wlr-foreign-toplevel-management: implement protocol

Well, at least as much of it as was implemented before the scene graph
refactor.

river/ForeignToplevelHandle.zig

@@ -0,0 +1,117 @@
+// This file is part of river, a dynamic tiling wayland compositor.
+//
+// Copyright 2023 The River Developers
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 3.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+const ForeignToplevelHandle = @This();
+
+const std = @import("std");
+const assert = std.debug.assert;
+const wlr = @import("wlroots");
+const wl = @import("wayland").server.wl;
+
+const server = &@import("main.zig").server;
+
+const View = @import("View.zig");
+const Seat = @import("Seat.zig");
+
+wlr_handle: ?*wlr.ForeignToplevelHandleV1 = null,
+
+foreign_activate: wl.Listener(*wlr.ForeignToplevelHandleV1.event.Activated) =
+    wl.Listener(*wlr.ForeignToplevelHandleV1.event.Activated).init(handleForeignActivate),
+foreign_fullscreen: wl.Listener(*wlr.ForeignToplevelHandleV1.event.Fullscreen) =
+    wl.Listener(*wlr.ForeignToplevelHandleV1.event.Fullscreen).init(handleForeignFullscreen),
+foreign_close: wl.Listener(*wlr.ForeignToplevelHandleV1) =
+    wl.Listener(*wlr.ForeignToplevelHandleV1).init(handleForeignClose),
+
+pub fn map(handle: *ForeignToplevelHandle) void {
+    const view = @fieldParentPtr(View, "foreign_toplevel_handle", handle);
+
+    assert(handle.wlr_handle == null);
+
+    handle.wlr_handle = wlr.ForeignToplevelHandleV1.create(server.foreign_toplevel_manager) catch {
+        std.log.err("out of memory", .{});
+        return;
+    };
+
+    handle.wlr_handle.?.events.request_activate.add(&handle.foreign_activate);
+    handle.wlr_handle.?.events.request_fullscreen.add(&handle.foreign_fullscreen);
+    handle.wlr_handle.?.events.request_close.add(&handle.foreign_close);
+
+    if (view.getTitle()) |title| handle.wlr_handle.?.setTitle(title);
+    if (view.getAppId()) |app_id| handle.wlr_handle.?.setAppId(app_id);
+}
+
+pub fn unmap(handle: *ForeignToplevelHandle) void {
+    const wlr_handle = handle.wlr_handle orelse return;
+
+    handle.foreign_activate.link.remove();
+    handle.foreign_fullscreen.link.remove();
+    handle.foreign_close.link.remove();
+
+    wlr_handle.destroy();
+
+    handle.wlr_handle = null;
+}
+
+/// Must be called just before the view's inflight state is made current.
+pub fn update(handle: *ForeignToplevelHandle) void {
+    const view = @fieldParentPtr(View, "foreign_toplevel_handle", handle);
+
+    const wlr_handle = handle.wlr_handle orelse return;
+
+    if (view.inflight.output != view.current.output) {
+        if (view.current.output) |output| wlr_handle.outputLeave(output.wlr_output);
+        if (view.inflight.output) |output| wlr_handle.outputEnter(output.wlr_output);
+    }
+
+    wlr_handle.setActivated(view.inflight.focus != 0);
+    wlr_handle.setFullscreen(view.inflight.output != null and
+        view.inflight.output.?.inflight.fullscreen == view);
+}
+
+/// Only honors the request if the view is already visible on the seat's
+/// currently focused output.
+fn handleForeignActivate(
+    listener: *wl.Listener(*wlr.ForeignToplevelHandleV1.event.Activated),
+    event: *wlr.ForeignToplevelHandleV1.event.Activated,
+) void {
+    const handle = @fieldParentPtr(ForeignToplevelHandle, "foreign_activate", listener);
+    const view = @fieldParentPtr(View, "foreign_toplevel_handle", handle);
+    const seat = @intToPtr(*Seat, event.seat.data);
+
+    seat.focus(view);
+    server.root.applyPending();
+}
+
+fn handleForeignFullscreen(
+    listener: *wl.Listener(*wlr.ForeignToplevelHandleV1.event.Fullscreen),
+    event: *wlr.ForeignToplevelHandleV1.event.Fullscreen,
+) void {
+    const handle = @fieldParentPtr(ForeignToplevelHandle, "foreign_fullscreen", listener);
+    const view = @fieldParentPtr(View, "foreign_toplevel_handle", handle);
+
+    view.pending.fullscreen = event.fullscreen;
+    server.root.applyPending();
+}
+
+fn handleForeignClose(
+    listener: *wl.Listener(*wlr.ForeignToplevelHandleV1),
+    _: *wlr.ForeignToplevelHandleV1,
+) void {
+    const handle = @fieldParentPtr(ForeignToplevelHandle, "foreign_close", listener);
+    const view = @fieldParentPtr(View, "foreign_toplevel_handle", handle);
+
+    view.close();
+}

