use super::Model;
pub use crate::widget::dropdown::menu::{Appearance, StyleSheet};
use crate::widget::Container;
use iced_core::event::{self, Event};
use iced_core::layout::{self, Layout};
use iced_core::text::{self, Text};
use iced_core::widget::Tree;
use iced_core::{
alignment, mouse, overlay, renderer, svg, touch, Border, Clipboard, Element, Length, Padding,
Pixels, Point, Rectangle, Renderer, Shadow, Shell, Size, Vector, Widget,
};
use iced_widget::scrollable::Scrollable;
#[must_use]
pub struct Menu<'a, S, Item, Message>
where
S: AsRef<str>,
{
state: &'a mut State,
options: &'a Model<S, Item>,
hovered_option: &'a mut Option<Item>,
selected_option: Option<&'a Item>,
on_selected: Box<dyn FnMut(Item) -> Message + 'a>,
on_option_hovered: Option<&'a dyn Fn(Item) -> Message>,
width: f32,
padding: Padding,
text_size: Option<f32>,
text_line_height: text::LineHeight,
style: (),
}
impl<'a, S, Item, Message: 'a> Menu<'a, S, Item, Message>
where
S: AsRef<str>,
Item: Clone + PartialEq,
{
pub(super) fn new(
state: &'a mut State,
options: &'a Model<S, Item>,
hovered_option: &'a mut Option<Item>,
selected_option: Option<&'a Item>,
on_selected: impl FnMut(Item) -> Message + 'a,
on_option_hovered: Option<&'a dyn Fn(Item) -> Message>,
) -> Self {
Menu {
state,
options,
hovered_option,
selected_option,
on_selected: Box::new(on_selected),
on_option_hovered,
width: 0.0,
padding: Padding::ZERO,
text_size: None,
text_line_height: text::LineHeight::Absolute(Pixels::from(16.0)),
style: Default::default(),
}
}
pub fn width(mut self, width: f32) -> Self {
self.width = width;
self
}
pub fn padding<P: Into<Padding>>(mut self, padding: P) -> Self {
self.padding = padding.into();
self
}
pub fn text_size(mut self, text_size: impl Into<Pixels>) -> Self {
self.text_size = Some(text_size.into().0);
self
}
pub fn text_line_height(mut self, line_height: impl Into<text::LineHeight>) -> Self {
self.text_line_height = line_height.into();
self
}
#[must_use]
pub fn overlay(
self,
position: Point,
target_height: f32,
) -> overlay::Element<'a, Message, crate::Theme, crate::Renderer> {
overlay::Element::new(Box::new(Overlay::new(self, target_height, position)))
}
}
#[must_use]
#[derive(Debug)]
pub(super) struct State {
tree: Tree,
}
impl State {
pub fn new() -> Self {
Self {
tree: Tree::empty(),
}
}
}
impl Default for State {
fn default() -> Self {
Self::new()
}
}
struct Overlay<'a, Message> {
state: &'a mut Tree,
container: Container<'a, Message, crate::Theme, crate::Renderer>,
width: f32,
target_height: f32,
style: (),
position: Point,
}
impl<'a, Message: 'a> Overlay<'a, Message> {
pub fn new<S: AsRef<str>, Item: Clone + PartialEq>(
menu: Menu<'a, S, Item, Message>,
target_height: f32,
position: Point,
) -> Self {
let Menu {
state,
options,
hovered_option,
selected_option,
on_selected,
on_option_hovered,
width,
padding,
text_size,
text_line_height,
style,
} = menu;
let mut container = Container::new(Scrollable::new(InnerList {
options,
hovered_option,
selected_option,
on_selected,
on_option_hovered,
padding,
text_size,
text_line_height,
}));
container = container
.padding(padding)
.class(crate::style::Container::Dropdown);
state.tree.diff(&mut container as &mut dyn Widget<_, _, _>);
Self {
state: &mut state.tree,
container,
width,
target_height,
style,
position,
}
}
}
impl<'a, Message> iced_core::Overlay<Message, crate::Theme, crate::Renderer>
for Overlay<'a, Message>
{
fn layout(&mut self, renderer: &crate::Renderer, bounds: Size) -> layout::Node {
let position = self.position;
let space_below = bounds.height - (position.y + self.target_height);
let space_above = position.y;
let limits = layout::Limits::new(
Size::ZERO,
Size::new(
bounds.width - position.x,
if space_below > space_above {
space_below
} else {
space_above
},
),
)
.width(self.width);
let mut node = self.container.layout(self.state, renderer, &limits);
node = node.clone().move_to(if space_below > space_above {
