Merge pull request #156 from YaLTeR/resize

anvil: implement the Resize request

anvil/Cargo.toml

@@ -14,6 +14,7 @@ rand = "0.6"
 glium = { version = "0.23.0", default-features = false }
 wayland-server = "0.23"
 xkbcommon = "0.4.0"
+bitflags = "1.2.1"
 
 [dependencies.smithay]
 path = ".."

anvil/src/shell.rs

@@ -4,13 +4,17 @@ use std::{
     sync::{Arc, Mutex},
 };
 
+use bitflags::bitflags;
 use rand;
 
 use smithay::{
-    reexports::wayland_server::{
+    reexports::{
+        wayland_protocols::xdg_shell::server::xdg_toplevel,
+        wayland_server::{
             protocol::{wl_buffer, wl_pointer::ButtonState, wl_shell_surface, wl_surface},
             Display,
         },
+    },
     utils::Rectangle,
     wayland::{
         compositor::{compositor_init, CompositorToken, RegionAttributes, SurfaceAttributes, SurfaceEvent},
@@ -22,7 +26,7 @@ use smithay::{
             },
             xdg::{
                 xdg_shell_init, PopupConfigure, ShellState as XdgShellState, ToplevelConfigure, XdgRequest,
-                XdgSurfaceRole,
+                XdgSurfacePendingState, XdgSurfaceRole,
             },
         },
         SERIAL_COUNTER as SCOUNTER,
@@ -41,11 +45,7 @@ define_roles!(Roles =>
     [ CursorImage, CursorImageRole ]
 );
 
-pub type MyWindowMap = WindowMap<
+pub type MyWindowMap = WindowMap<Roles>;
-    Roles,
-    fn(&SurfaceAttributes) -> Option<(i32, i32)>,
-    fn(&SurfaceAttributes, (f64, f64)) -> bool,
->;
 
 pub type MyCompositorToken = CompositorToken<Roles>;
 
