Patch to provide extra cues to the user when using window menu move and

2002-08-08  Craig Black  <blackc@speakeasy.net>

  Patch to provide extra cues to the user when using
  window menu move and resize, #85724.

  * src/common.h: add new cursors

  * src/display.c: (grab_op_is_mouse)
  (meta_display_create_x_cursor), (xcursor_for_op),
  (meta_display_set_grab_op_cursor),
  (meta_display_begin_grab_op):
  The keyboard move and resize grab ops now also use the mouse.
  Allow the grab cursor to be changed during the grab op.
  Hold onto the initial grab position in case of reset.

  * src/display.h: save the initial grab position

  * src/keybindings.c: (process_keyboard_move_grab),
  (process_keyboard_resize_grab), (handle_begin_move),
  (handle_begin_resize):
  The keyboard move and resize grab ops now also use the mouse.

  * src/window.c: (meta_window_client_message), (menu_callback),
  (update_move), (update_resize),
  (meta_window_handle_mouse_grab_op_event), (warp_pointer),
  (meta_window_warp_pointer), (meta_window_begin_grab_op),
  (meta_window_update_resize_grab_op):
  When moving or resizing a window use the last grab position
  in computing change increment.
  Provide support for warping the mouse pointer.

  * src/window.h: new warp pointer and grab op helper functions

ChangeLog

@@ -1,3 +1,36 @@
+2002-08-08  Craig Black  <blackc@speakeasy.net>
+
+	Patch to provide extra cues when using the window menu 
+	move and resize items, #85724.
+
+	* src/common.h: add new cursors
+
+	* src/display.c: (grab_op_is_mouse)
+	(meta_display_create_x_cursor), (xcursor_for_op),
+	(meta_display_set_grab_op_cursor), 
+	(meta_display_begin_grab_op):
+	The keyboard move and resize grab ops now also use the mouse. 
+	Allow the grab cursor to be changed during the grab op.
+	Hold onto the initial grab position in case of reset.
+
+	* src/display.h: save the initial grab position
+
+	* src/keybindings.c: (process_keyboard_move_grab),
+	(process_keyboard_resize_grab), (handle_begin_move),
+	(handle_begin_resize):
+	The keyboard move and resize grab ops now also use the mouse. 
+
+	* src/window.c: (meta_window_client_message), (menu_callback),
+	(update_move), (update_resize),
+	(meta_window_handle_mouse_grab_op_event), (warp_pointer),
+	(meta_window_warp_pointer), (meta_window_begin_grab_op),
+	(meta_window_update_resize_grab_op):
+	When moving or resizing a window use the last grab position
+	in computing change increment.
+	Provide support for warping the mouse pointer.
+
+	* src/window.h: new warp pointer and grab op helper functions
+
 2002-08-08  Craig Black  <blackc@speakeasy.net>
 
 	* src/display.h: update comment

src/common.h

@@ -128,7 +128,9 @@ typedef enum
   META_CURSOR_SE_RESIZE,
   META_CURSOR_SW_RESIZE,
   META_CURSOR_NE_RESIZE,
-  META_CURSOR_NW_RESIZE
+  META_CURSOR_NW_RESIZE,
+  META_CURSOR_MOVE_WINDOW,
+  META_CURSOR_RESIZE_WINDOW
 
 } MetaCursor;
 

src/display.c

@@ -803,6 +803,16 @@ grab_op_is_mouse (MetaGrabOp op)
     case META_GRAB_OP_RESIZING_NW:
     case META_GRAB_OP_RESIZING_W:
     case META_GRAB_OP_RESIZING_E:
+    case META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN:
+    case META_GRAB_OP_KEYBOARD_RESIZING_S:
+    case META_GRAB_OP_KEYBOARD_RESIZING_N:
+    case META_GRAB_OP_KEYBOARD_RESIZING_W:
+    case META_GRAB_OP_KEYBOARD_RESIZING_E:
+    case META_GRAB_OP_KEYBOARD_RESIZING_SE:
+    case META_GRAB_OP_KEYBOARD_RESIZING_NE:
+    case META_GRAB_OP_KEYBOARD_RESIZING_SW:
+    case META_GRAB_OP_KEYBOARD_RESIZING_NW:
+    case META_GRAB_OP_KEYBOARD_MOVING:
       return TRUE;
       break;
 
