Created min size for print preview dialog and modified to allow the

components/constrained_window/native_web_contents_modal_dialog_manager_views.h

 // 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.
 
 #ifndef COMPONENTS_CONSTRAINED_WINDOW_NATIVE_WEB_CONTENTS_MODAL_DIALOG_MANAGER_VIEWS_H_
 #define COMPONENTS_CONSTRAINED_WINDOW_NATIVE_WEB_CONTENTS_MODAL_DIALOG_MANAGER_VIEWS_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "components/web_modal/modal_dialog_host.h"
 #include "components/web_modal/single_web_contents_dialog_manager.h"
+#if defined(USE_AURA)
+#include "ui/aura/window_observer.h"
+#include "ui/aura/window_tree_host_observer.h"
+#endif
+#include "ui/base/accelerators/accelerator.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace views {
 class Widget;
 }
 
 namespace constrained_window {
 
 // Class for parenting a tab-modal views dialog off of a views browser.
+#if defined(USE_AURA)
 class NativeWebContentsModalDialogManagerViews
     : public web_modal::SingleWebContentsDialogManager,
       public web_modal::ModalDialogHostObserver,
+      public views::WidgetObserver,
+      public aura::WindowObserver,
+      public aura::WindowTreeHostObserver {
+ public:
+  NativeWebContentsModalDialogManagerViews(
+      gfx::NativeWindow dialog,
+      web_modal::SingleWebContentsDialogManagerDelegate* native_delegate,
+      bool is_toplevel, ui::AcceleratorTarget* target);
+
+  ~NativeWebContentsModalDialogManagerViews() override;
+
+  // Sets up this object to manage the |dialog_|. Registers for closing events
+  // in order to notify the delegate. If |is_toplevel| is true, the dialog will
+  // be set up as a top level dialog (peer of the host's native window), with
+  // the host as its transient parent. However, unlike most window modal
+  // dialogs, it will not block all events to its transient parent.
+  void ManageDialog(bool is_toplevel);
+
+  // web_modal::SingleWebContentsDialogManager:
+  void Show() override;
+  void Hide() override;
+  void Close() override;
+  void Focus() override;
+  void Pulse() override;
+
+  // web_modal::ModalDialogHostObserver:
+  void OnPositionRequiresUpdate() override;
+  void OnHostDestroying() override;
+
+  // views::WidgetObserver:
+
+  // NOTE(wittman): OnWidgetClosing is overriden to ensure that, when the widget
+  // is explicitly closed, the destruction occurs within the same call
+  // stack. This avoids event races that lead to non-deterministic destruction
+  // ordering in e.g. the print preview dialog. OnWidgetDestroying is overridden
+  // because OnWidgetClosing is *only* invoked on explicit close, not when the
+  // widget is implicitly destroyed due to its parent being closed. This
+  // situation occurs with app windows.  WidgetClosing removes the observer, so
+  // only one of these two functions is ever invoked for a given widget.
+  void OnWidgetClosing(views::Widget* widget) override;
+  void OnWidgetDestroying(views::Widget* widget) override;
+  void OnWidgetActivationChanged(views::Widget* widget, bool active) override;
+  void HostChanged(web_modal::WebContentsModalDialogHost* new_host) override;
+  gfx::NativeWindow dialog() override;
+
+#if defined(USE_AURA)
+  // aura::WindowObserver
+  void OnWindowBoundsChanged(aura::Window* window,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override;
+  void OnWindowDestroying(aura::Window* window) override;
+  void OnWindowStackingChanged(aura::Window* window) override;
+  void OnWindowParentChanged(aura::Window* window,
+                             aura::Window* parent) override;
+
+  // aura::WindowTreeHostObserver
+  void OnHostMovedInPixels(const aura::WindowTreeHost* host,
+                           const gfx::Point& new_origin_in_pixels) override;
+
+  // Helper function to stack |widget|'s native window above the modal dialog
+  // host's native window.
+  void StackWidgetAtTop(views::Widget* widget);
+
+#endif
+
+ protected:
+  web_modal::SingleWebContentsDialogManagerDelegate* native_delegate() {
+    return native_delegate_;
+  }
+
+  // By default just calls widget->Show() or Hide(), but allows a derived class
+  // to override in order to hide an alternate way (e.g. if the default hide
+  // would tear down attached dialogs too early).
+  virtual void ShowWidget(views::Widget* widget);
+  virtual void HideWidget(views::Widget* widget);
+  void FocusInternal(views::Widget* widget);
+  static views::Widget* GetWidget(gfx::NativeWindow dialog);
+
+ private:
+  void WidgetClosing(views::Widget* widget);
+  void OnNonClippedPositionRequiresUpdate();
+
+  web_modal::SingleWebContentsDialogManagerDelegate* native_delegate_;
+  gfx::NativeWindow dialog_;
+  web_modal::WebContentsModalDialogHost* host_;
+  bool host_destroying_;
+
+  // A target that accelerators that arrive at the host web contents widget will
+  // be forwarded to. Used to enable escape = dialog close for top level
+  // dialogs.
+  ui::AcceleratorTarget* target_;
+
+  std::set<views::Widget*> observed_widgets_;
+  std::set<views::Widget*> shown_widgets_;
+
+//  base::OneShotTimer timer_;
+
+  // Tracks if Show() was called from within the manager or elsewhere.
+  bool called_internal_ = false;
+
+  // Tracks if the top level window is currently minimized.
+  bool window_minimized_ = false;
+
+  // Used to indicate if the call to Show() has been deferred to prevent focus
+  // problems - if true, Show() should be callled when the window is next
+  // re-stacked.
+  bool show_on_next_stack_ = false;
+
+  // Whether or not the parent widget (host window) is inactive while the
+  // preview dialog is active.
+  bool parent_inactive_ = false;
+
+  // Used to indicate that the state is being updated for a new host.
+  bool host_changing_ = false;
+
+  bool need_to_show_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeWebContentsModalDialogManagerViews);
+};
+#else
+class NativeWebContentsModalDialogManagerViews
+    : public web_modal::SingleWebContentsDialogManager,
+      public web_modal::ModalDialogHostObserver,
       public views::WidgetObserver {
  public:
   NativeWebContentsModalDialogManagerViews(
       gfx::NativeWindow dialog,
-      web_modal::SingleWebContentsDialogManagerDelegate* native_delegate);
+      web_modal::SingleWebContentsDialogManagerDelegate* native_delegate,
+      bool is_toplevel, ui::AcceleratorTarget* target);
 
