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

Qt 5.6.2 Reference Documentation

# dragselection.qml Example File

views/visualdatamodel/dragselection.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 QtQml.Models 2.1

      Item {
          id: root

          width: 320
          height: 480

          property bool dragging: false

          Component {
              id: packageDelegate
              Package {
                  id: packageRoot

                  MouseArea {
                      id: visibleContainer
                      Package.name: "visible"

                      width: 64
                      height: 64
                      enabled: packageRoot.DelegateModel.inSelected

                      drag.target: draggable

                      Item {
                          id: draggable

                          width: 64
                          height: 64

                          Drag.active: visibleContainer.drag.active

                          anchors { horizontalCenter: parent.horizontalCenter; verticalCenter: parent.verticalCenter }

                          states: State {
                              when: visibleContainer.drag.active
                              AnchorChanges { target:  draggable; anchors { horizontalCenter: undefined; verticalCenter: undefined} }
                              ParentChange { target: selectionView; parent: draggable; x: 0; y: 0 }
                              PropertyChanges { target: root; dragging: true }
                              ParentChange { target: draggable; parent: root }
                          }
                      }
                      DropArea {
                          anchors.fill: parent
                          onEntered: selectedItems.move(0, visualModel.items.get(packageRoot.DelegateModel.itemsIndex), selectedItems.count)
                      }
                  }
                  Item {
                      id: selectionContainer
                      Package.name: "selection"

                      width: 64
                      height: 64

                      visible: PathView.onPath
                  }
                  Rectangle {
                      id: content
                      parent: visibleContainer

                      width: 58
                      height: 58

                      radius: 8

                      gradient: Gradient {
                          GradientStop { id: gradientStart; position: 0.0; color: "#8AC953" }
                          GradientStop { id: gradientEnd; position: 1.0; color: "#8BC953" }
                      }

                      border.width: 2
                      border.color: "#007423"

                      state: root.dragging && packageRoot.DelegateModel.inSelected ? "selected" : "visible"

                      Text {
                          anchors.fill: parent
                          horizontalAlignment: Text.AlignHCenter
                          verticalAlignment: Text.AlignVCenter
                          color: "white"
                          text: modelData
                          font.pixelSize: 18
                      }

                      Rectangle {
                          anchors { right: parent.right; top: parent.top; margins: 3 }
                          width: 12; height: 12
                          color: packageRoot.DelegateModel.inSelected ? "black" : "white"
                          radius: 6

                          border.color: "white"
                          border.width: 2

                          MouseArea {
                              anchors.fill: parent
                              onClicked: packageRoot.DelegateModel.inSelected = !packageRoot.DelegateModel.inSelected
                          }
                      }

                      states: [
                          State {
                              name: "selected"
                              ParentChange { target: content; parent: selectionContainer; x: 3; y: 3 }
                              PropertyChanges { target: packageRoot; DelegateModel.inItems: visibleContainer.drag.active }
                              PropertyChanges { target: gradientStart; color: "#017423" }
                              PropertyChanges { target: gradientStart; color: "#007423" }
                          }, State {
                              name: "visible"
                              PropertyChanges { target: packageRoot; DelegateModel.inItems: true }
                              ParentChange { target: content; parent: visibleContainer; x: 3; y: 3 }
                              PropertyChanges { target: gradientStart; color: "#8AC953" }
                              PropertyChanges { target: gradientStart; color: "#8BC953" }
                          }
                      ]
                      transitions: Transition {
                          PropertyAction { target: packageRoot; properties: "DelegateModel.inItems" }
                          ParentAnimation {
                              target: content
                              NumberAnimation { target: content; properties: "x,y"; duration: 500 }
                          }
                          ColorAnimation { targets: [gradientStart, gradientEnd]; duration: 500 }
                      }
                  }
              }
          }

          DelegateModel {
              id: visualModel
              model: 35
              delegate: packageDelegate

              groups: VisualDataGroup { id: selectedItems; name: "selected" }

              Component.onCompleted:  parts.selection.filterOnGroup = "selected"
          }

          PathView {
              id: selectionView

              height: 64
              width: 64

              model: visualModel.parts.selection

              path: Path {
                  startX: 0
                  startY: 0
                  PathLine { x: 64; y: 64 }
              }
          }

          GridView {
              id: itemsView
              anchors { fill: parent }
              cellWidth: 64
              cellHeight: 64
              model: visualModel.parts.visible
          }
      }