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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">QAbstractScrollArea Class Reference</h1>

<p>The QAbstractScrollArea widget provides a scrolling area with on-demand scroll bars. <a href="#details">More...</a></p>

<pre>#include <QAbstractScrollArea></pre><p>Part of the <a href="qtgui.html">QtGui</a> module.</p>

<p>Inherits <a href="qframe.html">QFrame</a>.</p>

<p>Inherited by <a href="qabstractitemview.html">QAbstractItemView</a>, <a href="qscrollarea.html">QScrollArea</a>, and <a href="qtextedit.html">QTextEdit</a>.</p>

<ul>

<li><a href="qabstractscrollarea-members.html">List of all members, including inherited members</a></li>

</ul>

<h3>Properties</h3>

<ul>

<li><div class="fn"/><b><a href="qabstractscrollarea.html#horizontalScrollBarPolicy-prop">horizontalScrollBarPolicy</a></b> : Qt::ScrollBarPolicy</li>

<li><div class="fn"/><b><a href="qabstractscrollarea.html#verticalScrollBarPolicy-prop">verticalScrollBarPolicy</a></b> : Qt::ScrollBarPolicy</li>

</ul>

<ul>

<li><div class="fn"/>6 properties inherited from <a href="qframe.html#properties">QFrame</a></li>

<li><div class="fn"/>52 properties inherited from <a href="qwidget.html#properties">QWidget</a></li>

<li><div class="fn"/>1 property inherited from <a href="qobject.html#properties">QObject</a></li>

</ul>

<h3>Public Functions</h3>

<ul>

<li><div class="fn"/><b><a href="qabstractscrollarea.html#QAbstractScrollArea">QAbstractScrollArea</a></b> ( QWidget * <i>parent</i> = 0 )</li>

<li><div class="fn"/><b><a href="qabstractscrollarea.html#dtor.QAbstractScrollArea">~QAbstractScrollArea</a></b> ()</li>

<li><div class="fn"/>QScrollBar * <b><a href="qabstractscrollarea.html#horizontalScrollBar">horizontalScrollBar</a></b> () const</li>

<li><div class="fn"/>Qt::ScrollBarPolicy <b><a href="qabstractscrollarea.html#horizontalScrollBarPolicy-prop">horizontalScrollBarPolicy</a></b> () const</li>

<li><div class="fn"/>QSize <b><a href="qabstractscrollarea.html#maximumViewportSize">maximumViewportSize</a></b> () const</li>

<li><div class="fn"/>void <b><a href="qabstractscrollarea.html#horizontalScrollBarPolicy-prop">setHorizontalScrollBarPolicy</a></b> ( Qt::ScrollBarPolicy )</li>

<li><div class="fn"/>void <b><a href="qabstractscrollarea.html#verticalScrollBarPolicy-prop">setVerticalScrollBarPolicy</a></b> ( Qt::ScrollBarPolicy )</li>

<li><div class="fn"/>QScrollBar * <b><a href="qabstractscrollarea.html#verticalScrollBar">verticalScrollBar</a></b> () const</li>

<li><div class="fn"/>Qt::ScrollBarPolicy <b><a href="qabstractscrollarea.html#verticalScrollBarPolicy-prop">verticalScrollBarPolicy</a></b> () const</li>

<li><div class="fn"/>QWidget * <b><a href="qabstractscrollarea.html#viewport">viewport</a></b> () const</li>

</ul>

<ul>

<li><div class="fn"/>13 public functions inherited from <a href="qframe.html#public-functions">QFrame</a></li>

<li><div class="fn"/>183 public functions inherited from <a href="qwidget.html#public-functions">QWidget</a></li>

<li><div class="fn"/>28 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>

<li><div class="fn"/>10 public functions inherited from <a href="qpaintdevice.html#public-functions">QPaintDevice</a></li>

</ul>

<h3>Protected Functions</h3>

<ul>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#contextMenuEvent">contextMenuEvent</a></b> ( QContextMenuEvent * <i>e</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#dragEnterEvent">dragEnterEvent</a></b> ( QDragEnterEvent * <i>event</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#dragLeaveEvent">dragLeaveEvent</a></b> ( QDragLeaveEvent * <i>event</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#dragMoveEvent">dragMoveEvent</a></b> ( QDragMoveEvent * <i>event</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#dropEvent">dropEvent</a></b> ( QDropEvent * <i>event</i> )</li>

