chrome/browser/android/transition_page_helper.cc

   1 // Copyright 2015 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 #include "chrome/browser/android/transition_page_helper.h"
   6
   7 #include "cc/layers/layer.h"
   8 #include "chrome/browser/android/tab_android.h"
   9 #include "chrome/browser/ui/android/window_android_helper.h"
  10 #include "content/public/browser/android/content_view_core.h"
  11 #include "content/public/browser/web_contents.h"
  12 #include "jni/TransitionPageHelper_jni.h"
  13
  14 // TODO(simonhatch): Why does 1.f opacity seem to kill per-pixel alpha?
  15 const float TRANSITION_MAX_OPACITY = 0.99999f;
  16
  17 TransitionPageHelper* TransitionPageHelper::FromJavaObject(JNIEnv* env,
  18                                                            jobject jobj) {
  19   return reinterpret_cast<TransitionPageHelper*>(
  20       Java_TransitionPageHelper_getNativePtr(env, jobj));
  21 }
  22
  23 TransitionPageHelper::TransitionPageHelper() {
  24 }
  25
  26 TransitionPageHelper::~TransitionPageHelper() {
  27 }
  28
  29 void TransitionPageHelper::Destroy(JNIEnv* env, jobject jobj) {
  30   delete this;
  31 }
  32
  33 void TransitionPageHelper::SetWebContents(JNIEnv* env,
  34                                           jobject jobj,
  35                                           jobject jcontent_view_core) {
  36   content::ContentViewCore* content_view_core =
  37       content::ContentViewCore::GetNativeContentViewCore(env,
  38                                                          jcontent_view_core);
  39   DCHECK(content_view_core);
  40   DCHECK(content_view_core->GetWebContents());
  41
  42   web_contents_.reset(content_view_core->GetWebContents());
  43 }
  44
  45 void TransitionPageHelper::ReleaseWebContents(JNIEnv* env, jobject jobj) {
  46   DCHECK(web_contents_.get());
  47   web_contents_.reset();
  48 }
  49
  50 void TransitionPageHelper::SetOpacity(JNIEnv* env,
  51                                       jobject jobj,
  52                                       jobject jcontent_view_core,
  53                                       jfloat opacity) {
  54   content::ContentViewCore* content_view_core =
  55       content::ContentViewCore::GetNativeContentViewCore(env,
  56                                                          jcontent_view_core);
  57   if (!content_view_core)
  58     return;
  59
  60   content_view_core->GetLayer()->SetOpacity(
  61       std::min(opacity, TRANSITION_MAX_OPACITY));
  62 }
  63
  64 static jlong Init(JNIEnv* env, jobject obj) {
  65   return reinterpret_cast<long>(new TransitionPageHelper());
  66 }
  67
  68 bool TransitionPageHelper::Register(JNIEnv* env) {
  69   return RegisterNativesImpl(env);
  70 }