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Improve Ui::add_sized (simplify and fix bugs)

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This commit is contained in:
Emil Ernerfeldt 2021-03-31 22:18:08 +02:00
parent 1090de67fd
commit b8a0f5be15
1 changed files with 18 additions and 5 deletions
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21
egui/src/ui.rs
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@ -696,13 +696,26 @@ impl Ui {
&mut self,
desired_size: Vec2,
add_contents: impl FnOnce(&mut Self) -> R,
) -> InnerResponse<R> {
self.allocate_ui_with_layout(desired_size, *self.layout(), add_contents)
}
/// Allocated the given space and then adds content to that space.
/// If the contents overflow, more space will be allocated.
/// When finished, the amount of space actually used (`min_rect`) will be allocated.
/// So you can request a lot of space and then use less.
pub fn allocate_ui_with_layout<R>(
&mut self,
desired_size: Vec2,
layout: Layout,
add_contents: impl FnOnce(&mut Self) -> R,
) -> InnerResponse<R> {
debug_assert!(desired_size.x >= 0.0 && desired_size.y >= 0.0);
let item_spacing = self.spacing().item_spacing;
let frame_rect = self.placer.next_space(desired_size, item_spacing);
let child_rect = self.placer.justify_and_align(frame_rect, desired_size);
let mut child_ui = self.child_ui(child_rect, *self.layout());
let mut child_ui = self.child_ui(child_rect, layout);
let ret = add_contents(&mut child_ui);
let final_child_rect = child_ui.min_rect();
@ -804,9 +817,9 @@ impl Ui {
/// ui.add_sized([40.0, 20.0], egui::DragValue::new(&mut my_value));
/// ```
pub fn add_sized(&mut self, max_size: impl Into<Vec2>, widget: impl Widget) -> Response {
self.allocate_ui(max_size.into(), |ui| {
ui.centered_and_justified(|ui| ui.add(widget)).inner
})
// Make sure we keep the same main direction since it changes e.g. how text is wrapped:
let layout = Layout::centered_and_justified(self.layout().main_dir());
self.allocate_ui_with_layout(max_size.into(), layout, |ui| ui.add(widget))
.inner
}