<li><div class="fn"/>virtual bool <b><a href="qabstractscrollarea.html#event">event</a></b> ( QEvent * <i>e</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#keyPressEvent">keyPressEvent</a></b> ( QKeyEvent * <i>e</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#mouseDoubleClickEvent">mouseDoubleClickEvent</a></b> ( QMouseEvent * <i>e</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#mouseMoveEvent">mouseMoveEvent</a></b> ( QMouseEvent * <i>e</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#mousePressEvent">mousePressEvent</a></b> ( QMouseEvent * <i>e</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#mouseReleaseEvent">mouseReleaseEvent</a></b> ( QMouseEvent * <i>e</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#paintEvent">paintEvent</a></b> ( QPaintEvent * <i>event</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#resizeEvent">resizeEvent</a></b> ( QResizeEvent * <i>event</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#scrollContentsBy">scrollContentsBy</a></b> ( int <i>dx</i>, int <i>dy</i> )</li>

<li><div class="fn"/>void <b><a href="qabstractscrollarea.html#setViewportMargins">setViewportMargins</a></b> ( int <i>left</i>, int <i>top</i>, int <i>right</i>, int <i>bottom</i> )</li>

<li><div class="fn"/>virtual bool <b><a href="qabstractscrollarea.html#viewportEvent">viewportEvent</a></b> ( QEvent * <i>e</i> )</li>

<li><div class="fn"/>virtual void <b><a href="qabstractscrollarea.html#wheelEvent">wheelEvent</a></b> ( QWheelEvent * <i>e</i> )</li>

</ul>

<ul>

<li><div class="fn"/>39 protected functions inherited from <a href="qwidget.html#protected-functions">QWidget</a></li>

<li><div class="fn"/>7 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>

</ul>

<h3>Additional Inherited Members</h3>

<ul>

<li><div class="fn"/>17 public slots inherited from <a href="qwidget.html#public-slots">QWidget</a></li>

<li><div class="fn"/>1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>

<li><div class="fn"/>1 signal inherited from <a href="qwidget.html#signals">QWidget</a></li>

<li><div class="fn"/>1 signal inherited from <a href="qobject.html#signals">QObject</a></li>

<li><div class="fn"/>2 static public members inherited from <a href="qframe.html#static-public-members">QFrame</a></li>

<li><div class="fn"/>4 static public members inherited from <a href="qwidget.html#static-public-members">QWidget</a></li>

<li><div class="fn"/>4 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>

</ul>

<hr />

<h2>Detailed Description</h2>

<p>The QAbstractScrollArea widget provides a scrolling area with on-demand scroll bars.</p>

<p>QAbstractScrollArea is a low-level abstraction of a scrolling area. It gives you full control of the scroll bars, at the cost of simplicity. In most cases, using a <a href="qscrollarea.html">QScrollArea</a> is preferable.</p>

<p>QAbstractScrollArea's central child widget is the scrolling area itself, called <a href="qabstractscrollarea.html#viewport">viewport</a>(). The viewport widget uses all available space. Next to the viewport is a vertical scroll bar (accessible with <a href="qabstractscrollarea.html#verticalScrollBar">verticalScrollBar</a>()), and below a horizontal scroll bar (accessible with <a href="qabstractscrollarea.html#horizontalScrollBar">horizontalScrollBar</a>()). Each scroll bar can be either visible or hidden, depending on the scroll bar's policy (see <a href="qabstractscrollarea.html#verticalScrollBarPolicy-prop">verticalScrollBarPolicy</a> and <a href="qabstractscrollarea.html#horizontalScrollBarPolicy-prop">horizontalScrollBarPolicy</a>). When a scroll bar is hidden, the viewport expands in order to cover all available space. When a scroll bar becomes visible again, the viewport shrinks in order to make room for the scroll bar.</p>

100

<p>With a scroll bar policy of <a href="qt.html#ScrollBarPolicy-enum">Qt::ScrollBarAsNeeded</a> (the default), QAbstractScrollArea shows scroll bars when those provide a non-zero scrolling range, and hides them otherwise. You control the range of each scroll bar with <a href="qabstractslider.html#setRange">QAbstractSlider::setRange</a>().</p>

