Qt 5.9 | Qt Charts | Qml Custom Legend | CustomLegend.qml Example File

Qt 5.9.3 Reference Documentation

# CustomLegend.qml Example File

qmlcustomlegend/qml/qmlcustomlegend/CustomLegend.qml

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the Qt Charts module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:GPL$
      ** 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.
      **
      ** GNU General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU
      ** General Public License version 3 or (at your option) any later version
      ** approved by the KDE Free Qt Foundation. The licenses are as published by
      ** the Free Software Foundation and appearing in the file LICENSE.GPL3
      ** included in the packaging of this file. Please review the following
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      import QtQuick 2.0
      import QtCharts 2.0

      Rectangle {
          id: legend
          color: "lightgray"

          property int seriesCount: 0
          property variant seriesNames: []
          property variant seriesColors: []
          signal entered(string seriesName)
          signal exited(string seriesName)
          signal selected(string seriesName)

          function addSeries(seriesName, color) {
              var names = seriesNames;
              names[seriesCount] = seriesName;
              seriesNames = names;

              var colors = seriesColors;
              colors[seriesCount] = color;
              seriesColors = colors;

              seriesCount++;
          }

          Gradient {
              id: buttonGradient
              GradientStop { position: 0.0; color: "#F0F0F0" }
              GradientStop { position: 1.0; color: "#A0A0A0" }
          }

          Gradient {
              id: buttonGradientHovered
              GradientStop { position: 0.0; color: "#FFFFFF" }
              GradientStop { position: 1.0; color: "#B0B0B0" }
          }

          Component {
              id: legendDelegate
              Rectangle {
                  id: rect
                  property string name: seriesNames[index]
                  property color markerColor: seriesColors[index]
                  gradient: buttonGradient
                  border.color: "#A0A0A0"
                  border.width: 1
                  radius: 4

                  implicitWidth: label.implicitWidth + marker.implicitWidth + 30
                  implicitHeight: label.implicitHeight + marker.implicitHeight + 10

                  Row {
                      id: row
                      spacing: 5
                      anchors.verticalCenter: parent.verticalCenter
                      anchors.left: parent.left
                      anchors.leftMargin: 5
                      Rectangle {
                          id: marker
                          anchors.verticalCenter: parent.verticalCenter
                          color: markerColor
                          opacity: 0.3
                          radius: 4
                          width: 12
                          height: 10
                      }
                      Text {
                          id: label
                          anchors.verticalCenter: parent.verticalCenter
                          anchors.verticalCenterOffset: -1
                          text: name
                      }
                  }

                  MouseArea {
                      id: mouseArea
                      anchors.fill: parent
                      hoverEnabled: true
                      onEntered: {
                          rect.gradient = buttonGradientHovered;
                          legend.entered(label.text);
                      }
                      onExited: {
                          rect.gradient = buttonGradient;
                          legend.exited(label.text);
                          marker.opacity = 0.3;
                          marker.height = 10;
                      }
                      onClicked: {
                          legend.selected(label.text);
                          marker.opacity = 1.0;
                          marker.height = 12;
                      }
                  }
              }
          }

          Row {
              id: legendRow
              anchors.centerIn: parent
              spacing: 10

              Repeater {
                  id: legendRepeater
                  model: seriesCount
                  delegate: legendDelegate
              }
          }
      }