Everywhere: Move the Ladybird folder to UI

Author: https://github.com/trflynn89
Commit: db47cc41f8
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

UI/AppKit/Interface/Palette.mm

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/ByteString.h>
+#include <LibCore/Resource.h>
+#include <LibGfx/Palette.h>
+#include <LibGfx/SystemTheme.h>
+#include <UI/Utilities.h>
+
+#import <Cocoa/Cocoa.h>
+#import <Interface/Palette.h>
+#import <Utilities/Conversions.h>
+
+namespace Ladybird {
+
+bool is_using_dark_system_theme()
+{
+    auto* appearance = [NSApp effectiveAppearance];
+
+    auto* matched_appearance = [appearance bestMatchFromAppearancesWithNames:@[
+        NSAppearanceNameAqua,
+        NSAppearanceNameDarkAqua,
+    ]];
+
+    return [matched_appearance isEqualToString:NSAppearanceNameDarkAqua];
+}
+
+Core::AnonymousBuffer create_system_palette()
+{
+    auto is_dark = is_using_dark_system_theme();
+
+    auto theme_file = is_dark ? "Dark"sv : "Default"sv;
+    auto theme_ini = MUST(Core::Resource::load_from_uri(MUST(String::formatted("resource://themes/{}.ini", theme_file))));
+    auto theme = Gfx::load_system_theme(theme_ini->filesystem_path().to_byte_string()).release_value_but_fixme_should_propagate_errors();
+
+    auto palette_impl = Gfx::PaletteImpl::create_with_anonymous_buffer(theme);
+    auto palette = Gfx::Palette(move(palette_impl));
+    palette.set_flag(Gfx::FlagRole::IsDark, is_dark);
+    palette.set_color(Gfx::ColorRole::Accent, ns_color_to_gfx_color([NSColor controlAccentColor]));
+    // FIXME: There are more system colors we currently don't use (https://developer.apple.com/documentation/appkit/nscolor/3000782-controlaccentcolor?language=objc)
+
+    return theme;
+}
+
+}