void KUndo2QStack::purgeRedoState()
{
bool macro = !m_macro_stack.isEmpty();
if (macro) return;
bool redoStateChanged = false;
bool cleanStateChanged = false;
while (m_index < m_command_list.size()) {
delete m_command_list.takeLast();
redoStateChanged = true;
}
if (m_clean_index > m_index) {
m_clean_index = -1; // we've deleted the clean state
cleanStateChanged = true;
}
if (redoStateChanged) {
emit canRedoChanged(canRedo());
emit redoTextChanged(redoText());
}
if (cleanStateChanged) {
emit cleanChanged(isClean());
}
}
void QUndoStack::clear()
{
Q_D(QUndoStack);
if (d->command_list.isEmpty())
return;
bool was_clean = isClean();
d->macro_stack.clear();
qDeleteAll(d->command_list);
d->command_list.clear();
d->index = 0;
d->clean_index = 0;
emit indexChanged(0);
emit canUndoChanged(false);
emit undoTextChanged(QString());
emit canRedoChanged(false);
emit redoTextChanged(QString());
if (!was_clean)
emit cleanChanged(true);
}
void UndoStack::setClean() noexcept
{
if (isClean())
return;
mCleanIndex = mCurrentIndex;
emit cleanChanged(true);
}
void UndoStack::redo() throw (Exception)
{
if (!canRedo())
return;
mCommands[mCurrentIndex]->redo(); // throws an exception on error
mCurrentIndex++;
// emit signals
emit undoTextChanged(getUndoText());
emit redoTextChanged(getRedoText());
emit canUndoChanged(canUndo());
emit canRedoChanged(canRedo());
emit cleanChanged(isClean());
}
void UndoStack::undo() throw (Exception)
{
if ((!canUndo()) || (mCommandActive)) // if a command is active, undo() is not allowed
return;
mCommands[mCurrentIndex-1]->undo(); // throws an exception on error
mCurrentIndex--;
// emit signals
emit undoTextChanged(getUndoText());
emit redoTextChanged(getRedoText());
emit canUndoChanged(canUndo());
emit canRedoChanged(canRedo());
emit cleanChanged(isClean());
}
void UndoStack::abortCommand() throw (Exception)
{
Q_ASSERT(mCurrentIndex == mCommands.count());
if (!mCommandActive)
throw LogicError(__FILE__, __LINE__, QString(), tr("No command active!"));
mCommands.last()->undo(); // throws an exception on error
mCurrentIndex--;
mCommandActive = false;
delete mCommands.takeLast(); // delete and remove the aborted command from the stack
// emit signals
emit undoTextChanged(getUndoText());
emit redoTextChanged(tr("Redo"));
emit canUndoChanged(canUndo());
emit canRedoChanged(false);
emit cleanChanged(isClean());
emit commandAborted(); // this is important!
}
void KUndo2QStack::clear()
{
if (m_command_list.isEmpty())
return;
bool was_clean = isClean();
m_macro_stack.clear();
qDeleteAll(m_command_list);
m_command_list.clear();
m_index = 0;
m_clean_index = 0;
emit indexChanged(0);
emit canUndoChanged(false);
emit undoTextChanged(QString());
emit canRedoChanged(false);
emit redoTextChanged(QString());
if (!was_clean)
emit cleanChanged(true);
}
