724 lines
24 KiB
Rust
724 lines
24 KiB
Rust
use super::Model;
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pub use crate::widget::dropdown::menu::{Appearance, StyleSheet};
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use crate::widget::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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Border, Clipboard, Element, Length, Padding, Pixels, Point, Rectangle, Renderer, Shadow, Shell,
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Size, Vector, Widget, alignment, mouse, overlay, renderer, svg, touch,
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};
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use iced_widget::scrollable::Scrollable;
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/// A dropdown menu with multiple lists.
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#[must_use]
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pub struct Menu<'a, S, Item, 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 Model<S, Item>,
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hovered_option: &'a mut Option<Item>,
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selected_option: Option<&'a Item>,
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on_selected: Box<dyn FnMut(Item) -> Message + 'a>,
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on_option_hovered: Option<&'a dyn Fn(Item) -> 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, Item, Message: 'a> Menu<'a, S, Item, Message>
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where
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S: AsRef<str>,
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Item: Clone + PartialEq,
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{
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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(super) fn new(
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state: &'a mut State,
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options: &'a Model<S, Item>,
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hovered_option: &'a mut Option<Item>,
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selected_option: Option<&'a Item>,
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on_selected: impl FnMut(Item) -> Message + 'a,
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on_option_hovered: Option<&'a dyn Fn(Item) -> 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::Absolute(Pixels::from(16.0)),
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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::Theme, crate::Renderer> {
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overlay::Element::new(Box::new(Overlay::new(self, target_height, position)))
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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(super) 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::Theme, crate::Renderer>,
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width: f32,
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target_height: f32,
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style: (),
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position: Point,
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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>, Item: Clone + PartialEq>(
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menu: Menu<'a, S, Item, Message>,
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target_height: f32,
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position: Point,
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) -> 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 mut container = Container::new(Scrollable::new(
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Container::new(InnerList {
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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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padding,
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text_size,
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text_line_height,
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})
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.padding(padding),
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))
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.class(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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position,
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}
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}
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}
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impl<Message> iced_core::Overlay<Message, crate::Theme, crate::Renderer> for Overlay<'_, Message> {
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fn layout(&mut self, renderer: &crate::Renderer, bounds: Size) -> layout::Node {
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let position = self.position;
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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 node = self.container.layout(self.state, renderer, &limits);
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let node_size = node.size();
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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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}
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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: Border {
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width: appearance.border_width,
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color: appearance.border_color,
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radius: appearance.border_radius,
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},
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shadow: Shadow::default(),
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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 InnerList<'a, S, Item, Message> {
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options: &'a Model<S, Item>,
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hovered_option: &'a mut Option<Item>,
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selected_option: Option<&'a Item>,
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on_selected: Box<dyn FnMut(Item) -> Message + 'a>,
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on_option_hovered: Option<&'a dyn Fn(Item) -> 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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}
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impl<S, Item, Message> Widget<Message, crate::Theme, crate::Renderer>
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for InnerList<'_, S, Item, Message>
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where
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S: AsRef<str>,
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Item: Clone + PartialEq,
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{
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fn size(&self) -> Size<Length> {
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Size::new(Length::Fill, Length::Shrink)
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}
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fn layout(
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&self,
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_tree: &mut Tree,
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renderer: &crate::Renderer,
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limits: &layout::Limits,
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) -> 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).0);
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let text_line_height = self.text_line_height.to_absolute(Pixels(text_size));
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let lists = self.options.lists.len();
