753 lines
21 KiB
Rust
753 lines
21 KiB
Rust
//! Display a dropdown list of selectable values.
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use crate::container;
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use crate::core::alignment;
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use crate::core::event::{self, Event};
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use crate::core::keyboard;
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use crate::core::layout;
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use crate::core::mouse;
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use crate::core::overlay;
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use crate::core::renderer;
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use crate::core::text::{self, Paragraph as _, Text};
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use crate::core::touch;
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use crate::core::widget::tree::{self, Tree};
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use crate::core::{
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Clipboard, Element, Layout, Length, Padding, Pixels, Point, Rectangle,
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Shell, Size, Widget,
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};
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use crate::overlay::menu::{self, Menu};
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use crate::scrollable;
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use std::borrow::Cow;
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pub use crate::style::pick_list::{Appearance, StyleSheet};
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/// A widget for selecting a single value from a list of options.
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#[allow(missing_debug_implementations)]
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pub struct PickList<'a, T, Message, Renderer = crate::Renderer>
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where
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[T]: ToOwned<Owned = Vec<T>>,
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Renderer: text::Renderer,
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Renderer::Theme: StyleSheet,
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{
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on_selected: Box<dyn Fn(T) -> Message + 'a>,
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options: Cow<'a, [T]>,
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placeholder: Option<String>,
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selected: Option<T>,
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width: Length,
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padding: Padding,
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text_size: Option<Pixels>,
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text_line_height: text::LineHeight,
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text_shaping: text::Shaping,
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font: Option<Renderer::Font>,
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handle: Handle<Renderer::Font>,
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style: <Renderer::Theme as StyleSheet>::Style,
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}
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impl<'a, T: 'a, Message, Renderer> PickList<'a, T, Message, Renderer>
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where
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T: ToString + PartialEq,
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[T]: ToOwned<Owned = Vec<T>>,
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Renderer: text::Renderer,
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Renderer::Theme: StyleSheet
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+ scrollable::StyleSheet
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+ menu::StyleSheet
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+ container::StyleSheet,
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<Renderer::Theme as menu::StyleSheet>::Style:
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From<<Renderer::Theme as StyleSheet>::Style>,
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{
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/// The default padding of a [`PickList`].
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pub const DEFAULT_PADDING: Padding = Padding::new(5.0);
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/// Creates a new [`PickList`] with the given list of options, the current
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/// selected value, and the message to produce when an option is selected.
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pub fn new(
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options: impl Into<Cow<'a, [T]>>,
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selected: Option<T>,
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on_selected: impl Fn(T) -> Message + 'a,
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) -> Self {
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Self {
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on_selected: Box::new(on_selected),
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options: options.into(),
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placeholder: None,
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selected,
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width: Length::Shrink,
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padding: Self::DEFAULT_PADDING,
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text_size: None,
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text_line_height: text::LineHeight::default(),
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text_shaping: text::Shaping::Basic,
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font: None,
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handle: Handle::default(),
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style: Default::default(),
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}
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}
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/// Sets the placeholder of the [`PickList`].
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pub fn placeholder(mut self, placeholder: impl Into<String>) -> Self {
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self.placeholder = Some(placeholder.into());
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self
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}
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/// Sets the width of the [`PickList`].
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pub fn width(mut self, width: impl Into<Length>) -> Self {
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self.width = width.into();
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self
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}
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/// Sets the [`Padding`] of the [`PickList`].
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pub fn padding<P: Into<Padding>>(mut self, padding: P) -> Self {
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self.padding = padding.into();
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self
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}
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/// Sets the text size of the [`PickList`].
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pub fn text_size(mut self, size: impl Into<Pixels>) -> Self {
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self.text_size = Some(size.into());
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self
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}
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/// Sets the text [`text::LineHeight`] of the [`PickList`].
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pub fn text_line_height(
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mut self,
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line_height: impl Into<text::LineHeight>,
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) -> Self {
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self.text_line_height = line_height.into();
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self
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}
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/// Sets the [`text::Shaping`] strategy of the [`PickList`].
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pub fn text_shaping(mut self, shaping: text::Shaping) -> Self {
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self.text_shaping = shaping;
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self
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}
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/// Sets the font of the [`PickList`].
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pub fn font(mut self, font: impl Into<Renderer::Font>) -> Self {
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self.font = Some(font.into());
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self
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}
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/// Sets the [`Handle`] of the [`PickList`].
