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<td >Qt 5.12</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td >Qt Quick Examples - Touch Interaction</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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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#running-the-example">Running the Example</a></li>
<li class="level1"><a href="#multipoint-flames-example">Multipoint Flames Example</a></li>
<li class="level1"><a href="#bear-whack-example">Bear-Whack Example</a></li>
<li class="level1"><a href="#flick-resize-example">Flick Resize Example</a></li>
<li class="level1"><a href="#flickable-example">Flickable Example</a></li>
<li class="level1"><a href="#corkboards-example">Corkboards Example</a></li>
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<h1 class="title">Qt Quick Examples - Touch Interaction</h1>
<span class="subtitle"></span>
<!-- $$$touchinteraction-brief -->
<p>A collection of QML Touch Interaction examples.</p>
<!-- @@@touchinteraction -->
<!-- $$$touchinteraction-description -->
<div class="descr"> <a name="details"></a>
<p class="centerAlign"><img src="images/qml-touchinteraction-example.png" alt="" /></p><p><i>Touch Interaction</i> is a collection of small QML examples relating to touch interaction methods. For more information, visit <a href="qtquick-input-topic.html">Important Concepts In Qt Quick - User Input</a>.</p>
<a name="running-the-example"></a>
<h2 id="running-the-example">Running the Example</h2>
<p>To run the example from Qt Creator, open the <b>Welcome</b> mode and select the example from <b>Examples</b>. For more information, visit Building and Running an Example.</p>
<a name="multipoint-flames-example"></a>
<h2 id="multipoint-flames-example">Multipoint Flames Example</h2>
<p><i>Multipoint Flames</i> demonstrates distinguishing different fingers in a <a href="qml-qtquick-multipointtoucharea.html">MultiPointTouchArea</a>, by assigning a different colored flame to each touch point.</p>
<p>The MultipointTouchArea sets up multiple touch points:</p>
<pre class="qml">
MultiPointTouchArea {
anchors.fill: parent
minimumTouchPoints: 1
maximumTouchPoints: 5
touchPoints: [
TouchPoint { id: touch1 },
TouchPoint { id: touch2 },
TouchPoint { id: touch11 },
TouchPoint { id: touch21 },
TouchPoint { id: touch31 }
]
}
</pre>
<p>The flames are then simply bound to the coordinates of the touch point, and whether it is currently pressed, as follows:</p>
<pre class="qml">
ParticleFlame {
color: "red"
emitterX: touch1.x
emitterY: touch1.y
emitting: touch1.pressed
}
</pre>
<a name="bear-whack-example"></a>
<h2 id="bear-whack-example">Bear-Whack Example</h2>
<p><i>Bear-Whack</i> demonstrates using <a href="qml-qtquick-multipointtoucharea.html">MultiPointTouchArea</a> to add multiple finger support to a simple game. The interaction with the game is done through a <a href="qml-qtquick-particles-spritegoal.html">SpriteGoal</a> that follows the <a href="qml-qtquick-touchpoint.html">TouchPoint</a>. The TouchPoints added to the <a href="qml-qtquick-multipointtoucharea.html">MultiPointTouchArea</a> are a component with the relevant logic embedded into it:</p>
<pre class="qml">
TouchPoint {
id: container
property ParticleSystem system
onPressedChanged: {
if (pressed) {
timer.restart();
child.enabled = true;
system.explode(x,y);
}
}
property QtObject obj: Timer {
id: timer
interval: 100
running: false
repeat: false
onTriggered: child.enabled = false
}
property Item child: SpriteGoal {
enabled: false
x: container.area.x - 16
y: container.area.y - 16
width: container.area.width + 32
height: container.area.height + 32 //+32 so it doesn't have to hit the exact center
system: container.system
parent: container.system
goalState: "falling"
}
}
</pre>
<a name="flick-resize-example"></a>
<h2 id="flick-resize-example">Flick Resize Example</h2>
<p><i>Flick Resize</i> uses a <a href="qml-qtquick-pincharea.html">PinchArea</a> to implement a <i>pinch-to-resize</i> behavior. This is easily achieved by listening to the <a href="qml-qtquick-pincharea.html">PinchArea</a> signals and responding to user input.</p>
<pre class="qml">
onPinchStarted: {
initialWidth = flick.contentWidth
initialHeight = flick.contentHeight
}
onPinchUpdated: {
// adjust content pos due to drag
flick.contentX += pinch.previousCenter.x - pinch.center.x
flick.contentY += pinch.previousCenter.y - pinch.center.y
// resize content
flick.resizeContent(initialWidth * pinch.scale, initialHeight * pinch.scale, pinch.center)
}
onPinchFinished: {
// Move its content within bounds.
