/// Performs an document-change undo.
void TextUndoStack::undoDocumentChange()
{
// first make sure ALL controller-changes are back to the document change-level
QMap<TextEditorController*, int>::iterator itr;
for( itr = controllerIndexMap_.begin(); itr != controllerIndexMap_.end(); ++itr) {
TextEditorController* controller = itr.key();
while( undoControllerChange(controller) ) {}; // undo all controller operations
}
// next perform an undo of the document operations
Change* change = findUndoChange();
if( change ) {
Q_ASSERT( change->controllerContext() == 0 );
change->revert( documentRef_ );
// next move the pointers to first 'related' change
for( itr = controllerIndexMap_.begin(); itr != controllerIndexMap_.end(); ++itr) {
TextEditorController* controller = itr.key();
controllerIndexMap_[controller] = findUndoIndex( changeIndex_-1, controller ) + 1; // +1 because the pointer points AFTER the found index
}
// and finally move the document pointer
setChangeIndex( findUndoIndex( changeIndex_-1 ) + 1 ); // +1 because the pointer points AFTER the found index
emit undoExecuted( change);
}
}
/// This method undos the given controller change. This method does NOT undo document changes
/// @param controller the controller to undo the change form
/// @return true if a change has been undone.
bool TextUndoStack::undoControllerChange(TextEditorController* controller)
{
Q_ASSERT(controller);
int changeIdx = controllerIndexMap_.value(controller)-1; // -1, because the index is directly AFTER the item
Change* changeToUndo = findUndoChange( controller );
if( changeToUndo && changeToUndo->controllerContext() ) {
Q_ASSERT( changeToUndo->controllerContext() == controller );
changeToUndo->revert( documentRef_ );
controllerIndexMap_[controller] = findUndoIndex( changeIdx, controller )+1;
emit undoExecuted( changeToUndo );
return true;
}
return false;
}