Introduce object freeze (#12580)

* Introduce object freeze

* do nothing at property change

src/App/DocumentObject.cpp

@@ -213,6 +213,28 @@ void DocumentObject::touch(bool noRecompute)
         _pDoc->signalTouchedObject(*this);
 }
 
+/**
+ * @brief Set this document object freezed.
+ * A freezed document object does not recompute ever.
+ */
+void DocumentObject::freeze()
+{
+    StatusBits.set(ObjectStatus::Freeze);
+    // use the signalTouchedObject to refresh the Gui
+    if (_pDoc)
+        _pDoc->signalTouchedObject(*this);
+}
+
+/**
+ * @brief Set this document object unfreezed.
+ * A freezed document object does not recompute ever.
+ */
+void DocumentObject::unfreeze(bool noRecompute)
+{
+    StatusBits.set(ObjectStatus::Freeze, false);
+    touch(noRecompute);
+}
+
 /**
  * @brief Check whether the document object is touched or not.
  * @return true if document object is touched, false if not.
@@ -240,6 +262,9 @@ void DocumentObject::enforceRecompute()
  */
 bool DocumentObject::mustRecompute() const
 {
+    if (StatusBits.test(ObjectStatus::Freeze))
+        return false;
+
     if (StatusBits.test(ObjectStatus::Enforce))
         return true;
 
@@ -726,6 +751,9 @@ void DocumentObject::onBeforeChange(const Property* prop)
 /// get called by the container when a Property was changed
 void DocumentObject::onChanged(const Property* prop)
 {
+    if (isFreezed())
+        return;
+
     if(GetApplication().isClosingAll())
         return;
 

src/App/DocumentObject.h

@@ -67,6 +67,7 @@ enum ObjectStatus {
     PendingTransactionUpdate = 18, // mark that the object expects a call to onUndoRedoFinished() after transaction is finished.
     RecomputeExtension = 19, // mark the object to recompute its extensions
     TouchOnColorChange = 20, // inform view provider touch object on color change
+    Freeze = 21, // do not recompute ever
 };
 
 /** Return object for feature execution
@@ -177,6 +178,12 @@ public:
     bool isRestoring() const {return StatusBits.test(ObjectStatus::Restore);}
     /// returns true if this objects is currently removed from the document
     bool isRemoving() const {return StatusBits.test(ObjectStatus::Remove);}
+    /// set this document object freezed (prevent recomputation)
+    void freeze();
+    /// set this document object unfreezed (and touch it)
+    void unfreeze(bool noRecompute=false);
+    /// returns true if this objects is currently freezed
+    bool isFreezed() const {return StatusBits.test(ObjectStatus::Freeze);}
     /// return the status bits
     unsigned long getStatus() const {return StatusBits.to_ulong();}
     bool testStatus(ObjectStatus pos) const {return StatusBits.test(size_t(pos));}