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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.eclipse.org/org/documents/epl-v10.php
*
* 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.android.ide.eclipse.adt.internal.editors.layout.gre;
import com.android.ide.common.api.INode;
import com.android.ide.eclipse.adt.internal.editors.layout.gle2.CanvasViewInfo;
import com.android.ide.eclipse.adt.internal.editors.layout.gle2.LayoutCanvas;
import com.android.ide.eclipse.adt.internal.editors.layout.gle2.SwtUtils;
import com.android.ide.eclipse.adt.internal.editors.layout.uimodel.UiViewElementNode;
import org.eclipse.swt.graphics.Rectangle;
import java.util.Map;
import java.util.WeakHashMap;
/**
* An object that can create {@link INode} proxies.
* This also keeps references to objects already created and tries to reuse them.
*/
public class NodeFactory {
private final Map<UiViewElementNode, NodeProxy> mNodeMap =
new WeakHashMap<UiViewElementNode, NodeProxy>();
private LayoutCanvas mCanvas;
public NodeFactory(LayoutCanvas canvas) {
mCanvas = canvas;
}
/**
* Returns an {@link INode} proxy based on the view key of the given
* {@link CanvasViewInfo}. The bounds of the node are set to the canvas view bounds.
*/
public NodeProxy create(CanvasViewInfo canvasViewInfo) {
return create(canvasViewInfo.getUiViewNode(), canvasViewInfo.getAbsRect());
}
/**
* Returns an {@link INode} proxy based on a given {@link UiViewElementNode} that
* is not yet part of the canvas, typically those created by layout rules
* when generating new XML.
*/
public NodeProxy create(UiViewElementNode uiNode) {
return create(uiNode, null /*bounds*/);
}
public void clear() {
mNodeMap.clear();
}
public LayoutCanvas getCanvas() {
return mCanvas;
}
//----
private NodeProxy create(UiViewElementNode uiNode, Rectangle bounds) {
NodeProxy proxy = mNodeMap.get(uiNode);
if (proxy == null) {
// Create a new proxy if the key doesn't exist
proxy = new NodeProxy(uiNode, bounds, this);
mNodeMap.put(uiNode, proxy);
} else if (bounds != null && !SwtUtils.equals(proxy.getBounds(), bounds)) {
// Update the bounds if necessary
proxy.setBounds(bounds);
}
return proxy;
}
}
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