[MacViews] Position modal sheets using ModalDialogHost.

chrome/browser/ui/views/apps/app_window_native_widget_mac.mm

 // Copyright 2015 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/views/apps/app_window_native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #import "chrome/browser/ui/cocoa/apps/titlebar_background_view.h"
 #import "chrome/browser/ui/views/frame/native_widget_mac_frameless_nswindow.h"
 #include "extensions/browser/app_window/native_app_window.h"
 #import "ui/base/cocoa/window_size_constants.h"
 
 AppWindowNativeWidgetMac::AppWindowNativeWidgetMac(
     views::Widget* widget,
     extensions::NativeAppWindow* native_app_window)
     : NativeWidgetMac(widget), native_app_window_(native_app_window) {
 }
 
 AppWindowNativeWidgetMac::~AppWindowNativeWidgetMac() {
 }
 
+int AppWindowNativeWidgetMac::SheetPositionY() {
+  NSWindow* ns_window = GetNativeWindow();
+  return NSHeight([ns_window frame]) - NSMaxY([[ns_window contentView] frame]);

[tapted, 2015/08/26 03:20:41]

how does this look for frameless widgets? (is it consistent with Cocoa?)

[jackhou1, 2015/08/26 07:02:08]

I had tried this with the USB selector dialog, but it turns out that's actually
WebContents modal. I'm not sure if there are any window-modal dialogs on app
windows. There's only one override of -willPositionSheet in the codebase, and
it's on BrowserWindowControllerPrivate, so presumably any modal sheets on app
windows will do the default, which is to show it at the top of the contentView
frame.

+}
+
 NSWindow* AppWindowNativeWidgetMac::CreateNSWindow(
     const views::Widget::InitParams& params) {
   // If the window has a native or colored frame, use the same NSWindow as
   // NativeWidgetMac.
   if (!native_app_window_->IsFrameless()) {
     NSWindow* ns_window = NativeWidgetMac::CreateNSWindow(params);
     if (native_app_window_->HasFrameColor()) {
       [TitlebarBackgroundView
           addToNSWindow:ns_window
             activeColor:native_app_window_->ActiveFrameColor()
           inactiveColor:native_app_window_->InactiveFrameColor()];
     }
     return ns_window;
   }
 
   // NSTexturedBackgroundWindowMask is needed to implement draggable window
   // regions.
   NSUInteger style_mask = NSTexturedBackgroundWindowMask | NSTitledWindowMask |
                           NSClosableWindowMask | NSMiniaturizableWindowMask |
                           NSResizableWindowMask;
   return [[[NativeWidgetMacFramelessNSWindow alloc]
       initWithContentRect:ui::kWindowSizeDeterminedLater
                 styleMask:style_mask
                   backing:NSBackingStoreBuffered
                     defer:NO] autorelease];
 }