Merge pull request #12858 from electron/api-view

Refactor NativeWindow (Part 13): Add View and WebContentsView APIs

atom/browser/api/atom_api_browser_window.cc

@@ -77,7 +77,6 @@ BrowserWindow::BrowserWindow(v8::Isolate* isolate,
 
   // Associate with BrowserWindow.
   web_contents->SetOwnerWindow(window());
-  window()->SetContentView(web_contents->managed_web_contents());
 
   auto* host = web_contents->web_contents()->GetRenderViewHost();
   if (host)

atom/browser/api/atom_api_top_level_window.cc

@@ -9,6 +9,7 @@
 
 #include "atom/browser/api/atom_api_browser_view.h"
 #include "atom/browser/api/atom_api_menu.h"
+#include "atom/browser/api/atom_api_view.h"
 #include "atom/browser/api/atom_api_web_contents.h"
 #include "atom/common/color_util.h"
 #include "atom/common/native_mate_converters/callback.h"
@@ -267,6 +268,11 @@ void TopLevelWindow::OnWindowMessage(UINT message,
 }
 #endif
 
+void TopLevelWindow::SetContentView(mate::Handle<View> view) {
+  content_view_.Reset(isolate(), view.ToV8());
+  window_->SetContentView(view->view());
+}
+
 void TopLevelWindow::Close() {
   window_->Close();
 }
@@ -767,6 +773,13 @@ void TopLevelWindow::CloseFilePreview() {
   window_->CloseFilePreview();
 }
 
+v8::Local<v8::Value> TopLevelWindow::GetContentView() const {
+  if (content_view_.IsEmpty())
+    return v8::Null(isolate());
+  else
+    return v8::Local<v8::Value>::New(isolate(), content_view_);
+}
+
 v8::Local<v8::Value> TopLevelWindow::GetParentWindow() const {
   if (parent_window_.IsEmpty())
     return v8::Null(isolate());
@@ -915,6 +928,7 @@ void TopLevelWindow::BuildPrototype(v8::Isolate* isolate,
   prototype->SetClassName(mate::StringToV8(isolate, "TopLevelWindow"));
   mate::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
       .MakeDestroyable()
+      .SetMethod("setContentView", &TopLevelWindow::SetContentView)
       .SetMethod("close", &TopLevelWindow::Close)
       .SetMethod("focus", &TopLevelWindow::Focus)
       .SetMethod("blur", &TopLevelWindow::Blur)
@@ -1024,6 +1038,7 @@ void TopLevelWindow::BuildPrototype(v8::Isolate* isolate,
       .SetMethod("setAspectRatio", &TopLevelWindow::SetAspectRatio)
       .SetMethod("previewFile", &TopLevelWindow::PreviewFile)
       .SetMethod("closeFilePreview", &TopLevelWindow::CloseFilePreview)
+      .SetMethod("getContentView", &TopLevelWindow::GetContentView)
       .SetMethod("getParentWindow", &TopLevelWindow::GetParentWindow)
       .SetMethod("getChildWindows", &TopLevelWindow::GetChildWindows)
       .SetMethod("getBrowserView", &TopLevelWindow::GetBrowserView)

atom/browser/api/atom_api_top_level_window.h

@@ -20,6 +20,8 @@ namespace atom {
 
 namespace api {
 
+class View;
+
 class TopLevelWindow : public mate::TrackableObject<TopLevelWindow>,
                        public NativeWindowObserver {
  public:
@@ -79,6 +81,7 @@ class TopLevelWindow : public mate::TrackableObject<TopLevelWindow>,
 #endif
 
   // Public APIs of NativeWindow.
+  void SetContentView(mate::Handle<View> view);
   void Close();
   virtual void Focus();
   virtual void Blur();
@@ -179,6 +182,7 @@ class TopLevelWindow : public mate::TrackableObject<TopLevelWindow>,
   void CloseFilePreview();
 
