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https://github.com/emilk/egui.git
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396 lines
12 KiB
Rust
396 lines
12 KiB
Rust
#![allow(clippy::new_without_default)]
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use crate::{
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layout::{Direction, GuiResponse},
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*,
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};
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mod slider;
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mod text_edit;
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pub use {slider::*, text_edit::*};
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// ----------------------------------------------------------------------------
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/// Anything implementing Widget can be added to a Region with Region::add
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pub trait Widget {
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fn ui(self, region: &mut Region) -> GuiResponse;
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}
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// ----------------------------------------------------------------------------
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pub struct Label {
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text: String,
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multiline: bool,
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text_style: TextStyle, // TODO: Option<TextStyle>, where None means "use the default for the region"
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text_color: Option<Color>,
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}
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impl Label {
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pub fn new(text: impl Into<String>) -> Self {
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Label {
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text: text.into(),
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multiline: true,
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text_style: TextStyle::Body,
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text_color: None,
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}
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}
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pub fn multiline(mut self, multiline: bool) -> Self {
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self.multiline = multiline;
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self
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}
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pub fn text_style(mut self, text_style: TextStyle) -> Self {
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self.text_style = text_style;
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self
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}
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pub fn text_color(mut self, text_color: Color) -> Self {
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self.text_color = Some(text_color);
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self
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}
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}
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/// Usage: label!("Foo: {}", bar)
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#[macro_export]
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macro_rules! label {
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($fmt:expr) => ($crate::widgets::Label::new($fmt));
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($fmt:expr, $($arg:tt)*) => ($crate::widgets::Label::new(format!($fmt, $($arg)*)));
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}
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impl Widget for Label {
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fn ui(self, region: &mut Region) -> GuiResponse {
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let font = ®ion.fonts()[self.text_style];
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let (text, text_size) = if self.multiline {
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font.layout_multiline(&self.text, region.available_width())
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} else {
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font.layout_single_line(&self.text)
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};
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let interact = region.reserve_space(text_size, None);
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region.add_text(interact.rect.min, self.text_style, text, self.text_color);
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region.response(interact)
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}
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}
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// ----------------------------------------------------------------------------
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pub struct Hyperlink {
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url: String,
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text: String,
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}
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impl Hyperlink {
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pub fn new(url: impl Into<String>) -> Self {
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let url = url.into();
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Self {
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text: url.clone(),
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url,
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}
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}
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}
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impl Widget for Hyperlink {
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fn ui(self, region: &mut Region) -> GuiResponse {
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let color = color::LIGHT_BLUE;
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let text_style = TextStyle::Body;
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let id = region.make_child_id(&self.url);
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let font = ®ion.fonts()[text_style];
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let line_spacing = font.line_spacing();
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// TODO: underline
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let (text, text_size) = font.layout_multiline(&self.text, region.available_width());
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let interact = region.reserve_space(text_size, Some(id));
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if interact.hovered {
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region.ctx().output().cursor_icon = CursorIcon::PointingHand;
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}
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if interact.clicked {
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region.ctx().output().open_url = Some(self.url);
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}
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if interact.hovered {
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// Underline:
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for fragment in &text {
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let pos = interact.rect.min;
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let y = pos.y + fragment.y_offset + line_spacing;
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let y = region.round_to_pixel(y);
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let min_x = pos.x + fragment.min_x();
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let max_x = pos.x + fragment.max_x();
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region.add_paint_cmd(PaintCmd::Line {
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points: vec![pos2(min_x, y), pos2(max_x, y)],
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color,
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width: region.style().line_width,
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});
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}
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}
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region.add_text(interact.rect.min, text_style, text, Some(color));
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region.response(interact)
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}
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}
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// ----------------------------------------------------------------------------
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pub struct Button {
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text: String,
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text_color: Option<Color>,
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}
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impl Button {
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pub fn new(text: impl Into<String>) -> Self {
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Button {
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text: text.into(),
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text_color: None,
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}
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}
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pub fn text_color(mut self, text_color: Color) -> Self {
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self.text_color = Some(text_color);
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self
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}
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}
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impl Widget for Button {
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fn ui(self, region: &mut Region) -> GuiResponse {
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let id = region.make_position_id();
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let text_style = TextStyle::Button;
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let font = ®ion.fonts()[text_style];
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let (text, text_size) = font.layout_multiline(&self.text, region.available_width());
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let padding = region.style().button_padding;
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let mut size = text_size + 2.0 * padding;
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size.y = size.y.max(region.style().clickable_diameter);
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let interact = region.reserve_space(size, Some(id));
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let mut text_cursor = interact.rect.left_center() + vec2(padding.x, -0.5 * text_size.y);
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text_cursor.y += 2.0; // TODO: why is this needed?
