[−][src]Struct druid::widget::EnvScope
A widget that accepts a closure to update the environment for its child.
Implementations
impl<T, W: Widget<T>> EnvScope<T, W>
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pub fn new(f: impl Fn(&mut Env, &T) + 'static, child: W) -> EnvScope<T, W>
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Create a widget that updates the environment for its descendants.
Accepts a closure that sets Env values.
This is available as WidgetExt::env_scope
for convenience.
Examples
EnvScope::new( |env, data| { env.set(theme::LABEL_COLOR, Color::WHITE); }, Label::new("White text!") )
Trait Implementations
impl<T: Data, W: Widget<T>> Widget<T> for EnvScope<T, W>
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pub fn event(
&mut self,
ctx: &mut EventCtx<'_, '_>,
event: &Event,
data: &mut T,
env: &Env
)
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&mut self,
ctx: &mut EventCtx<'_, '_>,
event: &Event,
data: &mut T,
env: &Env
)
pub fn lifecycle(
&mut self,
ctx: &mut LifeCycleCtx<'_, '_>,
event: &LifeCycle,
data: &T,
env: &Env
)
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&mut self,
ctx: &mut LifeCycleCtx<'_, '_>,
event: &LifeCycle,
data: &T,
env: &Env
)
pub fn update(
&mut self,
ctx: &mut UpdateCtx<'_, '_>,
_old_data: &T,
data: &T,
env: &Env
)
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&mut self,
ctx: &mut UpdateCtx<'_, '_>,
_old_data: &T,
data: &T,
env: &Env
)
pub fn layout(
&mut self,
ctx: &mut LayoutCtx<'_, '_>,
bc: &BoxConstraints,
data: &T,
env: &Env
) -> Size
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&mut self,
ctx: &mut LayoutCtx<'_, '_>,
bc: &BoxConstraints,
data: &T,
env: &Env
) -> Size
pub fn paint(&mut self, ctx: &mut PaintCtx<'_, '_, '_>, data: &T, env: &Env)
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Auto Trait Implementations
impl<T, W> !RefUnwindSafe for EnvScope<T, W>
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impl<T, W> !Send for EnvScope<T, W>
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impl<T, W> !Sync for EnvScope<T, W>
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impl<T, W> Unpin for EnvScope<T, W> where
T: Unpin,
W: Unpin,
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T: Unpin,
W: Unpin,
impl<T, W> !UnwindSafe for EnvScope<T, W>
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Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> RoundFrom<T> for T
pub fn round_from(x: T) -> T
impl<T, U> RoundInto<U> for T where
U: RoundFrom<T>,
U: RoundFrom<T>,
pub fn round_into(self) -> U
impl<T> Same<T> for T
type Output = T
Should always be Self
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,