// 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.

// This file defines the interface class OmniboxView.  Each toolkit will
// implement the edit view differently, so that code is inherently platform
// specific.  However, the OmniboxEditModel needs to do some communication with
// the view.  Since the model is shared between platforms, we need to define an
// interface that all view implementations will share.

#ifndef CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_VIEW_H_
#define CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_VIEW_H_

#include <string>

#include "base/string16.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/autocomplete/autocomplete_match.h"
#include "chrome/browser/ui/omnibox/omnibox_edit_model.h"
#include "chrome/browser/ui/toolbar/toolbar_model.h"
#include "content/public/common/url_constants.h"
#include "ui/base/window_open_disposition.h"
#include "ui/gfx/native_widget_types.h"

class CommandUpdater;
class GURL;
class OmniboxEditController;
class OmniboxViewMacTest;
class Profile;
class ToolbarModel;

namespace content {
class WebContents;
}

#if defined(TOOLKIT_VIEWS)
// TODO(beng): Move all views-related code to a views-specific sub-interface.
namespace gfx {
class Font;
}

namespace views {
class View;
}

namespace ui {
class DropTargetEvent;
}
#endif

class OmniboxView {
 public:
  virtual ~OmniboxView();

  // Used by the automation system for getting at the model from the view.
  OmniboxEditModel* model() { return model_.get(); }
  const OmniboxEditModel* model() const { return model_.get(); }

  CommandUpdater* command_updater() { return command_updater_; }
  const CommandUpdater* command_updater() const { return command_updater_; }

  ToolbarModel* toolbar_model() { return toolbar_model_; }
  const ToolbarModel* toolbar_model() const { return toolbar_model_; }

  // For use when switching tabs, this saves the current state onto the tab so
  // that it can be restored during a later call to Update().
  virtual void SaveStateToTab(content::WebContents* tab) = 0;

  // Called when any LocationBarView state changes. If
  // |tab_for_state_restoring| is non-NULL, it points to a WebContents whose
  // state we should restore.
  virtual void Update(const content::WebContents* tab_for_state_restoring) = 0;

  // Asks the browser to load the specified match's |destination_url|, which
  // is assumed to be one of the popup entries, using the supplied disposition
  // and transition type. |alternate_nav_url|, if non-empty, contains the
  // alternate navigation URL for for this match. See comments on
  // AutocompleteResult::GetAlternateNavURL().
  //
  // |selected_line| is passed to SendOpenNotification(); see comments there.
  //
  // This may close the popup.
  virtual void OpenMatch(const AutocompleteMatch& match,
                         WindowOpenDisposition disposition,
                         const GURL& alternate_nav_url,
                         size_t selected_line);

  // Returns the current text of the edit control, which could be the
  // "temporary" text set by the popup, the "permanent" text set by the
  // browser, or just whatever the user has currently typed.
  virtual string16 GetText() const = 0;

  // |true| if the user is in the process of editing the field, or if
  // the field is empty.
  bool IsEditingOrEmpty() const;

  // Returns the resource ID of the icon to show for the current text.
  int GetIcon() const;

  // The user text is the text the user has manually keyed in.  When present,
  // this is shown in preference to the permanent text; hitting escape will
  // revert to the permanent text.
  void SetUserText(const string16& text);
  virtual void SetUserText(const string16& text,
                           const string16& display_text,
                           bool update_popup);

  // Sets the window text and the caret position. |notify_text_changed| is true
  // if the model should be notified of the change.
  virtual void SetWindowTextAndCaretPos(const string16& text,
                                        size_t caret_pos,
                                        bool update_popup,
                                        bool notify_text_changed) = 0;

  // Sets the edit to forced query mode.  Practically speaking, this means that
  // if the edit is not in forced query mode, its text is set to "?" with the
  // cursor at the end, and if the edit is in forced query mode (its first
  // non-whitespace character is '?'), the text after the '?' is selected.
  //
  // In the future we should display the search engine UI for the default engine
  // rather than '?'.
  virtual void SetForcedQuery() = 0;

  // Returns true if all text is selected or there is no text at all.
  virtual bool IsSelectAll() const = 0;

  // Returns true if the user deleted the suggested text.
  virtual bool DeleteAtEndPressed() = 0;

  // Fills |start| and |end| with the indexes of the current selection's bounds.
  // It is not guaranteed that |*start < *end|, as the selection can be
  // directed.  If there is no selection, |start| and |end| will both be equal
  // to the current cursor position.
  virtual void GetSelectionBounds(size_t* start, size_t* end) const = 0;

  // Selects all the text in the edit.  Use this in place of SetSelAll() to
  // avoid selecting the "phantom newline" at the end of the edit.
  virtual void SelectAll(bool reversed) = 0;

  // Reverts the edit and popup back to their unedited state (permanent text
  // showing, popup closed, no user input in progress).
  virtual void RevertAll();

