From af152f7f3ead8625a0bcef2299a239273a88aa46 Mon Sep 17 00:00:00 2001
From: Julian Orth <ju.orth@gmail.com>
Date: Sun, 10 Apr 2022 01:54:16 +0200
Subject: [PATCH] autocommit 2022-04-10 01:54:16 CEST

---
 src/backends/metal/input.rs |  2 +-
 src/backends/x.rs           |  3 ++-
 src/ifs/wl_seat.rs          |  2 ++
 src/ifs/wl_surface.rs       |  4 ++--
 src/tree.rs                 |  2 +-
 src/tree/container.rs       | 41 +++++++++++++++++++++++++++++++++++++
 6 files changed, 49 insertions(+), 5 deletions(-)

diff --git a/src/backends/metal/input.rs b/src/backends/metal/input.rs
index e31bd625..a822b1eb 100644
--- a/src/backends/metal/input.rs
+++ b/src/backends/metal/input.rs
@@ -14,6 +14,7 @@ use {
     },
     std::rc::Rc,
 };
+use crate::ifs::wl_seat::PX_PER_SCROLL;
 
 macro_rules! unpack {
     ($slf:expr, $ev:expr) => {{
@@ -121,7 +122,6 @@ impl MetalBackend {
     }
 
     fn handle_pointer_axis(self: &Rc<Self>, event: LibInputEvent, source: AxisSource) {
-        const PX_PER_SCROLL: f64 = 15.0;
         const ONE_TWENTRY: f64 = 120.0;
         let (event, dev) = unpack!(self, event, pointer_event);
         let axes = [
diff --git a/src/backends/x.rs b/src/backends/x.rs
index 8016864e..3318882d 100644
--- a/src/backends/x.rs
+++ b/src/backends/x.rs
@@ -54,6 +54,7 @@ use {
     },
     thiserror::Error,
 };
+use crate::ifs::wl_seat::PX_PER_SCROLL;
 
 #[derive(Debug, Error)]
 pub enum XBackendError {
@@ -729,7 +730,7 @@ impl XBackendData {
                     };
                     seat.mouse_event(InputEvent::AxisSource(AxisSource::Wheel));
                     seat.mouse_event(InputEvent::AxisDiscrete(val, axis));
-                    seat.mouse_event(InputEvent::Axis(Fixed::from_int(val * 15), axis));
+                    seat.mouse_event(InputEvent::Axis((val as f64 * PX_PER_SCROLL).into(), axis));
                     seat.mouse_event(InputEvent::Frame);
                 }
             } else {
diff --git a/src/ifs/wl_seat.rs b/src/ifs/wl_seat.rs
index f09dfdff..6edda577 100644
--- a/src/ifs/wl_seat.rs
+++ b/src/ifs/wl_seat.rs
@@ -74,6 +74,8 @@ pub const BTN_LEFT: u32 = 0x110;
 
 pub const SEAT_NAME_SINCE: u32 = 2;
 
+pub const PX_PER_SCROLL: f64 = 15.0;
+
 #[derive(Clone)]
 pub struct Dnd {
     pub seat: Rc<WlSeatGlobal>,
diff --git a/src/ifs/wl_surface.rs b/src/ifs/wl_surface.rs
index 074f7bd7..d82548af 100644
--- a/src/ifs/wl_surface.rs
+++ b/src/ifs/wl_surface.rs
@@ -799,8 +799,8 @@ impl Node for WlSurface {
         seat.button_surface(&self, button, state);
     }
 
-    fn axis_event(&self, seat: &WlSeatGlobal, event: &PendingScroll) {
-        seat.scroll_surface(self, event);
+    fn axis_event(self: Rc<Self>, seat: &WlSeatGlobal, event: &PendingScroll) {
+        seat.scroll_surface(&*self, event);
     }
 
     fn focus(self: Rc<Self>, seat: &Rc<WlSeatGlobal>) {
diff --git a/src/tree.rs b/src/tree.rs
index 76da4973..72f169d6 100644
--- a/src/tree.rs
+++ b/src/tree.rs
@@ -197,7 +197,7 @@ pub trait Node {
         let _ = state;
     }
 
-    fn axis_event(&self, seat: &WlSeatGlobal, event: &PendingScroll) {
+    fn axis_event(self: Rc<Self>, seat: &WlSeatGlobal, event: &PendingScroll) {
         let _ = seat;
         let _ = event;
     }
diff --git a/src/tree/container.rs b/src/tree/container.rs
index 5d39be37..a6cc463c 100644
--- a/src/tree/container.rs
+++ b/src/tree/container.rs
@@ -32,6 +32,8 @@ use {
         rc::Rc,
     },
 };
+use crate::ifs::wl_seat::PX_PER_SCROLL;
+use crate::ifs::wl_seat::wl_pointer::{PendingScroll, VERTICAL_SCROLL};
 
 #[allow(dead_code)]
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
@@ -111,6 +113,7 @@ pub struct ContainerNode {
     state: Rc<State>,
     pub render_data: RefCell<ContainerRenderData>,
     visible: Cell<bool>,
+    scroll: Cell<f64>,
 }
 
 impl Debug for ContainerNode {
@@ -209,6 +212,7 @@ impl ContainerNode {
             state: state.clone(),
             render_data: Default::default(),
             visible: Cell::new(false),
+            scroll: Cell::new(0.0),
         });
         child.set_parent(slf.clone());
         slf
@@ -1044,6 +1048,43 @@ impl Node for ContainerNode {
         }
     }
 
+    fn axis_event(self: Rc<Self>, seat: &WlSeatGlobal, event: &PendingScroll) {
+        let mut seat_datas = self.seats.borrow_mut();
+        let seat_data = match seat_datas.get_mut(&seat.id()) {
+            Some(s) => s,
+            _ => return,
+        };
+        if seat_data.y > self.state.theme.title_height.get() {
+            return;
+        }
+        let cur_mc = match self.mono_child.get() {
+            Some(mc) => mc,
+            _ => return,
+        };
+        let scroll = match event.axis[VERTICAL_SCROLL as usize].get() {
+            Some(s) => s,
+            _ => return,
+        };
+        let mut scroll = self.scroll.get() + f64::from(scroll);
+        let discrete = (scroll / PX_PER_SCROLL).round();
+        scroll -= discrete * PX_PER_SCROLL;
+        self.scroll.set(scroll);
+        let discrete = discrete as i32;
+        let mut new_mc = cur_mc.clone();
+        for _ in 0..discrete.abs() {
+            let new = if discrete < 0 {
+                new_mc.prev()
+            } else {
+                new_mc.next()
+            };
+            new_mc = match new {
+                Some(n) => n,
+                None => break,
+            };
+        }
+        self.activate_child(&new_mc);
+    }
+
     fn focus_parent(&self, seat: &Rc<WlSeatGlobal>) {
         self.parent.get().focus_self(seat);
     }