Enable the text editor toolbar items for DiffEditorPage

[egit/eclipse.git] / org.eclipse.egit.ui / src / org / eclipse / egit / ui / internal / commit / CommitEditorActionBarContributor.java

/*******************************************************************************
 * Copyright (C) 2016 Thomas Wolf <thomas.wolf@paranor.ch>.
 *
 * 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.egit.ui.internal.commit;

import java.util.Map;

import org.eclipse.jface.action.IAction;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.IEditorActionBarContributor;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.SubActionBars;
import org.eclipse.ui.editors.text.TextEditorActionContributor;
import org.eclipse.ui.forms.editor.IFormPage;
import org.eclipse.ui.part.MultiPageEditorActionBarContributor;
import org.eclipse.ui.texteditor.ITextEditor;

/**
 * An {@link IEditorActionBarContributor} for the {@link CommitEditor} that
 * provides and properly activates and deactivates a
 * {@link TextEditorActionContributor} for any page that is an
 * {@link ITextEditor}.
 */
public class CommitEditorActionBarContributor
                extends MultiPageEditorActionBarContributor {

        private TextEditorActionContributor textActionContributor = new TextEditorActionContributor();

        private SubActionBars textEditorBars;

        private IFormPage currentPage;

        @Override
        public void init(IActionBars bars) {
                super.init(bars);
                textEditorBars = new SubActionBars(bars);
                textActionContributor.init(textEditorBars);
        }

        @Override
        public void dispose() {
                textActionContributor.dispose();
                textEditorBars.dispose();
                super.dispose();
        }

        @Override
        public void setActivePage(IEditorPart activeEditor) {
                IFormPage formerPage = currentPage;
                if (activeEditor instanceof IFormPage) {
                        currentPage = (IFormPage) activeEditor;
                } else {
                        currentPage = null;
                }
                if (formerPage != null && !formerPage.isEditor()
                                && currentPage != null && !currentPage.isEditor()) {
                        getActionBars().updateActionBars();
                        return;
                }
                boolean isTextEditor = currentPage instanceof ITextEditor;
                if (isTextEditor && currentPage == formerPage) {
                        return;
                }
                getTextEditorActionContributor().setActiveEditor(currentPage);
                updateTextEditorContributions(isTextEditor);
                getActionBars().updateActionBars();
        }

        private void updateTextEditorContributions(boolean activate) {
                IActionBars rootBars = getActionBars();
                rootBars.clearGlobalActionHandlers();
                if (activate) {
                        textEditorBars.activate();
                        Map<?, ?> handlers = textEditorBars.getGlobalActionHandlers();
                        if (handlers != null) {
                                for (Map.Entry<?, ?> entry : handlers.entrySet()) {
                                        Object key = entry.getKey();
                                        Object value = entry.getValue();
                                        if (key instanceof String && value instanceof IAction) {
                                                rootBars.setGlobalActionHandler((String) key,
                                                                (IAction) value);
                                        }
                                }
                        }
                } else {
                        textEditorBars.deactivate();
                }
        }

        /**
         * Gets the nested contributor for {@link ITextEditor}s.
         *
         * @return the {@link IEditorActionBarContributor}
         */
        public IEditorActionBarContributor getTextEditorActionContributor() {
                return textActionContributor;
        }
}