Refactor the Android port to allow access to the chrome layer.

chrome/browser/component/web_contents_delegate_android/web_contents_delegate_android.cc

+// 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 "chrome/browser/component/web_contents_delegate_android/web_contents_delegate_android.h"
+
+#include <android/keycodes.h>
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "content/public/browser/render_widget_host_view.h"
+#include "content/public/browser/download_item.h"
+#include "content/public/browser/invalidate_type.h"
+#include "content/public/browser/page_navigator.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/common/page_transition_types.h"
+#include "content/public/common/referrer.h"
+#include "jni/WebContentsDelegateAndroid_jni.h"
+#include "net/http/http_request_headers.h"
+#include "ui/gfx/rect.h"
+#include "webkit/glue/window_open_disposition.h"
+
+using base::android::AttachCurrentThread;
+using base::android::CheckException;
+using base::android::ConvertUTF8ToJavaString;
+using base::android::ConvertUTF16ToJavaString;
+using base::android::GetClass;
+using base::android::GetMethodID;
+using base::android::HasClass;
+using base::android::ScopedJavaLocalRef;
+using content::DownloadItem;
+using content::JavaScriptDialogCreator;
+using content::RenderViewHost;
+using content::WebContents;
+
+namespace chrome {
+namespace component {
+namespace web_contents_delegate_android {
+
+WebContentsDelegateAndroid::WebContentsDelegateAndroid(JNIEnv* env, jobject obj)
+    : weak_java_delegate_(env, obj),
+      javascript_dialog_creator_(NULL) {
+}
+
+WebContentsDelegateAndroid::~WebContentsDelegateAndroid() {
+}
+
+ScopedJavaLocalRef<jobject>
+WebContentsDelegateAndroid::GetJavaDelegate(JNIEnv* env) const {
+  return weak_java_delegate_.get(env);
+}
+
+// ----------------------------------------------------------------------------
+// WebContentsDelegate methods
+// ----------------------------------------------------------------------------
+
+// OpenURLFromTab() will be called when we're performing a browser-intiated
+// navigation. The most common scenario for this is opening new tabs (see
+// RenderViewImpl::decidePolicyForNavigation for more details).
+WebContents* WebContentsDelegateAndroid::OpenURLFromTab(
+    WebContents* source,
+    const content::OpenURLParams& params) {
+  const GURL& url = params.url;
+  WindowOpenDisposition disposition = params.disposition;
+  content::PageTransition transition(
+      PageTransitionFromInt(params.transition));
+
+  if (!source || (disposition != CURRENT_TAB &&
+                  disposition != NEW_FOREGROUND_TAB &&
+                  disposition != NEW_BACKGROUND_TAB &&
+                  disposition != OFF_THE_RECORD)) {
+    NOTIMPLEMENTED();
+    return NULL;
+  }
+
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return WebContentsDelegate::OpenURLFromTab(source, params);
+
+  if (disposition == NEW_FOREGROUND_TAB ||
+      disposition == NEW_BACKGROUND_TAB ||
+      disposition == OFF_THE_RECORD) {
+    JNIEnv* env = AttachCurrentThread();
+    ScopedJavaLocalRef<jstring> java_url =
+        ConvertUTF8ToJavaString(env, url.spec());
+    Java_WebContentsDelegateAndroid_openNewTab(env,
+                                               obj.obj(),
+                                               java_url.obj(),
+                                               disposition == OFF_THE_RECORD);
+    return NULL;
+  }
+
+  // TODO(mkosiba): This should be in platform_utils OpenExternal, b/6174564.
+  if (transition == content::PAGE_TRANSITION_LINK && ShouldOverrideLoading(url))
+    return NULL;
+
+  source->GetController().LoadURL(url, params.referrer, transition,
+                                  std::string());
+  return source;
+}
+
+// ShouldIgnoreNavigation will be called for every non-local top level
+// navigation made by the renderer. If true is returned the renderer will
+// not perform the navigation. This is done by using synchronous IPC so we
+// should avoid blocking calls from this method.
+bool WebContentsDelegateAndroid::ShouldIgnoreNavigation(
+    WebContents* source,
+    const GURL& url,
+    const content::Referrer& referrer,
+    WindowOpenDisposition disposition,
+    content::PageTransition transition_type) {
+
+  // Don't override new tabs.
