diff options
Diffstat (limited to 'native/src/widget/operation/scrollable.rs')
-rw-r--r-- | native/src/widget/operation/scrollable.rs | 30 |
1 files changed, 24 insertions, 6 deletions
diff --git a/native/src/widget/operation/scrollable.rs b/native/src/widget/operation/scrollable.rs index 6981b1f4..3b20631f 100644 --- a/native/src/widget/operation/scrollable.rs +++ b/native/src/widget/operation/scrollable.rs @@ -1,19 +1,18 @@ //! Operate on widgets that can be scrolled. use crate::widget::{Id, Operation}; -use iced_core::Point; /// The internal state of a widget that can be scrolled. pub trait Scrollable { /// Snaps the scroll of the widget to the given `percentage` along the horizontal & vertical axis. - fn snap_to(&mut self, percentage: Point); + fn snap_to(&mut self, offset: RelativeOffset); } /// Produces an [`Operation`] that snaps the widget with the given [`Id`] to /// the provided `percentage`. -pub fn snap_to<T>(target: Id, percentage: Point) -> impl Operation<T> { +pub fn snap_to<T>(target: Id, offset: RelativeOffset) -> impl Operation<T> { struct SnapTo { target: Id, - percentage: Point, + offset: RelativeOffset, } impl<T> Operation<T> for SnapTo { @@ -27,10 +26,29 @@ pub fn snap_to<T>(target: Id, percentage: Point) -> impl Operation<T> { fn scrollable(&mut self, state: &mut dyn Scrollable, id: Option<&Id>) { if Some(&self.target) == id { - state.snap_to(self.percentage); + state.snap_to(self.offset); } } } - SnapTo { target, percentage } + SnapTo { target, offset } +} + +/// The amount of offset in each direction of a [`Scrollable`]. +/// +/// A value of `0.0` means start, while `1.0` means end. +#[derive(Debug, Clone, Copy, PartialEq, Default)] +pub struct RelativeOffset { + /// The amount of horizontal offset + pub x: f32, + /// The amount of vertical offset + pub y: f32, +} + +impl RelativeOffset { + /// A relative offset that points to the top-left of a [`Scrollable`]. + pub const START: Self = Self { x: 0.0, y: 0.0 }; + + /// A relative offset that points to the bottom-right of a [`Scrollable`]. + pub const END: Self = Self { x: 1.0, y: 1.0 }; } |