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      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_
     41