210040016e
This fixes the warning for MSVC, which warned about "forcing value to bool 'true' or 'false'", without introducing one for gcc which would complain if we compared the value, of compatibility_iterator type, with NULL. This backports the changes of r75445 and r75653 from master.
353 lines
9.6 KiB
C++
353 lines
9.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: src/common/cmdproc.cpp
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// Purpose: wxCommand and wxCommandProcessor classes
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// Author: Julian Smart (extracted from docview.h by VZ)
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// Modified by:
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// Created: 05.11.00
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// Copyright: (c) wxWidgets team
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#ifndef WX_PRECOMP
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#include "wx/intl.h"
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#include "wx/string.h"
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#include "wx/menu.h"
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#include "wx/accel.h"
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#endif //WX_PRECOMP
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#include "wx/cmdproc.h"
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// ============================================================================
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// implementation
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// ============================================================================
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IMPLEMENT_CLASS(wxCommand, wxObject)
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IMPLEMENT_DYNAMIC_CLASS(wxCommandProcessor, wxObject)
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// ----------------------------------------------------------------------------
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// wxCommand
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// ----------------------------------------------------------------------------
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wxCommand::wxCommand(bool canUndoIt, const wxString& name)
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{
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m_canUndo = canUndoIt;
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m_commandName = name;
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}
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// ----------------------------------------------------------------------------
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// Command processor
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// ----------------------------------------------------------------------------
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wxCommandProcessor::wxCommandProcessor(int maxCommands)
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{
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m_maxNoCommands = maxCommands;
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#if wxUSE_MENUS
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m_commandEditMenu = NULL;
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#endif // wxUSE_MENUS
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#if wxUSE_ACCEL
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m_undoAccelerator = '\t' + wxAcceleratorEntry(wxACCEL_CTRL, 'Z').ToString();
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m_redoAccelerator = '\t' + wxAcceleratorEntry(wxACCEL_CTRL, 'Y').ToString();
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#endif // wxUSE_ACCEL
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m_lastSavedCommand =
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m_currentCommand = wxList::compatibility_iterator();
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}
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wxCommandProcessor::~wxCommandProcessor()
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{
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ClearCommands();
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}
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bool wxCommandProcessor::DoCommand(wxCommand& cmd)
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{
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return cmd.Do();
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}
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bool wxCommandProcessor::UndoCommand(wxCommand& cmd)
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{
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return cmd.Undo();
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}
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// Pass a command to the processor. The processor calls Do();
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// if successful, is appended to the command history unless
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// storeIt is false.
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bool wxCommandProcessor::Submit(wxCommand *command, bool storeIt)
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{
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wxCHECK_MSG( command, false, wxT("no command in wxCommandProcessor::Submit") );
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if ( !DoCommand(*command) )
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{
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// the user code expects the command to be deleted anyhow
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delete command;
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return false;
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}
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if ( storeIt )
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Store(command);
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else
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delete command;
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return true;
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}
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void wxCommandProcessor::Store(wxCommand *command)
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{
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wxCHECK_RET( command, wxT("no command in wxCommandProcessor::Store") );
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// Correct a bug: we must chop off the current 'branch'
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// so that we're at the end of the command list.
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if (!m_currentCommand)
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ClearCommands();
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else
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{
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wxList::compatibility_iterator node = m_currentCommand->GetNext();
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while (node)
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{
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wxList::compatibility_iterator next = node->GetNext();
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// Make sure m_lastSavedCommand won't point to freed memory
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if ( m_lastSavedCommand && m_lastSavedCommand == node )
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m_lastSavedCommand = wxList::compatibility_iterator();
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delete (wxCommand *)node->GetData();
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m_commands.Erase(node);
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node = next;
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}
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}
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if ( (int)m_commands.GetCount() == m_maxNoCommands )
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{
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wxList::compatibility_iterator firstNode = m_commands.GetFirst();
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// Make sure m_lastSavedCommand won't point to freed memory
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if ( m_lastSavedCommand && m_lastSavedCommand == firstNode )
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m_lastSavedCommand = wxList::compatibility_iterator();
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wxCommand *firstCommand = (wxCommand *)firstNode->GetData();
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delete firstCommand;
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m_commands.Erase(firstNode);
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}
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m_commands.Append(command);
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m_currentCommand = m_commands.GetLast();
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SetMenuStrings();
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}
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bool wxCommandProcessor::Undo()
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{
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wxCommand *command = GetCurrentCommand();
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if ( command && command->CanUndo() )
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{
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if ( UndoCommand(*command) )
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{
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m_currentCommand = m_currentCommand->GetPrevious();
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SetMenuStrings();
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return true;
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}
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}
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return false;
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}
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bool wxCommandProcessor::Redo()
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{
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wxCommand *redoCommand = NULL;
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wxList::compatibility_iterator redoNode
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#if !wxUSE_STD_CONTAINERS
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= NULL // just to avoid warnings
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#endif // !wxUSE_STD_CONTAINERS
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;
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if ( m_currentCommand )
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{
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// is there anything to redo?
