natiny.view.get_changed

natiny.view.get_changed(view) -> changed

Returns whether a view's rectangle is different from the one it had in the render before.

Parameters

Name	Type	Description
`view`	`number`	View handle

Returns

Type	Description
`boolean`	`true` when the position or the size changed, or this is the first render of the view

Example

-- rebuild an expensive picture only when its size changes
natiny.view.set_hook(map, natiny.view.HOOK_DRAW, function(self)
    local x, y, w, h = natiny.view.get_rect(self)
    if natiny.view.get_changed(self) then
        map_picture = build_map_picture(w, h)
    end
    natiny.render.texture(map_picture, x, y, w, h)
end)