╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ ui.zig ───────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭65e7953e..╮ 65e7953e.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (243) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯
.. embed/ event/ test/ ui/ command.zig event.zig lib.zig main.zig main_wasm.zig serve.zig serve_common.zig serve_http.zig serve_ssh.zig serve_ssh_protocol.zig test.zig testnet.zig try.zig ╭─────────────────────────────────╮ │ui.zig │ ╰─────────────────────────────────╯ web.zig
838 .custom => |c| c, 839 else => return null, 840 }; 841 const a_prefix = "a:"; 842 if (!std.mem.startsWith(u8, custom, a_prefix)) return null; 843 const url = custom[a_prefix.len..]; 844 const q = std.mem.indexOfScalar(u8, url, '?'); 845 const route = RoutablePage.fromUrl(if (q) |i| url[0..i] else url, if (q) |i| url[i + 1 ..] else null) orelse return null; 846 // a link to a different parent page always navigates; within a page, a 847 // files-directory / commits-page / list-window change navigates while tab 848 // links stay in-page (header-handled). 849 if (route.parent() != current.parent() or RoutablePage.repoPageChanged(route, current) or RoutablePage.homePageChanged(route, current) or RoutablePage.userPageChanged(route, current)) return route; 850 return null; 851 } 852 853 // native-TUI navigation 854 pub const Nav = struct { 855 root: Widget, 856 route: RoutablePage, 857 // backs the current page (its Page data and the page-scoped strings its 858 // widgets build). owned here, swapped on each navigation. session.page_arena 859 // tracks whichever of these is current so widgets allocate into it. 860 arena: *std.heap.ArenaAllocator, 861 history: std.ArrayList(Entry), 862 863 // each retained page keeps its own arena, freed when the page leaves the 864 // stack (popped on back, evicted at cap, or on deinit). this is what keeps a 865 // long-lived session from accumulating every page it ever visited. 866 const Entry = struct { root: Widget, route: RoutablePage, arena: *std.heap.ArenaAllocator }; 867 868 // cap on retained back-history so the chain can't grow memory without bound 869 const max_history: usize = 16; 870 871 pub fn init(allocator: std.mem.Allocator, session: *Session) !Nav { 872 const arena = try allocator.create(std.heap.ArenaAllocator); 873 arena.* = std.heap.ArenaAllocator.init(allocator); 874 errdefer { 875 arena.deinit(); 876 allocator.destroy(arena); 877 } 878 879 session.page_arena = arena; 880 const route = session.data.current_page; 881 882 const page = try arena.allocator().create(Page); 883 page.* = try Page.init(arena, session, route); 884 return .{ 885 .root = try initRoot(allocator, page, session), 886 .route = route, 887 .arena = arena, 888 .history = .empty, 889 }; 890 } 891 892 pub fn deinit(self: *Nav, allocator: std.mem.Allocator) void { 893 self.root.deinit(allocator); 894 freeArena(allocator, self.arena); 895 for (self.history.items) |*entry| { 896 entry.root.deinit(allocator); 897 freeArena(allocator, entry.arena); 898 } 899 self.history.deinit(allocator); 900 } 901 902 fn freeArena(allocator: std.mem.Allocator, arena: *std.heap.ArenaAllocator) void { 903 arena.deinit(); 904 allocator.destroy(arena); 905 } 906 907 // reconcile the displayed root with the session's navigation state. a 908 // forward nav (current_page moved to a different parent page) pushes the 909 // current root and builds the new page in a fresh arena; a back request 910 // frees the current page and restores the previous one. when escape is 911 // pressed with no history left we switch to the quit tab instead of quitting. 912 pub fn sync(self: *Nav, allocator: std.mem.Allocator, session: *Session) !void { 913 // refresh: rebuild the current page in place from a current moment 914 if (session.refresh_requested) { 915 session.refresh_requested = false; 916 if (session.haxy_moment != null) { 917 const arena = try allocator.create(std.heap.ArenaAllocator); 918 arena.* = std.heap.ArenaAllocator.init(allocator); 919 errdefer freeArena(allocator, arena); 920 921 session.page_arena = arena; 922 923 const page = try arena.allocator().create(Page); 924 page.* = try Page.init(arena, session, self.route); 925 const new_root = try initRoot(allocator, page, session); 926 927 self.root.deinit(allocator); 928 freeArena(allocator, self.arena); 929 self.root = new_root; 930 self.arena = arena; 931 } 932 return; 933 } 934 935 if (session.nav_back) { 936 session.nav_back = false; 937 if (self.history.pop()) |entry| { 938 self.root.deinit(allocator); 939 freeArena(allocator, self.arena); 940 self.root = entry.root; 941 self.route = entry.route; 942 self.arena = entry.arena; 943 session.page_arena = entry.arena; 944 session.data.current_page = entry.route; 945 return; 946 } 947 // nothing to go back to; switch to the quit confirmation 948 const root_focus = self.root.getFocus(); 949 var iter = root_focus.children.iterator(); 950 while (iter.next()) |entry| { 951 switch (entry.value_ptr.focus.kind) { 952 .custom => |custom| if (std.mem.eql(u8, custom, Quit.tab_kind)) { 953 root_focus.setFocus(entry.key_ptr.