flick.returnToBounds()
}
</pre>
<a name="flickable-example"></a>
<h2 id="flickable-example">Flickable Example</h2>
<p><i>Flickable</i> is a simple example demonstrating the <a href="qml-qtquick-flickable.html">Flickable</a> type.</p>
<pre class="qml">
Rectangle {
width: 320
height: 480
Flickable {
anchors.fill: parent
contentWidth: 1200
contentHeight: 1200
Rectangle {
width: 1000
height: 1000
</pre>
<a name="corkboards-example"></a>
<h2 id="corkboards-example">Corkboards Example</h2>
<p><i>Corkboards</i> shows another use for <a href="qml-qtquick-flickable.html">Flickable</a>, with QML types within the flickable object that respond to mouse and keyboard interaction. This behavior does not require special code as the Qt Quick types already cooperate with the Flickable type for accepting touch events.</p>
<p>Files:</p>
<ul>
<li><a href="qtquick-touchinteraction-flickable-basic-flickable-qml.html">touchinteraction/flickable/basic-flickable.qml</a></li>
<li><a href="qtquick-touchinteraction-flickable-content-panel-qml.html">touchinteraction/flickable/content/Panel.qml</a></li>
<li><a href="qtquick-touchinteraction-flickable-corkboards-qml.html">touchinteraction/flickable/corkboards.qml</a></li>
<li><a href="qtquick-touchinteraction-main-cpp.html">touchinteraction/main.cpp</a></li>
<li><a href="qtquick-touchinteraction-multipointtouch-bearwhack-qml.html">touchinteraction/multipointtouch/bearwhack.qml</a></li>
<li><a href="qtquick-touchinteraction-multipointtouch-content-augmentedtouchpoint-qml.html">touchinteraction/multipointtouch/content/AugmentedTouchPoint.qml</a></li>
<li><a href="qtquick-touchinteraction-multipointtouch-content-bearwhackparticlesystem-qml.html">touchinteraction/multipointtouch/content/BearWhackParticleSystem.qml</a></li>
<li><a href="qtquick-touchinteraction-multipointtouch-content-particleflame-qml.html">touchinteraction/multipointtouch/content/ParticleFlame.qml</a></li>
<li><a href="qtquick-touchinteraction-multipointtouch-multiflame-qml.html">touchinteraction/multipointtouch/multiflame.qml</a></li>
<li><a href="qtquick-touchinteraction-pincharea-flickresize-qml.html">touchinteraction/pincharea/flickresize.qml</a></li>
<li><a href="qtquick-touchinteraction-touchinteraction-pro.html">touchinteraction/touchinteraction.pro</a></li>
<li><a href="qtquick-touchinteraction-touchinteraction-qml.html">touchinteraction/touchinteraction.qml</a></li>
<li><a href="qtquick-touchinteraction-touchinteraction-qmlproject.html">touchinteraction/touchinteraction.qmlproject</a></li>
<li><a href="qtquick-touchinteraction-touchinteraction-qrc.html">touchinteraction/touchinteraction.qrc</a></li>
</ul>
<p>Images:</p>
<ul>
<li><a href="images/used-in-examples/touchinteraction/flickable/content/cork.jpg">touchinteraction/flickable/content/cork.jpg</a></li>
<li><a href="images/used-in-examples/touchinteraction/flickable/content/note-yellow.png">touchinteraction/flickable/content/note-yellow.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/flickable/content/tack.png">touchinteraction/flickable/content/tack.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/multipointtouch/content/Bear0.png">touchinteraction/multipointtouch/content/Bear0.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/multipointtouch/content/Bear1.png">touchinteraction/multipointtouch/content/Bear1.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/multipointtouch/content/Bear2.png">touchinteraction/multipointtouch/content/Bear2.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/multipointtouch/content/Bear3.png">touchinteraction/multipointtouch/content/Bear3.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/multipointtouch/content/BearB.png">touchinteraction/multipointtouch/content/BearB.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/multipointtouch/content/blur-circle.png">touchinteraction/multipointtouch/content/blur-circle.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/multipointtouch/content/blur-circle3.png">touchinteraction/multipointtouch/content/blur-circle3.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/multipointtouch/content/heart-blur.png">touchinteraction/multipointtouch/content/heart-blur.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/multipointtouch/content/title.png">touchinteraction/multipointtouch/content/title.png</a></li>
<li><a href="images/used-in-examples/touchinteraction/pincharea/qt-logo.jpg">touchinteraction/pincharea/qt-logo.jpg</a></li>
</ul>
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