activate grid button and widget size

src/Vtk/vtkViewport.cpp

@@ -251,6 +251,22 @@ void Viewport::SelectPuppet(Puppet* prop)
     Render();
 }
 
+void Viewport::SetGridVisible(bool visible)
+{
+    if (m_GridActor) {
+        m_GridActor->SetVisibility(visible);
+        Render();
+    }
+}
+
+bool Viewport::GetGridVisible() const
+{
+    if (m_GridActor) {
+        return m_GridActor->GetVisibility() != 0;
+    }
+    return false;
+}
+
 void Viewport::addProp(vtkProp* prop)
 {
     if (m_Renderer) {
@@ -270,6 +286,7 @@ void Viewport::RemoveProp(vtkProp* prop)
 void Viewport::UpdateGrid()
 {
     if (!m_Renderer || !m_GridSource) return;
+    if (m_GridActor && !m_GridActor->GetVisibility()) return;
 
     vtkCamera* camera = m_Renderer->GetActiveCamera();
     if (!camera) return;