/*******************************************************************************
* Copyright (c) 2005, 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*
*******************************************************************************/
package org.eclipse.wst.xsd.ui.internal.search.actions;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.action.IMenuCreator;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.events.MenuAdapter;
import org.eclipse.swt.events.MenuEvent;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.ui.IEditorActionDelegate;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;
//TODO (trung) should be in common.ui this one ??
public abstract class BaseGroupActionDelegate implements IObjectActionDelegate, IEditorActionDelegate, IMenuCreator
{
protected ISelection fSelection;
private IAction fDelegateAction;
// whether to re-fill the menu (reset on selection change)
private boolean fFillMenu = true;
protected IWorkbenchPart workbenchPart;
public BaseGroupActionDelegate()
{
}
/*
* @see org.eclipse.ui.IObjectActionDelegate#setActivePart(org.eclipse.jface.action.IAction, org.eclipse.ui.IWorkbenchPart)
*/
public void setActivePart(IAction action, IWorkbenchPart targetPart) {
workbenchPart = targetPart;
}
/* (non-Javadoc)
* @see org.eclipse.jface.action.IMenuCreator#dispose()
*/
public void dispose() {
// nothing to do
}
/* (non-Javadoc)
* @see org.eclipse.jface.action.IMenuCreator#getMenu(org.eclipse.swt.widgets.Control)
*/
public Menu getMenu(Control parent) {
// never called
return null;
}
/* (non-Javadoc)
* @see org.eclipse.jface.action.IMenuCreator#getMenu(org.eclipse.swt.widgets.Menu)
*/
public Menu getMenu(Menu parent) {
//Create the new menu. The menu will get filled when it is about to be shown. see fillMenu(Menu).
Menu menu = new Menu(parent);
/**
* Add listener to repopulate the menu each time
* it is shown because MenuManager.update(boolean, boolean)
* doesn't dispose pulldown ActionContribution items for each popup menu.
*/
menu.addMenuListener(new MenuAdapter() {
public void menuShown(MenuEvent e) {
if (fFillMenu) {
Menu m = (Menu)e.widget;
MenuItem[] items = m.getItems();
for (int i=0; i < items.length; i++) {
items[i].dispose();
}
fillMenu(m);
fFillMenu = false;
}
}
});
return menu;
}
/*
* @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
*/
public void run(IAction action) {
// Never called because we become a menu.
}
/*
* @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction, org.eclipse.jface.viewers.ISelection)
*/
public void selectionChanged(IAction action, ISelection selection) {
fDelegateAction = action;
updateWith(selection);
}
public void setActiveEditor(IAction action, IEditorPart targetEditor) {
workbenchPart = targetEditor;
fDelegateAction = action;
if (targetEditor != null && targetEditor.getEditorSite() != null && targetEditor.getEditorSite().getSelectionProvider() != null) {
updateWith(targetEditor.getEditorSite().getSelectionProvider().getSelection());
}
}
public void updateWith(ISelection selection) {
fSelection = selection;
if (fDelegateAction != null) {
boolean enable = false;
if (selection != null) {
if (selection instanceof ITextSelection) {
//if (((ITextSelection) selection).getLength() > 0) {
enable = true;
//}
}
else if(selection instanceof IStructuredSelection ){
enable = !selection.isEmpty();
}
}
// enable action
fDelegateAction.setEnabled(enable);
// fill submenu
fFillMenu = true;
fDelegateAction.setMenuCreator(this);
}
}
protected abstract void fillMenu(Menu menu);
}