src/common/cmdproc.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/cmdproc.cpp
   3 // Purpose:     wxCommand and wxCommandProcessor classes
   4 // Author:      Julian Smart (extracted from docview.h by VZ)
   5 // Modified by:
   6 // Created:     05.11.00
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWidgets team
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "cmdproc.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/intl.h"
  33     #include "wx/string.h"
  34     #include "wx/menu.h"
  35 #endif //WX_PRECOMP
  36
  37 #include "wx/cmdproc.h"
  38
  39 // ============================================================================
  40 // implementation
  41 // ============================================================================
  42
  43 IMPLEMENT_CLASS(wxCommand, wxObject)
  44 IMPLEMENT_DYNAMIC_CLASS(wxCommandProcessor, wxObject)
  45
  46 // ----------------------------------------------------------------------------
  47 // wxCommand
  48 // ----------------------------------------------------------------------------
  49
  50 wxCommand::wxCommand(bool canUndoIt, const wxString& name)
  51 {
  52     m_canUndo = canUndoIt;
  53     m_commandName = name;
  54 }
  55
  56 wxCommand::~wxCommand()
  57 {
  58 }
  59
  60 // ----------------------------------------------------------------------------
  61 // Command processor
  62 // ----------------------------------------------------------------------------
  63
  64 wxCommandProcessor::wxCommandProcessor(int maxCommands)
  65 {
  66     m_maxNoCommands = maxCommands;
  67 #if wxUSE_MENUS
  68     m_commandEditMenu = (wxMenu *) NULL;
  69 #endif // wxUSE_MENUS
  70     m_undoAccelerator = wxT("\tCtrl+Z");
  71     m_redoAccelerator = wxT("\tCtrl+Y");
  72 #if !wxUSE_STL
  73     m_currentCommand = NULL;
  74 #endif
  75 }
  76
  77 wxCommandProcessor::~wxCommandProcessor()
  78 {
  79     ClearCommands();
  80 }
  81
  82 bool wxCommandProcessor::DoCommand(wxCommand& cmd)
  83 {
  84     return cmd.Do();
  85 }
  86
  87 bool wxCommandProcessor::UndoCommand(wxCommand& cmd)
  88 {
  89     return cmd.Undo();
  90 }
  91
  92 // Pass a command to the processor. The processor calls Do();
  93 // if successful, is appended to the command history unless
  94 // storeIt is false.
  95 bool wxCommandProcessor::Submit(wxCommand *command, bool storeIt)
  96 {
  97     wxCHECK_MSG( command, false, _T("no command in wxCommandProcessor::Submit") );
  98
  99     if ( !DoCommand(*command) )
 100     {
 101         // the user code expects the command to be deleted anyhow
 102         delete command;
 103
 104         return false;
 105     }
 106
 107     if ( storeIt )
 108         Store(command);
 109
 110     return true;
 111 }
 112
 113 void wxCommandProcessor::Store(wxCommand *command)
 114 {
 115     wxCHECK_RET( command, _T("no command in wxCommandProcessor::Store") );
 116
 117     if ( (int)m_commands.GetCount() == m_maxNoCommands )
 118     {
 119         wxList::compatibility_iterator firstNode = m_commands.GetFirst();
 120         wxCommand *firstCommand = (wxCommand *)firstNode->GetData();
 121         delete firstCommand;
 122         m_commands.Erase(firstNode);
 123     }
 124
 125     // Correct a bug: we must chop off the current 'branch'
 126     // so that we're at the end of the command list.
 127     if (!m_currentCommand)
 128         ClearCommands();
 129     else
 130     {
 131         wxList::compatibility_iterator node = m_currentCommand->GetNext();
 132         while (node)
 133         {
 134             wxList::compatibility_iterator next = node->GetNext();
 135             delete (wxCommand *)node->GetData();
 136             m_commands.Erase(node);
 137             node = next;
 138         }
 139     }
 140
 141     m_commands.Append(command);
 142     m_currentCommand = m_commands.GetLast();
 143     SetMenuStrings();
 144 }
 145
 146 bool wxCommandProcessor::Undo()
 147 {
 148     wxCommand *command = GetCurrentCommand();
 149     if ( command && command->CanUndo() )
 150     {
 151         if ( UndoCommand(*command) )
 152         {
 153             m_currentCommand = m_currentCommand->GetPrevious();
 154             SetMenuStrings();
 155             return true;
 156         }
 157     }
 158
 159     return false;
 160 }
 161
 162 bool wxCommandProcessor::Redo()
 163 {
 164     wxCommand *redoCommand = (wxCommand *) NULL;
 165     wxList::compatibility_iterator redoNode
 166 #if !wxUSE_STL
 167         = NULL          // just to avoid warnings
 168 #endif // !wxUSE_STL
 169         ;
 170
 171     if ( m_currentCommand )
 172     {
 173         // is there anything to redo?
