feat!(widget): rewrite button & icon widget APIs
This commit is contained in:
Michael Aaron Murphy
Michael Murphy
parent
18debe546d
commit
4e4eeaac12
60 changed files with 2191 additions and 1113 deletions
677
src/widget/button/widget.rs
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677
src/widget/button/widget.rs
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// Copyright 2019 H<>ctor Ram<61>n, Iced contributors
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// Copyright 2023 System76 <info@system76.com>
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// SPDX-License-Identifier: MIT
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//! Allow your users to perform actions by pressing a button.
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//!
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//! A [`Button`] has some local [`State`].
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use iced_runtime::core::widget::Id;
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use iced_runtime::{keyboard, Command};
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use iced_core::event::{self, Event};
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use iced_core::layout;
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use iced_core::mouse;
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use iced_core::overlay;
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use iced_core::renderer;
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use iced_core::touch;
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use iced_core::widget::tree::{self, Tree};
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use iced_core::widget::Operation;
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use iced_core::{
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Background, Clipboard, Color, Element, Layout, Length, Padding, Point, Rectangle, Shell,
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Vector, Widget,
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};
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use iced_renderer::core::widget::{operation, OperationOutputWrapper};
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pub use super::style::{Appearance, StyleSheet};
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/// A generic widget that produces a message when pressed.
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///
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/// ```no_run
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/// # type Button<'a, Message> =
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/// # iced_widget::Button<'a, Message, iced_widget::renderer::Renderer<iced_widget::style::Theme>>;
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/// #
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/// #[derive(Clone)]
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/// enum Message {
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/// ButtonPressed,
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/// }
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///
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/// let button = Button::new("Press me!").on_press(Message::ButtonPressed);
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/// ```
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///
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/// If a [`Button::on_press`] handler is not set, the resulting [`Button`] will
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/// be disabled:
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///
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/// ```
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/// # type Button<'a, Message> =
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/// # iced_widget::Button<'a, Message, iced_widget::renderer::Renderer<iced_widget::style::Theme>>;
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/// #
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/// #[derive(Clone)]
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/// enum Message {
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/// ButtonPressed,
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/// }
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///
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/// fn disabled_button<'a>() -> Button<'a, Message> {
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/// Button::new("I'm disabled!")
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/// }
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///
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/// fn enabled_button<'a>() -> Button<'a, Message> {
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/// disabled_button().on_press(Message::ButtonPressed)
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/// }
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/// ```
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#[allow(missing_debug_implementations)]
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#[must_use]
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pub struct Button<'a, Message, Renderer>
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where
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Renderer: iced_core::Renderer,
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Renderer::Theme: StyleSheet,
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{
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id: Id,
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#[cfg(feature = "a11y")]
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name: Option<Cow<'a, str>>,
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#[cfg(feature = "a11y")]
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description: Option<iced_accessibility::Description<'a>>,
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#[cfg(feature = "a11y")]
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label: Option<Vec<iced_accessibility::accesskit::NodeId>>,
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content: Element<'a, Message, Renderer>,
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on_press: Option<Message>,
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width: Length,
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height: Length,
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padding: Padding,
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style: <Renderer::Theme as StyleSheet>::Style,
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}
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impl<'a, Message, Renderer> Button<'a, Message, Renderer>
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where
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Renderer: iced_core::Renderer,
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Renderer::Theme: StyleSheet,
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{
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/// Creates a new [`Button`] with the given content.
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pub fn new(content: impl Into<Element<'a, Message, Renderer>>) -> Self {
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Button {
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id: Id::unique(),
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#[cfg(feature = "a11y")]
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name: None,
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#[cfg(feature = "a11y")]
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description: None,
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#[cfg(feature = "a11y")]
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label: None,
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content: content.into(),
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on_press: None,
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width: Length::Shrink,
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height: Length::Shrink,
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padding: Padding::new(5.0),
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style: <Renderer::Theme as StyleSheet>::Style::default(),
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}
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}
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/// Sets the width of the [`Button`].
