HeadlessLookAndFeel.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_widget_HeadlessLookAndFeel_h

#define mozilla_widget_HeadlessLookAndFeel_h

#include "nsXPLookAndFeel.h"

#include "nsLookAndFeel.h"

namespace mozilla {

namespace widget {

#if defined(MOZ_WIDGET_GTK)

// Our nsLookAndFeel for Gtk relies on APIs that aren't available in headless

// mode, so for processes that are unable to connect to a display server, we use

// an implementation with hardcoded values.

//

// HeadlessLookAndFeel is used:

//

//   * in the parent process, when full headless mode (MOZ_HEADLESS=1) is

//     enabled

//

// The result of this is that when headless content mode is enabled, content

// processes use values derived from the parent's nsLookAndFeel (i.e., values

// derived from Gtk APIs) while still refraining from making any display server

// connections.

class HeadlessLookAndFeel : public nsXPLookAndFeel {

 public:

  explicit HeadlessLookAndFeel();

  virtual ~HeadlessLookAndFeel();

  void NativeInit() final{};

  nsresult NativeGetInt(IntID, int32_t& aResult) override;

  nsresult NativeGetFloat(FloatID, float& aResult) override;

  nsresult NativeGetColor(ColorID, ColorScheme, nscolor& aResult) override;

  bool NativeGetFont(FontID, nsString& aFontName, gfxFontStyle&) override;

  char16_t GetPasswordCharacterImpl() override;

};

#else

// When possible, we simply reuse the platform's existing nsLookAndFeel

// implementation in headless mode.

typedef nsLookAndFeel HeadlessLookAndFeel;

#endif

}  // namespace widget

}  // namespace mozilla

#endif