@@ -2180,6 +2190,12 @@ meta_display_create_x_cursor (MetaDisplay *display,
     case META_CURSOR_NW_RESIZE:
       glyph = XC_top_left_corner;
       break;
+    case META_CURSOR_MOVE_WINDOW:
+      glyph = XC_plus;
+      break;
+    case META_CURSOR_RESIZE_WINDOW:
+      glyph = XC_fleur;
+      break;
 
     default:
       g_assert_not_reached ();
@@ -2201,29 +2217,43 @@ xcursor_for_op (MetaDisplay *display,
   switch (op)
     {
     case META_GRAB_OP_RESIZING_SE:
+    case META_GRAB_OP_KEYBOARD_RESIZING_SE:
       cursor = META_CURSOR_SE_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_S:
+    case META_GRAB_OP_KEYBOARD_RESIZING_S:
       cursor = META_CURSOR_SOUTH_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_SW:
+    case META_GRAB_OP_KEYBOARD_RESIZING_SW:
       cursor = META_CURSOR_SW_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_N:
+    case META_GRAB_OP_KEYBOARD_RESIZING_N:
       cursor = META_CURSOR_NORTH_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_NE:
+    case META_GRAB_OP_KEYBOARD_RESIZING_NE:
       cursor = META_CURSOR_NE_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_NW:
+    case META_GRAB_OP_KEYBOARD_RESIZING_NW:
       cursor = META_CURSOR_NW_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_W:
+    case META_GRAB_OP_KEYBOARD_RESIZING_W:
       cursor = META_CURSOR_WEST_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_E:
+    case META_GRAB_OP_KEYBOARD_RESIZING_E:
       cursor = META_CURSOR_EAST_RESIZE;
       break;
+    case META_GRAB_OP_KEYBOARD_MOVING:
+      cursor = META_CURSOR_MOVE_WINDOW;
+      break;
+    case META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN:
+      cursor = META_CURSOR_RESIZE_WINDOW;
+      break;
       
     default:
       break;
@@ -2232,6 +2262,61 @@ xcursor_for_op (MetaDisplay *display,
   return meta_display_create_x_cursor (display, cursor);
 }
 
+void
+meta_display_set_grab_op_cursor (MetaDisplay *display,
+                                 MetaGrabOp   op,
+                                 gboolean     change_pointer,
+                                 Window       grab_xwindow,
+                                 Time         timestamp)
+{
+  Cursor cursor;
+
+  cursor = xcursor_for_op (display, op);
+
+#define GRAB_MASK (PointerMotionMask | PointerMotionHintMask |  \
+                   ButtonPressMask | ButtonReleaseMask)
+
+  meta_error_trap_push (display);
+
+  if (change_pointer)
+    {
+      XChangeActivePointerGrab (display->xdisplay,
+                                GRAB_MASK,
+                                cursor,
+                                timestamp);
+
+      meta_topic (META_DEBUG_WINDOW_OPS,
+                  "Changed pointer with XChangeActivePointerGrab()\n");
+    }
+  else
+    {
+      if (XGrabPointer (display->xdisplay,
+                        grab_xwindow,
+                        False,
+                        GRAB_MASK,
+                        GrabModeAsync, GrabModeAsync,
+                        None,
+                        cursor,
+                        timestamp) == GrabSuccess)
+        {
+          display->grab_have_pointer = TRUE;
+          meta_topic (META_DEBUG_WINDOW_OPS,
+                      "XGrabPointer() returned GrabSuccess\n");
+        }
+    }  
+
+  if (meta_error_trap_pop (display) != Success)
+    {
+      meta_topic (META_DEBUG_WINDOW_OPS,
+                  "Error trapped from XGrabPointer()\n");
+      if (display->grab_have_pointer)
+        display->grab_have_pointer = FALSE;
+    }
+#undef GRAB_MASK
+  
+  XFreeCursor (display->xdisplay, cursor);
+}
+
 gboolean
 meta_display_begin_grab_op (MetaDisplay *display,
 			    MetaScreen  *screen,
@@ -2245,7 +2330,6 @@ meta_display_begin_grab_op (MetaDisplay *display,
                             int          root_y)
 {
   Window grab_xwindow;
-  Cursor cursor;
   
   meta_topic (META_DEBUG_WINDOW_OPS,
               "Doing grab op %d on window %s button %d pointer already grabbed: %d\n",
@@ -2273,35 +2357,7 @@ meta_display_begin_grab_op (MetaDisplay *display,
   if (pointer_already_grabbed)
     display->grab_have_pointer = TRUE;
       
