Qt 4.7: dynamiclist.qml Example File (declarative/modelviews/listview/dynamiclist.qml)

Qt Reference Documentation

# dynamiclist.qml Example File

declarative/modelviews/listview/dynamiclist.qml

     /****************************************************************************
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     ** This file is part of the examples of the Qt Toolkit.
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     import QtQuick 1.0
     import "content"

     // This example shows how items can be dynamically added to and removed from
     // a ListModel, and how these list modifications can be animated.

     Rectangle {
         id: container
         width: 500; height: 400
         color: "#343434"

         // The model:
         ListModel {
             id: fruitModel

             ListElement {
                 name: "Apple"; cost: 2.45
                 attributes: [
                     ListElement { description: "Core" },
                     ListElement { description: "Deciduous" }
                 ]
             }
             ListElement {
                 name: "Banana"; cost: 1.95
                 attributes: [
                     ListElement { description: "Tropical" },
                     ListElement { description: "Seedless" }
                 ]
             }
             ListElement {
                 name: "Cumquat"; cost: 3.25
                 attributes: [
                     ListElement { description: "Citrus" }
                 ]
             }
             ListElement {
                 name: "Durian"; cost: 9.95
                 attributes: [
                     ListElement { description: "Tropical" },
                     ListElement { description: "Smelly" }
                 ]
             }
         }

         // The delegate for each fruit in the model:
         Component {
             id: listDelegate

             Item {
                 id: delegateItem
                 width: listView.width; height: 55
                 clip: true

                 Row {
                     anchors.verticalCenter: parent.verticalCenter
                     spacing: 10

                     Column {
                         Image {
                             source: "content/pics/arrow-up.png"
                             MouseArea { anchors.fill: parent; onClicked: fruitModel.move(index, index-1, 1) }
                         }
                         Image { source: "content/pics/arrow-down.png"
                             MouseArea { anchors.fill: parent; onClicked: fruitModel.move(index, index+1, 1) }
                         }
                     }

                     Column {
                         anchors.verticalCenter: parent.verticalCenter

                         Text {
                             text: name
                             font.pixelSize: 15
                             color: "white"
                         }
                         Row {
                             spacing: 5
                             Repeater {
                                 model: attributes
                                 Text { text: description; color: "White" }
                             }
                         }
                     }
                 }

                 Row {
                     anchors.verticalCenter: parent.verticalCenter
                     anchors.right: parent.right
                     spacing: 10

                     PressAndHoldButton {
                         anchors.verticalCenter: parent.verticalCenter
                         source: "content/pics/plus-sign.png"
                         onClicked: fruitModel.setProperty(index, "cost", cost + 0.25)
                     }

                     Text {
                         id: costText
                         anchors.verticalCenter: parent.verticalCenter
                         text: '$' + Number(cost).toFixed(2)
                         font.pixelSize: 15
                         color: "white"
                         font.bold: true
                     }

                     PressAndHoldButton {
                         anchors.verticalCenter: parent.verticalCenter
                         source: "content/pics/minus-sign.png"
                         onClicked: fruitModel.setProperty(index, "cost", Math.max(0,cost-0.25))
                     }

                     Image {
                         source: "content/pics/list-delete.png"
                         MouseArea { anchors.fill:parent; onClicked: fruitModel.remove(index) }
                     }
                 }

                 // Animate adding and removing of items:

                 ListView.onAdd: SequentialAnimation {
                     PropertyAction { target: delegateItem; property: "height"; value: 0 }
                     NumberAnimation { target: delegateItem; property: "height"; to: 55; duration: 250; easing.type: Easing.InOutQuad }
                 }

                 ListView.onRemove: SequentialAnimation {
                     PropertyAction { target: delegateItem; property: "ListView.delayRemove"; value: true }
                     NumberAnimation { target: delegateItem; property: "height"; to: 0; duration: 250; easing.type: Easing.InOutQuad }

                     // Make sure delayRemove is set back to false so that the item can be destroyed
                     PropertyAction { target: delegateItem; property: "ListView.delayRemove"; value: false }
                 }
             }
         }

         // The view:
         ListView {
             id: listView
             anchors.fill: parent; anchors.margins: 20
             model: fruitModel
             delegate: listDelegate
         }

         Row {
             anchors { left: parent.left; bottom: parent.bottom; margins: 20 }
             spacing: 10

             TextButton {
                 text: "Add an item"
                 onClicked: {
                     fruitModel.append({
                         "name": "Pizza Margarita",
                         "cost": 5.95,
                         "attributes": [{"description": "Cheese"}, {"description": "Tomato"}]
                     })
                 }
             }

             TextButton {
                 text: "Remove all items"
                 onClicked: fruitModel.clear()
             }
         }
     }