iced_widget/combo_box.rs
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//! Combo boxes display a dropdown list of searchable and selectable options.
//!
//! # Example
//! ```no_run
//! # mod iced { pub mod widget { pub use iced_widget::*; } pub use iced_widget::Renderer; pub use iced_widget::core::*; }
//! # pub type Element<'a, Message> = iced_widget::core::Element<'a, Message, iced_widget::Theme, iced_widget::Renderer>;
//! #
//! use iced::widget::combo_box;
//!
//! struct State {
//! fruits: combo_box::State<Fruit>,
//! favorite: Option<Fruit>,
//! }
//!
//! #[derive(Debug, Clone)]
//! enum Fruit {
//! Apple,
//! Orange,
//! Strawberry,
//! Tomato,
//! }
//!
//! #[derive(Debug, Clone)]
//! enum Message {
//! FruitSelected(Fruit),
//! }
//!
//! fn view(state: &State) -> Element<'_, Message> {
//! combo_box(
//! &state.fruits,
//! "Select your favorite fruit...",
//! state.favorite.as_ref(),
//! Message::FruitSelected
//! )
//! .into()
//! }
//!
//! fn update(state: &mut State, message: Message) {
//! match message {
//! Message::FruitSelected(fruit) => {
//! state.favorite = Some(fruit);
//! }
//! }
//! }
//!
//! impl std::fmt::Display for Fruit {
//! fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
//! f.write_str(match self {
//! Self::Apple => "Apple",
//! Self::Orange => "Orange",
//! Self::Strawberry => "Strawberry",
//! Self::Tomato => "Tomato",
//! })
//! }
//! }
//! ```
use crate::core::keyboard;
use crate::core::keyboard::key;
use crate::core::layout::{self, Layout};
use crate::core::mouse;
use crate::core::overlay;
use crate::core::renderer;
use crate::core::text;
use crate::core::time::Instant;
use crate::core::widget::{self, Widget};
use crate::core::window;
use crate::core::{
Clipboard, Element, Event, Length, Padding, Rectangle, Shell, Size, Theme,
Vector,
};
use crate::overlay::menu;
use crate::text::LineHeight;
use crate::text_input::{self, TextInput};
use std::cell::RefCell;
use std::fmt::Display;
/// A widget for searching and selecting a single value from a list of options.
///
/// # Example
/// ```no_run
/// # mod iced { pub mod widget { pub use iced_widget::*; } pub use iced_widget::Renderer; pub use iced_widget::core::*; }
/// # pub type Element<'a, Message> = iced_widget::core::Element<'a, Message, iced_widget::Theme, iced_widget::Renderer>;
/// #
/// use iced::widget::combo_box;
///
/// struct State {
/// fruits: combo_box::State<Fruit>,
/// favorite: Option<Fruit>,
/// }
///
/// #[derive(Debug, Clone)]
/// enum Fruit {
/// Apple,
/// Orange,
/// Strawberry,
/// Tomato,
/// }
///
/// #[derive(Debug, Clone)]
/// enum Message {
/// FruitSelected(Fruit),
/// }
///
/// fn view(state: &State) -> Element<'_, Message> {
/// combo_box(
/// &state.fruits,
/// "Select your favorite fruit...",
/// state.favorite.as_ref(),
/// Message::FruitSelected
/// )
/// .into()
/// }
///
/// fn update(state: &mut State, message: Message) {
/// match message {
/// Message::FruitSelected(fruit) => {
/// state.favorite = Some(fruit);
/// }
/// }
/// }
///
/// impl std::fmt::Display for Fruit {
/// fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
/// f.write_str(match self {
/// Self::Apple => "Apple",
/// Self::Orange => "Orange",
/// Self::Strawberry => "Strawberry",
/// Self::Tomato => "Tomato",
/// })
/// }
/// }
/// ```
#[allow(missing_debug_implementations)]
pub struct ComboBox<
'a,
T,
Message,
Theme = crate::Theme,
Renderer = crate::Renderer,
> where
Theme: Catalog,
Renderer: text::Renderer,
{
state: &'a State<T>,
text_input: TextInput<'a, TextInputEvent, Theme, Renderer>,
font: Option<Renderer::Font>,
selection: text_input::Value,
on_selected: Box<dyn Fn(T) -> Message>,
on_option_hovered: Option<Box<dyn Fn(T) -> Message>>,
on_open: Option<Message>,
on_close: Option<Message>,
on_input: Option<Box<dyn Fn(String) -> Message>>,
menu_class: <Theme as menu::Catalog>::Class<'a>,
padding: Padding,
size: Option<f32>,
}
impl<'a, T, Message, Theme, Renderer> ComboBox<'a, T, Message, Theme, Renderer>
where
T: std::fmt::Display + Clone,
Theme: Catalog,
Renderer: text::Renderer,
{
/// Creates a new [`ComboBox`] with the given list of options, a placeholder,
/// the current selected value, and the message to produce when an option is
/// selected.
