MacViews: Implement NativeViewHostMac (take 3)

ui/views/controls/native/native_view_host_mac.mm

+// Copyright 2014 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 "ui/views/controls/native/native_view_host_mac.h"
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/logging.h"
+#include "base/mac/foundation_util.h"
+#import "ui/views/cocoa/bridged_content_view.h"
+#include "ui/views/controls/native/native_view_host.h"
+#include "ui/views/widget/widget.h"
+
+namespace views {
+namespace {
+
+// Reparents |native_view| to be a child of the native content view of
+// |new_parent|.
+void ReparentNSView(NSView* native_view, Widget* new_parent) {
+  DCHECK(native_view);
+  // Mac's NativeViewHost has no support for hosting its own child widgets.
+  // This check is probably overly restrictive, since the Widget containing the
+  // NativeViewHost _is_ allowed child Widgets. However, we don't know yet
+  // whether those child Widgets need to be distinguished from Widgets that code
+  // might want to associate with the hosted NSView instead.
+  {
+    Widget::Widgets child_widgets;
+    Widget::GetAllChildWidgets(native_view, &child_widgets);
+    CHECK_GE(1u, child_widgets.size());  // 1 (itself) or 0 if detached.
+  }
+
+  if (!new_parent) {
+    [native_view removeFromSuperview];
+    return;
+  }
+
+  BridgedContentView* new_superview =
+      base::mac::ObjCCastStrict<BridgedContentView>(
+          new_parent->GetNativeView());
+  DCHECK(new_superview);
+  [new_superview addSubview:native_view];
+}
+
+}  // namespace
+
+NativeViewHostMac::NativeViewHostMac(NativeViewHost* host) : host_(host) {
+}
+
+NativeViewHostMac::~NativeViewHostMac() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeViewHostMac, NativeViewHostWrapper implementation:
+
+void NativeViewHostMac::AttachNativeView() {
+  DCHECK(host_->native_view());
+  ReparentNSView(host_->native_view(), host_->GetWidget());
+}
+
+void NativeViewHostMac::NativeViewDetaching(bool destroyed) {
+  // |destroyed| is only true if this class calls host_->NativeViewDestroyed().
+  // TODO(tapted): See if that's needed on Mac, since views are hard to destroy
+  // by themselves.
+  DCHECK(!destroyed);
+  [host_->native_view() setHidden:YES];
+  ReparentNSView(host_->native_view(), NULL);
+}
+
+void NativeViewHostMac::AddedToWidget() {
+  if (!host_->native_view())
+    return;
+
+  AttachNativeView();
+  host_->Layout();
+}
+
+void NativeViewHostMac::RemovedFromWidget() {
+  if (!host_->native_view())
+    return;
+
+  NativeViewDetaching(false);
+}
+
+void NativeViewHostMac::InstallClip(int x, int y, int w, int h) {
+  NOTIMPLEMENTED();
+}
+
+bool NativeViewHostMac::HasInstalledClip() {
+  return false;
+}
+
+void NativeViewHostMac::UninstallClip() {
+  NOTIMPLEMENTED();
+}
+
+void NativeViewHostMac::ShowWidget(int x, int y, int w, int h) {
+  if (host_->fast_resize())
+    NOTIMPLEMENTED();
+
+  // Coordinates will be from the top left of the parent Widget. The NativeView
+  // is already in the same NSWindow, so just flip to get Cooca coordinates and
+  // then convert to the containing view.
+  NSRect window_rect = NSMakeRect(
+      x,
+      host_->GetWidget()->GetClientAreaBoundsInScreen().height() - y - h,
+      w,
+      h);
+
+  // Convert window coordinates to the hosted view's superview, since that's how
+  // coordinates of the hosted view's frame is based.
+  NSRect container_rect =
+      [[host_->native_view() superview] convertRect:window_rect fromView:nil];
+  [host_->native_view() setFrame:container_rect];
+  [host_->native_view() setHidden:NO];
+}
+
+void NativeViewHostMac::HideWidget() {
+  [host_->native_view() setHidden:YES];
+}
+
+void NativeViewHostMac::SetFocus() {
+  if ([host_->native_view() acceptsFirstResponder])
+    [[host_->native_view() window] makeFirstResponder:host_->native_view()];
+}
+
+gfx::NativeViewAccessible NativeViewHostMac::GetNativeViewAccessible() {
+  return NULL;
+}
+
+gfx::NativeCursor NativeViewHostMac::GetCursor(int x, int y) {
+  NOTIMPLEMENTED();
+  return gfx::kNullCursor;
+}
+
+// static
+NativeViewHostWrapper* NativeViewHostWrapper::CreateWrapper(
+    NativeViewHost* host) {
+  return new NativeViewHostMac(host);
+}
+
+}  // namespace views