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<td >Qt 5.12</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td >Qt Quick Examples - Drag and Drop</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="#tiles">Tiles</a></li>
<li class="level1"><a href="#gridview-example">GridView Example</a></li>
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<h1 class="title">Qt Quick Examples - Drag and Drop</h1>
<span class="subtitle"></span>
<!-- $$$draganddrop-brief -->
<p>This is a collection of QML drag and drop examples.</p>
<!-- @@@draganddrop -->
<!-- $$$draganddrop-description -->
<div class="descr"> <a name="details"></a>
<p class="centerAlign"><img src="images/qml-draganddrop-example.png" alt="" /></p><p><i>Drag and Drop</i> is a collection of small QML examples relating to the drag and drop functionality. For more information, visit the Drag and Drop page.</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="tiles"></a>
<h2 id="tiles">Tiles</h2>
<p><i>Tiles</i> adds drag and drop to simple rectangles, which you can drag into a specific grid.</p>
<p>It has a DragTile component which uses a <a href="qml-qtquick-mousearea.html">MouseArea</a> to move an item when dragged:</p>
<pre class="qml">
Item {
id: root
property string colorKey
width: 64; height: 64
MouseArea {
id: mouseArea
width: 64; height: 64
anchors.centerIn: parent
drag.target: tile
onReleased: parent = tile.Drag.target !== null ? tile.Drag.target : root
Rectangle {
id: tile
width: 64; height: 64
anchors.verticalCenter: parent.verticalCenter
anchors.horizontalCenter: parent.horizontalCenter
color: colorKey
Drag.keys: [ colorKey ]
Drag.active: mouseArea.drag.active
Drag.hotSpot.x: 32
Drag.hotSpot.y: 32
states: State {
when: mouseArea.drag.active
ParentChange { target: tile; parent: root }
AnchorChanges { target: tile; anchors.verticalCenter: undefined; anchors.horizontalCenter: undefined }
}
}
}
}
</pre>
<p>And a DropTile component on which the dragged tiles can be dropped:</p>
<pre class="qml">
DropArea {
id: dragTarget
property string colorKey
property alias dropProxy: dragTarget
width: 64; height: 64
keys: [ colorKey ]
Rectangle {
id: dropRectangle
anchors.fill: parent
color: colorKey
states: [
State {
when: dragTarget.containsDrag
PropertyChanges {
target: dropRectangle
color: "grey"
}
}
]
}
}
</pre>
<p>The keys property of the <a href="qml-qtquick-droparea.html">DropArea</a> will only allow an item to be dropped on it if it has a matching key in its Drag.keys property.</p>
<a name="gridview-example"></a>
<h2 id="gridview-example">GridView Example</h2>
<p>The <i><a href="qml-qtquick-gridview.html">GridView</a> Example</i> adds drag and drop to a <a href="qml-qtquick-gridview.html">GridView</a>, allowing you to visually reorder the delegates without changing the underlying ListModel. It uses a DelegateModel to move a delegate item to the position of another item it is dragged over.</p>
<pre class="qml">
model: DelegateModel {
delegate: DropArea {
id: delegateRoot
width: 80; height: 80
onEntered: visualModel.items.move(drag.source.visualIndex, icon.visualIndex)
property int visualIndex: DelegateModel.itemsIndex
Binding { target: icon; property: "visualIndex"; value: visualIndex }
Rectangle {
id: icon
property int visualIndex: 0
width: 72; height: 72
anchors {
horizontalCenter: parent.horizontalCenter;
verticalCenter: parent.verticalCenter
}
radius: 3
color: model.color
Text {
anchors.centerIn: parent
color: "white"
text: parent.visualIndex
}
DragHandler {
id: dragHandler
}
Drag.active: dragHandler.active
Drag.source: icon
Drag.hotSpot.x: 36
Drag.hotSpot.y: 36
states: [
State {
when: icon.Drag.active
ParentChange {
target: icon
parent: root
}
AnchorChanges {
target: icon
anchors.horizontalCenter: undefined
anchors.verticalCenter: undefined
}
}
]
}
}
</pre>
<p>Files:</p>
<ul>
<li><a href="qtquick-draganddrop-draganddrop-pro.html">draganddrop/draganddrop.pro</a></li>
<li><a href="qtquick-draganddrop-draganddrop-qml.html">draganddrop/draganddrop.qml</a></li>
<li><a href="qtquick-draganddrop-draganddrop-qmlproject.html">draganddrop/draganddrop.qmlproject</a></li>
<li><a href="qtquick-draganddrop-draganddrop-qrc.html">draganddrop/draganddrop.qrc</a></li>
<li><a href="qtquick-draganddrop-main-cpp.html">draganddrop/main.cpp</a></li>
<li><a href="qtquick-draganddrop-tiles-dragtile-qml.html">draganddrop/tiles/DragTile.qml</a></li>
<li><a href="qtquick-draganddrop-tiles-droptile-qml.html">draganddrop/tiles/DropTile.qml</a></li>
<li><a href="qtquick-draganddrop-tiles-tiles-qml.html">draganddrop/tiles/tiles.qml</a></li>
<li><a href="qtquick-draganddrop-views-gridview-qml.html">draganddrop/views/gridview.qml</a></li>
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<!-- @@@draganddrop -->
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