54 lines
1 KiB
C++
54 lines
1 KiB
C++
#include "externals.hh"
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#include "c-undo.hh"
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/*= A_UndoAction ===============================================================*/
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A_UndoAction::~A_UndoAction( )
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{}
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/*= T_UndoManager ==============================================================*/
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T_UndoManager::T_UndoManager( ) noexcept
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{
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while ( actions_.size( ) < MaxUndo ) {
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actions_.addNew( );
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}
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}
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void T_UndoManager::undo( ) noexcept
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{
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if ( pos_ > 0 ) {
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pos_ --;
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actions_[ ( start_ + pos_ ) % MaxUndo ]->undo( );
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}
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}
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void T_UndoManager::redo( ) noexcept
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{
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if ( pos_ < count_ ) {
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actions_[ ( start_ + pos_ ) % MaxUndo ]->redo( );
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pos_ ++;
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}
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}
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A_UndoAction& T_UndoManager::addAction(
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P_UndoAction action ) noexcept
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{
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assert( action );
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while ( pos_ < count_ ) {
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count_ --;
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actions_[ ( start_ + count_ ) % MaxUndo ].clear( );
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}
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const auto ai{ count_ == MaxUndo ? start_ : ( ( start_ + pos_ ) % MaxUndo ) };
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if ( count_ == MaxUndo ) {
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start_ = ( start_ + 1 ) % MaxUndo;
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} else {
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count_ ++;
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pos_ ++;
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}
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actions_[ ai ] = std::move( action );
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return *actions_[ ai ];
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}
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