position + Vector::new(0.0, self.target_height)
} else {
position - Vector::new(0.0, node.size().height)
});
node
}
fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor: mouse::Cursor,
renderer: &crate::Renderer,
clipboard: &mut dyn Clipboard,
shell: &mut Shell<'_, Message>,
) -> event::Status {
let bounds = layout.bounds();
self.container.on_event(
self.state, event, layout, cursor, renderer, clipboard, shell, &bounds,
)
}
fn mouse_interaction(
&self,
layout: Layout<'_>,
cursor: mouse::Cursor,
viewport: &Rectangle,
renderer: &crate::Renderer,
) -> mouse::Interaction {
self.container
.mouse_interaction(self.state, layout, cursor, viewport, renderer)
}
fn draw(
&self,
renderer: &mut crate::Renderer,
theme: &crate::Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
) {
let appearance = theme.appearance(&self.style);
let bounds = layout.bounds();
renderer.fill_quad(
renderer::Quad {
bounds,
border: Border {
width: appearance.border_width,
color: appearance.border_color,
radius: appearance.border_radius,
},
shadow: Shadow::default(),
},
appearance.background,
);
self.container
.draw(self.state, renderer, theme, style, layout, cursor, &bounds);
}
}
struct InnerList<'a, S, Item, Message> {
options: &'a Model<S, Item>,
hovered_option: &'a mut Option<Item>,
selected_option: Option<&'a Item>,
on_selected: Box<dyn FnMut(Item) -> Message + 'a>,
on_option_hovered: Option<&'a dyn Fn(Item) -> Message>,
padding: Padding,
text_size: Option<f32>,
text_line_height: text::LineHeight,
}
impl<'a, S, Item, Message> Widget<Message, crate::Theme, crate::Renderer>
for InnerList<'a, S, Item, Message>
where
S: AsRef<str>,
Item: Clone + PartialEq,
{
fn size(&self) -> Size<Length> {
Size::new(Length::Fill, Length::Shrink)
}
fn layout(
&self,
_tree: &mut Tree,
renderer: &crate::Renderer,
limits: &layout::Limits,
) -> layout::Node {
use std::f32;
let limits = limits.width(Length::Fill).height(Length::Shrink);
let text_size = self
.text_size
.unwrap_or_else(|| text::Renderer::default_size(renderer).0);
let text_line_height = self.text_line_height.to_absolute(Pixels(text_size));
let lists = self.options.lists.len();
let (descriptions, options) = self.options.lists.iter().fold((0, 0), |acc, l| {
(
acc.0 + i32::from(l.description.is_some()),
acc.1 + l.options.len(),
)
});
let vertical_padding = self.padding.vertical();
let text_line_height = f32::from(text_line_height);
let size = {
#[allow(clippy::cast_precision_loss)]
let intrinsic = Size::new(0.0, {
let text = vertical_padding + text_line_height;
let separators = ((vertical_padding / 2.0) + 1.0) * (lists - 1) as f32;
let descriptions = (text + 4.0) * descriptions as f32;
let options = text * options as f32;
separators + descriptions + options
});
limits.resolve(Length::Fill, Length::Shrink, intrinsic)
};
layout::Node::new(size)
}
fn on_event(
&mut self,
_state: &mut Tree,
event: Event,
layout: Layout<'_>,
cursor: mouse::Cursor,
renderer: &crate::Renderer,
_clipboard: &mut dyn Clipboard,
shell: &mut Shell<'_, Message>,
_viewport: &Rectangle,
) -> event::Status {
let bounds = layout.bounds();
match event {
Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
if cursor.is_over(bounds) {
if let Some(item) = self.hovered_option.as_ref() {
shell.publish((self.on_selected)(item.clone()));
return event::Status::Captured;
}
}
}
Event::Mouse(mouse::Event::CursorMoved { .. }) => {
if let Some(cursor_position) = cursor.position_in(bounds) {
let text_size = self
.text_size
.unwrap_or_else(|| text::Renderer::default_size(renderer).0);
let text_line_height =
f32::from(self.text_line_height.to_absolute(Pixels(text_size)));
let heights = self
.options
.element_heights(self.padding.vertical(), text_line_height);
let mut current_offset = 0.0;
let previous_hover_option = self.hovered_option.take();
for (element, elem_height) in self.options.elements().zip(heights) {
let bounds = Rectangle {
x: 0.0,
y: 0.0 + current_offset,