   // Public getters of NativeWindow.
+  v8::Local<v8::Value> GetContentView() const;
   v8::Local<v8::Value> GetParentWindow() const;
   std::vector<v8::Local<v8::Object>> GetChildWindows() const;
   v8::Local<v8::Value> GetBrowserView() const;
@@ -215,6 +219,7 @@ class TopLevelWindow : public mate::TrackableObject<TopLevelWindow>,
   MessageCallbackMap messages_callback_map_;
 #endif
 
+  v8::Global<v8::Value> content_view_;
   v8::Global<v8::Value> browser_view_;
   v8::Global<v8::Value> menu_;
   v8::Global<v8::Value> parent_window_;
@@ -231,7 +236,7 @@ class TopLevelWindow : public mate::TrackableObject<TopLevelWindow>,
 
 namespace mate {
 
-template<>
+template <>
 struct Converter<atom::NativeWindow*> {
   static bool FromV8(v8::Isolate* isolate,
                      v8::Local<v8::Value> val,

atom/browser/api/atom_api_url_request.cc

@@ -3,7 +3,9 @@
 // found in the LICENSE file.
 
 #include "atom/browser/api/atom_api_url_request.h"
+
 #include <string>
+
 #include "atom/browser/api/atom_api_session.h"
 #include "atom/browser/net/atom_url_request.h"
 #include "atom/common/api/event_emitter_caller.h"

atom/browser/api/atom_api_url_request.h

@@ -7,6 +7,7 @@
 
 #include <array>
 #include <string>
+
 #include "atom/browser/api/event_emitter.h"
 #include "atom/browser/api/trackable_object.h"
 #include "base/memory/weak_ptr.h"

atom/browser/api/atom_api_view.cc

@@ -0,0 +1,61 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/api/atom_api_view.h"
+
+#include "native_mate/dictionary.h"
+
+#include "atom/common/node_includes.h"
+
+namespace atom {
+
+namespace api {
+
+View::View(views::View* view) : view_(view) {}
+
+View::View() : view_(new views::View()) {
+  view_->set_owned_by_client();
+}
+
+View::~View() {
+  if (delete_view_)
+    delete view_;
+}
+
+// static
+mate::WrappableBase* View::New(mate::Arguments* args) {
+  auto* view = new View();
+  view->InitWith(args->isolate(), args->GetThis());
+  return view;
+}
+
+// static
+void View::BuildPrototype(v8::Isolate* isolate,
+                          v8::Local<v8::FunctionTemplate> prototype) {}
+
+}  // namespace api
+
+}  // namespace atom
+
+namespace {
+
+using atom::api::View;
+
+void Initialize(v8::Local<v8::Object> exports,
+                v8::Local<v8::Value> unused,
+                v8::Local<v8::Context> context,
+                void* priv) {
+  v8::Isolate* isolate = context->GetIsolate();
+  View::SetConstructor(isolate, base::Bind(&View::New));
+
+  mate::Dictionary constructor(isolate,
+                               View::GetConstructor(isolate)->GetFunction());
+
+  mate::Dictionary dict(isolate, exports);
+  dict.Set("View", constructor);
+}
+
+}  // namespace
+
+NODE_BUILTIN_MODULE_CONTEXT_AWARE(atom_browser_view, Initialize)

