╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ ui.zig ───────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭315e390b..╮ 315e390b.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (402) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯
.. embed/ event/ test/ ui/ command.zig diff3.zig event.zig fork.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
2014 try self.text_boxes.append(allocator, text_box); 2015 } 2016 2017 if (self.text_boxes.items.len > 0) { 2018 self.focus.child_id = self.text_boxes.items[0].getFocus().id; 2019 } 2020 } 2021 2022 pub fn build(self: *FlowBox, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2023 self.clearGrid(); 2024 self.focus.clear(); 2025 2026 const cell_width = self.options.cell_width; 2027 const max_width = constraint.max_size.width orelse cell_width; 2028 const cols = if (cell_width == 0) 1 else @max(1, max_width / cell_width); 2029 self.last_cols = cols; 2030 2031 const count = self.text_boxes.items.len; 2032 if (count == 0) return; 2033 const slot_height = self.options.cell_height + border_rows; 2034 if (slot_height == 0) return; 2035 2036 // build at the slot size so every text box fits a single grid cell 2037 for (self.text_boxes.items) |*tb| { 2038 tb.options.border_style = if (self.focus.child_id == tb.getFocus().id) .single else .hidden; 2039 try tb.build(allocator, .{ 2040 .min_size = .{ .width = cell_width, .height = null }, 2041 .max_size = .{ .width = cell_width, .height = slot_height }, 2042 }, root_focus); 2043 } 2044 2045 const rows = (count + cols - 1) / cols; 2046 const content_height = rows * slot_height; 2047 const total_width = cols * cell_width; 2048 if (total_width == 0 or content_height == 0) return; 2049 2050 var grid = try Grid.init(allocator, .{ .width = total_width, .height = content_height }); 2051 errdefer grid.deinit(); 2052 2053 for (self.text_boxes.items, 0..) |*tb, i| { 2054 const tb_grid = tb.getGrid() orelse continue; 2055 const col = i % cols; 2056 const row = i / cols; 2057 const cell_x = col * cell_width; 2058 const cell_y = row * slot_height; 2059 try self.focus.addChild(allocator, tb.getFocus(), tb_grid.size, cell_x, cell_y); 2060 try grid.drawGrid(tb_grid, cell_x, cell_y); 2061 } 2062 2063 self.grid = grid; 2064 } 2065 2066 pub fn input(self: *FlowBox, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2067 _ = self; 2068 _ = allocator; 2069 _ = key; 2070 _ = root_focus; 2071 } 2072 2073 pub fn clearGrid(self: *FlowBox) void { 2074 if (self.grid) |*grid| { 2075 grid.deinit(); 2076 self.grid = null; 2077 } 2078 for (self.text_boxes.items) |*tb| tb.clearGrid(); 2079 } 2080 2081 pub fn getGrid(self: FlowBox) ?Grid { 2082 return self.grid; 2083 } 2084 2085 pub fn getFocus(self: *FlowBox) *Focus { 2086 return self.focus; 2087 } 2088 2089 pub fn cellRect(self: FlowBox, index: usize) ?layout.IRect { 2090 if (self.last_cols == 0 or index >= self.text_boxes.items.len) return null; 2091 const slot_height = self.options.cell_height + border_rows; 2092 const col = index % self.last_cols; 2093 const row = index / self.last_cols; 2094 return .{ 2095 .x = @intCast(col * self.options.cell_width), 2096 .y = @intCast(row * slot_height), 2097 .size = .{ .width = self.options.cell_width, .height = slot_height }, 2098 }; 2099 } 2100 2101 pub fn indexOfFocusId(self: FlowBox, focus_id: usize) ?usize { 2102 for (self.text_boxes.items, 0..) |tb, i| { 2103 if (tb.box.focus.id == focus_id) return i; 2104 } 2105 return null; 2106 } 2107 2108 pub const Scroll = struct { 2109 scroll: wgt.Scroll(Widget), 2110 2111 pub fn init(allocator: std.mem.Allocator, options: FlowBox.Options, web_native: bool) !Scroll { 2112 var layout_inner = try FlowBox.init(allocator, options); 2113 errdefer layout_inner.deinit(allocator); 2114 var scroll = try wgt.Scroll(Widget).init(allocator, .{ .flow_box = layout_inner }, .{ .direction = .vert, .web_native = web_native }); 2115 errdefer scroll.deinit(allocator); 2116 return .