64 lines
1.3 KiB
C++
64 lines
1.3 KiB
C++
#pragma once
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#ifndef REAL_BUILD
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# include "externals.hh"
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#endif
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// Interface for undo actions
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class A_UndoAction
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{
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public:
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virtual ~A_UndoAction( ) = 0;
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virtual void undo( ) const noexcept = 0;
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virtual void redo( ) const noexcept = 0;
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};
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using P_UndoAction = T_OwnPtr< A_UndoAction >;
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// Undo manager
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class T_UndoManager
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{
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private:
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static constexpr uint32_t MaxUndo = 1024;
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ebcl::T_StaticArray< P_UndoAction , MaxUndo > actions_;
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uint32_t start_{ 0 };
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uint32_t count_{ 0 };
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uint32_t pos_{ 0 };
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public:
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T_UndoManager( ) noexcept;
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DEF_MOVE( T_UndoManager );
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NO_COPY( T_UndoManager );
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// Undo last action
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void undo( ) noexcept;
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// Redo last undone action
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void redo( ) noexcept;
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// Check if it is possible to undo or redo
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bool canUndo( ) const noexcept
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{ return pos_ > 0; }
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bool canRedo( ) const noexcept
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{ return pos_ < count_; }
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// Add an action using a pointer
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A_UndoAction& addAction( P_UndoAction action ) noexcept;
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// Construct and add an action
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template<
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typename T ,
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typename... Args
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> T& add( Args&&... args ) noexcept;
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};
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template<
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typename T ,
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typename... Args
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> inline T& T_UndoManager::add(
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Args&&... args ) noexcept
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{
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return reinterpret_cast< T& >( addAction(
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NewOwned< T >( std::forward< Args >( args ) ... ) ) );
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}
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