adjust editor-cavas% refresh to clear border before calling on-paint

svn: r12198

collects/mred/private/kernel.ss

@@ -728,6 +728,7 @@
     set-x-margin
     get-y-margin
     get-x-margin
+    clear-margins
     scroll-to
     set-lazy-refresh
     get-lazy-refresh

collects/mred/private/wxcanvas.ss

@@ -14,12 +14,17 @@
 
   (define (make-canvas-glue% %) ; implies make-window-glue%
     (class100 (make-window-glue% %) (mred proxy . args)
-      (inherit get-mred get-top-level)
+      (inherit get-mred get-top-level clear-margins)
       (public
 	[do-on-char (lambda (e) (super on-char e))]
 	[do-on-event (lambda (e) (super on-event e))]
 	[do-on-scroll (lambda (e) (super on-scroll e))]
 	[do-on-paint (lambda () (super on-paint))])
+      (private
+        [clear-and-on-paint
+         (lambda (mred)
+           (clear-margins)
+           (send mred on-paint))])
       (override
 	[on-char (entry-point
 		  (lambda (e)
@@ -54,9 +59,9 @@
 			       ;; Windows circumvented the event queue; delay
 			       (queue-window-callback
 				this
-				(lambda () (send mred on-paint)))
+				(lambda () (clear-and-on-paint mred)))
-			       (as-exit (lambda () (send mred on-paint))))
+			       (as-exit (lambda () (clear-and-on-paint mred))))
-			   (as-exit (lambda () (super on-paint)))))))])
+			   (as-exit (lambda () (clear-margins) (super on-paint)))))))])
       (sequence (apply super-init mred proxy args))))
 
   (define wx-canvas% 
@@ -66,6 +71,7 @@
        (private-field
 	[tabable? #f])
        (public
+         [clear-margins (lambda () (void))]
 	 [on-tab-in (lambda () (send (wx->mred this) on-tab-in))]
 	 [get-tab-focus (lambda () tabable?)]
 	 [set-tab-focus (lambda (v) (set! tabable? v))])

collects/scribblings/gui/editor-canvas-class.scrbl

@@ -235,7 +235,15 @@ Enables or disables the caret in the @techlink{display}'s editor, if
            (on-paint)
            void?]{
 
-Repaints the editor.
+Repaints the editor, or clears the canvas if no editor is being
+displayed.
+
+This method is called after clearing the margin around the editor,
+unless the canvas is created with the @scheme['transparent] style, but
+the editor area is not automatically cleared. In other words,
+@scheme[editor-canvas%] update by default is like @scheme[canvas%]
+update with the @scheme['no-autoclear] style, except that the margin
+around the editor area is always cleared.
 
 }
 

src/mred/wxme/wx_medad.cxx

@@ -671,12 +671,13 @@ void wxMediaCanvas::OnChar(wxKeyEvent *event)
   }
 }
 
-void wxMediaCanvas::OnPaint(void)
+void wxMediaCanvas::ClearMargins(void)
 {
-  need_refresh = FALSE;
+  /* This method is called by `on-paint' in `wx:canvas%'
+     before it calls the `on-paint' in `canvas%'. It's
+     essentially a compromise between autoclear mode and
+     no-autoclear mode. */
 
-  if (media) {
-    /* Clear the margins */
   if (xmargin || ymargin) {
     wxDC *adc;
     wxColor *bg;
@@ -706,7 +707,13 @@ void wxMediaCanvas::OnPaint(void)
       adc->SetPen(op);
     }
   }
+}
 
+void wxMediaCanvas::OnPaint(void)
+{
+  need_refresh = FALSE;
+
+  if (media) {  
     if (!media->printing) {
       double w, h, x, y;
       GetView(&x, &y, &w, &h);

src/mred/wxme/wx_medad.h

@@ -455,6 +455,8 @@ class wxMediaCanvas : public wxCanvas
 
   virtual void Scroll(int x, int y, Bool refresh);
 
+  void ClearMargins();
+
   /* To block bad uses: */
   virtual void Scroll(int x, int y);
   virtual void SetScrollbars(int h_pixels, int v_pixels, int x_len, int y_len,

src/mred/wxs/wxs_madm.cxx

@@ -241,6 +241,7 @@ typedef void *(*CAPOFunc)(void*);
 
 
 
+
 
 class os_wxMediaCanvas : public wxMediaCanvas {
  public:
@@ -1114,6 +1115,26 @@ static Scheme_Object *os_wxMediaCanvasGetXMargin(int n,  Scheme_Object *p[])
   return scheme_make_integer(r);
 }
 
