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|
//! Navigate an endless amount of content with a scrollbar.
use crate::{Backend, Primitive, Renderer};
use iced_native::mouse;
use iced_native::scrollable;
use iced_native::{Background, Color, Rectangle, Vector};
pub use iced_native::scrollable::State;
pub use iced_style::scrollable::{Scrollbar, Scroller, StyleSheet};
/// A widget that can vertically display an infinite amount of content
/// with a scrollbar.
///
/// This is an alias of an `iced_native` scrollable with a default
/// `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
}
}
fn draw(
&mut self,
state: &scrollable::State,
bounds: Rectangle,
_content_bounds: Rectangle,
is_mouse_over: bool,
is_mouse_over_scrollbar: bool,
scrollbar: Option<scrollable::Scrollbar>,
offset: u32,
style_sheet: &Self::Style,
(content, mouse_interaction): Self::Output,
) -> Self::Output {
(
if let Some(scrollbar) = scrollbar {
let clip = Primitive::Clip {
bounds,
offset: Vector::new(0, offset),
content: Box::new(content),
};
let style = if state.is_scroller_grabbed() {
style_sheet.dragging()
} else if is_mouse_over_scrollbar {
style_sheet.hovered()
} else {
style_sheet.active()
};
let is_scrollbar_visible =
style.background.is_some() || style.border_width > 0.0;
let scroller = if is_mouse_over
|| state.is_scroller_grabbed()
|| is_scrollbar_visible
{
Primitive::Quad {
bounds: scrollbar.scroller.bounds,
background: Background::Color(style.scroller.color),
border_radius: style.scroller.border_radius,
border_width: style.scroller.border_width,
border_color: style.scroller.border_color,
}
} else {
Primitive::None
};
let scrollbar = if is_scrollbar_visible {
Primitive::Quad {
bounds: scrollbar.bounds,
background: style
.background
.unwrap_or(Background::Color(Color::TRANSPARENT)),
border_radius: style.border_radius,
border_width: style.border_width,
border_color: style.border_color,
}
} else {
Primitive::None
};
let scroll = Primitive::Clip {
bounds,
offset: Vector::new(0, 0),
content: Box::new(Primitive::Group {
primitives: vec![scrollbar, scroller],
}),
};
Primitive::Group {
primitives: vec![clip, scroll],
}
} else {
content
},
if is_mouse_over_scrollbar || state.is_scroller_grabbed() {
mouse::Interaction::Idle
} else {
mouse_interaction
},
)
}
}
|
