Пустое окно

src/main.zig

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+const std = @import("std");
+const builtin = @import("builtin");
+const dvui = @import("dvui");
+const SDLBackend = @import("sdl-backend");
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+
+    var backend = try SDLBackend.initWindow(.{
+        .allocator = allocator,
+        .size = .{ .w = 800.0, .h = 600.0 },
+        .title = "My DVUI App",
+        .vsync = true,
+    });
+    defer backend.deinit();
+
+    var win = try dvui.Window.init(@src(), allocator, backend.backend(), .{
+        .theme = switch (backend.preferredColorScheme() orelse .light) {
+            .light => dvui.Theme.builtin.adwaita_light,
+            .dark => dvui.Theme.builtin.adwaita_dark,
+        },
+    });
+    defer win.deinit();
+
+    var interrupted = false;
+
+    main_loop: while (true) {
+        // beginWait coordinates with waitTime below to run frames only when needed
+        const nstime = win.beginWait(interrupted);
+
+        // marks the beginning of a frame for dvui, can call dvui functions after this
+        try win.begin(nstime);
+
+        // send all SDL events to dvui for processing
+        try backend.addAllEvents(&win);
+
+        // if dvui widgets might not cover the whole window, then need to clear
+        // the previous frame's render
+        _ = SDLBackend.c.SDL_SetRenderDrawColor(backend.renderer, 0, 0, 0, 255);
+        _ = SDLBackend.c.SDL_RenderClear(backend.renderer);
+
+        const keep_running = gui_frame();
+        if (!keep_running) break :main_loop;
+
+        // marks end of dvui frame, don't call dvui functions after this
+        // - sends all dvui stuff to backend for rendering, must be called before renderPresent()
+        const end_micros = try win.end(.{});
+
+        // cursor management
+        try backend.setCursor(win.cursorRequested());
+        try backend.textInputRect(win.textInputRequested());
+
+        // render frame to OS
+        try backend.renderPresent();
+
+        // waitTime and beginWait combine to achieve variable framerates
+        const wait_event_micros = win.waitTime(end_micros);
+        interrupted = try backend.waitEventTimeout(wait_event_micros);
+    }
+}
+
+fn gui_frame() bool {
+    return true;
+}