Hide/show widget on Windows screen lock/unlock

ui/views/view.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <stddef.h>
 
 #include <algorithm>
@@ skipping 1064 matching lines @@
   virtual void VisibilityChanged(View* starting_from, bool is_visible);
 
   // This method is invoked when the parent NativeView of the widget that the
   // view is attached to has changed and the view hierarchy has not changed.
   // ViewHierarchyChanged() is called when the parent NativeView of the widget
   // that the view is attached to is changed as a result of changing the view
   // hierarchy. Overriding this method is useful for tracking which
   // FocusManager manages this view.
   virtual void NativeViewHierarchyChanged();
 
+  virtual void OnSoftVisibilityChanged(bool visible) {}
+
   // Painting ------------------------------------------------------------------
 
   // Responsible for calling Paint() on child Views. Override to control the
   // order child Views are painted.
   virtual void PaintChildren(const ui::PaintContext& context);
 
   // Override to provide rendering in any part of the View's bounds. Typically
   // this is the "contents" of the view. If you override this method you will
   // have to call the subsequent OnPaint*() methods manually.
   virtual void OnPaint(gfx::Canvas* canvas);
@@ skipping 187 matching lines @@
 
   // Size and disposition ------------------------------------------------------
 
   // Call VisibilityChanged() recursively for all children.
   void PropagateVisibilityNotifications(View* from, bool is_visible);
 
   // Registers/unregisters accelerators as necessary and calls
   // VisibilityChanged().
   void VisibilityChangedImpl(View* starting_from, bool is_visible);
 
+  void PropagateSoftVisibilityChanged(bool visible);
+
   // Responsible for propagating bounds change notifications to relevant
   // views.
   void BoundsChanged(const gfx::Rect& previous_bounds);
 
   // Visible bounds notification registration.
   // When a view is added to a hierarchy, it and all its children are asked if
   // they need to be registered for "visible bounds within root" notifications
   // (see comment on OnVisibleBoundsChanged()). If they do, they are registered
   // with every ancestor between them and the root of the hierarchy.
   static void RegisterChildrenForVisibleBoundsNotification(View* view);
@@ skipping 273 matching lines @@
   // Belongs to this view, but it's reference-counted on some platforms
   // so we can't use a scoped_ptr. It's dereferenced in the destructor.
   NativeViewAccessibility* native_view_accessibility_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_