-  cursor = xcursor_for_op (display, op);
+  meta_display_set_grab_op_cursor (display, op, FALSE, grab_xwindow, timestamp);
-
-#define GRAB_MASK (PointerMotionMask | PointerMotionHintMask |  \
-                   ButtonPressMask | ButtonReleaseMask)
-
-  meta_error_trap_push (display);
-  if (XGrabPointer (display->xdisplay,
-                    grab_xwindow,
-                    False,
-                    GRAB_MASK,
-                    GrabModeAsync, GrabModeAsync,
-                    None,
-                    cursor,
-                    timestamp) == GrabSuccess)
-    {
-      display->grab_have_pointer = TRUE;
-      meta_topic (META_DEBUG_WINDOW_OPS,
-                  "XGrabPointer() returned GrabSuccess\n");
-    }
-  if (meta_error_trap_pop (display) != Success)
-    {
-      meta_topic (META_DEBUG_WINDOW_OPS,
-                  "Error trapped from XGrabPointer()\n");
-      if (display->grab_have_pointer)
-        display->grab_have_pointer = FALSE;
-    }
-#undef GRAB_MASK
-  
-  XFreeCursor (display->xdisplay, cursor);
 
   if (!display->grab_have_pointer)
     {
@@ -2336,14 +2392,17 @@ meta_display_begin_grab_op (MetaDisplay *display,
   display->grab_xwindow = grab_xwindow;
   display->grab_button = button;
   display->grab_mask = modmask;
-  display->grab_root_x = root_x;
+  display->grab_initial_root_x = root_x;
-  display->grab_root_y = root_y;
+  display->grab_initial_root_y = root_y;
+  display->grab_current_root_x = root_x;
+  display->grab_current_root_y = root_y;
   if (display->grab_window)
     {
       display->grab_initial_window_pos = display->grab_window->rect;
       meta_window_get_position (display->grab_window,
                                 &display->grab_initial_window_pos.x,
                                 &display->grab_initial_window_pos.y);
+      display->grab_current_window_pos = display->grab_initial_window_pos;
     }
   
   meta_topic (META_DEBUG_WINDOW_OPS,

src/display.h

@@ -209,12 +209,15 @@ struct _MetaDisplay
   MetaWindow *grab_window;
   Window      grab_xwindow;
   int         grab_button;
-  int         grab_root_x;
+  int         grab_initial_root_x;
-  int         grab_root_y;
+  int         grab_initial_root_y;
+  int         grab_current_root_x;
+  int         grab_current_root_y;
   gulong      grab_mask;
   guint       grab_have_pointer : 1;
   guint       grab_have_keyboard : 1;
   MetaRectangle grab_initial_window_pos;
+  MetaRectangle grab_current_window_pos;
   MetaResizePopup *grab_resize_popup;
 
 
@@ -285,6 +288,12 @@ MetaWorkspace* meta_display_get_workspace_by_screen_index (MetaDisplay   *displa
 Cursor         meta_display_create_x_cursor (MetaDisplay *display,
                                              MetaCursor   cursor);
 
+void     meta_display_set_grab_op_cursor (MetaDisplay *display,
+                                          MetaGrabOp   op,
+                                          gboolean     change_pointer,
+                                          Window       grab_xwindow,
+                                          Time         timestamp);
+
 gboolean meta_display_begin_grab_op (MetaDisplay *display,
                                      MetaScreen  *screen,
                                      MetaWindow  *window,

src/keybindings.c

@@ -1472,7 +1472,10 @@ process_keyboard_move_grab (MetaDisplay *display,
     }
 
   if (handled)
+    {
       meta_window_move (window, TRUE, x, y);
+      meta_window_warp_pointer (window, display->grab_op);
+    }
 
   return handled;
 }
@@ -1513,7 +1516,7 @@ process_keyboard_resize_grab (MetaDisplay *display,
                                display->grab_initial_window_pos.width,
                                display->grab_initial_window_pos.height);
 
