elput: Add API function to set left-handed device

This commit adds an API function which Enlightenment can call in order
to set an input device to be "left-handed". Mainly used for a mouse
pointer, but not specific to pointers.

@feature

Signed-off-by: Chris Michael <cpmichael@osg.samsung.com>

src/lib/elput/Elput.h

@@ -285,6 +285,20 @@ EAPI void elput_input_pointer_xy_get(Elput_Manager *manager, const char *seat, i
  */
 EAPI void elput_input_pointer_xy_set(Elput_Manager *manager, const char *seat, int x, int y);
 
+/**
+ * Set the pointer left-handed mode
+ *
+ * @param manager
+ * @param seat
+ * @param left
+ *
+ * @return EINA_TRUE on success, EINA_FALSE otherwise
+ *
+ * @ingroup Elput_Input_Group
+ * @since 1.18
+ */
+EAPI Eina_Bool elput_input_pointer_left_handed_set(Elput_Manager *manager, const char *seat, Eina_Bool left);
+
 /**
  * Get the list of devices on a given seat
  *

src/lib/elput/elput_input.c

@@ -332,6 +332,47 @@ elput_input_pointer_xy_set(Elput_Manager *manager, const char *seat, int x, int
      }
 }
 
+EAPI Eina_Bool
+elput_input_pointer_left_handed_set(Elput_Manager *manager, const char *seat, Eina_Bool left)
+{
+   Elput_Seat *eseat;
+   Elput_Device *edev;
+   Eina_List *l, *ll;
+
+   EINA_SAFETY_ON_NULL_RETURN_VAL(manager, EINA_FALSE);
+
+   /* if no seat name is passed in, just use default seat name */
+   if (!seat) seat = "seat0";
+
+   EINA_LIST_FOREACH(manager->input.seats, l, eseat)
+     {
+        if ((eseat->name) && (strcmp(eseat->name, seat)))
+          continue;
+
+        EINA_LIST_FOREACH(eseat->devices, ll, edev)
+          {
+             if (!libinput_device_has_capability(edev->device,
+                                                 LIBINPUT_DEVICE_CAP_POINTER))
+               continue;
+
+             if (edev->left_handed == left) continue;
+
+             if (libinput_device_config_left_handed_set(edev->device,
+                                                        (int)left) !=
+                 LIBINPUT_CONFIG_STATUS_SUCCESS)
+               {
+                  WRN("Failed to set left handed mode for device: %s",
+                      libinput_device_get_name(edev->device));
+                  continue;
+               }
+             else
+               edev->left_handed = !!left;
+          }
+     }
+
+   return EINA_TRUE;
+}
+
 EAPI const Eina_List *
 elput_input_devices_get(Elput_Seat *seat)
 {

src/lib/elput/elput_private.h

@@ -212,6 +212,8 @@ struct _Elput_Device
    struct libinput_device *device;
 
    Elput_Device_Capability caps;
+
+   Eina_Bool left_handed : 1;
 };
 
 struct _Elput_Manager