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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 height of the [`Button`].
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pub fn height(mut self, height: impl Into<Length>) -> Self {
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self.height = height.into();
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self
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}
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/// Sets the [`Padding`] of the [`Button`].
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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 message that will be produced when the [`Button`] is pressed.
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///
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/// Unless `on_press` is called, the [`Button`] will be disabled.
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pub fn on_press(mut self, on_press: Message) -> Self {
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self.on_press = Some(on_press);
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self
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}
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/// Sets the message that will be produced when the [`Button`] is pressed,
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/// if `Some`.
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///
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/// If `None`, the [`Button`] will be disabled.
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pub fn on_press_maybe(mut self, on_press: Option<Message>) -> Self {
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self.on_press = on_press;
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self
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}
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/// Sets the style variant of this [`Button`].
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pub fn style(mut self, style: <Renderer::Theme as StyleSheet>::Style) -> Self {
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self.style = style;
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self
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}
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/// Sets the [`Id`] of the [`Button`].
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pub fn id(mut self, id: Id) -> Self {
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self.id = id;
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self
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}
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#[cfg(feature = "a11y")]
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/// Sets the name of the [`Button`].
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pub fn name(mut self, name: impl Into<Cow<'a, str>>) -> Self {
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self.name = Some(name.into());
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self
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}
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#[cfg(feature = "a11y")]
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/// Sets the description of the [`Button`].
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pub fn description_widget<T: iced_accessibility::Describes>(mut self, description: &T) -> Self {
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self.description = Some(iced_accessibility::Description::Id(
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description.description(),
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));
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self
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}
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#[cfg(feature = "a11y")]
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/// Sets the description of the [`Button`].
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pub fn description(mut self, description: impl Into<Cow<'a, str>>) -> Self {
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self.description = Some(iced_accessibility::Description::Text(description.into()));
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self
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}
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#[cfg(feature = "a11y")]
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/// Sets the label of the [`Button`].
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pub fn label(mut self, label: &dyn iced_accessibility::Labels) -> Self {
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self.label = Some(label.label().into_iter().map(|l| l.into()).collect());
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self
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}
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}
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impl<'a, Message, Renderer> Widget<Message, Renderer> for Button<'a, Message, Renderer>
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where
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Message: 'a + Clone,
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Renderer: 'a + iced_core::Renderer,
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Renderer::Theme: StyleSheet,
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{
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fn tag(&self) -> tree::Tag {
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tree::Tag::of::<State>()
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}
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fn state(&self) -> tree::State {
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tree::State::new(State::new())
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}
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fn children(&self) -> Vec<Tree> {
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vec![Tree::new(&self.content)]
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}
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fn diff(&mut self, tree: &mut Tree) {
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tree.diff_children(std::slice::from_mut(&mut self.content));
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}
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fn width(&self) -> Length {
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self.width
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}
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fn height(&self) -> Length {
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self.height
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}
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fn layout(&self, renderer: &Renderer, limits: &layout::Limits) -> layout::Node {
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layout(
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renderer,
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limits,
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self.width,
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self.height,
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self.padding,
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|renderer, limits| self.content.as_widget().layout(renderer, limits),
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)
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}
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fn operate(
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&self,
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tree: &mut Tree,
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layout: Layout<'_>,
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renderer: &Renderer,
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operation: &mut dyn Operation<OperationOutputWrapper<Message>>,
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) {
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operation.container(None, layout.bounds(), &mut |operation| {
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self.content.as_widget().operate(
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&mut tree.children[0],
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layout.children().next().unwrap(),
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renderer,
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operation,
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);
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});
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let state = tree.state.downcast_mut::<State>();
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operation.focusable(state, Some(&self.id));
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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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if let event::Status::Captured = self.content.as_widget_mut().on_event(
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&mut tree.children[0],
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event.clone(),
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layout.children().next().unwrap(),
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cursor,
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renderer,
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clipboard,
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shell,
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viewport,
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) {
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return event::Status::Captured;
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}
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update(
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self.id.clone(),
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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_press,
