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// Copyright (C) 2016 Canonical Limited and/or its subsidiary(-ies).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
import QtQuick 2.3
ListView {
id: list
width: 400
height: 600
model: ListModel {
ListElement { kind: "Bought" }
ListElement { kind: "Available To Buy" }
}
delegate: ListView {
id: innerList
objectName: "innerList"
height: count * lineHeight
width: list.width
interactive: false
property int count: 50
model: count
property int createdItems: 0
property int destroyedItems: 0
property int lineHeight: 85
delegate: Item {
objectName: "delegate"
width: innerList.width
height: innerList.lineHeight
Rectangle {
width: parent.width - 20
height: parent.height - 20
anchors.centerIn: parent
color: Math.random() * 2 > 1 ? "green" : "yellow";
Text {
text: index
}
Component.onCompleted: createdItems++
Component.onDestruction: destroyedItems++
}
}
displayMarginBeginning: 0
displayMarginEnd: -height
function updatedDelegateCreationRange() {
if (list.contentY + list.height <= innerList.y) {
// Not visible
innerList.displayMarginBeginning = 0
innerList.displayMarginEnd = -innerList.height
} else if (innerList.y + innerList.height <= list.contentY) {
// Not visible
innerList.displayMarginBeginning = -innerList.height
innerList.displayMarginEnd = 0
} else {
innerList.displayMarginBeginning = -Math.max(list.contentY - innerList.y, 0)
innerList.displayMarginEnd = -Math.max(innerList.height - list.height - list.contentY + innerList.y, 0)
}
}
Component.onCompleted: updatedDelegateCreationRange();
onHeightChanged: updatedDelegateCreationRange();
Connections {
target: list
function onContentYChanged() { updatedDelegateCreationRange(); }
function onHeightChanged() { updatedDelegateCreationRange(); }
}
}
section.property: "kind"
section.delegate: Text {
height: 40
font.pixelSize: 30
text: section
}
}
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