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/****************************************************************************
**
** Copyright (C) 2013 Ivan Vizir <define-true-false@yandex.com>
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page qtwinextras-Overview.html
\title Qt Windows Extras Overview
\brief Qt Windows Extras provides classes and functions for using some
Windows APIs in a Qt way
Qt Windows Extras provide classes and functions that enable you to use
miscellaneous Windows-specific functions. For example, you can convert Qt
objects to Windows object handles and manipulate DWM glass frames.
In addition, you can use features introduced with Windows 7, such as Aero
Peek, Jump Lists, a progress indicator on a taskbar button, or a thumbnail
toolbar.
\section1 Type Conversion
The QtWin namespace provides functions to convert Qt objects of classes
such as QPixmap or QImage to Windows HBITMAP or HICON handles, and vice
versa.
\section1 DWM and Glass Frame
You can determine whether a window is included in the DWM Flip3D rendering.
The glass frame that was first introduced with Windows Vista can be easily
manipulated using the QtWin::extendFrameIntoClientArea() and
QtWin::enableBlurBehindWindow() functions. Windows 8 lost the glass
effect, but applications can still integrate their windows into the system
frame to visually separate window controls from the rest of the window or to
focus the user's attention on window content.
\image glass.png "Glass frame extended into client area of a window"
\section1 Aero Peek
The Windows 7 \b {Aero Peek} feature gives the users the powers of X-ray
vision that enable them to peek past all open windows straight at the
desktop and the gadgets placed there. They can view the contents of a window
without actually switching to it. You can enable Aero Peek for a
gadget-like window or for a window that constantly displays monitoring data.
You can use the QtWin::setWindowExcludedFromPeek() function to exclude
an application window from Aero Peek.
\note Aero Peek is disabled in Windows 8 by default but can be enabled
by the user.
\image peek-on.png "A window excluded from Aero Peek"
\section1 Taskbar
The taskbar provides users with access to applications that are open on the
desktop. Windows automatically creates buttons on the taskbar for accessing
application windows. Windows 7 adds new features to the taskbar buttons
that are discussed in the following sections.
\section2 Overlay Icons and Progress Indicators
You can use the QWinTaskbarButton class to set an overlay icon and the
QWinTaskbarProgress class to display a progress indicator on a taskbar button.
An overlay icon indicates change in the state of the application. A progress
indicator shows how time-consuming tasks are progressing.
\image taskbar-button.png Taskbar Button
\section3 Taskbar Example
The following example code illustrates how to use the QWinTaskbarButton
and QWinTaskbarProgress classes to adjust the look of the taskbar button:
\snippet code/taskbar.cpp taskbar_cpp
\section2 Jump Lists
An application can use Jump Lists to provide users with faster access to
files or to display shortcuts to tasks or commands.
\image jumplist.png Jump List
\list
\li \b Destinations — categorized shortcuts to files and URLs that the
application can handle and even links to other applications.
Windows provides two standard categories that can be added to the
custom Jump List, in addition to the ones that the application can
create itself.
\li \b Recent and \b Frequent — so called \e known categories that are
populated automatically by Windows when the application uses the
QFileDialog::getOpenFileName() function or when the application is
launched to open a file from the Windows shell.
\li \b Tasks — shortcuts to application functionality. An application
can display its most frequently used context-independent functions
on task lists.
\endlist
\note To be able to add destinations to its Jump Lists, the application
should associate itself with the file types it can handle.
\section3 Jump List Example
The following example code illustrates how to use the classes in the
QWinJumpList and QWinJumpListItem classes to implement Jump Lists:
\snippet code/jumplist.cpp jumplist
\section2 Thumbnail Toolbar
Applications can embed a toolbar in the thumbnail of a window, which is
shown when hovering over its taskbar icon. A thumbnail toolbar may provide
quick access to the window's commands without requiring the user to restore
or activate the window.
\image thumbbar.png Media player thumbnail toolbar
\section3 Thumbnail Toolbar Example
The following example code illustrates how to use the functions in the
QWinThumbnailToolBar and QWinThumbnailToolButton class to implement a
thumbnail toolbar:
\snippet code/thumbbar.cpp thumbbar_cpp
*/
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