Implement top-left hot corner to toggle the Overview

Compared to third-party implementations such as waycorner:

- It works during interactive window move (no surfaces receive pointer
  focus in this case, so this cannot work through layer-shell).
- It works during drag-and-drop.
- It disables itself over fullscreen windows.
- It does not prevent direct scanout.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/niri.rs b/src/niri.rs
index 225a3702..fd317f2b 100644
--- a/src/niri.rs
+++ b/src/niri.rs
@@ -347,6 +347,7 @@ pub struct Niri {
     /// Used for limiting the notify to once per iteration, so that it's not spammed with high
     /// resolution mice.
     pub notified_activity_this_iteration: bool,
+    pub pointer_inside_hot_corner: bool,
     pub tablet_cursor_location: Option<Point<f64, Logical>>,
     pub gesture_swipe_3f_cumulative: Option<(f64, f64)>,
     pub overview_scroll_swipe_gesture: ScrollSwipeGesture,
@@ -2427,6 +2428,7 @@ impl Niri {
             pointer_inactivity_timer: None,
             pointer_inactivity_timer_got_reset: false,
             notified_activity_this_iteration: false,
+            pointer_inside_hot_corner: false,
             tablet_cursor_location: None,
             gesture_swipe_3f_cumulative: None,
             overview_scroll_swipe_gesture: ScrollSwipeGesture::new(),
@@ -2920,6 +2922,11 @@ impl Niri {
             return false;
         }
 
+        let hot_corner = Rectangle::from_size(Size::from((1., 1.)));
+        if hot_corner.contains(pos_within_output) {
+            return true;
+        }
+
         if layer_popup_under(Layer::Top) || layer_toplevel_under(Layer::Top) {
             return true;
         }
@@ -3175,6 +3182,11 @@ impl Niri {
                 .or_else(|| layer_toplevel_under(Layer::Bottom))
                 .or_else(|| layer_toplevel_under(Layer::Background));
         } else {
+            let hot_corner = Rectangle::from_size(Size::from((1., 1.)));
+            if hot_corner.contains(pos_within_output) {
+                return rv;
+            }
+
             under = under
                 .or_else(|| layer_popup_under(Layer::Top))
                 .or_else(|| layer_toplevel_under(Layer::Top));