Qt 5.9 | Qt Quick Extras | Qt Quick Extras - Gallery | CircularGaugeView.qml Example File

Qt 5.9.9 Reference Documentation

# CircularGaugeView.qml Example File

gallery/qml/CircularGaugeView.qml

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** BSD License Usage
      ** Alternatively, 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 2.2
      import QtQuick.Controls 1.1
      import QtQuick.Extras 1.4

      ControlView {
          id: controlView
          darkBackground: customizerItem.currentStyleDark

          property color fontColor: darkBackground ? "white" : "black"

          property bool accelerating: false

          Keys.onSpacePressed: accelerating = true
          Keys.onReleased: {
              if (event.key === Qt.Key_Space) {
                  accelerating = false;
                  event.accepted = true;
              }
          }

          Button {
              id: accelerate
              text: "Accelerate"
              anchors.horizontalCenter: parent.horizontalCenter
              anchors.bottom: parent.bottom
              height: root.height * 0.125

              onPressedChanged: accelerating = pressed

              style: BlackButtonStyle {
                  background: BlackButtonBackground {
                      pressed: control.pressed
                  }
                  label: Text {
                      text: control.text
                      color: "white"
                      font.pixelSize: Math.max(textSingleton.font.pixelSize, root.toPixels(0.04))
                      font.family: openSans.name
                      horizontalAlignment: Text.AlignHCenter
                      verticalAlignment: Text.AlignVCenter
                  }
              }
          }

          control: CircularGauge {
              id: gauge
              minimumValue: customizerItem.minimumValue
              maximumValue: customizerItem.maximumValue
              width: controlBounds.width
              height: controlBounds.height

              value: accelerating ? maximumValue : 0
              style: styleMap[customizerItem.currentStylePath]

              // This stops the styles being recreated when a new one is chosen.
              property var styleMap: {
                  var styles = {};
                  for (var i = 0; i < customizerItem.allStylePaths.length; ++i) {
                      var path = customizerItem.allStylePaths[i];
                      styles[path] = Qt.createComponent(path, gauge);
                  }
                  styles;
              }

              // Called to update the style after the user has edited a property.
              Connections {
                  target: customizerItem
                  onMinimumValueAngleChanged: __style.minimumValueAngle = customizerItem.minimumValueAngle
                  onMaximumValueAngleChanged: __style.maximumValueAngle = customizerItem.maximumValueAngle
                  onLabelStepSizeChanged: __style.tickmarkStepSize = __style.labelStepSize = customizerItem.labelStepSize
              }

              Behavior on value {
                  NumberAnimation {
                      easing.type: Easing.OutCubic
                      duration: 6000
                  }
              }
          }

          customizer: Column {
              readonly property var allStylePaths: {
                  var paths = [];
                  for (var i = 0; i < stylePicker.model.count; ++i) {
                      paths.push(stylePicker.model.get(i).path);
                  }
                  paths;
              }
              property alias currentStylePath: stylePicker.currentStylePath
              property alias currentStyleDark: stylePicker.currentStyleDark
              property alias minimumValue: minimumValueSlider.value
              property alias maximumValue: maximumValueSlider.value
              property alias minimumValueAngle: minimumAngleSlider.value
              property alias maximumValueAngle: maximumAngleSlider.value
              property alias labelStepSize: labelStepSizeSlider.value

              id: circularGaugeColumn
              spacing: customizerPropertySpacing

              readonly property bool isDefaultStyle: stylePicker.model.get(stylePicker.currentIndex).name === "Default"

              Item {
                  id: stylePickerBottomSpacing
                  width: parent.width
                  height: stylePicker.height + textSingleton.implicitHeight

                  StylePicker {
                      id: stylePicker
                      currentIndex: 1

                      model: ListModel {
                          ListElement {
                              name: "Default"
                              path: "CircularGaugeDefaultStyle.qml"
                              dark: true
                          }
                          ListElement {
                              name: "Dark"
                              path: "CircularGaugeDarkStyle.qml"
                              dark: true
                          }
                          ListElement {
                              name: "Light"
                              path: "CircularGaugeLightStyle.qml"
                              dark: false
                          }
                      }
                  }
              }

              CustomizerLabel {
                  text: "Minimum angle"
              }

              CustomizerSlider {
                  id: minimumAngleSlider
                  minimumValue: -180
                  value: -145
                  maximumValue: 180
                  width: parent.width
              }

              CustomizerLabel {
                  text: "Maximum angle"
              }

              CustomizerSlider {
                  id: maximumAngleSlider
                  minimumValue: -180
                  value: 145
                  maximumValue: 180
              }

              CustomizerLabel {
                  text: "Minimum value"
              }

              CustomizerSlider {
                  id: minimumValueSlider
                  minimumValue: 0
                  value: 0
                  maximumValue: 360
                  stepSize: 1
              }

              CustomizerLabel {
                  text: "Maximum value"
              }

              CustomizerSlider {
                  id: maximumValueSlider
                  minimumValue: 0
                  value: 240
                  maximumValue: 300
                  stepSize: 1
              }

              CustomizerLabel {
                  text: "Label step size"
              }

              CustomizerSlider {
                  id: labelStepSizeSlider
                  minimumValue: 10
                  value: 20
                  maximumValue: 100
                  stepSize: 20
              }
          }
      }