{ .scroll = scroll }; 2117 } 2118 2119 pub fn deinit(self: *Scroll, allocator: std.mem.Allocator) void { 2120 self.scroll.deinit(allocator); 2121 } 2122 2123 pub fn setItems(self: *Scroll, allocator: std.mem.Allocator, items: []const Item) !void { 2124 self.scroll.x = 0; 2125 self.scroll.y = 0; 2126 try self.inner().setItems(allocator, items); 2127 } 2128 2129 pub fn build(self: *Scroll, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2130 try self.scroll.build(allocator, constraint, root_focus); 2131 } 2132 2133 pub fn input(self: *Scroll, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2134 _ = allocator; 2135 const in = self.inner(); 2136 const child_id = in.focus.child_id orelse return; 2137 const current_index = in.indexOfFocusId(child_id) orelse return; 2138 const count = in.text_boxes.items.len; 2139 if (count == 0) return; 2140 const cols = in.last_cols; 2141 const slot_height = in.options.cell_height + FlowBox.border_rows; 2142 2143 var index = current_index; 2144 switch (key) { 2145 .arrow_up => index -|= cols, 2146 .arrow_down => if (index + cols < count) { 2147 index += cols; 2148 }, 2149 .arrow_left => index -|= 1, 2150 .arrow_right => if (index + 1 < count) { 2151 index += 1; 2152 }, 2153 .home => index = 0, 2154 .end => index = count - 1, 2155 .page_up => { 2156 if (self.scroll.grid) |grid| if (slot_height > 0) { 2157 const rows_per_page = grid.size.height / slot_height; 2158 index -|= rows_per_page * cols; 2159 }; 2160 }, 2161 .page_down => { 2162 if (self.scroll.grid) |grid| if (slot_height > 0) { 2163 const rows_per_page = grid.size.height / slot_height; 2164 index = @min(index + rows_per_page * cols, count - 1); 2165 }; 2166 }, 2167 // scroll wheel moves the focused cell by a full row so the 2168 // viewport (via scrollToRect) follows in row-sized steps, 2169 // matching how a scroll wheel feels in a grid view. 2170 .mouse => |mouse| switch (mouse.action) { 2171 .scroll => |dir| switch (dir) { 2172 .up => index -|= cols, 2173 .down => if (index + cols < count) { 2174 index += cols; 2175 }, 2176 }, 2177 else => {}, 2178 }, 2179 else => {}, 2180 } 2181 2182 if (index != current_index) { 2183 root_focus.setFocus(in.text_boxes.items[index].getFocus().id); 2184 if (in.cellRect(index)) |rect| { 2185 self.scroll.scrollToRect(rect); 2186 } 2187 } 2188 } 2189 2190 pub fn clearGrid(self: *Scroll) void { 2191 self.scroll.clearGrid(); 2192 } 2193 2194 pub fn getGrid(self: Scroll) ?Grid { 2195 return self.scroll.getGrid(); 2196 } 2197 2198 pub fn getFocus(self: *Scroll) *Focus { 2199 return self.scroll.getFocus(); 2200 } 2201 2202 pub fn getSelectedIndex(self: Scroll) ?usize { 2203 const in = self.scroll.child.flow_box; 2204 const child_id = in.focus.child_id orelse return null; 2205 return in.indexOfFocusId(child_id); 2206 } 2207 2208 fn inner(self: *Scroll) *FlowBox { 2209 return &self.scroll.child.flow_box; 2210 } 2211 }; 2212 }; 2213 2214 // a left-to-right flow of variable-width focusable items that wraps at the 2215 // available width, like words in a paragraph. unlike FlowBox there is no cell 2216 // grid: each item is as wide as its text. selection movement is driven by the 2217 // owning view via indexOfFocusId/verticalNeighbor. 2218 pub const TagFlow = struct { 2219 focus: *Focus, 2220 grid: ?Grid, 2221 text_boxes: std.ArrayList(wgt.TextBox(Widget)), 2222 // last build's item rects (content space), for vertical navigation and 2223 // scroll-into-view. 2224 rects: std.ArrayList(layout.IRect), 2225 // backs each link item's `.custom` focus kind. 2226 arena: std.heap.ArenaAllocator, 2227 2228 pub const Item = struct { text: []const u8, link: []const u8 = "" }; 2229 2230 pub fn init(allocator: std.mem.Allocator) !TagFlow { 2231 return .{ 2232 .focus = try Focus.create(allocator, .container), 2233 .grid = null, 2234 .text_boxes = .empty, 2235 .rects = .empty, 2236 .arena = std.heap.ArenaAllocator.init(allocator), 2237 }; 2238 } 2239 2240 pub fn deinit(self: *TagFlow, allocator: std.mem.Allocator) void { 2241 self.focus.destroy(allocator); 2242 if (self.grid) |*grid| { 2243 grid.deinit(); 2244 self.grid = null; 2245 } 2246 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 2247 self.text_boxes.deinit(allocator); 2248 self.rects.deinit(allocator); 2249 self.arena.deinit(); 2250 } 2251 2252 // the text box copies the item text; links are copied into the arena, so the 2253 // caller's slices needn't outlive this call. 2254 pub fn setItems(self: *TagFlow, allocator: std.mem.Allocator, items: []const Item) !void { 2255 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 2256 self.text_boxes.clearAndFree(allocator); 2257 2258 _ = self.arena.reset(.retain_capacity); 2259 const aa = self.arena.allocator(); 2260 2261 self.focus.clear(); 2262 self.focus.child_id = null; 2263 2264 for (items) |item| { 2265 var text_box = try wgt.TextBox(Widget).init(allocator, item.text, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2266 errdefer text_box.deinit(allocator); 2267 text_box.getFocus().focusable = true; 2268 2269 if (item.link.len > 0) { 2270 text_box.getFocus().kind = .