mirror of
https://github.com/eliasstepanik/imgui-rs.git
synced 2026-01-12 05:58:35 +00:00
cc08285a04
1. Avoid calling step() in destructor - incorrect and unnecessary, as it is not required to fully "use" the clipper (you can stop rendering half-way through) 2. Add a harder to misuse iterator interface to the clipper as an alterantive to the C++ style .step() interface Closes #610
47 lines
1.8 KiB
Rust
47 lines
1.8 KiB
Rust
/// Demonstrates using the "list clipper" to efficiently display long
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/// lists in a scrolling area.
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///
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/// You specify the height per item, and the `ListClipper` API will
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/// provide which item index are visible. This avoids having to create
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/// thousands of items only for them to not be made visible.
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///
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/// Note this requires a fixed (or easily computable) height per item.
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use imgui::*;
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mod support;
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fn main() {
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let lots_of_words: Vec<String> = (0..10000).map(|x| format!("Line {}", x)).collect();
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let system = support::init(file!());
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system.main_loop(move |_, ui| {
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// Show the C++ style API
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ui.window("Hello long world")
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.size([100.0, 500.0], Condition::FirstUseEver)
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.position([10.0, 10.0], crate::Condition::Always)
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.build(|| {
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let mut clipper = imgui::ListClipper::new(lots_of_words.len() as i32)
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.items_height(ui.current_font_size())
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.begin(ui);
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while clipper.step() {
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for row_num in clipper.display_start()..clipper.display_end() {
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ui.text(&lots_of_words[row_num as usize]);
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}
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}
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});
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// Show the more Rust'y iterator
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ui.window("Hello long world (iterator API)")
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.size([100.0, 500.0], Condition::FirstUseEver)
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.position([150.0, 10.0], crate::Condition::Always)
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.build(|| {
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let clipper = imgui::ListClipper::new(lots_of_words.len() as i32)
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.items_height(ui.current_font_size())
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.begin(ui);
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for row_num in clipper.iter() {
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ui.text(&lots_of_words[row_num as usize]);
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}
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});
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});
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}
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