@@ -99,6 +99,182 @@ impl PointerGrab for MoveSurfaceGrab {
     }
 }
 
+bitflags! {
+    struct ResizeEdge: u32 {
+        const NONE = 0;
+        const TOP = 1;
+        const BOTTOM = 2;
+        const LEFT = 4;
+        const TOP_LEFT = 5;
+        const BOTTOM_LEFT = 6;
+        const RIGHT = 8;
+        const TOP_RIGHT = 9;
+        const BOTTOM_RIGHT = 10;
+    }
+}
+
+impl From<wl_shell_surface::Resize> for ResizeEdge {
+    #[inline]
+    fn from(x: wl_shell_surface::Resize) -> Self {
+        Self::from_bits(x.bits()).unwrap()
+    }
+}
+
+impl From<ResizeEdge> for wl_shell_surface::Resize {
+    #[inline]
+    fn from(x: ResizeEdge) -> Self {
+        Self::from_bits(x.bits()).unwrap()
+    }
+}
+
+impl From<xdg_toplevel::ResizeEdge> for ResizeEdge {
+    #[inline]
+    fn from(x: xdg_toplevel::ResizeEdge) -> Self {
+        Self::from_bits(x.to_raw()).unwrap()
+    }
+}
+
+impl From<ResizeEdge> for xdg_toplevel::ResizeEdge {
+    #[inline]
+    fn from(x: ResizeEdge) -> Self {
+        Self::from_raw(x.bits()).unwrap()
+    }
+}
+
+struct ResizeSurfaceGrab {
+    start_data: GrabStartData,
+    ctoken: MyCompositorToken,
+    toplevel: SurfaceKind<Roles>,
+    edges: ResizeEdge,
+    initial_window_size: (i32, i32),
+    last_window_size: (i32, i32),
+}
+
+impl PointerGrab for ResizeSurfaceGrab {
+    fn motion(
+        &mut self,
+        _handle: &mut PointerInnerHandle<'_>,
+        location: (f64, f64),
+        _focus: Option<(wl_surface::WlSurface, (f64, f64))>,
+        serial: u32,
+        _time: u32,
+    ) {
+        let mut dx = location.0 - self.start_data.location.0;
+        let mut dy = location.1 - self.start_data.location.1;
+
+        let mut new_window_width = self.initial_window_size.0;
+        let mut new_window_height = self.initial_window_size.1;
+
+        let left_right = ResizeEdge::LEFT | ResizeEdge::RIGHT;
+        let top_bottom = ResizeEdge::TOP | ResizeEdge::BOTTOM;
+
+        if self.edges.intersects(left_right) {
+            if self.edges.intersects(ResizeEdge::LEFT) {
+                dx = -dx;
+            }
+
+            new_window_width = (self.initial_window_size.0 as f64 + dx) as i32;
+        }
+
+        if self.edges.intersects(top_bottom) {
+            if self.edges.intersects(ResizeEdge::TOP) {
+                dy = -dy;
+            }
+
+            new_window_height = (self.initial_window_size.1 as f64 + dy) as i32;
+        }
+
+        let (min_size, max_size) =
+            self.ctoken
+                .with_surface_data(self.toplevel.get_surface().unwrap(), |attrs| {
+                    let data = attrs.user_data.get::<SurfaceData>().unwrap();
+                    (data.min_size, data.max_size)
+                });
+
+        let min_width = min_size.0.max(1);
+        let min_height = min_size.1.max(1);
+        let max_width = if max_size.0 == 0 {
+            i32::max_value()
+        } else {
+            max_size.0
+        };
+        let max_height = if max_size.1 == 0 {
+            i32::max_value()
+        } else {
+            max_size.1
+        };
+
+        new_window_width = new_window_width.max(min_width).min(max_width);
+        new_window_height = new_window_height.max(min_height).min(max_height);
+
+        self.last_window_size = (new_window_width, new_window_height);
+
+        match &self.toplevel {
+            SurfaceKind::Xdg(xdg) => xdg.send_configure(ToplevelConfigure {
+                size: Some(self.last_window_size),
+                states: vec![xdg_toplevel::State::Resizing],
+                serial,
+            }),
+            SurfaceKind::Wl(wl) => wl.send_configure(
+                (self.last_window_size.0 as u32, self.last_window_size.1 as u32),
+                self.edges.into(),
+            ),
+        }
+    }
+
+    fn button(
+        &mut self,
+        handle: &mut PointerInnerHandle<'_>,
+        button: u32,
+        state: ButtonState,
+        serial: u32,
+        time: u32,
+    ) {
+        handle.button(button, state, serial, time);
+        if handle.current_pressed().is_empty() {
+            // No more buttons are pressed, release the grab.
+            handle.unset_grab(serial, time);
+
+            if let SurfaceKind::Xdg(xdg) = &self.toplevel {
+                // Send the final configure without the resizing state.
+                xdg.send_configure(ToplevelConfigure {
+                    size: Some(self.last_window_size),
+                    states: vec![],
+                    serial,
+                });
+
+                self.ctoken
+                    .with_surface_data(self.toplevel.get_surface().unwrap(), |attrs| {
+                        let data = attrs.user_data.get_mut::<SurfaceData>().unwrap();
+                        if let ResizeState::Resizing(resize_data) = data.resize_state {
+                            data.resize_state = ResizeState::WaitingForFinalAck(resize_data, serial);
+                        } else {
+                            panic!("invalid resize state: {:?}", data.resize_state);
+                        }
+                    });
+            } else {
+                self.ctoken
+                    .with_surface_data(self.toplevel.get_surface().unwrap(), |attrs| {
+                        let data = attrs.user_data.get_mut::<SurfaceData>().unwrap();
+                        if let ResizeState::Resizing(resize_data) = data.resize_state {
+                            data.resize_state = ResizeState::WaitingForCommit(resize_data);
+                        } else {
+                            panic!("invalid resize state: {:?}", data.resize_state);
+                        }
+                    });
+            }
+        }
+    }
+
+    fn axis(&mut self, handle: &mut PointerInnerHandle<'_>, details: AxisFrame) {
+        handle.axis(details)
+    }
+
+    fn start_data(&self) -> &GrabStartData {
+        &self.start_data
+    }
+}
+
 pub fn init_shell(
     display: &mut Display,
     buffer_utils: BufferUtils,
@@ -109,11 +285,19 @@ pub fn init_shell(
     Arc<Mutex<WlShellState<Roles>>>,
     Rc<RefCell<MyWindowMap>>,
 ) {
+    // TODO: this is awkward...
+    let almost_window_map = Rc::new(RefCell::new(None::<Rc<RefCell<MyWindowMap>>>));
+    let almost_window_map_compositor = almost_window_map.clone();
+
     // Create the compositor
     let (compositor_token, _, _) = compositor_init(
         display,
         move |request, surface, ctoken| match request {
-            SurfaceEvent::Commit => surface_commit(&surface, ctoken, &buffer_utils),
+            SurfaceEvent::Commit => {
+                let window_map = almost_window_map_compositor.borrow();
+                let window_map = window_map.as_ref().unwrap();
+                surface_commit(&surface, ctoken, &buffer_utils, &*window_map)
+            }
             SurfaceEvent::Frame { callback } => callback
                 .implement_closure(|_, _| unreachable!(), None::<fn(_)>, ())
                 .done(0),
@@ -122,11 +306,8 @@ pub fn init_shell(
     );
 
