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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104const std = @import("std");const vaxis = @import("../main.zig");
const Allocator = std.mem.Allocator;
const vxfw = @import("vxfw.zig");
const SizedBox = @This();
child: vxfw.Widget,size: vxfw.Size,
pub fn widget(self: *const SizedBox) vxfw.Widget { return .{ .userdata = @constCast(self), .drawFn = typeErasedDrawFn, };}
fn typeErasedDrawFn(ptr: *anyopaque, ctx: vxfw.DrawContext) Allocator.Error!vxfw.Surface { const self: *const SizedBox = @ptrCast(@alignCast(ptr)); const max: vxfw.MaxSize = .{ .width = if (ctx.max.width) |max_w| max_w else self.size.width, .height = if (ctx.max.height) |max_h| max_h else self.size.height, }; const min: vxfw.Size = .{ .width = @min(@max(ctx.min.width, self.size.width), max.width.?), .height = @min(@max(ctx.min.height, self.size.height), max.height.?), }; return self.child.draw(ctx.withConstraints(min, max));}
test SizedBox { // Create a test widget that saves the constraints it was given const TestWidget = struct { min: vxfw.Size, max: vxfw.MaxSize,
pub fn widget(self: *@This()) vxfw.Widget { return .{ .userdata = self, .drawFn = @This().typeErasedDrawFn, }; }
fn typeErasedDrawFn(ptr: *anyopaque, ctx: vxfw.DrawContext) std.mem.Allocator.Error!vxfw.Surface { const self: *@This() = @ptrCast(@alignCast(ptr)); self.min = ctx.min; self.max = ctx.max; return .{ .size = ctx.min, .widget = self.widget(), .buffer = &.{}, .children = &.{}, }; } };
// Boiler plate draw context var arena = std.heap.ArenaAllocator.init(std.testing.allocator); defer arena.deinit(); vxfw.DrawContext.init(.unicode);
var draw_ctx: vxfw.DrawContext = .{ .arena = arena.allocator(), .min = .{}, .max = .{ .width = 16, .height = 16 }, .cell_size = .{ .width = 10, .height = 20 }, };
var test_widget: TestWidget = .{ .min = .{}, .max = .{} };
// SizedBox tries to draw the child widget at the specified size. It will shrink to fit within // constraints const sized_box: SizedBox = .{ .child = test_widget.widget(), .size = .{ .width = 10, .height = 10 }, };
const box_widget = sized_box.widget(); { const result = try box_widget.draw(draw_ctx); // The sized box is smaller than the constraints, so we should be the desired size try std.testing.expectEqual(sized_box.size, result.size); }
{ draw_ctx.max.height = 8; const result = try box_widget.draw(draw_ctx); // The sized box is smaller than the constraints, so we should be that size try std.testing.expectEqual(@as(vxfw.Size, .{ .width = 10, .height = 8 }), result.size); }
draw_ctx.max.width = 8; _ = try box_widget.draw(draw_ctx); // The sized box is smaller than the constraints, so we should be that size try std.testing.expectEqual(@as(vxfw.Size, .{ .width = 8, .height = 8 }), test_widget.min); try std.testing.expectEqual(@as(vxfw.Size, .{ .width = 8, .height = 8 }), test_widget.max.size());}
test "refAllDecls" { std.testing.refAllDecls(@This());}