-      return TRUE;
+      return FALSE;
     }
   
   switch (display->grab_op)
@@ -1620,7 +1623,10 @@ process_keyboard_resize_grab (MetaDisplay *display,
     }
 
   if (handled)
+    {
+      meta_window_update_resize_grab_op (window, TRUE);
       return TRUE; 
+    } 
 
   meta_window_get_position (window, &orig_x, &orig_y);
   x = orig_x;
@@ -1848,7 +1854,10 @@ process_keyboard_resize_grab (MetaDisplay *display,
     width = 1;
   
   if (handled)
+    {
       meta_window_move_resize (window, TRUE, x, y, width, height);
+      meta_window_update_resize_grab_op (window, FALSE);
+    }
 
   return handled;
 }
@@ -2465,14 +2474,9 @@ handle_begin_move         (MetaDisplay    *display,
 {
   if (window)
     {
-      meta_window_raise (window);
+      meta_window_begin_grab_op (window,
-      meta_display_begin_grab_op (window->display,
-                                  window->screen,
-                                  window,
                                  META_GRAB_OP_KEYBOARD_MOVING,
-                                  FALSE, 0, 0,
+                                 event->xkey.time);
-                                  event->xkey.time,
-                                  0, 0);
     }
 }
 
@@ -2484,14 +2488,9 @@ handle_begin_resize       (MetaDisplay    *display,
 {
   if (window)
     {
-      meta_window_raise (window);
+      meta_window_begin_grab_op (window,
-      meta_display_begin_grab_op (window->display,
-                                  window->screen,
-                                  window,
                                  META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN,
-                                  FALSE, 0, 0,
+                                 event->xkey.time);
-                                  event->xkey.time,
-                                  0, 0);
     }
 }
 

src/window.c

@@ -3418,14 +3418,10 @@ meta_window_client_message (MetaWindow *window,
           ((window->has_move_func && op == META_GRAB_OP_KEYBOARD_MOVING) ||
            (window->has_resize_func && op == META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN)))
         {
-          meta_window_raise (window);
+
-          meta_display_begin_grab_op (window->display,
+          meta_window_begin_grab_op (window,
-                                      window->screen,
-                                      window,
                                      op,
-                                      FALSE, 0, 0,
+                                     meta_display_get_current_time (window->display));
-                                      meta_display_get_current_time (window->display),
-                                      0, 0);
         }
       else if (op != META_GRAB_OP_NONE &&
                ((window->has_move_func && op == META_GRAB_OP_MOVING) ||
@@ -5679,25 +5675,15 @@ menu_callback (MetaWindowMenu *menu,
           break;
 
         case META_MENU_OP_MOVE:
-          meta_window_raise (window);
+          meta_window_begin_grab_op (window,
-          meta_display_begin_grab_op (window->display,
-                                      window->screen,
-                                      window,
                                      META_GRAB_OP_KEYBOARD_MOVING,
-                                      FALSE, 0, 0,
+                                     meta_display_get_current_time (window->display));
-                                      meta_display_get_current_time (window->display),
-                                      0, 0);
           break;
 
         case META_MENU_OP_RESIZE:
-          meta_window_raise (window);
+          meta_window_begin_grab_op (window,
-          meta_display_begin_grab_op (window->display,
-                                      window->screen,
-                                      window,
                                      META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN,
-                                      FALSE, 0, 0,
+                                     meta_display_get_current_time (window->display));
-                                      meta_display_get_current_time (window->display),
-                                      0, 0);
           break;
           
         case 0:
@@ -5821,11 +5807,11 @@ update_move (MetaWindow  *window,
   int dx, dy;
   int new_x, new_y;
   
-  dx = x - window->display->grab_root_x;
+  dx = x - window->display->grab_current_root_x;
-  dy = y - window->display->grab_root_y;
+  dy = y - window->display->grab_current_root_y;
 
-  new_x = window->display->grab_initial_window_pos.x + dx;
+  new_x = window->display->grab_current_window_pos.x + dx;
-  new_y = window->display->grab_initial_window_pos.y + dy;
+  new_y = window->display->grab_current_window_pos.y + dy;
 
   if (mask & ShiftMask)
     {
@@ -5845,23 +5831,29 @@ update_resize (MetaWindow *window,
   int new_w, new_h;
   int gravity;
   
-  dx = x - window->display->grab_root_x;
+  dx = x - window->display->grab_current_root_x;
-  dy = y - window->display->grab_root_y;
+  dy = y - window->display->grab_current_root_y;
 