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if ( m_currentCommand->GetNext() )
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{
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redoCommand = (wxCommand *)m_currentCommand->GetNext()->GetData();
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redoNode = m_currentCommand->GetNext();
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}
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}
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else // no current command, redo the first one
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{
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if (m_commands.GetCount() > 0)
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{
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redoCommand = (wxCommand *)m_commands.GetFirst()->GetData();
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redoNode = m_commands.GetFirst();
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}
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}
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if (redoCommand)
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{
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bool success = DoCommand(*redoCommand);
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if (success)
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{
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m_currentCommand = redoNode;
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SetMenuStrings();
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return true;
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}
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}
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return false;
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}
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bool wxCommandProcessor::CanUndo() const
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{
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wxCommand *command = GetCurrentCommand();
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return command && command->CanUndo();
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}
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bool wxCommandProcessor::CanRedo() const
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{
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if (m_currentCommand && !m_currentCommand->GetNext())
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return false;
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if (m_currentCommand && m_currentCommand->GetNext())
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return true;
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if (!m_currentCommand && (m_commands.GetCount() > 0))
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return true;
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return false;
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}
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void wxCommandProcessor::Initialize()
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{
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m_currentCommand = m_commands.GetLast();
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SetMenuStrings();
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}
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void wxCommandProcessor::SetMenuStrings()
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{
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#if wxUSE_MENUS
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if (m_commandEditMenu)
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{
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wxString undoLabel = GetUndoMenuLabel();
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wxString redoLabel = GetRedoMenuLabel();
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m_commandEditMenu->SetLabel(wxID_UNDO, undoLabel);
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m_commandEditMenu->Enable(wxID_UNDO, CanUndo());
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m_commandEditMenu->SetLabel(wxID_REDO, redoLabel);
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m_commandEditMenu->Enable(wxID_REDO, CanRedo());
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}
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#endif // wxUSE_MENUS
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}
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// Gets the current Undo menu label.
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wxString wxCommandProcessor::GetUndoMenuLabel() const
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{
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wxString buf;
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if (m_currentCommand)
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{
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wxCommand *command = (wxCommand *)m_currentCommand->GetData();
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wxString commandName(command->GetName());
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if (commandName.empty()) commandName = _("Unnamed command");
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bool canUndo = command->CanUndo();
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if (canUndo)
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buf = wxString(_("&Undo ")) + commandName + m_undoAccelerator;
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else
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buf = wxString(_("Can't &Undo ")) + commandName + m_undoAccelerator;
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}
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else
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{
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buf = _("&Undo") + m_undoAccelerator;
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}
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return buf;
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}
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// Gets the current Undo menu label.
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wxString wxCommandProcessor::GetRedoMenuLabel() const
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{
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wxString buf;
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if (m_currentCommand)
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{
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// We can redo, if we're not at the end of the history.
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if (m_currentCommand->GetNext())
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{
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wxCommand *redoCommand = (wxCommand *)m_currentCommand->GetNext()->GetData();
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wxString redoCommandName(redoCommand->GetName());
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if (redoCommandName.empty()) redoCommandName = _("Unnamed command");
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buf = wxString(_("&Redo ")) + redoCommandName + m_redoAccelerator;
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}
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else
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{
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buf = _("&Redo") + m_redoAccelerator;
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}
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}
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else
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{
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if (m_commands.GetCount() == 0)
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{
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buf = _("&Redo") + m_redoAccelerator;
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}
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else
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{
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// currentCommand is NULL but there are commands: this means that
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// we've undone to the start of the list, but can redo the first.
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wxCommand *redoCommand = (wxCommand *)m_commands.GetFirst()->GetData();
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wxString redoCommandName(redoCommand->GetName());
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if (redoCommandName.empty()) redoCommandName = _("Unnamed command");
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buf = wxString(_("&Redo ")) + redoCommandName + m_redoAccelerator;
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}
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}
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return buf;
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}
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void wxCommandProcessor::ClearCommands()
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{
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wxList::compatibility_iterator node = m_commands.GetFirst();
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while (node)
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{
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wxCommand *command = (wxCommand *)node->GetData();
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delete command;
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m_commands.Erase(node);
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node = m_commands.GetFirst();
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}
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m_currentCommand = wxList::compatibility_iterator();
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m_lastSavedCommand = wxList::compatibility_iterator();
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}
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bool wxCommandProcessor::IsDirty() const
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{
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if ( !m_lastSavedCommand )
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{
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// We have never been saved, so we are dirty if and only if we have any
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// commands at all.
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//
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// NB: The ugly "!!" test is needed to avoid warnings both from MSVC in
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// non-STL build and g++ in STL build.
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return !!m_currentCommand;
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}
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if ( !m_currentCommand )
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{
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// This only happens if all commands were undone after saving the
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// document: we're dirty then.
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return true;
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}
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// Finally if both iterators are valid, we may just compare them.
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return m_currentCommand != m_lastSavedCommand;
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}
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