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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.values.uimodel;
     18 
     19 import com.android.ide.eclipse.adt.internal.editors.descriptors.TextValueDescriptor;
     20 import com.android.ide.eclipse.adt.internal.editors.uimodel.UiAttributeNode;
     21 import com.android.ide.eclipse.adt.internal.editors.uimodel.UiElementNode;
     22 import com.android.ide.eclipse.adt.internal.editors.uimodel.UiTextValueNode;
     23 
     24 import org.eclipse.jface.dialogs.IMessageProvider;
     25 import org.eclipse.swt.events.DisposeEvent;
     26 import org.eclipse.swt.events.DisposeListener;
     27 import org.eclipse.swt.events.ModifyEvent;
     28 import org.eclipse.swt.events.ModifyListener;
     29 import org.eclipse.swt.widgets.Text;
     30 
     31 import java.util.regex.Pattern;
     32 
     33 /**
     34  * Displays and edits a color XML element value with a custom validator.
     35  * <p/>
     36  * See {@link UiAttributeNode} for more information.
     37  */
     38 public class UiColorValueNode extends UiTextValueNode {
     39 
     40     /** Accepted RGBA formats are one of #RGB, #ARGB, #RRGGBB or #AARRGGBB. */
     41     private static final Pattern RGBA_REGEXP = Pattern.compile(
     42             "#(?:[0-9a-fA-F]{3,4}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})"); //$NON-NLS-1$
     43 
     44     public UiColorValueNode(TextValueDescriptor attributeDescriptor, UiElementNode uiParent) {
     45         super(attributeDescriptor, uiParent);
     46     }
     47 
     48     /* (non-java doc)
     49      *
     50      * Add a modify listener that will check colors have the proper format,
     51      * that is one of #RGB, #ARGB, #RRGGBB or #AARRGGBB.
     52      */
     53     @Override
     54     protected void onAddValidators(final Text text) {
     55         ModifyListener listener = new ModifyListener() {
     56             @Override
     57             public void modifyText(ModifyEvent e) {
     58                 String color = text.getText();
     59                 if (RGBA_REGEXP.matcher(color).matches()) {
     60                     getManagedForm().getMessageManager().removeMessage(text, text);
     61                 } else {
     62                     getManagedForm().getMessageManager().addMessage(text,
     63                             "Accepted color formats are one of #RGB, #ARGB, #RRGGBB or #AARRGGBB.",
     64                             null /* data */, IMessageProvider.ERROR, text);
     65                 }
     66             }
     67         };
     68 
     69         text.addModifyListener(listener);
     70 
     71         // Make sure the validator removes its message(s) when the widget is disposed
     72         text.addDisposeListener(new DisposeListener() {
     73             @Override
     74             public void widgetDisposed(DisposeEvent e) {
     75                 getManagedForm().getMessageManager().removeMessage(text, text);
     76             }
     77         });
     78 
     79         // Finally call the validator once to make sure the initial value is processed
     80         listener.modifyText(null);
     81     }
     82 }
     83