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LibGUI: Add UndoStack::on_state_change hook

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This will allow clients to react to the undo stack changing state.
It's invoked when the stack or clean index are changed.
This commit is contained in:
Andreas Kling 2021-05-08 13:14:52 +02:00
parent 74a4571f02
commit 0cb6103928
2 changed files with 25 additions and 0 deletions
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23
Userland/Libraries/LibGUI/UndoStack.cpp
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@ -38,6 +38,9 @@ void UndoStack::undo()
auto& combo = m_stack[--m_stack_index];
for (auto i = static_cast<ssize_t>(combo.commands.size()) - 1; i >= 0; i--)
combo.commands[i].undo();
if (on_state_change)
on_state_change();
}
void UndoStack::redo()
@ -48,6 +51,9 @@ void UndoStack::redo()
auto& commands = m_stack[m_stack_index++].commands;
for (auto& command : commands)
command.redo();
if (on_state_change)
on_state_change();
}
void UndoStack::pop()
@ -72,6 +78,9 @@ void UndoStack::push(NonnullOwnPtr<Command>&& command)
}
m_stack.last().commands.append(move(command));
if (on_state_change)
on_state_change();
}
void UndoStack::finalize_current_combo()
@ -84,12 +93,20 @@ void UndoStack::finalize_current_combo()
if (!m_stack.last().commands.is_empty()) {
m_stack.append(make<Combo>());
m_stack_index = m_stack.size() - 1;
if (on_state_change)
on_state_change();
}
}
void UndoStack::set_current_unmodified()
{
if (m_clean_index.has_value() && m_clean_index.value() == m_stack_index)
return;
m_clean_index = m_stack_index;
if (on_state_change)
on_state_change();
}
bool UndoStack::is_current_modified() const
@ -99,9 +116,15 @@ bool UndoStack::is_current_modified() const
void UndoStack::clear()
{
if (m_stack.is_empty() && m_stack_index == 0 && !m_clean_index.has_value())
return;
m_stack.clear();
m_stack_index = 0;
m_clean_index.clear();
if (on_state_change)
on_state_change();
}
}