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Expose methods to change viewport alignment #1953

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merged 3 commits into from
Jul 13, 2023
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Merged

Expose methods to change viewport alignment #1953

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11287c8
Expose methods to change viewport alignment
tarkah Jul 12, 2023
a9987cb
Introduce `absolute_offset_reversed` to `scrollable::Viewport`
hecrj Jul 13, 2023
d367584
Avoid redundant `max` in `absolute_offset_reversed`
hecrj Jul 13, 2023
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16 changes: 16 additions & 0 deletions widget/src/scrollable.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1095,6 +1095,22 @@ impl Viewport {
AbsoluteOffset { x, y }
}

/// Returns the [`AbsoluteOffset`] of the current [`Viewport`], but with its
/// alignment reversed.
///
/// This method can be useful to switch the alignment of a [`Scrollable`]
/// while maintaining its scrolling position.
pub fn absolute_offset_reversed(&self) -> AbsoluteOffset {
let AbsoluteOffset { x, y } = self.absolute_offset();

AbsoluteOffset {
x: ((self.content_bounds.width - self.bounds.width).max(0.0) - x)
.max(0.0),
y: ((self.content_bounds.height - self.bounds.height).max(0.0) - y)
.max(0.0),
}
}

/// Returns the [`RelativeOffset`] of the current [`Viewport`].
pub fn relative_offset(&self) -> RelativeOffset {
let AbsoluteOffset { x, y } = self.absolute_offset();
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