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use eframe::NativeOptions;
use egui::{Align2, Button, CentralPanel, ComboBox, Frame, Label};
use egui_flex::{
Flex, FlexAlign, FlexAlignContent, FlexDirection, FlexInstance, FlexItem, FlexJustify, item,
};
use std::num::NonZeroUsize;
const ALIGNS: [Align2; 9] = [
Align2::LEFT_TOP,
Align2::CENTER_TOP,
Align2::RIGHT_TOP,
Align2::LEFT_CENTER,
Align2::CENTER_CENTER,
Align2::RIGHT_CENTER,
Align2::LEFT_BOTTOM,
Align2::CENTER_BOTTOM,
Align2::RIGHT_BOTTOM,
];
#[allow(clippy::too_many_lines)] // It's an example
fn main() -> eframe::Result {
let mut demo_dir = FlexDirection::Horizontal;
let mut grow = false;
let mut align_self_content: usize = 0;
eframe::run_ui_native(
"egui_flex demos",
NativeOptions::default(),
move |ui, _frame| {
ui.ctx().options_mut(|opts| {
opts.max_passes = NonZeroUsize::new(3).unwrap();
});
CentralPanel::default().show_inside(ui, |ui| {
let frame = Frame::group(ui.style());
Flex::new().w_full().show(ui, |flex| {
flex.add_ui(FlexItem::new(), |ui| {
ui.label("Demo direction:");
});
if flex
.add(
FlexItem::new(),
Button::new("Horizontal")
.selected(demo_dir == FlexDirection::Horizontal),
)
.clicked()
{
demo_dir = FlexDirection::Horizontal;
}
if flex
.add(
FlexItem::new(),
Button::new("Vertical").selected(demo_dir == FlexDirection::Vertical),
)
.clicked()
{
demo_dir = FlexDirection::Vertical;
}
flex.add_ui(FlexItem::new(), |ui| ui.checkbox(&mut grow, "Grow"));
});
let main_dir = if demo_dir == FlexDirection::Horizontal {
FlexDirection::Vertical
} else {
FlexDirection::Horizontal
};
let grow_items = if grow { 1.0 } else { 0.0 };
let heading = |flex: &mut FlexInstance, heading| {
flex.add_ui(FlexItem::new().grow(0.0), |ui| {
ui.heading(heading);
});
};
Flex::new()
.direction(main_dir)
.align_content(FlexAlignContent::Start)
.grow_items(1.0)
.wrap(true)
.show(ui, |flex| {
flex.add_flex(
FlexItem::new().frame(frame),
Flex::new().direction(demo_dir).grow_items(grow_items),
|flex| {
heading(flex, "Align");
for align in &[
FlexAlign::Start,
FlexAlign::Center,
FlexAlign::End,
FlexAlign::Stretch,
] {
flex.add_ui(
FlexItem::new().align_self(*align).frame(frame),
|ui| {
ui.label(format!("{align:?}"));
},
);
}
flex.add_ui(FlexItem::new().frame(frame), |ui| {
ui.label("Some bigger item\nwith some\nmore lines")
});
},
);
flex.add_flex(
FlexItem::new().frame(frame),
Flex::new().w_full().h_full().direction(demo_dir),
|flex| {
heading(flex, "Grow");
for grow in &[0.0, 1.0, 2.0, 3.0] {
flex.add_ui(FlexItem::new().grow(*grow).frame(frame), |ui| {
ui.label(format!("{grow:?}"));
});
}
},
);
flex.add_flex(
FlexItem::new().frame(frame),
Flex::new().direction(demo_dir).grow_items(grow_items),
|flex| {
heading(flex, "Basis");
for basis in &[0.0, 50.0, 100.0, 200.0] {
flex.add_ui(FlexItem::new().basis(*basis).frame(frame), |ui| {
ui.label(format!("{basis:?}"));
});
}
},
);
flex.add_flex(
FlexItem::new().frame(frame),
Flex::new().direction(demo_dir).grow_items(grow_items),
|flex| {
heading(flex, "Justify Content");
flex.add_flex(
item().grow(1.0).frame(frame),
Flex::new()
.direction(main_dir)
.grow_items(grow_items)
.align_items(FlexAlign::Stretch),
|flex| {
for justify in &[
FlexJustify::Start,
FlexJustify::Center,
FlexJustify::End,
FlexJustify::SpaceBetween,
FlexJustify::SpaceAround,
FlexJustify::SpaceEvenly,
] {
flex.add_flex(
FlexItem::new().frame(frame),
Flex::new().direction(demo_dir).justify(*justify),
|flex| {
flex.add(
item(),
Label::new(format!("{justify:?}")),
);
flex.add(item(), Label::new("two"));
flex.add(item(), Label::new("three"));
},
);
}
},
);
},
);
flex.add_flex(
FlexItem::new().frame(frame),
Flex::new().direction(demo_dir).grow_items(grow_items),
|flex| {
heading(flex, "Nested");
flex.add_flex(
FlexItem::new().frame(frame),
Flex::new().direction(main_dir).grow_items(grow_items),
|flex| {
flex.add_ui(FlexItem::new().frame(frame), |ui| {
ui.label("one");
});
flex.add_flex(
FlexItem::new().frame(frame),
Flex::new().direction(demo_dir).grow_items(grow_items),
|flex| {
flex.add_ui(FlexItem::new().frame(frame), |ui| {
ui.label("two");
});
flex.add_ui(FlexItem::new().frame(frame), |ui| {
ui.label("three");
});
},
);
},
);
flex.add_flex(
FlexItem::new().frame(frame),
Flex::new().direction(main_dir).grow_items(grow_items),
|flex| {
flex.add_ui(FlexItem::new().frame(frame), |ui| {
ui.label("one");
});
flex.add_ui(FlexItem::new().frame(frame), |ui| {
ui.label("two");
});
flex.add_ui(FlexItem::new().frame(frame), |ui| {
ui.label("three");
});
},
);
},
);
flex.add_flex(
FlexItem::new().frame(frame),
Flex::new().direction(demo_dir).grow_items(grow_items),
|flex| {
heading(flex, "Align Self Content");
flex.add_ui(FlexItem::new(), |ui| {
ComboBox::new("self content", "").show_index(
ui,
&mut align_self_content,
ALIGNS.len(),
|index| format!("{:?}", ALIGNS[index]),
);
});
let align_content = ALIGNS[align_self_content];
for align in &[
FlexAlign::Start,
FlexAlign::Center,
FlexAlign::End,
FlexAlign::Stretch,
] {
flex.add_ui(
FlexItem::new()
.align_self(*align)
.align_self_content(align_content)
.frame(frame),
|ui| {
ui.label(format!("{align:?}"));
},
);
}
flex.add_ui(FlexItem::new().frame(frame), |ui| {
ui.label("Some bigger item\nwith some\nmore lines")
});
},
);
});
});
},
)
}