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let (descriptions, options) = self.options.lists.iter().fold((0, 0), |acc, l| {
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(
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acc.0 + i32::from(l.description.is_some()),
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acc.1 + l.options.len(),
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)
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});
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let vertical_padding = self.padding.vertical();
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let text_line_height = f32::from(text_line_height);
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let size = {
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#[allow(clippy::cast_precision_loss)]
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let intrinsic = Size::new(0.0, {
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let text = vertical_padding + text_line_height;
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let separators = ((vertical_padding / 2.0) + 1.0) * (lists - 1) as f32;
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let descriptions = (text + 4.0) * descriptions as f32;
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let options = text * options as f32;
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separators + descriptions + options
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});
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limits.resolve(Length::Fill, Length::Shrink, 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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let bounds = layout.bounds();
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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(bounds) {
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if let Some(item) = self.hovered_option.as_ref() {
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shell.publish((self.on_selected)(item.clone()));
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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(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).0);
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let text_line_height =
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f32::from(self.text_line_height.to_absolute(Pixels(text_size)));
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let heights = self
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.options
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.element_heights(self.padding.vertical(), text_line_height);
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let mut current_offset = 0.0;
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let previous_hover_option = self.hovered_option.take();
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for (element, elem_height) in self.options.elements().zip(heights) {
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let bounds = Rectangle {
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x: 0.0,
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y: 0.0 + current_offset,
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width: bounds.width,
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height: elem_height,
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};
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if bounds.contains(cursor_position) {
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*self.hovered_option = if let OptionElement::Option((_, item)) = element
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{
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if previous_hover_option.as_ref() == Some(item) {
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previous_hover_option
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} else {
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if let Some(on_option_hovered) = self.on_option_hovered {
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shell.publish(on_option_hovered(item.clone()));
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}
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Some(item.clone())
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}
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} else {
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None
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};
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break;
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}
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current_offset += elem_height;
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}
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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(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).0);
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let text_line_height =
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f32::from(self.text_line_height.to_absolute(Pixels(text_size)));
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let heights = self
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.options
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.element_heights(self.padding.vertical(), text_line_height);
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let mut current_offset = 0.0;
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let previous_hover_option = self.hovered_option.take();
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for (element, elem_height) in self.options.elements().zip(heights) {
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let bounds = Rectangle {
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x: 0.0,
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y: 0.0 + current_offset,
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width: bounds.width,
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height: elem_height,
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};
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if bounds.contains(cursor_position) {
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*self.hovered_option = if let OptionElement::Option((_, item)) = element
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{
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if previous_hover_option.as_ref() == Some(item) {
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previous_hover_option
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} else {
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Some(item.clone())
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}
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} else {
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None
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};
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if let Some(item) = self.hovered_option {
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shell.publish((self.on_selected)(item.clone()));
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}
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break;
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}
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current_offset += elem_height;
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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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|
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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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|
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#[allow(clippy::too_many_lines)]
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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).0);
|
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let offset = viewport.y - bounds.y;
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let text_line_height = f32::from(self.text_line_height.to_absolute(Pixels(text_size)));
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let visible_options = self.options.visible_options(
