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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Eclipse Public License, Version 1.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.eclipse.org/org/documents/epl-v10.php
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.ide.eclipse.adt.internal.editors.layout.gre;
     18 
     19 import com.android.ide.common.api.INode;
     20 import com.android.ide.eclipse.adt.internal.editors.layout.gle2.CanvasViewInfo;
     21 import com.android.ide.eclipse.adt.internal.editors.layout.gle2.LayoutCanvas;
     22 import com.android.ide.eclipse.adt.internal.editors.layout.gle2.SwtUtils;
     23 import com.android.ide.eclipse.adt.internal.editors.layout.uimodel.UiViewElementNode;
     24 
     25 import org.eclipse.swt.graphics.Rectangle;
     26 
     27 import java.util.Map;
     28 import java.util.WeakHashMap;
     29 
     30 /**
     31  * An object that can create {@link INode} proxies.
     32  * This also keeps references to objects already created and tries to reuse them.
     33  */
     34 public class NodeFactory {
     35 
     36     private final Map<UiViewElementNode, NodeProxy> mNodeMap =
     37         new WeakHashMap<UiViewElementNode, NodeProxy>();
     38     private LayoutCanvas mCanvas;
     39 
     40     public NodeFactory(LayoutCanvas canvas) {
     41         mCanvas = canvas;
     42     }
     43 
     44     /**
     45      * Returns an {@link INode} proxy based on the view key of the given
     46      * {@link CanvasViewInfo}. The bounds of the node are set to the canvas view bounds.
     47      */
     48     public NodeProxy create(CanvasViewInfo canvasViewInfo) {
     49         return create(canvasViewInfo.getUiViewNode(), canvasViewInfo.getAbsRect());
     50     }
     51 
     52     /**
     53      * Returns an {@link INode} proxy based on a given {@link UiViewElementNode} that
     54      * is not yet part of the canvas, typically those created by layout rules
     55      * when generating new XML.
     56      */
     57     public NodeProxy create(UiViewElementNode uiNode) {
     58         return create(uiNode, null /*bounds*/);
     59     }
     60 
     61     public void clear() {
     62         mNodeMap.clear();
     63     }
     64 
     65     public LayoutCanvas getCanvas() {
     66         return mCanvas;
     67     }
     68 
     69     //----
     70 
     71     private NodeProxy create(UiViewElementNode uiNode, Rectangle bounds) {
     72         NodeProxy proxy = mNodeMap.get(uiNode);
     73 
     74         if (proxy == null) {
     75             // Create a new proxy if the key doesn't exist
     76             proxy = new NodeProxy(uiNode, bounds, this);
     77             mNodeMap.put(uiNode, proxy);
     78 
     79         } else if (bounds != null && !SwtUtils.equals(proxy.getBounds(), bounds)) {
     80             // Update the bounds if necessary
     81             proxy.setBounds(bounds);
     82         }
     83 
     84         return proxy;
     85     }
     86 }
     87