멀티 윈도우 앱

const std = @import("std");
const ui = @import("ui");
const zenit_app = @import("zenit_app");

fn mountEditor(cx: *ui.Cx, scope: *ui.Scope) anyerror!*ui.Node {
    _ = scope;
    return ui.box(cx, .{ .width = .fill(), .height = .fill() }, .{});
}

fn mountPreview(cx: *ui.Cx, scope: *ui.Scope) anyerror!*ui.Node {
    _ = scope;
    return ui.box(cx, .{ .width = .fill(), .height = .fill() }, .{});
}

pub fn main() !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    defer _ = gpa.deinit();

    var application = zenit_app.MultiWindowApp.init(gpa.allocator(), .{});
    defer application.deinit();

    // createWindowWith = create + mount in one transaction: if mount fails,
    // every native / GPU resource of that window is torn down again.
    const editor = try application.createWindowWith(.{
        .window = .{ .width = 900, .height = 700, .title = "Editor" },
    }, mountEditor);

    _ = try application.createWindowWith(.{
        .window = .{ .width = 480, .height = 700, .title = "Preview" },
    }, mountPreview);

    _ = application.activateWindow(editor.windowId());
    try application.run(); // returns after the last window closes or quit()
}

const preview_id = preview.windowId(); // preview: *App from createWindowWith

// Safe from inside an input / menu / render callback: the close is queued
// and committed at the loop's iteration boundary.
_ = application.closeWindow(preview_id);

// Look windows up by id instead of holding *App across a close.
if (application.window(preview_id)) |app| {
    _ = app; // still alive
}