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<p>In order to track scroll bar movements, reimplement the virtual function <a href="qabstractscrollarea.html#scrollContentsBy">scrollContentsBy</a>(). In order to fine-tune scrolling behavior, connect to a scroll bar's <a href="qabstractslider.html#actionTriggered">QAbstractSlider::actionTriggered</a>() signal and adjust the <a href="qabstractslider.html#sliderPosition-prop">QAbstractSlider::sliderPosition</a> as you wish.</p>

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<p>It is possible to reserve a margin area around the viewport, see <a href="qabstractscrollarea.html#setViewportMargins">setViewportMargins</a>(). The feature is mostly used to place a <a href="qheaderview.html">QHeaderView</a> widget above or beside the scrolling area.</p>

103

<p>For convience, QAbstractScrollArea makes all viewport events available in the virtual <a href="qabstractscrollarea.html#viewportEvent">viewportEvent</a>() handler. <a href="qwidget.html">QWidget</a>'s specialised handlers are remapped to viewport events in the cases where this makes sense. The remapped specialised handlers are: <a href="qabstractscrollarea.html#paintEvent">paintEvent</a>(), <a href="qabstractscrollarea.html#mousePressEvent">mousePressEvent</a>(), <a href="qabstractscrollarea.html#mouseReleaseEvent">mouseReleaseEvent</a>(), <a href="qabstractscrollarea.html#mouseDoubleClickEvent">mouseDoubleClickEvent</a>(), <a href="qabstractscrollarea.html#mouseMoveEvent">mouseMoveEvent</a>(), <a href="qabstractscrollarea.html#wheelEvent">wheelEvent</a>(), <a href="qabstractscrollarea.html#dragEnterEvent">dragEnterEvent</a>(), <a href="qabstractscrollarea.html#dragMoveEvent">dragMoveEvent</a>(), <a href="qabstractscrollarea.html#dragLeaveEvent">dragLeaveEvent</a>(), <a href="qabstractscrollarea.html#dropEvent">dropEvent</a>(), <a href="qabstractscrollarea.html#contextMenuEvent">contextMenuEvent</a>(). and <a href="qabstractscrollarea.html#resizeEvent">resizeEvent</a>().</p>

104

<hr />

105

<h2>Property Documentation</h2>

106

<h3 class="fn"><a name="horizontalScrollBarPolicy-prop"></a>horizontalScrollBarPolicy : <a href="qt.html#ScrollBarPolicy-enum">Qt::ScrollBarPolicy</a></h3>

107

<p>This property holds the policy for the horizontal scroll bar.</p>

108

<p>The default policy is <tt>Qt::ScrollBarAsNeeded</tt>.</p>

109

<p>Access functions:</p>

110

<ul>

111

<li><div class="fn"/><b>Qt::ScrollBarPolicy horizontalScrollBarPolicy () const</b></li>

112

<li><div class="fn"/><b>void setHorizontalScrollBarPolicy ( Qt::ScrollBarPolicy )</b></li>

113

</ul>

114

<p>See also <a href="qabstractscrollarea.html#verticalScrollBarPolicy-prop">verticalScrollBarPolicy</a>.</p>

115

<h3 class="fn"><a name="verticalScrollBarPolicy-prop"></a>verticalScrollBarPolicy : <a href="qt.html#ScrollBarPolicy-enum">Qt::ScrollBarPolicy</a></h3>

116

<p>This property holds the policy for the vertical scroll bar.</p>

117

<p>The default policy is <tt>Qt::ScrollBarAsNeeded</tt>.</p>

118

<p>Access functions:</p>

119

<ul>

120

<li><div class="fn"/><b>Qt::ScrollBarPolicy verticalScrollBarPolicy () const</b></li>

121

<li><div class="fn"/><b>void setVerticalScrollBarPolicy ( Qt::ScrollBarPolicy )</b></li>

122

</ul>

123

<p>See also <a href="qabstractscrollarea.html#horizontalScrollBarPolicy-prop">horizontalScrollBarPolicy</a>.</p>

124

<hr />

125

<h2>Member Function Documentation</h2>

126

<h3 class="fn"><a name="QAbstractScrollArea"></a>QAbstractScrollArea::QAbstractScrollArea ( <a href="qwidget.html">QWidget</a> * <i>parent</i> = 0 )</h3>

127

<p>Constructs a viewport.</p>

128

<p>The <i>parent</i> arguments is sent to the <a href="qwidget.html">QWidget</a> constructor.</p>

