Fragment Manager

Android-style fragment lifecycle and back-stack navigation via lv_fragment_manager_t.

Single fragment inside a container

Attach an lv_fragment_manager_t to a full-screen container and replace in one fragment.

A full-screen lv_obj_create acts as the root container. An lv_fragment_manager_t is created and wired to the root's LV_EVENT_DELETE so lv_fragment_manager_delete runs before the children go away. The custom class sample_cls stores a name string; lv_fragment_manager_replace swaps it in and its create_obj_cb builds a label that prints "Hello, Fragment!".

Push and pop fragment stack

Build a navigation stack where Push and Pop buttons drive lv_fragment_manager_push/pop.

A grid layout splits the screen into a content cell and two buttons labelled "Push" and "Pop". Each stacked fragment tracks its depth and a click counter, and its create_obj_cb builds a column with a depth label, a counter label, and a +1 button that updates the counter. "Push" calls lv_fragment_manager_push with the current stack size as the starting depth; "Pop" calls lv_fragment_manager_pop. The root's LV_EVENT_DELETE tears the manager down.