Drag and Drop within a GridView: Difference between revisions

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'''English''' | [[Drag and Drop within a GridView Japanese|日本語]] | [[Drag and Drop within a GridView Bulgarian|Български]]
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This wiki entry is created in response to a few forum threads (links at bottom) asking for this method. Feel free to contribute to this article with explanations or code.
[[Category:Snippets::QML]]
[[Category:Developing_with_Qt::Qt Quick::QML]]
[[Category:Developing_with_Qt::Qt Quick::Tutorial]]


=Drag and Drop within a GridView=
This wiki entry is created in response to a few forum threads (links at bottom) asking for this method.
Feel free to contribute to this article with explanations or code.


This example will demonstrate the iOS style ([http://www.youtube.com/watch?v=qnXoGnUU6uI video here] ''[youtube.com]'' ) of dragging and dropping ListModel elements within a GridView.
= Drag and Drop within a GridView =
 
This example will demonstrate the iOS style ([http://www.youtube.com/watch?v=qnXoGnUU6uI video here] ) of dragging and dropping ListModel elements within a GridView.


There are three files in this example. One for the model (WidgetModel.qml), one for the delegate (IconItem.qml) and one for the GridView (Main.qml).
There are three files in this example. One for the model (WidgetModel.qml), one for the delegate (IconItem.qml) and one for the GridView (Main.qml).


'''WidgetModel.qml'''<br />
'''WidgetModel.qml'''
<syntaxhighlight lang="qml">
import QtQuick 1.0
ListModel {
ListElement { icon: "Images/widget1.png"; gridId: 0}
ListElement { icon: "Images/widget2.png"; gridId: 1}
ListElement { icon: "Images/widget3.png"; gridId: 2}
ListElement { icon: "Images/widget4.png"; gridId: 3}
ListElement { icon: "Images/widget5.png"; gridId: 4}
ListElement { icon: "Images/widget6.png"; gridId: 5}
ListElement { icon: "Images/widget7.png"; gridId: 6}
ListElement { icon: "Images/widget8.png"; gridId: 7}
ListElement { icon: "Images/widget9.png"; gridId: 8}
}
</syntaxhighlight>
 
'''IconItem.qml'''
<syntaxhighlight lang="qml">
import QtQuick 2.0
 
Component {
    Item {
    id: main
    width: grid.cellWidth; height: grid.cellHeight
 
    Image {
        id: item; parent: loc
        x: main.x + 5; y: main.y + 5
        width: main.width - 10; height: main.height - 10;
        fillMode: Image.PreserveAspectFit; smooth: true
        source: icon
 
        Rectangle {
            anchors.fill: parent;
            border.color: "#326487"; border.width: 6
            color: "transparent"; radius: 5
            visible: item.state = "active"
        }
 
        Behavior on x {
            enabled: item.state != "active"
            NumberAnimation { duration: 400; easing.type: Easing.OutBack }
        }
 
        Behavior on y {
            enabled: item.state != "active"
            NumberAnimation { duration: 400; easing.type: Easing.OutBack }
        }
 
        SequentialAnimation on rotation {
            NumberAnimation { to:  2; duration: 60 }
            NumberAnimation { to: -2; duration: 120 }
            NumberAnimation { to:  0; duration: 60 }
            running: loc.currentId !== -1 && item.state !== "active"
            loops: Animation.Infinite; alwaysRunToEnd: true
        }
 
        states: State {
            name: "active"; when: loc.currentId === gridId
            PropertyChanges { target: item; x: loc.mouseX - width/2; y: loc.mouseY - height/2; scale: 0.5; z: 10 }
        }
 
        transitions: Transition { NumberAnimation { property: "scale"; duration: 200} }
        } //Image
    } //Item
} //Component
</syntaxhighlight>
 
'''Main.qml'''
<syntaxhighlight lang="qml">
import QtQuick 2.0
import QtQuick.Controls 2.2
 
ApplicationWindow {
    width: 640; height: 480
    color: "#222222"
    visible: true


'''IconItem.qml'''<br />
    GridView {
        id: grid
        interactive: false
        anchors.fill: parent
        topMargin: 60
        bottomMargin: 60
        leftMargin: 140
        rightMargin: 140


'''Main.qml'''<br />
        cellWidth: 120
        cellHeight: 120
        model: WidgetModel { id: icons }
        delegate: IconItem { }
    }


'''Video'''<br />
    MouseArea {
        property int currentId: -1 // Original position in model
        property int newIndex // Current Position in model
        property int index: grid.indexAt(mouseX, mouseY) // Item underneath cursor


