/*******************************************************************************
* 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.editors.actions;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jst.pagedesigner.commands.DesignerCommand;
import org.eclipse.jst.pagedesigner.commands.range.ApplyStyleCommand;
import org.eclipse.jst.pagedesigner.range.RangeUtil;
import org.eclipse.jst.pagedesigner.viewer.DesignRange;
import org.eclipse.jst.pagedesigner.viewer.HTMLGraphicalViewerListenenerAdapter;
import org.eclipse.jst.pagedesigner.viewer.IHTMLGraphicalViewer;
import org.eclipse.jst.pagedesigner.viewer.IHTMLGraphicalViewerListener;
import org.eclipse.ui.texteditor.IUpdate;
/**
* @author mengbo
*/
public abstract class ChangeStyleAction extends Action implements IUpdate {
private IHTMLGraphicalViewer _viewer;
private String _expectedTag;
private IHTMLGraphicalViewerListener _listener = new HTMLGraphicalViewerListenenerAdapter()
{
/*
* (non-Javadoc)
*
* @see org.eclipse.jst.pagedesigner.viewer.IHTMLGraphicalViewerListener#selectionChangeFinished()
*/
public void selectionChangeFinished() {
update();
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(org.eclipse.jface.viewers.SelectionChangedEvent)
*/
public void selectionChanged(SelectionChangedEvent event) {
update();
}
};
/**
* @param text
* @param name
* @param image
* @param style
*/
public ChangeStyleAction(String text, String name, ImageDescriptor image,
int style) {
super(text, style);
_expectedTag = name;
this.setImageDescriptor(image);
}
/**
* @param viewer
*/
public void setViewer(IHTMLGraphicalViewer viewer) {
if (viewer == _viewer) {
return;
}
if (_viewer != null) {
_viewer.removeHTMLViewerListener(_listener);
}
_viewer = viewer;
if (_viewer != null) {
_viewer.addHTMLViewerListener(_listener);
}
update();
}
/**
*
*/
public void update()
{
boolean update = checkForUpdateAndMaybeDisableState();
if (update)
{
updateState();
}
}
/**
* Update the state
*/
protected void updateState()
{
DesignRange range = _viewer.getRangeSelection();
updateStatus(RangeUtil.normalize(range));
}
/**
* Update the checked/enabled state
* @return true if we should update status
*/
protected final boolean checkForUpdateAndMaybeDisableState()
{
if (_viewer == null) {
this.setChecked(false);
this.setEnabled(false);
return false;
}
if (!_viewer.isInRangeMode()) {
// XXX: later we may support in range mode.
this.setChecked(false);
this.setEnabled(false);
return false;
}
DesignRange range = _viewer.getRangeSelection();
if (range == null || !range.isValid()) {
this.setChecked(false);
this.setEnabled(false);
return false;
}
return true;
}
/**
* @return the viewer's current design range
*/
protected final DesignRange getDesignRange()
{
return _viewer.getRangeSelection();
}
/**
* @param range
*/
private void updateStatus(DesignRange range) {
if (range.isEmpty()) {
this.setEnabled(false);
this.setChecked(false); // FIXME: not handling checked status yet.
} else {
this.setEnabled(true);
this.setChecked(false);
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.action.Action#run()
*/
public void run() {
if (_viewer == null || !_viewer.isInRangeMode()) {
return;
}
DesignRange range = _viewer.getRangeSelection();
if (range == null || !range.isValid()) {
return;
}
if (range.isEmpty())
return; // nothing to do to empty range.
// if currently checked, means unapply the style. If current not
// checked, means apply the style
boolean apply = !this.isChecked();
if (apply) {
applyStyle();
} else {
// not supported yet.
}
}
/**
*
*/
private void applyStyle() {
DesignerCommand command = new ApplyStyleCommand(_viewer,
getExpectedTag(), getExpectedCSSProperty(),
getExpectedCSSPropertyValue());
command.execute();
}
/**
* @return the expected property value
*/
protected abstract String getExpectedCSSPropertyValue();
/**
* @return the expected property
*/
protected abstract String getExpectedCSSProperty();
/**
* @return the expected tag
*/
protected String getExpectedTag() {
return _expectedTag;
}
}