case-study/jdt-after/ui/org/eclipse/jdt/internal/ui/text/template/contentassist/TemplateInformationControlCreator.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2008 IBM Corporation and others.
   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  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package org.eclipse.jdt.internal.ui.text.template.contentassist;
  12
  13 import org.eclipse.swt.SWT;
  14 import org.eclipse.swt.events.DisposeEvent;
  15 import org.eclipse.swt.events.DisposeListener;
  16 import org.eclipse.swt.widgets.Shell;
  17
  18 import org.eclipse.core.runtime.Assert;
  19
  20 import org.eclipse.jface.text.IInformationControl;
  21 import org.eclipse.jface.text.IInformationControlCreator;
  22 import org.eclipse.jface.text.IInformationControlCreatorExtension;
  23
  24 import org.eclipse.jdt.internal.ui.JavaPlugin;
  25 import org.eclipse.jdt.internal.ui.text.java.hover.SourceViewerInformationControl;
  26
  27
  28 public final class TemplateInformationControlCreator implements IInformationControlCreator, IInformationControlCreatorExtension {
  29
  30         private SourceViewerInformationControl fControl;
  31
  32         /**
  33          * The orientation to be used by this hover.
  34          * Allowed values are: SWT#RIGHT_TO_LEFT or SWT#LEFT_TO_RIGHT
  35          * @since 3.2
  36          */
  37         private int fOrientation;
  38
  39         /**
  40          * @param orientation the orientation, allowed values are: SWT#RIGHT_TO_LEFT or SWT#LEFT_TO_RIGHT
  41          */
  42         public TemplateInformationControlCreator(int orientation) {
  43                 Assert.isLegal(orientation == SWT.RIGHT_TO_LEFT || orientation == SWT.LEFT_TO_RIGHT);
  44                 fOrientation= orientation;
  45         }
  46
  47         /*
  48          * @see org.eclipse.jface.text.IInformationControlCreator#createInformationControl(org.eclipse.swt.widgets.Shell)
  49          */
  50         public IInformationControl createInformationControl(Shell parent) {
  51                 fControl= new SourceViewerInformationControl(parent, false, fOrientation, JavaPlugin.getAdditionalInfoAffordanceString());
  52                 fControl.addDisposeListener(new DisposeListener() {
  53                         public void widgetDisposed(DisposeEvent e) {
  54                                 fControl= null;
  55                         }
  56                 });
  57                 return fControl;
  58         }
  59
  60         /*
  61          * @see org.eclipse.jface.text.IInformationControlCreatorExtension#canReuse(org.eclipse.jface.text.IInformationControl)
  62          */
  63         public boolean canReuse(IInformationControl control) {
  64                 return fControl == control && fControl != null;
  65         }
  66
  67         /*
  68          * @see org.eclipse.jface.text.IInformationControlCreatorExtension#canReplace(org.eclipse.jface.text.IInformationControlCreator)
  69          */
  70         public boolean canReplace(IInformationControlCreator creator) {
  71                 return (creator != null && getClass() == creator.getClass());
  72         }
  73 }