Enum AppearanceChange 

#[non_exhaustive]
pub enum AppearanceChange {
    Fill {
        old: Option<ColorProp>,
        new: Option<ColorProp>,
    },
    Stroke {
        old: Option<(ColorProp, StrokeStyle)>,
        new: Option<(ColorProp, StrokeStyle)>,
    },
}

Which paint-only appearance slot changed, with both sides of the write.

One variant per slot rather than one struct carrying both, because a write touches exactly one of them and a struct would have to invent a value for the other — which is the class of “plausible but wrong” data a journal must not contain.

#[non_exhaustive]: this crate has out-of-tree consumers, and an item may grow a third appearance slot.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Fill

Scene::set_item_fill / Scene::clear_item_fill. None on either side means “no fill”.

Fields

old: Option<ColorProp>

The fill the item held before the write.

new: Option<ColorProp>

The fill it holds now.

Stroke

Scene::set_item_stroke / Scene::clear_item_stroke. None on either side means “no stroke”.

Fields

old: Option<(ColorProp, StrokeStyle)>

The stroke the item held before the write.

new: Option<(ColorProp, StrokeStyle)>

The stroke it holds now.

Trait Implementations

impl Clone for AppearanceChange

fn clone(&self) -> AppearanceChange

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for AppearanceChange

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

Formats the value using the given formatter.