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Diffstat (limited to 'src/charts/doc/src/examples-legendmarkers.qdoc')
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diff --git a/src/charts/doc/src/examples-legendmarkers.qdoc b/src/charts/doc/src/examples-legendmarkers.qdoc new file mode 100644 index 00000000..35ae5254 --- /dev/null +++ b/src/charts/doc/src/examples-legendmarkers.qdoc @@ -0,0 +1,43 @@ +/*! + \example legendmarkers + \title LegendMarkers Example + \ingroup qtcharts_examples + + \brief The example shows how to make use of legend markers. + + In this example we create an application which uses the QLegendMarker clicked signal to show/hide the corresponding series + in a chart. The connect marker button connects a clicked signal from all markers in a legend to the handleMarkerClicked slot. + + \image examples_legendmarkers.png + + Our application has buttons for adding or removing a series in a chart and a button to connect or disconnect the legend markers clicked signal to our handler. + In the image above we have connected the markers and clicked on one of them. + + \snippet legendmarkers/mainwidget.cpp 1 + + Here we connect the markers in the legend to our handler. To avoid connecting the same marker more than once, we first disconnect it. + + \snippet legendmarkers/mainwidget.cpp 2 + + Here we disconnect all markers from our handler. + + \snippet legendmarkers/mainwidget.cpp 3 + + In our handler we first cast the sender of the event to the QLegendMarker. + + \snippet legendmarkers/mainwidget.cpp 4 + + Then we check the type of the marker. This is required if we want to access the detailed methods of the marker and cast it to the correct type. + If all we need is the pointer to QAbstractSeries, the casting isn't necessary. In case of a pie or bar series, we may need the pointer to a related QPieSlice or QBarSet. + + \snippet legendmarkers/mainwidget.cpp 5 + + We want to toggle the visibility of the series, when the marker is clicked. To do so, we get the pointer to a related series from the marker and toggle its visibility. + Since the legend marker follows the visibility of the series by default, we also set the marked back to visible. If we don't do so, the marker will be + invisible in the legend and we can't click on it anymore. + + \snippet legendmarkers/mainwidget.cpp 6 + + Instead of making the marker invisible when the series is hidden, we dim the color of the marker. Here we do it by modifying the color of the laberBrush. + +*/ |