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self.padding.vertical(),
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text_line_height,
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offset,
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viewport.height,
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);
|
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let mut current_offset = 0.0;
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|
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for (elem, elem_height) in visible_options {
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let mut bounds = Rectangle {
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x: bounds.x,
|
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y: bounds.y + current_offset,
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width: bounds.width,
|
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height: elem_height,
|
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};
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|
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current_offset += elem_height;
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|
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match elem {
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OptionElement::Option((option, item)) => {
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let (color, font) = if self.selected_option.as_ref() == Some(&item) {
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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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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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|
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renderer.fill_quad(
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renderer::Quad {
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bounds,
|
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border: Border {
|
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radius: appearance.border_radius,
|
|
..Default::default()
|
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},
|
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shadow: Shadow::default(),
|
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},
|
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appearance.selected_background,
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);
|
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|
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let svg_handle =
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svg::Svg::new(crate::widget::common::object_select().clone())
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.color(appearance.selected_text_color)
|
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.border_radius(appearance.border_radius);
|
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svg::Renderer::draw_svg(
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renderer,
|
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svg_handle,
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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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(appearance.selected_text_color, crate::font::semibold())
|
|
} else if self.hovered_option.as_ref() == Some(item) {
|
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let item_x = bounds.x + appearance.border_width;
|
|
let item_width = appearance.border_width.mul_add(-2.0, bounds.width);
|
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|
|
bounds = Rectangle {
|
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x: item_x,
|
|
width: item_width,
|
|
..bounds
|
|
};
|
|
|
|
renderer.fill_quad(
|
|
renderer::Quad {
|
|
bounds,
|
|
border: Border {
|
|
radius: appearance.border_radius,
|
|
..Default::default()
|
|
},
|
|
shadow: Shadow::default(),
|
|
},
|
|
appearance.hovered_background,
|
|
);
|
|
|
|
(appearance.hovered_text_color, crate::font::default())
|
|
} else {
|
|
(appearance.text_color, crate::font::default())
|
|
};
|
|
|
|
let bounds = Rectangle {
|
|
x: bounds.x + self.padding.left,
|
|
// TODO: Figure out why it's offset by 8 pixels
|
|
y: bounds.y + self.padding.top + 8.0,
|
|
width: bounds.width,
|
|
height: elem_height,
|
|
};
|
|
text::Renderer::fill_text(
|
|
renderer,
|
|
Text {
|
|
content: option.as_ref().to_string(),
|
|
bounds: bounds.size(),
|
|
size: iced::Pixels(text_size),
|
|
line_height: self.text_line_height,
|
|
font,
|
|
horizontal_alignment: alignment::Horizontal::Left,
|
|
vertical_alignment: alignment::Vertical::Center,
|
|
shaping: text::Shaping::Advanced,
|
|
wrapping: text::Wrapping::default(),
|
|
ellipsize: text::Ellipsize::default(),
|
|
},
|
|
bounds.position(),
|
|
color,
|
|
*viewport,
|
|
);
|
|
}
|
|
|
|
OptionElement::Separator => {
|
|
let divider = crate::widget::divider::horizontal::light().height(1.0);
|
|
|
|
let layout_node = layout::Node::new(Size {
|
|
width: bounds.width,
|
|
height: 1.0,
|
|
})
|
|
.move_to(Point {
|
|
x: bounds.x,
|
|
y: bounds.y + (self.padding.vertical() / 2.0) - 4.0,
|
|
});
|
|
|
|
Widget::<Message, crate::Theme, crate::Renderer>::draw(
|
|
crate::Element::<Message>::from(divider).as_widget(),
|
|
&Tree::empty(),
|
|
renderer,
|
|
theme,
|
|
style,
|
|
Layout::new(&layout_node),
|
|
cursor,
|
|
viewport,
|
|
);
|
|
}
|
|
|
|
OptionElement::Description(description) => {
|
|
let bounds = Rectangle {
|
|
x: bounds.center_x(),
|
|
y: bounds.center_y(),
|
|
..bounds
|
|
};
|
|
text::Renderer::fill_text(
|
|
renderer,
|
|
Text {
|
|
content: description.as_ref().to_string(),
|
|
bounds: bounds.size(),
|
|
size: iced::Pixels(text_size),
|
|
line_height: text::LineHeight::Absolute(Pixels(text_line_height + 4.0)),
|
|
font: crate::font::default(),
|
|
horizontal_alignment: alignment::Horizontal::Center,
|
|
vertical_alignment: alignment::Vertical::Center,
|
|
shaping: text::Shaping::Advanced,
|
|
wrapping: text::Wrapping::default(),
|
|
ellipsize: text::Ellipsize::default(),
|
|
},
|
|
bounds.position(),
|
|
appearance.description_color,
|
|
*viewport,
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a, S, Item, Message: 'a> From<InnerList<'a, S, Item, Message>>
|
|
for Element<'a, Message, crate::Theme, crate::Renderer>
|
|
where
|
|
S: AsRef<str>,
|
|
Item: Clone + PartialEq,
|
|
{
|
|
fn from(list: InnerList<'a, S, Item, Message>) -> Self {
|
|
Element::new(list)
|
|
}
|
|
}
|
|
|
|
pub(super) enum OptionElement<'a, S, Item> {
|
|
Description(&'a S),
|
|
Option(&'a (S, Item)),
|
|
Separator,
|
|
}
|
|
|
|
impl<S, Message> Model<S, Message> {
|
|
pub(super) fn elements(&self) -> impl Iterator<Item = OptionElement<'_, S, Message>> + '_ {
|
|
self.lists.iter().flat_map(|list| {
|
|
let description = list
|
|
.description
|
|
.as_ref()
|
|
.into_iter()
|
|
.map(OptionElement::Description);
|
|
|
|
let options = list.options.iter().map(OptionElement::Option);
|
|
|
|
description
|
|
.chain(options)
|
|
.chain(std::iter::once(OptionElement::Separator))
|
|
})
|
|
}
|
|
|
|
fn element_heights(
|
|
&self,
|
|
vertical_padding: f32,
|
|
text_line_height: f32,
|
|
) -> impl Iterator<Item = f32> + '_ {
|
|
self.elements().map(move |element| match element {
|
|
OptionElement::Option(_) => vertical_padding + text_line_height,
|
|
OptionElement::Separator => (vertical_padding / 2.0) + 1.0,
|
|
OptionElement::Description(_) => vertical_padding + text_line_height + 4.0,
|
|
})
|
|
}
|
|
|
|
fn visible_options(
|
|
&self,
|
|
padding_vertical: f32,
|
|
text_line_height: f32,
|
|
offset: f32,
|
|
height: f32,
|
|
) -> impl Iterator<Item = (OptionElement<'_, S, Message>, f32)> + '_ {
|
|
let heights = self.element_heights(padding_vertical, text_line_height);
|
|
|
|
let mut current = 0.0;
|
|
self.elements()
|
|
.zip(heights)
|
|
.filter(move |(_, element_height)| {
|
|
let end = current + element_height;
|
|
let visible = current >= offset && end <= offset + height;
|
|
current = end;
|
|
visible
|
|
})
|
|
}
|
|
}
|