107 lines
3.2 KiB
Rust
107 lines
3.2 KiB
Rust
//! Decorate content and apply alignment.
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use crate::backend::{self, Backend};
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use crate::defaults::Defaults;
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use crate::{Primitive, Renderer, Vector};
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use iced_native::layout::{self, Layout};
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use iced_native::{Element, Point, Rectangle, Size, Text};
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/// An element decorating some content.
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///
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/// This is an alias of an `iced_native` tooltip with a default
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/// `Renderer`.
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pub type Tooltip<'a, Message, Backend> =
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iced_native::Tooltip<'a, Message, Renderer<Backend>>;
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pub use iced_native::tooltip::Position;
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impl<B> iced_native::tooltip::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 = ();
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fn draw<Message>(
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&mut self,
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defaults: &Defaults,
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cursor_position: Point,
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content_layout: Layout<'_>,
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viewport: &Rectangle,
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content: &Element<'_, Message, Self>,
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tooltip: &Text<Self>,
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position: Position,
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gap: u16,
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) -> Self::Output {
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let bounds = content_layout.bounds();
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let (content, mouse_interaction) = content.draw(
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self,
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&defaults,
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content_layout,
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cursor_position,
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viewport,
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);
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if bounds.contains(cursor_position) {
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use iced_native::Widget;
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let tooltip_layout = Widget::<(), Self>::layout(
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tooltip,
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self,
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&layout::Limits::new(Size::ZERO, viewport.size()),
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);
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let tooltip_bounds = tooltip_layout.bounds();
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let x_center =
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bounds.x + (bounds.width - tooltip_bounds.width) / 2.0;
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let y_center =
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bounds.y + (bounds.height - tooltip_bounds.height) / 2.0;
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let gap = f32::from(gap);
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let offset = match position {
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Position::Top => Vector::new(
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x_center,
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bounds.y - tooltip_bounds.height - gap,
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),
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Position::Bottom => {
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Vector::new(x_center, bounds.y + bounds.height + gap)
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}
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Position::Left => {
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Vector::new(bounds.x - tooltip_bounds.width - gap, y_center)
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}
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Position::Right => {
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Vector::new(bounds.x + bounds.width + gap, y_center)
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}
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Position::FollowCursor => Vector::new(
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cursor_position.x,
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cursor_position.y - tooltip_bounds.height,
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),
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};
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let (tooltip, _) = Widget::<(), Self>::draw(
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tooltip,
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self,
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defaults,
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Layout::with_offset(offset, &tooltip_layout),
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cursor_position,
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viewport,
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);
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(
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Primitive::Clip {
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bounds: *viewport,
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offset: Vector::new(0, 0),
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content: Box::new(Primitive::Group {
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primitives: vec![content, tooltip],
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}),
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},
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mouse_interaction,
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)
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} else {
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(content, mouse_interaction)
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}
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}
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}
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