View source for Drag and Drop within a GridView/ja

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この記事はいくつかのフォーラムのスレッド(下部にリンクしました)での質問と回答を受けて作成されたものです。コードや解説でのこの記事への貢献を歓迎します。

= GridView でのドラッグ&amp;amp;ドロップ =

このサンプルは iOS スタイルのドラッグ&amp;amp;ドロップ( "参考ビデオ":http://www.youtube.com/watch?v=qnXoGnUU6uI )を GridView と ListModel で作成したものです。

このサンプルは3つのファイルから構成されています。一つがモデル(WidgetModel.qml)で、一つがデリゲート(IconItem.qml)、最後が GridView (Main.qml)です。

'''WidgetModel.qml'''
<code>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}
}</code>

'''IconItem.qml'''
<code>import QtQuick 1.0

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 &amp;amp;&amp;amp; 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 }
 }
 transitions: Transition { NumberAnimation { property: "scale"; duration: 200} }
 }
 }
}</code>

'''Main.qml'''
<code>import QtQuick 1.0

Rectangle {
 width: 640; height: 480
 color: "#222222"
 GridView {
 id: grid
 interactive: false
 anchors {
 topMargin: 60; bottomMargin: 60
 leftMargin: 140; rightMargin: 140
 fill: parent
 }
 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
 onMousePositionChanged:
 if (loc.currentId [[Image:= -1 &amp;&amp; index |= -1 &amp;&amp; index ]]= –1 &amp;&amp; index != newIndex)
 icons.move(newIndex, newIndex = index, 1)
 }
 }
}</code>

'''ビデオ'''
[YouTubeID:4tt5hQYS4Fo]

関連するフォーラムのスレッド:
"iOS Style Rearrange of Icons":http://developer.qt.nokia.com/forums/viewthread/2327/