atom/browser/api/atom_api_view.h

@@ -0,0 +1,62 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_API_ATOM_API_VIEW_H_
+#define ATOM_BROWSER_API_ATOM_API_VIEW_H_
+
+#include <memory>
+
+#include "atom/browser/api/event_emitter.h"
+#include "ui/views/view.h"
+
+namespace atom {
+
+namespace api {
+
+class View : public mate::EventEmitter<View> {
+ public:
+  static mate::WrappableBase* New(mate::Arguments* args);
+
+  static void BuildPrototype(v8::Isolate* isolate,
+                             v8::Local<v8::FunctionTemplate> prototype);
+
+  views::View* view() const { return view_; }
+
+ protected:
+  explicit View(views::View* view);
+  View();
+  ~View() override;
+
+  // Should delete the |view_| in destructor.
+  void set_delete_view(bool should) { delete_view_ = should; }
+
+ private:
+  bool delete_view_ = true;
+  views::View* view_ = nullptr;
+
+  DISALLOW_COPY_AND_ASSIGN(View);
+};
+
+}  // namespace api
+
+}  // namespace atom
+
+namespace mate {
+
+template <>
+struct Converter<views::View*> {
+  static bool FromV8(v8::Isolate* isolate,
+                     v8::Local<v8::Value> val,
+                     views::View** out) {
+    atom::api::View* view;
+    if (!Converter<atom::api::View*>::FromV8(isolate, val, &view))
+      return false;
+    *out = view->view();
+    return true;
+  }
+};
+
+}  // namespace mate
+
+#endif  // ATOM_BROWSER_API_ATOM_API_VIEW_H_

atom/browser/api/atom_api_web_contents_view.cc

@@ -0,0 +1,88 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/api/atom_api_web_contents_view.h"
+
+#include "atom/browser/api/atom_api_web_contents.h"
+#include "brightray/browser/inspectable_web_contents_view.h"
+#include "native_mate/dictionary.h"
+
+#if defined(OS_MACOSX)
+#include "atom/browser/ui/cocoa/delayed_native_view_host.h"
+#endif
+
+#include "atom/common/node_includes.h"
+
+namespace atom {
+
+namespace api {
+
+WebContentsView::WebContentsView(
+    v8::Isolate* isolate,
+    v8::Local<v8::Value> web_contents_wrapper,
+    brightray::InspectableWebContents* web_contents)
+#if defined(OS_MACOSX)
+    : View(new DelayedNativeViewHost(web_contents->GetView()->GetNativeView())),
+#else
+    : View(web_contents->GetView()->GetView()),
+#endif
+      web_contents_wrapper_(isolate, web_contents_wrapper) {
+#if defined(OS_MACOSX)
+  // On macOS a View is created to wrap the NSView, and its lifetime is managed
+  // by us.
+  view()->set_owned_by_client();
+#else
+  // On other platforms the View is managed by InspectableWebContents.
+  set_delete_view(false);
+#endif
+}
+
+WebContentsView::~WebContentsView() {}
+
+// static
+mate::WrappableBase* WebContentsView::New(
+    mate::Arguments* args,
+    mate::Handle<WebContents> web_contents) {
+  if (!web_contents->managed_web_contents()) {
+    const char* error = "The WebContents must be created by user";
+    args->isolate()->ThrowException(
+        v8::Exception::Error(mate::StringToV8(args->isolate(), error)));
+    return nullptr;
+  }
+  auto* view = new WebContentsView(args->isolate(), web_contents->GetWrapper(),
+                                   web_contents->managed_web_contents());
+  view->InitWith(args->isolate(), args->GetThis());
+  return view;
+}
+
+// static
+void WebContentsView::BuildPrototype(
+    v8::Isolate* isolate,
+    v8::Local<v8::FunctionTemplate> prototype) {}
+
+}  // namespace api
+
+}  // namespace atom
+
+namespace {
+
+using atom::api::WebContentsView;
+
+void Initialize(v8::Local<v8::Object> exports,
+                v8::Local<v8::Value> unused,
+                v8::Local<v8::Context> context,
+                void* priv) {
+  v8::Isolate* isolate = context->GetIsolate();
+  WebContentsView::SetConstructor(isolate, base::Bind(&WebContentsView::New));
+
+  mate::Dictionary constructor(
+      isolate, WebContentsView::GetConstructor(isolate)->GetFunction());
+
+  mate::Dictionary dict(isolate, exports);
+  dict.Set("WebContentsView", constructor);
+}
+
+}  // namespace
+
+NODE_BUILTIN_MODULE_CONTEXT_AWARE(atom_browser_web_contents_view, Initialize)

