1 files changed, 33 insertions, 13 deletions

diff --git a/nuttx/graphics/nxmu/nxmu_mouse.c b/nuttx/graphics/nxmu/nxmu_mouse.c
index 3ebe062d2..1b8f4a592 100644
--- a/nuttx/graphics/nxmu/nxmu_mouse.c
+++ b/nuttx/graphics/nxmu/nxmu_mouse.c
@@ -61,9 +61,10 @@
  * Private Data
  ****************************************************************************/
 
-static struct nxgl_point_s g_mpos;
-static struct nxgl_point_s g_mrange;
-static uint8_t             g_mbutton;
+static struct nxgl_point_s   g_mpos;
+static struct nxgl_point_s   g_mrange;
+static uint8_t               g_mbutton;
+static struct nxbe_window_s *g_mwnd;
 
 /****************************************************************************
  * Public Data
@@ -129,7 +130,7 @@ int nxmu_mousereport(struct nxbe_window_s *wnd)
           outmsg.buttons = g_mbutton;
           nxgl_vectsubtract(&outmsg.pos, &g_mpos, &wnd->bounds.pt1);
 
-          return nxmu_sendclient(wnd->conn, &outmsg, sizeof(struct nxclimsg_mousein_s));
+          return nxmu_sendclientwindow(wnd, &outmsg, sizeof(struct nxclimsg_mousein_s));
         }
     }
 
@@ -154,6 +155,7 @@ int nxmu_mousein(FAR struct nxfe_state_s *fe,
   struct nxbe_window_s *wnd;
   nxgl_coord_t x = pos->x;
   nxgl_coord_t y = pos->y;
+  uint8_t oldbuttons;
   int ret;
 
   /* Clip x and y to within the bounding rectangle */
@@ -182,20 +184,36 @@ int nxmu_mousein(FAR struct nxfe_state_s *fe,
     {
       /* Update the mouse value */
 
-      g_mpos.x  = x;
-      g_mpos.y  = y;
-      g_mbutton = buttons;
+      oldbuttons = g_mbutton;
+      g_mpos.x   = x;
+      g_mpos.y   = y;
+      g_mbutton  = buttons;
 
-      /* Pick the window to receive the mouse event.  Start with
-       * the top window and go down.  Stop with the first window
-       * that gets the mouse report
+      /* If a button is already down, regard this as part of a mouse drag
+       * event. Pass all the following events to the window where the drag
+       * started in.
+       */
+
+      if (oldbuttons && g_mwnd && g_mwnd->cb->mousein)
+        {
+          struct nxclimsg_mousein_s outmsg;
+          outmsg.msgid   = NX_CLIMSG_MOUSEIN;
+          outmsg.wnd     = g_mwnd;
+          outmsg.buttons = g_mbutton;
+          nxgl_vectsubtract(&outmsg.pos, &g_mpos, &g_mwnd->bounds.pt1);
+
+          return nxmu_sendclientwindow(g_mwnd, &outmsg, sizeof(struct nxclimsg_mousein_s));
+        }
+
+      /* Pick the window to receive the mouse event.  Start with the top
+       * window and go down.  Stop with the first window that gets the mouse
+       * report
        */
 
       for (wnd = fe->be.topwnd; wnd; wnd = wnd->below)
         {
-          /* The background window normally has no callback structure
-           * (unless a client has taken control of the background via
-           * nx_requestbkgd()).
+          /* The background window normally has no callback structure (unless
+           * a client has taken control of the background via nx_requestbkgd()).
            */
 
           if (wnd->cb)
@@ -207,6 +225,8 @@ int nxmu_mousein(FAR struct nxfe_state_s *fe,
                 }
             }
         }
+
+      g_mwnd = wnd;
     }
 
   return OK;