{ .custom = try aa.dupe(u8, item.link) }; 2271 } 2272 2273 try self.text_boxes.append(allocator, text_box); 2274 } 2275 2276 if (self.text_boxes.items.len > 0) { 2277 self.focus.child_id = self.text_boxes.items[0].getFocus().id; 2278 } 2279 } 2280 2281 pub fn build(self: *TagFlow, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2282 self.clearGrid(); 2283 self.focus.clear(); 2284 2285 if (self.text_boxes.items.len == 0) return; 2286 const max_width = constraint.max_size.width orelse 80; 2287 if (max_width == 0) return; 2288 2289 // lay the items out left to right, wrapping to a new row when the next 2290 // one wouldn't fit. 2291 self.rects.clearRetainingCapacity(); 2292 var x: usize = 0; 2293 var y: usize = 0; 2294 var row_height: usize = 0; 2295 var total_width: usize = 0; 2296 for (self.text_boxes.items) |*tb| { 2297 try tb.build(allocator, .{ 2298 .min_size = .{ .width = null, .height = null }, 2299 .max_size = .{ .width = max_width, .height = null }, 2300 }, root_focus); 2301 const tb_grid_maybe = tb.getGrid(); 2302 const w: usize = if (tb_grid_maybe) |g| g.size.width else 0; 2303 const h: usize = if (tb_grid_maybe) |g| g.size.height else 0; 2304 if (x > 0 and x + w > max_width) { 2305 x = 0; 2306 y += row_height; 2307 row_height = 0; 2308 } 2309 try self.rects.append(allocator, .{ .x = @intCast(x), .y = @intCast(y), .size = .{ .width = w, .height = h } }); 2310 if (h > row_height) row_height = h; 2311 x += w; 2312 if (x > total_width) total_width = x; 2313 } 2314 2315 const total_height = y + row_height; 2316 if (total_width == 0 or total_height == 0) return; 2317 2318 var grid = try Grid.init(allocator, .{ .width = total_width, .height = total_height }); 2319 errdefer grid.deinit(); 2320 2321 for (self.text_boxes.items, self.rects.items) |*tb, rect| { 2322 const tb_grid = tb.getGrid() orelse continue; 2323 try self.focus.addChild(allocator, tb.getFocus(), tb_grid.size, @intCast(rect.x), @intCast(rect.y)); 2324 try grid.drawGrid(tb_grid, @intCast(rect.x), @intCast(rect.y)); 2325 } 2326 2327 self.grid = grid; 2328 } 2329 2330 pub fn input(self: *TagFlow, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2331 _ = self; 2332 _ = allocator; 2333 _ = key; 2334 _ = root_focus; 2335 } 2336 2337 pub fn clearGrid(self: *TagFlow) void { 2338 if (self.grid) |*grid| { 2339 grid.deinit(); 2340 self.grid = null; 2341 } 2342 for (self.text_boxes.items) |*tb| tb.clearGrid(); 2343 } 2344 2345 pub fn getGrid(self: TagFlow) ?Grid { 2346 return self.grid; 2347 } 2348 2349 pub fn getFocus(self: *TagFlow) *Focus { 2350 return self.focus; 2351 } 2352 2353 pub fn indexOfFocusId(self: TagFlow, focus_id: usize) ?usize { 2354 for (self.text_boxes.items, 0..) |tb, i| { 2355 if (tb.box.focus.id == focus_id) return i; 2356 } 2357 return null; 2358 } 2359 2360 // the first item of the row below (when `downward`) or above, or null at 2361 // the flow's edge. items are laid out in order, so y is nondecreasing. 2362 pub fn rowStep(self: TagFlow, index: usize, downward: bool) ?usize { 2363 const rects = self.rects.items; 2364 if (index >= rects.len) return null; 2365 const cur_y = rects[index].y; 2366 if (downward) { 2367 for (rects[index + 1 ..], index + 1..) |r, i| { 2368 if (r.y > cur_y) return i; 2369 } 2370 return null; 2371 } 2372 // walk the earlier rows; the last one visited is the row above. 2373 var prev_first: ?usize = null; 2374 var i: usize = 0; 2375 while (i < rects.len and rects[i].y < cur_y) { 2376 prev_first = i; 2377 const y = rects[i].y; 2378 while (i < rects.len and rects[i].y == y) i += 1; 2379 } 2380 return prev_first; 2381 } 2382 }; 2383 2384 // an invisible widget that fills the horizontal space granted by its parent. 