atom/browser/api/atom_api_web_contents_view.h

@@ -0,0 +1,46 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_API_ATOM_API_WEB_CONTENTS_VIEW_H_
+#define ATOM_BROWSER_API_ATOM_API_WEB_CONTENTS_VIEW_H_
+
+#include "atom/browser/api/atom_api_view.h"
+#include "native_mate/handle.h"
+
+namespace brightray {
+class InspectableWebContents;
+}
+
+namespace atom {
+
+namespace api {
+
+class WebContents;
+
+class WebContentsView : public View {
+ public:
+  static mate::WrappableBase* New(mate::Arguments* args,
+                                  mate::Handle<WebContents> web_contents);
+
+  static void BuildPrototype(v8::Isolate* isolate,
+                             v8::Local<v8::FunctionTemplate> prototype);
+
+ protected:
+  WebContentsView(v8::Isolate* isolate,
+                  v8::Local<v8::Value> web_contents_wrapper,
+                  brightray::InspectableWebContents* web_contents);
+  ~WebContentsView() override;
+
+ private:
+  // Keep a reference to v8 wrapper.
+  v8::Global<v8::Value> web_contents_wrapper_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebContentsView);
+};
+
+}  // namespace api
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_API_ATOM_API_WEB_CONTENTS_VIEW_H_

atom/browser/native_window.cc

@@ -48,6 +48,7 @@ gfx::Size GetExpandedWindowSize(const NativeWindow* window, gfx::Size size) {
 NativeWindow::NativeWindow(const mate::Dictionary& options,
                            NativeWindow* parent)
     : widget_(new views::Widget),
+      content_view_(nullptr),
       has_frame_(true),
       transparent_(false),
       enable_larger_than_screen_(false),

atom/browser/native_window.h

@@ -20,10 +20,6 @@
 
 class SkRegion;
 
-namespace brightray {
-class InspectableWebContents;
-}
-
 namespace content {
 struct NativeWebKeyboardEvent;
 }
@@ -60,8 +56,7 @@ class NativeWindow : public base::SupportsUserData,
 
   void InitFromOptions(const mate::Dictionary& options);
 
-  virtual void SetContentView(
+  virtual void SetContentView(views::View* view) = 0;
-      brightray::InspectableWebContents* web_contents) = 0;
 
   virtual void Close() = 0;
   virtual void CloseImmediately() = 0;
@@ -264,6 +259,7 @@ class NativeWindow : public base::SupportsUserData,
   }
 
   views::Widget* widget() const { return widget_.get(); }
+  views::View* content_view() const { return content_view_; }
 
   bool has_frame() const { return has_frame_; }
   void set_has_frame(bool has_frame) { has_frame_ = has_frame; }
@@ -282,6 +278,7 @@ class NativeWindow : public base::SupportsUserData,
   views::Widget* GetWidget() override;
   const views::Widget* GetWidget() const override;
 
+  void set_content_view(views::View* view) { content_view_ = view; }
   void set_browser_view(NativeBrowserView* browser_view) {
     browser_view_ = browser_view;
   }
@@ -289,6 +286,9 @@ class NativeWindow : public base::SupportsUserData,
  private:
   std::unique_ptr<views::Widget> widget_;
 
+  // The content view, weak ref.
+  views::View* content_view_;
+
   // Whether window has standard frame.
   bool has_frame_;
 

atom/browser/native_window_mac.h

@@ -21,10 +21,6 @@
 @class CustomWindowButtonView;
 @class FullSizeContentView;
 
-namespace views {
-class NativeViewHost;
-}
-
 namespace atom {
 
 class RootViewMac;
@@ -35,7 +31,7 @@ class NativeWindowMac : public NativeWindow {
   ~NativeWindowMac() override;
 
   // NativeWindow:
-  void SetContentView(brightray::InspectableWebContents* web_contents) override;
+  void SetContentView(views::View* view) override;
   void Close() override;
   void CloseImmediately() override;
   void Focus(bool focus) override;
@@ -144,7 +140,6 @@ class NativeWindowMac : public NativeWindow {
   };
   TitleBarStyle title_bar_style() const { return title_bar_style_; }
 