129

<h3 class="fn"><a name="dtor.QAbstractScrollArea"></a>QAbstractScrollArea::~QAbstractScrollArea ()</h3>

130

<p>Destroys the viewport.</p>

131

<h3 class="fn"><a name="contextMenuEvent"></a>void QAbstractScrollArea::contextMenuEvent ( <a href="qcontextmenuevent.html">QContextMenuEvent</a> * <i>e</i> )  <tt> [virtual protected]</tt></h3>

132

<p>This event handler can be reimplemented in a subclass to receive context menu events for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget. The event is passed in <i>e</i>.</p>

133

<p>Reimplemented from <a href="qwidget.html#contextMenuEvent">QWidget</a>.</p>

134

<p>See also <a href="qwidget.html#contextMenuEvent">QWidget::contextMenuEvent</a>().</p>

135

<h3 class="fn"><a name="dragEnterEvent"></a>void QAbstractScrollArea::dragEnterEvent ( <a href="qdragenterevent.html">QDragEnterEvent</a> * <i>event</i> )  <tt> [virtual protected]</tt></h3>

136

<p>This event handler can be reimplemented in a subclass to receive drag enter events (passed in <i>event</i>), for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget.</p>

137

<p>Reimplemented from <a href="qwidget.html#dragEnterEvent">QWidget</a>.</p>

138

<p>See also <a href="qwidget.html#dragEnterEvent">QWidget::dragEnterEvent</a>().</p>

139

<h3 class="fn"><a name="dragLeaveEvent"></a>void QAbstractScrollArea::dragLeaveEvent ( <a href="qdragleaveevent.html">QDragLeaveEvent</a> * <i>event</i> )  <tt> [virtual protected]</tt></h3>

140

<p>This event handler can be reimplemented in a subclass to receive drag leave events (passed in <i>event</i>), for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget.</p>

141

<p>Reimplemented from <a href="qwidget.html#dragLeaveEvent">QWidget</a>.</p>

142

<p>See also <a href="qwidget.html#dragLeaveEvent">QWidget::dragLeaveEvent</a>().</p>

143

<h3 class="fn"><a name="dragMoveEvent"></a>void QAbstractScrollArea::dragMoveEvent ( <a href="qdragmoveevent.html">QDragMoveEvent</a> * <i>event</i> )  <tt> [virtual protected]</tt></h3>

144

<p>This event handler can be reimplemented in a subclass to receive drag move events (passed in <i>event</i>), for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget.</p>

145

<p>Reimplemented from <a href="qwidget.html#dragMoveEvent">QWidget</a>.</p>

146

<p>See also <a href="qwidget.html#dragMoveEvent">QWidget::dragMoveEvent</a>().</p>

147

<h3 class="fn"><a name="dropEvent"></a>void QAbstractScrollArea::dropEvent ( <a href="qdropevent.html">QDropEvent</a> * <i>event</i> )  <tt> [virtual protected]</tt></h3>

148

<p>This event handler can be reimplemented in a subclass to receive drop events (passed in <i>event</i>), for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget.</p>

149

<p>Reimplemented from <a href="qwidget.html#dropEvent">QWidget</a>.</p>

150

<p>See also <a href="qwidget.html#dropEvent">QWidget::dropEvent</a>().</p>

151

<h3 class="fn"><a name="event"></a>bool QAbstractScrollArea::event ( <a href="qevent.html">QEvent</a> * <i>e</i> )  <tt> [virtual protected]</tt></h3>

152

<p>This is the main event handler for the <a href="qabstractscrollarea.html">QAbstractScrollArea</a> widget (<i>not</i> the scrolling area <a href="qabstractscrollarea.html#viewport">viewport</a>()). The event is passed in <i>e</i>.</p>

153

<p>Reimplemented from <a href="qobject.html#event">QObject</a>.</p>

154

<h3 class="fn"><a name="horizontalScrollBar"></a><a href="qscrollbar.html">QScrollBar</a> * QAbstractScrollArea::horizontalScrollBar () const</h3>

155

<p>Returns the horizontal scroll bar.</p>

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<p>See also <a href="qabstractscrollarea.html#horizontalScrollBarPolicy-prop">horizontalScrollBarPolicy</a> and <a href="qabstractscrollarea.html#verticalScrollBar">verticalScrollBar</a>().</p>