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region.add_paint_cmd(PaintCmd::Rect {
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corner_radius: region.style().interact_corner_radius(&interact),
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fill_color: region.style().interact_fill_color(&interact),
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outline: region.style().interact_outline(&interact),
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rect: interact.rect,
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});
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let stroke_color = region.style().interact_stroke_color(&interact);
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let text_color = self.text_color.unwrap_or(stroke_color);
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region.add_text(text_cursor, text_style, text, Some(text_color));
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region.response(interact)
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}
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}
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// ----------------------------------------------------------------------------
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#[derive(Debug)]
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pub struct Checkbox<'a> {
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checked: &'a mut bool,
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text: String,
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text_color: Option<Color>,
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}
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impl<'a> Checkbox<'a> {
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pub fn new(checked: &'a mut bool, text: impl Into<String>) -> Self {
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Checkbox {
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checked,
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text: text.into(),
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text_color: None,
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}
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}
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pub fn text_color(mut self, text_color: Color) -> Self {
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self.text_color = Some(text_color);
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self
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}
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}
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impl<'a> Widget for Checkbox<'a> {
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fn ui(self, region: &mut Region) -> GuiResponse {
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let id = region.make_position_id();
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let text_style = TextStyle::Button;
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let font = ®ion.fonts()[text_style];
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let (text, text_size) = font.layout_multiline(&self.text, region.available_width());
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let interact = region.reserve_space(
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region.style().button_padding
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+ vec2(region.style().start_icon_width, 0.0)
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+ text_size
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+ region.style().button_padding,
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Some(id),
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);
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let text_cursor = interact.rect.min
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+ region.style().button_padding
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+ vec2(region.style().start_icon_width, 0.0);
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if interact.clicked {
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*self.checked = !*self.checked;
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}
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let (small_icon_rect, big_icon_rect) = region.style().icon_rectangles(interact.rect);
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region.add_paint_cmd(PaintCmd::Rect {
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corner_radius: 3.0,
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fill_color: region.style().interact_fill_color(&interact),
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outline: None,
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rect: big_icon_rect,
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});
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let stroke_color = region.style().interact_stroke_color(&interact);
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if *self.checked {
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region.add_paint_cmd(PaintCmd::Line {
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points: vec![
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pos2(small_icon_rect.left(), small_icon_rect.center().y),
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pos2(small_icon_rect.center().x, small_icon_rect.bottom()),
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pos2(small_icon_rect.right(), small_icon_rect.top()),
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],
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color: stroke_color,
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width: region.style().line_width,
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});
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}
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let text_color = self.text_color.unwrap_or(stroke_color);
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region.add_text(text_cursor, text_style, text, Some(text_color));
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region.response(interact)
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}
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}
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// ----------------------------------------------------------------------------
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#[derive(Debug)]
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pub struct RadioButton {
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checked: bool,
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text: String,
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text_color: Option<Color>,
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}
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impl RadioButton {
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pub fn new(checked: bool, text: impl Into<String>) -> Self {
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RadioButton {
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checked,
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text: text.into(),
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text_color: None,
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}
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}
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pub fn text_color(mut self, text_color: Color) -> Self {
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self.text_color = Some(text_color);
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self
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}
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}
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pub fn radio(checked: bool, text: impl Into<String>) -> RadioButton {
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RadioButton::new(checked, text)
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}
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impl Widget for RadioButton {
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fn ui(self, region: &mut Region) -> GuiResponse {
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let id = region.make_position_id();
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let text_style = TextStyle::Button;
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let font = ®ion.fonts()[text_style];
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let (text, text_size) = font.layout_multiline(&self.text, region.available_width());
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let interact = region.reserve_space(
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region.style().button_padding
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+ vec2(region.style().start_icon_width, 0.0)
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+ text_size
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+ region.style().button_padding,
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Some(id),
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);
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let text_cursor = interact.rect.min
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+ region.style().button_padding
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+ vec2(region.style().start_icon_width, 0.0);
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let fill_color = region.style().interact_fill_color(&interact);
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let stroke_color = region.style().interact_stroke_color(&interact);
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let (small_icon_rect, big_icon_rect) = region.style().icon_rectangles(interact.rect);
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region.add_paint_cmd(PaintCmd::Circle {
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center: big_icon_rect.center(),
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fill_color,
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outline: None,
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radius: big_icon_rect.width() / 2.0,
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});
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if self.checked {
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region.add_paint_cmd(PaintCmd::Circle {
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center: small_icon_rect.center(),
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fill_color: Some(stroke_color),
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outline: None,
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radius: small_icon_rect.width() / 2.0,
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});
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}
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let text_color = self.text_color.unwrap_or(stroke_color);
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region.add_text(text_cursor, text_style, text, Some(text_color));
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region.response(interact)
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}
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}
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// ----------------------------------------------------------------------------
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pub struct Separator {
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line_width: f32,
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min_length: f32,
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extra: f32,
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color: Color,
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}
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impl Separator {
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pub fn new() -> Separator {
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Separator {
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line_width: 2.0,
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min_length: 6.0,
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extra: 0.0,
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color: color::WHITE,
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}
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}
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pub fn line_width(mut self, line_width: f32) -> Self {
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self.line_width = line_width;
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self
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}
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pub fn min_length(mut self, min_length: f32) -> Self {
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self.min_length = min_length;
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self
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}
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/// Draw this much longer on each side
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pub fn extra(mut self, extra: f32) -> Self {
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self.extra = extra;
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self
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}
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pub fn color(mut self, color: Color) -> Self {
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self.color = color;
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self
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}
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}
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impl Widget for Separator {
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fn ui(self, region: &mut Region) -> GuiResponse {
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let available_space = region.available_space();
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let extra = self.extra;
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let (points, interact) = match region.direction() {
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Direction::Horizontal => {
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let interact = region.reserve_space(vec2(self.min_length, available_space.y), None);
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(
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vec![
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pos2(interact.rect.center().x, interact.rect.top() - extra),
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pos2(interact.rect.center().x, interact.rect.bottom() + extra),
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],
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interact,
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)
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}
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Direction::Vertical => {
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let interact = region.reserve_space(vec2(available_space.x, self.min_length), None);
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(
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vec![
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pos2(interact.rect.left() - extra, interact.rect.center().y),
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pos2(interact.rect.right() + extra, interact.rect.center().y),
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],
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interact,
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)
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}
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};
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region.add_paint_cmd(PaintCmd::Line {
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points,
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color: self.color,
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width: self.line_width,
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});
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region.response(interact)
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}
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}
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