ListView Item Manual Positioning Animations QML

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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;
}
}
}
}

}