zng_wgt_scroll

Enum ScrollFrom

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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§

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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.

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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.

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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§

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impl Clone for ScrollFrom

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fn clone(&self) -> ScrollFrom

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ScrollFrom

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'de> Deserialize<'de> for ScrollFrom

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Hash for ScrollFrom

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for ScrollFrom

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fn eq(&self, other: &ScrollFrom) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Serialize for ScrollFrom

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Copy for ScrollFrom

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impl StructuralPartialEq for ScrollFrom

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