286 lines
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<h1 class="title">QML Flipable Element</h1>
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<span class="subtitle"></span>
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<!-- $$$Flipable-brief -->
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<p>The Flipable item provides a surface that can be flipped. <a href="#details">More...</a></p>
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<!-- @@@Flipable -->
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<p>Inherits <a href="qml-item.html">Item</a></p>
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<p>This element was introduced in Qt 4.7.</p>
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<ul>
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<a name="properties"></a>
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<h2>Properties</h2>
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<ul>
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<li class="fn"><b><b><a href="qml-flipable.html#back-prop">back</a></b></b> : Item</li>
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<li class="fn"><b><b><a href="qml-flipable.html#front-prop">front</a></b></b> : Item</li>
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<li class="fn"><b><b><a href="qml-flipable.html#side-prop">side</a></b></b> : enumeration</li>
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</ul>
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<!-- $$$Flipable-description -->
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<a name="details"></a>
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<h2>Detailed Description</h2>
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<p>Flipable is an item that can be visibly "flipped" between its front and back sides, like a card. It is used together with <a href="qml-rotation.html">Rotation</a>, <a href="qml-state.html">State</a> and <a href="qml-transition.html">Transition</a> elements to produce a flipping effect.</p>
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<p>The <a href="qml-flipable.html#front-prop">front</a> and <a href="qml-flipable.html#back-prop">back</a> properties are used to hold the items that are shown respectively on the front and back sides of the flipable item.</p>
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<a name="example-usage"></a>
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<h2>Example Usage</h2>
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<p>The following example shows a Flipable item that flips whenever it is clicked, rotating about the y-axis.</p>
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<p>This flipable item has a <tt>flipped</tt> boolean property that is toggled whenever the <a href="qml-mousearea.html">MouseArea</a> within the flipable is clicked. When <tt>flipped</tt> is true, the item changes to the "back" state; in this state, the <tt>angle</tt> of the <a href="qml-rotation.html">Rotation</a> item is changed to 180 degrees to produce the flipping effect. When <tt>flipped</tt> is false, the item reverts to the default state, in which the <tt>angle</tt> value is 0.</p>
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<pre class="qml"> import QtQuick 1.0
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<span class="type">Flipable</span> {
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<span class="name">id</span>: <span class="name">flipable</span>
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<span class="name">width</span>: <span class="number">240</span>
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<span class="name">height</span>: <span class="number">240</span>
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property <span class="type"><a href="qml-bool.html">bool</a></span> <span class="name">flipped</span>: <span class="number">false</span>
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<span class="name">front</span>: <span class="name">Image</span> { <span class="name">source</span>: <span class="string">"front.png"</span>; <span class="name">anchors</span>.centerIn: <span class="name">parent</span> }
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<span class="name">back</span>: <span class="name">Image</span> { <span class="name">source</span>: <span class="string">"back.png"</span>; <span class="name">anchors</span>.centerIn: <span class="name">parent</span> }
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<span class="name">transform</span>: <span class="name">Rotation</span> {
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<span class="name">id</span>: <span class="name">rotation</span>
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<span class="name">origin</span>.x: <span class="name">flipable</span>.<span class="name">width</span><span class="operator">/</span><span class="number">2</span>
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<span class="name">origin</span>.y: <span class="name">flipable</span>.<span class="name">height</span><span class="operator">/</span><span class="number">2</span>
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<span class="name">axis</span>.x: <span class="number">0</span>; <span class="name">axis</span>.y: <span class="number">1</span>; <span class="name">axis</span>.z: <span class="number">0</span> <span class="comment">// set axis.y to 1 to rotate around y-axis</span>
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<span class="name">angle</span>: <span class="number">0</span> <span class="comment">// the default angle</span>
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}
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<span class="name">states</span>: <span class="name">State</span> {
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<span class="name">name</span>: <span class="string">"back"</span>
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<span class="type"><a href="qml-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">rotation</span>; <span class="name">angle</span>: <span class="number">180</span> }
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<span class="name">when</span>: <span class="name">flipable</span>.<span class="name">flipped</span>
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}
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<span class="name">transitions</span>: <span class="name">Transition</span> {
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<span class="type"><a href="qml-numberanimation.html">NumberAnimation</a></span> { <span class="name">target</span>: <span class="name">rotation</span>; <span class="name">property</span>: <span class="string">"angle"</span>; <span class="name">duration</span>: <span class="number">4000</span> }
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}
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<span class="type"><a href="qml-mousearea.html">MouseArea</a></span> {
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<span class="name">anchors</span>.fill: <span class="name">parent</span>
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<span class="name">onClicked</span>: <span class="name">flipable</span>.<span class="name">flipped</span> <span class="operator">=</span> !<span class="name">flipable</span>.<span class="name">flipped</span>
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}
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}</pre>
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<p class="centerAlign"><img src="images/flipable.gif" alt="" /></p><p>The <a href="qml-transition.html">Transition</a> creates the animation that changes the angle over four seconds. When the item changes between its "back" and default states, the <a href="qml-numberanimation.html">NumberAnimation</a> animates the angle between its old and new values.</p>
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<p>See <a href="qdeclarativestates.html">QML States</a> for details on state changes and the default state, and <a href="qdeclarativeanimation.html">QML Animation and Transitions</a> for more information on how animations work within transitions.</p>
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<p><b>See also </b><a href="declarative-ui-components-flipable.html">Flipable example</a>.</p>
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<!-- @@@Flipable -->
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<h2>Property Documentation</h2>
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<!-- $$$front -->
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<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="front-prop"></a><span class="name">front</span> : <span class="type"><a href="qml-item.html">Item</a></span></p></td></tr><tr valign="top" class="even"><td class="tblQmlPropNode"><p><a name="back-prop"></a><span class="name">back</span> : <span class="type"><a href="qml-item.html">Item</a></span></p></td></tr></table></div><div class="qmldoc"><p>The front and back sides of the flipable.</p>
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</div></div><!-- @@@front -->
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<br/>
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<!-- $$$side -->
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<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="side-prop"></a><span class="qmlreadonly">read-only</span><span class="name">side</span> : <span class="type"><a href="qml-enumeration.html">enumeration</a></span></p></td></tr></table></div><div class="qmldoc"><p>The side of the Flipable currently visible. Possible values are <tt>Flipable.Front</tt> and <tt>Flipable.Back</tt>.</p>
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</div></div><!-- @@@side -->
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