+static Scheme_Object *os_wxMediaCanvasClearMargins(int n,  Scheme_Object *p[])
+{
+  WXS_USE_ARGUMENT(n) WXS_USE_ARGUMENT(p)
+  REMEMBER_VAR_STACK();
+  objscheme_check_valid(os_wxMediaCanvas_class, "clear-margins in editor-canvas%", n, p);
+
+  SETUP_VAR_STACK_REMEMBERED(1);
+  VAR_STACK_PUSH(0, p);
+
+  
+
+  
+  WITH_VAR_STACK(((wxMediaCanvas *)((Scheme_Class_Object *)p[0])->primdata)->ClearMargins());
+
+  
+  
+  READY_TO_RETURN;
+  return scheme_void;
+}
+
 static Scheme_Object *os_wxMediaCanvasScrollTo(int n,  Scheme_Object *p[])
 {
   WXS_USE_ARGUMENT(n) WXS_USE_ARGUMENT(p)
@@ -1474,7 +1495,7 @@ void objscheme_setup_wxMediaCanvas(Scheme_Env *env)
 
   wxREGGLOB(os_wxMediaCanvas_class);
 
-  os_wxMediaCanvas_class = WITH_VAR_STACK(objscheme_def_prim_class(env, "editor-canvas%", "canvas%", (Scheme_Method_Prim *)os_wxMediaCanvas_ConstructScheme, 29));
+  os_wxMediaCanvas_class = WITH_VAR_STACK(objscheme_def_prim_class(env, "editor-canvas%", "canvas%", (Scheme_Method_Prim *)os_wxMediaCanvas_ConstructScheme, 30));
 
   WITH_VAR_STACK(scheme_add_method_w_arity(os_wxMediaCanvas_class, "on-char" " method", (Scheme_Method_Prim *)os_wxMediaCanvasOnChar, 1, 1));
   WITH_VAR_STACK(scheme_add_method_w_arity(os_wxMediaCanvas_class, "on-event" " method", (Scheme_Method_Prim *)os_wxMediaCanvasOnEvent, 1, 1));
@@ -1493,6 +1514,7 @@ void objscheme_setup_wxMediaCanvas(Scheme_Env *env)
   WITH_VAR_STACK(scheme_add_method_w_arity(os_wxMediaCanvas_class, "set-x-margin" " method", (Scheme_Method_Prim *)os_wxMediaCanvasSetXMargin, 1, 1));
   WITH_VAR_STACK(scheme_add_method_w_arity(os_wxMediaCanvas_class, "get-y-margin" " method", (Scheme_Method_Prim *)os_wxMediaCanvasGetYMargin, 0, 0));
   WITH_VAR_STACK(scheme_add_method_w_arity(os_wxMediaCanvas_class, "get-x-margin" " method", (Scheme_Method_Prim *)os_wxMediaCanvasGetXMargin, 0, 0));
+  WITH_VAR_STACK(scheme_add_method_w_arity(os_wxMediaCanvas_class, "clear-margins" " method", (Scheme_Method_Prim *)os_wxMediaCanvasClearMargins, 0, 0));
   WITH_VAR_STACK(scheme_add_method_w_arity(os_wxMediaCanvas_class, "scroll-to" " method", (Scheme_Method_Prim *)os_wxMediaCanvasScrollTo, 5, 6));
   WITH_VAR_STACK(scheme_add_method_w_arity(os_wxMediaCanvas_class, "set-lazy-refresh" " method", (Scheme_Method_Prim *)os_wxMediaCanvasSetLazyRefresh, 1, 1));
   WITH_VAR_STACK(scheme_add_method_w_arity(os_wxMediaCanvas_class, "get-lazy-refresh" " method", (Scheme_Method_Prim *)os_wxMediaCanvasGetLazyRefresh, 0, 0));

src/mred/wxs/wxs_madm.xc

@@ -88,6 +88,8 @@ typedef void *(*CAPOFunc)(void*);
 
 @ "scroll-to" : bool ScrollTo(double,double,nndouble,nndouble, bool,SYM[bias]=0); : : : rFALSE
 
+@ "clear-margins" : void ClearMargins();
+
 @ "get-x-margin" : nnint GetXMargin();
 @ "get-y-margin" : nnint GetYMargin();
 @ "set-x-margin" : void SetXMargin(nnint);