org.eclipse.xtend.ide.highlighting.ShowWhitespaceCharactersActionContributor.java Source code

Introduction

Here is the source code for org.eclipse.xtend.ide.highlighting.ShowWhitespaceCharactersActionContributor.java

Source

/*******************************************************************************
 * Copyright (c) 2011, 2016 itemis AG (http://www.itemis.eu) 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.xtend.ide.highlighting;

import org.eclipse.jface.action.ActionContributionItem;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.action.IContributionItem;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.ui.texteditor.ITextEditorActionConstants;
import org.eclipse.ui.texteditor.ShowWhitespaceCharactersAction;
import org.eclipse.xtext.ui.IImageHelper.IImageDescriptorHelper;
import org.eclipse.xtext.ui.editor.XtextEditor;
import org.eclipse.xtext.ui.editor.actions.IActionContributor;

import com.google.inject.Inject;
import com.google.inject.Singleton;

/**
 * @author Jan Koehnlein - Initial contribution and API
 */
@Singleton
public class ShowWhitespaceCharactersActionContributor implements IActionContributor {

    private final class ActionContributionItemExtension extends ActionContributionItem {
        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 0;
            result = prime * result + ((id == null) ? 0 : id.hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (getClass() != obj.getClass())
                return false;
            ActionContributionItemExtension other = (ActionContributionItemExtension) obj;
            if (id == null) {
                if (other.id != null)
                    return false;
            } else if (!id.equals(other.id))
                return false;
            return true;
        }

        final String id;

        private ActionContributionItemExtension(IAction action) {
            super(action);
            this.id = action.getId();
        }

    }

    @Inject
    private IImageDescriptorHelper imageHelper;

    @Override
    public void contributeActions(XtextEditor editor) {
        IToolBarManager toolBarManager = editor.getEditorSite().getActionBars().getToolBarManager();
        IAction action = editor.getAction(ITextEditorActionConstants.SHOW_WHITESPACE_CHARACTERS);
        action.setImageDescriptor(imageHelper.getImageDescriptor("full/etool16/show_whitespace_chars.gif"));
        action.setDisabledImageDescriptor(imageHelper.getImageDescriptor("full/dtool16/show_whitespace_chars.gif"));
        if (toolBarManager.find(action.getId()) == null) {
            toolBarManager.add(new ActionContributionItemExtension(action));
            //         toolBarManager.add(action);            
        }
    }

    @Override
    public void editorDisposed(XtextEditor editor) {
        IToolBarManager toolBarManager = editor.getEditorSite().getActionBars().getToolBarManager();
        IContributionItem i = toolBarManager.remove(ITextEditorActionConstants.SHOW_WHITESPACE_CHARACTERS);
        if (i instanceof ActionContributionItem) {
            IAction action = ((ActionContributionItem) i).getAction();
            if (action instanceof ShowWhitespaceCharactersAction) {
                ((ShowWhitespaceCharactersAction) action).setEditor(null);
            }
        }
    }

}