Qt Reference Documentation

dynamiclist.qml Example File

declarative/modelviews/listview/dynamiclist.qml
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 import Qt 4.7
 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()
         }
     }
 }
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