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window: add child method for cleaner child spawning
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@rockorager
rockorager committed Mar 21, 2024
1 parent 7e23a64 commit 5e1f9b1
Showing 1 changed file with 127 additions and 14 deletions.
141 changes: 127 additions & 14 deletions src/Window.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -39,10 +39,10 @@ pub fn initChild(
height: Size,
) Window {
const resolved_width = switch (width) {
.expand => self.width - x_off,
.expand => self.width -| x_off,
.limit => |w| blk: {
if (w + x_off > self.width) {
break :blk self.width - x_off;
break :blk self.width -| x_off;
}
break :blk w;
},
Expand All @@ -65,6 +65,119 @@ pub fn initChild(
};
}

pub const ChildOptions = struct {
x_off: usize = 0,
y_off: usize = 0,
/// the width of the resulting child, including any borders
width: Size = .expand,
/// the height of the resulting child, including any borders
height: Size = .expand,
border: BorderOptions = .{},
};

pub const BorderOptions = struct {
style: Cell.Style = .{},
where: enum {
none,
all,
top,
right,
bottom,
left,
} = .none,
glyphs: Glyphs = .single_rounded,

pub const Glyphs = union(enum) {
single_rounded,
single_square,
/// custom border glyphs. each glyph should be one cell wide and the
/// following indices apply:
/// [0] = top left
/// [1] = horizontal
/// [2] = top right
/// [3] = vertical
/// [4] = bottom right
/// [5] = bottom left
custom: [6][]const u8,
};

const single_rounded: [6][]const u8 = .{ "╭", "─", "╮", "│", "╯", "╰" };
const single_square: [6][]const u8 = .{ "┌", "─", "┐", "│", "┘", "└" };
};

/// create a child window
pub fn child(self: Window, opts: ChildOptions) Window {
var result = self.initChild(opts.x_off, opts.y_off, opts.width, opts.height);

const glyphs = switch (opts.border.glyphs) {
.single_rounded => BorderOptions.single_rounded,
.single_square => BorderOptions.single_square,
.custom => |custom| custom,
};

const top_left: Cell.Character = .{ .grapheme = glyphs[0], .width = 1 };
const horizontal: Cell.Character = .{ .grapheme = glyphs[1], .width = 1 };
const top_right: Cell.Character = .{ .grapheme = glyphs[2], .width = 1 };
const vertical: Cell.Character = .{ .grapheme = glyphs[3], .width = 1 };
const bottom_right: Cell.Character = .{ .grapheme = glyphs[4], .width = 1 };
const bottom_left: Cell.Character = .{ .grapheme = glyphs[5], .width = 1 };
const style = opts.border.style;

const h = result.height;
const w = result.width;

switch (opts.border.where) {
.none => return result,
.all => {
result.writeCell(0, 0, .{ .char = top_left, .style = style });
result.writeCell(0, h -| 1, .{ .char = bottom_left, .style = style });
result.writeCell(w - 1, 0, .{ .char = top_right, .style = style });
result.writeCell(w - 1, h -| 1, .{ .char = bottom_right, .style = style });
var i: usize = 1;
while (i < (h - 1)) : (i += 1) {
result.writeCell(0, i, .{ .char = vertical, .style = style });
result.writeCell(w -| 1, i, .{ .char = vertical, .style = style });
}
i = 1;
while (i < w - 1) : (i += 1) {
result.writeCell(i, 0, .{ .char = horizontal, .style = style });
result.writeCell(i, h -| 1, .{ .char = horizontal, .style = style });
}
return result.initChild(1, 1, .{ .limit = w - 2 }, .{ .limit = h - 2 });
},
.top => {
var i: usize = 0;
while (i < w) : (i += 1) {
result.writeCell(i, 0, .{ .char = horizontal, .style = style });
}
return result.initChild(1, 0, .expand, .expand);
},
.right => {
var i: usize = 0;
while (i < h) : (i += 1) {
result.writeCell(w -| 1, i, .{ .char = vertical, .style = style });
}
return result.initChild(0, 0, .{ .limit = w -| 1 }, .expand);
},
.bottom => {
var i: usize = 0;
while (i < w) : (i += 1) {
result.writeCell(i, h -| 1, .{ .char = horizontal, .style = style });
}
return result.initChild(0, 0, .expand, .{ .limit = h -| 1 });
},
.left => {
var i: usize = 0;
while (i < h) : (i += 1) {
result.writeCell(0, i, .{ .char = vertical, .style = style });
}
return result.initChild(1, 0, .expand, .expand);
},
}

return result;
}

/// writes a cell to the location in the window
pub fn writeCell(self: Window, col: usize, row: usize, cell: Cell) void {
if (self.height == 0 or self.width == 0) return;
Expand Down Expand Up @@ -247,9 +360,9 @@ test "Window size set" {
.screen = undefined,
};

const child = parent.initChild(1, 1, .expand, .expand);
try std.testing.expectEqual(19, child.width);
try std.testing.expectEqual(19, child.height);
const ch = parent.initChild(1, 1, .expand, .expand);
try std.testing.expectEqual(19, ch.width);
try std.testing.expectEqual(19, ch.height);
}

test "Window size set too big" {
Expand All @@ -261,9 +374,9 @@ test "Window size set too big" {
.screen = undefined,
};

const child = parent.initChild(0, 0, .{ .limit = 21 }, .{ .limit = 21 });
try std.testing.expectEqual(20, child.width);
try std.testing.expectEqual(20, child.height);
const ch = parent.initChild(0, 0, .{ .limit = 21 }, .{ .limit = 21 });
try std.testing.expectEqual(20, ch.width);
try std.testing.expectEqual(20, ch.height);
}

test "Window size set too big with offset" {
Expand All @@ -275,9 +388,9 @@ test "Window size set too big with offset" {
.screen = undefined,
};

const child = parent.initChild(10, 10, .{ .limit = 21 }, .{ .limit = 21 });
try std.testing.expectEqual(10, child.width);
try std.testing.expectEqual(10, child.height);
const ch = parent.initChild(10, 10, .{ .limit = 21 }, .{ .limit = 21 });
try std.testing.expectEqual(10, ch.width);
try std.testing.expectEqual(10, ch.height);
}

test "Window size nested offsets" {
Expand All @@ -289,7 +402,7 @@ test "Window size nested offsets" {
.screen = undefined,
};

const child = parent.initChild(10, 10, .{ .limit = 21 }, .{ .limit = 21 });
try std.testing.expectEqual(11, child.x_off);
try std.testing.expectEqual(11, child.y_off);
const ch = parent.initChild(10, 10, .{ .limit = 21 }, .{ .limit = 21 });
try std.testing.expectEqual(11, ch.x_off);
try std.testing.expectEqual(11, ch.y_off);
}

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