74 lines
2.3 KiB
Rust
74 lines
2.3 KiB
Rust
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use crossterm::event::Event;
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use helix_core::Position;
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use helix_view::{
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graphics::{CursorKind, Rect},
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Editor,
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};
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use tui::buffer::Buffer;
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use crate::compositor::{Component, Context, EventResult};
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/// Contains a component placed in the center of the parent component
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pub struct Overlay<T> {
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/// Child component
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pub content: T,
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/// Function to compute the size and position of the child component
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pub calc_child_size: Box<dyn Fn(Rect) -> Rect>,
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}
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/// Surrounds the component with a margin of 5% on each side, and an additional 2 rows at the bottom
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pub fn overlayed<T>(content: T) -> Overlay<T> {
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Overlay {
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content,
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calc_child_size: Box::new(|rect: Rect| clip_rect_relative(rect.clip_bottom(2), 90, 90)),
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}
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}
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fn clip_rect_relative(rect: Rect, percent_horizontal: u8, percent_vertical: u8) -> Rect {
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fn mul_and_cast(size: u16, factor: u8) -> u16 {
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((size as u32) * (factor as u32) / 100).try_into().unwrap()
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}
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let inner_w = mul_and_cast(rect.width, percent_horizontal);
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let inner_h = mul_and_cast(rect.height, percent_vertical);
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let offset_x = rect.width.saturating_sub(inner_w) / 2;
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let offset_y = rect.height.saturating_sub(inner_h) / 2;
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Rect {
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x: rect.x + offset_x,
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y: rect.y + offset_y,
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width: inner_w,
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height: inner_h,
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}
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}
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impl<T: Component + 'static> Component for Overlay<T> {
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fn render(&mut self, area: Rect, frame: &mut Buffer, ctx: &mut Context) {
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let dimensions = (self.calc_child_size)(area);
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self.content.render(dimensions, frame, ctx)
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}
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fn required_size(&mut self, (width, height): (u16, u16)) -> Option<(u16, u16)> {
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let area = Rect {
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x: 0,
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y: 0,
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width,
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height,
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};
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let dimensions = (self.calc_child_size)(area);
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let viewport = (dimensions.width, dimensions.height);
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let _ = self.content.required_size(viewport)?;
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Some((width, height))
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}
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fn handle_event(&mut self, event: Event, ctx: &mut Context) -> EventResult {
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self.content.handle_event(event, ctx)
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}
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fn cursor(&self, area: Rect, ctx: &Editor) -> (Option<Position>, CursorKind) {
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let dimensions = (self.calc_child_size)(area);
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self.content.cursor(dimensions, ctx)
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}
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}
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