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// Copyright (c) 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 "content/browser/renderer_host/touch_smooth_scroll_gesture_android.h"
#include "base/debug/trace_event.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "jni/SmoothScroller_jni.h"
namespace {
bool g_jni_initialized = false;
void RegisterNativesIfNeeded(JNIEnv* env) {
if (!g_jni_initialized) {
content::RegisterNativesImpl(env);
g_jni_initialized = true;
}
}
} // namespace
namespace content {
TouchSmoothScrollGestureAndroid::TouchSmoothScrollGestureAndroid(
int pixels_to_scroll,
RenderWidgetHost* rwh,
base::android::ScopedJavaLocalRef<jobject> java_scroller)
: pixels_scrolled_(0),
has_started_(false),
has_sent_motion_up_(false),
pixels_to_scroll_(pixels_to_scroll),
rwh_(rwh),
java_scroller_(java_scroller) {
JNIEnv* env = base::android::AttachCurrentThread();
RegisterNativesIfNeeded(env);
}
TouchSmoothScrollGestureAndroid::~TouchSmoothScrollGestureAndroid() {
}
bool TouchSmoothScrollGestureAndroid::ForwardInputEvents(
base::TimeTicks now, RenderWidgetHost* host) {
if (!has_started_) {
has_started_ = true;
JNIEnv* env = base::android::AttachCurrentThread();
Java_SmoothScroller_start(
env, java_scroller_.obj(), reinterpret_cast<int>(this));
}
TRACE_COUNTER_ID1(
"gpu", "smooth_scroll_by_pixels_scrolled", this, pixels_scrolled_);
return !has_sent_motion_up_;
}
double TouchSmoothScrollGestureAndroid::GetScrollDelta(
JNIEnv* env, jobject obj, double scale) {
double delta = smooth_scroll_calculator_.GetScrollDelta(
base::TimeTicks::Now(),
RenderWidgetHostImpl::From(rwh_)->GetSyntheticScrollMessageInterval())
* scale;
pixels_scrolled_ += delta;
return delta;
}
bool TouchSmoothScrollGestureAndroid::HasFinished(JNIEnv* env, jobject obj) {
return pixels_scrolled_ >= pixels_to_scroll_;
}
void TouchSmoothScrollGestureAndroid::SetHasSentMotionUp(
JNIEnv* env, jobject obj) {
has_sent_motion_up_ = true;
}
} // namespace content
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