Gui: add theming abilities to interactive gizmos

src/Gui/CMakeLists.txt

@@ -1161,6 +1161,7 @@ SET(Inventor_SRCS
     Inventor/Draggers/SoRotationDraggerGeometry.h
     Inventor/Draggers/Gizmo.h
     Inventor/Draggers/GizmoHelper.h
+    Inventor/Draggers/GizmoStyleParameters.h
     SoFCColorBar.h
     SoFCColorBarNotifier.h
     SoFCColorGradient.h

src/Gui/Inventor/Draggers/Gizmo.cpp

@@ -38,8 +38,10 @@
 #include <Base/Converter.h>
 #include <Base/Parameter.h>
 #include <Base/Precision.h>
+#include "Base/ServiceProvider.h"
 #include <Base/Tools.h>
 #include <Document.h>
+#include <Gui/Inventor/Draggers/GizmoStyleParameters.h>
 #include <Gui/Inventor/So3DAnnotation.h>
 #include <Gui/Inventor/SoToggleSwitch.h>
 #include <Gui/QuantitySpinBox.h>
@@ -125,6 +127,8 @@ SoInteractionKit* LinearGizmo::initDragger()
     arrow->cylinderHeight = 3.5;
     arrow->cylinderRadius = 0.2;
 
+    updateColorTheme();
+
     return draggerContainer;
 }
 
@@ -134,6 +138,20 @@ void LinearGizmo::uninitDragger()
     draggerContainer = nullptr;
 }
 
+void LinearGizmo::updateColorTheme()
+{
+    auto* styleParameterManager = Base::provideService<Gui::StyleParameters::ParameterManager>();
+    Base::Color baseColor = styleParameterManager->resolve(StyleParameters::LinearGizmoBaseColor);
+    Base::Color activeColor = styleParameterManager->resolve(StyleParameters::LinearGizmoActiveColor);
+
+    dragger->color = baseColor.asValue<SbColor>();
+    dragger->activeColor = activeColor.asValue<SbColor>();
+
+    auto baseGeom = SO_GET_PART(dragger, "baseGeom", SoArrowBase);
+    Base::Color baseGeomColor = styleParameterManager->resolve(StyleParameters::DimensionVisualizerColor);
+    baseGeom->color = baseGeomColor.asValue<SbColor>();
+}
+
 GizmoPlacement LinearGizmo::getDraggerPlacement()
 {
     assert(draggerContainer && "Forgot to call GizmoContainer::initGizmos?");
@@ -296,6 +314,8 @@ SoInteractionKit* RotationGizmo::initDragger()
 
     setRotAngle(property->value().getValue());
 
+    updateColorTheme();
+
     return draggerContainer;
 }
 
@@ -309,6 +329,16 @@ void RotationGizmo::uninitDragger()
     translationSensor.setFunction(nullptr);
 }
 
+void RotationGizmo::updateColorTheme()
+{
+    auto* styleParameterManager = Base::provideService<Gui::StyleParameters::ParameterManager>();
+    Base::Color baseColor = styleParameterManager->resolve(StyleParameters::RotationGizmoBaseColor);
+    Base::Color activeColor = styleParameterManager->resolve(StyleParameters::RotationGizmoActiveColor);
+
+    dragger->color = baseColor.asValue<SbColor>();
+    dragger->activeColor = activeColor.asValue<SbColor>();
+}
+
 GizmoPlacement RotationGizmo::getDraggerPlacement()
 {
     assert(draggerContainer && "Forgot to call GizmoContainer::initGizmos?");
@@ -506,6 +536,8 @@ SoInteractionKit* DirectedRotationGizmo::initDragger()
     rotator->rightArrowVisible = false;
     dragger->setPart("rotator", rotator);
 
+    updateColorTheme();
+
     return ret;
 }
 
@@ -532,6 +564,8 @@ SoInteractionKit* RadialGizmo::initDragger()
 
     dragger->instantiateBaseGeometry();
 
