Qt 5.6 | Qt Quick | Qt Quick Examples - Views | dynamiclist.qml Example File

Qt 5.6.3 Reference Documentation

# dynamiclist.qml Example File

views/listview/dynamiclist.qml

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/
      import QtQuick 2.0
      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: 80
                  clip: true

                  Column {
                      id: arrows
                      anchors {
                          left: parent.left
                          verticalCenter: parent.verticalCenter
                      }
                      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 {
                          left: arrows.right
                          horizontalCenter: parent.horizontalCenter;
                          bottom: parent.verticalCenter
                      }

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

                  Item {
                      anchors {
                          left: arrows.right
                          horizontalCenter: parent.horizontalCenter;
                          top: parent.verticalCenter
                          bottom: parent.bottom
                      }

                      Row {
                          anchors.centerIn: parent
                          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: 80; 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 {
                  left: parent.left; top: parent.top;
                  right: parent.right; bottom: buttons.top;
                  margins: 20
              }
              model: fruitModel
              delegate: listDelegate
          }

          Row {
              id: buttons
              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()
              }
          }
      }