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|| tree.state.downcast_mut::<State>(),
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)
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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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renderer_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 bounds = layout.bounds();
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let content_layout = layout.children().next().unwrap();
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let styling = draw(
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renderer,
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bounds,
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cursor,
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self.on_press.is_some(),
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theme,
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&self.style,
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|| tree.state.downcast_ref::<State>(),
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);
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self.content.as_widget().draw(
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&tree.children[0],
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renderer,
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theme,
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&renderer::Style {
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icon_color: styling.icon_color.unwrap_or(renderer_style.icon_color),
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text_color: styling.text_color,
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scale_factor: renderer_style.scale_factor,
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},
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content_layout,
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cursor,
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&bounds,
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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, self.on_press.is_some())
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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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self.content.as_widget_mut().overlay(
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&mut tree.children[0],
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layout.children().next().unwrap(),
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renderer,
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)
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}
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#[cfg(feature = "a11y")]
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/// get the a11y nodes for the widget
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fn a11y_nodes(
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&self,
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layout: Layout<'_>,
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state: &Tree,
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p: mouse::Cursor,
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) -> iced_accessibility::A11yTree {
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use iced_accessibility::{
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accesskit::{Action, DefaultActionVerb, NodeBuilder, NodeId, Rect, Role},
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A11yNode, A11yTree,
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};
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let child_layout = layout.children().next().unwrap();
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let child_tree = &state.children[0];
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let child_tree = self
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.content
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.as_widget()
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.a11y_nodes(child_layout, &child_tree, p);
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let Rectangle {
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x,
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y,
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width,
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height,
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} = layout.bounds();
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let bounds = Rect::new(x as f64, y as f64, (x + width) as f64, (y + height) as f64);
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let is_hovered = state.state.downcast_ref::<State>().is_hovered;
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let mut node = NodeBuilder::new(Role::Button);
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node.add_action(Action::Focus);
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node.add_action(Action::Default);
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node.set_bounds(bounds);
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if let Some(name) = self.name.as_ref() {
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node.set_name(name.clone());
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}
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match self.description.as_ref() {
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Some(iced_accessibility::Description::Id(id)) => {
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node.set_described_by(
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id.iter()
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.cloned()
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.map(|id| NodeId::from(id))
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.collect::<Vec<_>>(),
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);
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}
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Some(iced_accessibility::Description::Text(text)) => {
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node.set_description(text.clone());
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}
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None => {}
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}
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if let Some(label) = self.label.as_ref() {
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node.set_labelled_by(label.clone());
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}
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if self.on_press.is_none() {
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node.set_disabled()
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}
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if is_hovered {
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node.set_hovered()
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}
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node.set_default_action_verb(DefaultActionVerb::Click);
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A11yTree::node_with_child_tree(A11yNode::new(node, self.id.clone()), child_tree)
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}
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fn id(&self) -> Option<Id> {
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Some(self.id.clone())
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}
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fn set_id(&mut self, id: Id) {
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self.id = id;
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}
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}
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impl<'a, Message, Renderer> From<Button<'a, Message, Renderer>> for Element<'a, Message, Renderer>
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where
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Message: Clone + 'a,
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Renderer: iced_core::Renderer + 'a,
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Renderer::Theme: StyleSheet,
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{
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fn from(button: Button<'a, Message, Renderer>) -> Self {
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Self::new(button)
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}
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}
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/// The local state of a [`Button`].
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
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pub struct State {
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is_hovered: bool,
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is_pressed: bool,
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is_focused: bool,
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}
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impl State {
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/// Creates a new [`State`].
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pub fn new() -> State {
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State::default()
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}
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/// Returns whether the [`Button`] is currently focused or not.
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pub fn is_focused(self) -> bool {
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self.is_focused
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}
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/// Returns whether the [`Button`] is currently hovered or not.
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pub fn is_hovered(self) -> bool {
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self.is_hovered
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}
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/// Focuses the [`Button`].
