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app_modal_dialog_queue.h

// Copyright (c) 2006-2008 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_APP_MODAL_DIALOG_QUEUE_H_
#define CHROME_BROWSER_APP_MODAL_DIALOG_QUEUE_H_

#include <queue>

#include "base/singleton.h"
#include "chrome/browser/app_modal_dialog.h"

// Keeps a queue of AppModalDialogs, making sure only one app modal
// dialog is shown at a time.
// This class is a singleton.
class AppModalDialogQueue {
 public:
  // Adds a modal dialog to the queue, if there are no other dialogs in the
  // queue, the dialog will be shown immediately. Once it is shown, the
  // most recently active browser window (or whichever is currently active)
  // will be app modal, meaning it will be activated if the user tries to
  // activate any other browser windows. So the dialog being shown should
  // assure it is the child of BrowserList::GetLastActive() so that it is
  // activated as well. See browser_list.h for more notes about our somewhat
  // sloppy app modality.
  // Note: The AppModalDialog |dialog| must be window modal before it
  // can be added as app modal.
  void AddDialog(AppModalDialog* dialog);

  // Removes the current dialog in the queue (the one that is being shown).
  // Shows the next dialog in the queue, if any is present. This does not
  // ensure that the currently showing dialog is closed, it just makes it no
  // longer app modal.
  void ShowNextDialog();

  // Activates and shows the current dialog, if the user clicks on one of the
  // windows disabled by the presence of an app modal dialog. This forces
  // the window to be visible on the display even if desktop manager software
  // opened the dialog on another virtual desktop. Assumes there is currently a
  // dialog being shown. (Call BrowserList::IsShowingAppModalDialog to test
  // this condition).
  void ActivateModalDialog();

  // Returns true if there is currently an active app modal dialog box.
  bool HasActiveDialog() {
    return active_dialog_ != NULL;
  }

  // Accessor for |active_dialog_|.
  AppModalDialog* active_dialog() {
    return active_dialog_;
  }

 private:
  friend struct DefaultSingletonTraits<AppModalDialogQueue>;

  AppModalDialogQueue() : active_dialog_(NULL), showing_modal_dialog_(false) {}

  // Shows |dialog| and notifies the BrowserList that a modal dialog is showing.
  void ShowModalDialog(AppModalDialog* dialog);

  // Returns the next dialog to show. This removes entries from
  // app_modal_dialog_queue_ until one is valid or the queue is empty. This
  // returns NULL if there are no more dialogs, or all the dialogs in the queue
  // are not valid.
  AppModalDialog* GetNextDialog();

  // Contains all app modal dialogs which are waiting to be shown, with the
  // currently modal dialog at the front of the queue.
  std::queue<AppModalDialog*> app_modal_dialog_queue_;

  // The currently active app-modal dialog box's delegate. NULL if there is no
  // active app-modal dialog box.
  AppModalDialog* active_dialog_;

  // Stores if |ShowModalDialog()| is currently being called on an app-modal
  // dialog.
  bool showing_modal_dialog_;

  DISALLOW_COPY_AND_ASSIGN(AppModalDialogQueue);
};

#endif  // CHROME_BROWSER_APP_MODAL_DIALOG_QUEUE_H_

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