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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qdesktopservices.h"
#ifndef QT_NO_DESKTOPSERVICES
#include <qdebug.h>
#if defined(Q_WS_QWS)
#include "qdesktopservices_qws.cpp"
#elif defined(Q_WS_X11)
#include "qdesktopservices_x11.cpp"
#elif defined(Q_WS_WIN)
#include "qdesktopservices_win.cpp"
#elif defined(Q_WS_MAC)
#include "qdesktopservices_mac.cpp"
#elif defined(Q_WS_S60)
#include "qdesktopservices_s60.cpp"
#endif
#include <qhash.h>
#include <qobject.h>
#include <qcoreapplication.h>
#include <qurl.h>
#include <qmutex.h>
QT_BEGIN_NAMESPACE
class QOpenUrlHandlerRegistry : public QObject
{
Q_OBJECT
public:
inline QOpenUrlHandlerRegistry() : mutex(QMutex::Recursive) {}
QMutex mutex;
struct Handler
{
QObject *receiver;
QByteArray name;
};
typedef QHash<QString, Handler> HandlerHash;
HandlerHash handlers;
public Q_SLOTS:
void handlerDestroyed(QObject *handler);
};
Q_GLOBAL_STATIC(QOpenUrlHandlerRegistry, handlerRegistry)
void QOpenUrlHandlerRegistry::handlerDestroyed(QObject *handler)
{
HandlerHash::Iterator it = handlers.begin();
while (it != handlers.end()) {
if (it->receiver == handler) {
it = handlers.erase(it);
} else {
++it;
}
}
}
/*!
\class QDesktopServices
\brief The QDesktopServices class provides methods for accessing common desktop services.
\since 4.2
\ingroup desktop
Many desktop environments provide services that can be used by applications to
perform common tasks, such as opening a web page, in a way that is both consistent
and takes into account the user's application preferences.
This class contains functions that provide simple interfaces to these services
that indicate whether they succeeded or failed.
The openUrl() function is used to open files located at arbitrary URLs in external
applications. For URLs that correspond to resources on the local filing system
(where the URL scheme is "file"), a suitable application will be used to open the
file; otherwise, a web browser will be used to fetch and display the file.
The user's desktop settings control whether certain executable file types are
opened for browsing, or if they are executed instead. Some desktop environments
are configured to prevent users from executing files obtained from non-local URLs,
or to ask the user's permission before doing so.
\section1 URL Handlers
The behavior of the openUrl() function can be customized for individual URL
schemes to allow applications to override the default handling behavior for
certain types of URLs.
The dispatch mechanism allows only one custom handler to be used for each URL
scheme; this is set using the setUrlHandler() function. Each handler is
implemented as a slot which accepts only a single QUrl argument.
The existing handlers for each scheme can be removed with the
unsetUrlHandler() function. This returns the handling behavior for the given
scheme to the default behavior.
This system makes it easy to implement a help system, for example. Help could be
provided in labels and text browsers using \gui{help://myapplication/mytopic}
URLs, and by registering a handler it becomes possible to display the help text
inside the application:
\snippet doc/src/snippets/code/src_gui_util_qdesktopservices.cpp 0
If inside the handler you decide that you can't open the requested
URL, you can just call QDesktopServices::openUrl() again with the
same argument, and it will try to open the URL using the
appropriate mechanism for the user's desktop environment.
\sa QSystemTrayIcon, QProcess
*/
/*!
Opens the given \a url in the appropriate Web browser for the user's desktop
environment, and returns true if successful; otherwise returns false.
If the URL is a reference to a local file (i.e., the URL scheme is "file") then
it will be opened with a suitable application instead of a Web browser.
The following example opens a file on the Windows file system residing on a path
that contains spaces:
\snippet doc/src/snippets/code/src_gui_util_qdesktopservices.cpp 2
If a \c mailto URL is specified, the user's e-mail client will be used to open a
composer window containing the options specified in the URL, similar to the way
\c mailto links are handled by a Web browser.
For example, the following URL contains a recipient (\c{user@foo.com}), a
subject (\c{Test}), and a message body (\c{Just a test}):
\snippet doc/src/snippets/code/src_gui_util_qdesktopservices.cpp 1
\warning Although many e-mail clients can send attachments and are
Unicode-aware, the user may have configured their client without these features.
Also, certain e-mail clients (e.g., Lotus Notes) have problems with long URLs.
