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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_THEME_HELPER_MAC_H_
#define CONTENT_BROWSER_THEME_HELPER_MAC_H_
#include "base/containers/span.h"
#include "base/macros.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/writable_shared_memory_region.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "third_party/blink/public/common/sandbox_support/sandbox_support_mac.h"
#include "third_party/blink/public/platform/mac/web_scrollbar_theme.h"
#include "third_party/skia/include/core/SkColor.h"
#if __OBJC__
@class SystemThemeObserver;
#else
class SystemThemeObserver;
#endif
namespace content {
// This class is used to monitor macOS system appearance changes and to notify
// sandboxed child processes when they change. This class lives on the UI
// thread.
class ThemeHelperMac : public NotificationObserver {
public:
// Return pointer to the singleton instance for the current process, or NULL
// if none.
static ThemeHelperMac* GetInstance();
// Duplicates a handle to the read-only copy of the system color table,
// which can be shared to sandboxed child processes.
base::ReadOnlySharedMemoryRegion DuplicateReadOnlyColorMapRegion();
private:
ThemeHelperMac();
~ThemeHelperMac() override;
// Looks up the blink::MacSystemColorID corresponding to the NSColor
// selector and stores them in the |writable_color_map_| table. Looks up
// colors for both light and dark appearances.
void LoadSystemColors();
// Looks up system colors for the current appearance, either a light or
// dark appearance and stores them in values. The values parameter is the part
// of writable_color_map_ where the colors for the current appearance should
// be stored.
void LoadSystemColorsForCurrentAppearance(base::span<SkColor> values);
// Overridden from NotificationObserver:
void Observe(int type,
const NotificationSource& source,
const NotificationDetails& details) override;
// ObjC object that observes notifications from the system.
SystemThemeObserver* theme_observer_; // strong
// Writable and mapped array of SkColor values, indexed by MacSystemColorID
// for a light appearance. Colors for a dark appearance in indexed by
// MacSystemColorID starting at index MacSystemColorID::kCount.
base::WritableSharedMemoryMapping writable_color_map_;
// Read-only handle to the |writable_color_map_| that can be duplicated for
// sharing to child processes.
base::ReadOnlySharedMemoryRegion read_only_color_map_;
NotificationRegistrar registrar_;
DISALLOW_COPY_AND_ASSIGN(ThemeHelperMac);
};
} // namespace content
#endif // CONTENT_BROWSER_THEME_HELPER_MAC_H_
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