Implement Non-Closable Notification

ui/views/controls/slide_out_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_CONTROLS_SLIDE_OUT_VIEW_H_
 #define UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_
 
 #include "base/macros.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/views/view.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 
 // A View that can be closed by a slide-out touch gesture.
 class VIEWS_EXPORT SlideOutView : public views::View,
                                   public ui::ImplicitAnimationObserver {
  public:
   SlideOutView();
   ~SlideOutView() override;
 
+  bool slide_out_enabled() { return is_slide_out_enabled_; }
+
  protected:
   // Called when user intends to close the View by sliding it out.
   virtual void OnSlideOut() = 0;
 
   // Overridden from views::View.
   void OnGestureEvent(ui::GestureEvent* event) override;
 
+  void set_slide_out_enabled(bool is_slide_out_enabled) {
+    is_slide_out_enabled_ = is_slide_out_enabled;
+  }
+
  private:
   enum SlideDirection {
     SLIDE_LEFT,
     SLIDE_RIGHT,
   };
 
   // Restores the transform and opacity of the view.
   void RestoreVisualState();
 
   // Slides the view out and closes it after the animation.
   void SlideOutAndClose(SlideDirection direction);
 
   // Overridden from ImplicitAnimationObserver.
   void OnImplicitAnimationsCompleted() override;
 
-  float gesture_scroll_amount_;
+  float gesture_amount_ = 0.f;
+  bool is_slide_out_enabled_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(SlideOutView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_