pub fn new(
state: &'a State<T>,
placeholder: &str,
selection: Option<&T>,
on_selected: impl Fn(T) -> Message + 'static,
) -> Self {
let text_input = TextInput::new(placeholder, &state.value())
.on_input(TextInputEvent::TextChanged)
.class(Theme::default_input());
let selection = selection.map(T::to_string).unwrap_or_default();
Self {
state,
text_input,
font: None,
selection: text_input::Value::new(&selection),
on_selected: Box::new(on_selected),
on_option_hovered: None,
on_input: None,
on_open: None,
on_close: None,
menu_class: <Theme as Catalog>::default_menu(),
padding: text_input::DEFAULT_PADDING,
size: None,
}
}
/// Sets the message that should be produced when some text is typed into
/// the [`TextInput`] of the [`ComboBox`].
pub fn on_input(
mut self,
on_input: impl Fn(String) -> Message + 'static,
) -> Self {
self.on_input = Some(Box::new(on_input));
self
}
/// Sets the message that will be produced when an option of the
/// [`ComboBox`] is hovered using the arrow keys.
pub fn on_option_hovered(
mut self,
on_option_hovered: impl Fn(T) -> Message + 'static,
) -> Self {
self.on_option_hovered = Some(Box::new(on_option_hovered));
self
}
/// Sets the message that will be produced when the [`ComboBox`] is
/// opened.
pub fn on_open(mut self, message: Message) -> Self {
self.on_open = Some(message);
self
}
/// Sets the message that will be produced when the outside area
/// of the [`ComboBox`] is pressed.
pub fn on_close(mut self, message: Message) -> Self {
self.on_close = Some(message);
self
}
/// Sets the [`Padding`] of the [`ComboBox`].
pub fn padding(mut self, padding: impl Into<Padding>) -> Self {
self.padding = padding.into();
self.text_input = self.text_input.padding(self.padding);
self
}
/// Sets the [`Renderer::Font`] of the [`ComboBox`].
///
/// [`Renderer::Font`]: text::Renderer
pub fn font(mut self, font: Renderer::Font) -> Self {
self.text_input = self.text_input.font(font);
self.font = Some(font);
self
}
/// Sets the [`text_input::Icon`] of the [`ComboBox`].
pub fn icon(mut self, icon: text_input::Icon<Renderer::Font>) -> Self {
self.text_input = self.text_input.icon(icon);
self
}
/// Sets the text sixe of the [`ComboBox`].
pub fn size(mut self, size: f32) -> Self {
self.text_input = self.text_input.size(size);
self.size = Some(size);
self
}
/// Sets the [`LineHeight`] of the [`ComboBox`].
pub fn line_height(self, line_height: impl Into<LineHeight>) -> Self {
Self {
text_input: self.text_input.line_height(line_height),
..self
}
}
/// Sets the width of the [`ComboBox`].
pub fn width(self, width: impl Into<Length>) -> Self {
Self {
text_input: self.text_input.width(width),
..self
}
}
/// Sets the style of the input of the [`ComboBox`].