*); 954 // a Stack only builds its selected child, so the quit 955 // button isn't in the focus tree until a build runs with 956 // the quit tab selected. build once, then send a 957 // synthetic arrow_down to drop focus from the tab onto 958 // the button so it's ready to confirm. 959 try self.root.build(allocator, .{ 960 .min_size = .{ .width = null, .height = 40 }, 961 .max_size = .{ .width = 80, .height = null }, 962 }, root_focus); 963 try self.root.input(allocator, .arrow_down, root_focus); 964 break; 965 }, 966 else => {}, 967 } 968 } 969 return; 970 } 971 972 // forward navigation: navigate() set next_page to the page to move to (a 973 // cross-page link or tab change crossing pages) 974 if (session.next_page) |route| { 975 session.next_page = null; 976 if (session.haxy_moment == null) return; 977 // the page we navigated to becomes the current page 978 session.data.current_page = route; 979 980 const arena = try allocator.create(std.heap.ArenaAllocator); 981 arena.* = std.heap.ArenaAllocator.init(allocator); 982 errdefer freeArena(allocator, arena); 983 984 session.page_arena = arena; 985 986 const page = try arena.allocator().create(Page); 987 page.* = try Page.init(arena, session, route); 988 const new_root = try initRoot(allocator, page, session); 989 990 try self.history.append(allocator, .{ .root = self.root, .route = self.route, .arena = self.arena }); 991 // drop the oldest entry (freeing its widget tree and arena) once over cap 992 if (self.history.items.len > max_history) { 993 var oldest = self.history.orderedRemove(0); 994 oldest.root.deinit(allocator); 995 freeArena(allocator, oldest.arena); 996 } 997 self.root = new_root; 998 self.route = route; 999 self.arena = arena; 1000 } 1001 } 1002 }; 1003 1004 pub fn initRoot(allocator: std.mem.Allocator, page: *const Page, session: *Session) !Widget { 1005 const page_widget: Widget = switch (page.*) { 1006 .home => |*p| .{ .home = try .init(allocator, p, session) }, 1007 .user => |*p| .{ .user = try .init(allocator, p, session) }, 1008 .repo => |*p| .{ .repo = try .init(allocator, p, session) }, 1009 }; 1010 1011 const demon_art = @embedFile("embed/demon.ans"); 1012 1013 // on the TUI/SSH, the page sits above a one-row footer showing the url 1014 var root = if (session.is_terminal) blk: { 1015 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .vert }); 1016 errdefer box.deinit(allocator); 1017 const bg_id = bg_blk: { 1018 var background = try AnsiBackground.init(allocator, page_widget, demon_art, session); 1019 errdefer background.deinit(allocator); 1020 const id = background.getFocus().id; 1021 try box.children.put(allocator, id, .{ .widget = .{ .background = background }, .rect = null, .min_size = null }); 1022 break :bg_blk id; 1023 }; 1024 { 1025 var footer = try Footer.init(allocator, session); 1026 errdefer footer.deinit(allocator); 1027 try box.children.put(allocator, footer.getFocus().id, .{ .widget = .{ .footer = footer }, .rect = null, .min_size = .{ .width = null, .height = 1 } }); 1028 } 1029 box.getFocus().child_id = bg_id; 1030 break :blk Widget{ .box = box }; 1031 } else Widget{ .background = try AnsiBackground.init(allocator, page_widget, demon_art, session) }; 1032 errdefer root.deinit(allocator); 1033 1034 // input-owning views build their TextInputs in init — so reset the 1035 // focus-id -> *TextInput map here 1036 session.text_inputs.clearRetainingCapacity(); 1037 1038 try root.build(allocator, .{ 1039 .min_size = .{ .width = null, .height = 40 }, 1040 .max_size = .{ .width = 100, .height = null }, 1041 }, root.getFocus()); 1042 1043 return root; 1044 } 1045 1046 pub const Widget = union(enum) { 1047 text: wgt.Text(Widget), 1048 box: wgt.Box(Widget), 1049 text_box: wgt.TextBox(Widget), 1050 text_input: wgt.TextInput(Widget), 1051 scroll: wgt.Scroll(Widget), 1052 stack: wgt.Stack(Widget), 1053 flow_box: FlowBox, 1054 flow_box_scroll: FlowBox.Scroll, 1055 spacer: Spacer, 1056 center: Center, 1057 background: AnsiBackground, 1058 home: Home.View, 1059 user: User.View, 1060 repo: Repo.View, 1061 quit: Quit.View, 1062 title: Title.View, 1063 sub_title: SubTitle.View, 1064 home_header: Home.Header.View, 1065 user_header: User.Header.View, 1066 repo_header: Repo.Header.View, 1067 repo_sub_header: Repo.SubHeader.View, 1068 repo_files: Repo.Files.View, 1069 repo_commits: Repo.Commits.View, 1070 repo_refs: Repo.Refs.View, 1071 home_users: Home.Users.View, 1072 home_repos: Home.Repos.View, 1073 auth_tab: Home.Header.AuthTab.View, 1074 home_settings: Home.Settings.View, 1075 home_auth: Home.Auth.View, 1076 footer: Footer, 1077 1078 pub fn deinit(self: *Widget, allocator: std.mem.Allocator) void { 1079 switch (self.