Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/dtmail/MotifApp/Cmd.C

@@ -0,0 +1,242 @@
+/* $TOG: Cmd.C /main/4 1998/07/24 16:04:37 mgreess $ */
+/*
+ *+SNOTICE
+ *
+ *	RESTRICTED CONFIDENTIAL INFORMATION:
+ *	
+ *	The information in this document is subject to special
+ *	restrictions in a confidential disclosure agreement bertween
+ *	HP, IBM, Sun, USL, SCO and Univel.  Do not distribute this
+ *	document outside HP, IBM, Sun, USL, SCO, or Univel wihtout
+ *	Sun's specific written approval.  This documment and all copies
+ *	and derivative works thereof must be returned or destroyed at
+ *	Sun's request.
+ *
+ *	Copyright 1993 Sun Microsystems, Inc.  All rights reserved.
+ *
+ *+ENOTICE
+ */
+///////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+//         This example code is from the book:
+//
+//           Object-Oriented Programming with C++ and OSF/Motif
+//         by
+//           Douglas Young
+//           Prentice Hall, 1992
+//           ISBN 0-13-630252-1	
+//
+//         Copyright 1991 by Prentice Hall
+//         All Rights Reserved
+//
+//  Permission to use, copy, modify, and distribute this software for 
+//  any purpose except publication and without fee is hereby granted, provided 
+//  that the above copyright notice appear in all copies of the software.
+///////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////
+// Cmd.C
+///////////////////////////////////////////////////////
+#include <stdlib.h>
+#include "Cmd.h"
+#include "CmdList.h"
+#include "CmdInterface.h"
+
+extern Cmd *theUndoCmd;  // External object that reverses the 
+// most recent Cmd when executed
+
+Cmd *Cmd::_lastCmd = NULL;  // Pointer to most recent Cmd
+
+Cmd::Cmd ( char *name, char *label, int active )
+{
+    // Initialize all data members
+    
+    _name              = name;  
+    _active            = active;  
+    _numInterfaces     = 0;    
+    _ci                = NULL;
+    _activationList    = NULL;
+    _deactivationList  = NULL;
+    _hasUndo           = TRUE;
+
+    if (label) {
+	_label         = strdup(label);
+    } else {
+	_label         = strdup(name);
+    }
+}
+
+Cmd::~Cmd()
+{
+    delete _activationList;	
+    delete _deactivationList;	
+    free (_label);
+    if (_ci)
+	delete [] _ci;
+}
+
+void Cmd::registerInterface ( CmdInterface *ci )
+{
+    // Make a new list, large enough for the new object
+    
+    CmdInterface **newList = new CmdInterface*[_numInterfaces + 1];
+    
+    // Copy the contents of the previous list to
+    // the new list
+    
+    for( int i = 0; i < _numInterfaces; i++)
+	newList[i] = _ci[i];
+    
+    // Free the old list
+    
+    if (_ci)
+	delete []_ci;
+    
+    // Install the new list
+    
+    _ci =  newList;
+    
+    // Add the object to the list and update the list size.
+    
+    _ci[_numInterfaces] = ci;
+    
+    _numInterfaces++;
+    
+    if ( ci )
+	if ( _active )
+	    ci->activate();
+	else
+	    ci->deactivate();      
+}
+
+void Cmd::activate()
+{
+    // Activate the associated interfaces
+    
+    for ( int i = 0; i < _numInterfaces; i++ )
+	_ci[i]->activate ();
+    
+    // Save the current value of active before setting the new state
+    
+    _previouslyActive = _active;
+    _active = TRUE;
+}
+
+void Cmd::deactivate()
+{
+    // Deactivate the associated interfaces
+    
+    for ( int i = 0; i < _numInterfaces; i++ )
+	_ci[i]->deactivate ();
+    
+    // Save the current value of active before setting the new state
+    
+    _previouslyActive = _active;
+    _active = FALSE;
+}
+
+void Cmd::revert()
+{
+    // Activate or deactivate, as necessary, 
+    // to return to the previous state
+    
+    if ( _previouslyActive )
+	activate();
+    else
+	deactivate();
+}
+
+#ifdef DEAD_WOOD
+void Cmd::addToActivationList ( Cmd *cmd )
+{
+    if ( !_activationList )
+	_activationList = new CmdList();
+    
+    _activationList->add ( cmd );
+}
+
+void Cmd::addToDeactivationList ( Cmd *cmd )
+{
+    if ( !_deactivationList )
+	_deactivationList = new CmdList();
+    
+    _deactivationList->add ( cmd );
+}
+#endif /* DEAD_WOOD */
+
+void Cmd::execute()
+{
+    int i;      
+    
+    // If a command is inactive, it cannot be executed
+    
+    if ( !_active )
+	return;
+    
+
+    // Activate or deactivate the global theUndoCmd, 
+    // and remember the last command, as needed
+    
+    if ( _hasUndo )
+    {
+	Cmd::_lastCmd = this;
+	theUndoCmd->activate();
+    }
+    else  
+    {      
+	Cmd::_lastCmd = NULL;
+	theUndoCmd->deactivate();
+    }
+    
+    // Process the commands that depend on this one
+    
+    if ( _activationList )    
+	for ( i = 0; i < _activationList->size(); i++ )
+	    (*_activationList)[i]->activate();
+    
+    if ( _deactivationList )    
+	for ( i = 0; i < _deactivationList->size(); i++ )
+	    (*_deactivationList)[i]->deactivate();
+
+
+    // Call the derived class's doit member function to 
+    // perform the action represented by this object
+    
+    doit();
+    
+}
+
+void Cmd::undo()
+{
+    int i;
+    
+    // Call the derived class's undoit() member function.
+    
+    undoit();
+    
+    // The system only supports one level of undo, and this is it,
+    // so deactivate the undo facility.
+    
+    theUndoCmd->deactivate();
+    
+    // Reverse the effects of the execute() member function by 
+    // reverting all dependent objects to their previous state
+    
+    if ( _activationList )        
+	for ( i = 0; i < _activationList->size(); i++ )
+	    (*_activationList)[i]->revert();
+    
+    if ( _deactivationList )    
+	for ( i = 0; i < _deactivationList->size(); i++ )
+	    (*_deactivationList)[i]->revert();
+}
+
+#ifndef CAN_INLINE_VIRTUALS
+const char *const
+Cmd::className(void)
+{
+    return "Cmd";
+}
+#endif /* ! CAN_INLINE_VIRTUALS */