[gnome-todo] gtd-sidebar-list-row: Add drag/drop handler

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit b8bf39f6f6394560753e8bbfb619b19248f0d895
Author: Jamie Murphy <hello jamiethalacker dev>
Date:   Tue Jun 28 13:18:50 2022 -0700

    gtd-sidebar-list-row: Add drag/drop handler

 .../task-lists-workspace/gtd-sidebar-list-row.c    | 69 ++++++++++++++++++++++
 1 file changed, 69 insertions(+)
---
diff --git a/src/plugins/task-lists-workspace/gtd-sidebar-list-row.c 
b/src/plugins/task-lists-workspace/gtd-sidebar-list-row.c
index a18b09c8..5919665f 100644
--- a/src/plugins/task-lists-workspace/gtd-sidebar-list-row.c
+++ b/src/plugins/task-lists-workspace/gtd-sidebar-list-row.c
@@ -135,6 +135,19 @@ set_list (GtdSidebarListRow *self,
  * Callbacks
  */
 
+static void
+on_import_task_cb (GObject      *object,
+                   GAsyncResult *result,
+                   gpointer      user_data)
+{
+  g_autoptr (GError) error = NULL;
+
+  gtd_task_list_import_task_finish (GTD_TASK_LIST (object), result, &error);
+
+  if (error)
+    g_warning ("Error updating task: %s", error->message);
+}
+
 static void
 on_list_changed_cb (GtdSidebarListRow *self)
 {
@@ -161,6 +174,53 @@ on_rename_popover_hidden_cb (GtkPopover        *popover,
   gtk_widget_set_parent (GTK_WIDGET (popover), NULL);
 }
 
+static gboolean
+on_task_drop (GtkDropTarget     *target,
+              const GValue      *value,
+              double             x,
+              double             y,
+              GtdSidebarListRow *self)
+{
+  GtdTask *task;
+
+  GTD_ENTRY;
+
+  task = g_value_get_object (value);
+  gtd_task_list_import_task (self->list,
+                             task,
+                             NULL,
+                             on_import_task_cb,
+                             self);
+
+  GTD_RETURN (TRUE);
+}
+
+
+static gboolean
+on_task_enter_drop (GtkDropTarget     *target,
+                    double             x,
+                    double             y,
+                    GtdSidebarListRow *self)
+{
+  GTD_ENTRY;
+  
+  gtk_widget_set_state_flags (GTK_WIDGET (self), GTK_STATE_FLAG_SELECTED , FALSE);
+
+  GTD_RETURN (TRUE);
+}
+
+static gboolean
+on_task_leave_drop (GtkDropTarget     *target,
+                    double             x,
+                    double             y,
+                    GtdSidebarListRow *self)
+{
+  GTD_ENTRY;
+  
+  gtk_widget_unset_state_flags (GTK_WIDGET (self), GTK_STATE_FLAG_SELECTED);
+
+  GTD_RETURN (TRUE);
+}
 
 /*
  * GObject overrides
@@ -244,7 +304,16 @@ gtd_sidebar_list_row_class_init (GtdSidebarListRowClass *klass)
 static void
 gtd_sidebar_list_row_init (GtdSidebarListRow *self)
 {
+  GtkDropTarget *target;
+
   gtk_widget_init_template (GTK_WIDGET (self));
+
+  target = gtk_drop_target_new (GTD_TYPE_TASK, GDK_ACTION_MOVE);
+  gtk_drop_target_set_preload (target, TRUE);
+  g_signal_connect (target, "drop", G_CALLBACK (on_task_drop), self);
+  g_signal_connect (target, "enter", G_CALLBACK (on_task_enter_drop), self);
+  g_signal_connect (target, "leave", G_CALLBACK (on_task_leave_drop), self);
+  gtk_widget_add_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (target));
 }
 
 GtkWidget*