Integrate diagnostic decorations and current-source Text input boundaries
This commit is contained in:
+752
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//! Buttons allow your users to perform actions by pressing them.
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//!
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//! # Example
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//! ```no_run
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//! # mod iced { pub mod widget { pub use iced_widget::*; } }
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//! # pub type State = ();
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//! # pub type Element<'a, Message> = iced_widget::core::Element<'a, Message, iced_widget::Theme, iced_widget::Renderer>;
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//! use iced::widget::button;
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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 view(state: &State) -> Element<'_, Message> {
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//! button("Press me!").on_press(Message::ButtonPressed).into()
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//! }
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//! ```
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use crate::core::border::{self, Border};
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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::theme::palette;
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use crate::core::touch;
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use crate::core::widget::Operation;
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use crate::core::widget::tree::{self, Tree};
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use crate::core::window;
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use crate::core::{
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Background, Clipboard, Color, Element, Event, Layout, Length, Padding,
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Rectangle, Shadow, Shell, Size, Theme, Vector, Widget,
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};
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/// A generic widget that produces a message when pressed.
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///
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/// # Example
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/// ```no_run
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/// # mod iced { pub mod widget { pub use iced_widget::*; } }
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/// # pub type State = ();
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/// # pub type Element<'a, Message> = iced_widget::core::Element<'a, Message, iced_widget::Theme, iced_widget::Renderer>;
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/// use iced::widget::button;
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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 view(state: &State) -> Element<'_, Message> {
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/// button("Press me!").on_press(Message::ButtonPressed).into()
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/// }
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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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/// ```no_run
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/// # mod iced { pub mod widget { pub use iced_widget::*; } }
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/// # pub type State = ();
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/// # pub type Element<'a, Message> = iced_widget::core::Element<'a, Message, iced_widget::Theme, iced_widget::Renderer>;
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/// use iced::widget::button;
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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 view(state: &State) -> Element<'_, Message> {
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/// button("I am disabled!").into()
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/// }
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/// ```
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pub struct Button<'a, Message, Theme = crate::Theme, Renderer = crate::Renderer>
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where
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Renderer: crate::core::Renderer,
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Theme: Catalog,
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{
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content: Element<'a, Message, Theme, Renderer>,
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on_press: Option<OnPress<'a, Message>>,
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width: Length,
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height: Length,
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padding: Padding,
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clip: bool,
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class: Theme::Class<'a>,
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status: Option<Status>,
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}
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enum OnPress<'a, Message> {
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Direct(Message),
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Closure(Box<dyn Fn() -> Message + 'a>),
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}
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impl<Message: Clone> OnPress<'_, Message> {
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fn get(&self) -> Message {
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match self {
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OnPress::Direct(message) => message.clone(),
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OnPress::Closure(f) => f(),
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}
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}
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}
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impl<'a, Message, Theme, Renderer> Button<'a, Message, Theme, Renderer>
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where
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Renderer: crate::core::Renderer,
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Theme: Catalog,
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{
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/// Creates a new [`Button`] with the given content.
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pub fn new(
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content: impl Into<Element<'a, Message, Theme, Renderer>>,
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) -> Self {
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let content = content.into();
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let size = content.as_widget().size_hint();
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Button {
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content,
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on_press: None,
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width: size.width.fluid(),
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height: size.height.fluid(),
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padding: DEFAULT_PADDING,
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clip: false,
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class: Theme::default(),
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status: None,
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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(OnPress::Direct(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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///
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/// This is analogous to [`Button::on_press`], but using a closure to produce
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/// the message.
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///
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/// This closure will only be called when the [`Button`] is actually pressed and,
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/// therefore, this method is useful to reduce overhead if creating the resulting
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/// message is slow.
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pub fn on_press_with(
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mut self,
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on_press: impl Fn() -> Message + 'a,
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) -> Self {
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self.on_press = Some(OnPress::Closure(Box::new(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.map(OnPress::Direct);
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self
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}
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/// Sets whether the contents of the [`Button`] should be clipped on
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/// overflow.
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pub fn clip(mut self, clip: bool) -> Self {
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self.clip = clip;
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self
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}
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/// Sets the style of the [`Button`].
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#[must_use]
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pub fn style(mut self, style: impl Fn(&Theme, Status) -> Style + 'a) -> Self
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where
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Theme::Class<'a>: From<StyleFn<'a, Theme>>,
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{
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self.class = (Box::new(style) as StyleFn<'a, Theme>).into();
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self
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}
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/// Sets the style class of the [`Button`].