*) { 1080 inline else => |*case| case.deinit(allocator), 1081 } 1082 } 1083 1084 pub fn build(self: *Widget, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) anyerror!void { 1085 switch (self.*) { 1086 inline else => |*case| try case.build(allocator, constraint, root_focus), 1087 } 1088 } 1089 1090 pub fn input(self: *Widget, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) anyerror!void { 1091 switch (self.*) { 1092 inline else => |*case| try case.input(allocator, key, root_focus), 1093 } 1094 } 1095 1096 pub fn clearGrid(self: *Widget) void { 1097 switch (self.*) { 1098 inline else => |*case| case.clearGrid(), 1099 } 1100 } 1101 1102 pub fn getGrid(self: Widget) ?Grid { 1103 switch (self) { 1104 inline else => |*case| return case.getGrid(), 1105 } 1106 } 1107 1108 pub fn getFocus(self: *Widget) *Focus { 1109 switch (self.*) { 1110 inline else => |*case| return case.getFocus(), 1111 } 1112 } 1113 }; 1114 1115 // move the focused row in `box` by `delta`, clamped to the ends, scrolling 1116 // `scroll` to keep it visible. 1117 pub fn moveRowFocus(box: *wgt.Box(Widget), scroll: *wgt.Scroll(Widget), root_focus: *Focus, delta: isize) void { 1118 const keys = box.children.keys(); 1119 if (keys.len == 0) return; 1120 const cur_id = box.getFocus().child_id orelse return; 1121 const cur: isize = @intCast(box.children.getIndex(cur_id) orelse return); 1122 const last: isize = @intCast(keys.len - 1); 1123 const next: usize = @intCast(std.math.clamp(cur + delta, 0, last)); 1124 if (next == @as(usize, @intCast(cur))) return; 1125 root_focus.setFocus(keys[next]); 1126 if (box.children.values()[next].rect) |rect| scroll.scrollToRect(rect); 1127 } 1128 1129 // keep a scroll within its content, using the last build's grids. the scroll 1130 // bar's reserved column/row isn't part of the content viewport, so exclude it 1131 // (as scrollToRect does) or the last column/row stays unreachable. 1132 pub fn clampScroll(sc: *wgt.Scroll(Widget)) void { 1133 const vp = sc.grid orelse return; 1134 const content = sc.child.box.grid orelse return; 1135 const view_w = vp.size.width - sc.bar_w; 1136 const view_h = vp.size.height - sc.bar_h; 1137 const max_y: isize = if (content.size.height > view_h) @intCast(content.size.height - view_h) else 0; 1138 const max_x: isize = if (content.size.width > view_w) @intCast(content.size.width - view_w) else 0; 1139 sc.y = std.math.clamp(sc.y, 0, max_y); 1140 sc.x = std.math.clamp(sc.x, 0, max_x); 1141 } 1142 1143 pub const FlowBox = struct { 1144 focus: *Focus, 1145 grid: ?Grid, 1146 text_boxes: std.ArrayList(wgt.TextBox(Widget)), 1147 // backs the per-item strings the text boxes borrow: each box's `content` 1148 // and, for link items, its `.custom` focus kind (e.g. "a:/user/foo"). reset 1149 // wholesale on each setItems so there's no per-string ownership to track. 1150 arena: std.heap.ArenaAllocator, 1151 // column count from the last build — FlowBox.Scroll.input uses it so arrow 1152 // up/down can step by a row's worth of items. 1153 last_cols: usize, 1154 options: Options, 1155 1156 const border_rows: usize = 2; 1157 1158 pub const Options = struct { 1159 cell_width: usize = 40, 1160 cell_height: usize = 3, 1161 }; 1162 1163 pub fn init(allocator: std.mem.Allocator, options: Options) !FlowBox { 1164 return .{ 1165 .focus = try Focus.create(allocator, .container), 1166 .grid = null, 1167 .text_boxes = .empty, 1168 .arena = std.heap.ArenaAllocator.init(allocator), 1169 .last_cols = 1, 1170 .options = options, 1171 }; 1172 } 1173 1174 pub fn deinit(self: *FlowBox, allocator: std.mem.Allocator) void { 1175 self.focus.destroy(allocator); 1176 if (self.grid) |*grid| { 1177 grid.deinit(); 1178 self.grid = null; 1179 } 1180 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 1181 self.text_boxes.deinit(allocator); 1182 self.arena.deinit(); 1183 } 1184 1185 // one flow item: its display text plus an optional link. a non-empty `link` 1186 // sets the item's focus kind such as `.{ .custom = "a:/user/foo" }`, which 1187 // the web renderer turns into an anchor. 1188 pub const Item = struct { text: []const u8, link: []const u8 = "" }; 1189 1190 // both the item text and the link are copied into the arena, so the caller's 1191 // slices needn't outlive this call. 1192 pub fn setItems(self: *FlowBox, allocator: std.mem.Allocator, items: []const Item) !void { 1193 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 1194 self.text_boxes.clearAndFree(allocator); 1195 1196 // the old text boxes (and their borrowed content/links) are gone now, so 1197 // the arena that backed those strings can be reclaimed. 