2385 // used inside Box(horiz) with a min_size so the box reserves space for the 2386 // children that follow, pushing them to the right. 2387 pub const Spacer = struct { 2388 focus: *Focus, 2389 grid: ?Grid, 2390 2391 pub fn init(allocator: std.mem.Allocator) !Spacer { 2392 return .{ 2393 .focus = try Focus.create(allocator, .container), 2394 .grid = null, 2395 }; 2396 } 2397 2398 pub fn deinit(self: *Spacer, allocator: std.mem.Allocator) void { 2399 self.focus.destroy(allocator); 2400 if (self.grid) |*grid| { 2401 grid.deinit(); 2402 self.grid = null; 2403 } 2404 } 2405 2406 pub fn build(self: *Spacer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2407 _ = root_focus; 2408 self.clearGrid(); 2409 const width = constraint.max_size.width orelse return; 2410 if (width == 0) return; 2411 self.grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 2412 } 2413 2414 pub fn input(self: *Spacer, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2415 _ = self; 2416 _ = allocator; 2417 _ = key; 2418 _ = root_focus; 2419 } 2420 2421 pub fn clearGrid(self: *Spacer) void { 2422 if (self.grid) |*grid| { 2423 grid.deinit(); 2424 self.grid = null; 2425 } 2426 } 2427 2428 pub fn getGrid(self: Spacer) ?Grid { 2429 return self.grid; 2430 } 2431 2432 pub fn getFocus(self: *Spacer) *Focus { 2433 return self.focus; 2434 } 2435 }; 2436 2437 // a one-row, non-focusable status bar showing the current page's url 2438 pub const Footer = struct { 2439 focus: *Focus, 2440 grid: ?Grid, 2441 session: *Session, 2442 arena: std.heap.ArenaAllocator, 2443 url: []const u8 = "", 2444 url_width: usize = 0, 2445 2446 pub fn init(allocator: std.mem.Allocator, session: *Session) !Footer { 2447 return .{ 2448 .focus = try Focus.create(allocator, .container), 2449 .grid = null, 2450 .session = session, 2451 .arena = std.heap.ArenaAllocator.init(allocator), 2452 }; 2453 } 2454 2455 pub fn deinit(self: *Footer, allocator: std.mem.Allocator) void { 2456 self.focus.destroy(allocator); 2457 if (self.grid) |*grid| grid.deinit(); 2458 self.arena.deinit(); 2459 } 2460 2461 pub fn build(self: *Footer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2462 _ = root_focus; 2463 self.clearGrid(); 2464 const width = constraint.max_size.width orelse return; 2465 if (width == 0) return; 2466 2467 _ = self.arena.reset(.retain_capacity); 2468 self.url = ""; 2469 self.url_width = 0; 2470 const aa = self.arena.allocator(); 2471 const path = self.session.data.current_page.toUrl(&self.arena) catch return; 2472 const text = terminalWebUrl(aa, self.session, path) catch return; 2473 self.url = text; 2474 2475 var grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 2476 errdefer grid.deinit(); 2477 var utf8 = (std.unicode.Utf8View.init(text) catch return).iterator(); 2478 var i: usize = 0; 2479 while (utf8.nextCodepointSlice()) |ch| { 2480 if (i == width) break; 2481 grid.cells.items[try grid.cells.at(.{ 0, i })].rune = ch; 2482 i += 1; 2483 } 2484 self.url_width = i; 2485 self.grid = grid; 2486 } 2487 2488 pub fn input(self: *Footer, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2489 _ = allocator; 2490 switch (key) { 2491 .mouse => |mouse| { 2492 if (mouse.ctrl or !inp.leftClickOn(root_focus, self.getFocus().id, mouse)) return; 2493 const rect = (root_focus.children.get(self.getFocus().id) orelse return).rect; 2494 if (mouse.x < rect.x + self.url_width) self.session.host_request = .{ .show_copyable_text = self.url }; 2495 }, 2496 else => {}, 2497 } 2498 } 2499 2500 pub fn clearGrid(self: *Footer) void { 2501 if (self.grid) |*grid| { 2502 grid.deinit(); 2503 self.grid = null; 2504 } 2505 } 2506 2507 pub fn getGrid(self: Footer) ?Grid { 2508 return self.grid; 2509 } 2510 2511 pub fn getFocus(self: *Footer) *Focus { 2512 return self.focus; 2513 } 2514 }; 2515 2516 // a single-child wrapper that builds the child at its natural size and 2517 // positions its grid in the middle of the area granted by the parent 2518 // a bordered label, indented past the content it precedes 2519 pub const SectionLabel = struct { 2520 box: wgt.Box(Widget), 2521 2522 pub fn init(allocator: std.mem.Allocator, content: []const u8) !SectionLabel { 2523 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .horiz }); 2524 errdefer box.deinit(allocator); 2525 2526 { 2527 var gap = try wgt.Text(Widget).init(allocator, " "); 2528 errdefer gap.deinit(allocator); 2529 try box.children.put(allocator, gap.getFocus().id, .