gestures: use transparent window instead of grab function

This path removes the grab functionality from screen reader
due to some undefined behaviour it caused to EFL input processing.
The grab caused X11 internal devices hierarchy changed and EFL
is not properly updating and adjusting input processing to this changes.

Patch adds input window which will capture all input from screen.
Input window will be raised every time the _NET_CLIENT_LIST_STACKING
property changes on root window.

Change-Id: Ic961520772d84b6a3491ba62c292d7780666960c

diff --git a/src/screen_reader_gestures.c b/src/screen_reader_gestures.c
index ff89ccf..bf6b386 100644 (file)
--- a/src/screen_reader_gestures.c
+++ b/src/screen_reader_gestures.c
@@ -23,6 +23,8 @@
 
 static GestureCB _global_cb;
 static void *_global_data;
+static Ecore_Window win;
+static Ecore_Event_Handler *property_changed_hld;
 
 struct _Gestures_Config
 {
@@ -692,7 +694,8 @@ static void _get_root_coords(Ecore_X_Window win, int *x, int *y)
 void
 start_scroll(int x, int y)
 {
-   Ecore_X_Window under = ecore_x_window_at_xy_get(x, y);
+   Ecore_X_Window wins[1] = { win };
+   Ecore_X_Window under = ecore_x_window_at_xy_with_skip_get(x, y, wins, sizeof(wins)/sizeof(wins[0]));
    _get_root_coords(under, &rx, &ry);
    DEBUG("Starting scroll: %d %d", x - rx, y - ry);
    ecore_x_mouse_in_send(under, x - rx, y - ry);
@@ -1233,27 +1236,82 @@ _cb_mouse_move(void    *data EINA_UNUSED,
    return ECORE_CALLBACK_PASS_ON;
 }
 
+static Eina_Bool
+_gesture_input_win_create(void)
+{
+   int w, h;
+
+   if (!win)
+     {
+        Ecore_Window root = ecore_x_window_root_first_get();
+        if (!root)
+          return EINA_FALSE;
+        ecore_x_window_geometry_get(root, NULL, NULL, &w, &h);
+        win = ecore_x_window_input_new(root, 0, 0, w, h);
+     }
+   if (!win)
+     return EINA_FALSE;
+
+   ecore_x_input_multi_select(win);
+   ecore_x_window_show(win);
+   ecore_x_window_raise(win);
+
+   // restet gestures
+   memset(cov, 0x0, sizeof(Cover));
+
+   return EINA_TRUE;
+}
+
+static Eina_Bool
+_win_property_changed(void *data, int type, void *event)
+{
+   Ecore_X_Event_Window_Property *wp = event;
+
+   if (wp->atom != ECORE_X_ATOM_NET_CLIENT_LIST_STACKING)
+     return EINA_TRUE;
+
+   _gesture_input_win_create();
+
+   return EINA_TRUE;
+}
+
+static Eina_Bool
+_gestures_input_window_init(void)
+{
+   Ecore_Window root = ecore_x_window_root_first_get();
+   if (!root)
+     {
+        ERROR("No root window found. Is Window manager running?");
+        return EINA_FALSE;
+     }
+   ecore_x_event_mask_set(root, ECORE_X_EVENT_MASK_WINDOW_PROPERTY);
+   property_changed_hld = ecore_event_handler_add(ECORE_X_EVENT_WINDOW_PROPERTY, _win_property_changed, NULL);
+
+   return _gesture_input_win_create();
+}
+
+static void
+_gestures_input_widnow_shutdown(void)
+{
+   ecore_event_handler_del(property_changed_hld);
+   if (win) ecore_x_window_free(win);
+   win = 0;
+}
+
 Eina_Bool screen_reader_gestures_init(void)
 {
    ecore_init();
    ecore_x_init(NULL);
 
-   if (!ecore_x_pointer_grab(ecore_x_window_root_first_get()))
-      {
-         ERROR("Failed to grab pointer on: %x", ecore_x_window_root_first_get());
-         return EINA_FALSE;
-      }
-   if (!ecore_x_input_touch_devices_grab(ecore_x_window_root_first_get()))
-      {
-         ERROR("Failed to grab devices on: %x", ecore_x_window_root_first_get());
-         ecore_x_pointer_ungrab();
-         return EINA_FALSE;
-      }
-
-   ecore_x_input_multi_select(ecore_x_window_root_first_get());
-   _e_mod_config = calloc(sizeof(Gestures_Config), 1);
    cov = calloc(sizeof(Cover), 1);
 
+   if (!_gestures_input_window_init())
+     {
+        free(cov);
+        return EINA_FALSE;
+     }
+
+   _e_mod_config = calloc(sizeof(Gestures_Config), 1);
    _e_mod_config->one_finger_flick_min_length = 100;
    _e_mod_config->one_finger_flick_max_time = 400;
    _e_mod_config->two_finger_flick_to_scroll_timeout = 100;
@@ -1276,9 +1334,8 @@ void screen_reader_gestures_shutdown(void)
    {
       ecore_event_handler_del(hdlr);
    }
+   _gestures_input_widnow_shutdown();
 
-   ecore_x_input_touch_devices_ungrab();
-   ecore_x_pointer_ungrab();
    ecore_x_shutdown();
    ecore_shutdown();
    free(_e_mod_config);