1198 _ = self.arena.reset(.retain_capacity); 1199 const aa = self.arena.allocator(); 1200 1201 self.focus.clear(); 1202 self.focus.child_id = null; 1203 1204 for (items) |item| { 1205 const line = try aa.dupe(u8, item.text); 1206 1207 var text_box = try wgt.TextBox(Widget).init(allocator, line, .{ .border_style = .hidden, .rounded_corners = true, .wrap_kind = .word }); 1208 errdefer text_box.deinit(allocator); 1209 text_box.getFocus().focusable = true; 1210 1211 if (item.link.len > 0) { 1212 text_box.getFocus().kind = .{ .custom = try aa.dupe(u8, item.link) }; 1213 } 1214 1215 try self.text_boxes.append(allocator, text_box); 1216 } 1217 1218 if (self.text_boxes.items.len > 0) { 1219 self.focus.child_id = self.text_boxes.items[0].getFocus().id; 1220 } 1221 } 1222 1223 pub fn build(self: *FlowBox, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1224 self.clearGrid(); 1225 self.focus.clear(); 1226 1227 const cell_width = self.options.cell_width; 1228 const max_width = constraint.max_size.width orelse cell_width; 1229 const cols = if (cell_width == 0) 1 else @max(1, max_width / cell_width); 1230 self.last_cols = cols; 1231 1232 const count = self.text_boxes.items.len; 1233 if (count == 0) return; 1234 const slot_height = self.options.cell_height + border_rows; 1235 if (slot_height == 0) return; 1236 1237 // build at the slot size so every text box fits a single grid cell 1238 for (self.text_boxes.items) |*tb| { 1239 tb.options.border_style = if (self.focus.child_id == tb.getFocus().id) .single else .hidden; 1240 try tb.build(allocator, .{ 1241 .min_size = .{ .width = cell_width, .height = null }, 1242 .max_size = .{ .width = cell_width, .height = slot_height }, 1243 }, root_focus); 1244 } 1245 1246 const rows = (count + cols - 1) / cols; 1247 const content_height = rows * slot_height; 1248 const total_width = cols * cell_width; 1249 if (total_width == 0 or content_height == 0) return; 1250 1251 var grid = try Grid.init(allocator, .{ .width = total_width, .height = content_height }); 1252 errdefer grid.deinit(); 1253 1254 for (self.text_boxes.items, 0..) |*tb, i| { 1255 const tb_grid = tb.getGrid() orelse continue; 1256 const col = i % cols; 1257 const row = i / cols; 1258 const cell_x = col * cell_width; 1259 const cell_y = row * slot_height; 1260 try self.focus.addChild(allocator, tb.getFocus(), tb_grid.size, cell_x, cell_y); 1261 try grid.drawGrid(tb_grid, cell_x, cell_y); 1262 } 1263 1264 self.grid = grid; 1265 } 1266 1267 pub fn input(self: *FlowBox, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 1268 _ = self; 1269 _ = allocator; 1270 _ = key; 1271 _ = root_focus; 1272 } 1273 1274 pub fn clearGrid(self: *FlowBox) void { 1275 if (self.grid) |*grid| { 1276 grid.deinit(); 1277 self.grid = null; 1278 } 1279 for (self.text_boxes.items) |*tb| tb.clearGrid(); 1280 } 1281 1282 pub fn getGrid(self: FlowBox) ?Grid { 1283 return self.grid; 1284 } 1285 1286 pub fn getFocus(self: *FlowBox) *Focus { 1287 return self.focus; 1288 } 1289 1290 pub fn cellRect(self: FlowBox, index: usize) ?layout.IRect { 1291 if (self.last_cols == 0 or index >= self.text_boxes.items.len) return null; 1292 const slot_height = self.options.cell_height + border_rows; 1293 const col = index % self.last_cols; 1294 const row = index / self.last_cols; 1295 return .{ 1296 .x = @intCast(col * self.options.cell_width), 1297 .y = @intCast(row * slot_height), 1298 .size = .{ .width = self.options.cell_width, .height = slot_height }, 1299 }; 1300 } 1301 1302 pub fn indexOfFocusId(self: FlowBox, focus_id: usize) ?usize { 1303 for (self.text_boxes.items, 0..) |tb, i| { 1304 if (tb.box.focus.id == focus_id) return i; 1305 } 1306 return null; 1307 } 1308 1309 pub const Scroll = struct { 1310 scroll: wgt.Scroll(Widget), 1311 1312 pub fn init(allocator: std.mem.Allocator, options: FlowBox.Options, web_native: bool) !Scroll { 1313 var layout_inner = try FlowBox.init(allocator, options); 1314 errdefer layout_inner.deinit(allocator); 1315 var scroll = try wgt.Scroll(Widget).init(allocator, .{ .flow_box = layout_inner }, .{ .direction = .vert, .web_native = web_native }); 1316 errdefer scroll.deinit(allocator); 1317 return .