Qt 5.7 | Qt Quick | Qt Quick Examples - Positioners | positioners-attachedproperties.qml Example File

Qt 5.7.1 Reference Documentation

# positioners-attachedproperties.qml Example File

positioners/positioners-attachedproperties.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 QtQuick.Controls 1.1

      Rectangle {
          id: page

          property real ratio: width / 320 < height / 440 ? width / 320 : height / 440
          property int elementSpacing: 6.3 * ratio

          width: 320
          height: 440

          Button {
            anchors.top: parent.top
            anchors.right: parent.right
            anchors.margins: 10
            text: hidingRect.visible ? "Hide" : "Show"
            onClicked: hidingRect.visible = !hidingRect.visible
          }

          // Create column with four rectangles, the fourth one is hidden
          Column {
              id: column

              anchors.top: parent.top
              anchors.left: parent.left
              anchors.leftMargin: page.width / 32
              anchors.topMargin: page.height / 48
              spacing: elementSpacing

              Rectangle {
                  id: green
                  color: "#80c342"
                  width: 100 * ratio
                  height: 100 * ratio

                  Text {
                    anchors.left: parent.right
                    anchors.leftMargin: 20
                    anchors.verticalCenter: parent.verticalCenter
                    text: "Index: " + parent.Positioner.index
                    + (parent.Positioner.isFirstItem ? " (First)" : "")
                    + (parent.Positioner.isLastItem ? " (Last)" : "")
                  }

                  // When mouse is clicked, display the values of the positioner
                  MouseArea {
                  anchors.fill: parent
                  onClicked: column.showInfo(green.Positioner)
                  }
              }

              Rectangle {
                  id: blue
                  color: "#14aaff"
                  width: 100 * ratio
                  height: 100 * ratio

                  Text {
                    anchors.left: parent.right
                    anchors.leftMargin: 20
                    anchors.verticalCenter: parent.verticalCenter
                    text: "Index: " + parent.Positioner.index
                    + (parent.Positioner.isFirstItem ? " (First)" : "")
                    + (parent.Positioner.isLastItem ? " (Last)" : "")
                  }

                  // When mouse is clicked, display the values of the positioner
                  MouseArea {
                  anchors.fill: parent
                  onClicked: column.showInfo(blue.Positioner)
                  }
              }

              Rectangle {
                  id: purple
                  color: "#6400aa"
                  width: 100 * ratio
                  height: 100 * ratio

                  Text {
                    anchors.left: parent.right
                    anchors.leftMargin: 20
                    anchors.verticalCenter: parent.verticalCenter
                    text: "Index: " + parent.Positioner.index
                    + (parent.Positioner.isFirstItem ? " (First)" : "")
                    + (parent.Positioner.isLastItem ? " (Last)" : "")
                  }

                  // When mouse is clicked, display the values of the positioner
                  MouseArea {
                  anchors.fill: parent
                  onClicked: column.showInfo(purple.Positioner)
                  }
              }

              // This rectangle is not visible, so it doesn't have a positioner value
              Rectangle {
                  id: hidingRect
                  color: "#006325"
                  width: 100 * ratio
                  height: 100 * ratio
                  visible: false

                  Text {
                      anchors.left: parent.right
                      anchors.leftMargin: 20
                      anchors.verticalCenter: parent.verticalCenter
                      text: "Index: " + parent.Positioner.index
                      + (parent.Positioner.isFirstItem ? " (First)" : "")
                      + (parent.Positioner.isLastItem ? " (Last)" : "")
                  }
              }

              // Print the index of the child item in the positioner and convenience
              // properties showing if it's the first or last item.
              function showInfo(positioner) {
                  console.log("Item Index = " + positioner.index)
                  console.log("  isFirstItem = " + positioner.isFirstItem)
                  console.log("  isLastItem = " + positioner.isLastItem)
              }
          }
      }