1 files changed, 51 insertions, 0 deletions
diff --git a/crates/core/src/manager/hittest.rs b/crates/core/src/manager/hittest.rs
new file mode 100644
index 0000000..918acb5
--- /dev/null
+++ b/crates/core/src/manager/hittest.rs
@@ -0,0 +1,51 @@
+//! Pointer hit-testing against a window's titlebar/border/content.
+//! Split out of the original single `manager.rs` - see `super` (`mod.rs`) for
+//! `WindowManager`'s field definitions; everything here is plain `impl WindowManager`
+//! methods, unchanged from before the split.
+
+use super::*;
+
+impl WindowManager {
+    // ---- Hit testing ------------------------------------------------------
+
+    /// Topmost window whose frame contains `(x, y)`, along with what part of
+    /// its titlebar/border was hit (button, drag area, resize edge).
+    pub fn hit_test(&self, x: i32, y: i32) -> Option<(WindowId, TitlebarHit)> {
+        for w in self.order.iter().rev().filter_map(|id| self.windows.get(id)) {
+            if w.minimized {
+                continue;
+            }
+            if let Some(hit) = ResizeEdge::hit_test(w.geometry, x, y, w.decorated, w.border_width, self.resize_margin) {
+                return Some((w.id, hit));
+            }
+        }
+        None
+    }
+
+    /// Topmost non-minimised window containing a point, ignoring
+    /// decorations. Used for modifier+drag, where the grab applies anywhere
+    /// in the window rather than only on the titlebar (`hit_test`).
+    pub fn window_at(&self, x: i32, y: i32) -> Option<WindowId> {
+        self.order
+            .iter()
+            .rev()
+            .filter_map(|id| self.windows.get(id))
+            .find(|w| !w.minimized && w.geometry.contains_point(x, y))
+            .map(|w| w.id)
+    }
+
+    /// The corner of `id` nearest a point, for modifier+right-drag resize:
+    /// grabbing the closest corner is what makes the gesture feel like it
+    /// pulls the edge you aimed at (matching Hyprland's `resizewindow`).
+    pub fn nearest_corner(&self, id: WindowId, x: i32, y: i32) -> ResizeEdge {
+        let Some(w) = self.windows.get(&id) else { return ResizeEdge::BottomRight };
+        let (cx, cy) = w.geometry.center();
+        match (x < cx, y < cy) {
+            (true, true) => ResizeEdge::TopLeft,
+            (false, true) => ResizeEdge::TopRight,
+            (true, false) => ResizeEdge::BottomLeft,
+            (false, false) => ResizeEdge::BottomRight,
+        }
+    }
+
+}