какое то скроллирование

This reverts commit 68a4647e3f.

src/Document.zig

@@ -0,0 +1 @@
+// Файл векторного документа

src/WindowContext.zig

@@ -0,0 +1,88 @@
+const std = @import("std");
+const dvui = @import("dvui");
+const Color = dvui.Color;
+
+const WindowContext = @This();
+
+allocator: std.mem.Allocator,
+canvas_texture: ?dvui.Texture = null,
+canvas_width: u32 = 400,
+canvas_height: u32 = 300,
+canvas_pos: dvui.Point = dvui.Point{ .x = 0, .y = 0 },
+canvas_scroll: dvui.ScrollInfo = .{
+    .vertical = .given,
+    .horizontal = .given,
+    .virtual_size = .{ .w = 2000, .h = 2000 },
+},
+
+pub fn init(allocator: std.mem.Allocator) WindowContext {
+    return .{
+        .allocator = allocator,
+    };
+}
+
+/// Заполнить canvas случайным цветом на CPU
+pub fn fillRandomColor(self: *WindowContext) !void {
+    var prng = std.Random.DefaultPrng.init(@intCast(std.time.microTimestamp()));
+    const random = prng.random();
+
+    // Выделить буфер пиксельных данных
+    const pixels = try self.allocator.alloc(Color.PMA, @as(usize, self.canvas_width) * self.canvas_height);
+    defer self.allocator.free(pixels);
+
+    // Заполнить случайными цветами
+    const r = random.int(u8);
+    const g = random.int(u8);
+    const b = random.int(u8);
+
+    var prev: dvui.Color.PMA = .{
+        .r = r,
+        .g = g,
+        .b = b,
+        .a = 255,
+    };
+    for (pixels) |*pixel| {
+        const r_delta = random.intRangeAtMost(i16, -1, 1);
+        const g_delta = random.intRangeAtMost(i16, -1, 1);
+        const b_delta = random.intRangeAtMost(i16, -1, 1);
+
+        const r_new: i16 = @as(i16, prev.r) + r_delta;
+        const g_new: i16 = @as(i16, prev.g) + g_delta;
+        const b_new: i16 = @as(i16, prev.b) + b_delta;
+
+        pixel.* = .{
+            .r = @intCast(std.math.clamp(r_new, 0, 255)),
+            .g = @intCast(std.math.clamp(g_new, 0, 255)),
+            .b = @intCast(std.math.clamp(b_new, 0, 255)),
+            .a = 255,
+        };
+        prev = pixel.*;
+    }
+
+    // Удалить старую текстуру
+    if (self.canvas_texture) |tex| {
+        dvui.Texture.destroyLater(tex);
+    }
+
+    // Создать новую текстуру из пиксельных данных
+    self.canvas_texture = try dvui.textureCreate(pixels, self.canvas_width, self.canvas_height, .linear);
+
+    // Дать скроллам ощутимый диапазон сразу (минимум 2000x2000)
+    self.canvas_scroll.virtual_size = .{
+        .w = @max(2000, @as(f32, @floatFromInt(self.canvas_width))),
+        .h = @max(2000, @as(f32, @floatFromInt(self.canvas_height))),
+    };
+}
+
+/// Отобразить canvas в UI
+pub fn render(self: WindowContext, rect: dvui.Rect.Physical) !void {
+    if (self.canvas_texture) |texture| {
+        try dvui.renderTexture(texture, .{ .r = rect }, .{});
+    }
+}
+
+pub fn deinit(self: *WindowContext) void {
+    if (self.canvas_texture) |texture| {
+        dvui.Texture.destroyLater(texture);
+    }
+}

