ui/base/ui_base_features.h

// Copyright 2017 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 UI_BASE_UI_BASE_FEATURES_H_
#define UI_BASE_UI_BASE_FEATURES_H_

#include "base/component_export.h"
#include "base/feature_list.h"
#include "build/build_config.h"
#include "ui/base/buildflags.h"

namespace features {

// Keep sorted!

COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kCompositorThreadedScrollbarScrolling;
#if defined(OS_CHROMEOS)
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kSettingsShowsPerKeyboardSettings;
#endif  // defined(OS_CHROMEOS)
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kInputMethodSettingsUiUpdate;
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kSystemCaptionStyle;
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kSystemKeyboardLock;
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kNotificationIndicator;
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kUiCompositorScrollWithLayers;

COMPONENT_EXPORT(UI_BASE_FEATURES) bool IsNotificationIndicatorEnabled();

COMPONENT_EXPORT(UI_BASE_FEATURES) bool IsUiGpuRasterizationEnabled();

#if defined(OS_WIN)
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kCalculateNativeWinOcclusion;
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kInputPaneOnScreenKeyboard;
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kPointerEventsForTouch;
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kPrecisionTouchpad;
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kPrecisionTouchpadLogging;
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kPrecisionTouchpadScrollPhase;
COMPONENT_EXPORT(UI_BASE_FEATURES) extern const base::Feature kTSFImeSupport;

// Returns true if the system should use WM_POINTER events for touch events.
COMPONENT_EXPORT(UI_BASE_FEATURES) bool IsUsingWMPointerForTouch();
#endif  // defined(OS_WIN)

#if defined(OS_WIN) || defined(OS_CHROMEOS)
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kEnableAutomaticUiAdjustmentsForTouch;
#endif  // defined(OS_WIN) || defined(OS_CHROMEOS)

#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kDirectManipulationStylus;
#endif  // defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)

// Used to have ash (Chrome OS system UI) run in its own process.
// TODO(jamescook): Make flag only available in Chrome OS.
COMPONENT_EXPORT(UI_BASE_FEATURES) extern const base::Feature kMash;

// Used to run Viz in its own process when kMash is enabled. Viz is run in Ash
// process by default.
// TODO(mohsen): Remove this when Viz can run fully in a separate process. Then
// make it the default kMash behavior.
COMPONENT_EXPORT(UI_BASE_FEATURES) extern const base::Feature kMashOopViz;

// NOTE: Do not access directly outside of tests. Use IsSingleProcessMash()
// to avoid problems when Mash and SingleProcessMash are both enabled.
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kSingleProcessMash;

#if defined(OS_CHROMEOS)
COMPONENT_EXPORT(UI_BASE_FEATURES) extern const base::Feature kMojoIMF;
#endif

// Returns true if Chrome's aura usage is backed by the WindowService.
COMPONENT_EXPORT(UI_BASE_FEATURES) bool IsUsingWindowService();

// Returns true if ash in running in a separate process (and is hosting the UI
// service and Viz graphics). See //ash/README.md.
COMPONENT_EXPORT(UI_BASE_FEATURES) bool IsMultiProcessMash();

COMPONENT_EXPORT(UI_BASE_FEATURES) bool IsMashOopVizEnabled();

// Returns true if code outside of ash is using the WindowService. In this mode
// there are two aura::Envs. Ash uses one with Env::Mode::LOCAL. Non-ash code
// uses an aura::Env with a mode of MUS. The non-ash code using mus targets the
// WindowService that ash is running. This exercises the WindowService mojo APIs
// similar to kMash, but leaves ash and browser running in the same process.
// See //ash/README.md.
COMPONENT_EXPORT(UI_BASE_FEATURES) bool IsSingleProcessMash();

// Returns true if the client connects the active ime engine through mojo IPCs.
// This can only return true on Chrome OS, and it can only take effect when
// IsSingleProcessMash() returns true.
COMPONENT_EXPORT(UI_BASE_FEATURES) bool IsMojoImfEnabled();

// Whether the UI may accommodate touch input in response to hardware changes.
COMPONENT_EXPORT(UI_BASE_FEATURES)
bool IsAutomaticUiAdjustmentsForTouchEnabled();

#if defined(OS_MACOSX)
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kHostWindowsInAppShimProcess;

// Returns true if the NSWindows for apps will be created in the app's process,
// and will forward input to the browser process.
COMPONENT_EXPORT(UI_BASE_FEATURES) bool HostWindowsInAppShimProcess();
#endif  //  defined(OS_MACOSX)

// Use mojo communication in the drm platform instead of paramtraits. Remove
// this switch (and associated code) when the drm platform always uses mojo
// communication.
// TODO(rjkroege): Remove in http://crbug.com/806092.
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kEnableOzoneDrmMojo;
COMPONENT_EXPORT(UI_BASE_FEATURES) bool IsOzoneDrmMojo();

// Whether default UI should use a dark mode color scheme, if enabled on
// macOS Mojave/Windows 10.
COMPONENT_EXPORT(UI_BASE_FEATURES) extern const base::Feature kDarkMode;

#if defined(OS_CHROMEOS)
COMPONENT_EXPORT(UI_BASE_FEATURES)
extern const base::Feature kHandwritingGesture;
#endif
}  // namespace features

#endif  // UI_BASE_UI_BASE_FEATURES_H_