     // Init a window map, to track the location of our windows
-    let window_map = Rc::new(RefCell::new(WindowMap::new(
+    let window_map = Rc::new(RefCell::new(WindowMap::new(compositor_token)));
-        compositor_token,
+    *almost_window_map.borrow_mut() = Some(window_map.clone());
-        get_size as _,
-        contains_point as _,
-    )));
 
     // init the xdg_shell
     let xdg_window_map = window_map.clone();
@@ -196,6 +377,91 @@ pub fn init_shell(
 
                 pointer.set_grab(grab, serial);
             }
+            XdgRequest::Resize {
+                surface,
+                seat,
+                serial,
+                edges,
+            } => {
+                let seat = Seat::from_resource(&seat).unwrap();
+                // TODO: touch resize.
+                let pointer = seat.get_pointer().unwrap();
+
+                // Check that this surface has a click grab.
+                if !pointer.has_grab(serial) {
+                    return;
+                }
+
+                let start_data = pointer.grab_start_data().unwrap();
+
+                // If the focus was for a different surface, ignore the request.
+                if start_data.focus.is_none()
+                    || !start_data
+                        .focus
+                        .as_ref()
+                        .unwrap()
+                        .0
+                        .as_ref()
+                        .same_client_as(surface.get_surface().unwrap().as_ref())
+                {
+                    return;
+                }
+
+                let toplevel = SurfaceKind::Xdg(surface.clone());
+                let initial_window_location = xdg_window_map.borrow().location(&toplevel).unwrap();
+                let geometry = xdg_window_map.borrow().geometry(&toplevel).unwrap();
+                let initial_window_size = (geometry.width, geometry.height);
+
+                compositor_token.with_surface_data(surface.get_surface().unwrap(), move |attrs| {
+                    attrs.user_data.get_mut::<SurfaceData>().unwrap().resize_state =
+                        ResizeState::Resizing(ResizeData {
+                            edges: edges.into(),
+                            initial_window_location,
+                            initial_window_size,
+                        });
+                });
+
+                let grab = ResizeSurfaceGrab {
+                    start_data,
+                    ctoken: compositor_token,
+                    toplevel,
+                    edges: edges.into(),
+                    initial_window_size,
+                    last_window_size: initial_window_size,
+                };
+
+                pointer.set_grab(grab, serial);
+            }
+            XdgRequest::AckConfigure { surface, .. } => {
+                let waiting_for_serial = compositor_token.with_surface_data(&surface, |attrs| {
+                    if let Some(data) = attrs.user_data.get_mut::<SurfaceData>() {
+                        if let ResizeState::WaitingForFinalAck(_, serial) = data.resize_state {
+                            return Some(serial);
+                        }
+                    }
+
+                    None
+                });
+
+                if let Some(serial) = waiting_for_serial {
+                    let acked = compositor_token
+                        .with_role_data(&surface, |role: &mut XdgSurfaceRole| {
+                            !role.pending_configures.contains(&serial)
+                        })
+                        .unwrap();
+
+                    if acked {
+                        compositor_token.with_surface_data(&surface, |attrs| {
+                            let data = attrs.user_data.get_mut::<SurfaceData>().unwrap();
+                            if let ResizeState::WaitingForFinalAck(resize_data, _) = data.resize_state {
+                                data.resize_state = ResizeState::WaitingForCommit(resize_data);
+                            } else {
+                                unreachable!()
+                            }
+                        })
+                    }
+                }
+            }
             _ => (),
         },
         log.clone(),
@@ -263,6 +529,61 @@ pub fn init_shell(
 
