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<h1 class="title">Widgets and Layouts</h1>
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<h2>Widgets</h2>
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<p>Widgets are the primary elements for creating user interfaces in Qt. <a href="#the-widget-classes">Widgets</a> 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 <a href="application-windows.html">window</a>.</p>
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<p class="centerAlign"><img src="images/parent-child-widgets.png" alt="A parent widget containing various child widgets." /></p><p>The <a href="qwidget.html">QWidget</a> 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 <a href="qwidget.html">QWidget</a>, or are used in connection with a <a href="qwidget.html">QWidget</a> subclass. Creating custom widgets is done by subclassing <a href="qwidget.html">QWidget</a> or a suitable subclass and reimplementing the virtual event handlers.</p>
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<h2>Layouts</h2>
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<p><a href="layout.html">Layouts</a> 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 <a href="qwidget.html#sizeHint-prop">sizeHint</a> and <a href="qwidget.html#sizePolicy-prop">sizePolicy</a> properties, and the layout distributes the available space accordingly.</p>
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<p><a href="designer-manual.html"><i>Qt Designer</i></a> is a powerful tool for interactively creating and arranging widgets in layouts.</p>
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<a name="widget-styles"></a>
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<h2>Widget Styles</h2>
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<p><a href="style-reference.html">Styles</a> draw on behalf of widgets and encapsulate the look and feel of a GUI. Qt's built-in widgets use the <a href="qstyle.html">QStyle</a> class to perform nearly all of their drawing, ensuring that they look exactly like the equivalent native widgets.</p>
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<table class="generic">
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<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/windowsxp-tabwidget.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/plastique-tabwidget.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/macintosh-tabwidget.png" alt="" /></p></td></tr>
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</table>
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<p><a href="stylesheet.html">Qt Style Sheets</a> are a powerful mechanism that allows you to customize the appearance of widgets, in addition to what is already possible by subclassing <a href="qstyle.html">QStyle</a>.</p>
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<a name="the-widget-classes"></a>
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<h2>The Widget Classes</h2>
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<p>The following sections list the widget classes. See the <a href="gallery.html">Qt Widget Gallery</a> for some examples.</p>
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<a name="basic-widgets"></a>
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<h3>Basic Widgets</h3>
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<p>These basic widgets (controls), e.g. buttons, comboboxes and scroll bars, are designed for direct use.</p>
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<table class="generic">
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<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/windows-label.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/windowsvista-pushbutton.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/gtk-progressbar.png" alt="" /></p></td></tr>
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<tr valign="top" class="even"><td ><p class="centerAlign"><img src="images/plastique-combobox.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/macintosh-radiobutton.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/cde-lineedit.png" alt="" /></p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qcheckbox.html">QCheckBox</a></p></td><td class="tblDescr"><p>Checkbox with a text label</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qcombobox.html">QComboBox</a></p></td><td class="tblDescr"><p>Combined button and popup list</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qcommandlinkbutton.html">QCommandLinkButton</a></p></td><td class="tblDescr"><p>Vista style command link button</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qdateedit.html">QDateEdit</a></p></td><td class="tblDescr"><p>Widget for editing dates based on the QDateTimeEdit widget</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qdatetimeedit.html">QDateTimeEdit</a></p></td><td class="tblDescr"><p>Widget for editing dates and times</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qdial.html">QDial</a></p></td><td class="tblDescr"><p>Rounded range control (like a speedometer or potentiometer)</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qdoublespinbox.html">QDoubleSpinBox</a></p></td><td class="tblDescr"><p>Spin box widget that takes doubles</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qfocusframe.html">QFocusFrame</a></p></td><td class="tblDescr"><p>Focus frame which can be outside of a widget's normal paintable area</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qfontcombobox.html">QFontComboBox</a></p></td><td class="tblDescr"><p>Combobox that lets the user select a font family</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qlcdnumber.html">QLCDNumber</a></p></td><td class="tblDescr"><p>Displays a number with LCD-like digits</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qlabel.html">QLabel</a></p></td><td class="tblDescr"><p>Text or image display</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qmenu.html">QMenu</a></p></td><td class="tblDescr"><p>Menu widget for use in menu bars, context menus, and other popup menus</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qprogressbar.html">QProgressBar</a></p></td><td class="tblDescr"><p>Horizontal or vertical progress bar</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qpushbutton.html">QPushButton</a></p></td><td class="tblDescr"><p>Command button</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qradiobutton.html">QRadioButton</a></p></td><td class="tblDescr"><p>Radio button with a text label</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qscrollarea.html">QScrollArea</a></p></td><td class="tblDescr"><p>Scrolling view onto another widget</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qscrollbar.html">QScrollBar</a></p></td><td class="tblDescr"><p>Vertical or horizontal scroll bar</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qsizegrip.html">QSizeGrip</a></p></td><td class="tblDescr"><p>Resize handle for resizing top-level windows</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qslider.html">QSlider</a></p></td><td class="tblDescr"><p>Vertical or horizontal slider</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qspinbox.html">QSpinBox</a></p></td><td class="tblDescr"><p>Spin box widget</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qtabbar.html">QTabBar</a></p></td><td class="tblDescr"><p>Tab bar, e.g. for use in tabbed dialogs</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qtabwidget.html">QTabWidget</a></p></td><td class="tblDescr"><p>Stack of tabbed widgets</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qtimeedit.html">QTimeEdit</a></p></td><td class="tblDescr"><p>Widget for editing times based on the QDateTimeEdit widget</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qtoolbox.html">QToolBox</a></p></td><td class="tblDescr"><p>Column of tabbed widget items</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qtoolbutton.html">QToolButton</a></p></td><td class="tblDescr"><p>Quick-access button to commands or options, usually used inside a QToolBar</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qwidget.html">QWidget</a></p></td><td class="tblDescr"><p>The base class of all user interface objects</p></td></tr>