-  new_w = window->display->grab_initial_window_pos.width;
+  new_w = window->display->grab_current_window_pos.width;
-  new_h = window->display->grab_initial_window_pos.height;
+  new_h = window->display->grab_current_window_pos.height;
 
   switch (window->display->grab_op)
     {
     case META_GRAB_OP_RESIZING_SE:
     case META_GRAB_OP_RESIZING_NE:
     case META_GRAB_OP_RESIZING_E:
+    case META_GRAB_OP_KEYBOARD_RESIZING_SE:
+    case META_GRAB_OP_KEYBOARD_RESIZING_NE:
+    case META_GRAB_OP_KEYBOARD_RESIZING_E:
       new_w += dx;
       break;
 
     case META_GRAB_OP_RESIZING_NW:
     case META_GRAB_OP_RESIZING_SW:
     case META_GRAB_OP_RESIZING_W:
+    case META_GRAB_OP_KEYBOARD_RESIZING_NW:
+    case META_GRAB_OP_KEYBOARD_RESIZING_SW:
+    case META_GRAB_OP_KEYBOARD_RESIZING_W:
       new_w -= dx;
       break;
       
@@ -5874,12 +5866,18 @@ update_resize (MetaWindow *window,
     case META_GRAB_OP_RESIZING_SE:
     case META_GRAB_OP_RESIZING_S:
     case META_GRAB_OP_RESIZING_SW:
+    case META_GRAB_OP_KEYBOARD_RESIZING_SE:
+    case META_GRAB_OP_KEYBOARD_RESIZING_S:
+    case META_GRAB_OP_KEYBOARD_RESIZING_SW:
       new_h += dy;
       break;
       
     case META_GRAB_OP_RESIZING_N:
     case META_GRAB_OP_RESIZING_NE:
     case META_GRAB_OP_RESIZING_NW:
+    case META_GRAB_OP_KEYBOARD_RESIZING_N:
+    case META_GRAB_OP_KEYBOARD_RESIZING_NE:
+    case META_GRAB_OP_KEYBOARD_RESIZING_NW:
       new_h -= dy;
       break;
     default:
@@ -5903,6 +5901,7 @@ meta_window_handle_mouse_grab_op_event (MetaWindow *window,
       switch (window->display->grab_op)
         {
         case META_GRAB_OP_MOVING:
+        case META_GRAB_OP_KEYBOARD_MOVING:
           update_move (window, event->xbutton.state,
                        event->xbutton.x_root, event->xbutton.y_root);
           break;
@@ -5915,6 +5914,14 @@ meta_window_handle_mouse_grab_op_event (MetaWindow *window,
         case META_GRAB_OP_RESIZING_SW:
         case META_GRAB_OP_RESIZING_NE:
         case META_GRAB_OP_RESIZING_NW:
+        case META_GRAB_OP_KEYBOARD_RESIZING_S:
+        case META_GRAB_OP_KEYBOARD_RESIZING_N:
+        case META_GRAB_OP_KEYBOARD_RESIZING_W:
+        case META_GRAB_OP_KEYBOARD_RESIZING_E:
+        case META_GRAB_OP_KEYBOARD_RESIZING_SE:
+        case META_GRAB_OP_KEYBOARD_RESIZING_NE:
+        case META_GRAB_OP_KEYBOARD_RESIZING_SW:
+        case META_GRAB_OP_KEYBOARD_RESIZING_NW:
           update_resize (window, event->xbutton.x_root, event->xbutton.y_root);
           break;
 
@@ -5929,6 +5936,7 @@ meta_window_handle_mouse_grab_op_event (MetaWindow *window,
       switch (window->display->grab_op)
         {
         case META_GRAB_OP_MOVING:
+        case META_GRAB_OP_KEYBOARD_MOVING:
           {
             int x, y;
             window_query_root_pointer (window, &x, &y);
@@ -5946,6 +5954,14 @@ meta_window_handle_mouse_grab_op_event (MetaWindow *window,
         case META_GRAB_OP_RESIZING_SW:
         case META_GRAB_OP_RESIZING_NE:
         case META_GRAB_OP_RESIZING_NW:
+        case META_GRAB_OP_KEYBOARD_RESIZING_S:
+        case META_GRAB_OP_KEYBOARD_RESIZING_N:
+        case META_GRAB_OP_KEYBOARD_RESIZING_W:
+        case META_GRAB_OP_KEYBOARD_RESIZING_E:
+        case META_GRAB_OP_KEYBOARD_RESIZING_SE:
+        case META_GRAB_OP_KEYBOARD_RESIZING_NE:
+        case META_GRAB_OP_KEYBOARD_RESIZING_SW:
+        case META_GRAB_OP_KEYBOARD_RESIZING_NW:
           {
             int x, y;
             window_query_root_pointer (window, &x, &y);
@@ -6208,3 +6224,139 @@ meta_window_is_ancestor_of_transient (MetaWindow *window,
 