                     pointer.set_grab(grab, serial);
                 }
+                ShellRequest::Resize {
+                    surface,
+                    seat,
+                    serial,
+                    edges,
+                } => {
+                    let seat = Seat::from_resource(&seat).unwrap();
+                    // TODO: touch resize.
+                    let pointer = seat.get_pointer().unwrap();
+
+                    // Check that this surface has a click grab.
+                    if !pointer.has_grab(serial) {
+                        return;
+                    }
+
+                    let start_data = pointer.grab_start_data().unwrap();
+
+                    // If the focus was for a different surface, ignore the request.
+                    if start_data.focus.is_none()
+                        || !start_data
+                            .focus
+                            .as_ref()
+                            .unwrap()
+                            .0
+                            .as_ref()
+                            .same_client_as(surface.get_surface().unwrap().as_ref())
+                    {
+                        return;
+                    }
+
+                    let toplevel = SurfaceKind::Wl(surface.clone());
+                    let initial_window_location = shell_window_map.borrow().location(&toplevel).unwrap();
+                    let geometry = shell_window_map.borrow().geometry(&toplevel).unwrap();
+                    let initial_window_size = (geometry.width, geometry.height);
+
+                    compositor_token.with_surface_data(surface.get_surface().unwrap(), move |attrs| {
+                        attrs.user_data.get_mut::<SurfaceData>().unwrap().resize_state =
+                            ResizeState::Resizing(ResizeData {
+                                edges: edges.into(),
+                                initial_window_location,
+                                initial_window_size,
+                            });
+                    });
+
+                    let grab = ResizeSurfaceGrab {
+                        start_data,
+                        ctoken: compositor_token,
+                        toplevel,
+                        edges: edges.into(),
+                        initial_window_size,
+                        last_window_size: initial_window_size,
+                    };
+
+                    pointer.set_grab(grab, serial);
+                }
                 _ => (),
             }
         },
@@ -272,24 +593,117 @@ pub fn init_shell(
     (compositor_token, xdg_shell_state, wl_shell_state, window_map)
 }
 
+/// Information about the resize operation.
+#[derive(Debug, Clone, Copy, Eq, PartialEq)]
+pub struct ResizeData {
+    /// The edges the surface is being resized with.
+    edges: ResizeEdge,
+    /// The initial window location.
+    initial_window_location: (i32, i32),
+    /// The initial window size (geometry width and height).
+    initial_window_size: (i32, i32),
+}
+
+/// State of the resize operation.
+#[derive(Debug, Clone, Copy, Eq, PartialEq)]
+pub enum ResizeState {
+    /// The surface is not being resized.
+    NotResizing,
+    /// The surface is currently being resized.
+    Resizing(ResizeData),
+    /// The resize has finished, and the surface needs to ack the final configure.
+    WaitingForFinalAck(ResizeData, u32),
+    /// The resize has finished, and the surface needs to commit its final state.
+    WaitingForCommit(ResizeData),
+}
+
+impl Default for ResizeState {
+    fn default() -> Self {
+        ResizeState::NotResizing
+    }
+}
+
 #[derive(Default)]
 pub struct SurfaceData {
     pub buffer: Option<wl_buffer::WlBuffer>,
     pub texture: Option<crate::glium_drawer::TextureMetadata>,
     pub dimensions: Option<(i32, i32)>,
+    pub geometry: Option<Rectangle>,
     pub input_region: Option<RegionAttributes>,
+    pub resize_state: ResizeState,
+    /// Minimum width and height, as requested by the surface.
+    ///
+    /// `0` means unlimited.
+    pub min_size: (i32, i32),
+    /// Maximum width and height, as requested by the surface.
+    ///
+    /// `0` means unlimited.
+    pub max_size: (i32, i32),
+}
+
+impl SurfaceData {
+    /// Returns the size of the surface.
+    pub fn size(&self) -> Option<(i32, i32)> {
+        self.dimensions
+    }
+
+    /// Checks if the surface's input region contains the point.
+    pub fn contains_point(&self, point: (f64, f64)) -> bool {
+        let (w, h) = match self.size() {
+            None => return false, // If the surface has no size, it can't have an input region.
+            Some(wh) => wh,
+        };
+
+        let rect = Rectangle {
+            x: 0,
+            y: 0,
+            width: w,
+            height: h,
+        };
+
+        let point = (point.0 as i32, point.1 as i32);
+
+        // The input region is always within the surface itself, so if the surface itself doesn't contain the
+        // point we can return false.
+        if !rect.contains(point) {
+            return false;
+        }
+
+        // If there's no input region, we're done.
+        if self.input_region.is_none() {
+            return true;
+        }
+
+        self.input_region.as_ref().unwrap().contains(point)
+    }
 }
 
 fn surface_commit(
     surface: &wl_surface::WlSurface,
     token: CompositorToken<Roles>,
     buffer_utils: &BufferUtils,
+    window_map: &RefCell<MyWindowMap>,
 ) {
-    token.with_surface_data(surface, |attributes| {
+    let mut geometry = None;
+    let mut min_size = (0, 0);
+    let mut max_size = (0, 0);
+    let _ = token.with_role_data(surface, |role: &mut XdgSurfaceRole| {
+        if let XdgSurfacePendingState::Toplevel(ref state) = role.pending_state {
+            min_size = state.min_size;
+            max_size = state.max_size;
+        }
+
+        geometry = role.window_geometry;
+    });
+
+    let refresh = token.with_surface_data(surface, |attributes| {
         attributes.user_data.insert_if_missing(SurfaceData::default);
         let data = attributes.user_data.get_mut::<SurfaceData>().unwrap();
 
