draw only in OnPaint

change_log.txt

@@ -5,6 +5,13 @@ Started 2007-June-11
 Please add newer entries at the top, list the date and your name with
 email address.
 
+2008-Mar-31 UPDATE   Dick Hollenbeck <dick@softplc.com>
+================================================================================
++all
+    Tweaked class MsgPanel so that the screen drawing only happens from
+    its OnPaint() function.
+
+
 2008-Mar-30 UPDATE  Jean-Pierre Charras <jean-pierre.charras@inpg.fr>
 ================================================================================
 +eeschema
@@ -16,7 +23,6 @@ email address.
     Added comments in gestfich.cpp to explain the default paths used by kicad to find help files and lib files
 
 
-
 2008-Mar-30 UPDATE  Jonas Diemer <diemer-at-gmx.de>
 ================================================================================
 +eeschema

common/msgpanel.cpp

@@ -29,12 +29,12 @@ WinEDA_MsgPanel::WinEDA_MsgPanel( WinEDA_DrawFrame* parent, int id,
 {
     m_Parent = parent;
     SetFont( *g_MsgFont );
+    m_last_x = 0;
 }
 
 
 WinEDA_MsgPanel::~WinEDA_MsgPanel()
 {
-    m_Items.clear();
 }
 
 
@@ -44,7 +44,7 @@ void WinEDA_MsgPanel::OnPaint( wxPaintEvent& event )
 {
     wxPaintDC dc( this );
 
-    //EraseMsgBox( &dc );
+    erase( &dc );
 
     dc.SetBackground( *wxBLACK_BRUSH );
     dc.SetBackgroundMode( wxSOLID );
@@ -77,36 +77,33 @@ void WinEDA_MsgPanel::Affiche_1_Parametre( int pos_X, const wxString& texte_H,
  *  color = couleur d'affichage
  */
 {
-    static int old_pos_X;
     wxPoint     pos;
-    wxSize     FontSizeInPixels, DrawSize;
-
-    wxClientDC dc( this );
+    wxSize      drawSize = GetClientSize();
 
-    DrawSize = GetClientSize();
 
-    dc.SetBackground( *wxBLACK_BRUSH );
-    dc.SetBackgroundMode( wxSOLID );
-
-    dc.SetTextBackground( GetBackgroundColour() );
+    // Get size of the font
+    wxSize      fontSizeInPixels;
+    {
+        wxClientDC dc( this );
 
         dc.SetFont( *g_MsgFont );
-    dc.GetTextExtent( wxT( "W" ), &FontSizeInPixels.x, &FontSizeInPixels.y );
+        dc.GetTextExtent( wxT( "W" ), &fontSizeInPixels.x, &fontSizeInPixels.y );
 
+    }   // destroy wxClientDC ASAP
 
     if( pos_X >= 0 )
     {
-        old_pos_X = pos.x = pos_X * (FontSizeInPixels.x + 2);
+        m_last_x = pos.x = pos_X * (fontSizeInPixels.x + 2);
     }
     else
-        pos.x = old_pos_X;
+        pos.x = m_last_x;
 
     MsgItem item;
 
     item.m_X = pos.x;
 
-    item.m_UpperY = (DrawSize.y / 2) - FontSizeInPixels.y;
-    item.m_LowerY = DrawSize.y - FontSizeInPixels.y;
+    item.m_UpperY = (drawSize.y / 2) - fontSizeInPixels.y;
+    item.m_LowerY = drawSize.y - fontSizeInPixels.y;
 
     item.m_UpperText = texte_H;
     item.m_LowerText = texte_L;
@@ -137,7 +134,7 @@ void WinEDA_MsgPanel::Affiche_1_Parametre( int pos_X, const wxString& texte_H,
         m_Items.push_back( item );
     }
 
-    showItem( dc, item );
+    Refresh();
 }
 
 
@@ -168,29 +165,25 @@ void WinEDA_MsgPanel::showItem( wxDC& dc, const MsgItem& aItem )
 /****************************************/
 void WinEDA_MsgPanel::EraseMsgBox()
 /****************************************/
-
-/* Effacement de la fenetre d'affichage des messages de bas d'ecran
- */
 {
-    wxClientDC dc( this );
-
-    EraseMsgBox( &dc );
+   m_Items.clear();
+   m_last_x = 0;
+   Refresh();
 }
 
 
 /*******************************************/
-void WinEDA_MsgPanel::EraseMsgBox( wxDC* DC )
+void WinEDA_MsgPanel::erase( wxDC* DC )
 /*******************************************/
 {
-    wxSize  size;
-    wxColor color;
     wxPen   pen;
     wxBrush brush;
 
-    size  = GetClientSize();
-    color = GetBackgroundColour();
+    wxSize  size  = GetClientSize();
+    wxColor color = GetBackgroundColour();
 
     pen.SetColour( color );
+
     brush.SetColour( color );
     brush.SetStyle( wxSOLID );
 
@@ -198,9 +191,8 @@ void WinEDA_MsgPanel::EraseMsgBox( wxDC* DC )
     DC->SetBrush( brush );
 
     DC->DrawRectangle( 0, 0, size.x, size.y );
+
     DC->SetBrush( wxNullBrush );
     DC->SetPen( wxNullPen );
-    
-    m_Items.clear();
 }
 

include/wxstruct.h

@@ -192,6 +192,8 @@ public:
 
 class WinEDA_DrawFrame : public WinEDA_BasicFrame
 {
+
+
 public:
     WinEDA_DrawPanel* DrawPanel;            // Draw area
     WinEDA_MsgPanel*  MsgPanel;             // Zone d'affichage de caracteristiques
@@ -541,9 +543,13 @@ class WinEDA_MsgPanel : public wxPanel
 {
 protected:
     std::vector<MsgItem>    m_Items;
+    int                     m_last_x;       ///< the last used x coordinate
+
 
     void    showItem( wxDC& dc, const MsgItem& aItem );
 
+    void    erase( wxDC* DC );
+
 public:
     WinEDA_DrawFrame* m_Parent;
     int m_BgColor;          // couleur de fond
@@ -556,7 +562,6 @@ public:
 
     void    OnPaint( wxPaintEvent& event );
     void    EraseMsgBox();
-    void    EraseMsgBox( wxDC* DC );
     void    Affiche_1_Parametre( int pos_X, const wxString& texte_H,
                                  const wxString& texte_L, int color );