ui/gfx/android/view_configuration.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_GFX_ANDROID_VIEW_CONFIGURATION_H_
   6 #define UI_GFX_ANDROID_VIEW_CONFIGURATION_H_
   7
   8 #include <jni.h>
   9
  10 #include "ui/gfx/gfx_export.h"
  11
  12 namespace gfx {
  13
  14 // Provides access to Android's ViewConfiguration for gesture-related constants.
  15 // Note: All methods may be safely called from any thread.
  16 class GFX_EXPORT ViewConfiguration {
  17  public:
  18   static int GetDoubleTapTimeoutInMs();
  19   static int GetLongPressTimeoutInMs();
  20   static int GetTapTimeoutInMs();
  21
  22   // Dimensionless coefficient of friction.
  23   static float GetScrollFriction();
  24
  25   static int GetMaximumFlingVelocityInPixelsPerSecond();
  26   static int GetMinimumFlingVelocityInPixelsPerSecond();
  27
  28   static int GetTouchSlopInPixels();
  29   static int GetDoubleTapSlopInPixels();
  30
  31   static int GetMinScalingSpanInPixels();
  32   static int GetMinScalingTouchMajorInPixels();
  33
  34   // Registers methods with JNI and returns true if succeeded.
  35   static bool RegisterViewConfiguration(JNIEnv* env);
  36 };
  37
  38 }  // namespace gfx
  39
  40 #endif  // UI_GFX_ANDROID_VIEW_CONFIGURATION_H_