Add an "Open With" context menu to browser items

fastiv-browser.c

@@ -432,6 +432,167 @@ reload_thumbnails(FastivBrowser *self)
 	gtk_widget_queue_resize(GTK_WIDGET(self));
 }
 
+// --- Context menu-------------------------------------------------------------
+
+typedef struct _OpenContext {
+	GWeakRef widget;
+	GFile *file;
+	char *content_type;
+	GAppInfo *app_info;
+} OpenContext;
+
+static void
+open_context_notify(gpointer data, G_GNUC_UNUSED GClosure *closure)
+{
+	OpenContext *self = data;
+	g_weak_ref_clear(&self->widget);
+	g_clear_object(&self->app_info);
+	g_clear_object(&self->file);
+	g_free(self->content_type);
+	g_free(self);
+}
+
+static void
+open_context_launch(GtkWidget *widget, OpenContext *self)
+{
+	GdkAppLaunchContext *context =
+		gdk_display_get_app_launch_context(gtk_widget_get_display(widget));
+	gdk_app_launch_context_set_screen(context, gtk_widget_get_screen(widget));
+	gdk_app_launch_context_set_timestamp(context, gtk_get_current_event_time());
+
+	// TODO(p): Display errors.
+	GList *files = g_list_append(NULL, self->file);
+	if (g_app_info_launch(
+			self->app_info, files, G_APP_LAUNCH_CONTEXT(context), NULL)) {
+		g_app_info_set_as_last_used_for_type(
+			self->app_info, self->content_type, NULL);
+	}
+	g_list_free(files);
+	g_object_unref(context);
+}
+
+static void
+append_opener(GtkWidget *menu, GAppInfo *opener, const OpenContext *template)
+{
+	OpenContext *ctx = g_malloc0(sizeof *ctx);
+	g_weak_ref_init(&ctx->widget, NULL);
+	ctx->file = g_object_ref(template->file);
+	ctx->content_type = g_strdup(template->content_type);
+	ctx->app_info = opener;
+
+	// It's documented that we can touch the child, if we want formatting:
+	// https://docs.gtk.org/gtk3/class.MenuItem.html
+	// XXX: Would g_app_info_get_display_name() be any better?
+	gchar *name = g_strdup_printf("Open With %s", g_app_info_get_name(opener));
+	GtkWidget *item = gtk_menu_item_new_with_label(name);
+	g_free(name);
+	g_signal_connect_data(item, "activate", G_CALLBACK(open_context_launch),
+		ctx, open_context_notify, 0);
+	gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
+}
+
+static void
+on_chooser_activate(GtkMenuItem *item, gpointer user_data)
+{
+	OpenContext *ctx = user_data;
+	GtkWindow *window = NULL;
+	GtkWidget *widget = g_weak_ref_get(&ctx->widget);
+	if (widget) {
+		if (GTK_IS_WINDOW((widget = gtk_widget_get_toplevel(widget))))
+			window = GTK_WINDOW(widget);
+	}
+
+	GtkWidget *dialog = gtk_app_chooser_dialog_new_for_content_type(window,
+		GTK_DIALOG_DESTROY_WITH_PARENT | GTK_DIALOG_MODAL, ctx->content_type);
+	if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_OK) {
+		ctx->app_info = gtk_app_chooser_get_app_info(GTK_APP_CHOOSER(dialog));
+		open_context_launch(GTK_WIDGET(item), ctx);
+	}
+	gtk_widget_destroy(dialog);
+}
+
+static gboolean
+destroy_widget_idle_source_func(GtkWidget *widget)
+{
+	// The whole menu is deactivated /before/ any item is activated,
+	// and a destroyed child item will not activate.
+	gtk_widget_destroy(widget);
+	return FALSE;
+}
+
+static void
+show_context_menu(GtkWidget *widget, const char *filename)
+{
+	GFile *file = g_file_new_for_path(filename);
+	GFileInfo *info = g_file_query_info(file,
+		G_FILE_ATTRIBUTE_STANDARD_NAME
+		"," G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
+		G_FILE_QUERY_INFO_NONE, NULL, NULL);
+	if (!info) {
+		g_object_unref(file);
+		return;
+	}
+
+	// This will have no application pre-assigned, for use with GTK+'s dialog.
+	OpenContext *ctx = g_malloc0(sizeof *ctx);
+	g_weak_ref_init(&ctx->widget, widget);
+	ctx->file = file;
+	ctx->content_type = g_strdup(g_file_info_get_content_type(info));
+	g_object_unref(info);
+
+	GAppInfo *default_ =
+		g_app_info_get_default_for_type(ctx->content_type, FALSE);
+	GList *recommended = g_app_info_get_recommended_for_type(ctx->content_type);
+	GList *fallback = g_app_info_get_fallback_for_type(ctx->content_type);
+
+	GtkWidget *menu = gtk_menu_new();
+	if (default_) {
+		append_opener(menu, default_, ctx);
+		gtk_menu_shell_append(
+			GTK_MENU_SHELL(menu), gtk_separator_menu_item_new());
+	}
+
+	for (GList *iter = recommended; iter; iter = iter->next) {
+		if (g_app_info_should_show(iter->data) &&
+			(!default_ || !g_app_info_equal(iter->data, default_)))
+			append_opener(menu, iter->data, ctx);
+		else
+			g_object_unref(iter->data);
+	}
+	if (recommended) {
+		g_list_free(recommended);
+		gtk_menu_shell_append(
+			GTK_MENU_SHELL(menu), gtk_separator_menu_item_new());
+	}
+
+	for (GList *iter = fallback; iter; iter = iter->next) {
+		if (g_app_info_should_show(iter->data) &&
+			(!default_ || !g_app_info_equal(iter->data, default_)))
+			append_opener(menu, iter->data, ctx);
+		else
+			g_object_unref(iter->data);
+	}
+	if (fallback) {
+		g_list_free(fallback);
+		gtk_menu_shell_append(
+			GTK_MENU_SHELL(menu), gtk_separator_menu_item_new());
+	}
+
+	GtkWidget *item = gtk_menu_item_new_with_label("Open With...");
+	g_signal_connect_data(item, "activate", G_CALLBACK(on_chooser_activate),
+		ctx, open_context_notify, 0);
+	gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
+
+	// As per GTK+ 3 Common Questions, 1.5.
+	g_object_ref_sink(menu);
+	g_signal_connect_swapped(menu, "deactivate",
+		G_CALLBACK(g_idle_add), destroy_widget_idle_source_func);
+	g_signal_connect(menu, "destroy", G_CALLBACK(g_object_unref), NULL);
+
+	gtk_widget_show_all(menu);
+	gtk_menu_popup_at_pointer(GTK_MENU(menu), NULL);
+}
+
 // --- Boilerplate -------------------------------------------------------------
 
