128 lines
2.7 KiB
C++
Executable File
128 lines
2.7 KiB
C++
Executable File
#include "Command.h"
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#include "CommandManager.h"
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CCommandManager g_CmdMan;
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CCommandManager::CCommandManager() : m_CommandHistoryLength(128), m_HistoryPos(-1)
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{
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}
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CCommandManager::~CCommandManager()
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{
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ClearHistory();
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}
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/////////////////////////////////////////////////////////////////////////////////////////
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// Append: add given command to the end of the history list, without
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// executing it
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void CCommandManager::Append(CCommand* cmd)
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{
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if (cmd->IsUndoable()) {
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// remove all existing commands from current position to end
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CommandList::iterator iter=GetIterator(m_HistoryPos+1);
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for (CommandList::iterator i=iter;i!=m_CommandHistory.end();++i) {
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delete *i;
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}
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m_CommandHistory.erase(iter,m_CommandHistory.end());
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// add new command to end
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m_CommandHistory.push_back(cmd);
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// check for history that's too big
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if (m_CommandHistory.size()>m_CommandHistoryLength) {
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CCommand* cmd=m_CommandHistory.front();
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m_CommandHistory.pop_front();
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delete cmd;
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}
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// update history position to point at last command executed
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m_HistoryPos=m_CommandHistory.size()-1;
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}
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}
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/////////////////////////////////////////////////////////////////////////////////////////
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// Execute: execute the given command, then add it to the end of the history list
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void CCommandManager::Execute(CCommand* cmd)
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{
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cmd->Execute();
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Append(cmd);
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}
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CCommandManager::CommandList::iterator CCommandManager::GetIterator(int pos)
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{
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if (pos<0 || uint(pos)>=m_CommandHistory.size()) return m_CommandHistory.end();
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typedef CommandList::iterator Iter;
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int count=0;
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for (Iter iter=m_CommandHistory.begin();iter!=m_CommandHistory.end();++iter) {
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if (count==pos) {
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return iter;
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}
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count++;
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}
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// hmm .. shouldn't get here
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return m_CommandHistory.end();
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}
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CCommand* CCommandManager::GetUndoCommand()
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{
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CommandList::iterator iter=GetIterator(m_HistoryPos);
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if (iter!=m_CommandHistory.end()) {
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return *iter;
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} else {
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return 0;
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}
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}
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void CCommandManager::Undo()
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{
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CCommand* cmd=GetUndoCommand();
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if (cmd) {
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cmd->Undo();
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m_HistoryPos--;
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}
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}
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const char* CCommandManager::GetUndoName()
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{
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CCommand* cmd=GetUndoCommand();
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return cmd ? cmd->GetName() : 0;
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}
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CCommand* CCommandManager::GetRedoCommand()
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{
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CommandList::iterator iter=GetIterator(m_HistoryPos+1);
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if (iter!=m_CommandHistory.end()) {
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return *iter;
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} else {
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return 0;
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}
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}
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void CCommandManager::Redo()
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{
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CCommand* cmd=GetRedoCommand();
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if (cmd) {
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cmd->Redo();
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m_HistoryPos++;
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}
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}
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const char* CCommandManager::GetRedoName()
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{
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CCommand* cmd=GetRedoCommand();
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return cmd ? cmd->GetName() : 0;
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}
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void CCommandManager::ClearHistory()
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{
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// empty out command history
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while (m_CommandHistory.size()>0) {
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CCommand* cmd=m_CommandHistory.front();
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m_CommandHistory.pop_front();
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delete cmd;
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}
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}
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