#[must_use]
pub fn input_style(
mut self,
style: impl Fn(&Theme, text_input::Status) -> text_input::Style + 'a,
) -> Self
where
<Theme as text_input::Catalog>::Class<'a>:
From<text_input::StyleFn<'a, Theme>>,
{
self.text_input = self.text_input.style(style);
self
}
/// Sets the style of the menu of the [`ComboBox`].
#[must_use]
pub fn menu_style(
mut self,
style: impl Fn(&Theme) -> menu::Style + 'a,
) -> Self
where
<Theme as menu::Catalog>::Class<'a>: From<menu::StyleFn<'a, Theme>>,
{
self.menu_class = (Box::new(style) as menu::StyleFn<'a, Theme>).into();
self
}
/// Sets the style class of the input of the [`ComboBox`].
#[cfg(feature = "advanced")]
#[must_use]
pub fn input_class(
mut self,
class: impl Into<<Theme as text_input::Catalog>::Class<'a>>,
) -> Self {
self.text_input = self.text_input.class(class);
self
}
/// Sets the style class of the menu of the [`ComboBox`].
#[cfg(feature = "advanced")]
#[must_use]
pub fn menu_class(
mut self,
class: impl Into<<Theme as menu::Catalog>::Class<'a>>,
) -> Self {
self.menu_class = class.into();
self
}
}
/// The local state of a [`ComboBox`].
#[derive(Debug, Clone)]
pub struct State<T> {
options: Vec<T>,
inner: RefCell<Inner<T>>,
}
#[derive(Debug, Clone)]
struct Inner<T> {
value: String,
option_matchers: Vec<String>,
filtered_options: Filtered<T>,
}
#[derive(Debug, Clone)]
struct Filtered<T> {
options: Vec<T>,
updated: Instant,
}
impl<T> State<T>
where
T: Display + Clone,
{
/// Creates a new [`State`] for a [`ComboBox`] with the given list of options.
pub fn new(options: Vec<T>) -> Self {
Self::with_selection(options, None)
}
/// Creates a new [`State`] for a [`ComboBox`] with the given list of options
/// and selected value.
pub fn with_selection(options: Vec<T>, selection: Option<&T>) -> Self {
let value = selection.map(T::to_string).unwrap_or_default();
// Pre-build "matcher" strings ahead of time so that search is fast
let option_matchers = build_matchers(&options);
let filtered_options = Filtered::new(
search(&options, &option_matchers, &value)
.cloned()
.collect(),
);
Self {
options,
inner: RefCell::new(Inner {
value,
option_matchers,
filtered_options,
}),
}
}
/// Returns the options of the [`State`].
///
/// These are the options provided when the [`State`]
/// was constructed with [`State::new`].
