65 lines
1.9 KiB
Rust
65 lines
1.9 KiB
Rust
use iris::prelude::*;
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const ROWS: usize = 800;
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const IMAGE_EVERY: usize = 12;
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fn row_text(i: usize) -> String {
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const SENTENCE: &str =
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"Iris lays out this row once and moves it on scroll, never re-laying it out. ";
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let repeats = 1 + (i * 7) % 5;
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format!("Message {i}: {}", SENTENCE.repeat(repeats))
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}
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fn row_image(i: usize) -> iris::image::DynamicImage {
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let hue = ((i * 47) % 255) as u8;
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iris::image::RgbaImage::from_pixel(48, 48, iris::image::Rgba([hue, 128, 255 - hue, 255])).into()
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}
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fn build_row<Rsc: UiRsc + 'static>(rsc: &mut Rsc, i: usize) -> StrongWidget {
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let tint = if i.is_multiple_of(2) {
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Srgba8::rgb(120, 130, 170)
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} else {
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Srgba8::rgb(70, 80, 140)
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};
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let text_color = PaintId::BLACK;
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if i.is_multiple_of(IMAGE_EVERY) {
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let text = wtext(row_text(i))
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.overflow(TextOverflow::Wrap)
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.color(text_color)
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.add_strong(rsc)
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.any();
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let img = image::<Rsc>(row_image(i))(rsc);
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let img = rsc.widgets_mut().add_strong(img).any();
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let mut span = Span::empty(Dir::DOWN);
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span.push(text);
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span.push(img);
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span.pad(dp(8.0))
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.background(rect(tint))
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.add_strong(rsc)
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.any()
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} else {
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wtext(row_text(i))
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.overflow(TextOverflow::Wrap)
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.color(text_color)
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.pad(dp(8.0))
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.background(rect(tint))
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.add_strong(rsc)
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.any()
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}
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}
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pub(crate) fn build<Rsc: HasEvents>(rsc: &mut Rsc, ui_state: &mut impl HasRoot<Rsc>) {
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let mut list = LazySpan::new(Dir::DOWN, Pin::End);
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for i in 0..ROWS {
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let row = build_row(rsc, i);
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list.push_back(LazyItem::new(i as u64, row));
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}
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let root = list
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.scrollable()
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.masked()
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.background(rect(PaintId::WHITE))
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.add_strong(rsc);
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ui_state.set_root(rsc, root.any());
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}
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