core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/callhierarchy/HistoryAction.java

/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.callhierarchy;

import org.eclipse.dltk.core.DLTKCore;
import org.eclipse.dltk.core.IMethod;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.internal.corext.util.Messages;
import org.eclipse.dltk.ui.ModelElementLabelProvider;
import org.eclipse.dltk.ui.ScriptElementImageProvider;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;


/**
 * Action used for the type hierarchy forward / backward buttons
 */
class HistoryAction extends Action {
    private static ModelElementLabelProvider fLabelProvider = new ModelElementLabelProvider(ModelElementLabelProvider.SHOW_POST_QUALIFIED |
            ModelElementLabelProvider.SHOW_PARAMETERS |
            ModelElementLabelProvider.SHOW_RETURN_TYPE);
    private CallHierarchyViewPart fView;
    private IMethod fMethod;

    public HistoryAction(CallHierarchyViewPart viewPart, IMethod element) {
        super("", AS_RADIO_BUTTON); //$NON-NLS-1$
        fView = viewPart;
        fMethod = element;

        String elementName = getElementLabel(element);
        setText(elementName);
        setImageDescriptor(getImageDescriptor(element));

        setDescription(Messages.format(CallHierarchyMessages.HistoryAction_description, elementName));
        setToolTipText(Messages.format(CallHierarchyMessages.HistoryAction_tooltip, elementName));

//        PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.CALL_HIERARCHY_HISTORY_ACTION);
        if (DLTKCore.DEBUG) {
			System.err.println("Add help support here..."); //$NON-NLS-1$
		}
    }

    private ImageDescriptor getImageDescriptor(IModelElement elem) {
        ScriptElementImageProvider imageProvider = new ScriptElementImageProvider();
        ImageDescriptor desc = imageProvider.getBaseImageDescriptor(elem, 0);
        imageProvider.dispose();

        return desc;
    }

    @Override
	public void run() {
        fView.gotoHistoryEntry(fMethod);
    }

    /**
     * @param element
     * @return String
     */
    private String getElementLabel(IModelElement element) {
        return fLabelProvider.getText(element);
    }
}