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vxfw: add SizedBox widget
+110
+109
src/vxfw/SizedBox.zig
+109
src/vxfw/SizedBox.zig
···
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const std = @import("std");
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const vaxis = @import("../main.zig");
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const Allocator = std.mem.Allocator;
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const vxfw = @import("vxfw.zig");
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const SizedBox = @This();
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child: vxfw.Widget,
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size: vxfw.Size,
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pub fn widget(self: *const SizedBox) vxfw.Widget {
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return .{
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.userdata = @constCast(self),
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.eventHandler = typeErasedEventHandler,
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.drawFn = typeErasedDrawFn,
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};
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}
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fn typeErasedEventHandler(ptr: *anyopaque, ctx: *vxfw.EventContext, event: vxfw.Event) anyerror!void {
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const self: *const SizedBox = @ptrCast(@alignCast(ptr));
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return self.child.handleEvent(ctx, event);
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}
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fn typeErasedDrawFn(ptr: *anyopaque, ctx: vxfw.DrawContext) Allocator.Error!vxfw.Surface {
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const self: *const SizedBox = @ptrCast(@alignCast(ptr));
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const max: vxfw.MaxSize = .{
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.width = if (ctx.max.width) |max_w| @min(max_w, self.size.width) else self.size.width,
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.height = if (ctx.max.height) |max_h| @min(max_h, self.size.height) else self.size.height,
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};
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const min: vxfw.Size = .{
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.width = @max(ctx.min.width, max.width.?),
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.height = @max(ctx.min.height, max.height.?),
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};
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return self.child.draw(ctx.withConstraints(min, max));
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}
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test SizedBox {
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// Create a test widget that saves the constraints it was given
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const TestWidget = struct {
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min: vxfw.Size,
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max: vxfw.MaxSize,
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pub fn widget(self: *@This()) vxfw.Widget {
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return .{
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.userdata = self,
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.eventHandler = vxfw.noopEventHandler,
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.drawFn = @This().typeErasedDrawFn,
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};
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}
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fn typeErasedDrawFn(ptr: *anyopaque, ctx: vxfw.DrawContext) std.mem.Allocator.Error!vxfw.Surface {
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const self: *@This() = @ptrCast(@alignCast(ptr));
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self.min = ctx.min;
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self.max = ctx.max;
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return .{
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.size = ctx.min,
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.widget = self.widget(),
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.buffer = &.{},
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.children = &.{},
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};
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}
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};
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// Boiler plate draw context
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var arena = std.heap.ArenaAllocator.init(std.testing.allocator);
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defer arena.deinit();
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const ucd = try vaxis.Unicode.init(arena.allocator());
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vxfw.DrawContext.init(&ucd, .unicode);
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var draw_ctx: vxfw.DrawContext = .{
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.arena = arena.allocator(),
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.min = .{},
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.max = .{ .width = 16, .height = 16 },
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};
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var test_widget: TestWidget = .{ .min = .{}, .max = .{} };
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// SizedBox tries to draw the child widget at the specified size. It will shrink to fit within
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// constraints
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const sized_box: SizedBox = .{
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.child = test_widget.widget(),
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.size = .{ .width = 10, .height = 10 },
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};
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const box_widget = sized_box.widget();
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_ = try box_widget.draw(draw_ctx);
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// The sized box is smaller than the constraints, so we should be the desired size
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try std.testing.expectEqual(sized_box.size, test_widget.min);
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try std.testing.expectEqual(sized_box.size, test_widget.max.size());
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draw_ctx.max.height = 8;
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_ = try box_widget.draw(draw_ctx);
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// The sized box is smaller than the constraints, so we should be that size
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try std.testing.expectEqual(@as(vxfw.Size, .{ .width = 10, .height = 8 }), test_widget.min);
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try std.testing.expectEqual(@as(vxfw.Size, .{ .width = 10, .height = 8 }), test_widget.max.size());
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draw_ctx.max.width = 8;
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_ = try box_widget.draw(draw_ctx);
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// The sized box is smaller than the constraints, so we should be that size
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try std.testing.expectEqual(@as(vxfw.Size, .{ .width = 8, .height = 8 }), test_widget.min);
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try std.testing.expectEqual(@as(vxfw.Size, .{ .width = 8, .height = 8 }), test_widget.max.size());
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}
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test "refAllDecls" {
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std.testing.refAllDecls(@This());
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}
+1
src/vxfw/vxfw.zig
+1
src/vxfw/vxfw.zig
···
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pub const ListView = @import("ListView.zig");
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pub const Padding = @import("Padding.zig");
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pub const RichText = @import("RichText.zig");
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pub const SizedBox = @import("SizedBox.zig");
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pub const Text = @import("Text.zig");
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pub const TextField = @import("TextField.zig");
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