From a37f86f294a8ead0264ff149392308101b9cb0a1 Mon Sep 17 00:00:00 2001
From: Conrad Irwin <conrad.irwin@gmail.com>
Date: Wed, 29 Nov 2023 22:39:15 -0700
Subject: [PATCH] Scroll the collab panel when keyboard focusing

---
 crates/collab_ui2/src/collab_panel.rs | 24 ++++++------------------
 crates/gpui2/src/elements/div.rs      | 18 ++++++++++++++++++
 2 files changed, 24 insertions(+), 18 deletions(-)

diff --git a/crates/collab_ui2/src/collab_panel.rs b/crates/collab_ui2/src/collab_panel.rs
index 8df0de797b..542dca52bc 100644
--- a/crates/collab_ui2/src/collab_panel.rs
+++ b/crates/collab_ui2/src/collab_panel.rs
@@ -1808,14 +1808,9 @@ impl CollabPanel {
             self.selection = Some(ix);
         }
 
-        // todo!()
-        // self.list_state.reset(self.entries.len());
-        // if let Some(ix) = self.selection {
-        //     self.list_state.scroll_to(ListOffset {
-        //         item_ix: ix,
-        //         offset_in_item: 0.,
-        //     });
-        // }
+        if let Some(ix) = self.selection {
+            self.scroll_handle.scroll_to_item(ix)
+        }
         cx.notify();
     }
 
@@ -1825,14 +1820,9 @@ impl CollabPanel {
             self.selection = Some(ix - 1);
         }
 
-        // todo!()
-        // self.list_state.reset(self.entries.len());
-        // if let Some(ix) = self.selection {
-        //     self.list_state.scroll_to(ListOffset {
-        //         item_ix: ix,
-        //         offset_in_item: 0.,
-        //     });
-        // }
+        if let Some(ix) = self.selection {
+            self.scroll_handle.scroll_to_item(ix)
+        }
         cx.notify();
     }
 
@@ -2350,8 +2340,6 @@ impl CollabPanel {
     }
 
     fn render_signed_in(&mut self, cx: &mut ViewContext<Self>) -> Div {
-        dbg!(&self.scroll_handle.top_item());
-
         v_stack()
             .size_full()
             .child(
diff --git a/crates/gpui2/src/elements/div.rs b/crates/gpui2/src/elements/div.rs
index 50bc678b42..3d360877a1 100644
--- a/crates/gpui2/src/elements/div.rs
+++ b/crates/gpui2/src/elements/div.rs
@@ -1491,4 +1491,22 @@ impl ScrollHandle {
             Err(ix) => ix.min(state.child_bounds.len().saturating_sub(1)),
         }
     }
+
+    /// scroll_to_item scrolls the minimal amount to ensure that the item is
+    /// fully visible
+    pub fn scroll_to_item(&self, ix: usize) {
+        let state = self.0.borrow();
+
+        let Some(bounds) = state.child_bounds.get(ix) else {
+            return;
+        };
+
+        let scroll_offset = state.offset.borrow().y;
+
+        if bounds.top() + scroll_offset < state.bounds.top() {
+            state.offset.borrow_mut().y = state.bounds.top() - bounds.top();
+        } else if bounds.bottom() + scroll_offset > state.bounds.bottom() {
+            state.offset.borrow_mut().y = state.bounds.bottom() - bounds.bottom();
+        }
+    }
 }