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      1 /*
      2  * Copyright (C) 2007 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.uimodel;
     18 
     19 import com.android.ide.eclipse.adt.internal.editors.descriptors.TextValueDescriptor;
     20 
     21 import org.w3c.dom.Document;
     22 import org.w3c.dom.Node;
     23 import org.w3c.dom.Text;
     24 
     25 /**
     26  * Represents an XML element value in that can be modified using a simple text field
     27  * in the XML editor's user interface.
     28  */
     29 public class UiTextValueNode extends UiTextAttributeNode {
     30 
     31     public UiTextValueNode(TextValueDescriptor attributeDescriptor, UiElementNode uiParent) {
     32         super(attributeDescriptor, uiParent);
     33     }
     34 
     35     /**
     36      * Updates the current text field's value when the XML has changed.
     37      * <p/>
     38      * The caller doesn't really know if value of the element has changed,
     39      * so it will call this to refresh the value anyway. The value
     40      * is only set if it has changed.
     41      * <p/>
     42      * This also resets the "dirty" flag.
     43     */
     44     @Override
     45     public void updateValue(Node xml_attribute_node) {
     46         setCurrentValue(DEFAULT_VALUE);
     47 
     48         // The argument xml_attribute_node is not used here. It should always be
     49         // null since this is not an attribute. What we want is the "text value" of
     50         // the parent element, which is actually the first text node of the element.
     51 
     52         UiElementNode parent = getUiParent();
     53         if (parent != null) {
     54             Node xml_node = parent.getXmlNode();
     55             if (xml_node != null) {
     56                 for (Node xml_child = xml_node.getFirstChild();
     57                     xml_child != null;
     58                     xml_child = xml_child.getNextSibling()) {
     59                     if (xml_child.getNodeType() == Node.TEXT_NODE) {
     60                         setCurrentValue(xml_child.getNodeValue());
     61                         break;
     62                     }
     63                 }
     64             }
     65         }
     66 
     67         if (isValid() && !getTextWidgetValue().equals(getCurrentValue())) {
     68             try {
     69                 setInInternalTextModification(true);
     70                 setTextWidgetValue(getCurrentValue());
     71                 setDirty(false);
     72             } finally {
     73                 setInInternalTextModification(false);
     74             }
     75         }
     76     }
     77 
     78     /* (non-java doc)
     79      * Called by the user interface when the editor is saved or its state changed
     80      * and the modified "attributes" must be committed (i.e. written) to the XML model.
     81      */
     82     @Override
     83     public void commit() {
     84         UiElementNode parent = getUiParent();
     85         if (parent != null && isValid() && isDirty()) {
     86             // Get (or create) the underlying XML element node that contains the value.
     87             Node element = parent.prepareCommit();
     88             if (element != null) {
     89                 String value = getTextWidgetValue();
     90 
     91                 // Try to find an existing text child to update.
     92                 boolean updated = false;
     93 
     94                 for (Node xml_child = element.getFirstChild();
     95                         xml_child != null;
     96                         xml_child = xml_child.getNextSibling()) {
     97                     if (xml_child.getNodeType() == Node.TEXT_NODE) {
     98                         xml_child.setNodeValue(value);
     99                         updated = true;
    100                         break;
    101                     }
    102                 }
    103 
    104                 // If we didn't find a text child to update, we need to create one.
    105                 if (!updated) {
    106                     Document doc = element.getOwnerDocument();
    107                     if (doc != null) {
    108                         Text text = doc.createTextNode(value);
    109                         element.appendChild(text);
    110                     }
    111                 }
    112 
    113                 setCurrentValue(value);
    114             }
    115         }
    116         setDirty(false);
    117     }
    118 }
    119