/*******************************************************************************
* Copyright (c) 2006 Sybase, Inc. 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:
* Sybase, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.actions.range;
import org.eclipse.gef.commands.Command;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jst.pagedesigner.dom.DOMPositionHelper;
import org.eclipse.jst.pagedesigner.dom.DOMRange;
import org.eclipse.jst.pagedesigner.viewer.DesignRange;
import org.eclipse.jst.pagedesigner.viewer.IHTMLGraphicalViewer;
import org.eclipse.ui.texteditor.IUpdate;
/**
* @author mengbo
*/
public abstract class DesignerToolBarAction extends Action implements IUpdate,
ISelectionChangedListener {
private IHTMLGraphicalViewer _viewer;
/**
* @param text
* @param style
*/
public DesignerToolBarAction(String text, int style) {
super(text, style);
}
/**
* @param text
* @param image
*/
public DesignerToolBarAction(String text, ImageDescriptor image) {
super(text, image);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(org.eclipse.jface.viewers.SelectionChangedEvent)
*/
public void selectionChanged(SelectionChangedEvent event) {
update();
}
/**
*
*/
public void update() {
if (canRun(this._viewer)) {
setEnabled(true);
updateStatus();
} else {
setEnabled(false);
}
}
/**
* Update the status
*/
protected void updateStatus() {
DesignRange range = _viewer.getRangeSelection();
DOMRange domRange = null;
if (range != null) {
domRange = new DOMRange(DOMPositionHelper.toDOMPosition(range
.getStartPosition()), DOMPositionHelper.toDOMPosition(range
.getEndPosition()));
if (isApplied(domRange)) {
this.setChecked(true);
} else {
this.setChecked(false);
}
}
}
/**
* @param range
* @return ??
*/
protected abstract boolean isApplied(DOMRange range);
/**
* @param viewer
* @return true if this action can run
*/
protected boolean canRun(IHTMLGraphicalViewer viewer) {
if (viewer != null && viewer.isInRangeMode()
&& viewer.getModel().getDocument().hasChildNodes()) {
DesignRange range = viewer.getRangeSelection();
if (range != null && range.isValid()) {
return true;
}
}
return false;
}
/**
* @param viewer
*/
public void setViewer(IHTMLGraphicalViewer viewer) {
if (viewer == _viewer) {
return;
}
if (_viewer != null) {
_viewer.removeSelectionChangedListener(this);
}
_viewer = viewer;
if (_viewer != null) {
_viewer.addSelectionChangedListener(this);
}
update();
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.action.IAction#run()
*/
public void run() {
// Assert.isTrue(_viewer != null && _viewer.isInRangeMode());
DesignRange range = _viewer.getRangeSelection();
if (range == null || !range.isValid()) {
return;
}
Command command = getCommand();
if (command != null) {
command.execute();
}
}
/**
* @return the command for this action or null
*/
protected abstract Command getCommand();
/**
* @return Returns the _viewer.
*/
public IHTMLGraphicalViewer getViewer() {
return _viewer;
}
}