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/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
/**
* Instances of this class represent a taskbar item.
*
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>(none)</dd>
* <dt><b>Events:</b></dt>
* <dd>(none)</dd>
* </dl>
*
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*
* @since 3.6
*
* @noextend This class is not intended to be subclassed by clients.
*/
public class TaskItem extends Item {
TaskBar parent;
Shell shell;
int progress, progressState = SWT.DEFAULT;
Image overlayImage;
String overlayText = "";
Menu menu;
static final int PROGRESS_MAX = 100;
/**
* Constructs a new instance of this class given its parent
* (which must be a <code>Tray</code>) and a style value
* describing its behavior and appearance. The item is added
* to the end of the items maintained by its parent.
* <p>
* The style value is either one of the style constants defined in
* class <code>SWT</code> which is applicable to instances of this
* class, or must be built by <em>bitwise OR</em>'ing together
* (that is, using the <code>int</code> "|" operator) two or more
* of those <code>SWT</code> style constants. The class description
* lists the style constants that are applicable to the class.
* Style bits are also inherited from superclasses.
* </p>
*
* @param parent a composite control which will be the parent of the new instance (cannot be null)
* @param style the style of control to construct
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
* <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
* </ul>
*
* @see SWT
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
TaskItem (TaskBar parent, int style) {
super (parent, style);
this.parent = parent;
parent.createItem (this, -1);
}
protected void checkSubclass () {
if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS);
}
void destroyWidget () {
parent.destroyItem (this);
releaseHandle ();
}
public Menu getMenu () {
checkWidget ();
return menu;
}
public Image getOverlayImage () {
checkWidget();
return overlayImage;
}
public String getOverlayText () {
checkWidget();
return overlayText;
}
/**
* Returns the receiver's parent, which must be a <code>TaskBar</code>.
*
* @return the receiver's parent
*
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*
*/
public TaskBar getParent () {
checkWidget ();
return parent;
}
public int getProgress () {
checkWidget ();
return progress;
}
public int getProgressState () {
checkWidget ();
return progressState;
}
void releaseHandle () {
super.releaseHandle ();
parent = null;
}
void releaseWidget () {
super.releaseWidget ();
overlayImage = null;
overlayText = null;
}
public void setMenu (Menu menu) {
checkWidget ();
if (menu != null) {
if (menu.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if ((menu.style & SWT.POP_UP) == 0) {
error (SWT.ERROR_MENU_NOT_POP_UP);
}
}
this.menu = menu;
}
/**
* Sets the receiver's overlay image.
*
* @param overlayImage the new overlay image
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*/
public void setOverlayImage (Image overlayImage) {
checkWidget ();
if (overlayImage != null && overlayImage.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
this.overlayImage = overlayImage;
}
public void setOverlayText (String overlayText) {
checkWidget ();
if (overlayText == null) error (SWT.ERROR_NULL_ARGUMENT);
this.overlayText = overlayText;
}
public void setProgressState (int progressState) {
checkWidget ();
if (this.progressState == progressState) return;
this.progressState = progressState;
}
public void setProgress (int progress) {
checkWidget ();
progress = Math.max(0, Math.min(progress, PROGRESS_MAX));
if (this.progress == progress) return;
this.progress = progress;
}
}
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