simplify code so it always returns the same object

[wxWidgets.git] / src / common / cmdproc.cpp

diff --git a/src/common/cmdproc.cpp b/src/common/cmdproc.cpp
index 2ab9be0b0d8e0a480b366d4a2b392d4d8d79945e..5e8a253ccbbeea631ee1ebc20eebcab533c600f0 100644 (file)
--- a/src/common/cmdproc.cpp
+++ b/src/common/cmdproc.cpp
@@ -60,8 +60,11 @@ wxCommandProcessor::wxCommandProcessor(int maxCommands)
 #if wxUSE_MENUS
     m_commandEditMenu = NULL;
 #endif // wxUSE_MENUS
+
+#if wxUSE_ACCEL
     m_undoAccelerator = '\t' + wxAcceleratorEntry(wxACCEL_CTRL, 'Z').ToString();
     m_redoAccelerator = '\t' + wxAcceleratorEntry(wxACCEL_CTRL, 'Y').ToString();
+#endif // wxUSE_ACCEL
 
     m_lastSavedCommand =
     m_currentCommand = wxList::compatibility_iterator();
@@ -109,18 +112,6 @@ void wxCommandProcessor::Store(wxCommand *command)
 {
     wxCHECK_RET( command, wxT("no command in wxCommandProcessor::Store") );
 
-    if ( (int)m_commands.GetCount() == m_maxNoCommands )
-    {
-        wxList::compatibility_iterator firstNode = m_commands.GetFirst();
-        wxCommand *firstCommand = (wxCommand *)firstNode->GetData();
-        delete firstCommand;
-        m_commands.Erase(firstNode);
-
-        // Make sure m_lastSavedCommand won't point to freed memory
-        if ( m_lastSavedCommand == firstNode )
-            m_lastSavedCommand = wxList::compatibility_iterator();
-    }
-
     // Correct a bug: we must chop off the current 'branch'
     // so that we're at the end of the command list.
     if (!m_currentCommand)
@@ -131,17 +122,31 @@ void wxCommandProcessor::Store(wxCommand *command)
         while (node)
         {
             wxList::compatibility_iterator next = node->GetNext();
-            delete (wxCommand *)node->GetData();
-            m_commands.Erase(node);
 
             // Make sure m_lastSavedCommand won't point to freed memory
-            if ( m_lastSavedCommand == node )
+            if ( m_lastSavedCommand && m_lastSavedCommand == node )
                 m_lastSavedCommand = wxList::compatibility_iterator();
 
+            delete (wxCommand *)node->GetData();
+            m_commands.Erase(node);
+
             node = next;
         }
     }
 
+    if ( (int)m_commands.GetCount() == m_maxNoCommands )
+    {
+        wxList::compatibility_iterator firstNode = m_commands.GetFirst();
+
+        // Make sure m_lastSavedCommand won't point to freed memory
+        if ( m_lastSavedCommand && m_lastSavedCommand == firstNode )
+            m_lastSavedCommand = wxList::compatibility_iterator();
+
+        wxCommand *firstCommand = (wxCommand *)firstNode->GetData();
+        delete firstCommand;
+        m_commands.Erase(firstNode);
+    }
+
     m_commands.Append(command);
     m_currentCommand = m_commands.GetLast();
     SetMenuStrings();
@@ -167,9 +172,9 @@ bool wxCommandProcessor::Redo()
 {
     wxCommand *redoCommand = NULL;
     wxList::compatibility_iterator redoNode
-#if !wxUSE_STL
+#if !wxUSE_STD_CONTAINERS
         = NULL          // just to avoid warnings
-#endif // !wxUSE_STL
+#endif // !wxUSE_STD_CONTAINERS
         ;
 
     if ( m_currentCommand )
@@ -323,4 +328,28 @@ void wxCommandProcessor::ClearCommands()
     m_lastSavedCommand = wxList::compatibility_iterator();
 }
 
+bool wxCommandProcessor::IsDirty() const
+{
+    if ( m_commands.empty() )
+    {
+        // If we have never been modified, we can't be dirty.
+        return false;
+    }
+
+    if ( !m_lastSavedCommand )
+    {
+        // If we have been modified but have never been saved, we're dirty.
+        return true;
+    }
+
+    if ( !m_currentCommand )
+    {
+        // This only happens if all commands were undone after saving the
+        // document: we're dirty then.
+        return true;
+    }
+
+    // Finally if both iterators are valid, we may just compare them.
+    return m_currentCommand != m_lastSavedCommand;
+}