{ .widget = .{ .text = gap }, .rect = null, .min_size = null }); 2530 } 2531 2532 { 2533 var tb = try wgt.TextBox(Widget).init(allocator, content, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2534 errdefer tb.deinit(allocator); 2535 tb.getFocus().focusable = true; 2536 try box.children.put(allocator, tb.getFocus().id, .{ .widget = .{ .text_box = tb }, .rect = null, .min_size = null }); 2537 } 2538 2539 box.getFocus().child_id = box.children.keys()[1]; 2540 return .{ .box = box }; 2541 } 2542 2543 pub fn deinit(self: *SectionLabel, allocator: std.mem.Allocator) void { 2544 self.box.deinit(allocator); 2545 } 2546 2547 pub fn build(self: *SectionLabel, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2548 try self.box.build(allocator, constraint, root_focus); 2549 } 2550 2551 pub fn input(self: *SectionLabel, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2552 _ = self; 2553 _ = allocator; 2554 _ = key; 2555 _ = root_focus; 2556 } 2557 2558 pub fn clearGrid(self: *SectionLabel) void { 2559 self.box.clearGrid(); 2560 } 2561 2562 pub fn getGrid(self: SectionLabel) ?Grid { 2563 return self.box.getGrid(); 2564 } 2565 2566 pub fn getFocus(self: *SectionLabel) *Focus { 2567 return self.box.getFocus(); 2568 } 2569 }; 2570 2571 // a submit button, indented past its form's content. the web overlay POSTs 2572 // the button's form; terminal hosts detect presses through `buttonId`. 2573 pub const SubmitButton = struct { 2574 box: wgt.Box(Widget), 2575 2576 pub fn init(allocator: std.mem.Allocator) !SubmitButton { 2577 return initLabeled(allocator, "submit"); 2578 } 2579 2580 pub fn initLabeled(allocator: std.mem.Allocator, label: []const u8) !SubmitButton { 2581 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .horiz }); 2582 errdefer box.deinit(allocator); 2583 2584 { 2585 var gap = try wgt.Text(Widget).init(allocator, " "); 2586 errdefer gap.deinit(allocator); 2587 try box.children.put(allocator, gap.getFocus().id, .{ .widget = .{ .text = gap }, .rect = null, .min_size = null }); 2588 } 2589 2590 { 2591 var button = try wgt.TextBox(Widget).init(allocator, label, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2592 errdefer button.deinit(allocator); 2593 button.getFocus().focusable = true; 2594 // the renderer distinguishes plain clickables from buttons that 2595 // should POST to a server route by this kind. 2596 button.getFocus().kind = .{ .custom = "submit" }; 2597 try box.children.put(allocator, button.getFocus().id, .{ .widget = .{ .text_box = button }, .rect = null, .min_size = .{ .width = label.len + 2, .height = null } }); 2598 } 2599 2600 box.getFocus().child_id = box.children.keys()[1]; 2601 return .{ .box = box }; 2602 } 2603 2604 pub fn deinit(self: *SubmitButton, allocator: std.mem.Allocator) void { 2605 self.box.deinit(allocator); 2606 } 2607 2608 pub fn build(self: *SubmitButton, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2609 try self.box.build(allocator, constraint, root_focus); 2610 } 2611 2612 pub fn input(self: *SubmitButton, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2613 _ = self; 2614 _ = allocator; 2615 _ = key; 2616 _ = root_focus; 2617 } 2618 2619 pub fn clearGrid(self: *SubmitButton) void { 2620 self.box.clearGrid(); 2621 } 2622 2623 pub fn getGrid(self: SubmitButton) ?Grid { 2624 return self.box.getGrid(); 2625 } 2626 2627 pub fn getFocus(self: *SubmitButton) *Focus { 2628 return self.box.getFocus(); 2629 } 2630 2631 // the button's focus id, for click hit-testing 2632 pub fn buttonId(self: *const SubmitButton) usize { 2633 return self.box.children.keys()[1]; 2634 } 2635 }; 2636 2637 pub const Center = struct { 2638 focus: *Focus, 2639 grid: ?Grid, 2640 child: *Widget, 2641 2642 pub fn init(allocator: std.mem.Allocator, child_widget: Widget) !Center { 2643 const child = try allocator.create(Widget); 2644 errdefer allocator.destroy(child); 2645 child.* = child_widget; 2646 return .