org.eclipse.dltk.internal.ui.text.hover.ScriptInformationProvider.java Source code

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Here is the source code for org.eclipse.dltk.internal.ui.text.hover.ScriptInformationProvider.java

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/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
     
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.text.hover;

import org.eclipse.dltk.internal.ui.BrowserInformationControl;
import org.eclipse.dltk.internal.ui.text.HTMLTextPresenter;
import org.eclipse.dltk.internal.ui.text.ScriptWordFinder;
import org.eclipse.dltk.ui.text.hover.IScriptEditorTextHover;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.text.AbstractReusableInformationControlCreator;
import org.eclipse.jface.text.DefaultInformationControl;
import org.eclipse.jface.text.IInformationControl;
import org.eclipse.jface.text.IInformationControlCreator;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.information.IInformationProvider;
import org.eclipse.jface.text.information.IInformationProviderExtension2;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IPartListener;
import org.eclipse.ui.IPerspectiveDescriptor;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;

public class ScriptInformationProvider implements IInformationProvider, IInformationProviderExtension2 {

    class EditorWatcher implements IPartListener {

        public void partOpened(IWorkbenchPart part) {
        }

        public void partDeactivated(IWorkbenchPart part) {
        }

        public void partClosed(IWorkbenchPart part) {
            if (part == fEditor) {
                fEditor.getSite().getWorkbenchWindow().getPartService().removePartListener(fPartListener);
                fPartListener = null;
            }
        }

        public void partActivated(IWorkbenchPart part) {
            update();
        }

        public void partBroughtToTop(IWorkbenchPart part) {
            update();
        }
    }

    protected IEditorPart fEditor;
    protected IPartListener fPartListener;

    protected String fCurrentPerspective;
    protected IScriptEditorTextHover fImplementation;

    /**
     * The presentation control creator.
     */
    private IInformationControlCreator fPresenterControlCreator;

    public ScriptInformationProvider(IEditorPart editor) {

        fEditor = editor;

        if (fEditor != null) {

            fPartListener = new EditorWatcher();
            IWorkbenchWindow window = fEditor.getSite().getWorkbenchWindow();
            window.getPartService().addPartListener(fPartListener);

            update();
        }
    }

    protected void update() {

        IWorkbenchWindow window = fEditor.getSite().getWorkbenchWindow();
        IWorkbenchPage page = window.getActivePage();
        if (page != null) {

            IPerspectiveDescriptor perspective = page.getPerspective();
            if (perspective != null) {
                String perspectiveId = perspective.getId();

                if (fCurrentPerspective == null || fCurrentPerspective != perspectiveId) {
                    fCurrentPerspective = perspectiveId;

                    fImplementation = new ScriptTypeHover();
                    fImplementation.setEditor(fEditor);
                }
            }
        }
    }

    public IRegion getSubject(ITextViewer textViewer, int offset) {

        if (textViewer != null)
            return ScriptWordFinder.findWord(textViewer.getDocument(), offset);

        return null;
    }

    public String getInformation(ITextViewer textViewer, IRegion subject) {
        if (fImplementation != null) {
            String s = fImplementation.getHoverInfo(textViewer, subject);
            if (s != null && s.trim().length() > 0) {
                return s;
            }
        }

        return null;
    }

    public IInformationControlCreator getInformationPresenterControlCreator() {
        if (fPresenterControlCreator == null) {
            fPresenterControlCreator = new AbstractReusableInformationControlCreator() {

                public IInformationControl doCreateInformationControl(Shell parent) {
                    if (BrowserInformationControl.isAvailable(parent))
                        return new BrowserInformationControl(parent, JFaceResources.DIALOG_FONT, true);
                    else
                        return new DefaultInformationControl(parent, new HTMLTextPresenter(false));
                }
            };
        }
        return fPresenterControlCreator;
    }
}