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pub fn handle(mut self, handle: Handle<Renderer::Font>) -> Self {
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self.handle = handle;
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self
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}
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/// Sets the style of the [`PickList`].
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pub fn style(
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mut self,
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style: impl Into<<Renderer::Theme as StyleSheet>::Style>,
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) -> Self {
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self.style = style.into();
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self
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}
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}
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impl<'a, T: 'a, Message, Renderer> Widget<Message, Renderer>
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for PickList<'a, T, Message, Renderer>
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where
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T: Clone + ToString + PartialEq + 'static,
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[T]: ToOwned<Owned = Vec<T>>,
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Message: 'a,
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Renderer: text::Renderer + 'a,
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Renderer::Theme: StyleSheet
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+ scrollable::StyleSheet
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+ menu::StyleSheet
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+ container::StyleSheet,
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<Renderer::Theme as menu::StyleSheet>::Style:
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From<<Renderer::Theme as StyleSheet>::Style>,
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{
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fn tag(&self) -> tree::Tag {
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tree::Tag::of::<State<Renderer::Paragraph>>()
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}
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fn state(&self) -> tree::State {
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tree::State::new(State::<Renderer::Paragraph>::new())
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}
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fn size(&self) -> Size<Length> {
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Size {
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width: self.width,
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height: Length::Shrink,
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}
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}
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fn layout(
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&self,
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tree: &mut Tree,
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renderer: &Renderer,
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limits: &layout::Limits,
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) -> layout::Node {
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layout(
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tree.state.downcast_mut::<State<Renderer::Paragraph>>(),
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renderer,
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limits,
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self.width,
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self.padding,
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self.text_size,
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self.text_line_height,
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self.text_shaping,
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self.font,
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self.placeholder.as_deref(),
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&self.options,
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)
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}
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fn on_event(
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&mut self,
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tree: &mut Tree,
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event: Event,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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_renderer: &Renderer,
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_clipboard: &mut dyn Clipboard,
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shell: &mut Shell<'_, Message>,
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_viewport: &Rectangle,
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) -> event::Status {
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update(
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event,
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layout,
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cursor,
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shell,
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self.on_selected.as_ref(),
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self.selected.as_ref(),
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&self.options,
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|| tree.state.downcast_mut::<State<Renderer::Paragraph>>(),
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)
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}
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fn mouse_interaction(
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&self,
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_tree: &Tree,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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_viewport: &Rectangle,
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_renderer: &Renderer,
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) -> mouse::Interaction {
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mouse_interaction(layout, cursor)
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}
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fn draw(
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&self,
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tree: &Tree,
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renderer: &mut Renderer,
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theme: &Renderer::Theme,
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_style: &renderer::Style,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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viewport: &Rectangle,
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) {
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let font = self.font.unwrap_or_else(|| renderer.default_font());
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draw(
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renderer,
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theme,
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layout,
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cursor,
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self.padding,
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self.text_size,
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self.text_line_height,
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self.text_shaping,
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font,
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self.placeholder.as_deref(),
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self.selected.as_ref(),
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&self.handle,
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&self.style,
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|| tree.state.downcast_ref::<State<Renderer::Paragraph>>(),
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viewport,
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);
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}
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fn overlay<'b>(
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&'b mut self,
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tree: &'b mut Tree,
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layout: Layout<'_>,
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renderer: &Renderer,
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) -> Option<overlay::Element<'b, Message, Renderer>> {
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let state = tree.state.downcast_mut::<State<Renderer::Paragraph>>();
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overlay(
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layout,
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state,
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self.padding,
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self.text_size,
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self.text_shaping,
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self.font.unwrap_or_else(|| renderer.default_font()),
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&self.options,
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&self.on_selected,
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self.style.clone(),
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)
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}
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}
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impl<'a, T: 'a, Message, Renderer> From<PickList<'a, T, Message, Renderer>>
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for Element<'a, Message, Renderer>
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where
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T: Clone + ToString + PartialEq + 'static,
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[T]: ToOwned<Owned = Vec<T>>,
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Message: 'a,
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Renderer: text::Renderer + 'a,
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Renderer::Theme: StyleSheet
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+ scrollable::StyleSheet
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+ menu::StyleSheet
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+ container::StyleSheet,
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<Renderer::Theme as menu::StyleSheet>::Style:
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From<<Renderer::Theme as StyleSheet>::Style>,
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{
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fn from(pick_list: PickList<'a, T, Message, Renderer>) -> Self {
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Self::new(pick_list)
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}
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}
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/// The state of a [`PickList`].
