Full Keyboard Access: Second Approach

ui/views/cocoa/bridged_content_view.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.
 
 #import "ui/views/cocoa/bridged_content_view.h"
 
 #include "base/logging.h"
 #import "base/mac/mac_util.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "skia/ext/skia_utils_mac.h"
 #include "ui/base/cocoa/cocoa_base_utils.h"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/text_input_client.h"
 #include "ui/compositor/canvas_painter.h"
 #import "ui/events/cocoa/cocoa_event_utils.h"
 #include "ui/events/keycodes/dom/dom_code.h"
 #import "ui/events/keycodes/keyboard_code_conversion_mac.h"
 #include "ui/gfx/canvas_paint_mac.h"
 #include "ui/gfx/geometry/rect.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
 #include "ui/gfx/path.h"
 #import "ui/gfx/path_mac.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 #include "ui/strings/grit/ui_strings.h"
 #include "ui/views/controls/menu/menu_config.h"
 #include "ui/views/controls/menu/menu_controller.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
+#include "base/strings/utf_string_conversions.h"
 
 using views::MenuController;
 
 namespace {
 
+NSString* const kFullKeyboardAccessChangedNotification =
+    @"com.apple.KeyboardUIModeDidChange";
+
 // Returns true if all four corners of |rect| are contained inside |path|.
 bool IsRectInsidePath(NSRect rect, NSBezierPath* path) {
   return [path containsPoint:rect.origin] &&
          [path containsPoint:NSMakePoint(rect.origin.x + rect.size.width,
                                          rect.origin.y)] &&
          [path containsPoint:NSMakePoint(rect.origin.x,
                                          rect.origin.y + rect.size.height)] &&
          [path containsPoint:NSMakePoint(rect.origin.x + rect.size.width,
                                          rect.origin.y + rect.size.height)];
 }
@@ skipping 133 matching lines @@
 // catered for.
 // Note: default key bindings in Mac can be read from StandardKeyBinding.dict
 // which lives in /System/Library/Frameworks/AppKit.framework/Resources. Do
 // `plutil -convert xml1 -o StandardKeyBinding.xml StandardKeyBinding.dict` to
 // get something readable.
 - (void)handleAction:(int)commandId
              keyCode:(ui::KeyboardCode)keyCode
              domCode:(ui::DomCode)domCode
           eventFlags:(int)eventFlags;
 
+// Notification handler invoked when the Full Keyboard Access mode is changed.
+- (void)onFullKeyboardAccessModeChanged:(NSNotification*)notification;
+
 // Menu action handlers.
 - (void)undo:(id)sender;
 - (void)redo:(id)sender;
 - (void)cut:(id)sender;
 - (void)copy:(id)sender;
 - (void)paste:(id)sender;
 - (void)selectAll:(id)sender;
 
 @end
 
@@ skipping 16 matching lines @@
 
     // Apple's documentation says that NSTrackingActiveAlways is incompatible
     // with NSTrackingCursorUpdate, so use NSTrackingActiveInActiveApp.
     cursorTrackingArea_.reset([[CrTrackingArea alloc]
         initWithRect:NSZeroRect
              options:NSTrackingMouseMoved | NSTrackingCursorUpdate |
                      NSTrackingActiveInActiveApp | NSTrackingInVisibleRect
                owner:self
             userInfo:nil]);
     [self addTrackingArea:cursorTrackingArea_.get()];
+
+    // Get notified whenever Full Keyboard Access mode is changed.
+    [[NSDistributedNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(onFullKeyboardAccessModeChanged:)
+               name:kFullKeyboardAccessChangedNotification
+             object:nil];
+
+    // Initialize the focus manager with the correct keyboard accessibility
+    // setting.
+    [self updateFullKeyboardAccess];
   }
   return self;
 }
 
 - (void)clearView {
   textInputClient_ = nullptr;
   hostedView_ = nullptr;
   [cursorTrackingArea_.get() clearOwner];
   [self removeTrackingArea:cursorTrackingArea_.get()];
+  [[NSDistributedNotificationCenter defaultCenter] removeObserver:self];
 }
 
 - (void)processCapturedMouseEvent:(NSEvent*)theEvent {
   if (!hostedView_)
     return;
 
   NSWindow* source = [theEvent window];
   NSWindow* target = [self window];
   DCHECK(target);
 
@@ skipping 43 matching lines @@
 
   windowMask_.reset([gfx::CreateNSBezierPathFromSkPath(mask) retain]);
 
   // Convert to AppKit coordinate system.
   NSAffineTransform* flipTransform = [NSAffineTransform transform];
   [flipTransform translateXBy:0.0 yBy:frameRect.size.height];
   [flipTransform scaleXBy:1.0 yBy:-1.0];
   [windowMask_ transformUsingAffineTransform:flipTransform];
 }
 
+- (void)updateFullKeyboardAccess {
+  if (!hostedView_)
+    return;
+
+  DCHECK(hostedView_->GetWidget()->GetFocusManager());
+  hostedView_->GetWidget()->GetFocusManager()->SetKeyboardAccessible(
+      [NSApp isFullKeyboardAccessEnabled]);
+}
+
 // BridgedContentView private implementation.
 
 - (void)handleKeyEvent:(NSEvent*)theEvent {
   if (!hostedView_)
     return;
 
   DCHECK(theEvent);
   ui::KeyEvent event(theEvent);
   if (DispatchEventToMenu(hostedView_->GetWidget(), event.key_code()))
     return;
@@ skipping 15 matching lines @@
   // performed.
   if (commandId && textInputClient_ &&
       textInputClient_->IsEditCommandEnabled(commandId))
     textInputClient_->SetEditCommandForNextKeyEvent(commandId);
 
   // Generate a synthetic event with the keycode toolkit-views expects.
   ui::KeyEvent event(ui::ET_KEY_PRESSED, keyCode, domCode, eventFlags);
   hostedView_->GetWidget()->GetInputMethod()->DispatchKeyEvent(&event);
 }
 
+- (void)onFullKeyboardAccessModeChanged:(NSNotification*)notification {
+  DCHECK([[notification name]
+      isEqualToString:kFullKeyboardAccessChangedNotification]);
+  [self updateFullKeyboardAccess];
+}
+
 - (void)undo:(id)sender {
   // This DCHECK is more strict than a similar check in handleAction:. It can be
   // done here because the actors sending these actions should be calling
   // validateUserInterfaceItem: before enabling UI that allows these messages to
   // be sent. Checking it here would be too late to provide correct UI feedback
   // (e.g. there will be no "beep").
   DCHECK(textInputClient_->IsEditCommandEnabled(IDS_APP_UNDO));
   [self handleAction:IDS_APP_UNDO
              keyCode:ui::VKEY_Z
              domCode:ui::DomCode::US_Z
@@ skipping 586 matching lines @@
   }
 
   return [super accessibilityAttributeValue:attribute];
 }
 
 - (id)accessibilityHitTest:(NSPoint)point {
   return [hostedView_->GetNativeViewAccessible() accessibilityHitTest:point];
 }
 
 @end