108 lines
2.2 KiB
C++
108 lines
2.2 KiB
C++
#ifndef QTGUI_STACKSUPPORT_H
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#define QTGUI_STACKSUPPORT_H
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#include "./undocommands.h"
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#include <QUndoStack>
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#include <memory>
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#define PASSWORD_MANAGER_UNDO_SUPPORT
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namespace QtGui {
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class StackAbsorper;
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class StackSupport {
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friend class StackAbsorper;
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public:
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explicit StackSupport(QUndoStack *undoStack = nullptr);
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protected:
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QUndoStack *undoStack();
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bool push(std::unique_ptr<CustomUndoCommand> command);
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void clearUndoStack();
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private:
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QUndoStack *m_undoStack;
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};
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/*!
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* \brief Returns the undo stack for the current instance.
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*/
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inline QUndoStack *StackSupport::undoStack()
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{
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return m_undoStack;
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}
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/*!
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* \brief Pushes the specified custom undo \a command to the undo stack and returns whether the redo action was successful.
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*/
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inline bool StackSupport::push(std::unique_ptr<CustomUndoCommand> command)
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{
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if (!m_undoStack) {
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return false;
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}
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if (command->isNoop()) {
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return true; // doing nothing can never fail
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}
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auto *const rawCommand(command.release());
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m_undoStack->push(rawCommand);
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return rawCommand->redoResult();
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}
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/*!
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* \brief Clears the undo stack.
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*/
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inline void StackSupport::clearUndoStack()
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{
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if (m_undoStack) {
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m_undoStack->clear();
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}
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}
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/*!
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* \brief The StackAbsorper class is used by the CustomUndoCommand class to prevent infinite recursion when pushing
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* a new command to the stack.
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*/
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class StackAbsorper {
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public:
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explicit StackAbsorper(StackSupport *supported);
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~StackAbsorper();
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QUndoStack *stack();
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private:
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StackSupport *m_supported;
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QUndoStack *m_stack;
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};
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/*!
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* \brief Detaches the undo stack from the specified stack support temporary.
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*/
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inline StackAbsorper::StackAbsorper(StackSupport *supported)
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: m_supported(supported)
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, m_stack(supported->m_undoStack)
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{
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m_supported->m_undoStack = nullptr;
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}
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/*!
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* \brief Restores the undo stack of the stack support.
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*/
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inline StackAbsorper::~StackAbsorper()
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{
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m_supported->m_undoStack = m_stack;
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}
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/*!
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* \brief Returns the stack for the current instance.
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*/
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inline QUndoStack *StackAbsorper::stack()
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{
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return m_stack;
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}
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} // namespace QtGui
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#endif // QTGUI_STACKSUPPORT_H
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