river/Server.zig

@@ -61,6 +61,8 @@ new_layer_surface: wl.Listener(*wlr.LayerSurfaceV1),
 xwayland: if (build_options.xwayland) *wlr.Xwayland else void,
 new_xwayland_surface: if (build_options.xwayland) wl.Listener(*wlr.XwaylandSurface) else void,
 
+foreign_toplevel_manager: *wlr.ForeignToplevelManagerV1,
+
 xdg_activation: *wlr.XdgActivationV1,
 request_activate: wl.Listener(*wlr.XdgActivationV1.event.RequestActivate),
 
@@ -111,6 +113,8 @@ pub fn init(self: *Self) !void {
         self.xwayland.events.new_surface.add(&self.new_xwayland_surface);
     }
 
+    self.foreign_toplevel_manager = try wlr.ForeignToplevelManagerV1.create(self.wl_server);
+
     self.xdg_activation = try wlr.XdgActivationV1.create(self.wl_server);
     self.xdg_activation.events.request_activate.add(&self.request_activate);
     self.request_activate.setNotify(handleRequestActivate);

river/View.zig

@@ -27,6 +27,7 @@ const wl = @import("wayland").server.wl;
 const server = &@import("main.zig").server;
 const util = @import("util.zig");
 
+const ForeignToplevelHandle = @import("ForeignToplevelHandle.zig");
 const Output = @import("Output.zig");
 const SceneNodeData = @import("SceneNodeData.zig");
 const Seat = @import("Seat.zig");
@@ -147,6 +148,8 @@ float_box: wlr.Box = undefined,
 /// exiting fullscreen if there is no active layout.
 post_fullscreen_box: wlr.Box = undefined,
 
+foreign_toplevel_handle: ForeignToplevelHandle = .{},
+
 pub fn create(impl: Impl) error{OutOfMemory}!*Self {
     const view = try util.gpa.create(Self);
     errdefer util.gpa.destroy(view);
@@ -216,6 +219,8 @@ pub fn destroy(view: *Self) void {
 pub fn updateCurrent(view: *Self) void {
     const config = &server.config;
 
+    view.foreign_toplevel_handle.update();
+
     view.current = view.inflight;
     view.dropSavedSurfaceTree();
     if (view.impl == .xdg_toplevel) {
@@ -387,6 +392,8 @@ pub fn map(view: *Self) !void {
     assert(!view.mapped and !view.destroying);
     view.mapped = true;
 
+    view.foreign_toplevel_handle.map();
+
     view.pending.borders = !server.config.csdAllowed(view);
 
     if (server.input_manager.defaultSeat().focused_output) |output| {
@@ -427,14 +434,19 @@ pub fn unmap(view: *Self) void {
     assert(view.mapped and !view.destroying);
     view.mapped = false;
 
+    view.foreign_toplevel_handle.unmap();
+
     server.root.applyPending();
 }
 
-pub fn notifyTitle(self: *const Self) void {
+pub fn notifyTitle(view: *const Self) void {
+    if (view.foreign_toplevel_handle.wlr_handle) |wlr_handle| {
+        if (view.getTitle()) |title| wlr_handle.setTitle(title);
+    }
     // Send title to all status listeners attached to a seat which focuses this view
     var seat_it = server.input_manager.seats.first;
     while (seat_it) |seat_node| : (seat_it = seat_node.next) {
-        if (seat_node.data.focused == .view and seat_node.data.focused.view == self) {
+        if (seat_node.data.focused == .view and seat_node.data.focused.view == view) {
             var client_it = seat_node.data.status_trackers.first;
             while (client_it) |client_node| : (client_it = client_node.next) {
                 client_node.data.sendFocusedView();
@@ -443,6 +455,8 @@ pub fn notifyTitle(self: *const Self) void {
     }
 }
 
-pub fn notifyAppId(_: Self) void {
-    // TODO reimplement foreign-toplevel-management I guess.
+pub fn notifyAppId(view: Self) void {
+    if (view.foreign_toplevel_handle.wlr_handle) |wlr_handle| {
+        if (view.getAppId()) |app_id| wlr_handle.setAppId(app_id);
+    }
 }