   return FALSE;
 }
+
+static gboolean
+warp_pointer (MetaWindow *window,
+              MetaGrabOp  grab_op,
+              int        *x,
+              int        *y)
+{
+  switch (grab_op)
+    {
+      case META_GRAB_OP_KEYBOARD_MOVING:
+      case META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN:
+        *x = window->rect.width / 2;
+        *y = window->rect.height / 2;
+        break;
+
+      case META_GRAB_OP_KEYBOARD_RESIZING_S:
+        *x = window->rect.width / 2;
+        *y = window->rect.height;
+        break;
+
+      case META_GRAB_OP_KEYBOARD_RESIZING_N:
+        *x = window->rect.width / 2;
+        *y = 0;
+        break;
+
+      case META_GRAB_OP_KEYBOARD_RESIZING_W:
+        *x = 0;
+        *y = window->rect.height / 2;
+        break;
+
+      case META_GRAB_OP_KEYBOARD_RESIZING_E:
+        *x = window->rect.width;
+        *y = window->rect.height / 2;
+        break;
+
+      case META_GRAB_OP_KEYBOARD_RESIZING_SE:
+        *x = window->rect.width;
+        *y = window->rect.height;
+        break;
+
+      case META_GRAB_OP_KEYBOARD_RESIZING_NE:
+        *x = window->rect.width;
+        *y = 0;
+        break;
+
+      case META_GRAB_OP_KEYBOARD_RESIZING_SW:
+        *x = 0;
+        *y = window->rect.height;
+        break;
+
+      case META_GRAB_OP_KEYBOARD_RESIZING_NW:
+        *x = 0;
+        *y = 0;
+        break;
+
+      default:
+        return FALSE;
+    }
+
+  meta_error_trap_push (window->display);
+  
+  XWarpPointer (window->display->xdisplay,
+                None,
+                window->xwindow,
+                0, 0, 0, 0, 
+                *x,
+                *y);
+
+  if (meta_error_trap_pop (window->display))
+    {
+      meta_verbose ("Failed to warp pointer for window %s\n", window->desc);
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
+gboolean
+meta_window_warp_pointer (MetaWindow *window,
+                          MetaGrabOp  grab_op)
+{
+  int x, y;
+ 
+  return warp_pointer (window, grab_op, &x, &y); 
+}
+
+void
+meta_window_begin_grab_op (MetaWindow *window,
+                           MetaGrabOp  op,
+                           Time        timestamp)
+{
+  int x, y, x_offset, y_offset;
+
+  meta_window_get_position (window, &x, &y);
+
+  meta_window_raise (window);
+
+  warp_pointer (window, op, &x_offset, &y_offset);
+
+  meta_display_begin_grab_op (window->display,
+                              window->screen,
+                              window,
+                              op,
+                              FALSE, 0, 0,
+                              timestamp,
+                              x + x_offset, 
+                              y + y_offset);
+}
+
+void meta_window_update_resize_grab_op (MetaWindow *window,
+                                        gboolean    update_cursor)
+{
+  int x, y, x_offset, y_offset;
+
+  meta_window_get_position (window, &x, &y);
+
+  warp_pointer (window, window->display->grab_op, &x_offset, &y_offset);
+
+  window->display->grab_current_root_x = x + x_offset;
+  window->display->grab_current_root_y = y + y_offset;
+
+  if (window->display->grab_window)
+    {
+      window->display->grab_current_window_pos = window->rect;
+    }
+
+  if (update_cursor)
+    {
+      meta_display_set_grab_op_cursor (window->display,
+                                       window->display->grab_op,
+                                       TRUE,
+                                       window->display->grab_xwindow,
+                                       meta_display_get_current_time (window->display));
+    }
+}
+

src/window.h

@@ -406,4 +406,14 @@ void meta_window_foreach_transient (MetaWindow            *window,
 gboolean meta_window_is_ancestor_of_transient (MetaWindow *window,
                                                MetaWindow *transient);
 
+gboolean meta_window_warp_pointer (MetaWindow *window,
+                                   MetaGrabOp  grab_op);
+
+void meta_window_begin_grab_op (MetaWindow *window,
+                                MetaGrabOp  op,
+                                Time        timestamp);
+
+void meta_window_update_resize_grab_op (MetaWindow *window,
+                                        gboolean    update_cursor);
+
 #endif