157

<h3 class="fn"><a name="keyPressEvent"></a>void QAbstractScrollArea::keyPressEvent ( <a href="qkeyevent.html">QKeyEvent</a> * <i>e</i> )  <tt> [virtual protected]</tt></h3>

158

<p>This function is called with key event <i>e</i> when key presses occur. It handles PageUp, PageDown, Up, Down, Left, and Right, and ignores all other key presses.</p>

159

<p>Reimplemented from <a href="qwidget.html#keyPressEvent">QWidget</a>.</p>

160

<h3 class="fn"><a name="maximumViewportSize"></a><a href="qsize.html">QSize</a> QAbstractScrollArea::maximumViewportSize () const</h3>

161

<p>Returns the size of the viewport as if the scroll bars had no valid scrolling range.</p>

162

<h3 class="fn"><a name="mouseDoubleClickEvent"></a>void QAbstractScrollArea::mouseDoubleClickEvent ( <a href="qmouseevent.html">QMouseEvent</a> * <i>e</i> )  <tt> [virtual protected]</tt></h3>

163

<p>This event handler can be reimplemented in a subclass to receive mouse double click events for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget. The event is passed in <i>e</i>.</p>

164

<p>Reimplemented from <a href="qwidget.html#mouseDoubleClickEvent">QWidget</a>.</p>

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<p>See also <a href="qwidget.html#mouseDoubleClickEvent">QWidget::mouseDoubleClickEvent</a>().</p>

166

<h3 class="fn"><a name="mouseMoveEvent"></a>void QAbstractScrollArea::mouseMoveEvent ( <a href="qmouseevent.html">QMouseEvent</a> * <i>e</i> )  <tt> [virtual protected]</tt></h3>

167

<p>This event handler can be reimplemented in a subclass to receive mouse move events for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget. The event is passed in <i>e</i>.</p>

168

<p>Reimplemented from <a href="qwidget.html#mouseMoveEvent">QWidget</a>.</p>

169

<p>See also <a href="qwidget.html#mouseMoveEvent">QWidget::mouseMoveEvent</a>().</p>

170

<h3 class="fn"><a name="mousePressEvent"></a>void QAbstractScrollArea::mousePressEvent ( <a href="qmouseevent.html">QMouseEvent</a> * <i>e</i> )  <tt> [virtual protected]</tt></h3>

171

<p>This event handler can be reimplemented in a subclass to receive mouse press events for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget. The event is passed in <i>e</i>.</p>

172

<p>Reimplemented from <a href="qwidget.html#mousePressEvent">QWidget</a>.</p>

173

<p>See also <a href="qwidget.html#mousePressEvent">QWidget::mousePressEvent</a>().</p>

174

<h3 class="fn"><a name="mouseReleaseEvent"></a>void QAbstractScrollArea::mouseReleaseEvent ( <a href="qmouseevent.html">QMouseEvent</a> * <i>e</i> )  <tt> [virtual protected]</tt></h3>

175

<p>This event handler can be reimplemented in a subclass to receive mouse release events for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget. The event is passed in <i>e</i>.</p>

176

<p>Reimplemented from <a href="qwidget.html#mouseReleaseEvent">QWidget</a>.</p>

177

<p>See also <a href="qwidget.html#mouseReleaseEvent">QWidget::mouseReleaseEvent</a>().</p>

178

<h3 class="fn"><a name="paintEvent"></a>void QAbstractScrollArea::paintEvent ( <a href="qpaintevent.html">QPaintEvent</a> * <i>event</i> )  <tt> [virtual protected]</tt></h3>

179

<p>This event handler can be reimplemented in a subclass to receive paint events (passed in <i>event</i>), for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget.</p>

180

<p>Note: If you open a painter, make sure to open it on the <a href="qabstractscrollarea.html#viewport">viewport</a>().</p>

181

<p>Reimplemented from <a href="qwidget.html#paintEvent">QWidget</a>.</p>

182

<p>See also <a href="qwidget.html#paintEvent">QWidget::paintEvent</a>().</p>

183

<h3 class="fn"><a name="resizeEvent"></a>void QAbstractScrollArea::resizeEvent ( <a href="qresizeevent.html">QResizeEvent</a> * <i>event</i> )  <tt> [virtual protected]</tt></h3>

