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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGUI/Command.h>
#include <LibGUI/UndoStack.h>
namespace GUI {
UndoStack::UndoStack()
{
}
UndoStack::~UndoStack()
{
}
void UndoStack::undo()
{
if (!can_undo())
return;
auto pop_container_and_undo = [this]() {
for (;;) {
if (m_stack_index >= m_stack.size())
break;
auto& combo = m_stack[m_stack_index++];
if (combo.commands.size() == 0)
continue;
for (auto& command : combo.commands)
command.undo();
break;
}
};
// If this is the first undo, finish off our current combo
if (m_stack_index == 0)
finalize_current_combo();
pop_container_and_undo();
}
void UndoStack::redo()
{
if (!can_redo())
return;
m_stack_index -= 1;
auto& commands = m_stack[m_stack_index].commands;
for (int i = commands.size() - 1; i >= 0; i--)
commands[i].redo();
}
void UndoStack::push(NonnullOwnPtr<Command>&& command)
{
if (m_stack.is_empty())
finalize_current_combo();
if (m_stack_index > 0) {
for (size_t i = 0; i < m_stack_index; i++)
m_stack.remove(0);
if (m_clean_index.has_value()) {
if (m_clean_index.value() < m_stack_index)
m_clean_index.clear();
else
m_clean_index = m_clean_index.value() - m_stack_index;
}
m_stack_index = 0;
finalize_current_combo();
}
m_stack.first().commands.prepend(move(command));
}
void UndoStack::finalize_current_combo()
{
if (m_stack_index > 0)
return;
if (m_stack.size() != 0 && m_stack.first().commands.size() == 0)
return;
auto undo_commands_container = make<Combo>();
m_stack.prepend(move(undo_commands_container));
if (m_clean_index.has_value())
m_clean_index = m_clean_index.value() + 1;
}
void UndoStack::set_current_unmodified()
{
// Skip empty container
if (can_undo() && m_stack[m_stack_index].commands.is_empty())
m_clean_index = m_stack_index + 1;
else
m_clean_index = m_stack_index;
}
bool UndoStack::is_current_modified() const
{
return !m_clean_index.has_value() || m_stack_index != m_clean_index.value();
}
void UndoStack::clear()
{
m_stack.clear();
m_stack_index = 0;
m_clean_index.clear();
}
}
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