sgCScene > IsUndoStackEmpty

bool sgCScene::IsUndoStackEmpty() const

Description:

Checks whether the Undo history is empty.

Arguments:

No arguments.

Returned value:

Returns false if there are any commands in the Undo history and true if the history is empty.

Example:

sgLine* line1 = sgCreateLine(0.0, 0.0, 0.0, 2.0, 3.0, 5.0);

sgLine* line2 = line1->Clone();

sgGetScene()->StartUndoGroup();

sgGetScene()->AttachObject(line1);

sgGetScene()->AttachObject(line2);

sgGetScene()->EndUndoGroup();

asset(sgGetScene()->IsUndoStackEmpty()==false);

asset(sgGetScene()->IsRedoStackEmpty()==true);

sgGetScene()->Undo();

asset(sgGetScene()->IsUndoStackEmpty()==true);

asset(sgGetScene()->IsRedoStackEmpty()==false);