CustomLegend.qml Example File

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  ** Contact: https://www.qt.io/licensing/
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  ** This file is part of the Qt Charts module of the Qt Toolkit.
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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
          }
      }
  }