+        data.geometry = geometry;
         data.input_region = attributes.input_region.clone();
+        data.min_size = min_size;
+        data.max_size = max_size;
 
         // we retrieve the contents of the associated buffer and copy it
         match attributes.buffer.take() {
@@ -313,43 +727,59 @@ fn surface_commit(
             }
             None => {}
         }
+
+        window_map.borrow().find(surface)
     });
+
+    if let Some(toplevel) = refresh {
+        let mut window_map = window_map.borrow_mut();
+        window_map.refresh_toplevel(&toplevel);
+        // Get the geometry outside since it uses the token, and so would block inside.
+        let Rectangle { width, height, .. } = window_map.geometry(&toplevel).unwrap();
+
+        let new_location = token.with_surface_data(surface, |attributes| {
+            let data = attributes.user_data.get_mut::<SurfaceData>().unwrap();
+
+            let mut new_location = None;
+
+            // If the window is being resized by top or left, its location must be adjusted
+            // accordingly.
+            match data.resize_state {
+                ResizeState::Resizing(resize_data)
+                | ResizeState::WaitingForFinalAck(resize_data, _)
+                | ResizeState::WaitingForCommit(resize_data) => {
+                    let ResizeData {
+                        edges,
+                        initial_window_location,
+                        initial_window_size,
+                    } = resize_data;
+
+                    if edges.intersects(ResizeEdge::TOP_LEFT) {
+                        let mut location = window_map.location(&toplevel).unwrap();
+
+                        if edges.intersects(ResizeEdge::LEFT) {
+                            location.0 = initial_window_location.0 + (initial_window_size.0 - width);
+                        }
+                        if edges.intersects(ResizeEdge::TOP) {
+                            location.1 = initial_window_location.1 + (initial_window_size.1 - height);
                         }
 
-fn get_size(attrs: &SurfaceAttributes) -> Option<(i32, i32)> {
+                        new_location = Some(location);
-    attrs
+                    }
-        .user_data
+                }
-        .get::<SurfaceData>()
+                ResizeState::NotResizing => (),
-        .and_then(|data| data.dimensions)
             }
 
-fn contains_point(attrs: &SurfaceAttributes, point: (f64, f64)) -> bool {
+            // Finish resizing.
-    let (w, h) = match get_size(attrs) {
+            if let ResizeState::WaitingForCommit(_) = data.resize_state {
-        None => return false, // If the surface has no size, it can't have an input region.
+                data.resize_state = ResizeState::NotResizing;
-        Some(wh) => wh,
-    };
-
-    let rect = Rectangle {
-        x: 0,
-        y: 0,
-        width: w,
-        height: h,
-    };
-
-    let point = (point.0 as i32, point.1 as i32);
-
-    // The input region is always within the surface itself, so if the surface itself doesn't contain the
-    // point we can return false.
-    if !rect.contains(point) {
-        return false;
             }
 
-    let input_region = &attrs.user_data.get::<SurfaceData>().unwrap().input_region;
+            new_location
+        });
 
-    // If there's no input region, we're done.
+        if let Some(location) = new_location {
-    if input_region.is_none() {
+            window_map.set_location(&toplevel, location);
-        return true;
+        }
     }
-
-    input_region.as_ref().unwrap().contains(point)
 }

anvil/src/window_map.rs

@@ -4,7 +4,7 @@ use smithay::{
     reexports::wayland_server::protocol::wl_surface,
     utils::Rectangle,
     wayland::{
-        compositor::{roles::Role, CompositorToken, SubsurfaceRole, SurfaceAttributes, TraversalAction},
+        compositor::{roles::Role, CompositorToken, SubsurfaceRole, TraversalAction},
         shell::{
             legacy::{ShellSurface, ShellSurfaceRole},
             xdg::{ToplevelSurface, XdgSurfaceRole},
@@ -12,11 +12,23 @@ use smithay::{
     },
 };
 
