89 lines
2.3 KiB
Rust
89 lines
2.3 KiB
Rust
use gpui::{ModelContext, Timer};
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use std::time::Duration;
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static INTERVAL: Duration = Duration::from_millis(500);
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static PAUSE_DELAY: Duration = Duration::from_millis(300);
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/// To manage the Input cursor blinking.
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///
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/// It will start blinking with a interval of 500ms.
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/// Every loop will notify the view to update the `visible`, and Input will observe this update to touch repaint.
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///
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/// The input painter will check if this in visible state, then it will draw the cursor.
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pub(crate) struct BlinkCursor {
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visible: bool,
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paused: bool,
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epoch: usize,
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}
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impl BlinkCursor {
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pub fn new() -> Self {
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Self {
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visible: false,
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paused: false,
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epoch: 0,
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}
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}
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/// Start the blinking
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pub fn start(&mut self, cx: &mut ModelContext<Self>) {
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self.blink(self.epoch, cx);
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}
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pub fn stop(&mut self, cx: &mut ModelContext<Self>) {
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self.epoch = 0;
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cx.notify();
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}
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fn next_epoch(&mut self) -> usize {
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self.epoch += 1;
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self.epoch
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}
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fn blink(&mut self, epoch: usize, cx: &mut ModelContext<Self>) {
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if self.paused || epoch != self.epoch {
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return;
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}
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self.visible = !self.visible;
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cx.notify();
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// Schedule the next blink
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let epoch = self.next_epoch();
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cx.spawn(|this, mut cx| async move {
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Timer::after(INTERVAL).await;
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if let Some(this) = this.upgrade() {
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this.update(&mut cx, |this, cx| this.blink(epoch, cx)).ok();
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}
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})
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.detach();
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}
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pub fn visible(&self) -> bool {
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// Keep showing the cursor if paused
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self.paused || self.visible
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}
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/// Pause the blinking, and delay 500ms to resume the blinking.
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pub fn pause(&mut self, cx: &mut ModelContext<Self>) {
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self.paused = true;
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cx.notify();
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// delay 500ms to start the blinking
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let epoch = self.next_epoch();
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cx.spawn(|this, mut cx| async move {
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Timer::after(PAUSE_DELAY).await;
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if let Some(this) = this.upgrade() {
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this.update(&mut cx, |this, cx| {
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this.paused = false;
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this.blink(epoch, cx);
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})
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.ok();
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}
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})
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.detach();
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}
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}
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