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// Copyright (c) 2012 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 "webkit/glue/fling_animator_impl_android.h"
#include "base/android/jni_android.h"
#include "base/android/scoped_java_ref.h"
#include "base/logging.h"
using base::android::AttachCurrentThread;
using base::android::CheckException;
using base::android::GetApplicationContext;
using base::android::GetClass;
using base::android::MethodID;
using base::android::ScopedJavaLocalRef;
namespace webkit_glue {
FlingAnimatorImpl::FlingAnimatorImpl()
: is_active_(false) {
// hold the global reference of the Java objects.
JNIEnv* env = AttachCurrentThread();
DCHECK(env);
ScopedJavaLocalRef<jclass> cls(GetClass(env, "android/widget/OverScroller"));
jmethodID constructor = MethodID::Get<MethodID::TYPE_INSTANCE>(
env, cls.obj(), "<init>", "(Landroid/content/Context;)V");
ScopedJavaLocalRef<jobject> tmp(env, env->NewObject(cls.obj(), constructor,
GetApplicationContext()));
DCHECK(tmp.obj());
java_scroller_.Reset(tmp);
fling_method_id_ = MethodID::Get<MethodID::TYPE_INSTANCE>(
env, cls.obj(), "fling", "(IIIIIIII)V");
abort_method_id_ = MethodID::Get<MethodID::TYPE_INSTANCE>(
env, cls.obj(), "abortAnimation", "()V");
compute_method_id_ = MethodID::Get<MethodID::TYPE_INSTANCE>(
env, cls.obj(), "computeScrollOffset", "()Z");
getX_method_id_ = MethodID::Get<MethodID::TYPE_INSTANCE>(
env, cls.obj(), "getCurrX", "()I");
getY_method_id_ = MethodID::Get<MethodID::TYPE_INSTANCE>(
env, cls.obj(), "getCurrY", "()I");
}
FlingAnimatorImpl::~FlingAnimatorImpl()
{
}
void FlingAnimatorImpl::startFling(const WebKit::WebFloatPoint& velocity,
const WebKit::WebRect& /* range */)
{
// Ignore "range" as it's always empty -- see http://webkit.org/b/96403
// Instead, use the largest possible bounds for minX/maxX/minY/maxY. The
// compositor will ignore any attempt to scroll beyond the end of the page.
DCHECK(velocity.x || velocity.y);
if (is_active_)
cancelFling();
is_active_ = true;
JNIEnv* env = AttachCurrentThread();
env->CallVoidMethod(java_scroller_.obj(), fling_method_id_, 0, 0,
static_cast<int>(velocity.x),
static_cast<int>(velocity.y),
INT_MIN, INT_MAX, INT_MIN, INT_MAX);
CheckException(env);
}
void FlingAnimatorImpl::cancelFling()
{
if (!is_active_)
return;
is_active_ = false;
JNIEnv* env = AttachCurrentThread();
env->CallVoidMethod(java_scroller_.obj(), abort_method_id_);
CheckException(env);
}
bool FlingAnimatorImpl::updatePosition()
{
JNIEnv* env = AttachCurrentThread();
bool result = env->CallBooleanMethod(java_scroller_.obj(),
compute_method_id_);
CheckException(env);
return is_active_ = result;
}
WebKit::WebPoint FlingAnimatorImpl::getCurrentPosition()
{
JNIEnv* env = AttachCurrentThread();
WebKit::WebPoint position(
env->CallIntMethod(java_scroller_.obj(), getX_method_id_),
env->CallIntMethod(java_scroller_.obj(), getY_method_id_));
CheckException(env);
return position;
}
} // namespace webkit_glue
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