如何在GTK +中找到给定方向的下一个小部件？

Question

I want to find out which widget is in a given direction in GTK+, ie doing what the "move-focus" signal does, but without actually changing the focus. What I have in mind is a function that takes a GtkWidget * and a GtkDirectionType and returns the GtkWidget in the given direction (if any).

What I want this for is to ultimately enumerate the widgets inside a specific GtkFrame in my UI definition, in order from left to right. Ie basically create a list of widgets from leftmost to rightmost, inside my GtkFrame (or in the general case, inside any container).

I've tried to search the GTK documentation but haven't found anything that doesn't also change focus.

Answer 1

Failing any other approach, the way I'm going forward with is to copy a selected set of static functions from the library implementation of GtkContainer and put them in a file in my own application, modifying them to suit my needs.

More specifically, the function gtk_container_focus_sort_left_right() and any local functions that it depends on. This includes the GCompareFunc left_right_compare() and get_allocation_coords().

Answer 2

假设您关心的方向是“前进”和“后退”，这听起来像您想在框架上使用gtk_container_get_focus_chain() ：它几乎完成了上面所说的：按焦点顺序获得小部件列表跳动时。