Browser side implementation of browser plugin

content/browser/browser_plugin/browser_plugin_web_contents_observer.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 "content/browser/browser_plugin/browser_plugin_web_contents_observer.h"
+
+#include "content/public/browser/notification_details.h"
+#include "content/public/browser/notification_source.h"
+#include "content/public/browser/notification_types.h"
+#include "content/public/browser/render_widget_host.h"
+#include "content/public/browser/web_contents.h"
+
+// static
+BrowserPluginWebContentsObserver*
+BrowserPluginWebContentsObserver::Create(
+    content::WebContents* web_contents) {
+  return new BrowserPluginWebContentsObserver(web_contents);
+}
+
+BrowserPluginWebContentsObserver::BrowserPluginWebContentsObserver(
+    content::WebContents* web_contents)
+    : WebContentsObserver(web_contents) {
+  registrar_.Add(this,
+                 content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
+                 content::Source<content::RenderViewHost>(
+                    web_contents->GetRenderViewHost()));
+}
+
+BrowserPluginWebContentsObserver::~BrowserPluginWebContentsObserver() {
+}
+
+void BrowserPluginWebContentsObserver::AddGuest(
+    content::WebContents* guest,
+    int64 frame_id) {
+  guests_[guest] = frame_id;
+}
+
+void BrowserPluginWebContentsObserver::RemoveGuest(
+    content::WebContents* guest) {
+  guests_.erase(guest);
+}
+
+void BrowserPluginWebContentsObserver::DestroyGuests() {
+  for (GuestMap::const_iterator it = guests_.begin();
+       it != guests_.end(); ++it) {
+    const content::WebContents* contents = it->first;
+    delete contents;
+  }
+  guests_.clear();
+}
+
+void BrowserPluginWebContentsObserver::DidCommitProvisionalLoadForFrame(
+    int64 frame_id,
+    bool is_main_frame,
+    const GURL& url,
+    content::PageTransition transition_type) {
+  GuestSet guests_to_delete;
+  for (GuestMap::const_iterator it = guests_.begin();
+       it != guests_.end(); ++it) {
+    content::WebContents* contents = it->first;
+    if (it->second == frame_id) {
+      guests_to_delete.insert(contents);
+    }
+  }
+  for (GuestSet::const_iterator it = guests_to_delete.begin();
+       it != guests_to_delete.end(); ++it) {
+    delete *it;
+    guests_.erase(*it);
+  }
+}
+
+void BrowserPluginWebContentsObserver::RenderViewDeleted(
+    content::RenderViewHost* render_view_host) {
+  DestroyGuests();
+}
+
+void BrowserPluginWebContentsObserver::RenderViewGone(
+    base::TerminationStatus status) {
+  DestroyGuests();
+}
+
+void BrowserPluginWebContentsObserver::WebContentsDestroyed(
+    content::WebContents* web_contents) {
+  DestroyGuests();
+}
+
+void BrowserPluginWebContentsObserver::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  DCHECK(type == content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED);
+  bool visible = *content::Details<bool>(details).ptr();
+
+  // If the host is hidden we need to hide the guests as well.
+  for (GuestMap::const_iterator it = guests_.begin();
+       it != guests_.end(); ++it) {
+    content::WebContents* contents = it->first;
+    if (visible)
+      contents->ShowContents();
+    else
+      contents->HideContents();
+  }
+}
+