gtkWidgetKeynavFailed: gtkWidgetKeynavFailed

Description Usage Arguments Details Value Author(s)

View source: R/gtkFuncs.R

Description

This function should be called whenever keyboard navigation within a single widget hits a boundary. The function emits the gtkWidgetKeynavFailed signal on the widget and its return value should be interpreted in a way similar to the return value of gtkWidgetChildFocus:

Usage

1
gtkWidgetKeynavFailed(object, direction)

Arguments

object

a GtkWidget

direction

direction of focus movement

Details

When TRUE is returned, stay in the widget, the failed keyboard navigation is Ok and/or there is nowhere we can/should move the focus to.

When FALSE is returned, the caller should continue with keyboard navigation outside the widget, e.g. by calling gtkWidgetChildFocus on the widget's toplevel.

The default ::keynav-failed handler returns TRUE for GTK_DIR_TAB_FORWARD and GTK_DIR_TAB_BACKWARD. For the other values of GtkDirectionType, it looks at the "gtk-keynav-cursor-only" setting and returns FALSE if the setting is TRUE. This way the entire user interface becomes cursor-navigatable on input devices such as mobile phones which only have cursor keys but no tab key.

Whenever the default handler returns TRUE, it also calls gtkWidgetErrorBell to notify the user of the failed keyboard navigation.

A use case for providing an own implementation of ::keynav-failed (either by connecting to it or by overriding it) would be a row of GtkEntry widgets where the user should be able to navigate the entire row with the cursor keys, as e.g. known from user interfaces that require entering license keys. Since 2.12

Value

[logical] TRUE if stopping keyboard navigation is fine, FALSE if the emitting widget should try to handle the keyboard navigation attempt in its parent container(s).

Author(s)

Derived by RGtkGen from GTK+ documentation


RGtk2 documentation built on June 12, 2018, 5:06 p.m.