MacViews: TouchBar integration for toolkit-views dialogs.

ui/views/cocoa/bridged_content_view_touch_bar.mm

+// Copyright 2016 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.
+
+#import "base/mac/scoped_nsobject.h"
+#import "base/mac/sdk_forward_declarations.h"
+#include "base/strings/sys_string_conversions.h"
+#import "ui/base/cocoa/touch_bar_forward_declarations.h"
+#include "ui/base/models/dialog_model.h"
+#import "ui/views/cocoa/bridged_content_view.h"
+#include "ui/views/widget/widget_delegate.h"
+#include "ui/views/window/dialog_client_view.h"
+#include "ui/views/window/dialog_delegate.h"
+
+namespace {
+
+NSString* const kTouchBarDialogButtonsGroupId =
+    @"com.google.chrome-DIALOG-BUTTONS-GROUP";
+NSString* const kTouchBarOKId = @"com.google.chrome-OK";
+NSString* const kTouchBarCancelId = @"com.google.chrome-CANCEL";
+
+}  // namespace
+
+@interface BridgedContentView (TouchBarAdditions)<NSTouchBarDelegate>
+- (void)touchBarButtonAction:(id)sender;
+@end
+
+@implementation BridgedContentView (TouchBarAdditions)
+
+- (void)touchBarButtonAction:(id)sender {
+  if (!hostedView_)
+    return;
+
+  views::DialogDelegate* dialog =
+      hostedView_->GetWidget()->widget_delegate()->AsDialogDelegate();
+  DCHECK(dialog);
+  views::DialogClientView* client = dialog->GetDialogClientView();
+
+  if ([sender tag] == ui::DIALOG_BUTTON_OK) {
+    client->AcceptWindow();
+    return;
+  }
+
+  DCHECK_EQ([sender tag], ui::DIALOG_BUTTON_CANCEL);
+  client->CancelWindow();
+}
+
+// NSTouchBarDelegate protocol implementation.
+
+- (NSTouchBarItem*)touchBar:(NSTouchBar*)touchBar
+      makeItemForIdentifier:(NSTouchBarItemIdentifier)identifier {
+  if (!hostedView_)
+    return nil;
+
+  if ([identifier isEqualToString:kTouchBarDialogButtonsGroupId]) {
+    NSMutableArray* items = [NSMutableArray arrayWithCapacity:2];
+    for (NSTouchBarItemIdentifier i : @[ kTouchBarCancelId, kTouchBarOKId ]) {

[Avi (use Gerrit), 2016/11/04 16:41:24]

:? I thought the objective c for-in was for( x in y)?

[tapted, 2016/11/06 23:57:48]

Changed to `in`.  `:` wasn't intentional, but I investigated a ~year ago and the
syntax actually results in identical assembly code (i.e. both using ObjC
semantics/NSFastEnumeration). So I guess it's a good hint that this iterates
over ObjC stuff rather than C++ iterators. (Of course, the other perspective is
that the ObjC `in` could now be totally redundant and we could scrap it :).

[Avi (use Gerrit), 2016/11/07 00:59:54]

That is genuinely weird. Maybe they bridge it where begin()/end() on a
fast-enumerable collection uses fast enumeration? I'm sure Nico will step in and
provide a link to the Clang front-end where that happens.

+      NSTouchBarItem* item = [self touchBar:touchBar makeItemForIdentifier:i];
+      if (item)
+        [items addObject:item];
+    }
+    if ([items count] == 0)
+      return nil;
+    return [NSGroupTouchBarItem groupItemWithIdentifier:identifier items:items];
+  }
+
+  ui::DialogButton type = ui::DIALOG_BUTTON_NONE;
+  if ([identifier isEqualToString:kTouchBarOKId])
+    type = ui::DIALOG_BUTTON_OK;
+  else if ([identifier isEqualToString:kTouchBarCancelId])
+    type = ui::DIALOG_BUTTON_CANCEL;
+  else
+    return nil;
+
+  ui::DialogModel* model =
+      hostedView_->GetWidget()->widget_delegate()->AsDialogDelegate();
+  if (!model || !(model->GetDialogButtons() & type))
+    return nil;
+
+  base::scoped_nsobject<NSCustomTouchBarItem> item([[NSClassFromString(
+      @"NSCustomTouchBarItem") alloc] initWithIdentifier:identifier]);
+  NSString* title = base::SysUTF16ToNSString(model->GetDialogButtonLabel(type));
+  NSButton* button =
+      [NSButton buttonWithTitle:title
+                         target:self
+                         action:@selector(touchBarButtonAction:)];
+  if (type == model->GetDefaultDialogButton()) {
+    // NSAlert uses a private NSButton subclass (_NSTouchBarGroupButton) with
+    // more bells and whistles. It doesn't use -setBezelColor: directly, but
+    // this gives an appearance matching the default _NSTouchBarGroupButton.

[Avi (use Gerrit), 2016/11/04 16:41:24]

👍

+    [button setBezelColor:[NSColor colorWithSRGBRed:0.168
+                                              green:0.51
+                                               blue:0.843
+                                              alpha:1.0]];
+  }
+  [button setEnabled:model->IsDialogButtonEnabled(type)];
+  [button setTag:type];
+  [item setView:button];
+  return item.autorelease();
+}
+
+// NSTouchBarProvider protocol implementation (via NSResponder category).
+
+- (NSTouchBar*)makeTouchBar {
+  if (!hostedView_)
+    return nil;
+
+  ui::DialogModel* model =
+      hostedView_->GetWidget()->widget_delegate()->AsDialogDelegate();
+  if (!model || !model->GetDialogButtons())
+    return nil;
+
+  base::scoped_nsobject<NSTouchBar> bar(
+      [[NSClassFromString(@"NSTouchBar") alloc] init]);
+  [bar setDelegate:self];
+
+  // Use a group rather than individual items so they can be centered together.
+  [bar setDefaultItemIdentifiers:@[ kTouchBarDialogButtonsGroupId ]];
+
+  // Setting the group as principal will center it in the TouchBar.
+  [bar setPrincipalItemIdentifier:kTouchBarDialogButtonsGroupId];
+  return bar.autorelease();
+}
+
+@end