-  views::View* content_view() { return content_view_; }
   AtomPreviewItem* preview_item() const { return preview_item_.get(); }
   AtomTouchBar* touch_bar() const { return touch_bar_.get(); }
   bool zoom_to_page_width() const { return zoom_to_page_width_; }
@@ -178,9 +173,6 @@ class NativeWindowMac : public NativeWindow {
   // The view that fills the client area.
   std::unique_ptr<RootViewMac> root_view_;
 
-  // The content view, managed by widget_.
-  views::NativeViewHost* content_view_;
-
   bool is_kiosk_;
   bool was_fullscreen_;
   bool zoom_to_page_width_;

atom/browser/native_window_mac.mm

@@ -257,7 +257,6 @@ NativeWindowMac::NativeWindowMac(const mate::Dictionary& options,
                                  NativeWindow* parent)
     : NativeWindow(options, parent),
       root_view_(new RootViewMac(this)),
-      content_view_(nullptr),
       is_kiosk_(false),
       was_fullscreen_(false),
       zoom_to_page_width_(false),
@@ -452,6 +451,9 @@ NativeWindowMac::NativeWindowMac(const mate::Dictionary& options,
   // by calls to other APIs.
   SetMaximizable(maximizable);
 
+  // Default content view.
+  SetContentView(new views::View());
+
   // Make sure the bottom corner is rounded for non-modal windows:
   // http://crbug.com/396264. But do not enable it on OS X 10.9 for transparent
   // window, otherwise a semi-transparent frame would show.
@@ -512,15 +514,13 @@ NativeWindowMac::~NativeWindowMac() {
   [NSEvent removeMonitor:wheel_event_monitor_];
 }
 
-void NativeWindowMac::SetContentView(
+void NativeWindowMac::SetContentView(views::View* view) {
-    brightray::InspectableWebContents* web_contents) {
   views::View* root_view = GetContentsView();
-  if (content_view_)
+  if (content_view())
-    root_view->RemoveChildView(content_view_);
+    root_view->RemoveChildView(content_view());
 
-  content_view_ = new views::NativeViewHost();
+  set_content_view(view);
-  root_view->AddChildView(content_view_);
+  root_view->AddChildView(content_view());
-  content_view_->Attach(web_contents->GetView()->GetNativeView());
 
   if (buttons_view_) {
     // Ensure the buttons view are always floated on the top.

atom/browser/native_window_views.cc

@@ -102,7 +102,6 @@ NativeWindowViews::NativeWindowViews(const mate::Dictionary& options,
                                      NativeWindow* parent)
     : NativeWindow(options, parent),
       root_view_(new RootView(this)),
-      content_view_(nullptr),
       focused_view_(nullptr),
 #if defined(OS_WIN)
       checked_for_a11y_support_(false),
@@ -277,6 +276,9 @@ NativeWindowViews::NativeWindowViews(const mate::Dictionary& options,
 #endif
   }
 
+  // Default content view.
+  SetContentView(new views::View());
+
   gfx::Size size = bounds.size();
   if (has_frame() &&
       options.Get(options::kUseContentSize, &use_content_size_) &&
@@ -304,19 +306,18 @@ NativeWindowViews::~NativeWindowViews() {
 #endif
 }
 
-void NativeWindowViews::SetContentView(
+void NativeWindowViews::SetContentView(views::View* view) {
-    brightray::InspectableWebContents* web_contents) {
+  if (content_view()) {
-  if (content_view_) {
+    root_view_->RemoveChildView(content_view());
-    root_view_->RemoveChildView(content_view_);
     if (browser_view()) {
-      content_view_->RemoveChildView(
+      content_view()->RemoveChildView(
           browser_view()->GetInspectableWebContentsView()->GetView());
       set_browser_view(nullptr);
     }
   }
-  content_view_ = web_contents->GetView()->GetView();
+  set_content_view(view);
-  focused_view_ = web_contents->GetView()->GetWebView();
+  focused_view_ = view;
-  root_view_->AddChildView(content_view_);
+  root_view_->AddChildView(content_view());
   root_view_->Layout();
 }
 
