From 629e37b7ed07a616733214c3df603664c48480d2 Mon Sep 17 00:00:00 2001
From: Szymon Wilczek <kazeuser@gmail.com>
Date: Thu, 3 Jul 2008 22:03:58 +0000
Subject: [PATCH] Relative mode for tablets. Info on wiki.

---
 include/SDL_mouse.h           |  2 +-
 src/events/SDL_mouse.c        | 82 +++++++++++++++++++++++++++--------
 src/events/SDL_mouse_c.h      |  3 +-
 src/video/x11/SDL_x11events.c | 10 ++++-
 src/video/x11/SDL_x11video.c  |  5 +++
 5 files changed, 81 insertions(+), 21 deletions(-)

diff --git a/include/SDL_mouse.h b/include/SDL_mouse.h
index b777717ef..1aa803b37 100644
--- a/include/SDL_mouse.h
+++ b/include/SDL_mouse.h
@@ -92,7 +92,7 @@ extern DECLSPEC SDL_WindowID SDLCALL SDL_GetMouseFocusWindow(void);
  *
  * \sa SDL_GetRelativeMouseMode()
  */
-extern DECLSPEC int SDLCALL SDL_SetRelativeMouseMode(SDL_bool enabled);
+extern DECLSPEC int SDLCALL SDL_SetRelativeMouseMode(SDL_bool enabled, int index);
 
 /**
  * \fn SDL_bool SDL_GetRelativeMouseMode()
diff --git a/src/events/SDL_mouse.c b/src/events/SDL_mouse.c
index 89a1dee51..99bc6bcc2 100644
--- a/src/events/SDL_mouse.c
+++ b/src/events/SDL_mouse.c
@@ -33,8 +33,8 @@ static int SDL_current_mouse;
 static SDL_Mouse **SDL_mice;
 int *SDL_IdIndex;
 int SDL_highestId;
-
-
+int last_x, last_y;
+int x_max, y_max;
 /* Public functions */
 int
 SDL_MouseInit(void)
@@ -85,6 +85,8 @@ SDL_AddMouse(const SDL_Mouse * mouse, int index, char* name)
         SDL_CreateCursor(default_cdata, default_cmask, DEFAULT_CWIDTH,
                          DEFAULT_CHEIGHT, DEFAULT_CHOTX, DEFAULT_CHOTY);
     SDL_SetCursor(SDL_mice[index]->def_cursor);
+    SDL_mice[index]->proximity=SDL_TRUE;
+    SDL_mice[index]->relative_mode=SDL_FALSE;
     SDL_SelectMouse(selected_mouse);
 
     return index;
@@ -180,9 +182,9 @@ FlushMouseMotion(void *param, SDL_Event * event)
 }
 
 int
-SDL_SetRelativeMouseMode(SDL_bool enabled)
+SDL_SetRelativeMouseMode(SDL_bool enabled, int index)
 {
-    SDL_Mouse *mouse = SDL_GetMouse(SDL_current_mouse);
+    SDL_Mouse *mouse = SDL_GetMouse(index);
 
     if (!mouse) {
         return -1;
@@ -326,12 +328,20 @@ SDL_SendProximity(int id, int x, int y, int type)
     if(SDL_ProcessEvents[type]==SDL_ENABLE)
     {
         SDL_Event event;
-        event.proximity.which=index;
+        event.proximity.which=(Uint8)index;
         event.proximity.x=x;
         event.proximity.y=y;
         event.type=type;
         event.proximity.type=type;
         posted = (SDL_PushEvent(&event) > 0);
+        if(type==SDL_PROXIMITYIN)
+        {
+            SDL_mice[index]->proximity=SDL_TRUE;
+        }
+        else
+        {
+            SDL_mice[index]->proximity=SDL_FALSE;
+        }
     }
     return posted;
 }
@@ -348,16 +358,21 @@ SDL_SendMouseMotion(int id, int relative, int x, int y,int z)
     if (!mouse || mouse->flush_motion) {
         return 0;
     }
-
-    if (relative) {
+    if(mouse->proximity==SDL_FALSE)
+    {
+        last_x=x;
+        last_y=y;
+        return 0;
+    }
+    if (mouse->relative_mode==SDL_TRUE && mouse->proximity==SDL_TRUE) {
         /* Push the cursor around */
-        xrel = x;
-        yrel = y;
-        x = (mouse->x + xrel);
-        y = (mouse->y + yrel);
+        xrel = x - last_x;
+        yrel = y - last_y;
+        //x = (mouse->x + xrel);
+        //y = (mouse->y + yrel);
     } else {
-        xrel = x - mouse->x;
-        yrel = y - mouse->y;
+        xrel = x - last_x;
+        yrel = y - last_y;
     }
 
     /* Drop events that don't change state */
@@ -369,10 +384,37 @@ SDL_SendMouseMotion(int id, int relative, int x, int y,int z)
     }
 