 174         if ( m_currentCommand->GetNext() )
 175         {
 176             redoCommand = (wxCommand *)m_currentCommand->GetNext()->GetData();
 177             redoNode = m_currentCommand->GetNext();
 178         }
 179     }
 180     else // no current command, redo the first one
 181     {
 182         if (m_commands.GetCount() > 0)
 183         {
 184             redoCommand = (wxCommand *)m_commands.GetFirst()->GetData();
 185             redoNode = m_commands.GetFirst();
 186         }
 187     }
 188
 189     if (redoCommand)
 190     {
 191         bool success = DoCommand(*redoCommand);
 192         if (success)
 193         {
 194             m_currentCommand = redoNode;
 195             SetMenuStrings();
 196             return true;
 197         }
 198     }
 199     return false;
 200 }
 201
 202 bool wxCommandProcessor::CanUndo() const
 203 {
 204     wxCommand *command = GetCurrentCommand();
 205
 206     return command && command->CanUndo();
 207 }
 208
 209 bool wxCommandProcessor::CanRedo() const
 210 {
 211     if (m_currentCommand && !m_currentCommand->GetNext())
 212         return false;
 213
 214     if (m_currentCommand && m_currentCommand->GetNext())
 215         return true;
 216
 217     if (!m_currentCommand && (m_commands.GetCount() > 0))
 218         return true;
 219
 220     return false;
 221 }
 222
 223 void wxCommandProcessor::Initialize()
 224 {
 225     m_currentCommand = m_commands.GetLast();
 226     SetMenuStrings();
 227 }
 228
 229 void wxCommandProcessor::SetMenuStrings()
 230 {
 231 #if wxUSE_MENUS
 232     if (m_commandEditMenu)
 233     {
 234         wxString undoLabel = GetUndoMenuLabel();
 235         wxString redoLabel = GetRedoMenuLabel();
 236
 237         m_commandEditMenu->SetLabel(wxID_UNDO, undoLabel);
 238         m_commandEditMenu->Enable(wxID_UNDO, CanUndo());
 239
 240         m_commandEditMenu->SetLabel(wxID_REDO, redoLabel);
 241         m_commandEditMenu->Enable(wxID_REDO, CanRedo());
 242     }
 243 #endif // wxUSE_MENUS
 244 }
 245
 246 // Gets the current Undo menu label.
 247 wxString wxCommandProcessor::GetUndoMenuLabel() const
 248 {
 249     wxString buf;
 250     if (m_currentCommand)
 251     {
 252         wxCommand *command = (wxCommand *)m_currentCommand->GetData();
 253         wxString commandName(command->GetName());
 254         if (commandName == wxT("")) commandName = _("Unnamed command");
 255         bool canUndo = command->CanUndo();
 256         if (canUndo)
 257             buf = wxString(_("&Undo ")) + commandName + m_undoAccelerator;
 258         else
 259             buf = wxString(_("Can't &Undo ")) + commandName + m_undoAccelerator;
 260     }
 261     else
 262     {
 263         buf = _("&Undo") + m_undoAccelerator;
 264     }
 265
 266     return buf;
 267 }
 268
 269 // Gets the current Undo menu label.
 270 wxString wxCommandProcessor::GetRedoMenuLabel() const
 271 {
 272     wxString buf;
 273     if (m_currentCommand)
 274     {
 275         // We can redo, if we're not at the end of the history.
 276         if (m_currentCommand->GetNext())
 277         {
 278             wxCommand *redoCommand = (wxCommand *)m_currentCommand->GetNext()->GetData();
 279             wxString redoCommandName(redoCommand->GetName());
 280             if (redoCommandName == wxT("")) redoCommandName = _("Unnamed command");
 281             buf = wxString(_("&Redo ")) + redoCommandName + m_redoAccelerator;
 282         }
 283         else
 284         {
 285             buf = _("&Redo") + m_redoAccelerator;
 286         }
 287     }
 288     else
 289     {
 290         if (m_commands.GetCount() == 0)
 291         {
 292             buf = _("&Redo") + m_redoAccelerator;
 293         }
 294         else
 295         {
 296             // currentCommand is NULL but there are commands: this means that
 297             // we've undone to the start of the list, but can redo the first.
 298             wxCommand *redoCommand = (wxCommand *)m_commands.GetFirst()->GetData();
 299             wxString redoCommandName(redoCommand->GetName());
 300             if (redoCommandName == wxT("")) redoCommandName = _("Unnamed command");
 301             buf = wxString(_("&Redo ")) + redoCommandName + m_redoAccelerator;
 302         }
 303     }
 304     return buf;
 305 }
 306
 307 void wxCommandProcessor::ClearCommands()
 308 {
 309     wxList::compatibility_iterator node = m_commands.GetFirst();
 310     while (node)
 311     {
 312         wxCommand *command = (wxCommand *)node->GetData();
 313         delete command;
 314         m_commands.Erase(node);
 315         node = m_commands.GetFirst();
 316     }
 317     m_currentCommand = wxList::compatibility_iterator();
 318 }
 319
 320