From aee186b4f3fdc27b5fe6ac13238e517f4f02fe15 Mon Sep 17 00:00:00 2001
From: "jhyuni.kang" <jhyuni.kang@samsung.com>
Date: Tue, 12 May 2015 08:57:03 -0400
Subject: [PATCH] ecore-wayland: Add a grab_count variable for synchronization
 wl_input_grab/ungrab with pointer and touch event

Summary:
The touch screen device generates touch events.
         But in some special enviroments, a first finger will be matched to a pointer event(not touch event).
         And other fingers (second, third, ...) will be matched touch events.
         In that case ecore_wl_input_ungrab() is called abnormally.
         A first finger pressed, _ecore_wl_input_cb_pointer_button() call ecore_wl_input_grab().
         A second finger pressed, _ecore_wl_input_cb_touch_down() is called but not grab.
         But when a second finger is released, _ecore_wl_input_cb_touch_up() call ecore_wl_input_ungrab()
         So ungrab function generate two mouse up events and a first finger is released.
         In other case, first finger pressed -> second finger pressed -> first finger release.
         That case when a first finger released a second finger release event is generated.
         So after that application doesn't get a release event about a second finger
         when a second finger is really released.

         I think in a multitouch case, ungrab function will be called when a all finger are released.
         So I add a grab_count variable for count currently touched fingers.
         And only called a ungrab funtion all fingers are released.

Test Plan:
In a touch screen supported multitouch, press two or more fingers and release.
           And watch events generation.

Reviewers: raster, devilhorns

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D2481
---
 src/lib/ecore_wayland/ecore_wl_input.c   | 28 +++++++++++++++++-------
 src/lib/ecore_wayland/ecore_wl_private.h |  1 +
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/src/lib/ecore_wayland/ecore_wl_input.c b/src/lib/ecore_wayland/ecore_wl_input.c
index b0297e9c14..294121fd1e 100755
--- a/src/lib/ecore_wayland/ecore_wl_input.c
+++ b/src/lib/ecore_wayland/ecore_wl_input.c
@@ -583,7 +583,7 @@ _ecore_wl_input_cb_pointer_button(void *data, struct wl_pointer *pointer EINA_UN
 
    if (state)
      {
-        if ((input->pointer_focus) && (!input->grab))
+        if ((input->pointer_focus) && (!input->grab) && (!input->grab_count))
           {
              ecore_wl_input_grab(input, input->pointer_focus, button);
              input->grab_timestamp = timestamp;
@@ -592,6 +592,7 @@ _ecore_wl_input_cb_pointer_button(void *data, struct wl_pointer *pointer EINA_UN
         if (input->pointer_focus)
           _ecore_wl_input_mouse_down_send(input, input->pointer_focus,
                                           0, button, timestamp);
+        input->grab_count++;
      }
    else
      {
@@ -599,7 +600,10 @@ _ecore_wl_input_cb_pointer_button(void *data, struct wl_pointer *pointer EINA_UN
           _ecore_wl_input_mouse_up_send(input, input->pointer_focus,
                                         0, button, timestamp);
 
-        if ((input->grab) && (input->grab_button == button) && (!state))
+        input->grab_count--;
+        if (input->grab_count < 0)
+            input->grab_count = 0;
+        if ((input->grab) && (input->grab_button == button) && (!state) && (!input->grab_count))
           ecore_wl_input_ungrab(input);
      }
 
@@ -1074,16 +1078,21 @@ _ecore_wl_input_cb_touch_down(void *data, struct wl_touch *touch EINA_UNUSED, un
    input->sx = wl_fixed_to_int(x);
    input->sy = wl_fixed_to_int(y);
 
-   _ecore_wl_input_mouse_move_send(input, input->touch_focus, timestamp, id);
-   _ecore_wl_input_cb_pointer_enter(data, NULL, serial, surface, x, y);
-   if ((input->touch_focus) && (!input->grab))
+   //_ecore_wl_input_mouse_move_send(input, input->touch_focus, timestamp, id);
+   if (!input->grab_count)
      {
-        ecore_wl_input_grab(input, input->touch_focus, BTN_LEFT);
-        input->grab_timestamp = timestamp;
+      _ecore_wl_input_cb_pointer_enter(data, NULL, serial, surface, x, y);
+      if ((input->touch_focus) && (!input->grab))
+        {
+           ecore_wl_input_grab(input, input->touch_focus, BTN_LEFT);
+           input->grab_timestamp = timestamp;
+        }
      }
 
    _ecore_wl_input_mouse_down_send(input, input->touch_focus,
                                    id, BTN_LEFT, timestamp);
+
+   input->grab_count++;
 }
 
 static void
@@ -1100,7 +1109,10 @@ _ecore_wl_input_cb_touch_up(void *data, struct wl_touch *touch EINA_UNUSED, unsi
    input->display->serial = serial;
 
    _ecore_wl_input_mouse_up_send(input, input->touch_focus, id, BTN_LEFT, timestamp);
-   if ((input->grab) && (input->grab_button == BTN_LEFT))
+   input->grab_count--;
+   if (input->grab_count < 0)
+     input->grab_count = 0;
+   if ((input->grab) && (input->grab_button == BTN_LEFT) && (!input->grab_count))
      ecore_wl_input_ungrab(input);
 }
 
diff --git a/src/lib/ecore_wayland/ecore_wl_private.h b/src/lib/ecore_wayland/ecore_wl_private.h
index 77c12dbdf6..c54b157c1f 100644
--- a/src/lib/ecore_wayland/ecore_wl_private.h
+++ b/src/lib/ecore_wayland/ecore_wl_private.h
@@ -209,6 +209,7 @@ struct _Ecore_Wl_Input
    Ecore_Wl_Window *grab;
    unsigned int grab_button;
    unsigned int grab_timestamp;
+   unsigned int grab_count;
 
    Ecore_Wl_Dnd_Source *drag_source;
    Ecore_Wl_Dnd_Source *selection_source;