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<td >Qt 5.12</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-qmlmodule.html">QML Types</a></td><td >Obsolete Members for Canvas</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtquick-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h1 class="title">Obsolete Members for Canvas</h1>
<p><b>The following members of QML type <a href="qml-qtquick-canvas.html">Canvas</a> are obsolete.</b> They are provided to keep old source code working. We strongly advise against using them in new code.</p>
<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-canvas.html#available-prop">available</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtquick-canvas.html#canvasSize-prop">canvasSize</a></b></b> : size</li>
<li class="fn"><b><b><a href="qml-qtquick-canvas.html#context-prop">context</a></b></b> : object</li>
<li class="fn"><b><b><a href="qml-qtquick-canvas.html#contextType-prop">contextType</a></b></b> : string</li>
<li class="fn"><b><b><a href="qml-qtquick-canvas.html#renderStrategy-prop">renderStrategy</a></b></b> : enumeration</li>
<li class="fn"><b><b><a href="qml-qtquick-canvas.html#renderTarget-prop">renderTarget</a></b></b> : enumeration</li>
</ul>
<h2>Property Documentation</h2>
<!-- $$$available -->
<div class="qmlitem"><div class="qmlproto">
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<tr valign="top" class="odd" id="available-prop">
<td class="tblQmlPropNode"><p>
<a name="available-prop"></a><span class="name">available</span> : <span class="type">bool</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>Indicates when Canvas is able to provide a drawing context to operate on.</p>
</div></div><!-- @@@available -->
<br/>
<!-- $$$canvasSize -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="canvasSize-prop">
<td class="tblQmlPropNode"><p>
<a name="canvasSize-prop"></a><span class="name">canvasSize</span> : <span class="type">size</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>Holds the logical canvas size that the context paints on.</p>
<p>By default, the canvas size is the same size as the current canvas item size.</p>
<p>By setting the canvasSize, tileSize and canvasWindow, the Canvas item can act as a large virtual canvas with many separately rendered tile rectangles. Only those tiles within the current canvas window are painted by the Canvas render engine.</p>
<p><b>See also </b><a href="qml-qtquick-canvas-obsolete.html#tileSize-prop">tileSize</a> and <a href="qml-qtquick-canvas-obsolete.html#canvasWindow-prop">canvasWindow</a>.</p>
</div></div><!-- @@@canvasSize -->
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<!-- $$$context -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="context-prop">
<td class="tblQmlPropNode"><p>
<a name="context-prop"></a><span class="name">context</span> : <span class="type">object</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>Holds the active drawing context.</p>
<p>If the canvas is ready and there has been a successful call to <a href="qml-qtquick-canvas.html#getContext-method">getContext()</a> or the <a href="qml-qtquick-canvas.html#contextType-prop">contextType</a> property has been set with a supported context type, this property will contain the current drawing context, otherwise null.</p>
</div></div><!-- @@@context -->
<br/>
<!-- $$$contextType -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="contextType-prop">
<td class="tblQmlPropNode"><p>
<a name="contextType-prop"></a><span class="name">contextType</span> : <span class="type">string</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The type of drawing context to use.</p>
<p>This property is set to the name of the active context type.</p>
<p>If set explicitly the canvas will attempt to create a context of the named type after becoming available.</p>
<p>The type name is the same as used in the <a href="qml-qtquick-canvas.html#getContext-method">getContext()</a> call, for the 2d canvas the value will be "2d".</p>
<p><b>See also </b><a href="qml-qtquick-canvas.html#getContext-method">getContext()</a> and <a href="qml-qtquick-canvas.html#available-prop">available</a>.</p>
</div></div><!-- @@@contextType -->
<br/>
<!-- $$$renderStrategy -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="renderStrategy-prop">
<td class="tblQmlPropNode"><p>
<a name="renderStrategy-prop"></a><span class="name">renderStrategy</span> : <span class="type">enumeration</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>Holds the current canvas rendering strategy.</p>
<ul>
<li>Canvas.Immediate - context will perform graphics commands immediately in the main UI thread.</li>
<li>Canvas.Threaded - context will defer graphics commands to a private rendering thread.</li>
<li>Canvas.Cooperative - context will defer graphics commands to the applications global render thread.</li>
</ul>
<p>This hint is supplied along with <a href="qml-qtquick-canvas.html#renderTarget-prop">renderTarget</a> to the graphics context to determine the method of rendering. A renderStrategy, <a href="qml-qtquick-canvas.html#renderTarget-prop">renderTarget</a> or a combination may not be supported by a graphics context, in which case the context will choose appropriate options and Canvas will signal the change to the properties.</p>
<p>Configuration or runtime tests may cause the QML Scene Graph to render in the GUI thread. Selecting <code>Canvas.Cooperative</code>, does not guarantee rendering will occur on a thread separate from the GUI thread.</p>
<p>The default value is <code>Canvas.Immediate</code>.</p>
<p><b>See also </b><a href="qml-qtquick-canvas.html#renderTarget-prop">renderTarget</a>.</p>
</div></div><!-- @@@renderStrategy -->
<br/>
<!-- $$$renderTarget -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="renderTarget-prop">
<td class="tblQmlPropNode"><p>
<a name="renderTarget-prop"></a><span class="name">renderTarget</span> : <span class="type">enumeration</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>Holds the current canvas render target.</p>
<ul>
<li>Canvas.Image - render to an in memory image buffer.</li>
<li>Canvas.FramebufferObject - render to an OpenGL frame buffer</li>
</ul>
<p>This hint is supplied along with <a href="qml-qtquick-canvas.html#renderStrategy-prop">renderStrategy</a> to the graphics context to determine the method of rendering. A <a href="qml-qtquick-canvas.html#renderStrategy-prop">renderStrategy</a>, renderTarget or a combination may not be supported by a graphics context, in which case the context will choose appropriate options and Canvas will signal the change to the properties.</p>
<p>The default render target is <code>Canvas.Image</code>.</p>
</div></div><!-- @@@renderTarget -->
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