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104 lines
3.0 KiB
C++
104 lines
3.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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& container = m_stack[m_stack_index++];
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if (container.m_undo_vector.size() == 0)
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continue;
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for (auto& command : container.m_undo_vector)
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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& vector = m_stack[m_stack_index].m_undo_vector;
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for (int i = vector.size() - 1; i >= 0; i--)
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vector[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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m_stack_index = 0;
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finalize_current_combo();
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}
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auto& current_vector = m_stack.first().m_undo_vector;
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current_vector.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().m_undo_vector.size() == 0)
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return;
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auto undo_commands_container = make<UndoCommandsContainer>();
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m_stack.prepend(move(undo_commands_container));
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}
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}
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