{ 2647 .focus = try Focus.create(allocator, .container), 2648 .grid = null, 2649 .child = child, 2650 }; 2651 } 2652 2653 pub fn deinit(self: *Center, allocator: std.mem.Allocator) void { 2654 self.focus.destroy(allocator); 2655 if (self.grid) |*grid| { 2656 grid.deinit(); 2657 self.grid = null; 2658 } 2659 self.child.deinit(allocator); 2660 allocator.destroy(self.child); 2661 } 2662 2663 pub fn build(self: *Center, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2664 self.clearGrid(); 2665 self.getFocus().clear(); 2666 2667 // build the child without forcing it to fill min_size; it sizes 2668 // itself to its content within the available max. 2669 try self.child.build(allocator, .{ 2670 .min_size = .{ .width = null, .height = null }, 2671 .max_size = constraint.max_size, 2672 }, root_focus); 2673 2674 const child_grid = self.child.getGrid() orelse return; 2675 2676 // prefer max when given; otherwise grow to max(min, child) so that 2677 // when only a min is set (e.g. the wasm path passes viewport rows 2678 // as min_height with no max), we can still vertically center while 2679 // letting taller content extend past the min. 2680 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; 2681 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; 2682 if (width == 0 or height == 0) return; 2683 2684 const offset_x: usize = (width -| child_grid.size.width) / 2; 2685 const offset_y: usize = (height -| child_grid.size.height) / 2; 2686 2687 var grid = try Grid.init(allocator, .{ .width = width, .height = height }); 2688 errdefer grid.deinit(); 2689 try grid.drawGrid(child_grid, offset_x, offset_y); 2690 try self.getFocus().addChild(allocator, self.child.getFocus(), child_grid.size, offset_x, offset_y); 2691 self.getFocus().child_id = self.child.getFocus().id; 2692 2693 self.grid = grid; 2694 } 2695 2696 pub fn input(self: *Center, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2697 try self.child.input(allocator, key, root_focus); 2698 } 2699 2700 pub fn clearGrid(self: *Center) void { 2701 if (self.grid) |*grid| { 2702 grid.deinit(); 2703 self.grid = null; 2704 } 2705 self.child.clearGrid(); 2706 } 2707 2708 pub fn getGrid(self: Center) ?Grid { 2709 return self.grid; 2710 } 2711 2712 pub fn getFocus(self: *Center) *Focus { 2713 return self.focus; 2714 } 2715 }; 2716 2717 // renders truecolor ANSI art 2718 pub const AnsiArt = struct { 2719 focus: *Focus, 2720 grid: ?Grid, 2721 content: []const u8, 2722 2723 pub fn init(allocator: std.mem.Allocator, content: []const u8) !AnsiArt { 2724 return .{ 2725 .focus = try Focus.create(allocator, .container), 2726 .grid = null, 2727 .content = content, 2728 }; 2729 } 2730 2731 pub fn deinit(self: *AnsiArt, allocator: std.mem.Allocator) void { 2732 self.focus.destroy(allocator); 2733 if (self.grid) |*grid| { 2734 grid.deinit(); 2735 self.grid = null; 2736 } 2737 } 2738 2739 pub fn build(self: *AnsiArt, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2740 _ = root_focus; 2741 self.clearGrid(); 2742 2743 // parse into rows of cells, then copy into a rectangular grid 2744 var rows: std.ArrayList(std.ArrayList(Grid.Cell)) = .empty; 2745 defer { 2746 for (rows.items) |*row| row.deinit(allocator); 2747 rows.deinit(allocator); 2748 } 2749 var row: std.ArrayList(Grid.Cell) = .empty; 2750 errdefer row.deinit(allocator); 2751 2752 var style: Grid.Style = .{}; 2753 var width: usize = 0; 2754 const content = self.content; 2755 var i: usize = 0; 2756 while (i < content.len) { 2757 const byte = content[i]; 2758 if (byte == '\n') { 2759 width = @max(width, row.items.len); 2760 try rows.append(allocator, row); 2761 row = .empty; 2762 i += 1; 2763 } else if (byte == 0x1B and i + 1 < content.len and content[i + 1] == '[') { 2764 // CSI: scan to the final byte (0x40..0x7E); apply it if it's 'm' 2765 var j = i + 2; 2766 while (j < content.len and !(content[j] >= 0x40 and content[j] <= 0x7E)) j += 1; 2767 if (j >= content.len) { 2768 i = content.len; // malformed trailing escape; stop 2769 } else { 2770 if (content[j] == 'm') applySgr(&style, content[i + 2 .. j]); 2771 i = j + 1; 2772 } 2773 } else { 2774 const len = std.unicode.utf8ByteSequenceLength(byte) catch 1; 2775 const end = @min(content.len, i + len); 2776 const rune = content[i..end]; 2777 const transparent = end - i == 1 and rune[0] == ' ' and 2778 style.fg == null and style.bg == null and !style.inverted; 2779 try row.append(allocator, .