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//! Build and show dropdown menus.
use crate::alignment;
use crate::backend::{self, Backend};
use crate::{Primitive, Renderer};
use iced_native::{mouse, overlay, Color, Font, Padding, Point, Rectangle};
pub use iced_style::menu::Style;
impl<B> overlay::menu::Renderer for Renderer<B>
where
B: Backend + backend::Text,
{
type Style = Style;
fn decorate(
&mut self,
bounds: Rectangle,
_cursor_position: Point,
style: &Style,
(primitives, mouse_cursor): Self::Output,
) -> Self::Output {
(
Primitive::Group {
primitives: vec![
Primitive::Quad {
bounds,
background: style.background,
border_color: style.border_color,
border_width: style.border_width,
border_radius: 0.0,
},
primitives,
],
},
mouse_cursor,
)
}
fn draw<T: ToString>(
&mut self,
bounds: Rectangle,
cursor_position: Point,
viewport: &Rectangle,
options: &[T],
hovered_option: Option<usize>,
padding: Padding,
text_size: u16,
font: Font,
style: &Style,
) -> Self::Output {
use std::f32;
let is_mouse_over = bounds.contains(cursor_position);
let option_height = (text_size + padding.vertical()) as usize;
let mut primitives = Vec::new();
let offset = viewport.y - bounds.y;
let start = (offset / option_height as f32) as usize;
let end =
((offset + viewport.height) / option_height as f32).ceil() as usize;
let visible_options = &options[start..end.min(options.len())];
for (i, option) in visible_options.iter().enumerate() {
let i = start + i;
let is_selected = hovered_option == Some(i);
let bounds = Rectangle {
x: bounds.x,
y: bounds.y + (option_height * i) as f32,
width: bounds.width,
height: f32::from(text_size + padding.vertical()),
};
if is_selected {
primitives.push(Primitive::Quad {
bounds,
background: style.selected_background,
border_color: Color::TRANSPARENT,
border_width: 0.0,
border_radius: 0.0,
});
}
primitives.push(Primitive::Text {
content: option.to_string(),
bounds: Rectangle {
x: bounds.x + padding.left as f32,
y: bounds.center_y(),
width: f32::INFINITY,
..bounds
},
size: f32::from(text_size),
font,
color: if is_selected {
style.selected_text_color
} else {
style.text_color
},
horizontal_alignment: alignment::Horizontal::Left,
vertical_alignment: alignment::Vertical::Center,
});
}
(
Primitive::Group { primitives },
if is_mouse_over {
mouse::Interaction::Pointer
} else {
mouse::Interaction::default()
},
)
}
}
|
