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.common.layout; 18 19 import static com.android.ide.eclipse.adt.internal.editors.layout.descriptors.LayoutDescriptors.REQUEST_FOCUS; 20 21 import com.android.ide.common.api.IMenuCallback; 22 import com.android.ide.common.api.INode; 23 import com.android.ide.common.api.INodeHandler; 24 import com.android.ide.common.api.IViewRule; 25 import com.android.ide.common.api.InsertType; 26 import com.android.ide.common.api.RuleAction; 27 28 import java.util.List; 29 30 /** 31 * An {@link IViewRule} for android.widget.EditText. 32 */ 33 public class EditTextRule extends BaseViewRule { 34 35 @Override 36 public void onCreate(INode node, INode parent, InsertType insertType) { 37 super.onCreate(node, parent, insertType); 38 39 if (parent != null) { 40 INode focus = findFocus(findRoot(parent)); 41 if (focus == null) { 42 // Add <requestFocus> 43 node.appendChild(REQUEST_FOCUS); 44 } 45 } 46 } 47 48 /** 49 * {@inheritDoc} 50 * <p> 51 * Adds a "Request Focus" menu item. 52 */ 53 @Override 54 public void addContextMenuActions(List<RuleAction> actions, final INode selectedNode) { 55 super.addContextMenuActions(actions, selectedNode); 56 57 final boolean hasFocus = hasFocus(selectedNode); 58 final String label = hasFocus ? "Clear Focus" : "Request Focus"; 59 60 IMenuCallback onChange = new IMenuCallback() { 61 public void action(RuleAction menuAction, List<? extends INode> selectedNodes, 62 String valueId, Boolean newValue) { 63 selectedNode.editXml(label, new INodeHandler() { 64 public void handle(INode node) { 65 INode focus = findFocus(findRoot(node)); 66 if (focus != null && focus.getParent() != null) { 67 focus.getParent().removeChild(focus); 68 } 69 if (!hasFocus) { 70 node.appendChild(REQUEST_FOCUS); 71 } 72 } 73 }); 74 } 75 }; 76 77 actions.add(RuleAction.createAction("_setfocus", label, onChange, //$NON-NLS-1$ 78 null, 5, false /*supportsMultipleNodes*/)); 79 actions.add(RuleAction.createSeparator(7)); 80 } 81 82 /** Returns true if the given node currently has focus */ 83 private static boolean hasFocus(INode node) { 84 INode focus = findFocus(node); 85 if (focus != null) { 86 return focus.getParent() == node; 87 } 88 89 return false; 90 } 91 92 /** Returns the root/top level node in the view hierarchy that contains the given node */ 93 private static INode findRoot(INode node) { 94 // First find the parent 95 INode root = node; 96 while (root != null) { 97 INode parent = root.getParent(); 98 if (parent == null) { 99 break; 100 } else { 101 root = parent; 102 } 103 } 104 105 return root; 106 } 107 108 /** Finds the focus node (not the node containing focus, but the actual request focus node 109 * under a given node */ 110 private static INode findFocus(INode node) { 111 if (node.getFqcn().equals(REQUEST_FOCUS)) { 112 return node; 113 } 114 115 for (INode child : node.getChildren()) { 116 INode focus = findFocus(child); 117 if (focus != null) { 118 return focus; 119 } 120 } 121 return null; 122 } 123 124 } 125