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/*******************************************************************************
* Copyright (c) 2004 - 2005 University Of British Columbia 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
*
* Contributors:
* University Of British Columbia - initial API and implementation
*******************************************************************************/
package org.eclipse.mylar.tasklist.ui.actions;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IMenuCreator;
import org.eclipse.mylar.tasklist.ITask;
import org.eclipse.mylar.tasklist.TaskListImages;
import org.eclipse.mylar.tasklist.ui.views.TaskActivationHistory;
import org.eclipse.mylar.tasklist.ui.views.TaskListLabelProvider;
import org.eclipse.mylar.tasklist.ui.views.TaskListView;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Menu;
/**
* This abstract class contains some common code used by
* NextTaskDropDownAction and PreviousTaskDropDownAction
*
* @author Wesley Coelho
*/
public abstract class DropDownTaskNavigateAction extends Action implements IMenuCreator{
protected final TaskListView view;
protected TaskActivationHistory taskHistory;
protected Menu dropDownMenu = null;
protected TaskListLabelProvider labelProvider = new TaskListLabelProvider();
/** Maximum number of items to appear in the drop-down menu */
protected final static int MAX_ITEMS = 5;
public DropDownTaskNavigateAction(TaskListView view, TaskActivationHistory history){
super();
this.view = view;
taskHistory = history;
setMenuCreator(this);
}
/**
* Action for navigating to a specified task.
* This class should be protected but has been
* made public for testing only
*/
public class TaskNavigateAction extends Action {
private ITask targetTask;
private static final int MAX_LABEL_LENGTH = 40;
public TaskNavigateAction(ITask task){
targetTask = task;
String taskDescription = task.getDescription(true);
if(taskDescription.length() > MAX_LABEL_LENGTH){
taskDescription = taskDescription.subSequence(0, MAX_LABEL_LENGTH - 3) + "...";
}
setText(taskDescription);
setEnabled(true);
setToolTipText(task.getDescription(true));
Image image = labelProvider.getColumnImage(task, 1);
setImageDescriptor(TaskListImages.getImageDescriptor(image));
}
public void run(){
new TaskActivateAction(targetTask).run();
taskHistory.navigatedToTask(targetTask); //Notify the task history of arbitrary history navigation
setButtonStatus();
view.getViewer().refresh();
}
}
public void dispose() {
if (dropDownMenu != null) {
dropDownMenu.dispose();
dropDownMenu = null;
}
}
public Menu getMenu(Control parent) {
if (dropDownMenu != null) {
dropDownMenu.dispose();
}
dropDownMenu = new Menu(parent);
addActionsToMenu();
return dropDownMenu;
}
public Menu getMenu(Menu parent) {
if (dropDownMenu != null) {
dropDownMenu.dispose();
}
dropDownMenu = new Menu(parent);
addActionsToMenu();
return dropDownMenu;
}
protected void setButtonStatus(){
view.getPreviousTaskAction().setEnabled(taskHistory.hasPrevious());
view.getNextTaskAction().setEnabled(taskHistory.hasNext());
}
protected abstract void addActionsToMenu();
}
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