pub enum ScrollFrom {
Var(Px),
VarTarget(Px),
Rendered(Px),
}
Expand description
Defines a scroll delta and to what value source it is applied.
Scrolling can get out of sync depending on what moment and source the current scroll is read, the offset vars can be multiple frames ahead as update cycles have higher priority than render, some scrolling operations also target the value the smooth scrolling animation is animating too, this enum lets you specify from what scroll offset a delta must be computed.
Variants§
Var(Px)
Scroll amount added to the offset var current value, if smooth scrolling is enabled this
can be a partial value different from VarTarget
.
Operations that compute a scroll delta from the offset var must use this variant otherwise they will overshoot.
VarTarget(Px)
Scroll amount added to the value the offset var is animating too.
Operations that accumulate a delta (line-up/down) must use this variant otherwise they will undershoot.
This is the same as Var
if smooth scrolling is disabled.
Rendered(Px)
Scroll amount added to the offset already rendered, this can be different from the offset var as multiple events and updates can happen before a pending render is applied.
Operations that compute a scroll offset from widget bounds info must use this variant otherwise they will overshoot.
Trait Implementations§
source§impl Clone for ScrollFrom
impl Clone for ScrollFrom
source§fn clone(&self) -> ScrollFrom
fn clone(&self) -> ScrollFrom
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ScrollFrom
impl Debug for ScrollFrom
source§impl<'de> Deserialize<'de> for ScrollFrom
impl<'de> Deserialize<'de> for ScrollFrom
source§fn deserialize<__D>(
__deserializer: __D,
) -> Result<ScrollFrom, <__D as Deserializer<'de>>::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(
__deserializer: __D,
) -> Result<ScrollFrom, <__D as Deserializer<'de>>::Error>where
__D: Deserializer<'de>,
source§impl Hash for ScrollFrom
impl Hash for ScrollFrom
source§impl PartialEq for ScrollFrom
impl PartialEq for ScrollFrom
source§impl Serialize for ScrollFrom
impl Serialize for ScrollFrom
source§fn serialize<__S>(
&self,
__serializer: __S,
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
__S: Serializer,
fn serialize<__S>(
&self,
__serializer: __S,
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
__S: Serializer,
impl Copy for ScrollFrom
impl StructuralPartialEq for ScrollFrom
Auto Trait Implementations§
impl Freeze for ScrollFrom
impl RefUnwindSafe for ScrollFrom
impl Send for ScrollFrom
impl Sync for ScrollFrom
impl Unpin for ScrollFrom
impl UnwindSafe for ScrollFrom
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