Struct conrod::widget::UpdateArgs
[−]
[src]
pub struct UpdateArgs<'a, 'b: 'a, 'c, 'd: 'c, W> where
W: Widget, { pub id: Id, pub maybe_parent_id: Option<Id>, pub prev: &'a CommonState, pub state: &'a mut State<'b, W::State>, pub rect: Rect, pub style: &'a W::Style, pub ui: &'c mut UiCell<'d>, }
Arguments for the Widget::update method in a struct to simplify the method signature.
Fields
id: Id
The Widget's unique index.
maybe_parent_id: Option<Id>
The Widget's parent unique index, if there is one.
prev: &'a CommonState
The Widget's previous state. Specifically, the state that is common between all widgets, such as positioning, floatability, draggability, etc.
state: &'a mut State<'b, W::State>
A wrapper around the Widget's unique state, providing methods for both immutably viewing and mutably updating the state.
We wrap mutation in a method so that we can keep track of whether or not the unique state has been updated.
If State::update is called, we assume that there has been some mutation and in turn will require re-drawing the Widget. Thus, it is recommended that you only call State::update if you need to update the unique state in some way.
rect: Rect
The rectangle describing the Widget's area.
style: &'a W::Style
The Widget's current Widget::Style.
ui: &'c mut UiCell<'d>
Restricted access to the Ui
.
Provides methods for immutably accessing the Ui
's Theme
and GlyphCache
. Also allows
calling Widget::set
within the Widget::update
method.