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use crate::{
layout, Color, Element, Hasher, HorizontalAlignment, Layout, Length, Point,
Rectangle, Size, VerticalAlignment, Widget,
};
use std::hash::Hash;
#[derive(Debug)]
pub struct Text<Renderer: self::Renderer> {
content: String,
size: Option<u16>,
color: Option<Color>,
font: Renderer::Font,
width: Length,
height: Length,
horizontal_alignment: HorizontalAlignment,
vertical_alignment: VerticalAlignment,
}
impl<Renderer: self::Renderer> Text<Renderer> {
pub fn new<T: Into<String>>(label: T) -> Self {
Text {
content: label.into(),
size: None,
color: None,
font: Default::default(),
width: Length::Shrink,
height: Length::Shrink,
horizontal_alignment: HorizontalAlignment::Left,
vertical_alignment: VerticalAlignment::Top,
}
}
pub fn size(mut self, size: u16) -> Self {
self.size = Some(size);
self
}
pub fn color<C: Into<Color>>(mut self, color: C) -> Self {
self.color = Some(color.into());
self
}
pub fn font(mut self, font: impl Into<Renderer::Font>) -> Self {
self.font = font.into();
self
}
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
pub fn height(mut self, height: Length) -> Self {
self.height = height;
self
}
pub fn horizontal_alignment(
mut self,
alignment: HorizontalAlignment,
) -> Self {
self.horizontal_alignment = alignment;
self
}
pub fn vertical_alignment(mut self, alignment: VerticalAlignment) -> Self {
self.vertical_alignment = alignment;
self
}
}
impl<Message, Renderer> Widget<Message, Renderer> for Text<Renderer>
where
Renderer: self::Renderer,
{
fn width(&self) -> Length {
self.width
}
fn height(&self) -> Length {
self.height
}
fn layout(
&self,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let limits = limits.width(self.width).height(self.height);
let size = self.size.unwrap_or(renderer.default_size());
let bounds = limits.max();
let (width, height) =
renderer.measure(&self.content, size, self.font, bounds);
let size = limits.resolve(Size::new(width, height));
layout::Node::new(size)
}
fn draw(
&self,
renderer: &mut Renderer,
defaults: &Renderer::Defaults,
layout: Layout<'_>,
_cursor_position: Point,
) -> Renderer::Output {
renderer.draw(
defaults,
layout.bounds(),
&self.content,
self.size.unwrap_or(renderer.default_size()),
self.font,
self.color,
self.horizontal_alignment,
self.vertical_alignment,
)
}
fn hash_layout(&self, state: &mut Hasher) {
struct Marker;
std::any::TypeId::of::<Marker>().hash(state);
self.content.hash(state);
self.size.hash(state);
self.width.hash(state);
self.height.hash(state);
}
}
pub trait Renderer: crate::Renderer {
type Font: Default + Copy;
fn default_size(&self) -> u16;
fn measure(
&self,
content: &str,
size: u16,
font: Self::Font,
bounds: Size,
) -> (f32, f32);
fn draw(
&mut self,
defaults: &Self::Defaults,
bounds: Rectangle,
content: &str,
size: u16,
font: Self::Font,
color: Option<Color>,
horizontal_alignment: HorizontalAlignment,
vertical_alignment: VerticalAlignment,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Text<Renderer>>
for Element<'a, Message, Renderer>
where
Renderer: self::Renderer + 'a,
{
fn from(text: Text<Renderer>) -> Element<'a, Message, Renderer> {
Element::new(text)
}
}
impl<Renderer: self::Renderer> Clone for Text<Renderer> {
fn clone(&self) -> Self {
Self {
content: self.content.clone(),
size: self.size,
color: self.color,
font: self.font,
width: self.width,
height: self.height,
horizontal_alignment: self.horizontal_alignment,
vertical_alignment: self.vertical_alignment,
}
}
}