516 lines
16 KiB
Rust
516 lines
16 KiB
Rust
// Copyright 2023 System76 <info@system76.com>
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// Copyright 2019 Héctor Ramón, Iced contributors
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// SPDX-License-Identifier: MPL-2.0 AND MIT
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mod appearance;
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pub use appearance::{Appearance, StyleSheet};
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use std::ffi::OsStr;
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use crate::widget::{icon, Container};
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use iced_core::event::{self, Event};
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use iced_core::layout::{self, Layout};
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use iced_core::text::{self, Text};
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use iced_core::widget::Tree;
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use iced_core::{
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alignment, mouse, overlay, renderer, svg, touch, Clipboard, Color, Element, Length, Padding,
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Pixels, Point, Rectangle, Renderer, Shell, Size, Vector, Widget,
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};
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use iced_widget::scrollable::Scrollable;
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/// A list of selectable options.
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#[must_use]
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pub struct Menu<'a, S, Message>
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where
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S: AsRef<str>,
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{
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state: &'a mut State,
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options: &'a [S],
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hovered_option: &'a mut Option<usize>,
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selected_option: Option<usize>,
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on_selected: Box<dyn FnMut(usize) -> Message + 'a>,
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on_option_hovered: Option<&'a dyn Fn(usize) -> Message>,
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width: f32,
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padding: Padding,
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text_size: Option<f32>,
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text_line_height: text::LineHeight,
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style: (),
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}
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impl<'a, S: AsRef<str>, Message: 'a> Menu<'a, S, Message> {
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/// Creates a new [`Menu`] with the given [`State`], a list of options, and
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/// the message to produced when an option is selected.
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pub fn new(
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state: &'a mut State,
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options: &'a [S],
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hovered_option: &'a mut Option<usize>,
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selected_option: Option<usize>,
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on_selected: impl FnMut(usize) -> Message + 'a,
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on_option_hovered: Option<&'a dyn Fn(usize) -> Message>,
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) -> Self {
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Menu {
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state,
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options,
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hovered_option,
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selected_option,
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on_selected: Box::new(on_selected),
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on_option_hovered,
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width: 0.0,
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padding: Padding::ZERO,
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text_size: None,
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text_line_height: text::LineHeight::default(),
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style: Default::default(),
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}
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}
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/// Sets the width of the [`Menu`].
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pub fn width(mut self, width: f32) -> Self {
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self.width = width;
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self
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}
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/// Sets the [`Padding`] of the [`Menu`].
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pub fn padding<P: Into<Padding>>(mut self, padding: P) -> Self {
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self.padding = padding.into();
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self
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}
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/// Sets the text size of the [`Menu`].
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pub fn text_size(mut self, text_size: impl Into<Pixels>) -> Self {
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self.text_size = Some(text_size.into().0);
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self
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}
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/// Sets the text [`LineHeight`] of the [`Menu`].
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pub fn text_line_height(mut self, line_height: impl Into<text::LineHeight>) -> Self {
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self.text_line_height = line_height.into();
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self
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}
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/// Turns the [`Menu`] into an overlay [`Element`] at the given target
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/// position.
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///
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/// The `target_height` will be used to display the menu either on top
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/// of the target or under it, depending on the screen position and the
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/// dimensions of the [`Menu`].
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#[must_use]
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pub fn overlay(
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self,
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position: Point,
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target_height: f32,
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) -> overlay::Element<'a, Message, crate::Renderer> {
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overlay::Element::new(position, Box::new(Overlay::new(self, target_height)))
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}
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}
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/// The local state of a [`Menu`].
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#[must_use]
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#[derive(Debug)]
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pub struct State {
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tree: Tree,
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}
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impl State {
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/// Creates a new [`State`] for a [`Menu`].
