Enable querying selection label via API

Also enable suppressing drawing the label on graph.

Selection label formatting was consequently moved from renderers
to series.

Task-number: QTRD-2896

Change-Id: Ia6a1a40298d8db0f54349de3eb27fb0b683dd302
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>

1 files changed, 3 insertions, 12 deletions

diff --git a/examples/datavisualization/qmloscilloscope/doc/src/qmloscilloscope.qdoc b/examples/datavisualization/qmloscilloscope/doc/src/qmloscilloscope.qdoc
index c574950b..93bd5c30 100644
--- a/examples/datavisualization/qmloscilloscope/doc/src/qmloscilloscope.qdoc
+++ b/examples/datavisualization/qmloscilloscope/doc/src/qmloscilloscope.qdoc
@@ -59,11 +59,6 @@
     we still need to call QSurfaceDataProxy::resetArray() after changing the data in it to prompt
     the graph to render the data.
 
-    The final method, \c selectionLabel(), is used to generate a label string we can show on the
-    QML ui. This method utilizes the axis formats to format the label:
-
-    \snippet qmloscilloscope/datasource.cpp 2
-
     To be able to access the \c DataSource methods from QML, we need to expose it. We do this by
     defining a context property in application main:
 
@@ -86,15 +81,11 @@
     One interesting detail is that we don't specify a proxy for the Surface3DSeries we attach
     to the graph. This makes the series to utilize the default QSurfaceDataProxy.
 
-    We also specify an empty string for \l{Abstract3DSeries::itemLabelFormat}{itemLabelFormat}, since we want to display
-    the selected item information in a \c Text element instead of a label above the selection pointer.
+    We also hide the item label with \l{Abstract3DSeries::itemLabelVisible}{itemLabelFormat}, since
+    we want to display the selected item information in a \c Text element instead of a floating
+    label above the selection pointer.
     This is done because the selection pointer moves around a lot as the data changes, which makes
     the regular selection label difficult to read.
-    When selection point changes, we update the label text using a helper function
-    \c updateSelectionLabel(), which calls one of the methods we defined for our \c DataSource class
-    to obtain the label:
-
-    \snippet qmloscilloscope/qml/qmloscilloscope/main.qml 1
 
     We initialize the \c DataSource cache when the graph is complete by calling a helper function
     \c generateData(), which calls the method with the same name on the \c DataSource: