ListView Item Manual Positioning Animations QML: Difference between revisions

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[[Category:Snippets]]<br />[[Category:HowTo]]<br />[[Category:Developing_with_Qt::Qt Quick]]<br />[[Category:Developing_with_Qt::Qt Quick::QML]]
[[Category:Snippets]]
[[Category:HowTo]]
[[Category:Developing_with_Qt::Qt Quick]]
[[Category:Developing_with_Qt::Qt Quick::QML]]


[toc align_right=&quot;yes&amp;quot; depth=&quot;4&amp;quot;]
[toc align_right="yes" depth="4"]


'''English''' | [[ListView_Item_Manual_Positioning_Animations_QML_Bulgarian|Български]]
'''English''' | [[ListView_Item_Manual_Positioning_Animations_QML_Bulgarian|Български]]
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== QML Code ==
== QML Code ==


<code><br />import QtQuick 1.0
<code>
import QtQuick 1.0


Item {<br /> width: 600<br /> height: 600<br /> property int itemWidth: 50
Item {
width: 600
height: 600
property int itemWidth: 50


ListView {<br /> id: view<br /> model: new Array(1,2,3,4,5,6,7,8)<br /> delegate: item<br /> anchors {<br /> top: parent.top;<br /> topMargin: 10;<br /> horizontalCenter:<br /> parent.horizontalCenter;<br /> bottom:<br /> parent.bottom;<br /> }<br /> width: model.length * itemWidth + (model.length - 1) * spacing<br /> spacing: 2<br /> orientation: Qt.Horizontal<br /> snapMode: ListView.SnapOneItem<br /> highlightRangeMode: ListView.ApplyRange<br /> interactive: false<br /> Component.onCompleted: currentIndex = <s>1;<br /> }
ListView {
id: view
model: new Array(1,2,3,4,5,6,7,8)
delegate: item
anchors {
top: parent.top;
topMargin: 10;
horizontalCenter:
parent.horizontalCenter;
bottom:
parent.bottom;
}
width: model.length * itemWidth + (model.length - 1) * spacing
spacing: 2
orientation: Qt.Horizontal
snapMode: ListView.SnapOneItem
highlightRangeMode: ListView.ApplyRange
interactive: false
Component.onCompleted: currentIndex = -1;
}


<br /> Component {<br /> id: item
<br /> Rectangle {<br /> width: itemWidth<br /> height: 50<br /> color: &quot;red&amp;quot;<br /> x: {<br /> if (ListView.isCurrentItem) {<br /> if (view.flickingHorizontally) {<br /> (view.width/2)</s> (width/2)<br /> } else {<br /> (view.width/2)-(width/2)<br /> }<br /> } else {<br /> if ( view.currentIndex==<s>1) {<br /> index * (width + view.spacing)<br /> } else {<br /> if ( index &lt; view.currentIndex) {<br /> index * (width + view.spacing) + (width/2)<br /> } else {<br /> index * (width + view.spacing)</s> (width/2)<br /> }<br /> }<br /> }<br /> }<br /> y: ListView.isCurrentItem ? 200 : 0<br /> Behavior on x { SpringAnimation { spring: 4; damping: 0.4 } }<br /> Behavior on y { SpringAnimation { spring: 4; damping: 0.4 } }


Text {<br /> text: model.index<br /> }
Component {
id: item


MouseArea {<br /> anchors.fill: parent<br /> onClicked: {<br /> if (!ListView.isCurrentItem)<br /> view.currentIndex = index;<br /> else<br /> view.currentIndex = –1;<br /> }<br /> }<br /> }<br /> }<br />}<br /></code>
Rectangle {
width: itemWidth
height: 50
color: "red"
x: {
if (ListView.isCurrentItem) {
if (view.flickingHorizontally) {
(view.width/2)- (width/2)
} else {
(view.width/2)-(width/2)
}
} else {
if ( view.currentIndex==-1) {
index * (width + view.spacing)
} else {
if ( index < view.currentIndex) {
index * (width + view.spacing) + (width/2)
} else {
index * (width + view.spacing)- (width/2)
}
}
}
}
y: ListView.isCurrentItem ? 200 : 0
Behavior on x { SpringAnimation { spring: 4; damping: 0.4 } }
Behavior on y { SpringAnimation { spring: 4; damping: 0.4 } }
 
Text {
text: model.index
}
 
MouseArea {
anchors.fill: parent
onClicked: {
if (!ListView.isCurrentItem)
view.currentIndex = index;
else
view.currentIndex = –1;
}
}
}
}
}
</code>


== Results ==
== Results ==

Revision as of 10:27, 25 February 2015


[toc align_right="yes" depth="4"]

English | Български

Manual ListView Item Positioning

Introduction

Let's say for instance instead of wanting a plain ListView with its items laid out horizontally and linearly, you instead want a list to respond so that when one item is selected, that item animates towards a different position (lower y value). This item is singled out and when a different item is selected, they swap places. This was useful for my case of KDE's login manager theme, where the items were user face images.

Implementation

Here we create a ListView, a simple array just as filler for what your model will actually be, a delegate with an image and text item, and then we manually set the y and x position of them.

QML Code

import QtQuick 1.0

Item {
 width: 600
 height: 600
 property int itemWidth: 50

ListView {
 id: view
 model: new Array(1,2,3,4,5,6,7,8)
 delegate: item
 anchors {
 top: parent.top;
 topMargin: 10;
 horizontalCenter:
 parent.horizontalCenter;
 bottom:
 parent.bottom;
 }
 width: model.length * itemWidth + (model.length - 1) * spacing
 spacing: 2
 orientation: Qt.Horizontal
 snapMode: ListView.SnapOneItem
 highlightRangeMode: ListView.ApplyRange
 interactive: false
 Component.onCompleted: currentIndex = -1;
 }


 Component {
 id: item

 Rectangle {
 width: itemWidth
 height: 50
 color: "red"
 x: {
 if (ListView.isCurrentItem) {
 if (view.flickingHorizontally) {
 (view.width/2)- (width/2)
 } else {
 (view.width/2)-(width/2)
 }
 } else {
 if ( view.currentIndex==-1) {
 index * (width + view.spacing)
 } else {
 if ( index < view.currentIndex) {
 index * (width + view.spacing) + (width/2)
 } else {
 index * (width + view.spacing)- (width/2)
 }
 }
 }
 }
 y: ListView.isCurrentItem ? 200 : 0
 Behavior on x { SpringAnimation { spring: 4; damping: 0.4 } }
 Behavior on y { SpringAnimation { spring: 4; damping: 0.4 } }

Text {
 text: model.index
 }

MouseArea {
 anchors.fill: parent
 onClicked: {
 if (!ListView.isCurrentItem)
 view.currentIndex = index;
 else
 view.currentIndex = 1;
 }
 }
 }
 }
}

Results

https://lh4.googleusercontent.com/-DOTQe7zsIBg/Tj3MjY6plMI/AAAAAAAAAUw/3uAoYO33h3E/s800/qml list animation example.png

Possible Issues