/*******************************************************************************
* Copyright 2011 Google Inc. All Rights Reserved.
*
* 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
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
package com.google.gdt.eclipse.designer.uibinder.model.widgets.generic;
import com.google.gdt.eclipse.designer.model.widgets.IUIObjectSizeSupport;
import com.google.gdt.eclipse.designer.uibinder.model.widgets.WidgetInfo;
import org.eclipse.wb.core.model.ObjectInfo;
import org.eclipse.wb.core.model.broadcast.ObjectEventListener;
import org.eclipse.wb.internal.core.xml.model.XmlObjectInfo;
import org.eclipse.wb.internal.core.xml.model.utils.XmlObjectUtils;
/**
* Some panels, such as <code>SimplePanel</code> require "technical" size <code>"100%"</code> for
* child widget(s) to fill this panel client area. But when we move widget out, we should not keep
* this "technical" size, because <code>"100%"</code> for widget on <code>RootPanel</code> looks
* very bad. On same time size for widgets on <code>AbsolutePanel</code> is usually reasonable, so
* should be kept.
* <p>
* Supports for following parameters:
* <ul>
* <li><b>onChildOut.removeSize</b> specifies when size should be removed. Following values are
* possible:
* <ul>
* <li><b>always</b> - remove size always, no matter what is new target container.</li>
* <li><b>never</b> - keep size, no matter what is new target container.</li>
* </ul>
* </li>
* </ul>
*
* @author scheglov_ke
* @coverage GWT.UiBinder.model
*/
public final class UpdateSizeOnChildOutSupport {
////////////////////////////////////////////////////////////////////////////
//
// Constructor
//
////////////////////////////////////////////////////////////////////////////
public UpdateSizeOnChildOutSupport(XmlObjectInfo root) {
root.addBroadcastListener(new ObjectEventListener() {
@Override
public void childRemoveBefore(ObjectInfo parent, ObjectInfo child) throws Exception {
removeSize(child);
}
});
}
////////////////////////////////////////////////////////////////////////////
//
// Implementation
//
////////////////////////////////////////////////////////////////////////////
private void removeSize(ObjectInfo child) throws Exception {
if (!child.isDeleting()
&& child instanceof WidgetInfo
&& child.getParent() instanceof WidgetInfo) {
WidgetInfo widget = (WidgetInfo) child;
WidgetInfo parent = (WidgetInfo) child.getParent();
String removePolicy = XmlObjectUtils.getParameter(parent, "onChildOut.removeSize");
if ("always".equals(removePolicy)) {
String noSize = IUIObjectSizeSupport.NO_SIZE;
widget.getSizeSupport().setSize(noSize, noSize);
}
}
}
}