{ 2780 .rune = if (transparent) null else rune, 2781 .style = style, 2782 }); 2783 i = end; 2784 } 2785 } 2786 // a trailing row with content but no closing newline 2787 if (row.items.len > 0) { 2788 width = @max(width, row.items.len); 2789 try rows.append(allocator, row); 2790 } else { 2791 row.deinit(allocator); 2792 } 2793 row = .empty; // ownership moved into rows (or freed); keep errdefer safe 2794 2795 const height = rows.items.len; 2796 if (width == 0 or height == 0) return; 2797 2798 const clamped_w = @min(width, constraint.max_size.width orelse width); 2799 const clamped_h = @min(height, constraint.max_size.height orelse height); 2800 2801 var grid = try Grid.init(allocator, .{ .width = clamped_w, .height = clamped_h }); 2802 errdefer grid.deinit(); 2803 for (rows.items[0..clamped_h], 0..) |r, y| { 2804 const n = @min(r.items.len, clamped_w); 2805 for (r.items[0..n], 0..) |cell, x| { 2806 grid.cells.items[try grid.cells.at(.{ y, x })] = cell; 2807 } 2808 } 2809 self.grid = grid; 2810 } 2811 2812 pub fn clearGrid(self: *AnsiArt) void { 2813 if (self.grid) |*grid| { 2814 grid.deinit(); 2815 self.grid = null; 2816 } 2817 } 2818 2819 pub fn getGrid(self: AnsiArt) ?Grid { 2820 return self.grid; 2821 } 2822 2823 pub fn getFocus(self: *AnsiArt) *Focus { 2824 return self.focus; 2825 } 2826 2827 fn applySgr(style: *Grid.Style, params: []const u8) void { 2828 var nums: [16]u32 = undefined; 2829 var n: usize = 0; 2830 var it = std.mem.splitScalar(u8, params, ';'); 2831 while (it.next()) |tok| { 2832 if (n >= nums.len) break; 2833 // an empty parameter (e.g. bare "\x1b[m") means 0 2834 nums[n] = std.fmt.parseInt(u32, tok, 10) catch 0; 2835 n += 1; 2836 } 2837 if (n == 0) { 2838 style.* = .{}; 2839 return; 2840 } 2841 var i: usize = 0; 2842 while (i < n) : (i += 1) { 2843 switch (nums[i]) { 2844 0 => style.* = .{}, 2845 7 => style.inverted = true, 2846 27 => style.inverted = false, 2847 39 => style.fg = null, 2848 49 => style.bg = null, 2849 38, 48 => { 2850 // truecolor form: 38;2;r;g;b — anything else is ignored 2851 if (i + 4 < n and nums[i + 1] == 2) { 2852 const c = Grid.Color{ 2853 .r = @truncate(nums[i + 2]), 2854 .g = @truncate(nums[i + 3]), 2855 .b = @truncate(nums[i + 4]), 2856 }; 2857 if (nums[i] == 38) style.fg = c else style.bg = c; 2858 i += 4; 2859 } 2860 }, 2861 else => {}, 2862 } 2863 } 2864 } 2865 }; 2866 2867 // a full-screen wrapper that renders ANSI art behind whatever page it wraps 2868 pub const AnsiBackground = struct { 2869 grid: ?Grid, 2870 child: *Widget, 2871 art: AnsiArt, 2872 session: *Session, 2873 2874 pub fn init(allocator: std.mem.Allocator, child_widget: Widget, art_content: []const u8, session: *Session) !AnsiBackground { 2875 var cw = child_widget; 2876 const child = allocator.create(Widget) catch |e| { 2877 cw.deinit(allocator); 2878 return e; 2879 }; 2880 child.* = cw; 2881 errdefer { 2882 child.deinit(allocator); 2883 allocator.destroy(child); 2884 } 2885 return .{ .grid = null, .child = child, .art = try AnsiArt.init(allocator, art_content), .session = session }; 2886 } 2887 2888 pub fn deinit(self: *AnsiBackground, allocator: std.mem.Allocator) void { 2889 if (self.grid) |*grid| grid.deinit(); 2890 self.art.deinit(allocator); 2891 self.child.deinit(allocator); 2892 allocator.destroy(self.child); 2893 } 2894 2895 pub fn build(self: *AnsiBackground, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2896 self.clearGrid(); 2897 2898 // make the wrapped page fill the whole available area 2899 try self.child.build(allocator, .{ 2900 .min_size = .{ 2901 .width = constraint.max_size.width orelse constraint.min_size.width, 2902 .height = constraint.max_size.height orelse constraint.min_size.height, 2903 }, 2904 .max_size = constraint.max_size, 2905 }, root_focus); 2906 2907 if (self.session.data.enable_ansi) { 2908 if (self.child.getGrid()) |fg| { 2909 self.grid = try artBehind(allocator, fg, &self.art, .top_right, self.session.is_terminal, root_focus); 2910 } 2911 } 2912 } 2913 2914 pub fn input(self: *AnsiBackground, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2915 try self.child.input(allocator, key, root_focus); 2916 } 2917 2918 pub fn clearGrid(self: *AnsiBackground) void { 2919 if (self.grid) |*grid| { 2920 grid.deinit(); 2921 self.grid = null; 2922 } 2923 self.child.clearGrid(); 2924 self.art.clearGrid(); 2925 } 2926 2927 pub fn getGrid(self: