Implement selection copy & paste using data interfaces of wayland

Summary: It supports selection copy & pasete with wl_data_device_manager, wl_data_device, wl_data_offer and wl_data_source.

Test Plan:
1. Build enlightenment on devs/devilhorns/e_comp_wl branch.
2. Run enlightenment.
3. Run elementary_test -to entry5 (or any entry samples).
4. Select any block of text.
5. Do copy the block and Copy anywhere you want.

Reviewers: gwanglim, devilhorns

CC: cedric

Differential Revision: https://phab.enlightenment.org/D1094

src/bin/e_comp_wl.h

@@ -107,9 +107,18 @@ struct _E_Comp_Wl_Data
    struct 
      {
         struct wl_global *global;
+        Eina_List *data_resource_list;
      } mgr;
 
-   struct 
+   struct
+     {
+        void *data_source;
+        uint32_t serial;
+        struct wl_signal signal;
+        struct wl_listener data_source_listener;
+     } selection;
+
+   struct
      {
         struct wl_resource *resource;
         int32_t width, height;

src/bin/e_comp_wl_data.c

@@ -3,6 +3,186 @@
 #include "e_comp_wl_data.h"
 
 static void 
+_e_comp_wl_data_offer_cb_accept(struct wl_client *client EINA_UNUSED, struct wl_resource *resource, uint32_t serial, const char *mime_type)
+{
+   E_Comp_Wl_Data_Offer *offer;
+
+   if (!(offer = wl_resource_get_user_data(resource)))
+     return;
+
+   if (offer->source)
+     offer->source->target(offer->source, serial, mime_type);
+}
+
+static void
+_e_comp_wl_data_offer_cb_receive(struct wl_client *client EINA_UNUSED, struct wl_resource *resource, const char *mime_type, int32_t fd)
+{
+   E_Comp_Wl_Data_Offer *offer;
+
+   if (!(offer = wl_resource_get_user_data(resource)))
+     return;
+
+   if (offer->source)
+     offer->source->send(offer->source, mime_type, fd);
+   else
+     close(fd);
+}
+
+/* called by wl_data_offer_destroy */
+static void
+_e_comp_wl_data_offer_cb_destroy(struct wl_client *client EINA_UNUSED, struct wl_resource *resource)
+{
+   wl_resource_destroy(resource);
+}
+
+/* called by wl_resource_destroy */
+static void
+_e_comp_wl_data_offer_cb_resource_destroy(struct wl_resource *resource)
+{
+   E_Comp_Wl_Data_Offer *offer;
+
+   if (!(offer = wl_resource_get_user_data(resource)))
+     return;
+
+   if (offer->source)
+     wl_list_remove(&offer->source_destroy_listener.link);
+
+   free(offer);
+}
+
+/* called by emission of source->destroy_signal */
+static void
+_e_comp_wl_data_offer_cb_source_destroy(struct wl_listener *listener, void *data EINA_UNUSED)
+{
+   E_Comp_Wl_Data_Offer *offer;
+
+   offer = container_of(listener, E_Comp_Wl_Data_Offer, source_destroy_listener);
+   offer->source = NULL;
+}
+
+static const struct wl_data_offer_interface _e_data_offer_interface =
+{
+   _e_comp_wl_data_offer_cb_accept,
+   _e_comp_wl_data_offer_cb_receive,
+   _e_comp_wl_data_offer_cb_destroy,
+};
+
+static void
+_e_comp_wl_data_source_cb_offer(struct wl_client *client EINA_UNUSED, struct wl_resource *resource, const char *mime_type)
+{
+   E_Comp_Wl_Data_Source *source;
+
+   if (!(source = wl_resource_get_user_data(resource)))
+     return;
+
+   source->mime_types = eina_list_append(source->mime_types, eina_stringshare_add(mime_type));
+}
+
+/* called by wl_data_source_destroy */
+static void
+_e_comp_wl_data_source_cb_destroy(struct wl_client *client EINA_UNUSED, struct wl_resource *resource)
+{
+   wl_resource_destroy(resource);
+}
+
+/* called by wl_resource_destroy */
+static void
+_e_comp_wl_data_source_cb_resource_destroy(struct wl_resource *resource)
+{
+   E_Comp_Wl_Data_Source *source;
+   char *t;
+
+   if (!(source = wl_resource_get_user_data(resource)))
+     return;
+
+   wl_signal_emit(&source->destroy_signal, source);
+
+   EINA_LIST_FREE(source->mime_types, t)
+      eina_stringshare_del(t);
+
+   free(source);
+}
+
+static void
+_e_comp_wl_data_source_target_send(E_Comp_Wl_Data_Source *source, uint32_t serial EINA_UNUSED, const char* mime_type)
+{
+   wl_data_source_send_target(source->resource, mime_type);
+}
+
+static void
+_e_comp_wl_data_source_send_send(E_Comp_Wl_Data_Source *source, const char* mime_type, int32_t fd)
+{
+   wl_data_source_send_send(source->resource, mime_type, fd);
+   close(fd);
+}
+
+static void
+_e_comp_wl_data_source_cancelled_send(E_Comp_Wl_Data_Source *source)
+{
+   wl_data_source_send_cancelled(source->resource);
+}
+
+static const struct wl_data_source_interface _e_data_source_interface =
+{
+   _e_comp_wl_data_source_cb_offer,
+   _e_comp_wl_data_source_cb_destroy,
+};
+
+static void
+_e_comp_wl_data_device_destroy_selection_data_source(struct wl_listener *listener, void *data)
+{
+   E_Comp_Wl_Data *cdata;
+   E_Comp_Wl_Data_Source *source;
+   struct wl_resource *data_device_res;
+
+   if (!(source = (E_Comp_Wl_Data_Source*)data))
+     return;
+
+   if (!(cdata = container_of(listener, E_Comp_Wl_Data, selection.data_source_listener)))
+     return;
+
+   cdata->selection.data_source = NULL;
+
+   /* TODO: get data device from a focused surface */
+   data_device_res = _e_comp_wl_data_find_for_client(cdata->mgr.data_resource_list, wl_resource_get_client(source->resource));
+
+   if (data_device_res)
+     wl_data_device_send_selection(data_device_res, NULL);
+
+   wl_signal_emit(&cdata->selection.signal, cdata);
+}
+
+static struct wl_resource*
+_e_comp_wl_data_device_data_offer_create(E_Comp_Wl_Data_Source *source, struct wl_resource *data_device_res)
+{
+   E_Comp_Wl_Data_Offer *offer;
+   Eina_List *l;
+   char *t;
+
+   offer = E_NEW(E_Comp_Wl_Data_Offer, 1);
+   if (!offer) return NULL;
+
+   offer->resource = wl_resource_create(wl_resource_get_client(data_device_res), &wl_data_offer_interface, 1, 0);
+   if (!offer->resource)
+     {
+        free(offer);
+        return NULL;
+     }
+
+   wl_resource_set_implementation(offer->resource, &_e_data_offer_interface, offer, _e_comp_wl_data_offer_cb_resource_destroy);
+   offer->source = source;
+   offer->source_destroy_listener.notify = _e_comp_wl_data_offer_cb_source_destroy;
+   wl_signal_add(&source->destroy_signal, &offer->source_destroy_listener);
+
+   wl_data_device_send_data_offer(data_device_res, offer->resource);
+
+   EINA_LIST_FOREACH(source->mime_types, l, t)
+      wl_data_offer_send_offer(offer->resource, t);
+
+   return offer->resource;
+}
+
+static void
 _e_comp_wl_data_device_cb_drag_start(struct wl_client *client EINA_UNUSED, struct wl_resource *resource EINA_UNUSED, struct wl_resource *source_resource EINA_UNUSED, struct wl_resource *origin_resource EINA_UNUSED, struct wl_resource *icon_resource EINA_UNUSED, uint32_t serial EINA_UNUSED)
 {
 