   ~NativeWebContentsModalDialogManagerViews() override;
 
   // Sets up this object to manage the |dialog_|. Registers for closing events
-  // in order to notify the delegate.
-  void ManageDialog();
+  // in order to notify the delegate. If |is_toplevel| is true, the dialog will
+  // be set up as a top level dialog (peer of the host's native window), with
+  // the host as its transient parent. However, unlike most window modal
+  // dialogs, it will not block all events to its transient parent.
+  void ManageDialog(bool is_toplevel);
 
   // web_modal::SingleWebContentsDialogManager:
   void Show() override;
   void Hide() override;
   void Close() override;
   void Focus() override;
   void Pulse() override;
 
   // web_modal::ModalDialogHostObserver:
   void OnPositionRequiresUpdate() override;
@@ skipping 22 matching lines @@
   // By default just calls widget->Show() or Hide(), but allows a derived class
   // to override in order to hide an alternate way (e.g. if the default hide
   // would tear down attached dialogs too early).
   virtual void ShowWidget(views::Widget* widget);
   virtual void HideWidget(views::Widget* widget);
 
   static views::Widget* GetWidget(gfx::NativeWindow dialog);
 
  private:
   void WidgetClosing(views::Widget* widget);
-
+  void OnNonClippedPositionRequiresUpdate();
+  void FocusInternal(views::Widget* widget);
   web_modal::SingleWebContentsDialogManagerDelegate* native_delegate_;
   gfx::NativeWindow dialog_;
   web_modal::WebContentsModalDialogHost* host_;
   bool host_destroying_;
+  ui::AcceleratorTarget* target_;
   std::set<views::Widget*> observed_widgets_;
   std::set<views::Widget*> shown_widgets_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWebContentsModalDialogManagerViews);
 };
 
+#endif // USE_AURA
 }  // namespace constrained_window
 
 #endif  // COMPONENTS_CONSTRAINED_WINDOW_NATIVE_WEB_CONTENTS_MODAL_DIALOG_MANAGER_VIEWS_H_