+use crate::shell::SurfaceData;
+
 pub enum Kind<R> {
     Xdg(ToplevelSurface<R>),
     Wl(ShellSurface<R>),
 }
 
+// We implement Clone manually because #[derive(..)] would require R: Clone.
+impl<R> Clone for Kind<R> {
+    fn clone(&self) -> Self {
+        match self {
+            Kind::Xdg(xdg) => Kind::Xdg(xdg.clone()),
+            Kind::Wl(wl) => Kind::Wl(wl.clone()),
+        }
+    }
+}
+
 impl<R> Kind<R>
 where
     R: Role<SubsurfaceRole> + Role<XdgSurfaceRole> + Role<ShellSurfaceRole> + 'static,
@@ -46,10 +58,11 @@ where
 
 struct Window<R> {
     location: (i32, i32),
-    /// A bounding box over the input areas of this window and its children.
+    /// A bounding box over this window and its children.
     ///
-    /// Used for the fast path of the check in `matching`.
+    /// Used for the fast path of the check in `matching`, and as the fall-back for the window
-    input_bbox: Rectangle,
+    /// geometry if that's not set explicitly.
+    bbox: Rectangle,
     toplevel: Kind<R>,
 }
 
@@ -59,19 +72,12 @@ where
 {
     /// Finds the topmost surface under this point if any and returns it together with the location of this
     /// surface.
-    ///
+    fn matching(
-    /// You need to provide a `contains_point` function which checks if the point (in surface-local
-    /// coordinates) is within the input region of the given `SurfaceAttributes`.
-    fn matching<F>(
         &self,
         point: (f64, f64),
         ctoken: CompositorToken<R>,
-        contains_point: F,
+    ) -> Option<(wl_surface::WlSurface, (f64, f64))> {
-    ) -> Option<(wl_surface::WlSurface, (f64, f64))>
+        if !self.bbox.contains((point.0 as i32, point.1 as i32)) {
-    where
-        F: Fn(&SurfaceAttributes, (f64, f64)) -> bool,
-    {
-        if !self.input_bbox.contains((point.0 as i32, point.1 as i32)) {
             return None;
         }
         // need to check more carefully
@@ -81,13 +87,18 @@ where
                 wl_surface,
                 self.location,
                 |wl_surface, attributes, role, &(mut x, mut y)| {
+                    let data = attributes.user_data.get::<SurfaceData>();
+
                     if let Ok(subdata) = Role::<SubsurfaceRole>::data(role) {
                         x += subdata.location.0;
                         y += subdata.location.1;
                     }
 
                     let surface_local_point = (point.0 - x as f64, point.1 - y as f64);
-                    if contains_point(attributes, surface_local_point) {
+                    if data
+                        .map(|data| data.contains_point(surface_local_point))
+                        .unwrap_or(false)
+                    {
                         *found.borrow_mut() = Some((wl_surface.clone(), (x as f64, y as f64)));
                     }
 
@@ -103,10 +114,7 @@ where
         found.into_inner()
     }
 
-    fn self_update<F>(&mut self, ctoken: CompositorToken<R>, get_size: F)
+    fn self_update(&mut self, ctoken: CompositorToken<R>) {
-    where
-        F: Fn(&SurfaceAttributes) -> Option<(i32, i32)>,
-    {
         let (base_x, base_y) = self.location;
         let (mut min_x, mut min_y, mut max_x, mut max_y) = (base_x, base_y, base_x, base_y);
         if let Some(wl_surface) = self.toplevel.get_surface() {
@@ -114,28 +122,24 @@ where
                 wl_surface,
                 (base_x, base_y),
                 |_, attributes, role, &(mut x, mut y)| {
-                    // The input region is intersected with the surface size, so the surface size
+                    let data = attributes.user_data.get::<SurfaceData>();
-                    // can serve as an approximation for the input bounding box.
+
-                    if let Some((w, h)) = get_size(attributes) {
+                    if let Some((w, h)) = data.and_then(SurfaceData::size) {
                         if let Ok(subdata) = Role::<SubsurfaceRole>::data(role) {
                             x += subdata.location.0;
                             y += subdata.location.1;
                         }
-                        // update the bounding box
+
-                        if x < min_x {
+                        // Update the bounding box.
-                            min_x = x;
+                        min_x = min_x.min(x);
-                        }
+                        min_y = min_y.min(y);
-                        if y < min_y {
+                        max_x = max_x.max(x + w);
-                            min_y = y;
+                        max_y = max_y.max(y + h);
-                        }
+
-                        if x + w > max_x {
-                            max_x = x + w;
-                        }
-                        if y + h > max_y {
-                            max_y = y + w;
-                        }
                         TraversalAction::DoChildren((x, y))
                     } else {
+                        // If the parent surface is unmapped, then the child surfaces are hidden as
+                        // well, no need to consider them here.
                         TraversalAction::SkipChildren
                     }
                 },
@@ -143,52 +147,54 @@ where
                 |_, _, _, _| true,
             );
         }
-        self.input_bbox = Rectangle {
+        self.bbox = Rectangle {
             x: min_x,
             y: min_y,
             width: max_x - min_x,
             height: max_y - min_y,
         };
     }
+
+    /// Returns the geometry of this window.
+    pub fn geometry(&self, ctoken: CompositorToken<R>) -> Rectangle {
+        // It's the set geometry with the full bounding box as the fallback.
+        ctoken
+            .with_surface_data(self.toplevel.get_surface().unwrap(), |attributes| {
+                attributes.user_data.get::<SurfaceData>().unwrap().geometry
+            })
+            .unwrap_or(self.bbox)
+    }
 }
 
