app: Show the Export Image dialog on File -> Export...

Create a export dialog constructor in the dialog factory and invoke it
on File -> Export

app/actions/file-commands.c

@@ -78,8 +78,13 @@ static void     file_save_dialog_show        (Gimp                *gimp,
                                               const gchar         *title,
                                               gboolean             save_a_copy,
                                               gboolean             close_after_saving);
+static void     file_export_dialog_show      (Gimp                *gimp,
+                                              GimpImage           *image,
+                                              GtkWidget           *parent);
 static void     file_save_dialog_destroyed   (GtkWidget           *dialog,
                                               GimpImage           *image);
+static void     file_export_dialog_destroyed (GtkWidget           *dialog,
+                                              GimpImage           *image);
 static void     file_new_template_callback   (GtkWidget           *widget,
                                               const gchar         *name,
                                               gpointer             data);
@@ -274,6 +279,9 @@ file_save_cmd_callback (GtkAction *action,
       break;
 
     case GIMP_SAVE_MODE_EXPORT:
+      file_export_dialog_show (gimp, display->image, widget);
+      break;
+
     case GIMP_SAVE_MODE_EXPORT_TO:
       /* TODO */
       break;
@@ -528,6 +536,57 @@ file_save_dialog_destroyed (GtkWidget *dialog,
     g_object_set_data (G_OBJECT (image), "gimp-file-save-dialog", NULL);
 }
 
+static void
+file_export_dialog_show (Gimp      *gimp,
+                         GimpImage *image,
+                         GtkWidget *parent)
+{
+  GtkWidget *dialog;
+
+  dialog = g_object_get_data (G_OBJECT (image), "gimp-file-export-dialog");
+
+  if (! dialog)
+    {
+      dialog = gimp_dialog_factory_dialog_new (global_dialog_factory,
+                                               gtk_widget_get_screen (parent),
+                                               "gimp-file-export-dialog",
+                                               -1, FALSE);
+
+      if (dialog)
+        {
+          gtk_window_set_transient_for (GTK_WINDOW (dialog),
+                                        GTK_WINDOW (parent));
+
+          g_object_set_data_full (G_OBJECT (image),
+                                  "gimp-file-export-dialog", dialog,
+                                  (GDestroyNotify) gtk_widget_destroy);
+          g_signal_connect (dialog, "destroy",
+                            G_CALLBACK (file_export_dialog_destroyed),
+                            image);
+        }
+    }
+
+  if (dialog)
+    {
+      gimp_file_dialog_set_save_image (GIMP_FILE_DIALOG (dialog),
+                                       gimp,
+                                       image,
+                                       FALSE,
+                                       TRUE,
+                                       FALSE);
+
+      gtk_window_present (GTK_WINDOW (dialog));
+    }
+}
+
+static void
+file_export_dialog_destroyed (GtkWidget *dialog,
+                              GimpImage *image)
+{
+  if (GIMP_FILE_DIALOG (dialog)->image == image)
+    g_object_set_data (G_OBJECT (image), "gimp-file-export-dialog", NULL);
+}
+
 static void
 file_new_template_callback (GtkWidget   *widget,
                             const gchar *name,

app/dialogs/dialogs-constructors.c

@@ -128,6 +128,14 @@ dialogs_file_save_new (GimpDialogFactory *factory,
   return file_save_dialog_new (context->gimp, FALSE);
 }
 
+GtkWidget *
+dialogs_file_export_new (GimpDialogFactory *factory,
+                         GimpContext       *context,
+                         gint               view_size)
+{
+  return file_save_dialog_new (context->gimp, TRUE);
+}
+
 GtkWidget *
 dialogs_preferences_get (GimpDialogFactory *factory,
                          GimpContext       *context,

app/dialogs/dialogs-constructors.h

@@ -33,6 +33,9 @@ GtkWidget * dialogs_file_open_location_new (GimpDialogFactory *factory,
 GtkWidget * dialogs_file_save_new          (GimpDialogFactory *factory,
                                             GimpContext       *context,
                                             gint               view_size);
+GtkWidget * dialogs_file_export_new        (GimpDialogFactory *factory,
+                                            GimpContext       *context,
+                                            gint               view_size);
 GtkWidget * dialogs_preferences_get        (GimpDialogFactory *factory,
                                             GimpContext       *context,
                                             gint               view_size);

app/dialogs/dialogs.c

@@ -96,6 +96,8 @@ static const GimpDialogFactoryEntry toplevel_entries[] =
             dialogs_file_open_location_new, FALSE, TRUE, FALSE),
   TOPLEVEL ("gimp-file-save-dialog",
             dialogs_file_save_new,          FALSE, TRUE, TRUE),
+  TOPLEVEL ("gimp-file-export-dialog",
+            dialogs_file_export_new,        FALSE, TRUE, TRUE),
 
   /*  singleton toplevels  */
   TOPLEVEL ("gimp-preferences-dialog",