103 lines
3.3 KiB
Rust
103 lines
3.3 KiB
Rust
//! Display a dropdown list of selectable values.
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use crate::alignment;
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use crate::backend::{self, Backend};
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use crate::{Primitive, Renderer};
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use iced_native::{mouse, Font, Padding, Point, Rectangle};
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use iced_style::menu;
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pub use iced_native::pick_list::State;
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pub use iced_style::pick_list::{Style, StyleSheet};
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/// A widget allowing the selection of a single value from a list of options.
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pub type PickList<'a, T, Message, Backend> =
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iced_native::PickList<'a, T, Message, Renderer<Backend>>;
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impl<B> iced_native::pick_list::Renderer for Renderer<B>
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where
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B: Backend + backend::Text,
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{
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type Style = Box<dyn StyleSheet>;
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const DEFAULT_PADDING: Padding = Padding::new(5);
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fn menu_style(style: &Box<dyn StyleSheet>) -> menu::Style {
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style.menu()
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}
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fn draw(
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&mut self,
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bounds: Rectangle,
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cursor_position: Point,
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selected: Option<String>,
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placeholder: Option<&str>,
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padding: Padding,
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text_size: u16,
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font: Font,
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style: &Box<dyn StyleSheet>,
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) -> Self::Output {
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let is_mouse_over = bounds.contains(cursor_position);
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let is_selected = selected.is_some();
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let style = if is_mouse_over {
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style.hovered()
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} else {
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style.active()
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};
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let background = Primitive::Quad {
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bounds,
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background: style.background,
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border_color: style.border_color,
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border_width: style.border_width,
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border_radius: style.border_radius,
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};
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let arrow_down = Primitive::Text {
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content: B::ARROW_DOWN_ICON.to_string(),
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font: B::ICON_FONT,
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size: bounds.height * style.icon_size,
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bounds: Rectangle {
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x: bounds.x + bounds.width - f32::from(padding.horizontal()),
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y: bounds.center_y(),
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..bounds
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},
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color: style.text_color,
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horizontal_alignment: alignment::Horizontal::Right,
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vertical_alignment: alignment::Vertical::Center,
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};
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(
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Primitive::Group {
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primitives: if let Some(label) =
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selected.or_else(|| placeholder.map(str::to_string))
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{
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let label = Primitive::Text {
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content: label,
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size: f32::from(text_size),
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font,
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color: is_selected
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.then(|| style.text_color)
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.unwrap_or(style.placeholder_color),
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bounds: Rectangle {
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x: bounds.x + f32::from(padding.left),
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y: bounds.center_y(),
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..bounds
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},
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horizontal_alignment: alignment::Horizontal::Left,
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vertical_alignment: alignment::Vertical::Center,
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};
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vec![background, label, arrow_down]
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} else {
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vec![background, arrow_down]
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},
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},
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if is_mouse_over {
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mouse::Interaction::Pointer
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} else {
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mouse::Interaction::default()
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},
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)
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}
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}
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