/*******************************************************************************
* 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.gwtext.model.layout;
import com.google.gdt.eclipse.designer.gwtext.model.layout.assistant.BorderLayoutAssistant;
import com.google.gdt.eclipse.designer.gwtext.model.widgets.ContainerInfo;
import com.google.gdt.eclipse.designer.model.widgets.WidgetAttachAfterConstructor;
import com.google.gdt.eclipse.designer.model.widgets.WidgetInfo;
import org.eclipse.wb.core.eval.EvaluationContext;
import org.eclipse.wb.core.model.JavaInfo;
import org.eclipse.wb.core.model.association.Association;
import org.eclipse.wb.core.model.broadcast.EvaluationEventListener;
import org.eclipse.wb.core.model.broadcast.JavaInfoSetAssociationBefore;
import org.eclipse.wb.internal.core.model.JavaInfoUtils;
import org.eclipse.wb.internal.core.model.creation.CreationSupport;
import org.eclipse.wb.internal.core.model.description.ComponentDescription;
import org.eclipse.wb.internal.core.utils.ast.AstEditor;
import org.eclipse.wb.internal.core.utils.reflect.ReflectionUtils;
import org.eclipse.wb.internal.core.utils.state.GlobalState;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.Statement;
/**
* Model for <code>com.gwtext.client.widgets.layout.BorderLayout</code>.
*
* @author scheglov_ke
* @coverage GWTExt.model.layout
*/
public final class BorderLayoutInfo extends LayoutInfo {
////////////////////////////////////////////////////////////////////////////
//
// Constructor
//
////////////////////////////////////////////////////////////////////////////
public BorderLayoutInfo(AstEditor editor,
ComponentDescription description,
CreationSupport creationSupport) throws Exception {
super(editor, description, creationSupport);
ensureCenterWidgetListeners();
}
////////////////////////////////////////////////////////////////////////////
//
// Initialize
//
////////////////////////////////////////////////////////////////////////////
@Override
protected void initializeLayoutAssistant() {
new BorderLayoutAssistant(this);
}
////////////////////////////////////////////////////////////////////////////
//
// Layout notifications
//
////////////////////////////////////////////////////////////////////////////
@Override
public void onSet() throws Exception {
super.onSet();
for (WidgetInfo widget : getContainer().getChildrenWidgets()) {
getBorderData(widget).materialize();
}
}
////////////////////////////////////////////////////////////////////////////
//
// Components/constraints
//
////////////////////////////////////////////////////////////////////////////
@Override
protected Object getDefaultVirtualDataObject(WidgetInfo widget) throws Exception {
return new Object();
}
/**
* @return {@link BorderLayoutDataInfo} association with given {@link WidgetInfo}.
*/
public static BorderLayoutDataInfo getBorderData(WidgetInfo widget) {
return (BorderLayoutDataInfo) getLayoutData(widget);
}
/**
* @return the {@link WidgetInfo} that has given position, may be <code>null</code>.
*/
public Object getWidget(String position) {
for (WidgetInfo widget : getContainer().getChildrenWidgets()) {
String widgetPosition = getBorderData(widget).getPosition();
if (position.equals(widgetPosition)) {
return widget;
}
}
return null;
}
////////////////////////////////////////////////////////////////////////////
//
// Refresh
//
////////////////////////////////////////////////////////////////////////////
@Override
protected void refresh_afterCreate0() throws Exception {
ensureCenterWidget();
super.refresh_afterCreate0();
}
////////////////////////////////////////////////////////////////////////////
//
// Center widget
//
////////////////////////////////////////////////////////////////////////////
private void ensureCenterWidgetListeners() {
addBroadcastListener(new WidgetAttachAfterConstructor() {
public void invoke() throws Exception {
ensureCenterWidget();
}
});
// when association of container is going to be executed during "parse"
addBroadcastListener(new JavaInfoSetAssociationBefore() {
public void invoke(JavaInfo javaInfo, Association association) throws Exception {
ContainerInfo container = getContainer();
if (isActive() && GlobalState.isParsing() && javaInfo == container) {
ensureCenterWidget();
}
}
});
// when association of container is going to be executed during "refresh"
addBroadcastListener(new EvaluationEventListener() {
@Override
public void evaluateBefore(EvaluationContext context, ASTNode node) throws Exception {
if (isActive() && node instanceof Statement) {
Association association = getContainer().getAssociation();
if (association != null && association.getStatement() == node) {
ensureCenterWidget();
}
}
}
});
}
private void ensureCenterWidget() throws Exception {
if (getWidget("center") == null) {
ClassLoader classLoader = JavaInfoUtils.getClassLoader(this);
// prepare Panel
Object panel;
{
Class<?> panelClass = classLoader.loadClass("com.gwtext.client.widgets.Panel");
panel =
ReflectionUtils.getConstructor(panelClass, String.class, String.class).newInstance(
"Center",
"No widget with CENTER position.");
}
// prepare RowLayoutData
Object data;
{
Class<?> dataClass =
classLoader.loadClass("com.gwtext.client.widgets.layout.BorderLayoutData");
Class<?> regionClass = classLoader.loadClass("com.gwtext.client.core.RegionPosition");
Object centerRegion = ReflectionUtils.getFieldObject(regionClass, "CENTER");
data = ReflectionUtils.getConstructor(dataClass, regionClass).newInstance(centerRegion);
}
// add Panel to CENTER
ReflectionUtils.invokeMethod(
getContainer().getObject(),
"add(com.gwtext.client.widgets.Component,com.gwtext.client.widgets.layout.LayoutData)",
panel,
data);
}
}
}