chore: refactor the input component (#165)

* refactor the input component

* fix clippy

* clean up

crates/ui/src/input/blink_cursor.rs

@@ -1,9 +1,10 @@
 use std::time::Duration;
 
-use gpui::{Context, Timer};
+use gpui::{px, Context, Pixels, Timer};
 
 static INTERVAL: Duration = Duration::from_millis(500);
 static PAUSE_DELAY: Duration = Duration::from_millis(300);
+pub(super) const CURSOR_WIDTH: Pixels = px(1.5);
 
 /// To manage the Input cursor blinking.
 ///
@@ -11,7 +12,7 @@ static PAUSE_DELAY: Duration = Duration::from_millis(300);
 /// Every loop will notify the view to update the `visible`, and Input will observe this update to touch repaint.
 ///
 /// The input painter will check if this in visible state, then it will draw the cursor.
-pub(crate) struct BlinkCursor {
+pub struct BlinkCursor {
     visible: bool,
     paused: bool,
     epoch: usize,
@@ -52,10 +53,8 @@ impl BlinkCursor {
 
         // Schedule the next blink
         let epoch = self.next_epoch();
-
         cx.spawn(async move |this, cx| {
             Timer::after(INTERVAL).await;
-
             if let Some(this) = this.upgrade() {
                 this.update(cx, |this, cx| this.blink(epoch, cx)).ok();
             }
@@ -71,11 +70,11 @@ impl BlinkCursor {
     /// Pause the blinking, and delay 500ms to resume the blinking.
     pub fn pause(&mut self, cx: &mut Context<Self>) {
         self.paused = true;
+        self.visible = true;
         cx.notify();
 
         // delay 500ms to start the blinking
         let epoch = self.next_epoch();
-
         cx.spawn(async move |this, cx| {
             Timer::after(PAUSE_DELAY).await;
 
@@ -90,3 +89,9 @@ impl BlinkCursor {
         .detach();
     }
 }
+
+impl Default for BlinkCursor {
+    fn default() -> Self {
+        Self::new()
+    }
+}