pub fn options(&self) -> &[T] {
&self.options
}
fn value(&self) -> String {
let inner = self.inner.borrow();
inner.value.clone()
}
fn with_inner<O>(&self, f: impl FnOnce(&Inner<T>) -> O) -> O {
let inner = self.inner.borrow();
f(&inner)
}
fn with_inner_mut(&self, f: impl FnOnce(&mut Inner<T>)) {
let mut inner = self.inner.borrow_mut();
f(&mut inner);
}
fn sync_filtered_options(&self, options: &mut Filtered<T>) {
let inner = self.inner.borrow();
inner.filtered_options.sync(options);
}
}
impl<T> Default for State<T>
where
T: Display + Clone,
{
fn default() -> Self {
Self::new(Vec::new())
}
}
impl<T> Filtered<T>
where
T: Clone,
{
fn new(options: Vec<T>) -> Self {
Self {
options,
updated: Instant::now(),
}
}
fn empty() -> Self {
Self {
options: vec![],
updated: Instant::now(),
}
}
fn update(&mut self, options: Vec<T>) {
self.options = options;
self.updated = Instant::now();
}
fn sync(&self, other: &mut Filtered<T>) {
if other.updated != self.updated {
*other = self.clone();
}
}
}
struct Menu<T> {
menu: menu::State,
hovered_option: Option<usize>,
new_selection: Option<T>,
filtered_options: Filtered<T>,
}
#[derive(Debug, Clone)]
enum TextInputEvent {
TextChanged(String),
}
impl<T, Message, Theme, Renderer> Widget<Message, Theme, Renderer>
for ComboBox<'_, T, Message, Theme, Renderer>
where
T: Display + Clone + 'static,
Message: Clone,
Theme: Catalog,
Renderer: text::Renderer,
{
fn size(&self) -> Size<Length> {
Widget::<TextInputEvent, Theme, Renderer>::size(&self.text_input)
}
fn layout(
&self,
tree: &mut widget::Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let is_focused = {
let text_input_state = tree.children[0]
.state
.downcast_ref::<text_input::State<Renderer::Paragraph>>();
text_input_state.is_focused()
};
self.text_input.layout(
&mut tree.children[0],
renderer,
limits,
(!is_focused).then_some(&self.selection),
)
}
fn tag(&self) -> widget::tree::Tag {
widget::tree::Tag::of::<Menu<T>>()
}
fn state(&self) -> widget::tree::State {
widget::tree::State::new(Menu::<T> {
menu: menu::State::new(),
filtered_options: Filtered::empty(),
hovered_option: Some(0),
new_selection: None,
})
}
fn children(&self) -> Vec<widget::Tree> {
vec![widget::Tree::new(&self.text_input as &dyn Widget<_, _, _>)]
}
fn update(
&mut self,
tree: &mut widget::Tree,
event: Event,
layout: Layout<'_>,
cursor: mouse::Cursor,
renderer: &Renderer,
clipboard: &mut dyn Clipboard,
shell: &mut Shell<'_, Message>,
viewport: &Rectangle,
) {
let menu = tree.state.downcast_mut::<Menu<T>>();
let started_focused = {
let text_input_state = tree.children[0]
.state
.downcast_ref::<text_input::State<Renderer::Paragraph>>();
text_input_state.is_focused()
};
// This is intended to check whether or not the message buffer was empty,
// since `Shell` does not expose such functionality.
let mut published_message_to_shell = false;
// Create a new list of local messages
let mut local_messages = Vec::new();
let mut local_shell = Shell::new(&mut local_messages);
// Provide it to the widget
self.text_input.update(
&mut tree.children[0],
event.clone(),
layout,
cursor,
renderer,
clipboard,
&mut local_shell,
viewport,
);
if local_shell.is_event_captured() {
shell.capture_event();
}
if let Some(redraw_request) = local_shell.redraw_request() {
match redraw_request {
window::RedrawRequest::NextFrame => {
shell.request_redraw();
}
window::RedrawRequest::At(at) => {
shell.request_redraw_at(at);
}
}
}
// Then finally react to them here
for message in local_messages {
let TextInputEvent::TextChanged(new_value) = message;
if let Some(on_input) = &self.on_input {
shell.publish((on_input)(new_value.clone()));
}
// Couple the filtered options with the `ComboBox`
// value and only recompute them when the value changes,
// instead of doing it in every `view` call
self.state.with_inner_mut(|state| {
menu.hovered_option = Some(0);
state.value = new_value;
state.filtered_options.update(
search(
&self.state.options,
&state.option_matchers,
&state.value,
)
.cloned()
.collect(),
);
});
shell.invalidate_layout();
shell.request_redraw();
}
let is_focused = {
let text_input_state = tree.children[0]
.state
.downcast_ref::<text_input::State<Renderer::Paragraph>>();
text_input_state.is_focused()
};
if is_focused {
self.state.with_inner(|state| {
if !started_focused {
if let Some(on_option_hovered) = &mut self.on_option_hovered
{
let hovered_option = menu.hovered_option.unwrap_or(0);
if let Some(option) =
state.filtered_options.options.get(hovered_option)
{
shell.publish(on_option_hovered(option.clone()));
published_message_to_shell = true;
}
}
}
if let Event::Keyboard(keyboard::Event::KeyPressed {
key: keyboard::Key::Named(named_key),
modifiers,
..
