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