src/main.zig

@@ -1,215 +1,163 @@
 const std = @import("std");
 const builtin = @import("builtin");
 const dvui = @import("dvui");
+const dvui_ext = @import("./ui/dvui_ext.zig");
 const SDLBackend = @import("sdl-backend");
-
-const WindowContext = struct {
-    backend: SDLBackend,
-    window: dvui.Window,
-    title: [:0]u8,
-    id: usize,
-
-    fn deinit(self: *WindowContext, allocator: std.mem.Allocator, last_backend: bool) void {
-        self.window.deinit();
-
-        if (last_backend) {
-            self.backend.deinit();
-        } else {
-            destroyBackendKeepingSDL(&self.backend);
-        }
-
-        allocator.free(self.title);
-        self.* = undefined;
-    }
-};
+const Document = @import("Document.zig");
+const WindowContext = @import("WindowContext.zig");
+const sdl_c = SDLBackend.c;
+const Allocator = std.mem.Allocator;
+const Color = dvui.Color;
 
 pub fn main() !void {
-    if (@import("builtin").os.tag == .windows) {
-        // on windows graphical apps have no console, so output goes to nowhere - attach it manually. related: https://github.com/ziglang/zig/issues/4196
-        dvui.Backend.Common.windowsAttachConsole() catch {};
-    }
-    SDLBackend.enableSDLLogging();
-    std.log.info("SDL version: {f}", .{SDLBackend.getSDLVersion()});
-
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
-    defer _ = gpa.deinit();
     const allocator = gpa.allocator();
 
-    var windows = try std.ArrayList(*WindowContext).initCapacity(allocator, 0);
-    defer {
-        for (windows.items, 0..) |ctx, i| {
-            const last = i + 1 == windows.items.len;
-            ctx.deinit(allocator, last);
-            allocator.destroy(ctx);
-        }
-        windows.deinit(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 next_window_id: usize = 1;
-    const first_ctx = try createWindow(allocator, next_window_id);
-    next_window_id += 1;
-    try windows.append(allocator, first_ctx);
+    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 ctx = WindowContext.init(allocator);
+    defer ctx.deinit();
 
     var interrupted = false;
 
     main_loop: while (true) {
-        if (windows.items.len == 0) break :main_loop;
+        // beginWait coordinates with waitTime below to run frames only when needed
+        const nstime = win.beginWait(interrupted);
 
-        const saw_events = try pumpEvents(&windows);
+        // marks the beginning of a frame for dvui, can call dvui functions after this
+        try win.begin(nstime);
 
-        var min_wait_event_micros: u32 = std.math.maxInt(u32);
-        var idx: usize = 0;
-        while (idx < windows.items.len) {
-            const ctx = windows.items[idx];
+        // send all SDL events to dvui for processing
+        try backend.addAllEvents(&win);
 
-            // beginWait coordinates with waitTime below to run frames only when needed
-            const nstime = ctx.window.beginWait(interrupted);
-            // marks the beginning of a frame for dvui, can call dvui functions after this
-            try ctx.window.begin(nstime);
+        // 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);
 
-            // if dvui widgets might not cover the whole window, then need to clear
-            // the previous frame's render
-            _ = SDLBackend.c.SDL_SetRenderDrawColor(ctx.backend.renderer, 0, 0, 0, 255);
-            _ = SDLBackend.c.SDL_RenderClear(ctx.backend.renderer);
+        const keep_running = gui_frame(&ctx);
+        if (!keep_running) break :main_loop;
 
-            const keep_open = try gui_frame(ctx, allocator, &windows, &next_window_id);
-            if (!keep_open) {
-                closeWindow(&windows, allocator, idx);
-                continue;
-            }
+        // 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(.{});
 
-            // 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 ctx.window.end(.{});
+        // cursor management
+        try backend.setCursor(win.cursorRequested());
+        try backend.textInputRect(win.textInputRequested());
 
-            // cursor management
-            try ctx.backend.setCursor(ctx.window.cursorRequested());
-            try ctx.backend.textInputRect(ctx.window.textInputRequested());
+        // render frame to OS
+        try backend.renderPresent();
 
