1 files changed, 146 insertions, 0 deletions
diff --git a/src/InputManager.zig b/src/InputManager.zig
new file mode 100644
index 0000000..3a95346
--- /dev/null
+++ b/src/InputManager.zig
@@ -0,0 +1,146 @@
+// This file is part of river, a dynamic tiling wayland compositor.
+//
+// Copyright 2020 Isaac Freund
+//
+// 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, either version 3 of the License, or
+// (at your option) any later version.
+//
+// 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 Self = @This();
+
+const std = @import("std");
+
+const c = @import("c.zig");
+
+const Log = @import("log.zig").Log;
+const Seat = @import("Seat.zig");
+const Server = @import("Server.zig");
+
+const default_seat_name = "default";
+
+server: *Server,
+
+wlr_input_inhibit_manager: *c.wlr_input_inhibit_manager,
+
+seats: std.TailQueue(Seat),
+default_seat: *Seat,
+
+exclusive_client: ?*c.wl_client,
+
+listen_inhibit_activate: c.wl_listener,
+listen_inhibit_deactivate: c.wl_listener,
+listen_new_input: c.wl_listener,
+
+pub fn init(self: *Self, server: *Server) !void {
+    self.server = server;
+
+    // This is automatically freed when the display is destroyed
+    self.wlr_input_inhibit_manager =
+        c.wlr_input_inhibit_manager_create(server.wl_display) orelse
+        return error.CantCreateInputInhibitManager;
+
+    self.seats = std.TailQueue(Seat).init();
+
+    const seat_node = try server.allocator.create(std.TailQueue(Seat).Node);
+    try seat_node.data.init(self, default_seat_name);
+    self.default_seat = &seat_node.data;
+    self.seats.prepend(seat_node);
+
+    self.exclusive_client = null;
+
+    // Set up all listeners
+    self.listen_inhibit_activate.notify = handleInhibitActivate;
+    c.wl_signal_add(
+        &self.wlr_input_inhibit_manager.events.activate,
+        &self.listen_inhibit_activate,
+    );
+
+    self.listen_inhibit_deactivate.notify = handleInhibitDeactivate;
+    c.wl_signal_add(
+        &self.wlr_input_inhibit_manager.events.deactivate,
+        &self.listen_inhibit_deactivate,
+    );
+
+    self.listen_new_input.notify = handleNewInput;
+    c.wl_signal_add(&self.server.wlr_backend.events.new_input, &self.listen_new_input);
+}
+
+pub fn deinit(self: *Self) void {
+    while (self.seats.pop()) |seat_node| {
+        seat_node.data.deinit();
+        self.server.allocator.destroy(seat_node);
+    }
+}
+
+/// Must be called whenever a view is unmapped.
+pub fn handleViewUnmap(self: Self, view: *View) void {
+    var it = self.seats.first;
+    while (it) |node| : (it = node.next) {
+        const seat = &node.data;
+        seat.handleViewUnmap(view);
+    }
+}
+
+/// Returns true if input is currently allowed on the passed surface.
+pub fn inputAllowed(self: Self, wlr_surface: *c.wlr_surface) bool {
+    return if (self.exclusive_client) |exclusive_client|
+        exclusive_client == c.wl_resource_get_client(wlr_surface.resource)
+    else
+        true;
+}
+
+fn handleInhibitActivate(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
+    const self = @fieldParentPtr(Self, "listen_inhibit_activate", listener.?);
+
+    Log.Debug.log("Input inhibitor activated", .{});
+
+    // Clear focus of all seats
+    var seat_it = self.seats.first;
+    while (seat_it) |seat_node| : (seat_it = seat_node.next) {
+        seat_node.data.setFocusRaw(.{ .none = {} });
+    }
+
+    self.exclusive_client = self.wlr_input_inhibit_manager.active_client;
+}
+
+fn handleInhibitDeactivate(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
+    const self = @fieldParentPtr(Self, "listen_inhibit_deactivate", listener.?);
+
+    Log.Debug.log("Input inhibitor deactivated", .{});
+
+    self.exclusive_client = null;
+
+    // Calling arrangeLayers() like this ensures that any top or overlay,
+    // keyboard-interactive surfaces will re-grab focus.
+    var output_it = self.server.root.outputs.first;
+    while (output_it) |output_node| : (output_it = output_node.next) {
+        output_node.data.arrangeLayers();
+    }
+
+    // After ensuring that any possible layer surface focus grab has occured,
+    // have each Seat handle focus.
+    var seat_it = self.seats.first;
+    while (seat_it) |seat_node| : (seat_it = seat_node.next) {
+        seat_node.data.focus(null);
+    }
+}
+
+/// This event is raised by the backend when a new input device becomes available.
+fn handleNewInput(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
+    const self = @fieldParentPtr(Self, "listen_new_input", listener.?);
+    const device = @ptrCast(*c.wlr_input_device, @alignCast(@alignOf(*c.wlr_input_device), data));
+
+    // TODO: suport multiple seats
+    if (self.seats.first) |seat_node| {
+        seat_node.data.addDevice(device) catch unreachable;
+    }
+}