widget/headless/HeadlessLookAndFeel.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_widget_HeadlessLookAndFeel_h
   8 #define mozilla_widget_HeadlessLookAndFeel_h
   9
  10 #include "nsXPLookAndFeel.h"
  11 #include "nsLookAndFeel.h"
  12
  13 namespace mozilla {
  14 namespace widget {
  15
  16 #if defined(MOZ_WIDGET_GTK)
  17
  18 // Our nsLookAndFeel for Gtk relies on APIs that aren't available in headless
  19 // mode, so for processes that are unable to connect to a display server, we use
  20 // an implementation with hardcoded values.
  21 //
  22 // HeadlessLookAndFeel is used:
  23 //
  24 //   * in the parent process, when full headless mode (MOZ_HEADLESS=1) is
  25 //     enabled
  26 //
  27 // The result of this is that when headless content mode is enabled, content
  28 // processes use values derived from the parent's nsLookAndFeel (i.e., values
  29 // derived from Gtk APIs) while still refraining from making any display server
  30 // connections.
  31
  32 class HeadlessLookAndFeel : public nsXPLookAndFeel {
  33  public:
  34   explicit HeadlessLookAndFeel();
  35   virtual ~HeadlessLookAndFeel();
  36
  37   void NativeInit() final {};
  38   nsresult NativeGetInt(IntID, int32_t& aResult) override;
  39   nsresult NativeGetFloat(FloatID, float& aResult) override;
  40   nsresult NativeGetColor(ColorID, ColorScheme, nscolor& aResult) override;
  41   bool NativeGetFont(FontID, nsString& aFontName, gfxFontStyle&) override;
  42
  43   char16_t GetPasswordCharacterImpl() override;
  44 };
  45
  46 #else
  47
  48 // When possible, we simply reuse the platform's existing nsLookAndFeel
  49 // implementation in headless mode.
  50
  51 typedef nsLookAndFeel HeadlessLookAndFeel;
  52
  53 #endif
  54
  55 }  // namespace widget
  56 }  // namespace mozilla
  57
  58 #endif