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widgets: add LineNumbers widget
The LineNumbers widget draws vertical list of numbers.
This can be used as a line number bar for a text editor for example.
authored by
Jari Vetoniemi
and committed by
Tim Culverhouse
b215aec7
f25b8ab4
+55
+1
src/widgets.zig
+1
src/widgets.zig
+54
src/widgets/LineNumbers.zig
+54
src/widgets/LineNumbers.zig
···
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const std = @import("std");
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const vaxis = @import("../main.zig");
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const digits = "0123456789";
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num_lines: usize = std.math.maxInt(usize),
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highlighted_line: usize = 0,
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style: vaxis.Style = .{ .dim = true },
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highlighted_style: vaxis.Style = .{ .dim = true, .bg = .{ .index = 0 } },
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pub fn extractDigit(v: usize, n: usize) usize {
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return (v / (std.math.powi(usize, 10, n) catch unreachable)) % 10;
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}
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pub fn numDigits(v: usize) usize {
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return switch (v) {
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0...9 => 1,
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10...99 => 2,
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100...999 => 3,
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1000...9999 => 4,
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10000...99999 => 5,
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100000...999999 => 6,
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1000000...9999999 => 7,
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10000000...99999999 => 8,
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else => 0,
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};
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}
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pub fn draw(self: @This(), win: vaxis.Window, y_scroll: usize) void {
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for (1 + y_scroll..self.num_lines) |line| {
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if (line - 1 >= y_scroll +| win.height) {
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break;
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}
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const highlighted = line == self.highlighted_line;
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const num_digits = numDigits(line);
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for (0..num_digits) |i| {
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const digit = extractDigit(line, i);
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win.writeCell(win.width -| (i + 2), line -| (y_scroll +| 1), .{
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.char = .{
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.width = 1,
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.grapheme = digits[digit .. digit + 1],
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},
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.style = if (highlighted) self.highlighted_style else self.style,
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});
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}
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if (highlighted) {
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for (num_digits + 1..win.width) |i| {
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win.writeCell(i, line -| (y_scroll +| 1), .{
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.style = if (highlighted) self.highlighted_style else self.style,
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});
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}
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}
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}
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}