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LibGUI: Add UndoStack::on_state_change hook
This will allow clients to react to the undo stack changing state. It's invoked when the stack or clean index are changed.
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2 changed files with 25 additions and 0 deletions
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@ -38,6 +38,9 @@ void UndoStack::undo()
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auto& combo = m_stack[--m_stack_index];
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for (auto i = static_cast<ssize_t>(combo.commands.size()) - 1; i >= 0; i--)
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combo.commands[i].undo();
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if (on_state_change)
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on_state_change();
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}
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void UndoStack::redo()
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@ -48,6 +51,9 @@ void UndoStack::redo()
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auto& commands = m_stack[m_stack_index++].commands;
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for (auto& command : commands)
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command.redo();
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if (on_state_change)
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on_state_change();
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}
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void UndoStack::pop()
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@ -72,6 +78,9 @@ void UndoStack::push(NonnullOwnPtr<Command>&& command)
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}
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m_stack.last().commands.append(move(command));
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if (on_state_change)
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on_state_change();
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}
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void UndoStack::finalize_current_combo()
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@ -84,12 +93,20 @@ void UndoStack::finalize_current_combo()
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if (!m_stack.last().commands.is_empty()) {
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m_stack.append(make<Combo>());
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m_stack_index = m_stack.size() - 1;
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if (on_state_change)
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on_state_change();
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}
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}
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void UndoStack::set_current_unmodified()
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{
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if (m_clean_index.has_value() && m_clean_index.value() == m_stack_index)
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return;
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m_clean_index = m_stack_index;
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if (on_state_change)
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on_state_change();
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}
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bool UndoStack::is_current_modified() const
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@ -99,9 +116,15 @@ bool UndoStack::is_current_modified() const
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void UndoStack::clear()
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{
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if (m_stack.is_empty() && m_stack_index == 0 && !m_clean_index.has_value())
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return;
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m_stack.clear();
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m_stack_index = 0;
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m_clean_index.clear();
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if (on_state_change)
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on_state_change();
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}
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}
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