AnsiBackground) ?Grid { 2928 return self.grid orelse self.child.getGrid(); 2929 } 2930 2931 pub fn getFocus(self: *AnsiBackground) *Focus { 2932 return self.child.getFocus(); 2933 } 2934 2935 // which top corner the art hugs. 2936 const ArtAnchor = enum { top_left, top_right }; 2937 2938 // a foreground cell counts as blank if it's empty or a bare space without styling 2939 fn cellIsBlank(cell: Grid.Cell) bool { 2940 if (cell.rune) |rune| { 2941 return std.mem.eql(u8, rune, " ") and 2942 cell.style.fg == null and cell.style.bg == null and !cell.style.inverted; 2943 } 2944 return true; 2945 } 2946 2947 // the art is dimmed to this fraction of its brightness so foreground text 2948 // stays legible over it 2949 const art_brightness = 45; // percent 2950 2951 fn dimColor(color: ?Grid.Color) ?Grid.Color { 2952 const c = color orelse return null; 2953 return .{ 2954 .r = @intCast(@as(u16, c.r) * art_brightness / 100), 2955 .g = @intCast(@as(u16, c.g) * art_brightness / 100), 2956 .b = @intCast(@as(u16, c.b) * art_brightness / 100), 2957 }; 2958 } 2959 2960 // terminals that don't support truecolor misparse a "38;2;r;g;b"/"48;2;…" 2961 // SGR as a list of plain SGR codes, so any channel value in 1..9 turns on 2962 // a text attribute (5/6 = blink, 7 = inverse, 8 = conceal, …). 2963 // snap such channels clear of that range so the backdrop doesn't blink or 2964 // hide text there; the ≤9/255 shift is imperceptible on terminals that 2965 // actually render truecolor. 2966 fn sgrSafe(color: ?Grid.Color) ?Grid.Color { 2967 const c = color orelse return null; 2968 const snap = struct { 2969 fn f(v: u8) u8 { 2970 return if (v >= 1 and v <= 9) 10 else v; 2971 } 2972 }.f; 2973 return .{ .r = snap(c.r), .g = snap(c.g), .b = snap(c.b) }; 2974 } 2975 2976 // composites ANSI art behind a foreground grid 2977 fn artBehind(allocator: std.mem.Allocator, foreground: Grid, art: *AnsiArt, anchor: ArtAnchor, is_terminal: bool, root_focus: *Focus) !Grid { 2978 art.clearGrid(); 2979 try art.build(allocator, .{ 2980 .min_size = .{ .width = null, .height = null }, 2981 .max_size = .{ .width = foreground.size.width, .height = foreground.size.height }, 2982 }, root_focus); 2983 2984 var out = try Grid.initFromGrid(allocator, foreground, foreground.size, 0, 0); 2985 errdefer out.deinit(); 2986 2987 if (art.getGrid()) |art_grid| { 2988 const anchor_x = switch (anchor) { 2989 .top_left => 0, 2990 .top_right => foreground.size.width -| art_grid.size.width, 2991 }; 2992 for (0..art_grid.size.height) |y| { 2993 for (0..art_grid.size.width) |x| { 2994 const src = art_grid.cells.items[try art_grid.cells.at(.{ y, x })]; 2995 if (src.rune == null) continue; 2996 const idx = out.cells.at(.{ y, anchor_x + x }) catch continue; 2997 const dst = &out.cells.items[idx]; 2998 // composite the dimmed art behind every cell so it shows 2999 // through the whole UI: a blank cell becomes the art, while a 3000 // cell with a glyph keeps the glyph but takes the dimmed art as 3001 // its background (replacing whatever background it had, which 3002 // would otherwise obscure the art). 3003 if (cellIsBlank(dst.*)) { 3004 dst.* = src; 3005 dst.style.fg = sgrSafe(dimColor(dst.style.fg)); 3006 dst.style.bg = sgrSafe(dimColor(dst.style.bg)); 3007 } else { 3008 const background_maybe = sgrSafe(dimColor(src.style.bg orelse src.style.fg)); 3009 dst.style.bg = background_maybe; 3010 // change the color of text overlaying ANSI art to ensure 3011 // it is readable. don't do this in the web UI, since we 3012 // have direct control of the theme there (also, inner 3013 // scroll panes allow text to move without a re-render 3014 // by the TUI, which would break this). also don't do this 3015 // if the text is explicitly styled. 3016 if (is_terminal and dst.style.fg == null) { 3017 if (background_maybe) |background| { 3018 // use near-black and near-white, which is easier on the eyes 3019 // while retaining high contrast 3020 const luminance = (@as(u32, background.r) * 299 + 3021 @as(u32, background.g) * 587 + 3022 @as(u32, background.b) * 114) / 1000; 3023 dst.style.fg = if (luminance >= 128) 3024 .{ .r = 16, .g = 16, .b = 16 } 3025 else 3026 .{ .r = 240, .g = 240, .b = 240 }; 3027 } 3028 } 3029 } 3030 } 3031 } 3032 } 3033 return out; 3034 } 3035 }; 3036