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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<h1 align=center>QCanvasView Class Reference<br><small>[ <a href="canvas.html">canvas module</a> ]</small></h1><br clear="all">
<p>
A <a href="qwidget.html">QWidget</a> which views a <a href="qcanvas.html">QCanvas</a>.
<a href="#details">More...</a>
<p>
<code>#include <<a href="qcanvas-h.html">qcanvas.h</a>></code>
<p>
Inherits <a href="qscrollview.html">QScrollView</a>.
<p><a href="qcanvasview-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class="fn"><a href="#71b77a"><b>QCanvasView</b></a>(QCanvas*viewing=0, QWidget*parent=0, constchar*name=0, WFlagsf=0)</div>
<li><div class="fn"><a href="#f185a6"><b>~QCanvasView</b></a>()</div>
<li><div class="fn">QCanvas*<a href="#51344c"><b>canvas</b></a>()const</div>
<li><div class="fn">void<a href="#9de57d"><b>setCanvas</b></a>(QCanvas*v)</div>
</ul>
<h2>Protected Members</h2>
<ul>
<li><div class="fn">virtualvoid<a href="#6184cb"><b>drawContents</b></a>(QPainter*, intcx, intcy, intcw, intch)</div>
<li><div class="fn">virtualQSize<a href="#81579f"><b>sizeHint</b></a>()const</div>
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
A <a href="qwidget.html">QWidget</a> which views a <a href="qcanvas.html">QCanvas</a>.
<p>
Displays a view of a QCanvas, with scrollbars available if
desired. There can be more than one view of a canvas.
<p>The view of a canvas is the object which the user can see and
interact with, hence any interactivity will be based on events from
a view. For example, by subclassing QCanvasView and overriding
<a href="qscrollview.html#495587">QScrollView::contentsMousePressEvent</a>(), an application can provide a
canvas where the user can interact with items on the canvas.
<p><pre> void MyCanvasView::contentsMousePressEvent(<a href="qmouseevent.html">QMouseEvent</a>* e)
{
QCanvasItemList list = canvas()->collisions(e-><a href="qmouseevent.html#ac6f25">pos</a>());
if ( !list.isEmpty() ) {
<a href="qcanvasitem.html">QCanvasItem</a>* item = list.first();
// Process the top item
...
}
}
</pre>
<p>Most of the functionality of QCanvasView is the functionality
available for all <a href="qscrollview.html">QScrollView</a> subclasses.
<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="71b77a"></a>QCanvasView::QCanvasView(<a href="qcanvas.html">QCanvas</a>*canvas=0, <a href="qwidget.html">QWidget</a>*parent=0, constchar*name=0, WFlagsf=0)</h3>
<p>Constructs a QCanvasView which views <em>canvas.</em> The
usual <a href="qwidget.html">QWidget</a> parameters may also be supplied.
<h3 class="fn"><a name="f185a6"></a>QCanvasView::~QCanvasView()</h3>
<p>Destructs the view. The associated canvas is <em>not</em> deleted.
<h3 class="fn"><a href="qcanvas.html">QCanvas</a>*<a name="51344c"></a>QCanvasView::canvas()const</h3>
<p>Returns the canvas which the view is currently viewing.
<h3 class="fn">void<a name="6184cb"></a>QCanvasView::drawContents(<a href="qpainter.html">QPainter</a>*p, intcx, intcy, intcw, intch) <code>[virtualprotected]</code></h3>
<p>Repaints the appropriate area of the <a href="qcanvas.html">QCanvas</a> which this
QCanvasView is viewing.
<p>Reimplemented from <a href="qscrollview.html#7548fb">QScrollView.</a>
<h3 class="fn">void<a name="9de57d"></a>QCanvasView::setCanvas(<a href="qcanvas.html">QCanvas</a>*canvas)</h3>
<p>Changes the <a href="qcanvas.html">QCanvas</a> which the QCanvasView is viewing to <em>canvas.</em>
<h3 class="fn"><a href="qsize.html">QSize</a><a name="81579f"></a>QCanvasView::sizeHint()const <code>[virtualprotected]</code></h3>
<p>Suggests a size sufficient to view the entire canvas.
<p>Reimplemented from <a href="qwidget.html#4511d1">QWidget.</a>
<hr><p>
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