Flutter-ovo renderiranje uključuje tri stabla — Widget stablo (konfiguracija), Element stablo (instancirani, upravljani widgeti) i RenderObject stablo (raspoređivanje i crtanje). Razumijevanje ovog cjevovoda demistificira kako Flutter učinkovito pretvara widgete u piksele.
Tri stabla
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
