101 lines
3.4 KiB
Rust
101 lines
3.4 KiB
Rust
use crate::{Primitive, Renderer};
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use iced_native::{
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scrollable, Background, MouseCursor, Point, Rectangle, Vector,
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};
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const SCROLLBAR_WIDTH: u16 = 10;
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const SCROLLBAR_MARGIN: u16 = 2;
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fn scrollbar_bounds(bounds: Rectangle) -> Rectangle {
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Rectangle {
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x: bounds.x + bounds.width
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- f32::from(SCROLLBAR_WIDTH + 2 * SCROLLBAR_MARGIN),
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y: bounds.y,
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width: f32::from(SCROLLBAR_WIDTH + 2 * SCROLLBAR_MARGIN),
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height: bounds.height,
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}
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}
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impl scrollable::Renderer for Renderer {
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fn is_mouse_over_scrollbar(
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&self,
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bounds: Rectangle,
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content_bounds: Rectangle,
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cursor_position: Point,
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) -> bool {
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content_bounds.height > bounds.height
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&& scrollbar_bounds(bounds).contains(cursor_position)
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}
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fn draw(
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&mut self,
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state: &scrollable::State,
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bounds: Rectangle,
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content_bounds: Rectangle,
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is_mouse_over: bool,
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is_mouse_over_scrollbar: bool,
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offset: u32,
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(content, mouse_cursor): Self::Output,
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) -> Self::Output {
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let is_content_overflowing = content_bounds.height > bounds.height;
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let scrollbar_bounds = scrollbar_bounds(bounds);
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let clip = Primitive::Clip {
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bounds,
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offset: Vector::new(0, offset),
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content: Box::new(content),
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};
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(
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if is_content_overflowing
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&& (is_mouse_over || state.is_scrollbar_grabbed())
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{
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let ratio = bounds.height / content_bounds.height;
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let scrollbar_height = bounds.height * ratio;
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let y_offset = offset as f32 * ratio;
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let scrollbar = Primitive::Quad {
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bounds: Rectangle {
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x: scrollbar_bounds.x + f32::from(SCROLLBAR_MARGIN),
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y: scrollbar_bounds.y + y_offset,
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width: scrollbar_bounds.width
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- f32::from(2 * SCROLLBAR_MARGIN),
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height: scrollbar_height,
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},
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background: Background::Color([0.0, 0.0, 0.0, 0.7].into()),
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border_radius: 5,
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};
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if is_mouse_over_scrollbar || state.is_scrollbar_grabbed() {
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let scrollbar_background = Primitive::Quad {
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bounds: Rectangle {
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x: scrollbar_bounds.x + f32::from(SCROLLBAR_MARGIN),
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width: scrollbar_bounds.width
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- f32::from(2 * SCROLLBAR_MARGIN),
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..scrollbar_bounds
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},
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background: Background::Color(
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[0.0, 0.0, 0.0, 0.3].into(),
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),
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border_radius: 5,
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};
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Primitive::Group {
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primitives: vec![clip, scrollbar_background, scrollbar],
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}
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} else {
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Primitive::Group {
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primitives: vec![clip, scrollbar],
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}
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}
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} else {
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clip
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},
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if is_mouse_over_scrollbar || state.is_scrollbar_grabbed() {
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MouseCursor::Idle
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} else {
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mouse_cursor
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},
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)
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}
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}
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