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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGUI/Command.h>
#include <LibGUI/UndoStack.h>
namespace GUI {
bool UndoStack::can_undo() const
{
return m_stack_index > 0;
}
bool UndoStack::can_redo() const
{
if (m_stack.is_empty())
return false;
return m_stack_index != m_stack.size();
}
void UndoStack::undo()
{
if (!can_undo())
return;
auto& command = m_stack[--m_stack_index];
command.undo();
if (on_state_change)
on_state_change();
}
void UndoStack::redo()
{
if (!can_redo())
return;
auto& command = m_stack[m_stack_index++];
command.redo();
if (on_state_change)
on_state_change();
}
ErrorOr<void> UndoStack::try_push(NonnullOwnPtr<Command> command)
{
// If the stack cursor is behind the top of the stack, nuke everything from here to the top.
while (m_stack.size() != m_stack_index)
(void)m_stack.take_last();
if (m_clean_index.has_value() && m_clean_index.value() > m_stack.size())
m_clean_index = {};
if (!m_stack.is_empty() && is_current_modified()) {
if (m_stack.last().merge_with(*command))
return {};
}
TRY(m_stack.try_append(move(command)));
m_stack_index = m_stack.size();
if (on_state_change)
on_state_change();
return {};
}
void UndoStack::push(NonnullOwnPtr<Command> command)
{
MUST(try_push(move(command)));
}
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;
m_last_unmodified_timestamp = Time::now_monotonic();
if (on_state_change)
on_state_change();
}
bool UndoStack::is_current_modified() const
{
if (m_stack.is_empty())
return false;
if (!m_clean_index.has_value())
return true;
if (m_stack_index != m_clean_index.value())
return true;
return false;
}
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();
}
Optional<String> UndoStack::undo_action_text() const
{
if (!can_undo())
return {};
return m_stack[m_stack_index - 1].action_text();
}
Optional<String> UndoStack::redo_action_text() const
{
if (!can_redo())
return {};
return m_stack[m_stack_index].action_text();
}
}
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