Implement basic xdg decoration management

1 files changed, 45 insertions, 0 deletions

diff --git a/src/decoration_manager.zig b/src/decoration_manager.zig
new file mode 100644
index 0000000..d6beb1e
--- /dev/null
+++ b/src/decoration_manager.zig
@@ -0,0 +1,45 @@
+const std = @import("std");
+const c = @import("c.zig").c;
+
+const Decoration = @import("decoration.zig").Decoration;
+const Server = @import("server.zig").Server;
+
+pub const DecorationManager = struct {
+    const Self = @This();
+
+    server: *Server,
+
+    wlr_xdg_decoration_manager: *c.wlr_xdg_decoration_manager_v1,
+
+    decorations: std.SinglyLinkedList(Decoration),
+
+    listen_new_toplevel_decoration: c.wl_listener,
+
+    pub fn init(self: *Self, server: *Server) !void {
+        self.server = server;
+        self.wlr_xdg_decoration_manager = c.wlr_xdg_decoration_manager_v1_create(server.wl_display) orelse
+            return error.CantCreateWlrXdgDecorationManager;
+
+        self.listen_new_toplevel_decoration.notify = handleNewToplevelDecoration;
+        c.wl_signal_add(
+            &self.wlr_xdg_decoration_manager.events.new_toplevel_decoration,
+            &self.listen_new_toplevel_decoration,
+        );
+    }
+
+    fn handleNewToplevelDecoration(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
+        const decoration_manager = @fieldParentPtr(
+            DecorationManager,
+            "listen_new_toplevel_decoration",
+            listener.?,
+        );
+        const wlr_xdg_toplevel_decoration = @ptrCast(
+            *c.wlr_xdg_toplevel_decoration_v1,
+            @alignCast(@alignOf(*c.wlr_xdg_toplevel_decoration_v1), data),
+        );
+
+        const node = decoration_manager.decorations.allocateNode(decoration_manager.server.allocator) catch unreachable;
+        node.data.init(decoration_manager, wlr_xdg_toplevel_decoration);
+        decoration_manager.decorations.prepend(node);
+    }
+};