com.aptana.editor.common.properties.CommonEditorPropertySheetPage.java Source code

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Here is the source code for com.aptana.editor.common.properties.CommonEditorPropertySheetPage.java

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/**
 * Aptana Studio
 * Copyright (c) 2005-2011 by Appcelerator, Inc. All Rights Reserved.
 * Licensed under the terms of the GNU Public License (GPL) v3 (with exceptions).
 * Please see the license.html included with this distribution for details.
 * Any modifications to this file must keep this entire header intact.
 */
package com.aptana.editor.common.properties;

import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.jface.viewers.IPostSelectionProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.IPartListener;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.texteditor.AbstractTextEditor;
import org.eclipse.ui.views.properties.PropertySheetPage;

public class CommonEditorPropertySheetPage extends PropertySheetPage {

    private final ISelectionChangedListener selectionChangedListener = new ISelectionChangedListener() {
        public void selectionChanged(SelectionChangedEvent event) {
            textSelectionChanged((ITextSelection) event.getSelection());
        }
    };

    private final IPartListener partListener = new IPartListener() {

        public void partOpened(IWorkbenchPart part) {
        }

        public void partDeactivated(IWorkbenchPart part) {
        }

        public void partClosed(IWorkbenchPart part) {
            removePostSelectionListener();
        }

        public void partBroughtToTop(IWorkbenchPart part) {
        }

        public void partActivated(IWorkbenchPart part) {
        }
    };

    private AbstractTextEditor sourcePart;
    private ISourceViewer viewer;

    public CommonEditorPropertySheetPage(ISourceViewer viewer) {
        this.viewer = viewer;
    }

    private ISourceViewer getViewer() {
        return viewer;
    }

    @Override
    public void selectionChanged(IWorkbenchPart part, ISelection selection) {
        removePostSelectionListener();
        if (selection instanceof ITextSelection && part instanceof AbstractTextEditor) {
            selection = new StructuredSelection(
                    new AdaptableTextSelection(getViewer(), (ITextSelection) selection));
            sourcePart = (AbstractTextEditor) part;
            ((IPostSelectionProvider) sourcePart.getSelectionProvider())
                    .addPostSelectionChangedListener(selectionChangedListener);
            sourcePart.getSite().getPage().addPartListener(partListener);
        }
        super.selectionChanged(part, selection);
    }

    private void textSelectionChanged(ITextSelection textSelection) {
        if (sourcePart != null) {
            ISelection selection = new StructuredSelection(new AdaptableTextSelection(getViewer(), textSelection));
            super.selectionChanged(sourcePart, selection);
        }
    }

    private void removePostSelectionListener() {
        if (sourcePart != null) {
            ((IPostSelectionProvider) sourcePart.getSelectionProvider())
                    .removePostSelectionChangedListener(selectionChangedListener);
            sourcePart = null;
        }
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.ui.views.properties.PropertySheetPage#dispose()
     */
    @Override
    public void dispose() {
        if (sourcePart != null) {
            sourcePart.getSite().getPage().removePartListener(partListener);
        }
        removePostSelectionListener();
        super.dispose();
    }

}