Update HUD text color based on background

Added updateHeadsUpDisplayTextColor to adjust the Heads Up Display text color for better contrast depending on the background color. The text color now updates automatically when the background color changes or when loading settings.

Author: ThomasKroes

src/ScatterplotPlugin.cpp

@@ -264,8 +264,6 @@ ScatterplotPlugin::ScatterplotPlugin(const PluginFactory* factory) :
     getLearningCenterAction().addVideos(QStringList({ "Practitioner", "Developer" }));
 
     setOverlayActionsTargetWidget(_scatterPlotWidget);
-
-    
 }
 
 ScatterplotPlugin::~ScatterplotPlugin()
@@ -376,6 +374,10 @@ void ScatterplotPlugin::init()
     connect(&_settingsAction.getColoringAction().getColorByAction(), &OptionAction::currentIndexChanged, this, &ScatterplotPlugin::updateHeadsUpDisplay);
     connect(&_settingsAction.getPlotAction().getPointPlotAction().getSizeAction(), &ScalarAction::sourceDataChanged, this, &ScatterplotPlugin::updateHeadsUpDisplay);
     connect(&_settingsAction.getPlotAction().getPointPlotAction().getOpacityAction(), &ScalarAction::sourceDataChanged, this, &ScatterplotPlugin::updateHeadsUpDisplay);
+
+    updateHeadsUpDisplayTextColor();
+
+    connect(&_settingsAction.getMiscellaneousAction().getBackgroundColorAction(), &ColorAction::colorChanged, this, &ScatterplotPlugin::updateHeadsUpDisplayTextColor);
 }
 
 void ScatterplotPlugin::loadData(const Datasets& datasets)
@@ -993,6 +995,19 @@ void ScatterplotPlugin::updateHeadsUpDisplay()
     }
 }
 
+void ScatterplotPlugin::updateHeadsUpDisplayTextColor()
+{
+    if (auto headsUpDisplayWidget = getWidget().findChild<QWidget*>("HeadsUpDisplayWidget")) {
+        if (auto headsUpDisplayWidgetTreeView = headsUpDisplayWidget->findChild<QTreeView*>("TreeView")) {
+            QPalette palette = headsUpDisplayWidgetTreeView->palette();
+
+            palette.setColor(QPalette::Text, _settingsAction.getMiscellaneousAction().getBackgroundColorAction().getColor().lightnessF() > .5f ? Qt::black : Qt::white);
+
+            headsUpDisplayWidgetTreeView->setPalette(palette);
+        }
+    }
+}
+
 void ScatterplotPlugin::fromVariantMap(const QVariantMap& variantMap)
 {
     ViewPlugin::fromVariantMap(variantMap);
@@ -1014,6 +1029,8 @@ void ScatterplotPlugin::fromVariantMap(const QVariantMap& variantMap)
 
         _scatterPlotWidget->update();
     }
+
+    updateHeadsUpDisplayTextColor();
 }
 
 QVariantMap ScatterplotPlugin::toVariantMap() const

src/ScatterplotPlugin.h

@@ -95,6 +95,7 @@ class ScatterplotPlugin : public ViewPlugin
     void updateSelection();
 
     void updateHeadsUpDisplay();
+    void updateHeadsUpDisplayTextColor();
 
 public: // Serialization