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#[derive(Debug)]
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pub struct State<P: text::Paragraph> {
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menu: menu::State,
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keyboard_modifiers: keyboard::Modifiers,
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is_open: bool,
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hovered_option: Option<usize>,
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options: Vec<P>,
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placeholder: P,
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}
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impl<P: text::Paragraph> State<P> {
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/// Creates a new [`State`] for a [`PickList`].
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fn new() -> Self {
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Self {
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menu: menu::State::default(),
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keyboard_modifiers: keyboard::Modifiers::default(),
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is_open: bool::default(),
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hovered_option: Option::default(),
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options: Vec::new(),
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placeholder: P::default(),
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}
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}
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}
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impl<P: text::Paragraph> Default for State<P> {
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fn default() -> Self {
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Self::new()
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}
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}
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/// The handle to the right side of the [`PickList`].
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#[derive(Debug, Clone, PartialEq)]
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pub enum Handle<Font> {
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/// Displays an arrow icon (▼).
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///
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/// This is the default.
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Arrow {
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/// Font size of the content.
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size: Option<Pixels>,
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},
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/// A custom static handle.
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Static(Icon<Font>),
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/// A custom dynamic handle.
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Dynamic {
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/// The [`Icon`] used when [`PickList`] is closed.
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closed: Icon<Font>,
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/// The [`Icon`] used when [`PickList`] is open.
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open: Icon<Font>,
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},
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/// No handle will be shown.
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None,
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}
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impl<Font> Default for Handle<Font> {
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fn default() -> Self {
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Self::Arrow { size: None }
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}
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}
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/// The icon of a [`Handle`].
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#[derive(Debug, Clone, PartialEq)]
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pub struct Icon<Font> {
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/// Font that will be used to display the `code_point`,
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pub font: Font,
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/// The unicode code point that will be used as the icon.
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pub code_point: char,
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/// Font size of the content.
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pub size: Option<Pixels>,
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/// Line height of the content.
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pub line_height: text::LineHeight,
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/// The shaping strategy of the icon.
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pub shaping: text::Shaping,
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}
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/// Computes the layout of a [`PickList`].
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pub fn layout<Renderer, T>(
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state: &mut State<Renderer::Paragraph>,
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renderer: &Renderer,
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limits: &layout::Limits,
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width: Length,
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padding: Padding,
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text_size: Option<Pixels>,
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text_line_height: text::LineHeight,
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text_shaping: text::Shaping,
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font: Option<Renderer::Font>,
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placeholder: Option<&str>,
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options: &[T],
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) -> layout::Node
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where
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Renderer: text::Renderer,
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T: ToString,
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{
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use std::f32;
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let font = font.unwrap_or_else(|| renderer.default_font());
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let text_size = text_size.unwrap_or_else(|| renderer.default_size());
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state.options.resize_with(options.len(), Default::default);
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let option_text = Text {
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content: "",
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bounds: Size::new(
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f32::INFINITY,
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text_line_height.to_absolute(text_size).into(),
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),
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size: text_size,
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line_height: text_line_height,
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font,
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horizontal_alignment: alignment::Horizontal::Left,
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vertical_alignment: alignment::Vertical::Center,
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shaping: text_shaping,
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};
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for (option, paragraph) in options.iter().zip(state.options.iter_mut()) {
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let label = option.to_string();
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paragraph.update(Text {
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content: &label,
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..option_text
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});
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}
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if let Some(placeholder) = placeholder {
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state.placeholder.update(Text {
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content: placeholder,
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..option_text
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});
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}
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let max_width = match width {
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Length::Shrink => {
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let labels_width =
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state.options.iter().fold(0.0, |width, paragraph| {
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f32::max(width, paragraph.min_width())
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});
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labels_width.max(
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placeholder
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.map(|_| state.placeholder.min_width())
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.unwrap_or(0.0),
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)
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}
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_ => 0.0,
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};
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let size = {
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let intrinsic = Size::new(
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max_width + text_size.0 + padding.left,
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f32::from(text_line_height.to_absolute(text_size)),
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);
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limits
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.width(width)
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.shrink(padding)
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.resolve(width, Length::Shrink, intrinsic)
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.expand(padding)
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};
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layout::Node::new(size)
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}
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/// Processes an [`Event`] and updates the [`State`] of a [`PickList`]
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/// accordingly.
