CustomLegend.qml Example File

qmlcustomlegend/qml/qmlcustomlegend/CustomLegend.qml
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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.
 **
 ** $QT_BEGIN_LICENSE:GPL$
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 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
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 ** the Free Software Foundation and appearing in the file LICENSE.GPL3
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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
         }
     }
 }