{ .scroll = scroll }; 1318 } 1319 1320 pub fn deinit(self: *Scroll, allocator: std.mem.Allocator) void { 1321 self.scroll.deinit(allocator); 1322 } 1323 1324 pub fn setItems(self: *Scroll, allocator: std.mem.Allocator, items: []const Item) !void { 1325 self.scroll.x = 0; 1326 self.scroll.y = 0; 1327 try self.inner().setItems(allocator, items); 1328 } 1329 1330 pub fn build(self: *Scroll, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1331 try self.scroll.build(allocator, constraint, root_focus); 1332 } 1333 1334 pub fn input(self: *Scroll, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 1335 _ = allocator; 1336 const in = self.inner(); 1337 const child_id = in.focus.child_id orelse return; 1338 const current_index = in.indexOfFocusId(child_id) orelse return; 1339 const count = in.text_boxes.items.len; 1340 if (count == 0) return; 1341 const cols = in.last_cols; 1342 const slot_height = in.options.cell_height + FlowBox.border_rows; 1343 1344 var index = current_index; 1345 switch (key) { 1346 .arrow_up => index -|= cols, 1347 .arrow_down => if (index + cols < count) { 1348 index += cols; 1349 }, 1350 .arrow_left => index -|= 1, 1351 .arrow_right => if (index + 1 < count) { 1352 index += 1; 1353 }, 1354 .home => index = 0, 1355 .end => index = count - 1, 1356 .page_up => { 1357 if (self.scroll.grid) |grid| if (slot_height > 0) { 1358 const rows_per_page = grid.size.height / slot_height; 1359 index -|= rows_per_page * cols; 1360 }; 1361 }, 1362 .page_down => { 1363 if (self.scroll.grid) |grid| if (slot_height > 0) { 1364 const rows_per_page = grid.size.height / slot_height; 1365 index = @min(index + rows_per_page * cols, count - 1); 1366 }; 1367 }, 1368 // scroll wheel moves the focused cell by a full row so the 1369 // viewport (via scrollToRect) follows in row-sized steps, 1370 // matching how a scroll wheel feels in a grid view. 1371 .mouse => |mouse| switch (mouse.action) { 1372 .scroll => |dir| switch (dir) { 1373 .up => index -|= cols, 1374 .down => if (index + cols < count) { 1375 index += cols; 1376 }, 1377 }, 1378 else => {}, 1379 }, 1380 else => {}, 1381 } 1382 1383 if (index != current_index) { 1384 root_focus.setFocus(in.text_boxes.items[index].getFocus().id); 1385 if (in.cellRect(index)) |rect| { 1386 self.scroll.scrollToRect(rect); 1387 } 1388 } 1389 } 1390 1391 pub fn clearGrid(self: *Scroll) void { 1392 self.scroll.clearGrid(); 1393 } 1394 1395 pub fn getGrid(self: Scroll) ?Grid { 1396 return self.scroll.getGrid(); 1397 } 1398 1399 pub fn getFocus(self: *Scroll) *Focus { 1400 return self.scroll.getFocus(); 1401 } 1402 1403 pub fn getSelectedIndex(self: Scroll) ?usize { 1404 const in = self.scroll.child.flow_box; 1405 const child_id = in.focus.child_id orelse return null; 1406 return in.indexOfFocusId(child_id); 1407 } 1408 1409 fn inner(self: *Scroll) *FlowBox { 1410 return &self.scroll.child.flow_box; 1411 } 1412 }; 1413 }; 1414 1415 // an invisible widget that fills the horizontal space granted by its parent. 1416 // used inside Box(horiz) with a min_size so the box reserves space for the 1417 // children that follow, pushing them to the right. 1418 pub const Spacer = struct { 1419 focus: *Focus, 1420 grid: ?Grid, 1421 1422 pub fn init(allocator: std.mem.Allocator) !Spacer { 1423 return .{ 1424 .focus = try Focus.create(allocator, .container), 1425 .grid = null, 1426 }; 1427 } 1428 1429 pub fn deinit(self: *Spacer, allocator: std.mem.Allocator) void { 1430 self.focus.destroy(allocator); 1431 if (self.grid) |*grid| { 1432 grid.deinit(); 1433 self.grid = null; 1434 } 1435 } 1436 1437 pub fn build(self: *Spacer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1438 _ = root_focus; 1439 self.clearGrid(); 1440 const width = constraint.max_size.width orelse return; 1441 if (width == 0) return; 1442 self.grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 1443 } 1444 1445 pub fn input(self: *Spacer, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 1446 _ = self; 1447 _ = allocator; 1448 _ = key; 1449 _ = root_focus; 1450 } 1451 1452 pub fn clearGrid(self: *Spacer) void { 1453 if (self.grid) |*grid| { 1454 grid.deinit(); 1455 self.grid = null; 1456 } 1457 } 1458 1459 pub fn getGrid(self: Spacer) ?Grid { 1460 return self.grid; 1461 } 1462 1463 pub fn getFocus(self: *Spacer) *Focus { 1464 return self.focus; 1465 } 1466 }; 1467 1468 // a one-row, non-focusable status bar showing the current page's url 1469 pub const Footer = struct { 1470 focus: *Focus, 1471 grid: ?Grid, 1472 session: *Session, 1473 arena: std.heap.ArenaAllocator, 1474 1475 pub fn init(allocator: std.mem.Allocator, session: *Session) !Footer { 1476 return .