width: bounds.width,
height: elem_height,
};
if bounds.contains(cursor_position) {
*self.hovered_option = if let OptionElement::Option((_, item)) = element
{
if previous_hover_option.as_ref() == Some(item) {
previous_hover_option
} else {
if let Some(on_option_hovered) = self.on_option_hovered {
shell.publish(on_option_hovered(item.clone()));
}
Some(item.clone())
}
} else {
None
};
break;
}
current_offset += elem_height;
}
}
}
Event::Touch(touch::Event::FingerPressed { .. }) => {
if let Some(cursor_position) = cursor.position_in(bounds) {
let text_size = self
.text_size
.unwrap_or_else(|| text::Renderer::default_size(renderer).0);
let text_line_height =
f32::from(self.text_line_height.to_absolute(Pixels(text_size)));
let heights = self
.options
.element_heights(self.padding.vertical(), text_line_height);
let mut current_offset = 0.0;
let previous_hover_option = self.hovered_option.take();
for (element, elem_height) in self.options.elements().zip(heights) {
let bounds = Rectangle {
x: 0.0,
y: 0.0 + current_offset,
width: bounds.width,
height: elem_height,
};
if bounds.contains(cursor_position) {
*self.hovered_option = if let OptionElement::Option((_, item)) = element
{
if previous_hover_option.as_ref() == Some(item) {
previous_hover_option
} else {
Some(item.clone())
}
} else {
None
};
if let Some(item) = self.hovered_option {
shell.publish((self.on_selected)(item.clone()));
}
break;
}
current_offset += elem_height;
}
}
}
_ => {}
}
event::Status::Ignored
}
fn mouse_interaction(
&self,
_state: &Tree,
layout: Layout<'_>,
cursor: mouse::Cursor,
_viewport: &Rectangle,
_renderer: &crate::Renderer,
) -> mouse::Interaction {
let is_mouse_over = cursor.is_over(layout.bounds());
if is_mouse_over {
mouse::Interaction::Pointer
} else {
mouse::Interaction::default()
}
}
#[allow(clippy::too_many_lines)]
fn draw(
&self,
_state: &Tree,
renderer: &mut crate::Renderer,
theme: &crate::Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
viewport: &Rectangle,
) {
let appearance = theme.appearance(&());
let bounds = layout.bounds();
let text_size = self
.text_size
.unwrap_or_else(|| text::Renderer::default_size(renderer).0);
let offset = viewport.y - bounds.y;
let text_line_height = f32::from(self.text_line_height.to_absolute(Pixels(text_size)));
let visible_options = self.options.visible_options(
self.padding.vertical(),
text_line_height,
offset,
viewport.height,
);
let mut current_offset = 0.0;
for (elem, elem_height) in visible_options {
let mut bounds = Rectangle {
x: bounds.x,
y: bounds.y + current_offset,
width: bounds.width,
height: elem_height,
};
current_offset += elem_height;
match elem {
OptionElement::Option((option, item)) => {
let (color, font) = if self.selected_option.as_ref() == Some(&item) {
let item_x = bounds.x + appearance.border_width;
let item_width = bounds.width - appearance.border_width * 2.0;
bounds = Rectangle {
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.selected_background,
);
let svg_handle =
svg::Svg::new(crate::widget::common::object_select().clone())
.color(appearance.selected_text_color)
.border_radius(appearance.border_radius);
svg::Renderer::draw_svg(
renderer,
svg_handle,
Rectangle {
x: item_x + item_width - 16.0 - 8.0,
y: bounds.y + (bounds.height / 2.0 - 8.0),
width: 16.0,
height: 16.0,
},
);
(appearance.selected_text_color, crate::font::semibold())
} else if self.hovered_option.as_ref() == Some(item) {
let item_x = bounds.x + appearance.border_width;
let item_width = bounds.width - appearance.border_width * 2.0;
bounds = Rectangle {
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,
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(),
},
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(),
},
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>> + '_ {
let iterator = 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))
});
iterator
}
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
})
}
}