Rendering Flutter melibatkan tiga pokok (tree) — Widget tree (konfigurasi), Element tree (widget yang diinstantiasi dan diuruskan), dan RenderObject tree (susun atur dan lukisan). Memahami pipeline ini menjelaskan cara Flutter dengan cekap menukar widget menjadi piksel.
Tiga pokok
WIDGET tree → immutable CONFIGURATION (what you write: the description of the UI)
→ cheap to create/recreate; rebuilt often (build() returns new widgets)
ELEMENT tree → the INSTANTIATED widgets; manages lifecycle and LINKS widgets to render
objects; PERSISTS across rebuilds (this is the key to efficiency)
RENDEROBJECT tree → does the actual LAYOUT, PAINTING, and hit-testing (the heavy objects)
→ expensive; REUSED and updated (not recreated) across rebuilds
