Add history popup when long pressing on the back key.

chrome/browser/ui/android/navigation_popup.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/ui/android/navigation_popup.h"
+
+#include "base/android/jni_string.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/bind.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/favicon/favicon_service.h"
+#include "chrome/browser/favicon/favicon_service_factory.h"
+#include "chrome/browser/history/history_types.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/common/url_constants.h"
+#include "googleurl/src/gurl.h"
+#include "grit/ui_resources.h"
+#include "jni/NavigationPopup_jni.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/android/java_bitmap.h"
+#include "ui/gfx/favicon_size.h"
+#include "ui/gfx/image/image.h"
+
+using base::android::ConvertUTF8ToJavaString;
+using base::android::ScopedJavaLocalRef;
+
+NavigationPopup::NavigationPopup(JNIEnv* env, jobject obj)
+    : weak_jobject_(env, obj) {
+}
+
+NavigationPopup::~NavigationPopup() {
+}
+
+void NavigationPopup::Destroy(JNIEnv* env, jobject obj) {
+  delete this;
+}
+
+void NavigationPopup::FetchFaviconForUrl(JNIEnv* env,
+                                         jobject obj,
+                                         jstring jurl) {
+  Profile* profile = g_browser_process->profile_manager()->GetLastUsedProfile();
+  FaviconService* favicon_service = FaviconServiceFactory::GetForProfile(
+      profile, Profile::EXPLICIT_ACCESS);
+  if (!favicon_service)
+    return;
+  GURL url(base::android::ConvertJavaStringToUTF16(env, jurl));
+  favicon_service->GetFaviconImageForURL(
+      FaviconService::FaviconForURLParams(profile,
+                                          url,
+                                          history::FAVICON,
+                                          gfx::kFaviconSize),
+      base::Bind(&NavigationPopup::OnFaviconDataAvailable,
+                 base::Unretained(this),
+                 url),
+      &cancelable_task_tracker_);
+}
+
+void NavigationPopup::OnFaviconDataAvailable(
+    GURL navigation_entry_url,
+    const history::FaviconImageResult& image_result) {
+  gfx::Image image(image_result.image);
+  if (image.IsEmpty()) {
+    ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+    image = rb.GetImageNamed(IDR_DEFAULT_FAVICON);
+  }
+
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj(weak_jobject_.get(env));
+  if (!obj.obj())
+    return;
+
+  ScopedJavaLocalRef<jstring> jurl(
+      ConvertUTF8ToJavaString(env, navigation_entry_url.spec()));
+
+  Java_NavigationPopup_onFaviconUpdated(
+      env,
+      obj.obj(),
+      jurl.obj(),
+      gfx::ConvertToJavaBitmap(image.ToSkBitmap()).obj());

[Nico, 2013/01/03 22:48:51]

This will only give you the lowest-resolution variant of a favicon. Is that what
you want? On Cros and Mac, we try to show higher-res variants on higher-res
displays (generally, by keeping them all in memory and picking the right one at
draw time. With tablets / phones, I suppose the scale factor doesn't change
often and you can just pick the right one here?)

[Ted C, 2013/01/04 01:11:45]

Hmm...I think this needs to be done when I request the favicon in
FetchFaviconForUrl.  I currently hardcode 16 as my desired dp, but really I
should passed a scaled value.  I added a TODO that will will handle passing down
scale (or calculating here if android provides the density correctly somewhere).

+}
+
+static jstring GetHistoryUrl(JNIEnv* env, jclass clazz) {
+  return ConvertUTF8ToJavaString(env, chrome::kChromeUIHistoryURL).Release();
+}
+
+static jint Init(JNIEnv* env, jobject obj) {
+  NavigationPopup* popup = new NavigationPopup(env, obj);
+  return reinterpret_cast<jint>(popup);
+}
+
+// static
+bool NavigationPopup::RegisterNavigationPopup(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}