184

<p>This event handler can be reimplemented in a subclass to receive resize events (passed in <i>event</i>), for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget. When resizeEvent() is called, the viewport already has its new geometry. The old size is accessible through <a href="qresizeevent.html#oldSize">QResizeEvent::oldSize</a>().</p>

185

<p>Reimplemented from <a href="qwidget.html#resizeEvent">QWidget</a>.</p>

186

<p>See also <a href="qwidget.html#resizeEvent">QWidget::resizeEvent</a>().</p>

187

<h3 class="fn"><a name="scrollContentsBy"></a>void QAbstractScrollArea::scrollContentsBy ( int <i>dx</i>, int <i>dy</i> )  <tt> [virtual protected]</tt></h3>

188

<p>Scrolls the viewport's contents by <i>dx</i>, <i>dy</i>.</p>

189

<h3 class="fn"><a name="setViewportMargins"></a>void QAbstractScrollArea::setViewportMargins ( int <i>left</i>, int <i>top</i>, int <i>right</i>, int <i>bottom</i> )  <tt> [protected]</tt></h3>

190

<p>Sets the margins around the scrolling area to <i>left</i>, <i>top</i>, <i>right</i> and <i>bottom</i>. This is useful for applications such as spreadsheets with "locked" rows and columns. The marginal space is is left blank; put widgets in the unused area.</p>

191

<p>By default all margins are zero.</p>

192

<h3 class="fn"><a name="verticalScrollBar"></a><a href="qscrollbar.html">QScrollBar</a> * QAbstractScrollArea::verticalScrollBar () const</h3>

193

<p>Returns the vertical scroll bar.</p>

194

<p>See also <a href="qabstractscrollarea.html#verticalScrollBarPolicy-prop">verticalScrollBarPolicy</a> and <a href="qabstractscrollarea.html#horizontalScrollBar">horizontalScrollBar</a>().</p>

195

<h3 class="fn"><a name="viewport"></a><a href="qwidget.html">QWidget</a> * QAbstractScrollArea::viewport () const</h3>

196

<p>Returns the viewport widget.</p>

197

<h3 class="fn"><a name="viewportEvent"></a>bool QAbstractScrollArea::viewportEvent ( <a href="qevent.html">QEvent</a> * <i>e</i> )  <tt> [virtual protected]</tt></h3>

198

<p>The main event handler for the scrolling area (the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget). It handles event <i>e</i>.</p>

199

<p>You can reimplement this function in a subclass, but we recommend using one of the specialized event handlers instead.</p>

200

<p>Specialised handlers for viewport events are: <a href="qabstractscrollarea.html#paintEvent">paintEvent</a>(), <a href="qabstractscrollarea.html#mousePressEvent">mousePressEvent</a>(), <a href="qabstractscrollarea.html#mouseReleaseEvent">mouseReleaseEvent</a>(), <a href="qabstractscrollarea.html#mouseDoubleClickEvent">mouseDoubleClickEvent</a>(), <a href="qabstractscrollarea.html#mouseMoveEvent">mouseMoveEvent</a>(), <a href="qabstractscrollarea.html#wheelEvent">wheelEvent</a>(), <a href="qabstractscrollarea.html#dragEnterEvent">dragEnterEvent</a>(), <a href="qabstractscrollarea.html#dragMoveEvent">dragMoveEvent</a>(), <a href="qabstractscrollarea.html#dragLeaveEvent">dragLeaveEvent</a>(), <a href="qabstractscrollarea.html#dropEvent">dropEvent</a>(), <a href="qabstractscrollarea.html#contextMenuEvent">contextMenuEvent</a>(), and <a href="qabstractscrollarea.html#resizeEvent">resizeEvent</a>().</p>

201

<h3 class="fn"><a name="wheelEvent"></a>void QAbstractScrollArea::wheelEvent ( <a href="qwheelevent.html">QWheelEvent</a> * <i>e</i> )  <tt> [virtual protected]</tt></h3>

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<p>This event handler can be reimplemented in a subclass to receive wheel events for the <a href="qabstractscrollarea.html#viewport">viewport</a>() widget. The event is passed in <i>e</i>.</p>

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<p>Reimplemented from <a href="qwidget.html#wheelEvent">QWidget</a>.</p>

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<p>See also <a href="qwidget.html#wheelEvent">QWidget::wheelEvent</a>().</p>

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