}) = event
{
let shift_modifier = modifiers.shift();
match (named_key, shift_modifier) {
(key::Named::Enter, _) => {
if let Some(index) = &menu.hovered_option {
if let Some(option) =
state.filtered_options.options.get(*index)
{
menu.new_selection = Some(option.clone());
}
}
shell.capture_event();
shell.request_redraw();
}
(key::Named::ArrowUp, _) | (key::Named::Tab, true) => {
if let Some(index) = &mut menu.hovered_option {
if *index == 0 {
*index = state
.filtered_options
.options
.len()
.saturating_sub(1);
} else {
*index = index.saturating_sub(1);
}
} else {
menu.hovered_option = Some(0);
}
if let Some(on_option_hovered) =
&mut self.on_option_hovered
{
if let Some(option) =
menu.hovered_option.and_then(|index| {
state
.filtered_options
.options
.get(index)
})
{
// Notify the selection
shell.publish((on_option_hovered)(
option.clone(),
));
published_message_to_shell = true;
}
}
shell.capture_event();
shell.request_redraw();
}
(key::Named::ArrowDown, _)
| (key::Named::Tab, false)
if !modifiers.shift() =>
{
if let Some(index) = &mut menu.hovered_option {
if *index
>= state
.filtered_options
.options
.len()
.saturating_sub(1)
{
*index = 0;
} else {
*index = index.saturating_add(1).min(
state
.filtered_options
.options
.len()
.saturating_sub(1),
);
}
} else {
menu.hovered_option = Some(0);
}
if let Some(on_option_hovered) =
&mut self.on_option_hovered
{
if let Some(option) =
menu.hovered_option.and_then(|index| {
state
.filtered_options
.options
.get(index)
})
{
// Notify the selection
shell.publish((on_option_hovered)(
option.clone(),
));
published_message_to_shell = true;
}
}
shell.capture_event();
shell.request_redraw();
}
_ => {}
}
}
});
}
// If the overlay menu has selected something
self.state.with_inner_mut(|state| {
if let Some(selection) = menu.new_selection.take() {
// Clear the value and reset the options and menu
state.value = String::new();
state.filtered_options.update(self.state.options.clone());
menu.menu = menu::State::default();
// Notify the selection
shell.publish((self.on_selected)(selection));
published_message_to_shell = true;
// Unfocus the input
self.text_input.update(
&mut tree.children[0],
Event::Mouse(mouse::Event::ButtonPressed(
mouse::Button::Left,
)),
layout,
mouse::Cursor::Unavailable,
renderer,
clipboard,
&mut Shell::new(&mut vec![]),
viewport,
);
}
});
let is_focused = {
let text_input_state = tree.children[0]
.state
.downcast_ref::<text_input::State<Renderer::Paragraph>>();
text_input_state.is_focused()
};
if started_focused != is_focused {
// Focus changed, invalidate widget tree to force a fresh `view`
shell.invalidate_widgets();
if !published_message_to_shell {
if is_focused {
if let Some(on_open) = self.on_open.take() {
shell.publish(on_open);
}
} else if let Some(on_close) = self.on_close.take() {
shell.publish(on_close);
}
}
}
}
fn mouse_interaction(
&self,
tree: &widget::Tree,
layout: Layout<'_>,
cursor: mouse::Cursor,
viewport: &Rectangle,
renderer: &Renderer,
) -> mouse::Interaction {
self.text_input.mouse_interaction(
&tree.children[0],
layout,
cursor,
viewport,
renderer,
)
}
fn draw(
&self,
tree: &widget::Tree,
renderer: &mut Renderer,
theme: &Theme,
_style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
viewport: &Rectangle,
) {
let is_focused = {
let text_input_state = tree.children[0]
.state
.downcast_ref::<text_input::State<Renderer::Paragraph>>();
text_input_state.is_focused()
};
let selection = if is_focused || self.selection.is_empty() {
None
} else {
Some(&self.selection)
};
self.text_input.draw(
&tree.children[0],
renderer,
theme,
layout,
cursor,
selection,
viewport,
);
}
fn overlay<'b>(
&'b mut self,
tree: &'b mut widget::Tree,
layout: Layout<'_>,
_renderer: &Renderer,
translation: Vector,
) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
let is_focused = {
let text_input_state = tree.children[0]
.state
.downcast_ref::<text_input::State<Renderer::Paragraph>>();
text_input_state.is_focused()
};
if is_focused {
let Menu {
menu,
filtered_options,
hovered_option,
..