-pub struct WindowMap<R, F, G> {
+pub struct WindowMap<R> {
     ctoken: CompositorToken<R>,
     windows: Vec<Window<R>>,
-    /// A function returning the surface size.
-    get_size: F,
-    /// A function that checks if the point is in the surface's input region.
-    contains_point: G,
 }
 
-impl<R, F, G> WindowMap<R, F, G>
+impl<R> WindowMap<R>
 where
-    F: Fn(&SurfaceAttributes) -> Option<(i32, i32)>,
-    G: Fn(&SurfaceAttributes, (f64, f64)) -> bool,
     R: Role<SubsurfaceRole> + Role<XdgSurfaceRole> + Role<ShellSurfaceRole> + 'static,
 {
-    pub fn new(ctoken: CompositorToken<R>, get_size: F, contains_point: G) -> Self {
+    pub fn new(ctoken: CompositorToken<R>) -> Self {
         WindowMap {
             ctoken,
             windows: Vec::new(),
-            get_size,
-            contains_point,
         }
     }
 
     pub fn insert(&mut self, toplevel: Kind<R>, location: (i32, i32)) {
         let mut window = Window {
             location,
-            input_bbox: Rectangle::default(),
+            bbox: Rectangle::default(),
             toplevel,
         };
-        window.self_update(self.ctoken, &self.get_size);
+        window.self_update(self.ctoken);
         self.windows.insert(0, window);
     }
 
     pub fn get_surface_under(&self, point: (f64, f64)) -> Option<(wl_surface::WlSurface, (f64, f64))> {
         for w in &self.windows {
-            if let Some(surface) = w.matching(point, self.ctoken, &self.contains_point) {
+            if let Some(surface) = w.matching(point, self.ctoken) {
                 return Some(surface);
             }
         }
@@ -201,7 +207,7 @@ where
     ) -> Option<(wl_surface::WlSurface, (f64, f64))> {
         let mut found = None;
         for (i, w) in self.windows.iter().enumerate() {
-            if let Some(surface) = w.matching(point, self.ctoken, &self.contains_point) {
+            if let Some(surface) = w.matching(point, self.ctoken) {
                 found = Some((i, surface));
                 break;
             }
@@ -227,7 +233,14 @@ where
     pub fn refresh(&mut self) {
         self.windows.retain(|w| w.toplevel.alive());
         for w in &mut self.windows {
-            w.self_update(self.ctoken, &self.get_size);
+            w.self_update(self.ctoken);
+        }
+    }
+
+    /// Refreshes the state of the toplevel, if it exists.
+    pub fn refresh_toplevel(&mut self, toplevel: &Kind<R>) {
+        if let Some(w) = self.windows.iter_mut().find(|w| w.toplevel.equals(toplevel)) {
+            w.self_update(self.ctoken);
         }
     }
 
