this repo has no description
feat(examples): Added ListView example
authored by
vg006
and committed by
Tim Culverhouse
4b3850ac
de08b6c7
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+99
examples/list_view.zig
+99
examples/list_view.zig
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const std = @import("std");
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const vaxis = @import("vaxis");
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const vxfw = vaxis.vxfw;
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const Text = vxfw.Text;
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const ListView = vxfw.ListView;
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const Widget = vxfw.Widget;
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const Model = struct {
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list_view: ListView,
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pub fn widget(self: *Model) Widget {
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return .{
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.userdata = self,
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.eventHandler = Model.typeErasedEventHandler,
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.drawFn = Model.typeErasedDrawFn,
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};
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}
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pub fn typeErasedEventHandler(ptr: *anyopaque, ctx: *vxfw.EventContext, event: vxfw.Event) anyerror!void {
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const self: *Model = @ptrCast(@alignCast(ptr));
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try ctx.requestFocus(self.list_view.widget());
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switch (event) {
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.key_press => |key| {
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if (key.matches('q', .{}) or key.matchExact('c', .{ .ctrl = true })) {
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ctx.quit = true;
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return;
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}
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},
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else => {},
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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: *Model = @ptrCast(@alignCast(ptr));
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const max = ctx.max.size();
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const list_view: vxfw.SubSurface = .{
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.origin = .{ .row = 1, .col = 1 },
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.surface = try self.list_view.draw(ctx),
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};
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const children = try ctx.arena.alloc(vxfw.SubSurface, 1);
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children[0] = list_view;
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return .{
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.size = max,
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.widget = self.widget(),
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.buffer = &.{},
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.children = children,
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};
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}
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};
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pub fn main() !void {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer _ = gpa.deinit();
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const allocator = gpa.allocator();
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var app = try vxfw.App.init(allocator);
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defer app.deinit();
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const model = try allocator.create(Model);
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defer allocator.destroy(model);
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const n = 80;
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var texts = try std.ArrayList(Widget).initCapacity(allocator, n);
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var allocs = try std.ArrayList(*Text).initCapacity(allocator, n);
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defer {
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for (allocs.items) |tw| {
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allocator.free(tw.text);
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allocator.destroy(tw);
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}
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allocs.deinit(allocator);
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texts.deinit(allocator);
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}
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for (0..n) |i| {
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const t = std.fmt.allocPrint(allocator, "List Item {d}", .{i}) catch "placeholder";
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const tw = try allocator.create(Text);
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tw.* = .{ .text = t };
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_ = try allocs.append(allocator, tw);
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_ = try texts.append(allocator, tw.widget());
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}
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model.* = .{
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.list_view = .{
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.wheel_scroll = 3,
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.scroll = .{
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.wants_cursor = true,
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},
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.children = .{ .slice = texts.items },
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},
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};
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try app.run(model.widget(), .{});
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}