[mutter] clutter/x11: Implement XTest-based ClutterVirtualInputDevice

[Carlos Garnacho <carlosg src gnome org>]

commit 674a48335d9c74fc336e03f4a821cdde368b700e
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Oct 12 19:26:07 2016 +0200

    clutter/x11: Implement XTest-based ClutterVirtualInputDevice
    
    This will be used too on X11 in order to implement the button-to-keycombo
    mapping in pad devices.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773779

 clutter/clutter/x11/clutter-device-manager-xi2.c   |   12 +++++++++++
 .../clutter/x11/clutter-virtual-input-device-x11.c |   21 ++++++++++++++++++++
 clutter/configure.ac                               |   16 +++++++++++++++
 3 files changed, 49 insertions(+), 0 deletions(-)
---
diff --git a/clutter/clutter/x11/clutter-device-manager-xi2.c 
b/clutter/clutter/x11/clutter-device-manager-xi2.c
index 8c645cc..32ddbfc 100644
--- a/clutter/clutter/x11/clutter-device-manager-xi2.c
+++ b/clutter/clutter/x11/clutter-device-manager-xi2.c
@@ -29,6 +29,7 @@
 
 #include "clutter-backend-x11.h"
 #include "clutter-input-device-xi2.h"
+#include "clutter-virtual-input-device-x11.h"
 #include "clutter-stage-x11.h"
 
 #include "clutter-backend.h"
@@ -1678,6 +1679,16 @@ clutter_device_manager_xi2_set_property (GObject      *gobject,
     }
 }
 
+static ClutterVirtualInputDevice *
+clutter_device_manager_xi2_create_virtual_device (ClutterDeviceManager   *manager,
+                                                  ClutterInputDeviceType  device_type)
+{
+  return g_object_new (CLUTTER_TYPE_VIRTUAL_INPUT_DEVICE_X11,
+                       "device-manager", manager,
+                       "device-type", device_type,
+                       NULL);
+}
+
 static void
 clutter_device_manager_xi2_class_init (ClutterDeviceManagerXI2Class *klass)
 {
@@ -1705,6 +1716,7 @@ clutter_device_manager_xi2_class_init (ClutterDeviceManagerXI2Class *klass)
   manager_class->get_core_device = clutter_device_manager_xi2_get_core_device;
   manager_class->get_device = clutter_device_manager_xi2_get_device;
   manager_class->select_stage_events = clutter_device_manager_xi2_select_stage_events;
+  manager_class->create_virtual_device = clutter_device_manager_xi2_create_virtual_device;
 }
 
 static void
diff --git a/clutter/clutter/x11/clutter-virtual-input-device-x11.c 
b/clutter/clutter/x11/clutter-virtual-input-device-x11.c
index a13915b..704de5d 100644
--- a/clutter/clutter/x11/clutter-virtual-input-device-x11.c
+++ b/clutter/clutter/x11/clutter-virtual-input-device-x11.c
@@ -27,6 +27,9 @@
 
 #include <glib-object.h>
 
+#include "clutter-x11.h"
+#include "X11/extensions/XTest.h"
+
 #include "clutter-virtual-input-device.h"
 #include "x11/clutter-virtual-input-device-x11.h"
 
@@ -61,6 +64,8 @@ clutter_virtual_input_device_x11_notify_button (ClutterVirtualInputDevice *virtu
                                                 uint32_t                   button,
                                                 ClutterButtonState         button_state)
 {
+  XTestFakeButtonEvent (clutter_x11_get_default_display (),
+                        button, button_state == CLUTTER_BUTTON_STATE_PRESSED, 0);
 }
 
 static void
@@ -69,6 +74,21 @@ clutter_virtual_input_device_x11_notify_key (ClutterVirtualInputDevice *virtual_
                                              uint32_t                   key,
                                              ClutterKeyState            key_state)
 {
+  XTestFakeKeyEvent (clutter_x11_get_default_display (),
+                     key, key_state == CLUTTER_KEY_STATE_PRESSED, 0);
+}
+
+static void
+clutter_virtual_input_device_x11_notify_keyval (ClutterVirtualInputDevice *virtual_device,
+                                               uint64_t                   time_us,
+                                               uint32_t                   keyval,
+                                               ClutterKeyState            key_state)
+{
+  KeyCode keycode;
+
+  keycode = XKeysymToKeycode (clutter_x11_get_default_display (), keyval);
+  XTestFakeKeyEvent (clutter_x11_get_default_display (),
+                     keycode, key_state == CLUTTER_KEY_STATE_PRESSED, 0);
 }
 
 static void
@@ -86,4 +106,5 @@ clutter_virtual_input_device_x11_class_init (ClutterVirtualInputDeviceX11Class *
   virtual_input_device_class->notify_absolute_motion = 
clutter_virtual_input_device_x11_notify_absolute_motion;
   virtual_input_device_class->notify_button = clutter_virtual_input_device_x11_notify_button;
   virtual_input_device_class->notify_key = clutter_virtual_input_device_x11_notify_key;
+  virtual_input_device_class->notify_keyval = clutter_virtual_input_device_x11_notify_keyval;
 }
diff --git a/clutter/configure.ac b/clutter/configure.ac
index ad5be7c..f334cc1 100644
--- a/clutter/configure.ac
+++ b/clutter/configure.ac
@@ -382,6 +382,22 @@ AS_IF([test "x$SUPPORT_X11" = "x1"],
               [AC_MSG_ERROR([not found])]
         )
 
+        # XTEST (required)
+        AC_MSG_CHECKING([for XTest extension])
+        PKG_CHECK_EXISTS([xtst], [have_xtest=yes], [have_xtest=no])
+        AS_IF([test "x$have_xtest" = "xyes"],
+              [
+                AC_DEFINE(HAVE_XTEST, [1], [Define to 1 if we have the XTest X extension])
+
+                X11_LIBS="$X11_LIBS -lXtst"
+                X11_PC_FILES="$X11_PC_FILES xtst"
+                X11_EXTS="$X11_EXTS xtst"
+
+                AC_MSG_RESULT([found])
+              ],
+              [AC_MSG_ERROR([Not found])]
+        )
+
         # X Generic Extensions (optional)
         clutter_save_CPPFLAGS="$CPPFLAGS"
         CPPFLAGS="$CPPFLAGS $X11_CFLAGS"