fix of #917

src/Gui/TaskView/TaskWatcher.cpp

@@ -143,5 +143,30 @@ bool TaskWatcherCommandsEmptyDoc::shouldShow()
     return doc && doc->countObjects() == 0;
 }
 
+//**************************************************************************
+//**************************************************************************
+// TaskWatcherCommandsEmptySelection
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+TaskWatcherCommandsEmptySelection::TaskWatcherCommandsEmptySelection(const char* commands[],
+                                                         const char* name,
+                                                         const char* pixmap )
+    : TaskWatcherCommands(0,commands,name,pixmap)
+{
+}
+
+TaskWatcherCommandsEmptySelection::~TaskWatcherCommandsEmptySelection()
+{
+}
+
+//==== implementer ===========================================================================
+
+
+//==== calls from the TaskView ===============================================================
+
+bool TaskWatcherCommandsEmptySelection::shouldShow()
+{
+    return (App::GetApplication().getActiveDocument() && Gui::Selection().size() == 0);
+}
 
 #include "moc_TaskWatcher.cpp"

src/Gui/TaskView/TaskWatcher.h

@@ -97,6 +97,23 @@ public:
 
 };
 
+// --------------------------------------------------------------------------
+
+/// Special watcher class for showing commands when there is nothing selected
+class GuiExport TaskWatcherCommandsEmptySelection : public TaskWatcherCommands
+{
+    Q_OBJECT
+
+public:
+    TaskWatcherCommandsEmptySelection(const char* commands[], const char* name, const char* pixmap);
+    ~TaskWatcherCommandsEmptySelection();
+
+public:
+    /// is called wenn the document or the Selection changes. 
+    virtual bool shouldShow(void);
+
+};
+
 
 
 } //namespace TaskView

src/Mod/PartDesign/Gui/Workbench.cpp

@@ -140,7 +140,7 @@ void Workbench::activated()
         "Part_Box",
         "Part_Cylinder",
         0};
-   Watcher.push_back(new Gui::TaskView::TaskWatcherCommandsEmptyDoc(
+   Watcher.push_back(new Gui::TaskView::TaskWatcherCommandsEmptySelection(
          Empty,
         "Create Geometry",
         "Part_Box"