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// Copyright (c) 2013 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_PROCESS_SINGLETON_MODAL_DIALOG_LOCK_H_
#define CHROME_BROWSER_PROCESS_SINGLETON_MODAL_DIALOG_LOCK_H_
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "chrome/browser/process_singleton.h"
#include "ui/gfx/native_widget_types.h"
namespace base {
class CommandLine;
class FilePath;
}
// Provides a ProcessSingleton::NotificationCallback that prevents
// command-line handling when a modal dialog is active during startup. The
// client must ensure that SetActiveModalDialog is called appropriately when
// such dialogs are displayed or dismissed.
//
// While a dialog is active, the ProcessSingleton notification
// callback will handle but ignore notifications:
// 1. Neither this process nor the invoking process will handle the command
// line.
// 2. The active dialog is brought to the foreground and/or the taskbar icon
// flashed (using ::SetForegroundWindow on Windows).
//
// Otherwise, the notification is forwarded to a wrapped NotificationCallback.
class ProcessSingletonModalDialogLock {
public:
typedef base::Callback<void(gfx::NativeWindow)> SetForegroundWindowHandler;
explicit ProcessSingletonModalDialogLock(
const ProcessSingleton::NotificationCallback& original_callback);
ProcessSingletonModalDialogLock(
const ProcessSingleton::NotificationCallback& original_callback,
const SetForegroundWindowHandler& set_foreground_window_handler);
~ProcessSingletonModalDialogLock();
// Receives a handle to the active modal dialog, or NULL if the active dialog
// is dismissed.
void SetActiveModalDialog(gfx::NativeWindow active_dialog);
// Returns the ProcessSingleton::NotificationCallback.
// The callback is only valid during the lifetime of the
// ProcessSingletonModalDialogLock instance.
ProcessSingleton::NotificationCallback AsNotificationCallback();
private:
bool NotificationCallbackImpl(const base::CommandLine& command_line,
const base::FilePath& current_directory);
gfx::NativeWindow active_dialog_;
ProcessSingleton::NotificationCallback original_callback_;
SetForegroundWindowHandler set_foreground_window_handler_;
DISALLOW_COPY_AND_ASSIGN(ProcessSingletonModalDialogLock);
};
#endif // CHROME_BROWSER_PROCESS_SINGLETON_MODAL_DIALOG_LOCK_H_
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