+    updateColorTheme();
+
     return ret;
 }
 
@@ -552,6 +586,22 @@ void RadialGizmo::flipArrow()
     rotator->flipArrow();
 }
 
+void RadialGizmo::updateColorTheme()
+{
+    auto dragger = getDraggerContainer()->getDragger();
+
+    auto* styleParameterManager = Base::provideService<Gui::StyleParameters::ParameterManager>();
+    Base::Color baseColor = styleParameterManager->resolve(StyleParameters::RotationGizmoBaseColor);
+    Base::Color activeColor = styleParameterManager->resolve(StyleParameters::RotationGizmoActiveColor);
+
+    dragger->color = baseColor.asValue<SbColor>();
+    dragger->activeColor = activeColor.asValue<SbColor>();
+
+    auto baseGeom = SO_GET_PART(dragger, "baseGeom", SoRotatorBase);
+    Base::Color baseGeomColor = styleParameterManager->resolve(StyleParameters::DimensionVisualizerColor);
+    baseGeom->color = baseGeomColor.asValue<SbColor>();
+}
+
 SO_KIT_SOURCE(GizmoContainer)
 
 void GizmoContainer::initClass()

src/Gui/Inventor/Draggers/Gizmo.h

@@ -96,6 +96,8 @@ public:
     SoInteractionKit* initDragger() override;
     void uninitDragger() override;
 
+    void updateColorTheme();
+
     // Returns the position and rotation of the base of the dragger
     GizmoPlacement getDraggerPlacement() override;
     void setDraggerPlacement(const SbVec3f& pos, const SbVec3f& dir) override;
@@ -132,6 +134,8 @@ public:
     SoInteractionKit* initDragger() override;
     void uninitDragger() override;
 
+    void updateColorTheme();
+
     // Distance between the linear gizmo base and rotation gizmo
     double sepDistance = 0;
 
@@ -190,6 +194,8 @@ public:
 
     SoInteractionKit* initDragger() override;
 
+    void updateColorTheme();
+
     void setRadius(float radius);
     void flipArrow();
 

src/Gui/Inventor/Draggers/GizmoStyleParameters.h

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/****************************************************************************
+ *                                                                          *
+ *   Copyright (c) 2025 Sayantan Deb <sayantandebin[at]gmail.com>           *
+ *                                                                          *
+ *   This file is part of FreeCAD.                                          *
+ *                                                                          *
+ *   FreeCAD is free software: you can redistribute it and/or modify it     *
+ *   under the terms of the GNU Lesser General Public License as            *
+ *   published by the Free Software Foundation, either version 2.1 of the   *
+ *   License, or (at your option) any later version.                        *
+ *                                                                          *
+ *   FreeCAD is distributed in the hope that it will be useful, but         *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
+ *   Lesser General Public License for more details.                        *
+ *                                                                          *
+ *   You should have received a copy of the GNU Lesser General Public       *
+ *   License along with FreeCAD. If not, see                                *
+ *   <https://www.gnu.org/licenses/>.                                       *
+ *                                                                          *
+ ***************************************************************************/
+
+#ifndef GUI_GIZMO_STYLE_PARAMETERS_H
+#define GUI_GIZMO_STYLE_PARAMETERS_H
+
+#include <Base/Builder3D.h>
+#include <Gui/StyleParameters/ParameterManager.h>
+
+namespace Gui::StyleParameters {
+	DEFINE_STYLE_PARAMETER(LinearGizmoBaseColor, Base::Color(1.0F, 0.0F, 0.0F));
+	DEFINE_STYLE_PARAMETER(LinearGizmoActiveColor, Base::Color(1.0F, 1.0F, 0.0F));
+
+	DEFINE_STYLE_PARAMETER(RotationGizmoBaseColor, Base::Color(1.0F, 0.0F, 0.0F));
+	DEFINE_STYLE_PARAMETER(RotationGizmoActiveColor, Base::Color(1.0F, 1.0F, 0.0F));
+
+	DEFINE_STYLE_PARAMETER(DimensionVisualizerColor, Base::Color(0.214F, 0.560F, 0.930F));
+}
+
+#endif /* GUI_GIZMO_STYLE_PARAMETERS_H */

src/Gui/Inventor/Draggers/SoLinearDraggerGeometry.cpp

@@ -151,7 +151,7 @@ SoArrowBase::SoArrowBase()
 
     SO_KIT_ADD_FIELD(cylinderHeight, (1.0));
     SO_KIT_ADD_FIELD(cylinderRadius, (0.15));
-    SO_KIT_ADD_FIELD(color, (0.214, 0.560, 0.930));
+    SO_KIT_ADD_FIELD(color, (0, 0, 1));
 
     SO_KIT_INIT_INSTANCE();