-            // render frame to OS
-            try ctx.backend.renderPresent();
-
-            // waitTime and beginWait combine to achieve variable framerates
-            const wait_event_micros = ctx.window.waitTime(end_micros);
-            min_wait_event_micros = @min(min_wait_event_micros, wait_event_micros);
-
-            idx += 1;
-        }
-
-        if (windows.items.len == 0) break :main_loop;
-
-        interrupted = saw_events or try windows.items[0].backend.waitEventTimeout(min_wait_event_micros);
+        // waitTime and beginWait combine to achieve variable framerates
+        const wait_event_micros = win.waitTime(end_micros);
+        interrupted = try backend.waitEventTimeout(wait_event_micros);
     }
 }
 
-fn createWindow(allocator: std.mem.Allocator, id: usize) !*WindowContext {
-    var ctx = try allocator.create(WindowContext);
-    errdefer allocator.destroy(ctx);
-
-    ctx.id = id;
-
-    const title_bytes = try std.fmt.allocPrint(allocator, "My DVUI App #{d}", .{id});
-    defer allocator.free(title_bytes);
-
-    ctx.title = try allocator.allocSentinel(u8, title_bytes.len, 0);
-    @memcpy(ctx.title[0..title_bytes.len], title_bytes);
-
-    ctx.backend = try SDLBackend.initWindow(.{
-        .allocator = allocator,
-        .size = .{ .w = 800.0, .h = 600.0 },
-        .title = ctx.title,
-        .vsync = true,
-    });
-    errdefer destroyBackendKeepingSDL(&ctx.backend);
-
-    const theme = switch (ctx.backend.preferredColorScheme() orelse .light) {
-        .light => dvui.Theme.builtin.adwaita_light,
-        .dark => dvui.Theme.builtin.adwaita_dark,
-    };
-
-    ctx.window = try dvui.Window.init(@src(), allocator, ctx.backend.backend(), .{ .theme = theme });
-    errdefer ctx.window.deinit();
-
-    return ctx;
-}
-
-fn closeWindow(windows: *std.ArrayList(*WindowContext), allocator: std.mem.Allocator, idx: usize) void {
-    const last = windows.items.len == 1;
-    const ctx = windows.swapRemove(idx);
-    ctx.deinit(allocator, last);
-    allocator.destroy(ctx);
-}
-
-fn destroyBackendKeepingSDL(backend: *SDLBackend) void {
-    SDLBackend.c.SDL_DestroyRenderer(backend.renderer);
-    SDLBackend.c.SDL_DestroyWindow(backend.window);
-    backend.we_own_window = false;
-    backend.deinit();
-}
-
-fn windowId(ctx: *WindowContext) u32 {
-    return @intCast(SDLBackend.c.SDL_GetWindowID(ctx.backend.window));
-}
-
-fn eventWindowId(event: SDLBackend.c.SDL_Event) ?u32 {
-    return switch (event.type) {