+  if (disposition == NEW_FOREGROUND_TAB ||
+      disposition == NEW_BACKGROUND_TAB ||
+      disposition == OFF_THE_RECORD)
+    return false;
+
+  return ShouldOverrideLoading(url);
+}
+
+void WebContentsDelegateAndroid::NavigationStateChanged(
+    const WebContents* source, unsigned changed_flags) {
+  if (changed_flags & (
+      content::INVALIDATE_TYPE_TAB | content::INVALIDATE_TYPE_TITLE)) {
+    JNIEnv* env = AttachCurrentThread();
+    ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+    if (obj.is_null())
+      return;
+    Java_WebContentsDelegateAndroid_onTabHeaderStateChanged(
+        env, obj.obj());
+  }
+}
+
+void WebContentsDelegateAndroid::AddNewContents(
+    WebContents* source,
+    WebContents* new_contents,
+    WindowOpenDisposition disposition,
+    const gfx::Rect& initial_pos,
+    bool user_gesture) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  bool handled = false;
+  if (!obj.is_null()) {
+    handled = Java_WebContentsDelegateAndroid_addNewContents(
+        env,
+        obj.obj(),
+        reinterpret_cast<jint>(source),
+        reinterpret_cast<jint>(new_contents),
+        static_cast<jint>(disposition),
+        NULL,
+        user_gesture);
+  }
+  if (!handled)
+    delete new_contents;
+}
+
+void WebContentsDelegateAndroid::ActivateContents(WebContents* contents) {
+  // TODO(dtrainor) When doing the merge I came across this.  Should we be
+  // activating this tab here?
+}
+
+void WebContentsDelegateAndroid::DeactivateContents(WebContents* contents) {
+  // Do nothing.
+}
+
+void WebContentsDelegateAndroid::LoadingStateChanged(WebContents* source) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return;
+  bool has_stopped = source == NULL || !source->IsLoading();
+
+  if (has_stopped)
+    Java_WebContentsDelegateAndroid_onLoadStopped(env, obj.obj());
+  else
+    Java_WebContentsDelegateAndroid_onLoadStarted(env, obj.obj());
+}
+
+void WebContentsDelegateAndroid::LoadProgressChanged(WebContents* source,
+                                                     double progress) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return;
+  Java_WebContentsDelegateAndroid_onLoadProgressChanged(
+      env,
+      obj.obj(),
+      progress);
+}
+
+void WebContentsDelegateAndroid::CloseContents(WebContents* source) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return;
+  Java_WebContentsDelegateAndroid_closeContents(env, obj.obj());
+}
+
+void WebContentsDelegateAndroid::MoveContents(WebContents* source,
+                                              const gfx::Rect& pos) {
+  // Do nothing.
+}
+
+bool WebContentsDelegateAndroid::AddMessageToConsole(
+    WebContents* source,
+    int32 level,
+    const string16& message,
+    int32 line_no,
+    const string16& source_id) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return WebContentsDelegate::AddMessageToConsole(source, level, message,
+                                                    line_no, source_id);
+  ScopedJavaLocalRef<jstring> jmessage(ConvertUTF16ToJavaString(env, message));
+  ScopedJavaLocalRef<jstring> jsource_id(
+      ConvertUTF16ToJavaString(env, source_id));
+  int jlevel = WEB_CONTENTS_DELEGATE_LOG_LEVEL_TIP;
+  switch (level) {
+    case logging::LOG_VERBOSE:
+      jlevel = WEB_CONTENTS_DELEGATE_LOG_LEVEL_TIP;
+      break;
+    case logging::LOG_INFO:
+      jlevel = WEB_CONTENTS_DELEGATE_LOG_LEVEL_LOG;
+      break;
+    case logging::LOG_WARNING:
+      jlevel = WEB_CONTENTS_DELEGATE_LOG_LEVEL_WARNING;
+      break;
+    case logging::LOG_ERROR:
+      jlevel = WEB_CONTENTS_DELEGATE_LOG_LEVEL_ERROR;
+      break;
+    default:
+      NOTREACHED();
+  }
+  return Java_WebContentsDelegateAndroid_addMessageToConsole(
+      env,
+      GetJavaDelegate(env).obj(),
+      jlevel,
+      jmessage.obj(),
+      line_no,
+      jsource_id.obj());
+}
+
+// TODO(merge): WARNING! method no longer available on the base class.
