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/*******************************************************************************
* Copyright (c) 2004, 2008 Jingwen Ou 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:
* Jingwen Ou - initial API and implementation
* Tasktop Technologies - improvements
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui.commands;
import java.util.Map;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.HandlerEvent;
import org.eclipse.jface.action.IAction;
import org.eclipse.mylyn.internal.tasks.ui.editors.EditorUtil;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.commands.IElementUpdater;
import org.eclipse.ui.forms.editor.FormEditor;
import org.eclipse.ui.forms.editor.IFormPage;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.ui.menus.UIElement;
/**
* @author Jingwen Ou
* @author Steffen Pingel
*/
public class ViewSourceHandler extends AbstractHandler implements IElementUpdater {
private static boolean checked;
private static ViewSourceHandler instance;
public ViewSourceHandler() {
instance = this;
}
public boolean isChecked() {
return checked;
}
public static void setChecked(boolean checked) {
ViewSourceHandler.checked = checked;
if (instance != null) {
instance.fireHandlerChanged(new HandlerEvent(instance, true, false));
}
}
private Control getFocusControl() {
return PlatformUI.getWorkbench().getDisplay().getFocusControl();
}
@Override
public boolean isEnabled() {
Control focusControl = getFocusControl();
if (focusControl instanceof StyledText && focusControl.getData(VIEW_SOURCE_ACTION) instanceof IAction) {
return true;
}
return false;
}
public static final String VIEW_SOURCE_ACTION = "viewSourceAction"; //$NON-NLS-1$
public Object execute(ExecutionEvent event) throws ExecutionException {
IWorkbenchSite site = HandlerUtil.getActiveSite(event);
if (site instanceof IEditorSite) {
IWorkbenchPart part = ((IEditorSite) site).getPart();
if (part instanceof FormEditor) {
IFormPage page = ((FormEditor) part).getActivePageInstance();
Control focusedControl = EditorUtil.getFocusControl(page);
if (focusedControl != null) {
Object data = focusedControl.getData(VIEW_SOURCE_ACTION);
if (data instanceof IAction) {
IAction action = (IAction) data;
action.setChecked(!action.isChecked());
action.run();
setChecked(action.isChecked());
}
}
}
}
return null;
}
@SuppressWarnings("unchecked")
public void updateElement(UIElement element, Map parameters) {
element.setChecked(checked);
}
}
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