[−][src]Struct druid::widget::ViewSwitcher
A widget that dynamically switches between two children.
Implementations
impl<T: Data, U: Data> ViewSwitcher<T, U>
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pub fn new(
child_picker: impl Fn(&T, &Env) -> U + 'static,
child_builder: impl Fn(&U, &T, &Env) -> Box<dyn Widget<T>> + 'static
) -> Self
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child_picker: impl Fn(&T, &Env) -> U + 'static,
child_builder: impl Fn(&U, &T, &Env) -> Box<dyn Widget<T>> + 'static
) -> Self
Create a new view switcher.
The child_picker
closure is called every time the application data changes.
If the value it returns is the same as the one it returned during the previous
data change, nothing happens. If it returns a different value, then the
child_builder
closure is called with the new value.
The child_builder
closure creates a new child widget based on
the value passed to it.
Trait Implementations
impl<T: Data, U: Data> Widget<T> for ViewSwitcher<T, U>
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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, U> !RefUnwindSafe for ViewSwitcher<T, U>
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impl<T, U> !Send for ViewSwitcher<T, U>
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impl<T, U> !Sync for ViewSwitcher<T, U>
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impl<T, U> Unpin for ViewSwitcher<T, U> where
T: Unpin,
U: Unpin,
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T: Unpin,
U: Unpin,
impl<T, U> !UnwindSafe for ViewSwitcher<T, U>
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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>,