Gui: Add Show Placement utility

src/Gui/ViewProviderDragger.cpp

@@ -43,6 +43,7 @@
 #include "Control.h"
 #include "Document.h"
 #include "SoFCCSysDragger.h"
+#include "Inventor/SoFCPlacementIndicatorKit.h"
 #include "SoFCUnifiedSelection.h"
 #include "TaskCSysDragger.h"
 #include "View3DInventorViewer.h"
@@ -60,6 +61,14 @@ PROPERTY_SOURCE(Gui::ViewProviderDragger, Gui::ViewProviderDocumentObject)
 ViewProviderDragger::ViewProviderDragger()
 {
     ADD_PROPERTY_TYPE(TransformOrigin, ({}), nullptr, App::Prop_Hidden, nullptr);
+    ADD_PROPERTY_TYPE(ShowPlacement,
+                      (false),
+                      "Display Options",
+                      App::Prop_None,
+                      "If true, placement of object is additionally rendered.");
+
+    pcPlacement = new SoSwitch;
+    pcPlacement->whichChild = SO_SWITCH_NONE;
 };
 
 ViewProviderDragger::~ViewProviderDragger() = default;
@@ -98,6 +107,9 @@ void ViewProviderDragger::onChanged(const App::Property* property)
     if (property == &TransformOrigin) {
         updateDraggerPosition();
     }
+    else if (property == &ShowPlacement) {
+        pcPlacement->whichChild = ShowPlacement.getValue() ? SO_SWITCH_ALL : SO_SWITCH_NONE;
+    }
 
     ViewProviderDocumentObject::onChanged(property);
 }
@@ -322,6 +334,16 @@ void ViewProviderDragger::setDraggerPlacement(const Base::Placement& placement)
     csysDragger->clearIncrementCounts();
 }
 
+void ViewProviderDragger::attach(App::DocumentObject* pcObject)
+{
+    ViewProviderDocumentObject::attach(pcObject);
+
+    getAnnotation()->addChild(pcPlacement);
+
+    auto* pcAxisCrossKit = new Gui::SoFCPlacementIndicatorKit();
+    pcPlacement->addChild(pcAxisCrossKit);
+}
+
 void ViewProviderDragger::updateDraggerPosition()
 {
     if (!csysDragger) {

src/Gui/ViewProviderDragger.h

@@ -56,11 +56,17 @@ public:
     /// destructor.
     ~ViewProviderDragger() override;
 
+    /// Property controlling visibility of the placement indicator, useful for displaying origin
+    /// position of attached Document Object.
+    App::PropertyBool ShowPlacement;
+
     /// Origin used when object is transformed. It temporarily changes the origin of object.
     /// Dragger is normally placed at the transform origin, unless explicitly overridden via
     /// ViewProviderDragger#setDraggerPlacement() method.
     App::PropertyPlacement TransformOrigin;
 
+    void attach(App::DocumentObject* pcObject) override;
+
     /// Convenience method to obtain the transform origin
     Base::Placement getTransformOrigin() const { return TransformOrigin.getValue(); }
     /// Convenience method to set the transform origin
@@ -114,6 +120,7 @@ protected:
     CoinPtr<SoFCCSysDragger> csysDragger = nullptr;
     ViewProvider *forwardedViewProvider = nullptr;
 
+    CoinPtr<SoSwitch> pcPlacement;
 private:
     static void dragStartCallback(void *data, SoDragger *d);
     static void dragFinishCallback(void *data, SoDragger *d);