Qt 5.7 | Qt Data Visualization | Qt Quick 2 Legend Example | LegendItem.qml Example File

Qt 5.7.1 Reference Documentation

# LegendItem.qml Example File

qmllegend/qml/qmllegend/LegendItem.qml

      /****************************************************************************
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      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the Qt Data Visualization module of the Qt Toolkit.
      **
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      import QtQuick 2.1
      import QtQuick.Layouts 1.0
      import QtQuick.Window 2.1
      import QtDataVisualization 1.0

      Rectangle {
          property Theme3D theme
          property Bar3DSeries series
          property point previousSelection

          id: legendItem
          state: "unselected"

          // Workaround for a layout bug that in some situations causes changing from fully opaque color
          // to a transparent one to use black background instead of what is actually under the items.
          // Having the control always slighthly transparent forces the background to be refreshed
          // properly.
          opacity: 0.999

          RowLayout {
              anchors.fill: parent
              spacing: 0
              clip: true
              Item {
                  id: markerSpace
                  Layout.minimumWidth: 20
                  Layout.minimumHeight: 20
                  Layout.fillWidth: true
                  Layout.fillHeight: true
                  Layout.alignment: Qt.AlignVCenter
                  Rectangle {
                      x: parent.x + parent.width / 4
                      y: parent.y + parent.height / 4
                      width: parent.width / 2
                      height: width
                      border.color: "black"
                      color: series.baseColor
                  }
              }
              Item {
                  height: markerSpace.height
                  Layout.fillWidth: true
                  Layout.fillHeight: true
                  Layout.alignment: Qt.AlignVCenter
                  Layout.minimumWidth: 100
                  Text {
                      anchors.fill: parent
                      text: series.name
                      verticalAlignment: Text.AlignVCenter
                      clip: true
                      color: theme.labelTextColor
                      font: theme.font
                  }
              }
          }

          MouseArea {
              id: mouseArea
              anchors.fill: legendItem
              onClicked: {
                  if (legendItem.state === "selected") {
                      series.selectedBar = series.invalidSelectionPosition
                  } else {
                      series.selectedBar = previousSelection
                  }
              }
          }

          Connections {
              target: series
              onSelectedBarChanged: {
                  if (position != series.invalidSelectionPosition) {
                      previousSelection = position
                  }
              }
          }

          states: [
              State  {
                  name: "selected"
                  when: series.selectedBar != series.invalidSelectionPosition
                  PropertyChanges {
                      target: legendItem
                      color: series.singleHighlightColor
                  }
              },
              State  {
                  name: "unselected"
                  when: series.selectedBar == series.invalidSelectionPosition
                  PropertyChanges {
                      target: legendItem
                      color: theme.labelBackgroundColor
                  }
              }
          ]
      }