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pub fn update<'a, T, P, Message>(
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event: Event,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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shell: &mut Shell<'_, Message>,
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on_selected: &dyn Fn(T) -> Message,
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selected: Option<&T>,
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options: &[T],
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state: impl FnOnce() -> &'a mut State<P>,
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) -> event::Status
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where
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T: PartialEq + Clone + 'a,
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P: text::Paragraph + 'a,
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{
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match event {
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Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
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| Event::Touch(touch::Event::FingerPressed { .. }) => {
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let state = state();
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if state.is_open {
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// Event wasn't processed by overlay, so cursor was clicked either outside it's
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// bounds or on the drop-down, either way we close the overlay.
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state.is_open = false;
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event::Status::Captured
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} else if cursor.is_over(layout.bounds()) {
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state.is_open = true;
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state.hovered_option =
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options.iter().position(|option| Some(option) == selected);
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event::Status::Captured
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} else {
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event::Status::Ignored
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}
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}
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Event::Mouse(mouse::Event::WheelScrolled {
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delta: mouse::ScrollDelta::Lines { y, .. },
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}) => {
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let state = state();
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if state.keyboard_modifiers.command()
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&& cursor.is_over(layout.bounds())
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&& !state.is_open
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{
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fn find_next<'a, T: PartialEq>(
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selected: &'a T,
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mut options: impl Iterator<Item = &'a T>,
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) -> Option<&'a T> {
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let _ = options.find(|&option| option == selected);
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options.next()
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}
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let next_option = if y < 0.0 {
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if let Some(selected) = selected {
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find_next(selected, options.iter())
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} else {
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options.first()
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}
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} else if y > 0.0 {
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if let Some(selected) = selected {
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find_next(selected, options.iter().rev())
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} else {
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options.last()
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}
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} else {
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None
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};
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if let Some(next_option) = next_option {
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shell.publish((on_selected)(next_option.clone()));
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}
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event::Status::Captured
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} else {
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event::Status::Ignored
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}
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}
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Event::Keyboard(keyboard::Event::ModifiersChanged(modifiers)) => {
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let state = state();
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state.keyboard_modifiers = modifiers;
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event::Status::Ignored
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}
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_ => event::Status::Ignored,
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}
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}
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/// Returns the current [`mouse::Interaction`] of a [`PickList`].
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pub fn mouse_interaction(
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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) -> mouse::Interaction {
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let bounds = layout.bounds();
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let is_mouse_over = cursor.is_over(bounds);
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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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|
}
|
|
|
|
/// Returns the current overlay of a [`PickList`].
|
|
pub fn overlay<'a, T, Message, Renderer>(
|
|
layout: Layout<'_>,
|
|
state: &'a mut State<Renderer::Paragraph>,
|
|
padding: Padding,
|
|
text_size: Option<Pixels>,
|
|
text_shaping: text::Shaping,
|
|
font: Renderer::Font,
|
|
options: &'a [T],
|
|
on_selected: &'a dyn Fn(T) -> Message,
|
|
style: <Renderer::Theme as StyleSheet>::Style,
|
|
) -> Option<overlay::Element<'a, Message, Renderer>>
|
|
where
|
|
T: Clone + ToString,
|
|
Message: 'a,
|
|
Renderer: text::Renderer + 'a,
|
|
Renderer::Theme: StyleSheet
|
|
+ scrollable::StyleSheet
|
|
+ menu::StyleSheet
|
|
+ container::StyleSheet,
|
|
<Renderer::Theme as menu::StyleSheet>::Style:
|
|
From<<Renderer::Theme as StyleSheet>::Style>,
|
|
{
|
|
if state.is_open {
|
|
let bounds = layout.bounds();
|
|
|
|
let mut menu = Menu::new(
|
|
&mut state.menu,
|
|
options,
|
|
&mut state.hovered_option,
|
|
|option| {
|
|
state.is_open = false;
|
|
|
|
(on_selected)(option)
|
|
},
|
|
None,
|
|
)
|
|
.width(bounds.width)
|
|
.padding(padding)
|
|
.font(font)
|
|
.text_shaping(text_shaping)
|
|
.style(style);
|
|
|
|
if let Some(text_size) = text_size {
|
|
menu = menu.text_size(text_size);
|
|
}
|
|
|
|
Some(menu.overlay(layout.position(), bounds.height))
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
/// Draws a [`PickList`].