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pub fn focus(&mut self) {
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self.is_focused = true;
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}
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/// Unfocuses the [`Button`].
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pub fn unfocus(&mut self) {
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self.is_focused = false;
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}
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}
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/// Processes the given [`Event`] and updates the [`State`] of a [`Button`]
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/// accordingly.
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#[allow(clippy::needless_pass_by_value)]
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pub fn update<'a, Message: Clone>(
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_id: Id,
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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_press: &Option<Message>,
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state: impl FnOnce() -> &'a mut State,
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) -> event::Status {
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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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if on_press.is_some() {
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let bounds = layout.bounds();
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if cursor.is_over(bounds) {
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let state = state();
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state.is_pressed = true;
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return event::Status::Captured;
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}
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}
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}
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Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left))
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| Event::Touch(touch::Event::FingerLifted { .. }) => {
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if let Some(on_press) = on_press.clone() {
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let state = state();
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if state.is_pressed {
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state.is_pressed = false;
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let bounds = layout.bounds();
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if cursor.is_over(bounds) {
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shell.publish(on_press);
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}
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return event::Status::Captured;
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}
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}
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}
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#[cfg(feature = "a11y")]
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Event::A11y(event_id, iced_accessibility::accesskit::ActionRequest { action, .. }) => {
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let state = state();
|
||||
if let Some(Some(on_press)) = (id == event_id
|
||||
&& matches!(action, iced_accessibility::accesskit::Action::Default))
|
||||
.then(|| on_press.clone())
|
||||
{
|
||||
state.is_pressed = false;
|
||||
shell.publish(on_press);
|
||||
}
|
||||
return event::Status::Captured;
|
||||
}
|
||||
Event::Keyboard(keyboard::Event::KeyPressed { key_code, .. }) => {
|
||||
if let Some(on_press) = on_press.clone() {
|
||||
let state = state();
|
||||
if state.is_focused && key_code == keyboard::KeyCode::Enter {
|
||||
state.is_pressed = true;
|
||||
shell.publish(on_press);
|
||||
return event::Status::Captured;
|
||||
}
|
||||
}
|
||||
}
|
||||
Event::Touch(touch::Event::FingerLost { .. }) | Event::Mouse(mouse::Event::CursorLeft) => {
|
||||
let state = state();
|
||||
state.is_hovered = false;
|
||||
state.is_pressed = false;
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
|
||||
event::Status::Ignored
|