} = tree.state.downcast_mut::<Menu<T>>();
self.state.sync_filtered_options(filtered_options);
if filtered_options.options.is_empty() {
None
} else {
let bounds = layout.bounds();
let mut menu = menu::Menu::new(
menu,
&filtered_options.options,
hovered_option,
|x| {
tree.children[0]
.state
.downcast_mut::<text_input::State<Renderer::Paragraph>>(
)
.unfocus();
(self.on_selected)(x)
},
self.on_option_hovered.as_deref(),
&self.menu_class,
)
.width(bounds.width)
.padding(self.padding);
if let Some(font) = self.font {
menu = menu.font(font);
}
if let Some(size) = self.size {
menu = menu.text_size(size);
}
Some(
menu.overlay(
layout.position() + translation,
bounds.height,
),
)
}
} else {
None
}
}
}
impl<'a, T, Message, Theme, Renderer>
From<ComboBox<'a, T, Message, Theme, Renderer>>
for Element<'a, Message, Theme, Renderer>
where
T: Display + Clone + 'static,
Message: Clone + 'a,
Theme: Catalog + 'a,
Renderer: text::Renderer + 'a,
{
fn from(combo_box: ComboBox<'a, T, Message, Theme, Renderer>) -> Self {
Self::new(combo_box)
}
}
/// The theme catalog of a [`ComboBox`].
pub trait Catalog: text_input::Catalog + menu::Catalog {
/// The default class for the text input of the [`ComboBox`].
fn default_input<'a>() -> <Self as text_input::Catalog>::Class<'a> {
<Self as text_input::Catalog>::default()
}
/// The default class for the menu of the [`ComboBox`].
fn default_menu<'a>() -> <Self as menu::Catalog>::Class<'a> {
<Self as menu::Catalog>::default()
}
}
impl Catalog for Theme {}
fn search<'a, T, A>(
options: impl IntoIterator<Item = T> + 'a,
option_matchers: impl IntoIterator<Item = &'a A> + 'a,
query: &'a str,
) -> impl Iterator<Item = T> + 'a
where
A: AsRef<str> + 'a,
{
let query: Vec<String> = query
.to_lowercase()
.split(|c: char| !c.is_ascii_alphanumeric())
.map(String::from)
.collect();
options
.into_iter()
.zip(option_matchers)
// Make sure each part of the query is found in the option
.filter_map(move |(option, matcher)| {
if query.iter().all(|part| matcher.as_ref().contains(part)) {
Some(option)
} else {
None
}
})
}
fn build_matchers<'a, T>(
options: impl IntoIterator<Item = T> + 'a,
) -> Vec<String>
where
T: Display + 'a,
{
options
.into_iter()
.map(|opt| {
let mut matcher = opt.to_string();
matcher.retain(|c| c.is_ascii_alphanumeric());
matcher.to_lowercase()
})
.collect()
}