|
|
pub fn draw<'a, T, Renderer>(
|
|
renderer: &mut Renderer,
|
|
theme: &Renderer::Theme,
|
|
layout: Layout<'_>,
|
|
cursor: mouse::Cursor,
|
|
padding: Padding,
|
|
text_size: Option<Pixels>,
|
|
text_line_height: text::LineHeight,
|
|
text_shaping: text::Shaping,
|
|
font: Renderer::Font,
|
|
placeholder: Option<&str>,
|
|
selected: Option<&T>,
|
|
handle: &Handle<Renderer::Font>,
|
|
style: &<Renderer::Theme as StyleSheet>::Style,
|
|
state: impl FnOnce() -> &'a State<Renderer::Paragraph>,
|
|
viewport: &Rectangle,
|
|
) where
|
|
Renderer: text::Renderer,
|
|
Renderer::Theme: StyleSheet,
|
|
T: ToString + 'a,
|
|
{
|
|
let bounds = layout.bounds();
|
|
let is_mouse_over = cursor.is_over(bounds);
|
|
let is_selected = selected.is_some();
|
|
|
|
let style = if is_mouse_over {
|
|
theme.hovered(style)
|
|
} else {
|
|
theme.active(style)
|
|
};
|
|
|
|
renderer.fill_quad(
|
|
renderer::Quad {
|
|
bounds,
|
|
border: style.border,
|
|
..renderer::Quad::default()
|
|
},
|
|
style.background,
|
|
);
|
|
|
|
let handle = match handle {
|
|
Handle::Arrow { size } => Some((
|
|
Renderer::ICON_FONT,
|
|
Renderer::ARROW_DOWN_ICON,
|
|
*size,
|
|
text::LineHeight::default(),
|
|
text::Shaping::Basic,
|
|
)),
|
|
Handle::Static(Icon {
|
|
font,
|
|
code_point,
|
|
size,
|
|
line_height,
|
|
shaping,
|
|
}) => Some((*font, *code_point, *size, *line_height, *shaping)),
|
|
Handle::Dynamic { open, closed } => {
|
|
if state().is_open {
|
|
Some((
|
|
open.font,
|
|
open.code_point,
|
|
open.size,
|
|
open.line_height,
|
|
open.shaping,
|
|
))
|
|
} else {
|
|
Some((
|
|
closed.font,
|
|
closed.code_point,
|
|
closed.size,
|
|
closed.line_height,
|
|
closed.shaping,
|
|
))
|
|
}
|
|
}
|
|
Handle::None => None,
|
|
};
|
|
|
|
if let Some((font, code_point, size, line_height, shaping)) = handle {
|
|
let size = size.unwrap_or_else(|| renderer.default_size());
|
|
|
|
renderer.fill_text(
|
|
Text {
|
|
content: &code_point.to_string(),
|
|
size,
|
|
line_height,
|
|
font,
|
|
bounds: Size::new(
|
|
bounds.width,
|
|
f32::from(line_height.to_absolute(size)),
|
|
),
|
|
horizontal_alignment: alignment::Horizontal::Right,
|
|
vertical_alignment: alignment::Vertical::Center,
|
|
shaping,
|
|
},
|
|
Point::new(
|
|
bounds.x + bounds.width - padding.horizontal(),
|
|
bounds.center_y(),
|
|
),
|
|
style.handle_color,
|
|
*viewport,
|
|
);
|
|
}
|
|
|
|
let label = selected.map(ToString::to_string);
|
|
|
|
if let Some(label) = label.as_deref().or(placeholder) {
|
|
let text_size = text_size.unwrap_or_else(|| renderer.default_size());
|
|
|
|
renderer.fill_text(
|
|
Text {
|
|
content: label,
|
|
size: text_size,
|
|
line_height: text_line_height,
|
|
font,
|
|
bounds: Size::new(
|
|
bounds.width - padding.horizontal(),
|
|
f32::from(text_line_height.to_absolute(text_size)),
|
|
),
|
|
horizontal_alignment: alignment::Horizontal::Left,
|
|
vertical_alignment: alignment::Vertical::Center,
|
|
shaping: text_shaping,
|
|
},
|
|
Point::new(bounds.x + padding.left, bounds.center_y()),
|
|
if is_selected {
|
|
style.text_color
|
|
} else {
|
|
style.placeholder_color
|
|
},
|
|
*viewport,
|
|
);
|
|
}
|
|
}
|