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use crate::{Atom, FontSelection, Id, Ui};
use emath::Vec2;
/// A trait for conveniently building [`Atom`]s.
///
/// The functions are prefixed with `atom_` to avoid conflicts with e.g. [`crate::RichText::size`].
pub trait AtomExt<'a> {
/// Set the [`Id`] for custom rendering.
///
/// You can get the [`crate::Rect`] with the [`Id`] from [`crate::AtomLayoutResponse`] and use a
/// [`crate::Painter`] or [`Ui::place`] to add/draw some custom content.
fn atom_id(self, id: Id) -> Atom<'a>;
/// Set the atom to a fixed size.
///
/// If [`Atom::grow`] is `true`, this will be the minimum width.
/// If [`Atom::shrink`] is `true`, this will be the maximum width.
/// If both are true, the width will have no effect.
///
/// [`Self::atom_max_size`] will limit size.
///
/// See [`crate::AtomKind`] docs to see how the size affects the different types.
fn atom_size(self, size: Vec2) -> Atom<'a>;
/// Grow this atom to the available space.
///
/// This will affect the size of the [`Atom`] in the main direction. Since
/// [`crate::AtomLayout`] today only supports horizontal layout, it will affect the width.
///
/// You can also combine this with [`Self::atom_shrink`] to make it always take exactly the
/// remaining space.
fn atom_grow(self, grow: bool) -> Atom<'a>;
/// Shrink this atom if there isn't enough space.
///
/// This will affect the size of the [`Atom`] in the main direction. Since
/// [`crate::AtomLayout`] today only supports horizontal layout, it will affect the width.
///
/// NOTE: Only a single [`Atom`] may shrink for each widget.
///
/// If no atom was set to shrink and `wrap_mode != TextWrapMode::Extend`, the first
/// `AtomKind::Text` is set to shrink.
fn atom_shrink(self, shrink: bool) -> Atom<'a>;
/// Set the maximum size of this atom.
///
/// Will not affect the space taken by `grow` (All atoms marked as grow will always grow
/// equally to fill the available space).
fn atom_max_size(self, max_size: Vec2) -> Atom<'a>;
/// Set the maximum width of this atom.
///
/// Will not affect the space taken by `grow` (All atoms marked as grow will always grow
/// equally to fill the available space).
fn atom_max_width(self, max_width: f32) -> Atom<'a>;
/// Set the maximum height of this atom.
fn atom_max_height(self, max_height: f32) -> Atom<'a>;
/// Set the max height of this atom to match the font size.
///
/// This is useful for e.g. limiting the height of icons in buttons.
fn atom_max_height_font_size(self, ui: &Ui) -> Atom<'a>
where
Self: Sized,
{
let font_selection = FontSelection::default();
let font_id = font_selection.resolve(ui.style());
let height = ui.fonts_mut(|f| f.row_height(&font_id));
self.atom_max_height(height)
}
/// Sets the [`emath::Align2`] of a single atom within its available space.
///
/// Defaults to center-center.
fn atom_align(self, align: emath::Align2) -> Atom<'a>;
}
impl<'a, T> AtomExt<'a> for T
where
T: Into<Atom<'a>> + Sized,
{
fn atom_id(self, id: Id) -> Atom<'a> {
let mut atom = self.into();
atom.id = Some(id);
atom
}
fn atom_size(self, size: Vec2) -> Atom<'a> {
let mut atom = self.into();
atom.size = Some(size);
atom
}
fn atom_grow(self, grow: bool) -> Atom<'a> {
let mut atom = self.into();
atom.grow = grow;
atom
}
fn atom_shrink(self, shrink: bool) -> Atom<'a> {
let mut atom = self.into();
atom.shrink = shrink;
atom
}
fn atom_max_size(self, max_size: Vec2) -> Atom<'a> {
let mut atom = self.into();
atom.max_size = max_size;
atom
}
fn atom_max_width(self, max_width: f32) -> Atom<'a> {
let mut atom = self.into();
atom.max_size.x = max_width;
atom
}
fn atom_max_height(self, max_height: f32) -> Atom<'a> {
let mut atom = self.into();
atom.max_size.y = max_height;
atom
}
fn atom_align(self, align: emath::Align2) -> Atom<'a> {
let mut atom = self.into();
atom.align = align;
atom
}
}