// 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_OMNIBOX_OMNIBOX_POPUP_VIEW_GTK_H_
#define CHROME_BROWSER_UI_GTK_OMNIBOX_OMNIBOX_POPUP_VIEW_GTK_H_

#include <gtk/gtk.h>

#include <map>
#include <string>

#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "chrome/browser/autocomplete/autocomplete_match.h"
#include "chrome/browser/ui/omnibox/omnibox_popup_view.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "ui/base/gtk/gtk_signal.h"
#include "ui/base/window_open_disposition.h"
#include "ui/gfx/font.h"

class AutocompleteResult;
class GtkThemeService;
class OmniboxEditModel;
class OmniboxPopupModel;
class OmniboxView;
class SkBitmap;

namespace gfx {
class Image;
}

class OmniboxPopupViewGtk : public OmniboxPopupView,
                            public content::NotificationObserver {
 public:
  OmniboxPopupViewGtk(const gfx::Font& font,
                      OmniboxView* omnibox_view,
                      OmniboxEditModel* edit_model,
                      GtkWidget* location_bar);
  virtual ~OmniboxPopupViewGtk();

  // Initializes the view.
  virtual void Init();

  // Overridden from OmniboxPopupView:
  virtual bool IsOpen() const OVERRIDE;
  virtual void InvalidateLine(size_t line) OVERRIDE;
  virtual void UpdatePopupAppearance() OVERRIDE;
  virtual gfx::Rect GetTargetBounds() OVERRIDE;
  virtual void PaintUpdatesNow() OVERRIDE;
  virtual void OnDragCanceled() OVERRIDE;

  // Overridden from content::NotificationObserver:
  virtual void Observe(int type,
                       const content::NotificationSource& source,
                       const content::NotificationDetails& details) OVERRIDE;

 protected:
  // Convert a y-coordinate to the closest line / result.
  size_t LineFromY(int y) const;

  // Return a Rect for the space for a result line.  This excludes the border,
  // but includes the padding.  This is the area that is colored for a
  // selection.
  gfx::Rect GetRectForLine(size_t line, int width) const;

  // Returns the number of hidden matches at the top of the popup. This is
  // non-zero when a verbatim match like search-what-you-typed is present but
  // should not be shown.
  size_t GetHiddenMatchCount() const;

  // Returns the current autocomplete result.
  virtual const AutocompleteResult& GetResult() const;

 private:
  // Be friendly for unit tests.
  friend class OmniboxPopupViewGtkTest;

  static void SetupLayoutForMatch(
      PangoLayout* layout,
      const base::string16& text,
      const AutocompleteMatch::ACMatchClassifications& classifications,
      const GdkColor* base_color,
      const GdkColor* dim_color,
      const GdkColor* url_color,
      const std::string& prefix_text);

  virtual void Show(size_t num_results);
  virtual void Hide();

  // Restack the popup window directly above the browser's toplevel window.
  void StackWindow();

  // Accept a line of the results, for example, when the user clicks a line.
  void AcceptLine(size_t line, WindowOpenDisposition disposition);

  // Returns the appropriate icon to display beside |match|.
  gfx::Image IconForMatch(const AutocompleteMatch& match,
                          bool selected,
                          bool is_selected_keyword);

  // Returns the |index|th element of match, unless we're selected and showing
  // the associated keyword match.
  void GetVisibleMatchForInput(size_t index,
                               const AutocompleteMatch** match,
                               bool* is_selected_keyword);

  CHROMEGTK_CALLBACK_1(OmniboxPopupViewGtk, gboolean, HandleMotion,
                       GdkEventMotion*);

  CHROMEGTK_CALLBACK_1(OmniboxPopupViewGtk, gboolean, HandleButtonPress,
                       GdkEventButton*);

  CHROMEGTK_CALLBACK_1(OmniboxPopupViewGtk, gboolean, HandleButtonRelease,
                       GdkEventButton*);

  CHROMEGTK_CALLBACK_1(OmniboxPopupViewGtk, gboolean, HandleExpose,
                       GdkEventExpose*);

  scoped_ptr<OmniboxPopupModel> model_;
  OmniboxView* omnibox_view_;
  GtkWidget* location_bar_;

  // Our popup window, which is the only widget used, and we paint it on our
  // own.  This widget shouldn't be exposed outside of this class.
  GtkWidget* window_;
  // The pango layout object created from the window, cached across exposes.
  PangoLayout* layout_;

  GtkThemeService* theme_service_;
  content::NotificationRegistrar registrar_;

  // Font used for suggestions after being derived from the constructor's
  // |font|.
  gfx::Font font_;

  // A list of colors which we should use for drawing the popup. These change
  // between gtk and normal mode.
  GdkColor border_color_;
  GdkColor background_color_;
  GdkColor selected_background_color_;
  GdkColor hovered_background_color_;
  GdkColor content_text_color_;
  GdkColor selected_content_text_color_;
  GdkColor content_dim_text_color_;
  GdkColor selected_content_dim_text_color_;
  GdkColor url_text_color_;
  GdkColor url_selected_text_color_;

  // If the user cancels a dragging action (i.e. by pressing ESC), we don't have
  // a convenient way to release mouse capture. Instead we use this flag to
  // simply ignore all remaining drag events, and the eventual mouse release
  // event. Since OnDragCanceled() can be called when we're not dragging, this
  // flag is reset to false on a mouse pressed event, to make sure we don't
  // erroneously ignore the next drag.
  bool ignore_mouse_drag_;

  // Whether our popup is currently open / shown, or closed / hidden.
  bool opened_;

  DISALLOW_COPY_AND_ASSIGN(OmniboxPopupViewGtk);
};

#endif  // CHROME_BROWSER_UI_GTK_OMNIBOX_OMNIBOX_POPUP_VIEW_GTK_H_