{ 1477 .focus = try Focus.create(allocator, .container), 1478 .grid = null, 1479 .session = session, 1480 .arena = std.heap.ArenaAllocator.init(allocator), 1481 }; 1482 } 1483 1484 pub fn deinit(self: *Footer, allocator: std.mem.Allocator) void { 1485 self.focus.destroy(allocator); 1486 if (self.grid) |*grid| grid.deinit(); 1487 self.arena.deinit(); 1488 } 1489 1490 pub fn build(self: *Footer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1491 _ = root_focus; 1492 self.clearGrid(); 1493 const width = constraint.max_size.width orelse return; 1494 if (width == 0) return; 1495 1496 _ = self.arena.reset(.retain_capacity); 1497 const aa = self.arena.allocator(); 1498 const path = self.session.data.current_page.urlAlloc(&self.arena) catch return; 1499 const text = if (self.session.web_port) |port| 1500 std.fmt.allocPrint(aa, "http://localhost:{d}{s}", .{ port, path }) catch return 1501 else 1502 path; 1503 1504 var grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 1505 errdefer grid.deinit(); 1506 var utf8 = (std.unicode.Utf8View.init(text) catch return).iterator(); 1507 var i: usize = 0; 1508 while (utf8.nextCodepointSlice()) |ch| { 1509 if (i == width) break; 1510 grid.cells.items[try grid.cells.at(.{ 0, i })].rune = ch; 1511 i += 1; 1512 } 1513 self.grid = grid; 1514 } 1515 1516 pub fn input(self: *Footer, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 1517 _ = self; 1518 _ = allocator; 1519 _ = key; 1520 _ = root_focus; 1521 } 1522 1523 pub fn clearGrid(self: *Footer) void { 1524 if (self.grid) |*grid| { 1525 grid.deinit(); 1526 self.grid = null; 1527 } 1528 } 1529 1530 pub fn getGrid(self: Footer) ?Grid { 1531 return self.grid; 1532 } 1533 1534 pub fn getFocus(self: *Footer) *Focus { 1535 return self.focus; 1536 } 1537 }; 1538 1539 // a single-child wrapper that builds the child at its natural size and 1540 // positions its grid in the middle of the area granted by the parent 1541 pub const Center = struct { 1542 focus: *Focus, 1543 grid: ?Grid, 1544 child: *Widget, 1545 1546 pub fn init(allocator: std.mem.Allocator, child_widget: Widget) !Center { 1547 const child = try allocator.create(Widget); 1548 errdefer allocator.destroy(child); 1549 child.* = child_widget; 1550 return .{ 1551 .focus = try Focus.create(allocator, .container), 1552 .grid = null, 1553 .child = child, 1554 }; 1555 } 1556 1557 pub fn deinit(self: *Center, allocator: std.mem.Allocator) void { 1558 self.focus.destroy(allocator); 1559 if (self.grid) |*grid| { 1560 grid.deinit(); 1561 self.grid = null; 1562 } 1563 self.child.deinit(allocator); 1564 allocator.destroy(self.child); 1565 } 1566 1567 pub fn build(self: *Center, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1568 self.clearGrid(); 1569 self.getFocus().clear(); 1570 1571 // build the child without forcing it to fill min_size; it sizes 1572 // itself to its content within the available max. 1573 try self.child.build(allocator, .{ 1574 .min_size = .{ .width = null, .height = null }, 1575 .max_size = constraint.max_size, 1576 }, root_focus); 1577 1578 const child_grid = self.child.getGrid() orelse return; 1579 1580 // prefer max when given; otherwise grow to max(min, child) so that 1581 // when only a min is set (e.g. the wasm path passes viewport rows 1582 // as min_height with no max), we can still vertically center while 1583 // letting taller content extend past the min. 1584 const width = if (constraint.max_size.width) |w| w else if (constraint.min_size.width) |min_w| @max(min_w, child_grid.size.width) else child_grid.size.width; 1585 const height = if (constraint.max_size.height) |h| h else if (constraint.min_size.height) |min_h| @max(min_h, child_grid.size.height) else child_grid.size.height; 1586 if (width == 0 or height == 0) return; 1587 1588 const offset_x: usize = (width -| child_grid.size.width) / 2; 1589 const offset_y: usize = (height -| child_grid.size.height) / 2; 1590 1591 var grid = try Grid.init(allocator, .{ .width = width, .height = height }); 1592 errdefer grid.deinit(); 1593 try grid.drawGrid(child_grid, offset_x, offset_y); 1594 try self.getFocus().addChild(allocator, self.child.getFocus(), child_grid.size, offset_x, offset_y); 1595 self.getFocus().child_id = self.child.getFocus().id; 1596 1597 self.grid = grid; 1598 } 1599 1600 pub fn input(self: *Center, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 1601 try self.child.input(allocator, key, root_focus); 1602 } 1603 1604 pub fn clearGrid(self: *Center) void { 1605 if (self.grid) |*grid| { 1606 grid.deinit(); 1607 self.grid = null; 1608 } 1609 self.child.clearGrid(); 1610 } 1611 1612 pub fn getGrid(self: Center) ?Grid { 1613 return self.grid; 1614 } 1615 1616 pub fn getFocus(self: *Center) *Focus { 1617 return self.focus; 1618 } 1619 }; 1620 1621 // renders truecolor ANSI art 1622 pub const AnsiArt = struct { 1623 focus: *Focus, 1624 grid: ?Grid, 1625 content: []const u8, 1626 1627 pub fn init(allocator: std.mem.Allocator, content: []const u8) !AnsiArt { 1628 return .