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/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 2.15
import QtQuick.Window 2.2
import QtQuick.Controls 2.5
import Qt.labs.qmlmodels 1.0
import TestModel 0.1
Window {
id: root
visible: true
width: 640
height: 480
property int rows: 500
property int columns: 20
property real delegateHeight: 10
property real delegateWidth: 50
CheckBox {
id: reuseItemsBox
text: "Reuse items"
checked: true
}
Rectangle {
anchors.fill: parent
anchors.margins: 10
anchors.topMargin: reuseItemsBox.height + 10
color: "lightgray"
ListView {
id: listView
anchors.fill: parent
reuseItems: reuseItemsBox.checked
cacheBuffer: 0
contentWidth: columns * delegateWidth
contentHeight: rows * delegateHeight
flickableDirection: Flickable.HorizontalAndVerticalFlick
clip: true
model: TestModel {
rowCount: root.rows
}
ScrollBar.vertical: ScrollBar { policy: ScrollBar.AlwaysOn }
ScrollBar.horizontal: ScrollBar { policy: ScrollBar.AlwaysOn }
delegate: DelegateChooser {
role: "delegateType"
DelegateChoice {
roleValue: "type1"
Item {
width: listView.contentWidth
height: delegateHeight
property int reusedCount: 0
ListView.onReused: reusedCount++
Text {
id: text1
text: "Reused count:" + reusedCount
font.pixelSize: 9
}
Row {
id: choice1
width: listView.contentWidth
height: delegateHeight
anchors.left: text1.right
anchors.leftMargin: 5
property color color: Qt.rgba(0.6, 0.6, 0.8, 1)
Component.onCompleted: {
for (var i = 0; i < columns; ++i)
cellComponent.createObject(choice1, {column: i, color: color})
}
}
}
}
DelegateChoice {
roleValue: "type2"
Item {
width: listView.contentWidth
height: delegateHeight
property int reusedCount: 0
ListView.onReused: reusedCount++
Text {
id: text2
text: "Reused count:" + reusedCount
font.pixelSize: 9
}
Row {
id: choice2
width: listView.contentWidth
height: delegateHeight
anchors.left: text2.right
anchors.leftMargin: 5
property color color: Qt.rgba(0.3, 0.3, 0.8, 1)
Component.onCompleted: {
for (var i = 0; i < columns; ++i)
cellComponent.createObject(choice2, {column: i, color: color})
}
}
}
}
}
}
}
Component {
id: cellComponent
Rectangle {
height: delegateHeight
width: delegateWidth
property int column
Text {
text: "Lorem ipsum dolor sit amet"
font.pixelSize: 9
}
}
}
}
|
