gecko-dev/widget/nsITaskbarPreviewController...

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Rob Arnold <tellrob@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* decision by deleting the provisions above and replace them with the notice
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* the provisions above, a recipient may use your version of this file under
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* ***** END LICENSE BLOCK ***** */
#include "nsISupports.idl"
interface nsIDocShell;
interface nsIDOMCanvasRenderingContext2D;
interface nsITaskbarPreview;
interface nsITaskbarPreviewButton;
/**
* nsITaskbarPreviewController
*
* nsITaskbarPreviewController provides the behavior for the taskbar previews.
* Its methods and properties are used by nsITaskbarPreview. Clients are
* intended to provide their own implementation of this interface. Depending on
* the interface the controller is attached to, only certain methods/attributes
* are required to be implemented.
*/
[scriptable, uuid(4FC0AFBB-3E22-4FBA-AC21-953350AF0411)]
interface nsITaskbarPreviewController : nsISupports
{
/**
* The width of the preview image. This value is allowed to change at any
* time. See drawPreview for more information.
*/
readonly attribute unsigned long width;
/**
* The height of the preview image. This value is allowed to change at any
* time. See drawPreview for more information.
*/
readonly attribute unsigned long height;
/**
* The aspect ratio of the thumbnail - this does not need to match the ratio
* of the preview. This value is allowed to change at any time. See
* drawThumbnail for more information.
*/
readonly attribute float thumbnailAspectRatio;
/**
* Invoked by nsITaskbarPreview when it needs to render the preview. The
* context is attached to a surface with the controller's width and height
* which are obtained immediately before the call.
*
* Note that the context is not attached to a canvas element.
*
* @param ctx Canvas drawing context
*/
boolean drawPreview(in nsIDOMCanvasRenderingContext2D ctx);
/**
* Invoked by the taskbar preview when it needs to draw the thumbnail in the
* taskbar's application preview window.
*
* Note: it is guaranteed that width/height == thumbnailAspectRatio
* (modulo rounding errors)
*
* Also note that the context is not attached to a canvas element.
*
* @param ctx Canvas drawing context
* @param width The width of the surface backing the drawing context
* @param height The height of the surface backing the drawing context
*/
boolean drawThumbnail(in nsIDOMCanvasRenderingContext2D ctx, in unsigned long width, in unsigned long height);
/**
* Invoked when the user presses the close button on the tab preview.
*/
void onClose();
/**
* Invoked when the user clicks on the tab preview.
*
* @return true if the top level window corresponding to the preview should
* be activated, false if activation is not accepted.
*/
boolean onActivate();
/**
* Invoked when one of the buttons on the window preview's toolbar is pressed.
*
* @param button The button that was pressed. This can be compared with the
* buttons returned by nsITaskbarWindowPreview.getButton.
*/
void onClick(in nsITaskbarPreviewButton button);
};