\sa setUrlHandler()
*/
bool QDesktopServices::openUrl(const QUrl &url)
{
QOpenUrlHandlerRegistry *registry = handlerRegistry();
QMutexLocker locker(®istry->mutex);
static bool insideOpenUrlHandler = false;
if (!insideOpenUrlHandler) {
QOpenUrlHandlerRegistry::HandlerHash::ConstIterator handler = registry->handlers.constFind(url.scheme());
if (handler != registry->handlers.constEnd()) {
insideOpenUrlHandler = true;
bool result = QMetaObject::invokeMethod(handler->receiver, handler->name.constData(), Qt::DirectConnection, Q_ARG(QUrl, url));
insideOpenUrlHandler = false;
return result; // ### support bool slot return type
}
}
bool result;
if (url.scheme() == QLatin1String("file"))
result = openDocument(url);
else
result = launchWebBrowser(url);
return result;
}
/*!
Sets the handler for the given \a scheme to be the handler \a method provided by
the \a receiver object.
This function provides a way to customize the behavior of openUrl(). If openUrl()
is called with a URL with the specified \a scheme then the given \a method on the
\a receiver object is called instead of QDesktopServices launching an external
application.
The provided method must be implemented as a slot that only accepts a single QUrl
argument.
If setUrlHandler() is used to set a new handler for a scheme which already
has a handler, the existing handler is simply replaced with the new one.
Since QDesktopServices does not take ownership of handlers, no objects are
deleted when a handler is replaced.
Note that the handler will always be called from within the same thread that
calls QDesktopServices::openUrl().
\sa openUrl(), unsetUrlHandler()
*/
void QDesktopServices::setUrlHandler(const QString &scheme, QObject *receiver, const char *method)
{
QOpenUrlHandlerRegistry *registry = handlerRegistry();
QMutexLocker locker(®istry->mutex);
if (!receiver) {
registry->handlers.remove(scheme);
return;
}
QOpenUrlHandlerRegistry::Handler h;
h.receiver = receiver;
h.name = method;
registry->handlers.insert(scheme, h);
QObject::connect(receiver, SIGNAL(destroyed(QObject*)),
registry, SLOT(handlerDestroyed(QObject*)));
}
/*!
Removes a previously set URL handler for the specified \a scheme.
\sa setUrlHandler()
*/
void QDesktopServices::unsetUrlHandler(const QString &scheme)
{
setUrlHandler(scheme, 0, 0);
}
/*!
\enum QDesktopServices::StandardLocation
\since 4.4
This enum describes the different locations that can be queried by
QDesktopServices::storageLocation and QDesktopServices::displayName.
\value DesktopLocation Returns the user's desktop directory.
\value DocumentsLocation Returns the user's document.
\value FontsLocation Returns the user's fonts.
\value ApplicationsLocation Returns the user's applications.
\value MusicLocation Returns the users music.
\value MoviesLocation Returns the user's movies.
\value PicturesLocation Returns the user's pictures.
\value TempLocation Returns the system's temporary directory.
\value HomeLocation Returns the user's home directory.
\value DataLocation Returns a directory location where persistent
application data can be stored. QCoreApplication::applicationName
and QCoreApplication::organizationName should work on all
platforms.
\value CacheLocation Returns a directory location where user-specific
non-essential (cached) data should be written.
\sa storageLocation() displayName()
*/
/*!
\fn QString QDesktopServices::storageLocation(StandardLocation type)
\since 4.4
Returns the default system directory where files of \a type belong, or an empty string
if the location cannot be determined.
\note The storage location returned can be a directory that does not exist; i.e., it
may need to be created by the system or the user.
\note On Symbian OS, DataLocation and ApplicationsLocation always point to appropriate
folder on same drive with executable. FontsLocation always points to folder on ROM drive.
Rest of the standard locations point to folder on same drive with executable, except
that if executable is in ROM the folder from C drive is returned.
\note On Mac OS X, DataLocation does not include QCoreApplication::organizationName.
Use code like this to add it:
\code
QString location = QDesktopServices::storageLocation(QDesktopServices::DataLocation);
#ifdef Q_WS_MAC
location.insert(location.count() - QCoreApplication::applicationName().count(),
QCoreApplication::organizationName() + "/");
#endif
\endcode
*/
/*!
\fn QString QDesktopServices::displayName(StandardLocation type)
Returns a localized display name for the given location \a type or
an empty QString if no relevant location can be found.
*/
QT_END_NAMESPACE
#include "qdesktopservices.moc"
#endif // QT_NO_DESKTOPSERVICES
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