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LibGUI: Support merging of adjacent commands on the UndoStack

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When pushing a new command on an undo stack, we will now attempt to
merge it into the stack's current command.

Merging is implemented by overriding the "merge_with(Command const&)"
virtual on GUI::Command. :^)
This commit is contained in:
Andreas Kling 2021-05-08 16:49:36 +02:00
parent 244665d99c
commit ff912946ae
2 changed files with 8 additions and 0 deletions
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6
Userland/Libraries/LibGUI/UndoStack.cpp
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@ -77,6 +77,12 @@ void UndoStack::push(NonnullOwnPtr<Command>&& command)
finalize_current_combo();
}
if (!m_stack.last().commands.is_empty()) {
bool merged = m_stack.last().commands.last().merge_with(*command);
if (merged)
return;
}
m_stack.last().commands.append(move(command));
if (on_state_change)