Pass how many lines the editor should expand to in auto height mode

zed/src/editor.rs

@@ -272,9 +272,10 @@ pub enum SelectPhase {
     End,
 }
 
-enum EditorMode {
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub enum EditorMode {
     SingleLine,
-    AutoHeight,
+    AutoHeight { max_lines: usize },
     Full,
 }
 
@@ -301,10 +302,9 @@ pub struct Editor {
 }
 
 pub struct Snapshot {
+    pub mode: EditorMode,
     pub display_snapshot: DisplayMapSnapshot,
     pub placeholder_text: Option<Arc<str>>,
-    pub gutter_visible: bool,
-    pub auto_height: bool,
     pub theme: Arc<Theme>,
     pub font_family: FamilyId,
     pub font_size: f32,
@@ -332,10 +332,14 @@ impl Editor {
         view
     }
 
-    pub fn auto_height(settings: watch::Receiver<Settings>, cx: &mut ViewContext<Self>) -> Self {
+    pub fn auto_height(
+        max_lines: usize,
+        settings: watch::Receiver<Settings>,
+        cx: &mut ViewContext<Self>,
+    ) -> Self {
         let buffer = cx.add_model(|cx| Buffer::new(0, String::new(), cx));
         let mut view = Self::for_buffer(buffer, settings, cx);
-        view.mode = EditorMode::AutoHeight;
+        view.mode = EditorMode::AutoHeight { max_lines };
         view
     }
 
@@ -407,9 +411,8 @@ impl Editor {
         let settings = self.settings.borrow();
 
         Snapshot {
+            mode: self.mode,
             display_snapshot: self.display_map.update(cx, |map, cx| map.snapshot(cx)),
-            gutter_visible: matches!(self.mode, EditorMode::Full),
-            auto_height: matches!(self.mode, EditorMode::AutoHeight),
             scroll_position: self.scroll_position,
             scroll_top_anchor: self.scroll_top_anchor.clone(),
             theme: settings.theme.clone(),
@@ -464,7 +467,7 @@ impl Editor {
         let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));
         let mut scroll_position =
             compute_scroll_position(&display_map, self.scroll_position, &self.scroll_top_anchor);
-        let max_scroll_top = if matches!(self.mode, EditorMode::AutoHeight) {
+        let max_scroll_top = if matches!(self.mode, EditorMode::AutoHeight { .. }) {
             (display_map.max_point().row() as f32 - visible_lines + 1.).max(0.)
         } else {
             display_map.max_point().row().saturating_sub(1) as f32
@@ -496,7 +499,7 @@ impl Editor {
             .row() as f32
             + 1.0;
 
-        let margin = if matches!(self.mode, EditorMode::AutoHeight) {
+        let margin = if matches!(self.mode, EditorMode::AutoHeight { .. }) {
             0.
         } else {
             ((visible_lines - (last_cursor_bottom - first_cursor_top)) / 2.0)
@@ -760,7 +763,7 @@ impl Editor {
     fn newline(&mut self, Newline(insert_newline): &Newline, cx: &mut ViewContext<Self>) {
         match self.mode {
             EditorMode::SingleLine => cx.propagate_action(),
-            EditorMode::AutoHeight => {
+            EditorMode::AutoHeight { .. } => {
                 if *insert_newline {
                     self.insert(&Insert("\n".into()), cx);
                 } else {