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</table>
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<a name="advanced-widgets"></a>
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<h3>Advanced Widgets</h3>
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<p>Advanced GUI widgets, e.g. tab widgets and progress bars, provide more complex user interface controls.</p>
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<table class="generic">
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<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/windowsxp-treeview.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/gtk-calendarwidget.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/qundoview.png" alt="" /></p></td></tr>
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<table class="annotated">
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<tr class="odd topAlign"><td class="tblName"><p><a href="qcalendarwidget.html">QCalendarWidget</a></p></td><td class="tblDescr"><p>Monthly based calendar widget allowing the user to select a date</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qcolumnview.html">QColumnView</a></p></td><td class="tblDescr"><p>Model/view implementation of a column view</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qdatawidgetmapper.html">QDataWidgetMapper</a></p></td><td class="tblDescr"><p>Mapping between a section of a data model to widgets</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qdesktopwidget.html">QDesktopWidget</a></p></td><td class="tblDescr"><p>Access to screen information on multi-head systems</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qlistview.html">QListView</a></p></td><td class="tblDescr"><p>List or icon view onto a model</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qmaccocoaviewcontainer.html">QMacCocoaViewContainer</a></p></td><td class="tblDescr"><p>Widget for Mac OS X that can be used to wrap arbitrary Cocoa views (i.e., NSView subclasses) and insert them into Qt hierarchies</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qmacnativewidget.html">QMacNativeWidget</a></p></td><td class="tblDescr"><p>Widget for Mac OS X that provides a way to put Qt widgets into Carbon or Cocoa hierarchies depending on how Qt was configured</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qtableview.html">QTableView</a></p></td><td class="tblDescr"><p>Default model/view implementation of a table view</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qtreeview.html">QTreeView</a></p></td><td class="tblDescr"><p>Default model/view implementation of a tree view</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qundoview.html">QUndoView</a></p></td><td class="tblDescr"><p>Displays the contents of a QUndoStack</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qwsembedwidget.html">QWSEmbedWidget</a></p></td><td class="tblDescr"><p>Enables embedded top-level widgets in Qt for Embedded Linux</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qwebview.html">QWebView</a></p></td><td class="tblDescr"><p>Widget that is used to view and edit web documents</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qx11embedcontainer.html">QX11EmbedContainer</a></p></td><td class="tblDescr"><p>XEmbed container widget</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qx11embedwidget.html">QX11EmbedWidget</a></p></td><td class="tblDescr"><p>XEmbed client widget</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="phonon-videowidget.html">Phonon::VideoWidget</a></p></td><td class="tblDescr"><p>Widget that is used to display video</p></td></tr>
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</table>
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<table class="generic">
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<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/windowsvista-tabwidget.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/macintosh-groupbox.png" alt="" /></p></td></tr>
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</table>
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<a name="organizer-widgets"></a>
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<h3>Organizer Widgets</h3>
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<p>Classes like splitters, tab bars, button groups, etc are used for organizing and grouping GUI primitives into more complex applications and dialogs.</p>
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<table class="annotated">
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<tr class="odd topAlign"><td class="tblName"><p><a href="qbuttongroup.html">QButtonGroup</a></p></td><td class="tblDescr"><p>Container to organize groups of button widgets</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qgroupbox.html">QGroupBox</a></p></td><td class="tblDescr"><p>Group box frame with a title</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qsplitter.html">QSplitter</a></p></td><td class="tblDescr"><p>Implements a splitter widget</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qsplitterhandle.html">QSplitterHandle</a></p></td><td class="tblDescr"><p>Handle functionality of the splitter</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qstackedwidget.html">QStackedWidget</a></p></td><td class="tblDescr"><p>Stack of widgets where only one widget is visible at a time</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qtabwidget.html">QTabWidget</a></p></td><td class="tblDescr"><p>Stack of tabbed widgets</p></td></tr>
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</table>
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|
<a name="abstract-widget-classes"></a>
|
|
<h3>Abstract Widget Classes</h3>
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|
<p>The abstract widget classes are base classes. They are not usable as standalone classes but provide functionality when they are subclassed.</p>
|
|
<table class="annotated">
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|
<tr class="odd topAlign"><td class="tblName"><p><a href="qabstractbutton.html">QAbstractButton</a></p></td><td class="tblDescr"><p>The abstract base class of button widgets, providing functionality common to buttons</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qabstractscrollarea.html">QAbstractScrollArea</a></p></td><td class="tblDescr"><p>Scrolling area with on-demand scroll bars</p></td></tr>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qabstractslider.html">QAbstractSlider</a></p></td><td class="tblDescr"><p>Integer value within a range</p></td></tr>
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<tr class="even topAlign"><td class="tblName"><p><a href="qabstractspinbox.html">QAbstractSpinBox</a></p></td><td class="tblDescr"><p>Spinbox and a line edit to display values</p></td></tr>
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|
<tr class="odd topAlign"><td class="tblName"><p><a href="qdialog.html">QDialog</a></p></td><td class="tblDescr"><p>The base class of dialog windows</p></td></tr>
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|
<tr class="even topAlign"><td class="tblName"><p><a href="qframe.html">QFrame</a></p></td><td class="tblDescr"><p>The base class of widgets that can have a frame</p></td></tr>
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|
</table>
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|
</div>
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|
<!-- @@@widgets-and-layouts.html -->
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<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
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The documentation provided herein is licensed under the terms of the
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Documentation sources may be obtained from <a href="http://www.qt-project.org">
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Qt and respective logos are trademarks of The Qt Company Ltd
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