@@ -235,6 +248,21 @@ where
         self.windows.clear();
     }
 
+    /// Finds the toplevel corresponding to the given `WlSurface`.
+    pub fn find(&self, surface: &wl_surface::WlSurface) -> Option<Kind<R>> {
+        self.windows.iter().find_map(|w| {
+            if w.toplevel
+                .get_surface()
+                .map(|s| s.as_ref().equals(surface.as_ref()))
+                .unwrap_or(false)
+            {
+                Some(w.toplevel.clone())
+            } else {
+                None
+            }
+        })
+    }
+
     /// Returns the location of the toplevel, if it exists.
     pub fn location(&self, toplevel: &Kind<R>) -> Option<(i32, i32)> {
         self.windows
@@ -247,7 +275,15 @@ where
     pub fn set_location(&mut self, toplevel: &Kind<R>, location: (i32, i32)) {
         if let Some(w) = self.windows.iter_mut().find(|w| w.toplevel.equals(toplevel)) {
             w.location = location;
-            w.self_update(self.ctoken, &self.get_size);
+            w.self_update(self.ctoken);
         }
     }
+
+    /// Returns the geometry of the toplevel, if it exists.
+    pub fn geometry(&self, toplevel: &Kind<R>) -> Option<Rectangle> {
+        self.windows
+            .iter()
+            .find(|w| w.toplevel.equals(toplevel))
+            .map(|w| w.geometry(self.ctoken))
+    }
 }

src/wayland/shell/legacy/mod.rs

@@ -92,6 +92,17 @@ pub struct ShellSurface<R> {
     token: CompositorToken<R>,
 }
 
+// We implement Clone manually because #[derive(..)] would require R: Clone.
+impl<R> Clone for ShellSurface<R> {
+    fn clone(&self) -> Self {
+        Self {
+            wl_surface: self.wl_surface.clone(),
+            shell_surface: self.shell_surface.clone(),
+            token: self.token.clone(),
+        }
+    }
+}
+
 impl<R> ShellSurface<R>
 where
     R: Role<ShellSurfaceRole> + 'static,

src/wayland/shell/xdg/mod.rs

@@ -472,6 +472,7 @@ where
     }
 }
 
+#[derive(Clone)]
 pub(crate) enum ToplevelKind {
     Xdg(xdg_toplevel::XdgToplevel),
     ZxdgV6(zxdg_toplevel_v6::ZxdgToplevelV6),
@@ -484,6 +485,17 @@ pub struct ToplevelSurface<R> {
     token: CompositorToken<R>,
 }
 
+// We implement Clone manually because #[derive(..)] would require R: Clone.
+impl<R> Clone for ToplevelSurface<R> {
+    fn clone(&self) -> Self {
+        Self {
+            wl_surface: self.wl_surface.clone(),
+            shell_surface: self.shell_surface.clone(),
+            token: self.token.clone(),
+        }
+    }
+}
+
 impl<R> ToplevelSurface<R>
 where
     R: Role<XdgSurfaceRole> + 'static,
@@ -929,4 +941,11 @@ pub enum XdgRequest<R> {
         /// location of the menu request
         location: (i32, i32),
     },
+    /// A surface has acknowledged a configure serial.
+    AckConfigure {
+        /// The surface.
+        surface: wl_surface::WlSurface,
+        /// The configure serial.
+        serial: u32,
+    },
 }

src/wayland/shell/xdg/xdg_handlers.rs

@@ -333,6 +333,12 @@ where
                     role_data.configured = true;
                 })
                 .expect("xdg_surface exists but surface has not shell_surface role?!");
+
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
+            (&mut *user_impl)(XdgRequest::AckConfigure {
+                surface: data.wl_surface.clone(),
+                serial,
+            });
         }
         _ => unreachable!(),
     }
@@ -467,7 +473,7 @@ where
         }
         xdg_toplevel::Request::SetMinSize { width, height } => {
             with_surface_toplevel_data(&data.shell_data, &toplevel, |toplevel_data| {
-                toplevel_data.max_size = (width, height);
+                toplevel_data.min_size = (width, height);
             });
         }
         xdg_toplevel::Request::SetMaximized => {

src/wayland/shell/xdg/zxdgv6_handlers.rs

@@ -349,6 +349,12 @@ fn xdg_surface_implementation<R>(
                     role_data.configured = true;
                 })
                 .expect("xdg_surface exists but surface has not shell_surface role?!");
+
+            let mut user_impl = data.shell_data.user_impl.borrow_mut();
+            (&mut *user_impl)(XdgRequest::AckConfigure {
+                surface: data.wl_surface.clone(),
+                serial,
+            });
         }
         _ => unreachable!(),
     }
@@ -485,7 +491,7 @@ where
         }
         zxdg_toplevel_v6::Request::SetMinSize { width, height } => {
             with_surface_toplevel_data::<R, _>(&toplevel, |toplevel_data| {
-                toplevel_data.max_size = (width, height);
+                toplevel_data.min_size = (width, height);
             });
         }
         zxdg_toplevel_v6::Request::SetMaximized => {