@@ -560,7 +561,7 @@ gfx::Rect NativeWindowViews::GetBounds() {
 }
 
 gfx::Rect NativeWindowViews::GetContentBounds() {
-  return content_view_ ? content_view_->GetBoundsInScreen() : gfx::Rect();
+  return content_view() ? content_view()->GetBoundsInScreen() : gfx::Rect();
 }
 
 gfx::Size NativeWindowViews::GetContentSize() {
@@ -569,7 +570,7 @@ gfx::Size NativeWindowViews::GetContentSize() {
     return NativeWindow::GetContentSize();
 #endif
 
-  return content_view_ ? content_view_->size() : gfx::Size();
+  return content_view() ? content_view()->size() : gfx::Size();
 }
 
 void NativeWindowViews::SetContentSizeConstraints(
@@ -924,11 +925,11 @@ void NativeWindowViews::SetMenu(AtomMenuModel* menu_model) {
 }
 
 void NativeWindowViews::SetBrowserView(NativeBrowserView* view) {
-  if (!content_view_)
+  if (!content_view())
     return;
 
   if (browser_view()) {
-    content_view_->RemoveChildView(
+    content_view()->RemoveChildView(
         browser_view()->GetInspectableWebContentsView()->GetView());
     set_browser_view(nullptr);
   }
@@ -940,7 +941,8 @@ void NativeWindowViews::SetBrowserView(NativeBrowserView* view) {
   // Add as child of the main web view to avoid (0, 0) origin from overlapping
   // with menu bar.
   set_browser_view(view);
-  content_view_->AddChildView(view->GetInspectableWebContentsView()->GetView());
+  content_view()->AddChildView(
+      view->GetInspectableWebContentsView()->GetView());
 }
 
 void NativeWindowViews::SetParentWindow(NativeWindow* parent) {

atom/browser/native_window_views.h

@@ -44,7 +44,7 @@ class NativeWindowViews : public NativeWindow,
   ~NativeWindowViews() override;
 
   // NativeWindow:
-  void SetContentView(brightray::InspectableWebContents* web_contents) override;
+  void SetContentView(views::View* view) override;
   void Close() override;
   void CloseImmediately() override;
   void Focus(bool focus) override;
@@ -135,7 +135,6 @@ class NativeWindowViews : public NativeWindow,
   void SetIcon(const gfx::ImageSkia& icon);
 #endif
 
-  views::View* content_view() const { return content_view_; }
   SkRegion* draggable_region() const { return draggable_region_.get(); }
 
 #if defined(OS_WIN)
@@ -197,7 +196,6 @@ class NativeWindowViews : public NativeWindow,
 
   std::unique_ptr<RootView> root_view_;
 
-  views::View* content_view_;  // Weak ref.
   views::View* focused_view_;  // The view should be focused by default.
 
   // The "resizable" flag on Linux is implemented by setting size constraints,

atom/browser/ui/cocoa/delayed_native_view_host.cc

@@ -0,0 +1,21 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/ui/cocoa/delayed_native_view_host.h"
+
+namespace atom {
+
+DelayedNativeViewHost::DelayedNativeViewHost(gfx::NativeView native_view)
+    : native_view_(native_view) {}
+
+DelayedNativeViewHost::~DelayedNativeViewHost() {}
+
+void DelayedNativeViewHost::ViewHierarchyChanged(
+    const ViewHierarchyChangedDetails& details) {
+  NativeViewHost::ViewHierarchyChanged(details);
+  if (details.is_add)
+    Attach(native_view_);
+}
+
+}  // namespace atom