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#[cfg(feature = "advanced")]
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#[must_use]
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pub fn class(mut self, class: impl Into<Theme::Class<'a>>) -> Self {
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self.class = class.into();
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self
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}
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
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struct State {
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is_pressed: bool,
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}
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impl<'a, Message, Theme, Renderer> Widget<Message, Theme, Renderer>
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for Button<'a, Message, Theme, Renderer>
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where
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Message: 'a + Clone,
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Renderer: 'a + crate::core::Renderer,
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Theme: Catalog,
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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::default())
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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(&self, tree: &mut Tree) {
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tree.diff_children(std::slice::from_ref(&self.content));
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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: self.height,
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}
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}
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fn layout(
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&mut 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::padded(
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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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|limits| {
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self.content.as_widget_mut().layout(
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&mut tree.children[0],
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renderer,
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limits,
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)
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},
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)
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}
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fn operate(
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&mut 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,
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) {
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operation.container(None, layout.bounds());
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operation.traverse(&mut |operation| {
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self.content.as_widget_mut().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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}
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fn update(
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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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) {
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self.content.as_widget_mut().update(
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&mut tree.children[0],
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event,
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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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if shell.is_event_captured() {
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return;
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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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if self.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 = tree.state.downcast_mut::<State>();
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state.is_pressed = true;
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shell.capture_event();
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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) = &self.on_press {
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let state = tree.state.downcast_mut::<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.get());
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}
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shell.capture_event();
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}
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}
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}
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Event::Touch(touch::Event::FingerLost { .. }) => {
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let state = tree.state.downcast_mut::<State>();
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state.is_pressed = false;
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}
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_ => {}
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}
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let current_status = if self.on_press.is_none() {
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Status::Disabled
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} else if cursor.is_over(layout.bounds()) {
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let state = tree.state.downcast_ref::<State>();
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if state.is_pressed {
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Status::Pressed
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} else {
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Status::Hovered
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}
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} else {
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Status::Active
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};
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if let Event::Window(window::Event::RedrawRequested(_now)) = event {
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self.status = Some(current_status);
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} else if self.status.is_some_and(|status| status != current_status) {
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shell.request_redraw();
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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: &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 bounds = layout.bounds();
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let content_layout = layout.children().next().unwrap();
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let style =
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theme.style(&self.class, self.status.unwrap_or(Status::Disabled));
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if style.background.is_some()
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|| style.border.width > 0.0
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|| style.shadow.color.a > 0.0
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{
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renderer.fill_quad(
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renderer::Quad {
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bounds,
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border: style.border,
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shadow: style.shadow,
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snap: style.snap,
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},
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style
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.background
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.unwrap_or(Background::Color(Color::TRANSPARENT)),
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);
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}
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let viewport = if self.clip {
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bounds.intersection(viewport).unwrap_or(*viewport)
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} else {
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*viewport
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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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text_color: style.text_color,
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},
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content_layout,
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cursor,
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&viewport,
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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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let is_mouse_over = cursor.is_over(layout.bounds());
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if is_mouse_over && self.on_press.is_some() {
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mouse::Interaction::Pointer
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} else {
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mouse::Interaction::default()
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}
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}
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fn overlay<'b>(
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&'b mut self,
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tree: &'b mut Tree,
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layout: Layout<'b>,
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renderer: &Renderer,
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viewport: &Rectangle,
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translation: Vector,
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) -> Option<overlay::Element<'b, Message, Theme, 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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viewport,
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translation,
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)
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}
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}
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impl<'a, Message, Theme, Renderer> From<Button<'a, Message, Theme, Renderer>>
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for Element<'a, Message, Theme, Renderer>
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where
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Message: Clone + 'a,
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Theme: Catalog + 'a,
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Renderer: crate::core::Renderer + 'a,
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{
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fn from(button: Button<'a, Message, Theme, Renderer>) -> Self {
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Self::new(button)
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}
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}
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/// The default [`Padding`] of a [`Button`].
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pub const DEFAULT_PADDING: Padding = Padding {
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top: 5.0,
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bottom: 5.0,
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right: 10.0,
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left: 10.0,
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};
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/// The possible status of a [`Button`].
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum Status {
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/// The [`Button`] can be pressed.
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Active,
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/// The [`Button`] can be pressed and it is being hovered.
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Hovered,
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/// The [`Button`] is being pressed.
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Pressed,
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/// The [`Button`] cannot be pressed.
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Disabled,
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}
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/// The style of a button.
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||||
///
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/// If not specified with [`Button::style`]
|
||||
/// the theme will provide the style.
|
||||
#[derive(Debug, Clone, Copy, PartialEq)]
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pub struct Style {
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/// The [`Background`] of the button.
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pub background: Option<Background>,
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/// The text [`Color`] of the button.
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pub text_color: Color,
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/// The [`Border`] of the button.
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pub border: Border,
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/// The [`Shadow`] of the button.
