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Draw scrollbar in Widget::draw for Scrollable

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This commit is contained in:
Héctor Ramón Jiménez 2021-10-18 14:48:33 +07:00
parent a4f4d83161
commit 54a9a232f8
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GPG key ID: 140CC052C94F138E
11 changed files with 132 additions and 196 deletions
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64
graphics/src/widget/scrollable.rs
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@ -1,7 +1,5 @@
//! Navigate an endless amount of content with a scrollbar.
use crate::{Backend, Renderer};
use iced_native::scrollable;
use iced_native::Rectangle;
use crate::Renderer;
pub use iced_native::scrollable::State;
pub use iced_style::scrollable::{Scrollbar, Scroller, StyleSheet};
@ -13,63 +11,3 @@ pub use iced_style::scrollable::{Scrollbar, Scroller, StyleSheet};
/// `Renderer`.
pub type Scrollable<'a, Message, Backend> =
iced_native::Scrollable<'a, Message, Renderer<Backend>>;
impl<B> scrollable::Renderer for Renderer<B>
where
B: Backend,
{
type Style = Box<dyn iced_style::scrollable::StyleSheet>;
fn scrollbar(
&self,
bounds: Rectangle,
content_bounds: Rectangle,
offset: u32,
scrollbar_width: u16,
scrollbar_margin: u16,
scroller_width: u16,
) -> Option<scrollable::Scrollbar> {
if content_bounds.height > bounds.height {
let outer_width =
scrollbar_width.max(scroller_width) + 2 * scrollbar_margin;
let outer_bounds = Rectangle {
x: bounds.x + bounds.width - outer_width as f32,
y: bounds.y,
width: outer_width as f32,
height: bounds.height,
};
let scrollbar_bounds = Rectangle {
x: bounds.x + bounds.width
- f32::from(outer_width / 2 + scrollbar_width / 2),
y: bounds.y,
width: scrollbar_width as f32,
height: bounds.height,
};
let ratio = bounds.height / content_bounds.height;
let scroller_height = bounds.height * ratio;
let y_offset = offset as f32 * ratio;
let scroller_bounds = Rectangle {
x: bounds.x + bounds.width
- f32::from(outer_width / 2 + scroller_width / 2),
y: scrollbar_bounds.y + y_offset,
width: scroller_width as f32,
height: scroller_height,
};
Some(scrollable::Scrollbar {
outer_bounds,
bounds: scrollbar_bounds,
margin: scrollbar_margin,
scroller: scrollable::Scroller {
bounds: scroller_bounds,
},
})
} else {
None
}
}
}