atom/browser/ui/cocoa/delayed_native_view_host.h

@@ -0,0 +1,31 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_UI_COCOA_DELAYED_NATIVE_VIEW_HOST_H_
+#define ATOM_BROWSER_UI_COCOA_DELAYED_NATIVE_VIEW_HOST_H_
+
+#include "ui/views/controls/native/native_view_host.h"
+
+namespace atom {
+
+// Automatically attach the native view after the NativeViewHost is attached to
+// a widget. (Attaching it directly would cause crash.)
+class DelayedNativeViewHost : public views::NativeViewHost {
+ public:
+  explicit DelayedNativeViewHost(gfx::NativeView native_view);
+  ~DelayedNativeViewHost() override;
+
+  // views::View:
+  void ViewHierarchyChanged(
+      const ViewHierarchyChangedDetails& details) override;
+
+ private:
+  gfx::NativeView native_view_;
+
+  DISALLOW_COPY_AND_ASSIGN(DelayedNativeViewHost);
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_UI_COCOA_DELAYED_NATIVE_VIEW_HOST_H_

atom/browser/ui/cocoa/root_view_mac.mm

@@ -4,7 +4,7 @@
 
 #include "atom/browser/ui/cocoa/root_view_mac.h"
 
-#include "atom/browser/native_window_mac.h"
+#include "atom/browser/native_window.h"
 
 namespace atom {
 
@@ -15,12 +15,10 @@ RootViewMac::RootViewMac(NativeWindow* window) : window_(window) {
 RootViewMac::~RootViewMac() {}
 
 void RootViewMac::Layout() {
-  views::View* content_view =
+  if (!window_->content_view())  // Not ready yet.
-      static_cast<NativeWindowMac*>(window_)->content_view();
-  if (!content_view)  // Not ready yet.
     return;
 
-  content_view->SetBoundsRect(gfx::Rect(gfx::Point(), size()));
+  window_->content_view()->SetBoundsRect(gfx::Rect(gfx::Point(), size()));
 }
 
 gfx::Size RootViewMac::GetMinimumSize() const {

atom/browser/ui/views/root_view.cc

@@ -4,7 +4,7 @@
 
 #include "atom/browser/ui/views/root_view.h"
 
-#include "atom/browser/native_window_views.h"
+#include "atom/browser/native_window.h"
 #include "atom/browser/ui/views/menu_bar.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 
@@ -86,7 +86,7 @@ bool RootView::IsMenuBarAutoHide() const {
 }
 
 void RootView::SetMenuBarVisibility(bool visible) {
-  if (!menu_bar_ || menu_bar_visible_ == visible)
+  if (!window_->content_view() || !menu_bar_ || menu_bar_visible_ == visible)
     return;
 
   // Always show the accelerator when the auto-hide menu bar shows.
@@ -151,9 +151,7 @@ void RootView::ResetAltState() {
 }
 
 void RootView::Layout() {
-  views::View* content_view =
+  if (!window_->content_view())  // Not ready yet.
-      static_cast<NativeWindowViews*>(window_)->content_view();
-  if (!content_view)  // Not ready yet.
     return;
 
   const auto menu_bar_bounds =
@@ -162,7 +160,7 @@ void RootView::Layout() {
   if (menu_bar_)
     menu_bar_->SetBoundsRect(menu_bar_bounds);
 
-  content_view->SetBoundsRect(
+  window_->content_view()->SetBoundsRect(
       gfx::Rect(0, menu_bar_bounds.height(), size().width(),
                 size().height() - menu_bar_bounds.height()));
 }

atom/common/node_bindings.cc

@@ -49,6 +49,8 @@
   V(atom_browser_top_level_window)           \
   V(atom_browser_tray)                       \
   V(atom_browser_web_contents)               \
+  V(atom_browser_web_contents_view)          \
+  V(atom_browser_view)                       \
   V(atom_browser_web_view_manager)           \
   V(atom_browser_window)                     \
   V(atom_common_asar)                        \