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pub shadow: Shadow,
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/// Whether the button should be snapped to the pixel grid.
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||||
pub snap: bool,
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}
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||||
|
||||
impl Style {
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||||
/// Updates the [`Style`] with the given [`Background`].
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||||
pub fn with_background(self, background: impl Into<Background>) -> Self {
|
||||
Self {
|
||||
background: Some(background.into()),
|
||||
..self
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Default for Style {
|
||||
fn default() -> Self {
|
||||
Self {
|
||||
background: None,
|
||||
text_color: Color::BLACK,
|
||||
border: Border::default(),
|
||||
shadow: Shadow::default(),
|
||||
snap: cfg!(feature = "crisp"),
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||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// The theme catalog of a [`Button`].
|
||||
///
|
||||
/// All themes that can be used with [`Button`]
|
||||
/// must implement this trait.
|
||||
///
|
||||
/// # Example
|
||||
/// ```no_run
|
||||
/// # use iced_widget::core::{Color, Background};
|
||||
/// # use iced_widget::button::{Catalog, Status, Style};
|
||||
/// # struct MyTheme;
|
||||
/// #[derive(Debug, Default)]
|
||||
/// pub enum ButtonClass {
|
||||
/// #[default]
|
||||
/// Primary,
|
||||
/// Secondary,
|
||||
/// Danger
|
||||
/// }
|
||||
///
|
||||
/// impl Catalog for MyTheme {
|
||||
/// type Class<'a> = ButtonClass;
|
||||
///
|
||||
/// fn default<'a>() -> Self::Class<'a> {
|
||||
/// ButtonClass::default()
|
||||
/// }
|
||||
///
|
||||
///
|
||||
/// fn style(&self, class: &Self::Class<'_>, status: Status) -> Style {
|
||||
/// let mut style = Style::default();
|
||||
///
|
||||
/// match class {
|
||||
/// ButtonClass::Primary => {
|
||||
/// style.background = Some(Background::Color(Color::from_rgb(0.529, 0.808, 0.921)));
|
||||
/// },
|
||||
/// ButtonClass::Secondary => {
|
||||
/// style.background = Some(Background::Color(Color::WHITE));
|
||||
/// },
|
||||
/// ButtonClass::Danger => {
|
||||
/// style.background = Some(Background::Color(Color::from_rgb(0.941, 0.502, 0.502)));
|
||||
/// },
|
||||
/// }
|
||||
///
|
||||
/// style
|
||||
/// }
|
||||
/// }
|
||||
/// ```
|
||||
///
|
||||
/// Although, in order to use [`Button::style`]
|
||||
/// with `MyTheme`, [`Catalog::Class`] must implement
|
||||
/// `From<StyleFn<'_, MyTheme>>`.
|
||||
pub trait Catalog {
|
||||
/// The item class of the [`Catalog`].
|
||||
type Class<'a>;
|
||||
|
||||
/// The default class produced by the [`Catalog`].
|
||||
fn default<'a>() -> Self::Class<'a>;
|
||||
|
||||
/// The [`Style`] of a class with the given status.
|
||||
fn style(&self, class: &Self::Class<'_>, status: Status) -> Style;
|
||||
}
|
||||
|
||||
/// A styling function for a [`Button`].
|
||||
pub type StyleFn<'a, Theme> = Box<dyn Fn(&Theme, Status) -> Style + 'a>;
|
||||
|
||||
impl Catalog for Theme {
|
||||
type Class<'a> = StyleFn<'a, Self>;
|
||||
|
||||
fn default<'a>() -> Self::Class<'a> {
|
||||
Box::new(primary)
|
||||
}
|
||||
|
||||
fn style(&self, class: &Self::Class<'_>, status: Status) -> Style {
|
||||
class(self, status)
|
||||
}
|
||||
}
|
||||
|
||||
/// A primary button; denoting a main action.
|
||||
pub fn primary(theme: &Theme, status: Status) -> Style {
|
||||
let palette = theme.extended_palette();
|
||||
let base = styled(palette.primary.base);
|
||||
|
||||
match status {
|
||||
Status::Active | Status::Pressed => base,
|
||||
Status::Hovered => Style {
|
||||
background: Some(Background::Color(palette.primary.strong.color)),
|
||||
..base
|
||||
},
|
||||
Status::Disabled => disabled(base),
|
||||
}
|
||||
}
|
||||
|
||||
/// A secondary button; denoting a complementary action.
