archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/editor/ShowSelectedElementOnlyAction.java

   1 /*
   2  * Copyright (c) 2003-2004 Christopher Lenz and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     Christopher Lenz - initial API and implementation
  10  *
  11  * $Id: ShowSelectedElementOnlyAction.java,v 1.1 2004-09-02 18:11:50 jsurfer Exp $
  12  */
  13
  14 package net.sourceforge.phpeclipse.css.ui.internal.editor;
  15
  16 import net.sourceforge.phpeclipse.css.ui.CssUI;
  17 import net.sourceforge.phpeclipse.css.ui.internal.CssUIMessages;
  18 import net.sourceforge.phpeclipse.css.ui.internal.CssUIPreferences;
  19
  20 import org.eclipse.jface.preference.IPreferenceStore;
  21 import org.eclipse.jface.text.IRegion;
  22 import org.eclipse.jface.util.IPropertyChangeListener;
  23 import org.eclipse.jface.util.PropertyChangeEvent;
  24 import org.eclipse.ui.texteditor.ITextEditor;
  25 import org.eclipse.ui.texteditor.TextEditorAction;
  26
  27 /**
  28  * A toolbar action which toggles the presentation model of the connected text
  29  * editor. The editor shows either the highlight range only or always the whole
  30  * document.
  31  *
  32  * <p>
  33  *  This class is an implementation for the retargetable action
  34  *  <code>TOGGLE_SHOW_SELECTED_ELEMENT_ONLY</code> provided by the platform.
  35  * </p>
  36  *
  37  * @see org.eclipse.ui.texteditor.ITextEditorActionDefinitionIds#TOGGLE_SHOW_SELECTED_ELEMENT_ONLY
  38  */
  39 public class ShowSelectedElementOnlyAction extends TextEditorAction
  40         implements IPropertyChangeListener {
  41
  42         // Instance Variables ------------------------------------------------------
  43
  44         private IPreferenceStore store;
  45
  46         // Constructors ------------------------------------------------------------
  47
  48         /**
  49          * Constructor.
  50          */
  51         public ShowSelectedElementOnlyAction() {
  52                 super(CssUIMessages.getResourceBundle(),
  53                         "CssEditor.showSelectedElementOnly.", null); //$NON-NLS-1$
  54                 store = CssUI.getDefault().getPreferenceStore();
  55                 update();
  56         }
  57
  58         // TextEditor Implementation -----------------------------------------------
  59
  60         /*
  61          * @see org.eclipse.jface.action.IAction#run()
  62          */
  63         public void run() {
  64                 ITextEditor editor = getTextEditor();
  65                 if (editor != null) {
  66                         IRegion highlightRange = editor.getHighlightRange();
  67                         editor.resetHighlightRange();
  68                         boolean show = !editor.showsHighlightRangeOnly();
  69                         setChecked(show);
  70                         editor.showHighlightRangeOnly(show);
  71                         if (highlightRange != null) {
  72                                 editor.setHighlightRange(highlightRange.getOffset(),
  73                                         highlightRange.getLength(), true);
  74                         }
  75                         store.removePropertyChangeListener(this);
  76                         store.setValue(
  77                                 CssUIPreferences.EDITOR_SHOW_SELECTED_ELEMENT_ONLY, show);
  78                         store.addPropertyChangeListener(this);
  79                 }
  80         }
  81
  82         /*
  83          * @see TextEditorAction#setEditor(ITextEditor)
  84          */
  85         public void setEditor(ITextEditor editor) {
  86                 super.setEditor(editor);
  87                 if (editor != null) {
  88                         if (store == null) {
  89                                 store = CssUI.getDefault().getPreferenceStore();
  90                                 store.addPropertyChangeListener(this);
  91                         }
  92                         synchronizeWithPreference(editor);
  93                 } else if (store != null) {
  94                         store.removePropertyChangeListener(this);
  95                         store = null;
  96                 }
  97                 update();
  98         }
  99
 100         /*
 101          * @see org.eclipse.ui.texteditor.IUpdate#update()
 102          */
 103         public void update() {
 104                 ITextEditor editor = getTextEditor();
 105                 if (editor != null) {
 106                         setChecked(getTextEditor().showsHighlightRangeOnly());
 107                         setEnabled(true);
 108                 } else {
 109                         setEnabled(false);
 110                 }
 111         }
 112
 113         // IPropertyChangeListener Implementation ----------------------------------
 114
 115         /*
 116          * @see IPropertyChangeListener#propertyChange(PropertyChangeEvent)
 117          */
 118         public void propertyChange(PropertyChangeEvent event) {
 119                 String p = event.getProperty();
 120                 if (CssUIPreferences.EDITOR_SHOW_SELECTED_ELEMENT_ONLY.equals(p)) {
 121                         synchronizeWithPreference(getTextEditor());
 122                 }
 123         }
 124
 125         // Private Methods ---------------------------------------------------------
 126
 127         /**
 128          * Synchronizes the appearance of the editor with what the preference store
 129          * contains.
 130          *
 131          * @param editor the editor to synchronize
 132          */
 133         private void synchronizeWithPreference(ITextEditor editor) {
 134                 if (editor != null) {
 135                         boolean show = this.store.getBoolean(
 136                                 CssUIPreferences.EDITOR_SHOW_SELECTED_ELEMENT_ONLY);
 137                         setChecked(show);
 138                         if (show != editor.showsHighlightRangeOnly()) {
 139                                 IRegion highlightRange = editor.getHighlightRange();
 140                                 editor.resetHighlightRange();
 141                                 editor.showHighlightRangeOnly(show);
 142                                 if (highlightRange != null) {
 143                                         editor.setHighlightRange(highlightRange.getOffset(),
 144                                                 highlightRange.getLength(), true);
 145                                 }
 146                         }
 147                 }
 148         }
 149
 150 }