wip: Add async api to choose a font
This is an experiment to replace explicit use of chooser dialogs with an async API.
This commit is contained in:
Matthias Clasen
@@ -161,6 +161,31 @@ GDK_AVAILABLE_IN_ALL
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void gtk_font_chooser_set_language (GtkFontChooser *fontchooser,
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const char *language);
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typedef void (*GtkFontChooserPrepareCallback) (GtkFontChooser *chooser,
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gpointer user_data);
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GDK_AVAILABLE_IN_ALL
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void gtk_choose_font (GtkWindow *parent,
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const char *title,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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GDK_AVAILABLE_IN_ALL
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void gtk_choose_font_full (GtkWindow *parent,
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const char *title,
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GtkFontChooserPrepareCallback prepare,
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gpointer prepare_data,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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GDK_AVAILABLE_IN_ALL
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gboolean gtk_choose_font_finish (GtkFontChooser *chooser,
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GAsyncResult *result,
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GError **error);
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GtkFontChooser, g_object_unref)
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G_END_DECLS
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@@ -324,3 +324,127 @@ gtk_font_chooser_dialog_buildable_get_internal_child (GtkBuildable *buildable,
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return parent_buildable_iface->get_internal_child (buildable, builder, childname);
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}
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static void
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cancelled_cb (GCancellable *cancellable,
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GtkDialog *dialog)
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{
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gtk_dialog_response (dialog, GTK_RESPONSE_CANCEL);
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}
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static void
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response_cb (GtkDialog *dialog,
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int response,
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GTask *task)
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{
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GCancellable *cancellable = g_task_get_cancellable (task);
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if (cancellable)
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g_signal_handlers_disconnect_by_func (cancellable, cancelled_cb, dialog);
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if (response == GTK_RESPONSE_OK)
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g_task_return_boolean (task, TRUE);
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else
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g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_CANCELLED, "Cancelled");
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g_object_unref (task);
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gtk_window_destroy (GTK_WINDOW (dialog));
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}
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/**
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* gtk_choose_font:
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* @parent: (nullable): parent window
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* @title: title for the font chooser
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* @cancellable: (nullable): a `GCancellable` to cancel the operation
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* @callback: (scope async): callback to call when the action is complete
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* @user_data: (closure callback): data to pass to @callback
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*
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* This function presents a font chooser to let the user
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* pick a font.
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*
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* The @callback will be called when the dialog is closed.
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* It should call [function@Gtk.choose_font_finish] to
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* find out whether the operation was completed successfully,
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* and use [class@Gtk.FontChooser] API to obtain the results.
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*/
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void
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gtk_choose_font (GtkWindow *parent,
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const char *title,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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gtk_choose_font_full (parent, title, NULL, NULL, cancellable, callback, user_data);
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}
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/**
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* gtk_choose_font_full:
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* @parent: (nullable): parent window
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* @title: title for the font chooser
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* @prepare: (nullable) (scope call): callback to set up the font chooser
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* @prepare_data: (closure prepare): data to pass to @prepare
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* @cancellable: (nullable): a `GCancellable` to cancel the operation
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* @callback: (scope async): callback to call when the action is complete
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* @user_data: (closure callback): data to pass to @callback
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*
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* This function presents a font chooser to let the user
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* choose a font.
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*
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* In addition to [function@Gtk.choose_font], this function takes
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* a @prepare callback that lets you set up the font chooser according
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* to your needs.
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*
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* The @callback will be called when the dialog is closed.
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* It should use [function@Gtk.choose_font_finish] to find
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* out whether the operation was completed successfully,
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* and use [class@Gtk.FontChooser] API to obtain the results.
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*/
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void
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gtk_choose_font_full (GtkWindow *parent,
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const char *title,
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GtkFontChooserPrepareCallback prepare,
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gpointer prepare_data,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GtkWidget *dialog;
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GTask *task;
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dialog = gtk_font_chooser_dialog_new (title, parent);
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if (prepare)
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prepare (GTK_FONT_CHOOSER (dialog), prepare);
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if (cancellable)
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g_signal_connect (cancellable, "cancelled", G_CALLBACK (cancelled_cb), dialog);
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task = g_task_new (dialog, cancellable, callback, user_data);
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g_task_set_source_tag (task, gtk_choose_font_full);
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g_signal_connect (dialog, "response", G_CALLBACK (response_cb), task);
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gtk_window_present (GTK_WINDOW (dialog));
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}
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/**
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* gtk_choose_font_finish:
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* @chooser: the `GtkFontChooser`
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* @result: `GAsyncResult` that was passed to @callback
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* @error: return location for an error
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*
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* Finishes a gtk_choose_font() or gtk_choose_font_full() call
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* and returns whether the operation was successful.
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*
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* If this function returns `TRUE`, you can use
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* [class@Gtk.FontChooser] API to get the results.
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*
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* Returns: `TRUE` if the operation was successful
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*/
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gboolean
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gtk_choose_font_finish (GtkFontChooser *chooser,
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GAsyncResult *result,
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GError **error)
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{
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return g_task_propagate_boolean (G_TASK (result), error);
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}
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