Gui: Add cancel button to transform task UI dialog

Fixes #7517

src/Gui/TaskCSysDragger.cpp

@@ -67,6 +67,16 @@ TaskCSysDragger::~TaskCSysDragger()
   Gui::Application::Instance->commandManager().getCommandByName("Std_PerspectiveCamera")->setEnabled(true);
 }
 
+void TaskCSysDragger::dragStartCallback(void *, SoDragger *)
+{
+    // This is called when a manipulator is about to manipulating
+  if(firstDrag)
+    {
+       Gui::Application::Instance->activeDocument()->openCommand(QT_TRANSLATE_NOOP("Command", "Transform"));
+       firstDrag=false;
+    }
+}
+
 void TaskCSysDragger::setupGui()
 {
     auto incrementsBox = new Gui::TaskView::TaskBox(
@@ -117,6 +127,7 @@ void TaskCSysDragger::onRIncrementSlot(double freshValue)
 
 void TaskCSysDragger::open()
 {
+  dragger->addStartCallback(dragStartCallback, this);
   //we can't have user switching camera types while dragger is shown.
   Gui::Application::Instance->commandManager().getCommandByName("Std_OrthographicCamera")->setEnabled(false);
   Gui::Application::Instance->commandManager().getCommandByName("Std_PerspectiveCamera")->setEnabled(false);
@@ -141,6 +152,7 @@ bool TaskCSysDragger::accept()
   if (dObject) {
     Gui::Document* document = Gui::Application::Instance->getDocument(dObject->getDocument());
     assert(document);
+    firstDrag = true;
     document->commitCommand();
     document->resetEdit();
     document->getDocument()->recompute();
@@ -148,4 +160,18 @@ bool TaskCSysDragger::accept()
   return Gui::TaskView::TaskDialog::accept();
 }
 
+bool TaskCSysDragger::reject()
+{
+  App::DocumentObject* dObject = vpObject.getObject();
+  if (dObject) {
+    Gui::Document* document = Gui::Application::Instance->getDocument(dObject->getDocument());
+    assert(document);
+    firstDrag = true;
+    document->abortCommand();
+    document->resetEdit();
+    document->getDocument()->recompute();
+  }
+  return Gui::TaskView::TaskDialog::reject();
+}
+
 #include "moc_TaskCSysDragger.cpp"

src/Gui/TaskCSysDragger.h

@@ -20,12 +20,14 @@
  *                                                                         *
  ***************************************************************************/
 
+
 #ifndef TASKCSYSDRAGGER_H
 #define TASKCSYSDRAGGER_H
 
 #include "TaskView/TaskDialog.h"
 #include <App/DocumentObserver.h>
 
+class SoDragger;
 
 namespace Gui
 {
@@ -40,13 +42,16 @@ namespace Gui
       TaskCSysDragger(ViewProviderDocumentObject *vpObjectIn, SoFCCSysDragger *draggerIn);
       ~TaskCSysDragger() override;
       QDialogButtonBox::StandardButtons getStandardButtons() const override
-        { return QDialogButtonBox::Ok;}
+        { return QDialogButtonBox::Ok | QDialogButtonBox::Cancel;}
       void open() override;
       bool accept() override;
+      bool reject() override;
     private Q_SLOTS:
       void onTIncrementSlot(double freshValue);
       void onRIncrementSlot(double freshValue);
     private:
+      static inline bool firstDrag = true;
+      static void dragStartCallback(void * data, SoDragger * d);
       void setupGui();
       App::DocumentObjectT vpObject;
       SoFCCSysDragger *dragger;

src/Gui/ViewProviderDragger.cpp

@@ -146,7 +146,6 @@ bool ViewProviderDragger::setEdit(int ModNum)
     pcTransform->translation.connectFrom(&csysDragger->translation);
     pcTransform->rotation.connectFrom(&csysDragger->rotation);
 
-    csysDragger->addStartCallback(dragStartCallback, this);
     csysDragger->addFinishCallback(dragFinishCallback, this);
 
     // dragger node is added to viewer's editing root in setEditViewer
@@ -212,12 +211,6 @@ void ViewProviderDragger::unsetEditViewer(Gui::View3DInventorViewer* viewer)
     }
 }
 
-void ViewProviderDragger::dragStartCallback(void *, SoDragger *)
-{
-    // This is called when a manipulator is about to manipulating
-    Gui::Application::Instance->activeDocument()->openCommand(QT_TRANSLATE_NOOP("Command", "Transform"));
-}
-
 void ViewProviderDragger::dragFinishCallback(void *data, SoDragger *d)
 {
     // This is called when a manipulator has done manipulating
@@ -226,7 +219,7 @@ void ViewProviderDragger::dragFinishCallback(void *data, SoDragger *d)
     auto dragger = static_cast<SoFCCSysDragger *>(d);
     updatePlacementFromDragger(sudoThis, dragger);
 
-    Gui::Application::Instance->activeDocument()->commitCommand();
+    //Gui::Application::Instance->activeDocument()->commitCommand();
 }
 
 void ViewProviderDragger::updatePlacementFromDragger(ViewProviderDragger* sudoThis, SoFCCSysDragger* draggerIn)

src/Gui/ViewProviderDragger.h

@@ -72,9 +72,7 @@ protected:
     SoFCCSysDragger *csysDragger = nullptr;
 
 private:
-    static void dragStartCallback(void * data, SoDragger * d);
     static void dragFinishCallback(void * data, SoDragger * d);
-
     static void updatePlacementFromDragger(ViewProviderDragger *sudoThis, SoFCCSysDragger *draggerIn);
 
     bool checkLink();