net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/actions/FoldingActionGroup.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation 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  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.actions;
  12
  13 import org.eclipse.jface.action.IMenuManager;
  14 import org.eclipse.jface.text.ITextViewer;
  15 import org.eclipse.jface.text.source.projection.IProjectionListener;
  16 import org.eclipse.jface.text.source.projection.ProjectionViewer;
  17 import org.eclipse.ui.actions.ActionGroup;
  18 import org.eclipse.ui.editors.text.IFoldingCommandIds;
  19 import org.eclipse.ui.texteditor.ITextEditor;
  20 import org.eclipse.ui.texteditor.TextOperationAction;
  21
  22 /**
  23  * Groups the JDT folding actions.
  24  *
  25  * @since 3.0
  26  */
  27 public class FoldingActionGroup extends ActionGroup {
  28         private ProjectionViewer fViewer;
  29
  30         private TextOperationAction fToggle;
  31
  32         private TextOperationAction fExpand;
  33
  34         private TextOperationAction fCollapse;
  35
  36         private TextOperationAction fExpandAll;
  37
  38         private IProjectionListener fProjectionListener;
  39
  40         /**
  41          * Creates a new projection action group for <code>editor</code>. If the
  42          * supplied viewer is not an instance of <code>ProjectionViewer</code>,
  43          * the action group is disabled.
  44          *
  45          * @param editor
  46          *            the text editor to operate on
  47          * @param viewer
  48          *            the viewer of the editor
  49          */
  50         public FoldingActionGroup(ITextEditor editor, ITextViewer viewer) {
  51                 if (viewer instanceof ProjectionViewer) {
  52                         fViewer = (ProjectionViewer) viewer;
  53
  54                         fProjectionListener = new IProjectionListener() {
  55
  56                                 public void projectionEnabled() {
  57                                         update();
  58                                 }
  59
  60                                 public void projectionDisabled() {
  61                                         update();
  62                                 }
  63                         };
  64
  65                         fViewer.addProjectionListener(fProjectionListener);
  66
  67                         fToggle = new TextOperationAction(ActionMessages
  68                                         .getResourceBundle(),
  69                                         "Projection.Toggle.", editor, ProjectionViewer.TOGGLE, true); //$NON-NLS-1$
  70                         fToggle.setChecked(true);
  71                         fToggle.setActionDefinitionId(IFoldingCommandIds.FOLDING_TOGGLE);
  72                         editor.setAction("FoldingToggle", fToggle); //$NON-NLS-1$
  73
  74                         fExpandAll = new TextOperationAction(
  75                                         ActionMessages.getResourceBundle(),
  76                                         "Projection.ExpandAll.", editor, ProjectionViewer.EXPAND_ALL, true); //$NON-NLS-1$
  77                         fExpandAll
  78                                         .setActionDefinitionId(IFoldingCommandIds.FOLDING_EXPAND_ALL);
  79                         editor.setAction("FoldingExpandAll", fExpandAll); //$NON-NLS-1$
  80
  81                         fExpand = new TextOperationAction(ActionMessages
  82                                         .getResourceBundle(),
  83                                         "Projection.Expand.", editor, ProjectionViewer.EXPAND, true); //$NON-NLS-1$
  84                         fExpand.setActionDefinitionId(IFoldingCommandIds.FOLDING_EXPAND);
  85                         editor.setAction("FoldingExpand", fExpand); //$NON-NLS-1$
  86
  87                         fCollapse = new TextOperationAction(
  88                                         ActionMessages.getResourceBundle(),
  89                                         "Projection.Collapse.", editor, ProjectionViewer.COLLAPSE, true); //$NON-NLS-1$
  90                         fCollapse
  91                                         .setActionDefinitionId(IFoldingCommandIds.FOLDING_COLLAPSE);
  92                         editor.setAction("FoldingCollapse", fCollapse); //$NON-NLS-1$
  93                 }
  94         }
  95
  96         /**
  97          * Returns <code>true</code> if the group is enabled.
  98          *
  99          * <pre>
 100          *  Invariant: isEnabled() &lt;=&gt; fViewer and all actions are != null.
 101          * </pre>
 102          *
 103          * @return <code>true</code> if the group is enabled
 104          */
 105         private boolean isEnabled() {
 106                 return fViewer != null;
 107         }
 108
 109         /*
 110          * @see org.eclipse.ui.actions.ActionGroup#dispose()
 111          */
 112         public void dispose() {
 113                 if (isEnabled()) {
 114                         fViewer.removeProjectionListener(fProjectionListener);
 115                         fViewer = null;
 116                 }
 117                 super.dispose();
 118         }
 119
 120         /**
 121          * Updates the actions.
 122          */
 123         protected void update() {
 124                 if (isEnabled()) {
 125                         fToggle.update();
 126                         fToggle.setChecked(fViewer.getProjectionAnnotationModel() != null);
 127                         fExpand.update();
 128                         fExpandAll.update();
 129                         fCollapse.update();
 130                 }
 131         }
 132
 133         /**
 134          * Fills the menu with all folding actions.
 135          *
 136          * @param manager
 137          *            the menu manager for the folding submenu
 138          */
 139         public void fillMenu(IMenuManager manager) {
 140                 if (isEnabled()) {
 141                         update();
 142                         manager.add(fToggle);
 143                         manager.add(fExpandAll);
 144                         manager.add(fExpand);
 145                         manager.add(fCollapse);
 146                 }
 147         }
 148
 149         /*
 150          * @see org.eclipse.ui.actions.ActionGroup#updateActionBars()
 151          */
 152         public void updateActionBars() {
 153                 update();
 154         }
 155 }