-        if (SDLBackend.sdl3) SDLBackend.c.SDL_EVENT_KEY_DOWN else SDLBackend.c.SDL_KEYDOWN => @intCast(event.key.windowID),
-        if (SDLBackend.sdl3) SDLBackend.c.SDL_EVENT_KEY_UP else SDLBackend.c.SDL_KEYUP => @intCast(event.key.windowID),
-        if (SDLBackend.sdl3) SDLBackend.c.SDL_EVENT_TEXT_INPUT else SDLBackend.c.SDL_TEXTINPUT => @intCast(event.text.windowID),
-        if (SDLBackend.sdl3) SDLBackend.c.SDL_EVENT_TEXT_EDITING else SDLBackend.c.SDL_TEXTEDITING => @intCast(event.edit.windowID),
-        if (SDLBackend.sdl3) SDLBackend.c.SDL_EVENT_MOUSE_MOTION else SDLBackend.c.SDL_MOUSEMOTION => @intCast(event.motion.windowID),
-        if (SDLBackend.sdl3) SDLBackend.c.SDL_EVENT_MOUSE_BUTTON_DOWN else SDLBackend.c.SDL_MOUSEBUTTONDOWN => @intCast(event.button.windowID),
-        if (SDLBackend.sdl3) SDLBackend.c.SDL_EVENT_MOUSE_BUTTON_UP else SDLBackend.c.SDL_MOUSEBUTTONUP => @intCast(event.button.windowID),
-        if (SDLBackend.sdl3) SDLBackend.c.SDL_EVENT_MOUSE_WHEEL else SDLBackend.c.SDL_MOUSEWHEEL => @intCast(event.wheel.windowID),
-        if (SDLBackend.sdl3) SDLBackend.c.SDL_EVENT_WINDOW_CLOSE_REQUESTED else SDLBackend.c.SDL_WINDOWEVENT => @intCast(event.window.windowID),
-        else => null,
-    };
-}
-
-fn pumpEvents(windows: *std.ArrayList(*WindowContext)) !bool {
-    var event: SDLBackend.c.SDL_Event = undefined;
-    const poll_got_event = if (SDLBackend.sdl3) true else 1;
-    var saw_event = false;
-
-    while (SDLBackend.c.SDL_PollEvent(&event) == poll_got_event) {
-        saw_event = true;
-
-        if (eventWindowId(event)) |wid| {
-            for (windows.items) |ctx| {
-                if (windowId(ctx) == wid) {
-                    _ = try ctx.backend.addEvent(&ctx.window, event);
-                    break;
-                }
-            }
-        } else {
-            // broadcast events without a window target (like SDL_QUIT)
-            for (windows.items) |ctx| {
-                _ = try ctx.backend.addEvent(&ctx.window, event);
-            }
-        }
-    }
-
-    return saw_event;
-}
-
-fn gui_frame(ctx: *WindowContext, allocator: std.mem.Allocator, windows: *std.ArrayList(*WindowContext), next_window_id: *usize) !bool {
-    for (ctx.window.events.items) |*e| {
+fn gui_frame(ctx: *WindowContext) bool {
+    for (dvui.events()) |*e| {
         if (e.evt == .window and e.evt.window.action == .close) return false;
-        // Treat SDL_QUIT as a global request; ignore here so other windows keep running.
+        if (e.evt == .app and e.evt.app.action == .quit) return false;
     }
 
