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Merge pull request #30 from tpstevens/virtual-list-dnd
Added virtual list dnd example
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Original file line number | Diff line number | Diff line change |
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use eframe::egui; | ||
use eframe::epaint::Margin; | ||
use egui::{CentralPanel, Frame, Id, ScrollArea}; | ||
use egui_dnd::dnd; | ||
use egui_virtual_list::VirtualList; | ||
use rand::prelude::StdRng; | ||
use rand::{Rng, SeedableRng}; | ||
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pub fn main() -> eframe::Result<()> { | ||
let mut items: Vec<_> = (0..100000).collect(); | ||
let mut virtual_list = VirtualList::new(); | ||
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eframe::run_simple_native( | ||
"DnD Virtual List Example", | ||
Default::default(), | ||
move |ctx, _frame| { | ||
CentralPanel::default().show(ctx, |ui| { | ||
ScrollArea::vertical().show(ui, |ui| { | ||
let response = dnd(ui, "dnd").show_custom(|ui, iter| { | ||
virtual_list.ui_custom_layout(ui, items.len(), |ui, start_index| { | ||
let item = &items[start_index]; | ||
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iter.next( | ||
ui, | ||
Id::new(*item), // assumes that each item is a unique hash | ||
start_index, | ||
true, | ||
|ui, dnd_item| { | ||
dnd_item.ui(ui, |ui, handle, _item_state| { | ||
draw_item(ui, handle, item); | ||
}) | ||
}, | ||
); | ||
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1 | ||
}); | ||
}); | ||
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// Use update_vec() (or update your data structure yourself on every frame) for | ||
// smooth dragging and dropping, as updating based on response.final_update() | ||
// after dragging for a long time results in the dragged item failing to render | ||
// and the scroll area jumping slightly upon release | ||
response.update_vec(&mut items); | ||
}); | ||
}); | ||
}, | ||
) | ||
} | ||
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fn draw_item(ui: &mut egui::Ui, handle: egui_dnd::Handle, item: &i32) { | ||
// For the sake of the example we generate a random height based on the item index | ||
// but if your row height e.g. depends on some text with varying rows this would also work. | ||
let mut rng = StdRng::seed_from_u64(*item as u64); | ||
let height = rng.gen_range(0.0..=100.0); | ||
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Frame::canvas(ui.style()) | ||
.inner_margin(Margin::symmetric(16.0, 8.0 + height / 2.0)) | ||
.show(ui, |ui| { | ||
ui.set_width(ui.available_width()); | ||
handle.ui(ui, |ui| { | ||
ui.label(format!("Item {}", item)); | ||
}); | ||
}); | ||
} |