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use crate::{paint::Galley, *};
#[must_use = "You should put this widget in an ui with `ui.add(widget);`"]
pub struct Label {
pub(crate) text: String,
pub(crate) multiline: Option<bool>,
pub(crate) text_style: Option<TextStyle>,
pub(crate) text_color: Option<Color32>,
}
impl Label {
pub fn new(text: impl Into<String>) -> Self {
Self {
text: text.into(),
multiline: None,
text_style: None,
text_color: None,
}
}
pub fn text(&self) -> &str {
&self.text
}
pub fn multiline(mut self, multiline: bool) -> Self {
self.multiline = Some(multiline);
self
}
pub fn text_style(mut self, text_style: TextStyle) -> Self {
self.text_style = Some(text_style);
self
}
pub fn heading(self) -> Self {
self.text_style(TextStyle::Heading)
}
pub fn monospace(self) -> Self {
self.text_style(TextStyle::Monospace)
}
pub fn small(self) -> Self {
self.text_style(TextStyle::Small)
}
pub fn text_color(mut self, text_color: impl Into<Color32>) -> Self {
self.text_color = Some(text_color.into());
self
}
pub fn layout(&self, ui: &Ui) -> Galley {
let max_width = ui.available_width();
self.layout_width(ui, max_width)
}
pub fn layout_width(&self, ui: &Ui, max_width: f32) -> Galley {
let text_style = self.text_style_or_default(ui.style());
let font = &ui.fonts()[text_style];
if self.is_multiline(ui) {
font.layout_multiline(self.text.clone(), max_width)
} else {
font.layout_single_line(self.text.clone())
}
}
pub fn font_height(&self, fonts: &paint::Fonts, style: &Style) -> f32 {
let text_style = self.text_style_or_default(style);
fonts[text_style].row_height()
}
pub fn paint_galley(&self, ui: &mut Ui, pos: Pos2, galley: Galley) {
let text_style = self.text_style_or_default(ui.style());
let text_color = self
.text_color
.unwrap_or_else(|| ui.style().visuals.text_color());
ui.painter().galley(pos, galley, text_style, text_color);
}
pub fn text_style_or_default(&self, style: &Style) -> TextStyle {
self.text_style.unwrap_or(style.body_text_style)
}
fn is_multiline(&self, ui: &Ui) -> bool {
self.multiline.unwrap_or_else(|| {
let layout = ui.layout();
layout.is_vertical()
|| layout.is_horizontal() && layout.main_wrap()
|| self.text.contains('\n')
})
}
}
impl Widget for Label {
fn ui(self, ui: &mut Ui) -> Response {
if self.is_multiline(ui)
&& ui.layout().main_dir() == Direction::LeftToRight
&& ui.layout().main_wrap()
{
let max_width = ui.available_width();
let first_row_indentation = max_width - ui.available_size_before_wrap().x;
let text_style = self.text_style_or_default(ui.style());
let font = &ui.fonts()[text_style];
let mut galley = font.layout_multiline_with_indentation_and_max_width(
self.text.clone(),
first_row_indentation,
max_width,
);
let pos = pos2(ui.min_rect().left(), ui.cursor().y);
assert!(!galley.rows.is_empty(), "Galleys are never empty");
let rect = galley.rows[0].rect().translate(vec2(pos.x, pos.y));
let id = ui.advance_cursor_after_rect(rect);
let mut total_response = ui.interact(rect, id, Sense::hover());
let mut y_translation = 0.0;
if let Some(row) = galley.rows.get(1) {
if pos.y + row.y_min < ui.min_rect().bottom() {
y_translation = ui.min_rect().bottom() - row.y_min - pos.y;
}
}
for row in galley.rows.iter_mut().skip(1) {
row.y_min += y_translation;
row.y_max += y_translation;
let rect = row.rect().translate(vec2(pos.x, pos.y));
ui.advance_cursor_after_rect(rect);
total_response |= ui.interact(rect, id, Sense::hover());
}
self.paint_galley(ui, pos, galley);
total_response
} else {
let galley = self.layout(ui);
let response = ui.allocate_response(galley.size, Sense::click());
let rect = ui
.layout()
.align_size_within_rect(galley.size, response.rect);
self.paint_galley(ui, rect.min, galley);
response
}
}
}
impl Into<Label> for &str {
fn into(self) -> Label {
Label::new(self)
}
}
impl Into<Label> for &String {
fn into(self) -> Label {
Label::new(self)
}
}
impl Into<Label> for String {
fn into(self) -> Label {
Label::new(self)
}
}