@@ -11,7 +191,51 @@ _e_comp_wl_data_device_cb_drag_start(struct wl_client *client EINA_UNUSED, struc
 static void 
 _e_comp_wl_data_device_cb_selection_set(struct wl_client *client EINA_UNUSED, struct wl_resource *resource EINA_UNUSED, struct wl_resource *source_resource EINA_UNUSED, uint32_t serial EINA_UNUSED)
 {
+   E_Comp_Wl_Data *cdata;
+   E_Comp_Wl_Data_Source *source, *sel_source;
+   struct wl_resource *offer_res, *data_device_res;
 
+   if (!source_resource) return;
+   if (!(cdata = wl_resource_get_user_data(resource))) return;
+
+   source = wl_resource_get_user_data(source_resource);
+   sel_source = (E_Comp_Wl_Data_Source*)cdata->selection.data_source;
+
+   if ((sel_source) &&
+       (cdata->selection.serial - serial < UINT32_MAX / 2))
+     return;
+
+   if (sel_source)
+     {
+        if (sel_source->cancelled)
+          sel_source->cancelled(sel_source);
+        wl_list_remove(&cdata->selection.data_source_listener.link);
+        cdata->selection.data_source = NULL;
+     }
+
+   cdata->selection.data_source = sel_source = source;
+   cdata->selection.serial = serial;
+
+   /* TODO: get data device from a focused surface */
+   data_device_res = _e_comp_wl_data_find_for_client(cdata->mgr.data_resource_list, wl_resource_get_client(source->resource));
+
+   if ((data_device_res) && (source))
+     {
+        offer_res = _e_comp_wl_data_device_data_offer_create(source, data_device_res);
+        wl_data_device_send_selection(data_device_res, offer_res);
+     }
+   else if (data_device_res)
+     {
+        wl_data_device_send_selection(data_device_res, NULL);
+     }
+
+   wl_signal_emit(&cdata->selection.signal, cdata);
+
+   if (source)
+     {
+        cdata->selection.data_source_listener.notify = _e_comp_wl_data_device_destroy_selection_data_source;
+        wl_signal_add(&source->destroy_signal, &cdata->selection.data_source_listener);
+     }
 }
 
 static const struct wl_data_device_interface _e_data_device_interface = 
@@ -20,14 +244,47 @@ static const struct wl_data_device_interface _e_data_device_interface =
    _e_comp_wl_data_device_cb_selection_set,
 };
 
