Show transient child when the transient parent is shown

ui/wm/core/transient_window_manager.h

 // 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.
 
 #ifndef UI_WM_CORE_TRANSIENT_WINDOW_MANAGER_H_
 #define UI_WM_CORE_TRANSIENT_WINDOW_MANAGER_H_
 
 #include <vector>
 
 #include "base/observer_list.h"
 #include "ui/aura/window_observer.h"
 #include "ui/wm/wm_export.h"
 
 namespace wm {
 
 class TransientWindowObserver;
 
 // TransientWindowManager manages the set of transient children for a window
 // along with the transient parent. Transient children get the following
 // behavior:
 // . The transient parent destroys any transient children when it is
 //   destroyed. This means a transient child is destroyed if either its parent
 //   or transient parent is destroyed.
 // . If a transient child and its transient parent share the same parent, then
 //   transient children are always ordered above the transient parent.
+// . If a transient parent is hidden, it hides all transient children.
+//   For show operation, please refer to |set_parent_controls_visibility(bool)|.
 // Transient windows are typically used for popups and menus.
 // TODO(sky): when we nuke TransientWindowClient rename this to
 // TransientWindowController.
 class WM_EXPORT TransientWindowManager : public aura::WindowObserver {
  public:
   typedef std::vector<aura::Window*> Windows;
 
   virtual ~TransientWindowManager();
 
   // Returns the TransientWindowManager for |window|. This never returns NULL.
   static TransientWindowManager* Get(aura::Window* window);
 
   // Returns the TransientWindowManager for |window| only if it already exists.
   // WARNING: this may return NULL.
   static const TransientWindowManager* Get(const aura::Window* window);
 
   void AddObserver(TransientWindowObserver* observer);
   void RemoveObserver(TransientWindowObserver* observer);
 
   // Adds or removes a transient child.
   void AddTransientChild(aura::Window* child);
   void RemoveTransientChild(aura::Window* child);
 
+  // Setting true lets the transient parent show this transient
+  // child when the parent is shown. If this was shown when the
+  // transient parent is hidden, it remains hidden and gets shown
+  // when the transient parent is shown. This is false by default.
+  void set_parent_controls_visibility(bool parent_controls_visibility) {
+    parent_controls_visibility_ = parent_controls_visibility;
+  }
+
   const Windows& transient_children() const { return transient_children_; }
 
   aura::Window* transient_parent() { return transient_parent_; }
   const aura::Window* transient_parent() const { return transient_parent_; }
 
   // Returns true if in the process of stacking |window_| on top of |target|.
   // That is, when the stacking order of a window changes
   // (OnWindowStackingChanged()) the transients may get restacked as well. This
   // function can be used to detect if TransientWindowManager is in the process
   // of stacking a transient as the result of window stacking changing.
   bool IsStackingTransient(const aura::Window* target) const;
 
  private:
   explicit TransientWindowManager(aura::Window* window);
 
   // Stacks transient descendants of this window that are its siblings just
   // above it.
   void RestackTransientDescendants();
 
+  // Update the window's visibility following the transient parent's
+  // visibility. See |set_parent_controls_visibility(bool)| for more details.
+  void UpdateTransientChildVisibility(bool visible);
+
   // WindowObserver:
   virtual void OnWindowParentChanged(aura::Window* window,
                                      aura::Window* parent) OVERRIDE;
   virtual void OnWindowVisibilityChanging(aura::Window* window,
                                           bool visible) OVERRIDE;
+  virtual void OnWindowVisibilityChanged(aura::Window* window,
+                                         bool visible) OVERRIDE;
   virtual void OnWindowStackingChanged(aura::Window* window) OVERRIDE;
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
   aura::Window* window_;
   aura::Window* transient_parent_;
   Windows transient_children_;
 
   // If non-null we're actively restacking transient as the result of a
   // transient ancestor changing.
   aura::Window* stacking_target_;
 
+  bool parent_controls_visibility_;
+  bool show_on_parent_visible_;
+  bool ignore_visibility_changed_event_;
+
   ObserverList<TransientWindowObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(TransientWindowManager);
 };
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_TRANSIENT_WINDOW_MANAGER_H_