-    var root = dvui.box(@src(), .{ .dir = .vertical }, .{ .expand = .both, .padding = dvui.Rect.all(12), .background = true, .style = .window });
+    const root = dvui.box(
+        @src(),
+        .{ .dir = .horizontal },
+        .{ .expand = .both, .background = true, .style = .window },
+    );
     defer root.deinit();
 
-    dvui.label(@src(), "Window #{d}", .{ctx.id}, .{ .font_style = .title_2 });
-    dvui.label(@src(), "Open windows: {d}", .{windows.items.len}, .{});
-
-    if (dvui.button(@src(), "New window", .{}, .{})) {
-        const id = next_window_id.*;
-        next_window_id.* += 1;
-        const new_ctx = try createWindow(allocator, id);
-        try windows.append(allocator, new_ctx);
+    // Левая панель с фиксированной шириной
+    var left_panel = dvui.box(@src(), .{ .dir = .vertical }, .{ .expand = .vertical, .min_size_content = .{ .w = 200 }, .background = true });
+    {
+        dvui.label(@src(), "Tools", .{}, .{});
+        if (dvui.button(@src(), "Fill Random Color", .{}, .{})) {
+            ctx.fillRandomColor() catch |err| {
+                std.debug.print("Error filling canvas: {}\n", .{err});
+            };
+            ctx.canvas_pos = .{ .x = 400, .y = 400 };
+        }
     }
+    left_panel.deinit();
+
+    // Правая панель - занимает оставшееся пространство
+    const back = dvui.box(
+        @src(),
+        .{ .dir = .horizontal },
+        .{ .expand = .both, .padding = dvui.Rect.all(12), .background = true },
+    );
+    {
+        const fill_color = Color.white.opacity(0.5);
+        var right_panel = dvui.box(
+            @src(),
+            .{ .dir = .vertical },
+            .{
+                .expand = .both,
+                .background = true,
+                .padding = dvui.Rect.all(5),
+                .corner_radius = dvui.Rect.all(24),
+                .color_fill = fill_color,
+            },
+        );
+        {
+            var textured = dvui_ext.texturedBox(right_panel.data().contentRectScale(), dvui.Rect.all(20));
+            {
+                var canvas_box = dvui.box(
+                    @src(),
+                    .{ .dir = .vertical },
+                    .{ .expand = .both },
+                );
+                {
+                    dvui.label(@src(), "Canvas", .{}, .{ .gravity_x = 0.5, .gravity_y = 0.0 });
+
+                    var scroll = dvui.scrollArea(
+                        @src(),
+                        .{
+                            .scroll_info = &ctx.canvas_scroll,
+                            .vertical_bar = .auto,
+                            .horizontal_bar = .auto,
+                        },
+                        .{ .expand = .both, .background = false },
+                    );
+                    {
+                        // Отобразить canvas внутри scroll area.
+                        // ScrollArea сам двигает дочерние виджеты, поэтому margin не нужен.
+                        if (ctx.canvas_texture) |texture| {
+                            _ = dvui.image(@src(), .{
+                                .source = .{ .texture = texture },
+                            }, .{
+                                .margin = .{ .x = ctx.canvas_pos.x, .y = ctx.canvas_pos.y },
+                                .min_size_content = .{
+                                    .w = @floatFromInt(ctx.canvas_width),
+                                    .h = @floatFromInt(ctx.canvas_height),
+                                },
+                            });
+                        }
+                    }
+                    scroll.deinit();
+                }
+                canvas_box.deinit();
+            }
+            textured.deinit();
+        }
+        right_panel.deinit();
+    }
+    back.deinit();
 
     return true;
 }

src/render/IRenderEngine.zig

@@ -0,0 +1 @@
+// Интерфейс для рендеринга документа

src/ui/dvui_ext.zig

@@ -0,0 +1,8 @@
+// Расширения для dvui
+const std = @import("std");
+const dvui = @import("dvui");
+const TexturedBox = @import("./types/TexturedBox.zig");
+
+pub fn texturedBox(rs: dvui.RectScale, corner_radius: dvui.Rect) TexturedBox {
+    return TexturedBox.init(rs, corner_radius);
+}

src/ui/types/TexturedBox.zig

@@ -0,0 +1,38 @@
+// Отрисовка дочернего контента как текстуры с параметрами скругления
+const std = @import("std");
+const dvui = @import("dvui");
+const TexturedBox = @This();
+
+parent: dvui.Widget,
+rs: dvui.RectScale,
+pic: ?dvui.Picture,
+corner_radius: dvui.Rect,
+
+pub fn init(rs: dvui.RectScale, corner_radius: dvui.Rect) TexturedBox {
+    const parent = dvui.parentGet();
+    const pic = dvui.Picture.start(rs.r);
+    return .{
+        .parent = parent,
+        .corner_radius = corner_radius,
+        .rs = rs,
+        .pic = pic,
+    };
+}
+
+pub fn deinit(self: *TexturedBox) void {
+    if (self.pic) |*picture| {
+        picture.stop();
+
+        const tex = dvui.textureFromTarget(picture.texture) catch null;
+        if (tex) |t| {
+            dvui.Texture.destroyLater(t);
+            // self.rs.r.y -= 2;
+            // self.rs.r.x -= 2;
+            // self.rs.r.h += 2;
+            // self.rs.r.w += 2;
+            dvui.renderTexture(t, self.rs, .{
+                .corner_radius = self.corner_radius,
+            }) catch {};
+        }
+    }
+}