mod appearance;
pub use appearance::{Appearance, StyleSheet};
use crate::widget::{icon, 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, Message>
where
S: AsRef<str>,
{
state: &'a mut State,
options: &'a [S],
icons: &'a [icon::Handle],
hovered_option: &'a mut Option<usize>,
selected_option: Option<usize>,
on_selected: Box<dyn FnMut(usize) -> Message + 'a>,
on_option_hovered: Option<&'a dyn Fn(usize) -> Message>,
width: f32,
padding: Padding,
text_size: Option<f32>,
text_line_height: text::LineHeight,
style: (),
}
impl<'a, S: AsRef<str>, Message: 'a> Menu<'a, S, Message> {
pub fn new(
state: &'a mut State,
options: &'a [S],
icons: &'a [icon::Handle],
hovered_option: &'a mut Option<usize>,
selected_option: Option<usize>,
on_selected: impl FnMut(usize) -> Message + 'a,
on_option_hovered: Option<&'a dyn Fn(usize) -> Message>,
) -> Self {
Menu {
state,
options,
icons,
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::default(),
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 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>>(
menu: Menu<'a, S, Message>,
target_height: f32,
position: Point,
) -> Self {
let Menu {
state,
options,
icons,
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(
Container::new(List {
options,
icons,
hovered_option,
selected_option,
on_selected,
on_option_hovered,
text_size,
text_line_height,
padding,
})
.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 node = self.container.layout(self.state, renderer, &limits);
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)
})
}
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 List<'a, S: AsRef<str>, Message> {
options: &'a [S],
icons: &'a [icon::Handle],
hovered_option: &'a mut Option<usize>,
selected_option: Option<usize>,
on_selected: Box<dyn FnMut(usize) -> Message + 'a>,
on_option_hovered: Option<&'a dyn Fn(usize) -> Message>,
padding: Padding,
text_size: Option<f32>,
text_line_height: text::LineHeight,
}
impl<'a, S: AsRef<str>, Message> Widget<Message, crate::Theme, crate::Renderer>
for List<'a, S, Message>
{
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 size = {
let intrinsic = Size::new(
0.0,
(f32::from(text_line_height) + self.padding.vertical()) * self.options.len() as f32,
);
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 {
match event {
Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
if cursor.is_over(layout.bounds()) {
if let Some(index) = *self.hovered_option {
shell.publish((self.on_selected)(index));
return event::Status::Captured;
}
}
}
Event::Mouse(mouse::Event::CursorMoved { .. }) => {
if let Some(cursor_position) = cursor.position_in(layout.bounds()) {
let text_size = self
.text_size
.unwrap_or_else(|| text::Renderer::default_size(renderer).0);
let option_height =
f32::from(self.text_line_height.to_absolute(Pixels(text_size)))
+ self.padding.vertical();
let new_hovered_option = (cursor_position.y / option_height) as usize;
if let Some(on_option_hovered) = self.on_option_hovered {
if *self.hovered_option != Some(new_hovered_option) {
shell.publish(on_option_hovered(new_hovered_option));
}
}
*self.hovered_option = Some(new_hovered_option);
}
}
Event::Touch(touch::Event::FingerPressed { .. }) => {
if let Some(cursor_position) = cursor.position_in(layout.bounds()) {
let text_size = self
.text_size
.unwrap_or_else(|| text::Renderer::default_size(renderer).0);
let option_height =
f32::from(self.text_line_height.to_absolute(Pixels(text_size)))
+ self.padding.vertical();
*self.hovered_option = Some((cursor_position.y / option_height) as usize);
if let Some(index) = *self.hovered_option {
shell.publish((self.on_selected)(index));
return event::Status::Captured;
}
}
}
_ => {}
}
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()
}
}
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 option_height = f32::from(self.text_line_height.to_absolute(Pixels(text_size)))
+ self.padding.vertical();
let offset = viewport.y - bounds.y;
let start = (offset / option_height) as usize;
let end = ((offset + viewport.height) / option_height).ceil() as usize;
let visible_options = &self.options[start..end.min(self.options.len())];
for (i, option) in visible_options.iter().enumerate() {
let i = start + i;
let bounds = Rectangle {
x: bounds.x,
y: option_height.mul_add(i as f32, bounds.y),
width: bounds.width,
height: option_height,
};
let (color, font) = if self.selected_option == Some(i) {
let item_x = bounds.x + appearance.border_width;
let item_width = appearance.border_width.mul_add(-2.0, bounds.width);
renderer.fill_quad(
renderer::Quad {
bounds: Rectangle {
x: item_x,
width: item_width,
..bounds
},
border: Border {
radius: appearance.border_radius,
..Default::default()
},
shadow: Shadow::default(),
},
appearance.selected_background,
);
let svg_handle =
iced_core::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 == Some(i) {
let item_x = bounds.x + appearance.border_width;
let item_width = appearance.border_width.mul_add(-2.0, bounds.width);
renderer.fill_quad(
renderer::Quad {
bounds: Rectangle {
x: item_x,
width: item_width,
..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 mut bounds = Rectangle {
x: bounds.x + self.padding.left,
y: bounds.center_y(),
width: f32::INFINITY,
..bounds
};
if let Some(handle) = self.icons.get(i) {
let icon_bounds = Rectangle {
x: bounds.x,
y: bounds.y + 8.0 - (bounds.height / 2.0),
width: 20.0,
height: 20.0,
};
bounds.x += 24.0;
icon::draw(renderer, handle, icon_bounds);
}
text::Renderer::fill_text(
renderer,
Text {
content: option.as_ref().to_string(),
bounds: bounds.size(),
size: 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,
);
}
}
}
impl<'a, S: AsRef<str>, Message: 'a> From<List<'a, S, Message>>
for Element<'a, Message, crate::Theme, crate::Renderer>
{
fn from(list: List<'a, S, Message>) -> Self {
Element::new(list)
}
}