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pub fn new() -> Self {
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Self {
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tree: Tree::empty(),
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}
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}
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}
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impl Default for State {
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fn default() -> Self {
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Self::new()
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}
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}
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struct Overlay<'a, Message> {
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state: &'a mut Tree,
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container: Container<'a, Message, crate::Renderer>,
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width: f32,
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target_height: f32,
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style: (),
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}
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impl<'a, Message: 'a> Overlay<'a, Message> {
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pub fn new<S: AsRef<str>>(menu: Menu<'a, S, Message>, target_height: f32) -> Self {
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let Menu {
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state,
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options,
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hovered_option,
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selected_option,
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on_selected,
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on_option_hovered,
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width,
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padding,
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text_size,
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text_line_height,
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style,
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} = menu;
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let selected_icon = icon::from_name("object-select-symbolic").size(16).handle();
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let mut container = Container::new(Scrollable::new(List {
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options,
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hovered_option,
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selected_option,
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on_selected,
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on_option_hovered,
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text_size,
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text_line_height,
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padding,
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selected_icon: match selected_icon.data {
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icon::Data::Name(named) => named
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.path()
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.filter(|path| path.extension().is_some_and(|ext| ext == OsStr::new("svg")))
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.map(iced_core::svg::Handle::from_path),
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icon::Data::Svg(handle) => Some(handle),
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icon::Data::Image(_) => None,
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},
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}));
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container = container
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.padding(padding)
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.style(crate::style::Container::Dropdown);
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state.tree.diff(&mut container as &mut dyn Widget<_, _>);
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Self {
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state: &mut state.tree,
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container,
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width,
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target_height,
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style,
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}
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}
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}
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impl<'a, Message> iced_core::Overlay<Message, crate::Renderer> for Overlay<'a, Message> {
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fn layout(&self, renderer: &crate::Renderer, bounds: Size, position: Point) -> layout::Node {
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let space_below = bounds.height - (position.y + self.target_height);
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let space_above = position.y;
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let limits = layout::Limits::new(
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Size::ZERO,
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Size::new(
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bounds.width - position.x,
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if space_below > space_above {
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space_below
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} else {
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space_above
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},
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),
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)
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.width(self.width);
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let mut node = self.container.layout(renderer, &limits);
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node.move_to(if space_below > space_above {
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position + Vector::new(0.0, self.target_height)
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} else {
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position - Vector::new(0.0, node.size().height)
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});
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node
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}
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fn on_event(
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&mut self,
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event: Event,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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renderer: &crate::Renderer,
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clipboard: &mut dyn Clipboard,
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shell: &mut Shell<'_, Message>,
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) -> event::Status {
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let bounds = layout.bounds();
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self.container.on_event(
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self.state, event, layout, cursor, renderer, clipboard, shell, &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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layout: Layout<'_>,
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cursor: mouse::Cursor,
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viewport: &Rectangle,
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renderer: &crate::Renderer,
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) -> mouse::Interaction {
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self.container
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.mouse_interaction(self.state, layout, cursor, viewport, renderer)
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}
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fn draw(
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&self,
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renderer: &mut crate::Renderer,
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theme: &crate::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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) {
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let appearance = theme.appearance(&self.style);
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let bounds = layout.bounds();
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renderer.fill_quad(
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renderer::Quad {
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bounds,
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border_color: appearance.border_color,
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border_width: appearance.border_width,
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border_radius: appearance.border_radius,
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},
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appearance.background,
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);
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self.container
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.draw(self.state, renderer, theme, style, layout, cursor, &bounds);
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}
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}
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struct List<'a, S: AsRef<str>, Message> {
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options: &'a [S],
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hovered_option: &'a mut Option<usize>,
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selected_option: Option<usize>,
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on_selected: Box<dyn FnMut(usize) -> Message + 'a>,
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on_option_hovered: Option<&'a dyn Fn(usize) -> Message>,
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padding: Padding,
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text_size: Option<f32>,
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text_line_height: text::LineHeight,
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selected_icon: Option<svg::Handle>,
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}
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impl<'a, S: AsRef<str>, Message> Widget<Message, crate::Renderer> for List<'a, S, Message> {
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fn width(&self) -> Length {
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Length::Fill
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}
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fn height(&self) -> Length {
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Length::Shrink
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}
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fn layout(&self, renderer: &crate::Renderer, limits: &layout::Limits) -> layout::Node {
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use std::f32;
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let limits = limits.width(Length::Fill).height(Length::Shrink);
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let text_size = self
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.text_size
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.unwrap_or_else(|| text::Renderer::default_size(renderer));
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let text_line_height = self.text_line_height.to_absolute(Pixels(text_size));
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let size = {
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let intrinsic = Size::new(
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0.0,
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(f32::from(text_line_height) + self.padding.vertical()) * self.options.len() as f32,
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);
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limits.resolve(intrinsic)
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};