filenames.gypi

@@ -38,7 +38,9 @@
       'lib/browser/api/top-level-window.js',
       'lib/browser/api/touch-bar.js',
       'lib/browser/api/tray.js',
+      'lib/browser/api/view.js',
       'lib/browser/api/web-contents.js',
+      'lib/browser/api/web-contents-view.js',
       'lib/browser/chrome-extension.js',
       'lib/browser/desktop-capturer.js',
       'lib/browser/guest-view-manager.js',
@@ -162,9 +164,13 @@
       'atom/browser/api/atom_api_tray.h',
       'atom/browser/api/atom_api_url_request.cc',
       'atom/browser/api/atom_api_url_request.h',
+      'atom/browser/api/atom_api_view.cc',
+      'atom/browser/api/atom_api_view.h',
       'atom/browser/api/atom_api_web_contents.cc',
       'atom/browser/api/atom_api_web_contents.h',
       'atom/browser/api/atom_api_web_contents_mac.mm',
+      'atom/browser/api/atom_api_web_contents_view.cc',
+      'atom/browser/api/atom_api_web_contents_view.h',
       'atom/browser/api/atom_api_web_request.cc',
       'atom/browser/api/atom_api_web_request.h',
       'atom/browser/api/atom_api_web_view_manager.cc',
@@ -329,6 +335,8 @@
       'atom/browser/ui/cocoa/atom_preview_item.mm',
       'atom/browser/ui/cocoa/atom_touch_bar.h',
       'atom/browser/ui/cocoa/atom_touch_bar.mm',
+      'atom/browser/ui/cocoa/delayed_native_view_host.cc',
+      'atom/browser/ui/cocoa/delayed_native_view_host.h',
       'atom/browser/ui/cocoa/views_delegate_mac.h',
       'atom/browser/ui/cocoa/views_delegate_mac.mm',
       'atom/browser/ui/cocoa/root_view_mac.mm',

lib/browser/api/browser-window.js

@@ -1,7 +1,7 @@
 'use strict'
 
 const electron = require('electron')
-const {ipcMain, TopLevelWindow} = electron
+const {ipcMain, WebContentsView, TopLevelWindow} = electron
 const {BrowserWindow} = process.atomBinding('window')
 const v8Util = process.atomBinding('v8_util')
 
@@ -14,6 +14,9 @@ BrowserWindow.prototype._init = function () {
   // Avoid recursive require.
   const {app} = electron
 
+  // Create WebContentsView.
+  this.setContentView(new WebContentsView(this.webContents))
+
   // Make new windows requested by links behave like "window.open"
   this.webContents.on('-new-window', (event, url, frameName, disposition,
                                       additionalFeatures, postData,

lib/browser/api/module-list.js

@@ -22,7 +22,9 @@ module.exports = [
   {name: 'TopLevelWindow', file: 'top-level-window'},
   {name: 'TouchBar', file: 'touch-bar'},
   {name: 'Tray', file: 'tray'},
+  {name: 'View', file: 'view'},
   {name: 'webContents', file: 'web-contents'},
+  {name: 'WebContentsView', file: 'web-contents-view'},
   // The internal modules, invisible unless you know their names.
   {name: 'NavigationController', file: 'navigation-controller', private: true}
 ]

lib/browser/api/view.js

@@ -0,0 +1,11 @@
+'use strict'
+
+const {EventEmitter} = require('events')
+const {View} = process.atomBinding('view')
+
+Object.setPrototypeOf(View.prototype, EventEmitter.prototype)
+
+View.prototype._init = function () {
+}
+
+module.exports = View

lib/browser/api/web-contents-view.js

@@ -0,0 +1,15 @@
+'use strict'
+
+const electron = require('electron')
+
+const {View} = electron
+const {WebContentsView} = process.atomBinding('web_contents_view')
+
+Object.setPrototypeOf(WebContentsView.prototype, View.prototype)
+
+WebContentsView.prototype._init = function () {
+  // Call parent class's _init.
+  View.prototype._init.call(this)
+}
+
+module.exports = WebContentsView