+// See http://b/issue?id=5862108
+void WebContentsDelegateAndroid::URLStarredChanged(WebContents* source,
+                                                   bool starred) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return;
+  Java_WebContentsDelegateAndroid_onUrlStarredChanged(env, obj.obj(), starred);
+}
+
+// This is either called from TabContents::DidNavigateMainFramePostCommit() with
+// an empty GURL or responding to RenderViewHost::OnMsgUpateTargetURL(). In
+// Chrome, the latter is not always called, especially not during history
+// navigation. So we only handle the first case and pass the source TabContents'
+// url to Java to update the UI.
+void WebContentsDelegateAndroid::UpdateTargetURL(WebContents* source,
+                                                 int32 page_id,
+                                                 const GURL& url) {
+  if (!url.is_empty())
+    return;
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return;
+  ScopedJavaLocalRef<jstring> java_url =
+      ConvertUTF8ToJavaString(env, source->GetURL().spec());
+  Java_WebContentsDelegateAndroid_onUpdateUrl(env,
+                                              obj.obj(),
+                                              java_url.obj());
+}
+
+bool WebContentsDelegateAndroid::CanDownload(
+    RenderViewHost* source,
+    int request_id,
+    const std::string& request_method) {
+  if (request_method == net::HttpRequestHeaders::kGetMethod) {
+    // TODO(leandrogracia): re-enable this when calling DownloadController
+    // doesn't introduce a DEPS layering violation.
+    // DownloadController::GetInstance()->CreateGETDownload(
+    //     source, request_id);
+    return false;
+  }
+  return true;
+}
+
+void WebContentsDelegateAndroid::OnStartDownload(WebContents* source,
+                                                 DownloadItem* download) {
+  // TODO(leandrogracia): re-enable this when calling DownloadController
+  // doesn't introduce a DEPS layering violation.
+  // DownloadController::GetInstance()->OnPostDownloadStarted(
+  //     source, download);
+}
+
+bool WebContentsDelegateAndroid::ShouldOverrideLoading(const GURL& url) {
+  if (!url.is_valid())
+    return false;
+
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return WebContentsDelegate::ShouldOverrideLoading(url);
+  ScopedJavaLocalRef<jstring> jstring_url =
+      ConvertUTF8ToJavaString(env, url.spec());
+  bool ret = Java_WebContentsDelegateAndroid_shouldOverrideUrlLoading(
+      env, obj.obj(), jstring_url.obj());
+  return ret;
+}
+
+void WebContentsDelegateAndroid::HandleKeyboardEvent(
+    content::WebContents* source,
+    const content::NativeWebKeyboardEvent& event) {
+  jobject key_event = event.os_event;
+  if (key_event) {
+    JNIEnv* env = AttachCurrentThread();
+    ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+    if (obj.is_null())
+      return;
+    Java_WebContentsDelegateAndroid_handleKeyboardEvent(
+        env, obj.obj(), key_event);
+  }
+}
+
+bool WebContentsDelegateAndroid::TakeFocus(WebContents* source, bool reverse) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return WebContentsDelegate::TakeFocus(source, reverse);
+  return Java_WebContentsDelegateAndroid_takeFocus(
+      env, obj.obj(), reverse);
+}
+
+JavaScriptDialogCreator*
+    WebContentsDelegateAndroid::GetJavaScriptDialogCreator() {
+  return javascript_dialog_creator_;
+}
+
+// ----------------------------------------------------------------------------
+// Native JNI methods
+// ----------------------------------------------------------------------------
+
+// Register native methods
+
+bool RegisterWebContentsDelegateAndroid(JNIEnv* env) {
+  if (!HasClass(env, kWebContentsDelegateAndroidClassPath)) {
+    DLOG(ERROR) << "Unable to find class WebContentsDelegateAndroid!";
+    return false;
+  }
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace web_contents_delegate_android
+}  // namespace component
+}  // namespace chrome