From 1da99f4003c100180b4821afc4e32e35c86dfdb4 Mon Sep 17 00:00:00 2001
From: Ivan Molodetskikh <yalterz@gmail.com>
Date: Fri, 5 Jul 2024 20:12:56 +0400
Subject: Implement focus-follows-mouse max-scroll-amount

---
 src/layout/mod.rs       | 16 ++++++++++++++++
 src/layout/workspace.rs | 31 +++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

(limited to 'src/layout')

diff --git a/src/layout/mod.rs b/src/layout/mod.rs
index ab7d7ec6..fadde1fb 100644
--- a/src/layout/mod.rs
+++ b/src/layout/mod.rs
@@ -947,6 +947,22 @@ impl<W: LayoutElement> Layout<W> {
         }
     }
 
+    pub fn scroll_amount_to_activate(&self, window: &W::Id) -> f64 {
+        let MonitorSet::Normal { monitors, .. } = &self.monitor_set else {
+            return 0.;
+        };
+
+        for mon in monitors {
+            for ws in &mon.workspaces {
+                if ws.has_window(window) {
+                    return ws.scroll_amount_to_activate(window);
+                }
+            }
+        }
+
+        0.
+    }
+
     pub fn activate_window(&mut self, window: &W::Id) {
         let MonitorSet::Normal {
             monitors,
diff --git a/src/layout/workspace.rs b/src/layout/workspace.rs
index c5ddfd21..625f4d5c 100644
--- a/src/layout/workspace.rs
+++ b/src/layout/workspace.rs
@@ -1391,6 +1391,37 @@ impl<W: LayoutElement> Workspace<W> {
         }
     }
 
+    pub fn scroll_amount_to_activate(&self, window: &W::Id) -> f64 {
+        let column_idx = self
+            .columns
+            .iter()
+            .position(|col| col.contains(window))
+            .unwrap();
+
+        if self.active_column_idx == column_idx {
+            return 0.;
+        }
+
+        let current_x = self.view_pos();
+        let new_view_offset = self.compute_new_view_offset_for_column(
+            current_x,
+            column_idx,
+            Some(self.active_column_idx),
+        );
+
+        // Consider the end of an ongoing animation because that's what compute to fit does too.
+        let final_x = if let Some(ViewOffsetAdjustment::Animation(anim)) = &self.view_offset_adj {
+            current_x - self.view_offset + anim.to()
+        } else {
+            current_x
+        };
+
+        let new_col_x = self.column_x(column_idx);
+        let from_view_offset = final_x - new_col_x;
+
+        (from_view_offset - new_view_offset).abs() / self.working_area.size.w
+    }
+
     pub fn activate_window(&mut self, window: &W::Id) {
         let column_idx = self
             .columns
-- 
cgit