// 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 CHROME_BROWSER_UI_GTK_CONSTRAINED_WINDOW_GTK_H_
#define CHROME_BROWSER_UI_GTK_CONSTRAINED_WINDOW_GTK_H_

#include <gtk/gtk.h>

#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/ui/constrained_window.h"
#include "ui/base/gtk/gtk_signal.h"
#include "ui/base/gtk/owned_widget_gtk.h"

class TabContents;
typedef struct _GdkColor GdkColor;
class ChromeWebContentsViewDelegateGtk;

class ConstrainedWindowGtkDelegate {
 public:
  // Returns the widget that will be put in the constrained window's container.
  virtual GtkWidget* GetWidgetRoot() = 0;

  // Returns the widget that should get focus when ConstrainedWindow is focused.
  virtual GtkWidget* GetFocusWidget() = 0;

  // Tells the delegate to either delete itself or set up a task to delete
  // itself later.
  virtual void DeleteDelegate() = 0;

  virtual bool GetBackgroundColor(GdkColor* color);

  // Returns true if hosting ConstrainedWindowGtk should apply default padding.
  virtual bool ShouldHaveBorderPadding() const;

 protected:
  virtual ~ConstrainedWindowGtkDelegate();
};

// Constrained window implementation for the GTK port. Unlike the Win32 system,
// ConstrainedWindowGtk doesn't draw draggable fake windows and instead just
// centers the dialog. It is thus an order of magnitude simpler.
class ConstrainedWindowGtk : public ConstrainedWindow {
 public:
  typedef ChromeWebContentsViewDelegateGtk TabContentsViewType;

  ConstrainedWindowGtk(TabContents* tab_contents,
                       ConstrainedWindowGtkDelegate* delegate);
  virtual ~ConstrainedWindowGtk();

  // Overridden from ConstrainedWindow:
  virtual void ShowConstrainedWindow() OVERRIDE;
  virtual void CloseConstrainedWindow() OVERRIDE;
  virtual void FocusConstrainedWindow() OVERRIDE;

  // Returns the TabContents that constrains this Constrained Window.
  TabContents* owner() const { return tab_contents_; }

  // Returns the toplevel widget that displays this "window".
  GtkWidget* widget() { return border_.get(); }

  // Returns the View that we collaborate with to position ourselves.
  TabContentsViewType* ContainingView();

 private:
  friend class ConstrainedWindow;

  // Signal callbacks.
  CHROMEGTK_CALLBACK_1(ConstrainedWindowGtk, gboolean, OnKeyPress,
                       GdkEventKey*);
  CHROMEGTK_CALLBACK_1(ConstrainedWindowGtk, void, OnHierarchyChanged,
                       GtkWidget*);

  // The TabContents that owns and constrains this ConstrainedWindow.
  TabContents* tab_contents_;

  // The top level widget container that exports to our WebContentsView.
  ui::OwnedWidgetGtk border_;

  // Delegate that provides the contents of this constrained window.
  ConstrainedWindowGtkDelegate* delegate_;

  // Stores if |ShowConstrainedWindow()| has been called.
  bool visible_;

  base::WeakPtrFactory<ConstrainedWindowGtk> weak_factory_;

  DISALLOW_COPY_AND_ASSIGN(ConstrainedWindowGtk);
};

#endif  // CHROME_BROWSER_UI_GTK_CONSTRAINED_WINDOW_GTK_H_