Fix Eeschema sheet issues. Should close out bug lp:593782

* Refresh canvas when user cancels edits so that the discarded sheet is
  cleared from the schematic.
* Add file name validation to the sheet properties dialog to prevent
  illegal file name characters from being entered into the text control.
* Rename FOOTPRINT_NAME_VALIDATOR to FILE_NAME_CHAR_VALIDATOR for clarity.

common/validators.cpp

@@ -31,7 +31,7 @@
 #include <validators.h>
 
 
-FOOTPRINT_NAME_VALIDATOR::FOOTPRINT_NAME_VALIDATOR( wxString* aValue ) :
+FILE_NAME_CHAR_VALIDATOR::FILE_NAME_CHAR_VALIDATOR( wxString* aValue ) :
     wxTextValidator( wxFILTER_EXCLUDE_CHAR_LIST, aValue )
 {
     // The Windows (DOS) file system forbidden characters already include the forbidden

eeschema/dialogs/dialog_sch_sheet_props.cpp

 #include <wx/string.h>
 #include <dialog_sch_sheet_props.h>
+#include <validators.h>
+
 
 DIALOG_SCH_SHEET_PROPS::DIALOG_SCH_SHEET_PROPS( wxWindow* parent ) :
     DIALOG_SCH_SHEET_PROPS_BASE( parent )
 {
+    m_textFileName->SetValidator( FILE_NAME_CHAR_VALIDATOR() );
     m_textFileName->SetFocus();
     m_sdbSizer1OK->SetDefault();
 }
 
+
 void DIALOG_SCH_SHEET_PROPS::SetFileName( const wxString& aFileName )
 {
     // Filenames are stored using unix notation
@@ -18,6 +22,7 @@ void DIALOG_SCH_SHEET_PROPS::SetFileName( const wxString& aFileName )
     m_textFileName->SetValue( fname );
 }
 
+
 const wxString DIALOG_SCH_SHEET_PROPS::GetFileName()
 {
     // Filenames are stored using unix notation

eeschema/sheet.cpp

@@ -75,6 +75,10 @@ bool SCH_EDIT_FRAME::EditSheet( SCH_SHEET* aSheet, wxDC* aDC )
     if( !fileName.IsOk() )
     {
         DisplayError( this, _( "File name is not valid!" ) );
+
+        if( m_canvas )
+            m_canvas->Refresh();
+
         return false;
     }
 
@@ -85,6 +89,10 @@ bool SCH_EDIT_FRAME::EditSheet( SCH_SHEET* aSheet, wxDC* aDC )
     {
         DisplayError( this, wxString::Format( _( "A sheet named \"%s\" already exists." ),
                                               GetChars( dlg.GetSheetName() ) ) );
+
+        if( m_canvas )
+            m_canvas->Refresh();
+
         return false;
     }
 
@@ -121,8 +129,13 @@ bool SCH_EDIT_FRAME::EditSheet( SCH_SHEET* aSheet, wxDC* aDC )
             msg += _("\n\nDo you want to create a sheet with the contents of this file?" );
 
             if( !IsOK( this, msg ) )
+            {
+                if( m_canvas )
+                    m_canvas->Refresh();
+
                 return false;
             }
+        }
         else                                                   // New file.
         {
             aSheet->SetScreen( new SCH_SCREEN( &Kiway() ) );

include/validators.h

@@ -30,16 +30,16 @@
 #include <wx/valtext.h>
 
 /**
- * Class FOOTPRINT_NAME_VALIDATOR
+ * Class FILE_NAME_CHAR_VALIDATOR
  *
  * This class provides a custom wxValidator object for limiting the allowable characters when
  * defining footprint names.  Since the introduction of the PRETTY footprint library format,
  * footprint names cannot have any characters that would prevent file creation on any platform.
  */
-class FOOTPRINT_NAME_VALIDATOR : public wxTextValidator
+class FILE_NAME_CHAR_VALIDATOR : public wxTextValidator
 {
 public:
-    FOOTPRINT_NAME_VALIDATOR( wxString* aValue = NULL ) :
+    FILE_NAME_CHAR_VALIDATOR( wxString* aValue = NULL ) :
         wxTextValidator( wxFILTER_EXCLUDE_CHAR_LIST, aValue )
     {
         // The Windows (DOS) file system forbidden characters already include the forbidden

pcbnew/dialogs/dialog_edit_module_for_Modedit.cpp

@@ -64,7 +64,7 @@ DIALOG_MODULE_MODULE_EDITOR::DIALOG_MODULE_MODULE_EDITOR( FOOTPRINT_EDIT_FRAME*
     icon.CopyFromBitmap( KiBitmap( icon_modedit_xpm ) );
     SetIcon( icon );
 
-    m_FootprintNameCtrl->SetValidator( FOOTPRINT_NAME_VALIDATOR() );
+    m_FootprintNameCtrl->SetValidator( FILE_NAME_CHAR_VALIDATOR() );
     initModeditProperties();
     m_sdbSizerStdButtonsOK->SetDefault();
     GetSizer()->SetSizeHints( this );

pcbnew/librairi.cpp

@@ -718,7 +718,7 @@ MODULE* PCB_BASE_FRAME::Create_1_Module( const wxString& aModuleName )
     if( moduleName.IsEmpty() )
     {
         wxTextEntryDialog dlg( this, FMT_MOD_REF, FMT_MOD_CREATE, moduleName );
-        dlg.SetTextValidator( FOOTPRINT_NAME_VALIDATOR( &moduleName ) );
+        dlg.SetTextValidator( FILE_NAME_CHAR_VALIDATOR( &moduleName ) );
 
         if( dlg.ShowModal() != wxID_OK )
             return NULL;    //Aborted by user