     /* Update internal mouse state */
-    if (!mouse->relative_mode) {
+    if (mouse->relative_mode==SDL_FALSE) {
         mouse->x = x;
         mouse->y = y;
     }
+    else
+    {
+        if(mouse->x+xrel>x_max)
+        {
+            mouse->x=x_max;
+        }
+        else if(mouse->x+xrel<0)
+        {
+            mouse->x=0;
+        }
+        else
+        {
+            mouse->x+=xrel;
+        }
+        if(mouse->y+yrel>y_max)
+        {
+            mouse->y=y_max;
+        }
+        else if(mouse->y+yrel<0)
+        {
+            mouse->y=0;
+        }
+        else
+        {
+            mouse->y+=yrel;
+        }
+    }
     mouse->xdelta += xrel;
     mouse->ydelta += yrel;
     mouse->z=z;
@@ -385,10 +427,10 @@ SDL_SendMouseMotion(int id, int relative, int x, int y,int z)
 
     /* Post the event, if desired */
     posted = 0;
-    if (SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE) {
+    if (SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE && SDL_mice[index]->proximity==SDL_TRUE) {
         SDL_Event event;
         event.motion.type = SDL_MOUSEMOTION;
-        event.motion.which = (Uint8) index;
+event.motion.which = (Uint8) index;
         event.motion.state = mouse->buttonstate;
         event.motion.x = mouse->x;
         event.motion.y = mouse->y;
@@ -398,6 +440,8 @@ SDL_SendMouseMotion(int id, int relative, int x, int y,int z)
         event.motion.windowID = mouse->focus;
         posted = (SDL_PushEvent(&event) > 0);
     }
+    last_x=x;
+    last_y=y;
     return posted;
 }
 
@@ -724,5 +768,9 @@ char* SDL_GetMouseName(int index)
     return mouse->name;
 }
 
-
+void SDL_UpdateCoordinates(int x, int y)
+{
+    x_max=x;
+    y_max=y;
+}
 /* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/events/SDL_mouse_c.h b/src/events/SDL_mouse_c.h
index 3346bf52b..0569099ec 100644
--- a/src/events/SDL_mouse_c.h
+++ b/src/events/SDL_mouse_c.h
@@ -67,6 +67,7 @@ struct SDL_Mouse
     char* name;
     Uint8 buttonstate;
     SDL_bool relative_mode;
+    SDL_bool proximity;
     SDL_bool flush_motion;
 
     SDL_Cursor *cursors;
@@ -118,7 +119,7 @@ extern int SDL_GetNumOfMice(void);
 
 extern char* SDL_GetMouseName(int index);
 
-
+extern void SDL_UpdateCoordinates(int x, int y);
 
 #endif /* _SDL_mouse_c_h */
 
diff --git a/src/video/x11/SDL_x11events.c b/src/video/x11/SDL_x11events.c
index 29fde2c79..f5a2433c1 100644
--- a/src/video/x11/SDL_x11events.c
+++ b/src/video/x11/SDL_x11events.c
@@ -37,6 +37,7 @@ extern int button_pressed;
 extern int button_released;
 extern int proximity_in;
 extern int proximity_out;
+extern int x_max,y_max;
 
 
 static void
@@ -126,8 +127,8 @@ X11_DispatchEvent(_THIS)
                 (xevent.xcrossing.mode != NotifyUngrab) &&
                 (xevent.xcrossing.detail != NotifyInferior)) {
 			    XDeviceMotionEvent* move=(XDeviceMotionEvent*)&xevent;
-                SDL_SendMouseMotion(move->deviceid, 0,
-                                    move->x, move->y,move->axis_data[2]);
+                //SDL_SendMouseMotion(move->deviceid, 0,
+                //                    move->x, move->y,move->axis_data[2]);
                 SDL_SetMouseFocus(move->deviceid, 0);
             }
         }
@@ -297,6 +298,11 @@ X11_DispatchEvent(_THIS)
 #ifdef DEBUG_MOTION
                 printf("X11 motion: %d,%d\n", xevent.xmotion.x, xevent.xmotion.y);
 #endif
+                XWindowAttributes attrib;
+                XGetWindowAttributes(videodata->display, ((XAnyEvent*)&xevent)->window, &attrib);
+                /*x_max=attrib.width;
+                y_max=attrib.height;*/
+                SDL_UpdateCoordinates(attrib.width, attrib.height);
 			    XDeviceMotionEvent* move=(XDeviceMotionEvent*)&xevent;
                 SDL_SendMouseMotion(move->deviceid, 0, move->x,
                                 move->y,move->axis_data[2]);
diff --git a/src/video/x11/SDL_x11video.c b/src/video/x11/SDL_x11video.c
index 35347a3ef..ee8abb7f9 100644
--- a/src/video/x11/SDL_x11video.c
+++ b/src/video/x11/SDL_x11video.c
@@ -362,4 +362,9 @@ X11_VideoQuit(_THIS)
     free(SDL_XDevices);
 }
 
+/*void X11_ForwardWindowCoordinates(int x, int y)
+{
+    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
+}*/
+
 /* vim: set ts=4 sw=4 expandtab: */