Details
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Bug
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Resolution: Fixed
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P4: Low
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5.15.2, 5.15.6, 6.2.0
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37c25c6e7 (dev), 8fae0aa4a (6.5)
Description
If Listview has a delegate with height binding to ListView, it creates all the delegate instances in the start and then delete them to keep only required ones.
Please refer to the attached sample.
ListView {
id: listView
anchors.fill: parent
onHeightChanged: console.log("ListView height changed to:", height)
model: listModel
delegate: Rectangle {
width: listView.width / 2
height: listView.height
border.width: 1
radius: 10
Text {
anchors.centerIn: parent
text: name
}
Component.onCompleted: console.log("onCompleted:", ListView.view, index)
Component.onDestruction: console.log("onDestruction:", ListView.view, index)
}
}
If Model has 7 items, the output is
qml: onCompleted: QQuickListView(0x27e9478f000) 0 qml: onCompleted: QQuickListView(0x27e9478f000) 1 qml: onCompleted: QQuickListView(0x27e9478f000) 2 qml: onCompleted: QQuickListView(0x27e9478f000) 3 qml: onCompleted: QQuickListView(0x27e9478f000) 4 qml: onCompleted: QQuickListView(0x27e9478f000) 5 qml: onCompleted: QQuickListView(0x27e9478f000) 6 qml: ListView height changed to: 480 qml: onDestruction: QQuickListView(0x27e9478f000) 6 qml: onDestruction: QQuickListView(0x27e9478f000) 5 qml: onDestruction: QQuickListView(0x27e9478f000) 4 qml: onDestruction: QQuickListView(0x27e9478f000) 3 qml: onDestruction: QQuickListView(0x27e9478f000) 2
Attachments
Issue Links
- depends on
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- Closed
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- relates to
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QTBUG-104204 Meta-task for issues related to ListView filling a window
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- Reported
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| For Gerrit Dashboard: QTBUG-89568 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 416041,16 | ListView: fix delegates being created unnecessarily | dev | qt/qtdeclarative | Status: NEW | -1 | 0 |
| 472596,7 | QQuickItemView: Skip instantiating delegates if size is 0 | dev | qt/qtdeclarative | Status: MERGED | +2 | 0 |
| 473429,2 | QQuickItemView: Skip instantiating delegates if size is 0 | 6.5 | qt/qtdeclarative | Status: MERGED | +2 | 0 |