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      1 /*******************************************************************************
      2  * Copyright (c) 2011 Google, Inc.
      3  * All rights reserved. This program and the accompanying materials
      4  * are made available under the terms of the Eclipse Public License v1.0
      5  * which accompanies this distribution, and is available at
      6  * http://www.eclipse.org/legal/epl-v10.html
      7  *
      8  * Contributors:
      9  *    Google, Inc. - initial API and implementation
     10  *******************************************************************************/
     11 package org.eclipse.wb.internal.core.model.property.editor;
     12 
     13 import org.eclipse.wb.core.controls.CCombo3;
     14 import org.eclipse.wb.internal.core.model.property.Property;
     15 import org.eclipse.wb.internal.core.model.property.table.PropertyTable;
     16 
     17 import org.eclipse.swt.SWT;
     18 import org.eclipse.swt.events.FocusAdapter;
     19 import org.eclipse.swt.events.FocusEvent;
     20 import org.eclipse.swt.events.MouseAdapter;
     21 import org.eclipse.swt.events.MouseEvent;
     22 import org.eclipse.swt.events.SelectionAdapter;
     23 import org.eclipse.swt.events.SelectionEvent;
     24 import org.eclipse.swt.graphics.Point;
     25 import org.eclipse.swt.graphics.Rectangle;
     26 import org.eclipse.swt.widgets.Event;
     27 import org.eclipse.swt.widgets.Listener;
     28 
     29 /**
     30  * The {@link PropertyEditor} for selecting single value using {@link CCombo3}.
     31  *
     32  * @author scheglov_ke
     33  * @coverage core.model.property.editor
     34  */
     35 public abstract class AbstractComboPropertyEditor extends TextDisplayPropertyEditor {
     36   ////////////////////////////////////////////////////////////////////////////
     37   //
     38   // Editing
     39   //
     40   ////////////////////////////////////////////////////////////////////////////
     41   private CCombo3 m_combo;
     42   private boolean m_doDropDown;
     43 
     44   @Override
     45   public boolean activate(final PropertyTable propertyTable, final Property property, Point location)
     46       throws Exception {
     47     // create combo
     48     {
     49       m_combo = new CCombo3(propertyTable, SWT.NONE);
     50       m_doDropDown = true;
     51       // add items
     52       addItems(property, m_combo);
     53       // select item
     54       selectItem(property, m_combo);
     55     }
     56     // add listeners
     57     m_combo.addFocusListener(new FocusAdapter() {
     58       @Override
     59       public void focusLost(FocusEvent e) {
     60         propertyTable.deactivateEditor(true);
     61       }
     62     });
     63     m_combo.addSelectionListener(new SelectionAdapter() {
     64       @Override
     65       public void widgetSelected(SelectionEvent e) {
     66         int index = m_combo.getSelectionIndex();
     67         toProperty(propertyTable, property, index);
     68       }
     69     });
     70     m_combo.addListener(SWT.KeyDown, new Listener() {
     71       public void handleEvent(Event event) {
     72         switch (event.keyCode) {
     73           case SWT.ESC :
     74             propertyTable.deactivateEditor(false);
     75             break;
     76           case SWT.DEL :
     77             try {
     78               property.setValue(Property.UNKNOWN_VALUE);
     79               event.doit = false;
     80               selectItem(property, m_combo);
     81             } catch (Throwable e) {
     82               propertyTable.handleException(e);
     83               propertyTable.deactivateEditor(false);
     84             }
     85             m_combo.doDropDown(false);
     86             break;
     87         }
     88       }
     89     });
     90     m_combo.addMouseListener(new MouseAdapter() {
     91       @Override
     92       public void mouseDoubleClick(MouseEvent e) {
     93         int index = (m_combo.getSelectionIndex() + 1) % m_combo.getItemCount();
     94         toProperty(propertyTable, property, index);
     95       }
     96     });
     97     // keep editor active
     98     return true;
     99   }
    100 
    101   @Override
    102   public final void setBounds(Rectangle bounds) {
    103     m_combo.setBounds(bounds);
    104     // editor created without bounds, so activate it after first setBounds()
    105     if (m_doDropDown) {
    106       m_doDropDown = false;
    107       m_combo.setFocus();
    108       m_combo.doDropDown(true);
    109       m_combo.startDrag();
    110     }
    111   }
    112 
    113   @Override
    114   public final void deactivate(PropertyTable propertyTable, Property property, boolean save) {
    115     if (m_combo != null) {
    116       m_combo.dispose();
    117       m_combo = null;
    118     }
    119   }
    120 
    121   ////////////////////////////////////////////////////////////////////////////
    122   //
    123   // Abstract methods
    124   //
    125   ////////////////////////////////////////////////////////////////////////////
    126   /**
    127    * Adds items to given {@link CCombo3}.
    128    */
    129   protected abstract void addItems(Property property, CCombo3 combo) throws Exception;
    130 
    131   /**
    132    * Selects current item in given {@link CCombo3}.
    133    */
    134   protected abstract void selectItem(Property property, CCombo3 combo) throws Exception;
    135 
    136   /**
    137    * Transfers data from widget to {@link Property}.
    138    */
    139   protected abstract void toPropertyEx(Property property, CCombo3 combo, int index)
    140       throws Exception;
    141 
    142   /**
    143    * Transfers data from widget to {@link Property}.
    144    */
    145   private void toProperty(PropertyTable propertyTable, Property property, int index) {
    146     try {
    147       toPropertyEx(property, m_combo, index);
    148     } catch (Throwable e) {
    149       propertyTable.handleException(e);
    150     }
    151     propertyTable.deactivateEditor(false);
    152   }
    153 }
    154