{ 1629 .focus = try Focus.create(allocator, .container), 1630 .grid = null, 1631 .content = content, 1632 }; 1633 } 1634 1635 pub fn deinit(self: *AnsiArt, allocator: std.mem.Allocator) void { 1636 self.focus.destroy(allocator); 1637 if (self.grid) |*grid| { 1638 grid.deinit(); 1639 self.grid = null; 1640 } 1641 } 1642 1643 pub fn build(self: *AnsiArt, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1644 _ = root_focus; 1645 self.clearGrid(); 1646 1647 // parse into rows of cells, then copy into a rectangular grid 1648 var rows: std.ArrayList(std.ArrayList(Grid.Cell)) = .empty; 1649 defer { 1650 for (rows.items) |*row| row.deinit(allocator); 1651 rows.deinit(allocator); 1652 } 1653 var row: std.ArrayList(Grid.Cell) = .empty; 1654 errdefer row.deinit(allocator); 1655 1656 var style: Grid.Style = .{}; 1657 var width: usize = 0; 1658 const content = self.content; 1659 var i: usize = 0; 1660 while (i < content.len) { 1661 const byte = content[i]; 1662 if (byte == '\n') { 1663 width = @max(width, row.items.len); 1664 try rows.append(allocator, row); 1665 row = .empty; 1666 i += 1; 1667 } else if (byte == 0x1B and i + 1 < content.len and content[i + 1] == '[') { 1668 // CSI: scan to the final byte (0x40..0x7E); apply it if it's 'm' 1669 var j = i + 2; 1670 while (j < content.len and !(content[j] >= 0x40 and content[j] <= 0x7E)) j += 1; 1671 if (j >= content.len) { 1672 i = content.len; // malformed trailing escape; stop 1673 } else { 1674 if (content[j] == 'm') applySgr(&style, content[i + 2 .. j]); 1675 i = j + 1; 1676 } 1677 } else { 1678 const len = std.unicode.utf8ByteSequenceLength(byte) catch 1; 1679 const end = @min(content.len, i + len); 1680 const rune = content[i..end]; 1681 const transparent = end - i == 1 and rune[0] == ' ' and 1682 style.fg == null and style.bg == null and !style.inverted; 1683 try row.append(allocator, .{ 1684 .rune = if (transparent) null else rune, 1685 .style = style, 1686 }); 1687 i = end; 1688 } 1689 } 1690 // a trailing row with content but no closing newline 1691 if (row.items.len > 0) { 1692 width = @max(width, row.items.len); 1693 try rows.append(allocator, row); 1694 } else { 1695 row.deinit(allocator); 1696 } 1697 row = .empty; // ownership moved into rows (or freed); keep errdefer safe 1698 1699 const height = rows.items.len; 1700 if (width == 0 or height == 0) return; 1701 1702 const clamped_w = @min(width, constraint.max_size.width orelse width); 1703 const clamped_h = @min(height, constraint.max_size.height orelse height); 1704 1705 var grid = try Grid.init(allocator, .{ .width = clamped_w, .height = clamped_h }); 1706 errdefer grid.deinit(); 1707 for (rows.items[0..clamped_h], 0..) |r, y| { 1708 const n = @min(r.items.len, clamped_w); 1709 for (r.items[0..n], 0..) |cell, x| { 1710 grid.cells.items[try grid.cells.at(.{ y, x })] = cell; 1711 } 1712 } 1713 self.grid = grid; 1714 } 1715 1716 pub fn clearGrid(self: *AnsiArt) void { 1717 if (self.grid) |*grid| { 1718 grid.deinit(); 1719 self.grid = null; 1720 } 1721 } 1722 1723 pub fn getGrid(self: AnsiArt) ?Grid { 1724 return self.grid; 1725 } 1726 1727 pub fn getFocus(self: *AnsiArt) *Focus { 1728 return self.focus; 1729 } 1730 1731 fn applySgr(style: *Grid.Style, params: []const u8) void { 1732 var nums: [16]u32 = undefined; 1733 var n: usize = 0; 1734 var it = std.mem.splitScalar(u8, params, ';'); 1735 while (it.next()) |tok| { 1736 if (n >= nums.len) break; 1737 // an empty parameter (e.g. bare "\x1b[m") means 0 1738 nums[n] = std.fmt.parseInt(u32, tok, 10) catch 0; 1739 n += 1; 1740 } 1741 if (n == 0) { 1742 style.* = .{}; 1743 return; 1744 } 1745 var i: usize = 0; 1746 while (i < n) : (i += 1) { 1747 switch (nums[i]) { 1748 0 => style.* = .{}, 1749 7 => style.inverted = true, 1750 27 => style.inverted = false, 1751 39 => style.fg = null, 1752 49 => style.bg = null, 1753 38, 48 => { 1754 // truecolor form: 38;2;r;g;b — anything else is ignored 1755 if (i + 4 < n and nums[i + 1] == 2) { 1756 const c = Grid.Color{ 1757 .r = @truncate(nums[i + 2]), 1758 .g = @truncate(nums[i + 3]), 1759 .b = @truncate(nums[i + 4]), 1760 }; 1761 if (nums[i] == 38) style.fg = c else style.bg = c; 1762 i += 4; 1763 } 1764 }, 1765 else => {}, 1766 } 1767 } 1768 } 1769 }; 1770 1771 // a full-screen wrapper that renders ANSI art behind whatever page it wraps 1772 pub const AnsiBackground = struct { 1773 grid: ?Grid, 1774 child: *Widget, 1775 art: AnsiArt, 1776 session: *Session, 1777 1778 pub fn init(allocator: std.mem.Allocator, child_widget: Widget, art_content: []const u8, session: *Session) !AnsiBackground { 1779 var cw = child_widget; 1780 const child = allocator.create(Widget) catch |e| { 1781 cw.deinit(allocator); 1782 return e; 1783 }; 1784 child.* = cw; 1785 errdefer { 1786 child.deinit(allocator); 1787 allocator.destroy(child); 1788 } 1789 return .