|
||||
pub fn secondary(theme: &Theme, status: Status) -> Style {
|
||||
let palette = theme.extended_palette();
|
||||
let base = styled(palette.secondary.base);
|
||||
|
||||
match status {
|
||||
Status::Active | Status::Pressed => base,
|
||||
Status::Hovered => Style {
|
||||
background: Some(Background::Color(palette.secondary.strong.color)),
|
||||
..base
|
||||
},
|
||||
Status::Disabled => disabled(base),
|
||||
}
|
||||
}
|
||||
|
||||
/// A success button; denoting a good outcome.
|
||||
pub fn success(theme: &Theme, status: Status) -> Style {
|
||||
let palette = theme.extended_palette();
|
||||
let base = styled(palette.success.base);
|
||||
|
||||
match status {
|
||||
Status::Active | Status::Pressed => base,
|
||||
Status::Hovered => Style {
|
||||
background: Some(Background::Color(palette.success.strong.color)),
|
||||
..base
|
||||
},
|
||||
Status::Disabled => disabled(base),
|
||||
}
|
||||
}
|
||||
|
||||
/// A warning button; denoting a risky action.
|
||||
pub fn warning(theme: &Theme, status: Status) -> Style {
|
||||
let palette = theme.extended_palette();
|
||||
let base = styled(palette.warning.base);
|
||||
|
||||
match status {
|
||||
Status::Active | Status::Pressed => base,
|
||||
Status::Hovered => Style {
|
||||
background: Some(Background::Color(palette.warning.strong.color)),
|
||||
..base
|
||||
},
|
||||
Status::Disabled => disabled(base),
|
||||
}
|
||||
}
|
||||
|
||||
/// A danger button; denoting a destructive action.
|
||||
pub fn danger(theme: &Theme, status: Status) -> Style {
|
||||
let palette = theme.extended_palette();
|
||||
let base = styled(palette.danger.base);
|
||||
|
||||
match status {
|
||||
Status::Active | Status::Pressed => base,
|
||||
Status::Hovered => Style {
|
||||
background: Some(Background::Color(palette.danger.strong.color)),
|
||||
..base
|
||||
},
|
||||
Status::Disabled => disabled(base),
|
||||
}
|
||||
}
|
||||
|
||||
/// A text button; useful for links.
|
||||
pub fn text(theme: &Theme, status: Status) -> Style {
|
||||
let palette = theme.extended_palette();
|
||||
|
||||
let base = Style {
|
||||
text_color: palette.background.base.text,
|
||||
..Style::default()
|
||||
};
|
||||
|
||||
match status {
|
||||
Status::Active | Status::Pressed => base,
|
||||
Status::Hovered => Style {
|
||||
text_color: palette.background.base.text.scale_alpha(0.8),
|
||||
..base
|
||||
},
|
||||
Status::Disabled => disabled(base),
|
||||
}
|
||||
}
|
||||
|
||||
/// A button using background shades.
|
||||
pub fn background(theme: &Theme, status: Status) -> Style {
|
||||
let palette = theme.extended_palette();
|
||||
let base = styled(palette.background.base);
|
||||
|
||||
match status {
|
||||
Status::Active => base,
|
||||
Status::Pressed => Style {
|
||||
background: Some(Background::Color(
|
||||
palette.background.strong.color,
|
||||
)),
|
||||
..base
|
||||
},
|
||||
Status::Hovered => Style {
|
||||
background: Some(Background::Color(palette.background.weak.color)),
|
||||
..base
|
||||
},
|
||||
Status::Disabled => disabled(base),
|
||||
}
|
||||
}
|
||||
|
||||
/// A subtle button using weak background shades.
|
||||
pub fn subtle(theme: &Theme, status: Status) -> Style {
|
||||
let palette = theme.extended_palette();
|
||||
let base = styled(palette.background.weakest);
|
||||
|
||||
match status {
|
||||
Status::Active => base,
|
||||
Status::Pressed => Style {
|
||||
background: Some(Background::Color(
|
||||
palette.background.strong.color,
|
||||
)),
|
||||
..base
|
||||
},
|
||||
Status::Hovered => Style {
|
||||
background: Some(Background::Color(
|
||||
palette.background.weaker.color,
|
||||
)),
|
||||
..base
|
||||
},
|
||||
Status::Disabled => disabled(base),
|
||||
}
|
||||
}
|
||||
|
||||
fn styled(pair: palette::Pair) -> Style {
|
||||
Style {
|
||||
background: Some(Background::Color(pair.color)),
|
||||
text_color: pair.text,
|
||||
border: border::rounded(2),
|
||||
..Style::default()
|
||||
}
|
||||
}
|
||||
|
||||
fn disabled(style: Style) -> Style {
|
||||
Style {
|
||||
background: style
|
||||
.background
|
||||
.map(|background| background.scale_alpha(0.5)),
|
||||
text_color: style.text_color.scale_alpha(0.5),
|
||||
..style
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user