Add fl_focus_rect function to driver.

Focus rectangles are dotted lines. The default implementation uses the dotted line style, However, for systems without line stye, we draw many dots instead.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11110 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/Fl_Device.H

@@ -160,6 +160,7 @@ public:
   // --- implementation is in src/fl_rect.cxx which includes src/drivers/xxx/Fl_xxx_Graphics_Driver_rect.cxx
   virtual void point(int x, int y) = 0;
   virtual void rect(int x, int y, int w, int h) = 0;
+  virtual void focus_rect(int x, int y, int w, int h);
   virtual void rectf(int x, int y, int w, int h) = 0;
   virtual void line(int x, int y, int x1, int y1) = 0;
   virtual void line(int x, int y, int x1, int y1, int x2, int y2) = 0;

FL/fl_draw.H

@@ -200,6 +200,10 @@ enum {
  */
 inline void fl_rect(int x, int y, int w, int h) { fl_graphics_driver->rect(x,y,w,h); }
 
+/**
+ Draw a dotted rectangle, used to indicate keyboard focus on a widget.
+ */
+inline void fl_focus_rect(int x, int y, int w, int h) { fl_graphics_driver->focus_rect(x, y, w, h); }
 /** Draws with passed color a 1-pixel border \e inside the given bounding box */
 inline void fl_rect(int x, int y, int w, int h, Fl_Color c) {fl_color(c); fl_rect(x,y,w,h);}
 /** Colors with current color a rectangle that exactly fills the given bounding box */

src/Fl_Device.cxx

@@ -20,6 +20,7 @@
 #include "config_lib.h"
 #include <FL/Fl_Device.H>
 #include <FL/Fl_Image.H>
+#include <FL/fl_draw.h>
 
 #ifdef FL_CFG_GFX_QUARTZ
 #include "drivers/Quartz/Fl_Quartz_Graphics_Driver.h"
@@ -87,6 +88,13 @@ void Fl_Graphics_Driver::text_extents(const char*t, int n, int& dx, int& dy, int
   dy = descent();
 }
 
+void Fl_Graphics_Driver::focus_rect(int x, int y, int w, int h)
+{
+  line_style(FL_DOT);
+  rect(x, y, w, h);
+  line_style(FL_SOLID);
+}
+
 /**  A constructor that sets the graphics driver used by the display */
 Fl_Display_Device::Fl_Display_Device(Fl_Graphics_Driver *graphics_driver) : Fl_Surface_Device(graphics_driver) {
   this->set_current();

src/Fl_Widget.cxx

@@ -206,37 +206,13 @@ Fl_Widget::draw_focus(Fl_Boxtype B, int X, int Y, int W, int H) const {
     default:
       break;
   }
-
-  fl_color(fl_contrast(FL_BLACK, color()));
-
-#if defined(USE_X11) || defined(__APPLE_QUARTZ__)
-  fl_line_style(FL_DOT);
-  fl_rect(X + Fl::box_dx(B), Y + Fl::box_dy(B),
-          W - Fl::box_dw(B) - 1, H - Fl::box_dh(B) - 1);
-  fl_line_style(FL_SOLID);
-#elif defined(WIN32) 
-  // Windows 95/98/ME do not implement the dotted line style, so draw
-  // every other pixel around the focus area...
-  //
-  // Also, QuickDraw (MacOS) does not support line styles specifically,
-  // and the hack we use in fl_line_style() will not draw horizontal lines
-  // on odd-numbered rows...
-  int i, xx, yy;
-
   X += Fl::box_dx(B);
   Y += Fl::box_dy(B);
-  W -= Fl::box_dw(B) + 2;
-  H -= Fl::box_dh(B) + 2;
+  W -= Fl::box_dw(B)+1;
+  H -= Fl::box_dh(B)+1;
 
-  for (xx = 0, i = 1; xx < W; xx ++, i ++) if (i & 1) fl_point(X + xx, Y);
-  for (yy = 0; yy < H; yy ++, i ++) if (i & 1) fl_point(X + W, Y + yy);
-  for (xx = W; xx > 0; xx --, i ++) if (i & 1) fl_point(X + xx, Y + H);
-  for (yy = H; yy > 0; yy --, i ++) if (i & 1) fl_point(X, Y + yy);
-#elif defined(FL_PORTING)
-# pragma message "handle focus drawing"
-#else
-# error unsupported platform
-#endif // WIN32
+  fl_color(fl_contrast(FL_BLACK, color()));
+  fl_focus_rect(X, Y, W, H);
 }
 
 

src/drivers/GDI/Fl_GDI_Graphics_Driver.h

@@ -69,6 +69,7 @@ protected:
   // --- implementation is in src/fl_rect.cxx which includes src/cfg_gfx/gdi_rect.cxx
   void point(int x, int y);
   void rect(int x, int y, int w, int h);
+  void focus_rect(int x, int y, int w, int h);
   void rectf(int x, int y, int w, int h);
   void line(int x, int y, int x1, int y1);
   void line(int x, int y, int x1, int y1, int x2, int y2);

src/drivers/GDI/Fl_GDI_Graphics_Driver_rect.cxx

@@ -48,6 +48,17 @@ void Fl_GDI_Graphics_Driver::rect(int x, int y, int w, int h) {
   LineTo(fl_gc, x, y);
 }
 
+void Fl_GDI_Graphics_Driver::focus_rect(int x, int y, int w, int h) {
+  // Windows 95/98/ME do not implement the dotted line style, so draw
+  // every other pixel around the focus area...
+  w--; h--;
+  int i=1, xx, yy;
+  for (xx = 0; xx < w; xx++, i++) if (i & 1) point(x + xx, y);
+  for (yy = 0; yy < h; yy++, i++) if (i & 1) point(x + w, y + yy);
+  for (xx = w; xx > 0; xx--, i++) if (i & 1) point(x + xx, y + h);
+  for (yy = h; yy > 0; yy--, i++) if (i & 1) point(x, y + yy);
+}
+
 void Fl_GDI_Graphics_Driver::rectf(int x, int y, int w, int h) {
   if (w<=0 || h<=0) return;
   RECT rect;