||||
}
|
||||
|
||||
/// Draws a [`Button`].
|
||||
pub fn draw<'a, Renderer: iced_core::Renderer>(
|
||||
renderer: &mut Renderer,
|
||||
bounds: Rectangle,
|
||||
cursor: mouse::Cursor,
|
||||
is_enabled: bool,
|
||||
style_sheet: &dyn StyleSheet<Style = <Renderer::Theme as StyleSheet>::Style>,
|
||||
style: &<Renderer::Theme as StyleSheet>::Style,
|
||||
state: impl FnOnce() -> &'a State,
|
||||
) -> Appearance
|
||||
where
|
||||
Renderer::Theme: StyleSheet,
|
||||
{
|
||||
let is_mouse_over = cursor.position().is_some_and(|p| bounds.contains(p));
|
||||
|
||||
let state: &State = state();
|
||||
|
||||
let styling = if !is_enabled {
|
||||
style_sheet.disabled(style)
|
||||
} else if is_mouse_over {
|
||||
if state.is_pressed {
|
||||
style_sheet.pressed(state.is_focused, style)
|
||||
} else {
|
||||
style_sheet.hovered(state.is_focused, style)
|
||||
}
|
||||
} else {
|
||||
style_sheet.active(state.is_focused, style)
|
||||
};
|
||||
|
||||
let doubled_border_width = styling.border_width * 2.0;
|
||||
let doubled_outline_width = styling.outline_width * 2.0;
|
||||
|
||||
if styling.outline_width > 0.0 {
|
||||
renderer.fill_quad(
|
||||
renderer::Quad {
|
||||
bounds: Rectangle {
|
||||
x: bounds.x - styling.border_width - styling.outline_width,
|
||||
y: bounds.y - styling.border_width - styling.outline_width,
|
||||
width: bounds.width + doubled_border_width + doubled_outline_width,
|
||||
height: bounds.height + doubled_border_width + doubled_outline_width,
|
||||
},
|
||||
border_radius: styling.border_radius,
|
||||
border_width: styling.outline_width,
|
||||
border_color: styling.outline_color,
|
||||
},
|
||||
Color::TRANSPARENT,
|
||||
);
|
||||
}
|
||||
|
||||
if styling.background.is_some() || styling.border_width > 0.0 {
|
||||
if styling.shadow_offset != Vector::default() {
|
||||
// TODO: Implement proper shadow support
|
||||
renderer.fill_quad(
|
||||
renderer::Quad {
|
||||
bounds: Rectangle {
|
||||
x: bounds.x + styling.shadow_offset.x,
|
||||
y: bounds.y + styling.shadow_offset.y,
|
||||
..bounds
|
||||
},
|
||||
border_radius: styling.border_radius,
|
||||
border_width: 0.0,
|
||||
border_color: Color::TRANSPARENT,
|
||||
},
|
||||
Background::Color([0.0, 0.0, 0.0, 0.5].into()),
|
||||
);
|
||||
}
|
||||
|
||||
renderer.fill_quad(
|
||||
renderer::Quad {
|
||||
bounds,
|
||||
border_radius: styling.border_radius,
|
||||
border_width: styling.border_width,
|
||||
border_color: styling.border_color,
|
||||
},
|
||||
styling
|
||||
.background
|
||||
.unwrap_or(Background::Color(Color::TRANSPARENT)),
|
||||
);
|
||||
}
|
||||
|
||||
styling
|
||||
}
|
||||
|
||||
/// Computes the layout of a [`Button`].
|
||||
pub fn layout<Renderer>(
|
||||
renderer: &Renderer,
|
||||
limits: &layout::Limits,
|
||||
width: Length,
|
||||
height: Length,
|
||||
padding: Padding,
|
||||
layout_content: impl FnOnce(&Renderer, &layout::Limits) -> layout::Node,
|
||||
) -> layout::Node {
|
||||
let limits = limits.width(width).height(height);
|
||||
|
||||
let mut content = layout_content(renderer, &limits.pad(padding));
|
||||
let padding = padding.fit(content.size(), limits.max());
|
||||
let size = limits.pad(padding).resolve(content.size()).pad(padding);
|
||||
|
||||
content.move_to(Point::new(padding.left, padding.top));
|
||||
|
||||
layout::Node::with_children(size, vec![content])
|
||||
}
|
||||
|
||||
/// Returns the [`mouse::Interaction`] of a [`Button`].
|
||||
#[must_use]
|
||||
pub fn mouse_interaction(
|
||||
layout: Layout<'_>,
|
||||
cursor: mouse::Cursor,
|
||||
is_enabled: bool,
|
||||
) -> mouse::Interaction {
|
||||
let is_mouse_over = cursor.is_over(layout.bounds());
|
||||
|
||||
if is_mouse_over && is_enabled {
|
||||
mouse::Interaction::Pointer
|
||||
} else {
|
||||
mouse::Interaction::default()
|
||||
}
|
||||
}
|
||||
|
||||
/// Produces a [`Command`] that focuses the [`Button`] with the given [`Id`].
|
||||
pub fn focus<Message: 'static>(id: Id) -> Command<Message> {
|
||||
Command::widget(operation::focusable::focus(id))
|
||||
}
|
||||
|
||||
impl operation::Focusable for State {
|
||||
fn is_focused(&self) -> bool {
|
||||
State::is_focused(*self)
|
||||
}
|
||||
|
||||
fn focus(&mut self) {
|
||||
State::focus(self);
|
||||
}
|
||||
|
||||
fn unfocus(&mut self) {
|
||||
State::unfocus(self);
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue