f430da1d45
This patch converts the undo stack from GTextDocument into GUndoStack, and GTextDocumentUndoCommand now inherits from GCommand. Let's turn this into a generic mechanism that can be used to implement undo/redo in any application. :^)
89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
#include <LibGUI/GUndoStack.h>
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GUndoStack::GUndoStack()
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{
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}
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GUndoStack::~GUndoStack()
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{
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}
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void GUndoStack::undo()
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{
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if (!can_undo())
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return;
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auto& undo_container = m_stack[m_stack_index];
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auto& undo_vector = undo_container.m_undo_vector;
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//If we try to undo a empty vector, delete it and skip over.
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if (undo_vector.is_empty()) {
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m_stack.remove(m_stack_index);
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undo();
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return;
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}
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for (int i = 0; i < undo_vector.size(); i++) {
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auto& undo_command = undo_vector[i];
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undo_command.undo();
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}
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m_stack_index++;
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}
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void GUndoStack::redo()
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{
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if (!can_redo())
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return;
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auto& undo_container = m_stack[m_stack_index - 1];
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auto& redo_vector = undo_container.m_undo_vector;
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for (int i = redo_vector.size() - 1; i >= 0; i--) {
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auto& undo_command = redo_vector[i];
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undo_command.redo();
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}
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m_stack_index--;
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}
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void GUndoStack::push(NonnullOwnPtr<GCommand>&& command)
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{
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if (m_stack.is_empty()) {
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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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// Clear the elements of the stack before the m_undo_stack_index (Excluding our new element)
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for (int i = 1; i < m_stack_index; i++)
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m_stack.remove(1);
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if (m_stack_index > 0 && !m_stack.is_empty())
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m_stack[0].m_undo_vector.clear();
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m_stack_index = 0;
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m_stack[0].m_undo_vector.prepend(move(command));
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}
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void GUndoStack::finalize_current_combo()
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{
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if (m_stack.is_empty())
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return;
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auto& undo_vector = m_stack[0].m_undo_vector;
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if (undo_vector.size() == m_last_updated_undo_vector_size && !undo_vector.is_empty()) {
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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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// Note: Remove dbg() if we're 100% sure there are no bugs left.
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dbg() << "Undo stack increased to " << m_stack.size();
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// Shift the index to the left since we're adding an empty container.
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if (m_stack_index > 0)
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m_stack_index++;
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}
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m_last_updated_undo_vector_size = undo_vector.size();
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}
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