not called for all Widgets then it should not be called at all, and the
* "dispose" method should be explicitly called after all resources are no longer being used.
*/
public static void registerResourceUser(Widget widget) {
if (users.contains(widget)) return;
users.add(widget);
widget.addDisposeListener(disposeListener);
}