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2ef4fbc5c1
This reverts commit 0b7e19e2bb.
Let's reverse the direction of the undo stack to fix the confusion.
114 lines
2.4 KiB
C++
114 lines
2.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGUI/Command.h>
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#include <LibGUI/UndoStack.h>
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namespace GUI {
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UndoStack::UndoStack()
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{
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}
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UndoStack::~UndoStack()
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{
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}
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void UndoStack::undo()
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{
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if (!can_undo())
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return;
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auto pop_container_and_undo = [this]() {
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for (;;) {
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if (m_stack_index >= m_stack.size())
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break;
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auto& combo = m_stack[m_stack_index++];
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if (combo.commands.size() == 0)
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continue;
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for (auto& command : combo.commands)
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command.undo();
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break;
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}
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};
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// If this is the first undo, finish off our current combo
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if (m_stack_index == 0)
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finalize_current_combo();
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pop_container_and_undo();
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}
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void UndoStack::redo()
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{
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if (!can_redo())
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return;
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m_stack_index -= 1;
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auto& commands = m_stack[m_stack_index].commands;
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for (int i = commands.size() - 1; i >= 0; i--)
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commands[i].redo();
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}
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void UndoStack::push(NonnullOwnPtr<Command>&& command)
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{
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if (m_stack.is_empty())
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finalize_current_combo();
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if (m_stack_index > 0) {
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for (size_t i = 0; i < m_stack_index; i++)
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m_stack.remove(0);
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if (m_clean_index.has_value()) {
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if (m_clean_index.value() < m_stack_index)
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m_clean_index.clear();
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else
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m_clean_index = m_clean_index.value() - m_stack_index;
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}
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m_stack_index = 0;
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finalize_current_combo();
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}
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m_stack.first().commands.prepend(move(command));
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}
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void UndoStack::finalize_current_combo()
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{
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if (m_stack_index > 0)
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return;
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if (m_stack.size() != 0 && m_stack.first().commands.size() == 0)
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return;
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auto undo_commands_container = make<Combo>();
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m_stack.prepend(move(undo_commands_container));
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if (m_clean_index.has_value())
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m_clean_index = m_clean_index.value() + 1;
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}
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void UndoStack::set_current_unmodified()
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{
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// Skip empty container
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if (can_undo() && m_stack[m_stack_index].commands.is_empty())
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m_clean_index = m_stack_index + 1;
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else
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m_clean_index = m_stack_index;
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}
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bool UndoStack::is_current_modified() const
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{
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return !m_clean_index.has_value() || m_stack_index != m_clean_index.value();
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}
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void UndoStack::clear()
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{
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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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}
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}
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