[Tracking Patch] Unified gesture detection

ui/gfx/android/view_configuration.cc

 // Copyright 2013 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.
 
 #include "ui/gfx/android/view_configuration.h"
 
 #include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/lazy_instance.h"
+#include "jni/ResourcesHelper_jni.h"
 #include "jni/ViewConfiguration_jni.h"
 
-using namespace JNI_ViewConfiguration;
 using base::android::AttachCurrentThread;
 using base::android::GetApplicationContext;
 
 namespace gfx {
+namespace {
+struct ViewConfigurationData {
+  ViewConfigurationData() {
+    using namespace JNI_ViewConfiguration;
+
+    JNIEnv* env = AttachCurrentThread();
+
+    double_tap_timeout_in_ms = Java_ViewConfiguration_getDoubleTapTimeout(env);
+    long_press_timeout_in_ms = Java_ViewConfiguration_getLongPressTimeout(env);
+    tap_timeout_in_ms = Java_ViewConfiguration_getTapTimeout(env);
+
+    ScopedJavaLocalRef<jobject> view =
+        Java_ViewConfiguration_get(env, GetApplicationContext());
+
+    max_fling_velocity_in_pixels_s =
+        Java_ViewConfiguration_getScaledMaximumFlingVelocity(env, view.obj());
+    min_fling_velocity_in_pixels_s =
+        Java_ViewConfiguration_getScaledMinimumFlingVelocity(env, view.obj());
+
+    touch_slop_in_pixels =
+        Java_ViewConfiguration_getScaledTouchSlop(env, view.obj());
+    double_tap_slop_in_pixels =
+        Java_ViewConfiguration_getScaledDoubleTapSlop(env, view.obj());
+
+    ScopedJavaLocalRef<jstring> jidentifier =
+        base::android::ConvertUTF8ToJavaString(env, "config_minScalingSpan");
+    min_scaling_span_in_pixels =
+        Java_ResourcesHelper_getDimensionPixelSize(env, jidentifier.obj());
+
+    jidentifier = base::android::ConvertUTF8ToJavaString(
+        env, "config_minScalingTouchMajor");
+    min_scaling_touch_major_in_pixels =
+        Java_ResourcesHelper_getDimensionPixelSize(env, jidentifier.obj());
+  }
+
+  int double_tap_timeout_in_ms;
+  int long_press_timeout_in_ms;
+  int tap_timeout_in_ms;
+  int max_fling_velocity_in_pixels_s;
+  int min_fling_velocity_in_pixels_s;
+  int touch_slop_in_pixels;
+  int double_tap_slop_in_pixels;
+  int min_scaling_span_in_pixels;
+  int min_scaling_touch_major_in_pixels;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ViewConfigurationData);
+};
+
+base::LazyInstance<ViewConfigurationData> g_view_configuration =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
 
 int ViewConfiguration::GetDoubleTapTimeoutInMs() {
-  JNIEnv* env = AttachCurrentThread();
-  return Java_ViewConfiguration_getDoubleTapTimeout(env);
+  return g_view_configuration.Get().double_tap_timeout_in_ms;
 }
 
 int ViewConfiguration::GetLongPressTimeoutInMs() {
-  JNIEnv* env = AttachCurrentThread();
-  return Java_ViewConfiguration_getLongPressTimeout(env);
+  return g_view_configuration.Get().long_press_timeout_in_ms;
 }
 
 int ViewConfiguration::GetTapTimeoutInMs() {
-  JNIEnv* env = AttachCurrentThread();
-  return Java_ViewConfiguration_getTapTimeout(env);
+  return g_view_configuration.Get().tap_timeout_in_ms;
 }
 
 int ViewConfiguration::GetMaximumFlingVelocityInPixelsPerSecond() {
-  JNIEnv* env = AttachCurrentThread();
-  ScopedJavaLocalRef<jobject> view =
-      Java_ViewConfiguration_get(env, GetApplicationContext());
-  return Java_ViewConfiguration_getScaledMaximumFlingVelocity(env, view.obj());
+  return g_view_configuration.Get().max_fling_velocity_in_pixels_s;
 }
 
 int ViewConfiguration::GetMinimumFlingVelocityInPixelsPerSecond() {
-  JNIEnv* env = AttachCurrentThread();
-  ScopedJavaLocalRef<jobject> view =
-      Java_ViewConfiguration_get(env, GetApplicationContext());
-  return Java_ViewConfiguration_getScaledMinimumFlingVelocity(env, view.obj());
+  return g_view_configuration.Get().min_fling_velocity_in_pixels_s;
 }
 
 int ViewConfiguration::GetTouchSlopInPixels() {
-  JNIEnv* env = AttachCurrentThread();
-  ScopedJavaLocalRef<jobject> view =
-      Java_ViewConfiguration_get(env, GetApplicationContext());
-  return Java_ViewConfiguration_getScaledTouchSlop(env, view.obj());
+  return g_view_configuration.Get().touch_slop_in_pixels;
+}
+
+int ViewConfiguration::GetDoubleTapSlopInPixels() {
+  return g_view_configuration.Get().double_tap_slop_in_pixels;
+}
+
+int ViewConfiguration::GetMinScalingSpanInPixels() {
+  return g_view_configuration.Get().min_scaling_span_in_pixels;
+}
+
+int ViewConfiguration::GetMinScalingTouchMajorInPixels() {
+  return g_view_configuration.Get().min_scaling_touch_major_in_pixels;
 }
 
 bool ViewConfiguration::RegisterViewConfiguration(JNIEnv* env) {
-  return RegisterNativesImpl(env);
+  return JNI_ViewConfiguration::RegisterNativesImpl(env) &&
+         RegisterNativesImpl(env);
 }
 
 }  // namespace gfx