Extended commit a4e563d, adding double- and triple-clicks for SDL2 an…

…d GL, to SDL1. The logic is almost exactly the same, except that SDL1 lacks SDL_WaitEventTimeout(); fortunately, it was easy to implement that function. See issue #309.

sdl1/pdckbd.c

@@ -95,6 +95,21 @@ bool PDC_check_key(void)
     return haveevent;
 }
 
+int SDL_WaitEventTimeout( SDL_Event *event, int timeout_ms)
+{
+   int rval = 0;
+
+   while( timeout_ms && !rval)
+      {
+      const int slice_ms = (timeout_ms > 20 ? 20 : timeout_ms);
+
+      napms( slice_ms);
+      rval = SDL_PollEvent( event);
+      timeout_ms -= slice_ms;
+      }
+   return( rval);
+}
+
 static int _process_key_event(void)
 {
     int i, key = 0;
@@ -291,14 +306,22 @@ static int _process_mouse_event(void)
         {
             SDL_Event rel;
 
-            napms(SP->mouse_wait);
-
-            if (SDL_PollEvent(&rel))
+            while( action != BUTTON_TRIPLE_CLICKED && SDL_WaitEventTimeout(&rel, SP->mouse_wait))
             {
                 if (rel.type == SDL_MOUSEBUTTONUP && rel.button.button == btn)
-                    action = BUTTON_CLICKED;
-                else
+                {
+                    if( action == BUTTON_PRESSED)
+                        action = BUTTON_CLICKED;
+                    else if( action == BUTTON_CLICKED)
+                        action = BUTTON_DOUBLE_CLICKED;
+                    else if( action == BUTTON_DOUBLE_CLICKED)
+                        action = BUTTON_TRIPLE_CLICKED;
+                }
+                else if(rel.type != SDL_MOUSEBUTTONDOWN || rel.button.button != btn)
+                {
                     SDL_PushEvent(&rel);
+                    break;
+                }
             }
         }