{ .grid = null, .child = child, .art = try AnsiArt.init(allocator, art_content), .session = session }; 1790 } 1791 1792 pub fn deinit(self: *AnsiBackground, allocator: std.mem.Allocator) void { 1793 if (self.grid) |*grid| grid.deinit(); 1794 self.art.deinit(allocator); 1795 self.child.deinit(allocator); 1796 allocator.destroy(self.child); 1797 } 1798 1799 pub fn build(self: *AnsiBackground, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1800 self.clearGrid(); 1801 1802 // make the wrapped page fill the whole available area 1803 try self.child.build(allocator, .{ 1804 .min_size = .{ 1805 .width = constraint.max_size.width orelse constraint.min_size.width, 1806 .height = constraint.max_size.height orelse constraint.min_size.height, 1807 }, 1808 .max_size = constraint.max_size, 1809 }, root_focus); 1810 1811 if (self.session.data.enable_ansi) { 1812 if (self.child.getGrid()) |fg| { 1813 self.grid = try artBehind(allocator, fg, &self.art, .top_right, root_focus); 1814 } 1815 } 1816 } 1817 1818 pub fn input(self: *AnsiBackground, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 1819 try self.child.input(allocator, key, root_focus); 1820 } 1821 1822 pub fn clearGrid(self: *AnsiBackground) void { 1823 if (self.grid) |*grid| { 1824 grid.deinit(); 1825 self.grid = null; 1826 } 1827 self.child.clearGrid(); 1828 self.art.clearGrid(); 1829 } 1830 1831 pub fn getGrid(self: AnsiBackground) ?Grid { 1832 return self.grid orelse self.child.getGrid(); 1833 } 1834 1835 pub fn getFocus(self: *AnsiBackground) *Focus { 1836 return self.child.getFocus(); 1837 } 1838 1839 // which top corner the art hugs. 1840 const ArtAnchor = enum { top_left, top_right }; 1841 1842 // a foreground cell counts as blank if it's empty or a bare space without styling 1843 fn cellIsBlank(cell: Grid.Cell) bool { 1844 if (cell.rune) |rune| { 1845 return std.mem.eql(u8, rune, " ") and 1846 cell.style.fg == null and cell.style.bg == null and !cell.style.inverted; 1847 } 1848 return true; 1849 } 1850 1851 // the art is dimmed to this fraction of its brightness so foreground text 1852 // stays legible over it 1853 const art_brightness = 45; // percent 1854 1855 fn dimColor(color: ?Grid.Color) ?Grid.Color { 1856 const c = color orelse return null; 1857 return .{ 1858 .r = @intCast(@as(u16, c.r) * art_brightness / 100), 1859 .g = @intCast(@as(u16, c.g) * art_brightness / 100), 1860 .b = @intCast(@as(u16, c.b) * art_brightness / 100), 1861 }; 1862 } 1863 1864 // terminals that don't support truecolor misparse a "38;2;r;g;b"/"48;2;…" 1865 // SGR as a list of plain SGR codes, so any channel value in 1..9 turns on 1866 // a text attribute (5/6 = blink, 7 = inverse, 8 = conceal, …). 1867 // snap such channels clear of that range so the backdrop doesn't blink or 1868 // hide text there; the ≤9/255 shift is imperceptible on terminals that 1869 // actually render truecolor. 1870 fn sgrSafe(color: ?Grid.Color) ?Grid.Color { 1871 const c = color orelse return null; 1872 const snap = struct { 1873 fn f(v: u8) u8 { 1874 return if (v >= 1 and v <= 9) 10 else v; 1875 } 1876 }.f; 1877 return .{ .r = snap(c.r), .g = snap(c.g), .b = snap(c.b) }; 1878 } 1879 1880 // composites ANSI art behind a foreground grid 1881 fn artBehind(allocator: std.mem.Allocator, foreground: Grid, art: *AnsiArt, anchor: ArtAnchor, root_focus: *Focus) !Grid { 1882 art.clearGrid(); 1883 try art.build(allocator, .{ 1884 .min_size = .{ .width = null, .height = null }, 1885 .max_size = .{ .width = foreground.size.width, .height = foreground.size.height }, 1886 }, root_focus); 1887 1888 var out = try Grid.initFromGrid(allocator, foreground, foreground.size, 0, 0); 1889 errdefer out.deinit(); 1890 1891 if (art.getGrid()) |art_grid| { 1892 const anchor_x = switch (anchor) { 1893 .top_left => 0, 1894 .top_right => foreground.size.width -| art_grid.size.width, 1895 }; 1896 for (0..art_grid.size.height) |y| { 1897 for (0..art_grid.size.width) |x| { 1898 const src = art_grid.cells.items[try art_grid.cells.at(.{ y, x })]; 1899 if (src.rune == null) continue; 1900 const idx = out.cells.at(.{ y, anchor_x + x }) catch continue; 1901 const dst = &out.cells.items[idx]; 1902 // composite the dimmed art behind every cell so it shows 1903 // through the whole UI: a blank cell becomes the art, while a 1904 // cell with a glyph keeps the glyph but takes the dimmed art as 1905 // its background (replacing whatever background it had, which 1906 // would otherwise obscure the art). 1907 if (cellIsBlank(dst.*)) { 1908 dst.* = src; 1909 dst.style.fg = sgrSafe(dimColor(dst.style.fg)); 1910 dst.style.bg = sgrSafe(dimColor(dst.style.bg)); 1911 } else { 1912 dst.style.bg = sgrSafe(dimColor(src.style.bg orelse src.style.fg)); 1913 } 1914 } 1915 } 1916 } 1917 return out; 1918 } 1919 }; 1920