[gtk+] entry: Add support for an Emoji chooser

[Matthias Clasen <matthiasc src gnome org>]

commit 558aebfbc4699bf4182df16509fd8c19c0ffd6e3
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Aug 11 12:05:24 2017 -0400

    entry: Add support for an Emoji chooser
    
    Add an "Insert Emoji" item to the context menu in entries.
    We also add a show-emoji-icon property, which when set to
    TRUE, will add an icon that can be clicked to bring up
    the Emoji chooser.

 gtk/gtkentry.c |  104 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 104 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkentry.c b/gtk/gtkentry.c
index 7240ec9..a0c2f5c 100644
--- a/gtk/gtkentry.c
+++ b/gtk/gtkentry.c
@@ -68,6 +68,7 @@
 #include "gtkmagnifierprivate.h"
 #include "gtkcssnodeprivate.h"
 #include "gtkimageprivate.h"
+#include "gtkemojichooser.h"
 
 #include "a11y/gtkentryaccessible.h"
 
@@ -235,6 +236,7 @@ struct _GtkEntryPrivate
   gint64        handle_place_time;
 
   guint         editable                : 1;
+  guint         show_emoji_icon         : 1;
   guint         in_drag                 : 1;
   guint         overwrite_mode          : 1;
   guint         visible                 : 1;
@@ -354,6 +356,7 @@ enum {
   PROP_ATTRIBUTES,
   PROP_POPULATE_ALL,
   PROP_TABS,
+  PROP_SHOW_EMOJI_ICON,
   PROP_EDITING_CANCELED,
   NUM_PROPERTIES = PROP_EDITING_CANCELED
 };
@@ -645,6 +648,8 @@ static void         buffer_notify_max_length           (GtkEntryBuffer *buffer,
 static void         buffer_connect_signals             (GtkEntry       *entry);
 static void         buffer_disconnect_signals          (GtkEntry       *entry);
 static GtkEntryBuffer *get_buffer                      (GtkEntry       *entry);
+static void         set_show_emoji_icon                (GtkEntry       *entry,
+                                                        gboolean        value);
 
 static void     gtk_entry_measure (GtkWidget           *widget,
                                    GtkOrientation       orientation,
@@ -1375,6 +1380,21 @@ gtk_entry_class_init (GtkEntryClass *class)
                           PANGO_TYPE_TAB_ARRAY,
                           GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
 
+  /**
+   * GtkEntry::show-emoji-icon:
+   *
+   * When this is %TRUE, the entry will show an emoji icon in the secondary
+   * icon position that brings up the Emoji chooser when clicked.
+   *
+   * Since: 3.92
+   */
+  entry_props[PROP_SHOW_EMOJI_ICON] =
+      g_param_spec_boolean ("show-emoji-icon",
+                            P_("Emoji icon"),
+                            P_("Whether to show an icon for Emoji"),
+                            FALSE,
+                            GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
+
   g_object_class_install_properties (gobject_class, NUM_PROPERTIES, entry_props);
 
   /**
@@ -2130,6 +2150,10 @@ gtk_entry_set_property (GObject         *object,
       gtk_entry_set_tabs (entry, g_value_get_boxed (value));
       break;
 
+    case PROP_SHOW_EMOJI_ICON:
+      set_show_emoji_icon (entry, g_value_get_boolean (value));
+      break;
+
     case PROP_SCROLL_OFFSET:
     case PROP_CURSOR_POSITION:
     default:
@@ -2358,6 +2382,10 @@ gtk_entry_get_property (GObject         *object,
       g_value_set_boxed (value, priv->tabs);
       break;
 
+    case PROP_SHOW_EMOJI_ICON:
+      g_value_set_boolean (value, priv->show_emoji_icon);
+      break;
+
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -8406,6 +8434,8 @@ typedef struct
   GdkEvent *trigger_event;
 } PopupInfo;
 
+static void gtk_entry_choose_emoji (GtkEntry *entry);
+
 static void
 popup_targets_received (GtkClipboard     *clipboard,
                        GtkSelectionData *data,
@@ -8462,6 +8492,15 @@ popup_targets_received (GtkClipboard     *clipboard,
       gtk_widget_show (menuitem);
       gtk_menu_shell_append (GTK_MENU_SHELL (menu), menuitem);
 
+      menuitem = gtk_menu_item_new_with_mnemonic (_("Insert _Emoji"));
+      gtk_widget_set_sensitive (menuitem,
+                                mode == DISPLAY_NORMAL &&
+                                info_entry_priv->editable);
+      g_signal_connect_swapped (menuitem, "activate",
+                                G_CALLBACK (gtk_entry_choose_emoji), entry);
+      gtk_widget_show (menuitem);
+      gtk_menu_shell_append (GTK_MENU_SHELL (menu), menuitem);
+
       g_signal_emit (entry, signals[POPULATE_POPUP], 0, menu);
 
       if (info->trigger_event && gdk_event_triggers_context_menu (info->trigger_event))
@@ -9792,3 +9831,68 @@ gtk_entry_get_tabs (GtkEntry *entry)
 
   return entry->priv->tabs;
 }
+
+static void
+gtk_entry_choose_emoji (GtkEntry *entry)
+{
+  GtkWidget *chooser;
+  GdkRectangle rect;
+
+  chooser = GTK_WIDGET (g_object_get_data (G_OBJECT (entry), "gtk-emoji-chooser"));
+  if (!chooser)
+    {
+      chooser = gtk_emoji_chooser_new ();
+      g_object_set_data_full (G_OBJECT (entry), "gtk-emoji-chooser", chooser, 
(GDestroyNotify)gtk_widget_destroy);
+
+      gtk_popover_set_relative_to (GTK_POPOVER (chooser), GTK_WIDGET (entry));
+      if (entry->priv->show_emoji_icon)
+        {
+          gtk_entry_get_icon_area (entry, GTK_ENTRY_ICON_SECONDARY, &rect);
+          gtk_popover_set_pointing_to (GTK_POPOVER (chooser), &rect);
+        }
+      g_signal_connect_swapped (chooser, "emoji-picked", G_CALLBACK (gtk_entry_enter_text), entry);
+    }
+
+  gtk_popover_popup (GTK_POPOVER (chooser));
+}
+
+static void
+pick_emoji (GtkEntry *entry,
+            int       icon,
+            GdkEvent *event,
+            gpointer  data)
+{
+  gtk_entry_choose_emoji (entry);
+}
+
+static void
+set_show_emoji_icon (GtkEntry *entry,
+                     gboolean  value)
+{
+  GtkEntryPrivate *priv = entry->priv;
+
+  if (priv->show_emoji_icon == value)
+    return;
+
+  priv->show_emoji_icon = value;
+
+  if (priv->show_emoji_icon)
+    {
+      gtk_entry_set_icon_from_icon_name (GTK_ENTRY (entry),
+                                         GTK_ENTRY_ICON_SECONDARY,
+                                         "face-smile-symbolic");
+
+      gtk_entry_set_icon_sensitive (GTK_ENTRY (entry),
+                                    GTK_ENTRY_ICON_SECONDARY,
+                                    TRUE);
+
+      gtk_entry_set_icon_activatable (GTK_ENTRY (entry),
+                                      GTK_ENTRY_ICON_SECONDARY,
+                                      TRUE);
+
+      g_signal_connect (entry, "icon-press", G_CALLBACK (pick_emoji), NULL);
+    }
+
+  g_object_notify_by_pspec (G_OBJECT (entry), entry_props[PROP_SHOW_EMOJI_ICON]);
+  gtk_widget_queue_resize (GTK_WIDGET (entry));
+}