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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import QtQuick
import QtQml.Models
Rectangle {
id: root
width: 300; height: 400
Component {
id: dragDelegate
MouseArea {
id: dragArea
property bool held: false
anchors { left: parent.left; right: parent.right }
height: content.height
enabled: visualModel.sortOrder == visualModel.lessThan.length
drag.target: held ? content : undefined
drag.axis: Drag.YAxis
onPressAndHold: held = true
onReleased: held = false
Rectangle {
id: content
anchors {
horizontalCenter: parent.horizontalCenter
verticalCenter: parent.verticalCenter
}
width: dragArea.width; height: column.implicitHeight + 4
border.width: 1
border.color: "lightsteelblue"
color: dragArea.held ? "lightsteelblue" : "white"
Behavior on color { ColorAnimation { duration: 100 } }
radius: 2
Drag.active: dragArea.held
Drag.source: dragArea
Drag.hotSpot.x: width / 2
Drag.hotSpot.y: height / 2
states: State {
when: dragArea.held
ParentChange { target: content; parent: root }
AnchorChanges {
target: content
anchors { horizontalCenter: undefined; verticalCenter: undefined }
}
}
Column {
id: column
anchors { fill: parent; margins: 2 }
Text { text: 'Name: ' + name }
Text { text: 'Type: ' + type }
Text { text: 'Age: ' + age }
Text { text: 'Size: ' + size }
}
}
DropArea {
anchors { fill: parent; margins: 10 }
onEntered: (drag)=> {
visualModel.items.move(
drag.source.DelegateModel.itemsIndex,
dragArea.DelegateModel.itemsIndex)
}
}
}
}
//![0]
DelegateModel {
id: visualModel
//![4]
property var lessThan: [
function(left, right) { return left.name < right.name },
function(left, right) { return left.type < right.type },
function(left, right) { return left.age < right.age },
function(left, right) {
if (left.size == "Small")
return true
else if (right.size == "Small")
return false
else if (left.size == "Medium")
return true
else
return false
}
]
//![4]
//![6]
property int sortOrder: orderSelector.selectedIndex
onSortOrderChanged: items.setGroups(0, items.count, "unsorted")
//![6]
//![3]
function insertPosition(lessThan, item) {
var lower = 0
var upper = items.count
while (lower < upper) {
var middle = Math.floor(lower + (upper - lower) / 2)
var result = lessThan(item.model, items.get(middle).model);
if (result) {
upper = middle
} else {
lower = middle + 1
}
}
return lower
}
function sort(lessThan) {
while (unsortedItems.count > 0) {
var item = unsortedItems.get(0)
var index = insertPosition(lessThan, item)
item.groups = "items"
items.move(item.itemsIndex, index)
}
}
//![3]
//![1]
items.includeByDefault: false
//![5]
groups: DelegateModelGroup {
id: unsortedItems
name: "unsorted"
includeByDefault: true
//![1]
onChanged: {
if (visualModel.sortOrder == visualModel.lessThan.length)
setGroups(0, count, "items")
else
visualModel.sort(visualModel.lessThan[visualModel.sortOrder])
}
//![2]
}
//![2]
//![5]
model: PetsModel {}
delegate: dragDelegate
}
//![0]
ListView {
id: view
anchors {
left: parent.left; top: parent.top; right: parent.right; bottom: orderSelector.top;
margins: 2
}
model: visualModel
spacing: 4
cacheBuffer: 50
}
ListSelector {
id: orderSelector
anchors { left: parent.left; right: parent.right; bottom: parent.bottom; margins: 2 }
label: "Sort By"
list: [ "Name", "Type", "Age", "Size", "Custom" ]
}
}
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