  // Updates the autocomplete popup and other state after the text has been
  // changed by the user.
  virtual void UpdatePopup() = 0;

  // Closes the autocomplete popup, if it's open. The name |ClosePopup|
  // conflicts with the OSX class override as that has a base class that also
  // defines a method with that name.
  virtual void CloseOmniboxPopup();

  // Sets the focus to the autocomplete view.
  virtual void SetFocus() = 0;

  // Shows or hides the caret based on whether the model's is_caret_visible() is
  // true.
  virtual void ApplyCaretVisibility() = 0;

  // Called when the temporary text in the model may have changed.
  // |display_text| is the new text to show; |save_original_selection| is true
  // when there wasn't previously a temporary text and thus we need to save off
  // the user's existing selection. |notify_text_changed| is true if the model
  // should be notified of the change.
  virtual void OnTemporaryTextMaybeChanged(const string16& display_text,
                                           bool save_original_selection,
                                           bool notify_text_changed) = 0;

  // Called when the inline autocomplete text in the model may have changed.
  // |display_text| is the new text to show; |user_text_length| is the length of
  // the user input portion of that (so, up to but not including the inline
  // autocompletion).  Returns whether the display text actually changed.
  virtual bool OnInlineAutocompleteTextMaybeChanged(
      const string16& display_text, size_t user_text_length) = 0;

  // Called when the temporary text has been reverted by the user.  This will
  // reset the user's original selection.
  virtual void OnRevertTemporaryText() = 0;

  // Checkpoints the current edit state before an operation that might trigger
  // a new autocomplete run to open or modify the popup. Call this before
  // user-initiated edit actions that trigger autocomplete, but *not* for
  // automatic changes to the textfield that should not affect autocomplete.
  virtual void OnBeforePossibleChange() = 0;
  // OnAfterPossibleChange() returns true if there was a change that caused it
  // to call UpdatePopup().
  virtual bool OnAfterPossibleChange() = 0;

  // Returns the gfx::NativeView of the edit view.
  virtual gfx::NativeView GetNativeView() const = 0;

  // Gets the relative window for the pop up window of OmniboxPopupView. The pop
  // up window will be shown under the relative window. When an IME is attached
  // to the rich edit control, the IME window is the relative window. Otherwise,
  // the top-most window is the relative window.
  virtual gfx::NativeView GetRelativeWindowForPopup() const = 0;

  // Shows the instant suggestion text.
  virtual void SetInstantSuggestion(const string16& input) = 0;

  // Returns the current instant suggestion text.
  virtual string16 GetInstantSuggestion() const = 0;

  // Returns the width in pixels needed to display the current text. The
  // returned value includes margins.
  virtual int TextWidth() const = 0;

  // Returns true if the user is composing something in an IME.
  virtual bool IsImeComposing() const = 0;

#if defined(TOOLKIT_VIEWS)
  virtual int GetMaxEditWidth(int entry_width) const = 0;

  // Adds the autocomplete edit view to view hierarchy and
  // returns the views::View of the edit view.
  virtual views::View* AddToView(views::View* parent) = 0;

  // Performs the drop of a drag and drop operation on the view.
  virtual int OnPerformDrop(const ui::DropTargetEvent& event) = 0;

  // Returns the font.
  virtual gfx::Font GetFont() = 0;

  // Returns the width in pixels needed to display the text from one character
  // before the caret to the end of the string.
  virtual int WidthOfTextAfterCursor() = 0;
#endif

  // Returns a string with any leading javascript schemas stripped from the
  // input text.
  static string16 StripJavascriptSchemas(const string16& text);

  // Returns the current clipboard contents as a string that can be pasted in.
  // In addition to just getting CF_UNICODETEXT out, this can also extract URLs
  // from bookmarks on the clipboard.
  static string16 GetClipboardText();

 protected:
  OmniboxView(Profile* profile,
              OmniboxEditController* controller,
              ToolbarModel* toolbar_model,
              CommandUpdater* command_updater);

  // Internally invoked whenever the text changes in some way.
  virtual void TextChanged();

  // Return the number of characters in the current buffer. The name
  // |GetTextLength| can't be used as the Windows override of this class
  // inherits from a class that defines a method with that name.
  virtual int GetOmniboxTextLength() const = 0;

  // Try to parse the current text as a URL and colorize the components.
  virtual void EmphasizeURLComponents() = 0;

  OmniboxEditController* controller() { return controller_; }

 private:
  friend class OmniboxViewMacTest;

  // |model_| can be NULL in tests.
  scoped_ptr<OmniboxEditModel> model_;
  OmniboxEditController* controller_;
  ToolbarModel* toolbar_model_;

  // The object that handles additional command functionality exposed on the
  // edit, such as invoking the keyword editor.
  CommandUpdater* command_updater_;
};

#endif  // CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_VIEW_H_