-static void 
+static void
-_e_comp_wl_data_manager_cb_source_create(struct wl_client *client EINA_UNUSED, struct wl_resource *resource EINA_UNUSED, uint32_t id EINA_UNUSED)
+_e_comp_wl_data_device_cb_unbind(struct wl_resource *resource)
 {
-   /* NB: New resource */
+   E_Comp_Wl_Data *cdata;
+
+   if(!(cdata = wl_resource_get_user_data(resource)))
+     return;
+
+   cdata->mgr.data_resource_list = eina_list_remove(cdata->mgr.data_resource_list, resource);
+}
+
+static void
+_e_comp_wl_data_manager_cb_source_create(struct wl_client *client EINA_UNUSED, struct wl_resource *resource, uint32_t id EINA_UNUSED)
+{
+   E_Comp_Wl_Data_Source *source;
+
+   source = E_NEW(E_Comp_Wl_Data_Source, 1);
+   if (!source)
+     {
+        wl_resource_post_no_memory(resource);
+        return;
+     }
+
+   wl_signal_init(&source->destroy_signal);
+   source->target = _e_comp_wl_data_source_target_send;
+   source->send = _e_comp_wl_data_source_send_send;
+   source->cancelled = _e_comp_wl_data_source_cancelled_send;
+
+   source->resource = wl_resource_create(client, &wl_data_source_interface, 1, id);
+   if (!source->resource)
+     {
+        ERR("Could not create data source resource: %m");
+        free(source);
+        wl_resource_post_no_memory(resource);
+        return;
+     }
+   wl_resource_set_implementation(source->resource, &_e_data_source_interface, source, _e_comp_wl_data_source_cb_resource_destroy);
 }
 
 static void 
-_e_comp_wl_data_manager_cb_device_get(struct wl_client *client EINA_UNUSED, struct wl_resource *manager_resource, uint32_t id, struct wl_resource *seat_resource)
+_e_comp_wl_data_manager_cb_device_get(struct wl_client *client, struct wl_resource *manager_resource, uint32_t id, struct wl_resource *seat_resource)
 {
    E_Comp_Wl_Data *cdata;
    struct wl_resource *res;
@@ -46,7 +303,8 @@ _e_comp_wl_data_manager_cb_device_get(struct wl_client *client EINA_UNUSED, stru
         return;
      }
 
-   wl_resource_set_implementation(res, &_e_data_device_interface, cdata, NULL);
+   cdata->mgr.data_resource_list = eina_list_append(cdata->mgr.data_resource_list, res);
+   wl_resource_set_implementation(res, &_e_data_device_interface, cdata, _e_comp_wl_data_device_cb_unbind);
 }
 
 static const struct wl_data_device_manager_interface _e_manager_interface = 
@@ -96,15 +354,17 @@ e_comp_wl_data_manager_init(E_Comp_Wl_Data *cdata)
    if (!cdata) return EINA_FALSE;
 
    /* try to create global data manager */
-   cdata->mgr.global = 
+   cdata->mgr.global =
-     wl_global_create(cdata->wl.disp, &wl_data_device_manager_interface, 1, 
+     wl_global_create(cdata->wl.disp, &wl_data_device_manager_interface, 1,
                       cdata, _e_comp_wl_data_cb_bind_manager);
-   if (!cdata->mgr.global) 
+   if (!cdata->mgr.global)
      {
         ERR("Could not create global for data device manager: %m");
         return EINA_FALSE;
      }
 
+   wl_signal_init(&cdata->selection.signal);
+
    return EINA_TRUE;
 }
 

src/bin/e_comp_wl_data.h

@@ -3,6 +3,29 @@
 # ifndef E_COMP_WL_DATA_H
 #  define E_COMP_WL_DATA_H
 
+typedef struct _E_Comp_Wl_Data_Source E_Comp_Wl_Data_Source;
+typedef struct _E_Comp_Wl_Data_Offer E_Comp_Wl_Data_Offer;
+
+struct _E_Comp_Wl_Data_Source
+{
+   struct wl_resource *resource; //resource of wl_data_source
+
+   Eina_List *mime_types; //mime_type list to offer from source
+   struct wl_signal destroy_signal; //signal to emit when wl_data_source resource is destroyed
+
+   void (*target) (E_Comp_Wl_Data_Source *source, uint32_t serial, const char* mime_type);
+   void (*send) (E_Comp_Wl_Data_Source *source, const char* mime_type, int32_t fd);
+   void (*cancelled) (E_Comp_Wl_Data_Source *source);
+};
+
+struct _E_Comp_Wl_Data_Offer
+{
+   struct wl_resource *resource; //resource of wl_data_offer
+
+   E_Comp_Wl_Data_Source *source; //indicates source client data
+   struct wl_listener source_destroy_listener; //listener for destroy of source
+};
+
 EINTERN Eina_Bool e_comp_wl_data_manager_init(E_Comp_Wl_Data *cdata);
 EINTERN void e_comp_wl_data_manager_shutdown(E_Comp_Wl_Data *cdata);