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layout::Node::new(size)
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}
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fn on_event(
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&mut self,
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_state: &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: &crate::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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match event {
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Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
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if cursor.is_over(layout.bounds()) {
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if let Some(index) = *self.hovered_option {
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shell.publish((self.on_selected)(index));
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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::CursorMoved { .. }) => {
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if let Some(cursor_position) = cursor.position_in(layout.bounds()) {
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let text_size = self
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.text_size
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.unwrap_or_else(|| text::Renderer::default_size(renderer));
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let option_height =
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f32::from(self.text_line_height.to_absolute(Pixels(text_size)))
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+ self.padding.vertical();
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let new_hovered_option = (cursor_position.y / option_height) as usize;
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if let Some(on_option_hovered) = self.on_option_hovered {
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if *self.hovered_option != Some(new_hovered_option) {
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shell.publish(on_option_hovered(new_hovered_option));
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}
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}
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*self.hovered_option = Some(new_hovered_option);
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}
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}
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Event::Touch(touch::Event::FingerPressed { .. }) => {
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if let Some(cursor_position) = cursor.position_in(layout.bounds()) {
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let text_size = self
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.text_size
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.unwrap_or_else(|| text::Renderer::default_size(renderer));
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let option_height =
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f32::from(self.text_line_height.to_absolute(Pixels(text_size)))
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+ self.padding.vertical();
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*self.hovered_option = Some((cursor_position.y / option_height) as usize);
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if let Some(index) = *self.hovered_option {
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shell.publish((self.on_selected)(index));
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return event::Status::Captured;
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}
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}
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}
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_ => {}
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}
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event::Status::Ignored
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}
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fn mouse_interaction(
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&self,
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_state: &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: &crate::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 {
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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 draw(
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&self,
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_state: &Tree,
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renderer: &mut crate::Renderer,
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theme: &crate::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 appearance = theme.appearance(&());
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let bounds = layout.bounds();
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let text_size = self
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.text_size
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.unwrap_or_else(|| text::Renderer::default_size(renderer));
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let option_height = f32::from(self.text_line_height.to_absolute(Pixels(text_size)))
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+ self.padding.vertical();
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let offset = viewport.y - bounds.y;
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let start = (offset / option_height) as usize;
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let end = ((offset + viewport.height) / option_height).ceil() as usize;
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let visible_options = &self.options[start..end.min(self.options.len())];
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for (i, option) in visible_options.iter().enumerate() {
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let i = start + i;
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let bounds = Rectangle {
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x: bounds.x,
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y: option_height.mul_add(i as f32, bounds.y),
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width: bounds.width,
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height: option_height,
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};
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let (color, font) = if self.selected_option == Some(i) {
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let item_x = bounds.x + appearance.border_width;
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let item_width = appearance.border_width.mul_add(-2.0, bounds.width);
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renderer.fill_quad(
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renderer::Quad {
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bounds: Rectangle {
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x: item_x,
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width: item_width,
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..bounds
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},
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border_color: Color::TRANSPARENT,
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border_width: 0.0,
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border_radius: appearance.border_radius,
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},
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appearance.selected_background,
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);
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if let Some(handle) = self.selected_icon.clone() {
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svg::Renderer::draw(
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renderer,
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handle,
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Some(appearance.selected_text_color),
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Rectangle {
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x: item_x + item_width - 16.0 - 8.0,
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y: bounds.y + (bounds.height / 2.0 - 8.0),
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width: 16.0,
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height: 16.0,
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},
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);
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}
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(appearance.selected_text_color, crate::font::FONT_SEMIBOLD)
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} else if *self.hovered_option == Some(i) {
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let item_x = bounds.x + appearance.border_width;
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let item_width = appearance.border_width.mul_add(-2.0, bounds.width);
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renderer.fill_quad(
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renderer::Quad {
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bounds: Rectangle {
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x: item_x,
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width: item_width,
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..bounds
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},
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border_color: Color::TRANSPARENT,
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border_width: 0.0,
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border_radius: appearance.border_radius,
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},
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appearance.hovered_background,
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);
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(appearance.hovered_text_color, crate::font::FONT)
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} else {
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(appearance.text_color, crate::font::FONT)
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};
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text::Renderer::fill_text(
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renderer,
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Text {
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content: option.as_ref(),
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bounds: Rectangle {
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x: bounds.x + self.padding.left,
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y: bounds.center_y(),
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width: f32::INFINITY,
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..bounds
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},
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size: text_size,
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line_height: self.text_line_height,
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font,
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color,
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horizontal_alignment: alignment::Horizontal::Left,
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vertical_alignment: alignment::Vertical::Center,
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shaping: text::Shaping::Advanced,
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},
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);
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}
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}
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}
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impl<'a, S: AsRef<str>, Message: 'a> From<List<'a, S, Message>>
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for Element<'a, Message, crate::Renderer>
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{
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fn from(list: List<'a, S, Message>) -> Self {
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Element::new(list)
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}
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}
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