 // TODO(p): For proper navigation, we need to implement GtkScrollable.
@@ -653,8 +814,11 @@ fastiv_browser_button_press_event(GtkWidget *widget, GdkEventButton *event)
 			return open_entry(widget, entry, TRUE);
 		return FALSE;
 	case GDK_BUTTON_SECONDARY:
-		// TODO(p): Context menu.
+		// On X11, after closing the menu, the pointer otherwise remains,
-		return FALSE;
+		// no matter what its new location is.
+		gdk_window_set_cursor(gtk_widget_get_window(widget), NULL);
+		show_context_menu(widget, entry->filename);
+		return TRUE;
 	default:
 		return FALSE;
 	}

fastiv.c

@@ -438,10 +438,8 @@ on_key_press(G_GNUC_UNUSED GtkWidget *widget, GdkEventKey *event,
 			return TRUE;
 
 		case GDK_KEY_F9:
-			if (gtk_widget_is_visible(g.browser_sidebar))
+			gtk_widget_set_visible(g.browser_sidebar,
-				gtk_widget_hide(g.browser_sidebar);
+				!gtk_widget_is_visible(g.browser_sidebar));
-			else
-				gtk_widget_show(g.browser_sidebar);
 			return TRUE;
 
 		case GDK_KEY_F11: