refactor: use views::Widget on macOS

atom/browser/native_window_mac.h

@@ -23,7 +23,8 @@
 
 namespace atom {
 
-class NativeWindowMac : public NativeWindow {
+class NativeWindowMac : public NativeWindow,
+                        public views::WidgetDelegate {
  public:
   NativeWindowMac(const mate::Dictionary& options, NativeWindow* parent);
   ~NativeWindowMac() override;
@@ -144,19 +145,25 @@ class NativeWindowMac : public NativeWindow {
   bool fullscreen_window_title() const { return fullscreen_window_title_; }
   bool simple_fullscreen() const { return always_simple_fullscreen_; }
 
+ protected:
+  // views::WidgetDelegate:
+  void DeleteDelegate() override;
+  views::Widget* GetWidget() override;
+  const views::Widget* GetWidget() const override;
+
  private:
   void InternalSetParentWindow(NativeWindow* parent, bool attach);
   void ShowWindowButton(NSWindowButton button);
 
   void SetForwardMouseMessages(bool forward);
 
-  base::scoped_nsobject<AtomNSWindow> window_;
+  std::unique_ptr<views::Widget> widget_;
+  AtomNSWindow* window_;  // Weak ref, managed by widget_.
+
   base::scoped_nsobject<AtomNSWindowDelegate> window_delegate_;
   base::scoped_nsobject<AtomPreviewItem> preview_item_;
   base::scoped_nsobject<AtomTouchBar> touch_bar_;
 
-  std::unique_ptr<views::Widget> widget_;
-
   // Event monitor for scroll wheel event.
   id wheel_event_monitor_;
 

atom/browser/native_window_mac.mm

@@ -9,6 +9,7 @@
 #include <string>
 
 #include "atom/browser/native_browser_view_mac.h"
+#include "atom/browser/ui/cocoa/atom_native_widget_mac.h"
 #include "atom/browser/ui/cocoa/atom_ns_window.h"
 #include "atom/browser/ui/cocoa/atom_ns_window_delegate.h"
 #include "atom/browser/ui/cocoa/atom_preview_item.h"
@@ -247,9 +248,10 @@ NativeWindowMac::NativeWindowMac(const mate::Dictionary& options,
   options.Get(options::kHeight, &height);
 
   NSRect main_screen_rect = [[[NSScreen screens] firstObject] frame];
-  NSRect cocoa_bounds = NSMakeRect(
-      round((NSWidth(main_screen_rect) - width) / 2),
-      round((NSHeight(main_screen_rect) - height) / 2), width, height);
+  gfx::Rect bounds(round((NSWidth(main_screen_rect) - width) / 2),
+                   round((NSHeight(main_screen_rect) - height) / 2),
+                   width,
+                   height);
 
   bool resizable = true;
   options.Get(options::kResizable, &resizable);
@@ -303,10 +305,18 @@ NativeWindowMac::NativeWindowMac(const mate::Dictionary& options,
     styleMask |= NSResizableWindowMask;
   }
 
-  window_.reset([[AtomNSWindow alloc] initWithContentRect:cocoa_bounds
-                                                styleMask:styleMask
-                                                  backing:NSBackingStoreBuffered
-                                                    defer:YES]);
+  // Create views::Widget and assign window_ with it.
+  // TODO(zcbenz): Get rid of the window_ in future.
+  widget_.reset(new views::Widget());
+  views::Widget::InitParams params;
+  params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
+  params.bounds = bounds;
+  params.delegate = this;
+  params.type = views::Widget::InitParams::TYPE_WINDOW;
+  params.native_widget = new AtomNativeWidgetMac(styleMask, widget_.get());
+  widget_->Init(params);
+  window_ = static_cast<AtomNSWindow*>(widget_->GetNativeWindow());
+
   [window_ setShell:this];
   [window_ setEnableLargerThanScreen:enable_larger_than_screen()];
 
@@ -357,9 +367,6 @@ NativeWindowMac::NativeWindowMac(const mate::Dictionary& options,
     }
   }
 
-  // We will manage window's lifetime ourselves.
-  [window_ setReleasedWhenClosed:NO];
-
   // Hide the title bar background
   if (title_bar_style_ != NORMAL) {
     if (@available(macOS 10.10, *)) {
@@ -384,7 +391,7 @@ NativeWindowMac::NativeWindowMac(const mate::Dictionary& options,
   bool use_content_size = false;
   options.Get(options::kUseContentSize, &use_content_size);
   if (!has_frame() || !use_content_size)
-    SetSize(gfx::Size(width, height));
+    NativeWindow::SetSize(gfx::Size(width, height));
 
   options.Get(options::kZoomToPageWidth, &zoom_to_page_width_);
 
@@ -1145,7 +1152,7 @@ void NativeWindowMac::ToggleTabBar() {
 }
 
 bool NativeWindowMac::AddTabbedWindow(NativeWindow* window) {
-  if (window_.get() == window->GetNativeWindow()) {
+  if (window_ == window->GetNativeWindow()) {
     return false;
   } else {
     if (@available(macOS 10.12, *))
@@ -1289,6 +1296,17 @@ gfx::Rect NativeWindowMac::WindowBoundsToContentBounds(
   }
 }
 
+void NativeWindowMac::DeleteDelegate() {
+}
+
+views::Widget* NativeWindowMac::GetWidget() {
+  return widget_.get();
+}
+
+const views::Widget* NativeWindowMac::GetWidget() const {
+  return widget_.get();
+}
+
 void NativeWindowMac::InternalSetParentWindow(NativeWindow* parent,
                                               bool attach) {
   if (is_modal())

atom/browser/ui/cocoa/atom_native_widget_mac.h

@@ -11,7 +11,8 @@ namespace atom {
 
 class AtomNativeWidgetMac : public views::NativeWidgetMac {
  public:
-  explicit AtomNativeWidgetMac(views::internal::NativeWidgetDelegate* delegate);
+  AtomNativeWidgetMac(NSUInteger style_mask,
+                      views::internal::NativeWidgetDelegate* delegate);
   ~AtomNativeWidgetMac() override;
 
  protected:
@@ -20,6 +21,8 @@ class AtomNativeWidgetMac : public views::NativeWidgetMac {
       const views::Widget::InitParams& params) override;
 
  private:
+  NSUInteger style_mask_;
+
   DISALLOW_COPY_AND_ASSIGN(AtomNativeWidgetMac);
 };
 

atom/browser/ui/cocoa/atom_native_widget_mac.mm

@@ -4,17 +4,26 @@
 
 #include "atom/browser/ui/cocoa/atom_native_widget_mac.h"
 
+#include "atom/browser/ui/cocoa/atom_ns_window.h"
+#include "ui/base/cocoa/window_size_constants.h"
+
 namespace atom {
 
 AtomNativeWidgetMac::AtomNativeWidgetMac(
+    NSUInteger style_mask,
     views::internal::NativeWidgetDelegate* delegate)
-    : views::NativeWidgetMac(delegate) {}
+    : views::NativeWidgetMac(delegate),
+      style_mask_(style_mask) {}
 
 AtomNativeWidgetMac::~AtomNativeWidgetMac() {}
 
 NativeWidgetMacNSWindow* AtomNativeWidgetMac::CreateNSWindow(
     const views::Widget::InitParams& params) {
-  return views::NativeWidgetMac::CreateNSWindow(params);
+  return [[[AtomNSWindow alloc]
+      initWithContentRect:ui::kWindowSizeDeterminedLater
+                styleMask:style_mask_
+                  backing:NSBackingStoreBuffered
+                    defer:YES] autorelease];
 }
 
 }  // namespace atom

atom/browser/ui/cocoa/atom_ns_window.h

@@ -26,7 +26,7 @@ class ScopedDisableResize {
 
 }  // namespace atom
 
-@interface AtomNSWindow : EventDispatchingWindow {
+@interface AtomNSWindow : NativeWidgetMacNSWindow {
  @private
   atom::NativeWindowMac* shell_;
   CGFloat windowButtonsInterButtonSpacing_;

atom/browser/ui/cocoa/atom_ns_window_delegate.h

@@ -13,9 +13,9 @@ namespace atom {
 class NativeWindowMac;
 }
 
-@interface AtomNSWindowDelegate : NSObject<NSWindowDelegate,
-                                           NSTouchBarDelegate,
-                                           QLPreviewPanelDataSource> {
+@interface AtomNSWindowDelegate :
+    ViewsNSWindowDelegate<NSTouchBarDelegate,
+                          QLPreviewPanelDataSource> {
  @private
   atom::NativeWindowMac* shell_;
   bool is_zooming_;

atom/browser/ui/cocoa/atom_ns_window_delegate.mm

@@ -9,11 +9,21 @@
 #include "atom/browser/ui/cocoa/atom_preview_item.h"
 #include "atom/browser/ui/cocoa/atom_touch_bar.h"
 #include "base/mac/mac_util.h"
+#include "ui/views/widget/native_widget_mac.h"
 
 @implementation AtomNSWindowDelegate
 
 - (id)initWithShell:(atom::NativeWindowMac*)shell {
-  if ((self = [super init])) {
+  // The views library assumes the window delegate must be an instance of
+  // ViewsNSWindowDelegate, since we don't have a way to override the creation
+  // of NSWindowDelegate, we have to dynamically replace the window delegate
+  // on the fly.
+  // TODO(zcbenz): Add interface in NativeWidgetMac to allow overriding creating
+  // window delegate.
+  views::BridgedNativeWidget* bridget_view =
+      views::NativeWidgetMac::GetBridgeForNativeWindow(
+          shell->GetNativeWindow());
+  if ((self = [super initWithBridgedNativeWidget:bridget_view])) {
     shell_ = shell;
     is_zooming_ = false;
     level_ = [shell_->GetNativeWindow() level];

atom/browser/ui/cocoa/views_delegate_mac.mm

@@ -16,8 +16,7 @@ ViewsDelegateMac::~ViewsDelegateMac() {}
 void ViewsDelegateMac::OnBeforeWidgetInit(
     views::Widget::InitParams* params,
     views::internal::NativeWidgetDelegate* delegate) {
-  if (!params->native_widget)
-    params->native_widget = new views::NativeWidgetMac(delegate);
+  DCHECK(params->native_widget);
 }
 
 ui::ContextFactory* ViewsDelegateMac::GetContextFactory() {