migrations/egui
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auto-shrink ScrollArea to content size

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Unless the user disables it with `ScollArea::auto_shrink([false; 2])`.
This commit is contained in:
Emil Ernerfeldt
2021-10-06 23:48:09 +02:00
parent a1bf5aff47
commit ce8d863249
3 changed files with 60 additions and 50 deletions
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78
egui_demo_lib/src/apps/demo/scrolling.rs
View File

@@ -32,7 +32,7 @@ impl super::Demo for Scrolling {
.open(open)
.resizable(false)
.show(ctx, |ui| {
use super::View;
use super::View as _;
self.ui(ui);
});
}
@@ -77,12 +77,17 @@ fn huge_content_lines(ui: &mut egui::Ui) {
let text_style = TextStyle::Body;
let row_height = ui.fonts()[text_style].row_height();
let num_rows = 10_000;
ScrollArea::vertical().show_rows(ui, row_height, num_rows, |ui, row_range| {
for row in row_range {
let text = format!("This is row {}/{}", row + 1, num_rows);
ui.label(text);
}
});
ScrollArea::vertical().auto_shrink([false; 2]).show_rows(
ui,
row_height,
num_rows,
|ui, row_range| {
for row in row_range {
let text = format!("This is row {}/{}", row + 1, num_rows);
ui.label(text);
}
},
);
}
fn huge_content_painter(ui: &mut egui::Ui) {
@@ -94,32 +99,39 @@ fn huge_content_painter(ui: &mut egui::Ui) {
let row_height = ui.fonts()[text_style].row_height() + ui.spacing().item_spacing.y;
let num_rows = 10_000;
ScrollArea::vertical().show_viewport(ui, |ui, viewport| {
ui.set_height(row_height * num_rows as f32);
ScrollArea::vertical()
.auto_shrink([false; 2])
.show_viewport(ui, |ui, viewport| {
ui.set_height(row_height * num_rows as f32);
let first_item = (viewport.min.y / row_height).floor().at_least(0.0) as usize;
let last_item = (viewport.max.y / row_height).ceil() as usize + 1;
let last_item = last_item.at_most(num_rows);
let first_item = (viewport.min.y / row_height).floor().at_least(0.0) as usize;
let last_item = (viewport.max.y / row_height).ceil() as usize + 1;
let last_item = last_item.at_most(num_rows);
for i in first_item..last_item {
let indentation = (i % 100) as f32;
let x = ui.min_rect().left() + indentation;
let y = ui.min_rect().top() + i as f32 * row_height;
let text = format!(
"This is row {}/{}, indented by {} pixels",
i + 1,
num_rows,
indentation
);
ui.painter().text(
pos2(x, y),
Align2::LEFT_TOP,
text,
text_style,
ui.visuals().text_color(),
);
}
});
let mut used_rect = Rect::NOTHING;
for i in first_item..last_item {
let indentation = (i % 100) as f32;
let x = ui.min_rect().left() + indentation;
let y = ui.min_rect().top() + i as f32 * row_height;
let text = format!(
"This is row {}/{}, indented by {} pixels",
i + 1,
num_rows,
indentation
);
let text_rect = ui.painter().text(
pos2(x, y),
Align2::LEFT_TOP,
text,
text_style,
ui.visuals().text_color(),
);
used_rect = used_rect.union(text_rect);
}
ui.allocate_rect(used_rect, Sense::hover()); // make sure it is visible!
});
}
// ----------------------------------------------------------------------------
@@ -184,7 +196,9 @@ impl super::View for ScrollTo {
scroll_bottom |= ui.button("Scroll to bottom").clicked();
});
let mut scroll_area = ScrollArea::vertical().max_height(200.0);
let mut scroll_area = ScrollArea::vertical()
.max_height(200.0)
.auto_shrink([false; 2]);
if go_to_scroll_offset {
scroll_area = scroll_area.scroll_offset(self.offset);
}