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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126const std = @import("std");const vaxis = @import("vaxis");const Cell = vaxis.Cell;
const log = std.log.scoped(.main);pub fn main(init: std.process.Init) !void { const io = init.io; const alloc = init.gpa;
var buffer: [1024]u8 = undefined; var tty = try vaxis.Tty.init(io, &buffer); defer tty.deinit();
var vx = try vaxis.init(io, alloc, init.environ_map, .{}); defer vx.deinit(alloc, tty.writer());
var loop: vaxis.Loop(Event) = .init(io, &tty, &vx);
try loop.start(); defer loop.stop();
// Optionally enter the alternate screen try vx.enterAltScreen(tty.writer()); try vx.queryTerminal(tty.writer(), .fromSeconds(1));
// We'll adjust the color index every keypress var color_idx: u8 = 0; const msg = "Hello, world!";
var scale: u3 = 1;
// The main event loop. Vaxis provides a thread safe, blocking, buffered // queue which can serve as the primary event queue for an application while (true) { // nextEvent blocks until an event is in the queue const event = try loop.nextEvent(); // log.debug("event: {}", .{event}); // exhaustive switching ftw. Vaxis will send events if your Event // enum has the fields for those events (ie "key_press", "winsize") switch (event) { .key_press => |key| { color_idx = switch (color_idx) { 255 => 0, else => color_idx + 1, }; if (key.codepoint == 'c' and key.mods.ctrl) { break; } if (key.matches('j', .{})) { if (vx.caps.scaled_text and scale > 1) { scale -= 1; } } if (key.matches('k', .{})) { if (vx.caps.scaled_text and scale < 7) { scale += 1; } } }, .winsize => |ws| { try vx.resize(alloc, tty.writer(), ws); }, else => {}, }
// vx.window() returns the root window. This window is the size of the // terminal and can spawn child windows as logical areas. Child windows // cannot draw outside of their bounds const win = vx.window(); // Clear the entire space because we are drawing in immediate mode. // vaxis double buffers the screen. This new frame will be compared to // the old and only updated cells will be drawn win.clear();
const msg_len: u16 = @intCast(msg.len); // Create some child window. .expand means the height and width will // fill the remaining space of the parent. Child windows do not store a // reference to their parent: this is true immediate mode. Do not store // windows, always create new windows each render cycle const child = win.child( .{ .x_off = win.width / 2 - msg_len / 2, .y_off = win.height / 2 }, ); // Loop through the message and print the cells to the screen for (msg, 0..) |_, i| { const cell: Cell = .{ // each cell takes a _grapheme_ as opposed to a single // codepoint. This allows Vaxis to handle emoji properly, // particularly with terminals that the Unicode Core extension // (IE Mode 2027) .char = .{ .grapheme = msg[i .. i + 1] }, .style = .{ .fg = .{ .index = color_idx }, }, .scale = .{ .scale = scale, }, }; const second_cell: Cell = .{ .char = .{ .grapheme = msg[i .. i + 1] }, .style = .{ .fg = .{ .index = color_idx }, }, }; child.writeCell(@intCast(i * scale), 0, cell); child.writeCell(@intCast(i), scale - 1, second_cell); child.writeCell(@intCast(i), scale, second_cell); } // Render the screen try vx.render(tty.writer()); }}
// Our Event. This can contain internal events as well as Vaxis events.// Internal events can be posted into the same queue as vaxis events to allow// for a single event loop with exhaustive switching. Booyaconst Event = union(enum) { key_press: vaxis.Key, winsize: vaxis.Winsize, focus_in, foo: u8,};
test { std.testing.refAllDecls(@This());}