source: trunk/doc/src/widgets-and-layouts/widgets.qdoc@ 561

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

/*!
    \page widgets-and-layouts.html
    \title Widgets and Layouts

    \ingroup frameworks-technologies

    \nextpage Widget Classes

    The primary elements for designing user interfaces in Qt are widgets and layouts.
    
    \section1 Widgets

    \l{Widget Classes}{Widgets} can display data and status information, receive
    user input, and provide a container for other widgets that should be grouped
    together. A widget that is not embedded in a parent widget is called a
    \l{Application Windows and Dialogs}{window}.

    \image parent-child-widgets.png A parent widget containing various child widgets.

    The QWidget class provides the basic capability to render to the screen, and to
    handle user input events. All UI elements that Qt provides are either subclasses
    of QWidget, or are used in connection with a QWidget subclass. Creating custom
    widgets is done by subclassing QWidget or a suitable subclass and reimplementing
    the virtual event handlers.

    \section1 Layouts

    \l{Layout Management}{Layouts} are an elegant and flexible way to automatically
    arrange child widgets within their container. Each widget reports its size requirements
    to the layout through the \l{QWidget::}{sizeHint} and \l{QWidget::}{sizePolicy}
    properties, and the layout distributes the available space accordingly.

    \table
    \row    
    \o \image qgridlayout-with-5-children.png
    \o \image qformlayout-with-6-children.png
    \endtable

    \l{Qt Designer Manual}{\QD} is a powerful tool for interactively creating and
    arranging widgets in layouts.

    \section1 Widget Styles

    \l{Implementing Styles and Style Aware Widgets}{Styles} draw on behalf of widgets
    and encapsulate the look and feel of a GUI. Qt's built-in widgets use the QStyle
    class to perform nearly all of their drawing, ensuring that they look exactly like
    the equivalent native widgets.
    
    \table
    \row
    \o \image windowsxp-tabwidget.png
    \o \image plastique-tabwidget.png
    \o \image macintosh-tabwidget.png
    \endtable

    \l{Qt Style Sheets} are a powerful mechanism that allows you to customize the
    appearance of widgets, in addition to what is already possible by subclassing QStyle.
*/

/*!
    \page widget-classes.html
    \title Widget Classes

    \contentspage Widgets and Layouts
    \nextpage Layout Management

    Below you find a list of all widget classes in Qt. You can also browse the
    widget classes Qt provides in the various supported styles in the
    \l{Qt Widget Gallery}.

    \tableofcontents

    \section1 Basic Widgets

    These basic widgets (controls), such as buttons, comboboxes and scroll bars, are
    designed for direct use.

    \table
    \row
    \o \image windows-label.png
    \o \image windowsvista-pushbutton.png
    \o \image gtk-progressbar.png
    \row
    \o \image plastique-combobox.png
    \o \image macintosh-radiobutton.png
    \o \image cde-lineedit.png
    \endtable

    \annotatedlist basicwidgets

    \section1 Advanced Widgets

    Advanced GUI widgets such as tab widgets and progress bars provide more
    complex user interface controls.

    \table
    \row
    \o \image windowsxp-treeview.png
    \o \image gtk-calendarwidget.png
    \o \image qundoview.png
    \endtable

    \annotatedlist advanced

    \table
    \row
    \o \image windowsvista-tabwidget.png 
    \o \image macintosh-groupbox.png
    \endtable

    \section1 Organizer Widgets

    Classes like splitters, tab bars, button groups, etc are used to
    organize and group GUI primitives into more complex applications or
    dialogs.

    \annotatedlist organizers

    \section1 Abstract Widget Classes

    Abstract widget classes usable through subclassing. They are generally
    not usable in themselves, but provide functionality that can be used
    by inheriting these classes.

    \annotatedlist abstractwidgets
*/

/*!
    \group advanced
    \title Advanced Widgets
*/

/*!
    \group abstractwidgets
    \title Abstract Widget Classes
*/

/*!
    \group basicwidgets
    \title Basic Widgets
*/

/*!
    \group organizers
    \title Organizers
*/