Relevant forum threads:<br />[http://developer.qt.nokia.com/forums/viewthread/2327/ iOS Style Rearrange of Icons] ''[developer.qt.nokia.com]''<br />[http://developer.qt.nokia.com/forums/viewthread/2426/ <span class="caps">QML</span> and Drag and Drop] ''[developer.qt.nokia.com]''
        id: loc
        anchors.fill: parent
        onPressAndHold: currentId = icons.get(newIndex = index).gridId
        onReleased: currentId = -1
        onPositionChanged: {
            if (loc !== currentId && index !== -1 && index !== newIndex)
                icons.move(newIndex, newIndex = index, 1)
        }
    }
}
</syntaxhighlight>


===Categories:===


* [[:Category:Developing with Qt|Developing_with_Qt]]
'''[https://www.youtube.com/watch?v=4tt5hQYS4Fo Video]'''
** [[:Category:Developing with Qt::Qt-Quick|Qt Quick]]
* [[:Category:Developing with Qt::Qt-Quick::QML|QML]]


* [[:Category:Developing with Qt::Qt-Quick::Tutorial|Tutorial]]


* [[:Category:snippets|snippets]]
Relevant forum threads:<br>
[http://forum.qt.io/topic/2279/solved-ios-style-rearrange-of-icons iOS Style Rearrange of Icons]

Latest revision as of 21:52, 12 April 2023

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This wiki entry is created in response to a few forum threads (links at bottom) asking for this method. Feel free to contribute to this article with explanations or code.

Drag and Drop within a GridView

This example will demonstrate the iOS style (video here ) of dragging and dropping ListModel elements within a GridView.

There are three files in this example. One for the model (WidgetModel.qml), one for the delegate (IconItem.qml) and one for the GridView (Main.qml).

WidgetModel.qml

import QtQuick 1.0
ListModel {
ListElement { icon: "Images/widget1.png"; gridId: 0}
ListElement { icon: "Images/widget2.png"; gridId: 1}
ListElement { icon: "Images/widget3.png"; gridId: 2}
ListElement { icon: "Images/widget4.png"; gridId: 3}
ListElement { icon: "Images/widget5.png"; gridId: 4}
ListElement { icon: "Images/widget6.png"; gridId: 5}
ListElement { icon: "Images/widget7.png"; gridId: 6}
ListElement { icon: "Images/widget8.png"; gridId: 7}
ListElement { icon: "Images/widget9.png"; gridId: 8}
}

IconItem.qml

import QtQuick 2.0

Component {
    Item {
    id: main
    width: grid.cellWidth; height: grid.cellHeight

    Image {
        id: item; parent: loc
        x: main.x + 5; y: main.y + 5
        width: main.width - 10; height: main.height - 10;
        fillMode: Image.PreserveAspectFit; smooth: true
        source: icon

        Rectangle {
            anchors.fill: parent;
            border.color: "#326487"; border.width: 6
            color: "transparent"; radius: 5
            visible: item.state = "active"
        }

        Behavior on x {
            enabled: item.state != "active"
            NumberAnimation { duration: 400; easing.type: Easing.OutBack }
        }

        Behavior on y {
            enabled: item.state != "active"
            NumberAnimation { duration: 400; easing.type: Easing.OutBack }
        }

        SequentialAnimation on rotation {
            NumberAnimation { to:  2; duration: 60 }
            NumberAnimation { to: -2; duration: 120 }
            NumberAnimation { to:  0; duration: 60 }
            running: loc.currentId !== -1 && item.state !== "active"
            loops: Animation.Infinite; alwaysRunToEnd: true
        }

        states: State {
            name: "active"; when: loc.currentId === gridId
            PropertyChanges { target: item; x: loc.mouseX - width/2; y: loc.mouseY - height/2; scale: 0.5; z: 10 }
        }

        transitions: Transition { NumberAnimation { property: "scale"; duration: 200} }
        } //Image
    } //Item
} //Component

Main.qml

import QtQuick 2.0
import QtQuick.Controls 2.2

ApplicationWindow {
    width: 640; height: 480
    color: "#222222"
    visible: true

    GridView {
        id: grid
        interactive: false
        anchors.fill: parent
        topMargin: 60
        bottomMargin: 60
        leftMargin: 140
        rightMargin: 140

        cellWidth: 120
        cellHeight: 120
        model: WidgetModel { id: icons }
        delegate: IconItem { }
    }

    MouseArea {
        property int currentId: -1 // Original position in model
        property int newIndex // Current Position in model
        property int index: grid.indexAt(mouseX, mouseY) // Item underneath cursor

        id: loc
        anchors.fill: parent
        onPressAndHold: currentId = icons.get(newIndex = index).gridId
        onReleased: currentId = -1
        onPositionChanged: {
            if (loc !== currentId && index !== -1 && index !== newIndex)
                icons.move(newIndex, newIndex = index, 1)
        }
    }
}


Video


Relevant forum threads:
iOS Style Rearrange of Icons