/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Copyright (C) 2016 Richard Moore ** Copyright (C) 2016 David Faure ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 3 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL3 included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 3 requirements ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 2.0 or (at your option) the GNU General ** Public license version 3 or any later version approved by the KDE Free ** Qt Foundation. The licenses are as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-2.0.html and ** https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ // // An implementation of QX11Info for Qt5. This code only provides the // static methods of the QX11Info, not the methods for getting information // about particular widgets or pixmaps. // #include "qx11info_x11.h" #include #include #include #include #include #include #include #include QT_BEGIN_NAMESPACE static QScreen *findScreenForVirtualDesktop(int virtualDesktopNumber) { const auto screens = QGuiApplication::screens(); for (QScreen *screen : screens) { if (QXcbScreenFunctions::virtualDesktopNumber(screen) == virtualDesktopNumber) return screen; } return nullptr; } /*! \class QX11Info \inmodule QtX11Extras \since 5.1 \brief Provides information about the X display configuration. The class provides two APIs: a set of non-static functions that provide information about a specific widget or pixmap, and a set of static functions that provide the default information for the application. \warning This class is only available on X11. For querying per-screen information in a portable way, use QDesktopWidget. */ /*! Constructs an empty QX11Info object. */ QX11Info::QX11Info() { } /*! Returns true if the application is currently running on X11. \since 5.2 */ bool QX11Info::isPlatformX11() { return QGuiApplication::platformName() == QLatin1String("xcb"); } /*! Returns the horizontal resolution of the given \a screen in terms of the number of dots per inch. The \a screen argument is an X screen number. Be aware that if the user's system uses Xinerama (as opposed to traditional X11 multiscreen), there is only one X screen. Use QDesktopWidget to query for information about Xinerama screens. \sa appDpiY() */ int QX11Info::appDpiX(int screen) { if (screen == -1) { const QScreen *scr = QGuiApplication::primaryScreen(); if (!scr) return 75; return qRound(scr->logicalDotsPerInchX()); } QScreen *scr = findScreenForVirtualDesktop(screen); if (!scr) return 0; return scr->logicalDotsPerInchX(); } /*! Returns the vertical resolution of the given \a screen in terms of the number of dots per inch. The \a screen argument is an X screen number. Be aware that if the user's system uses Xinerama (as opposed to traditional X11 multiscreen), there is only one X screen. Use QDesktopWidget to query for information about Xinerama screens. \sa appDpiX() */ int QX11Info::appDpiY(int screen) { if (screen == -1) { const QScreen *scr = QGuiApplication::primaryScreen(); if (!scr) return 75; return qRound(scr->logicalDotsPerInchY()); } QScreen *scr = findScreenForVirtualDesktop(screen); if (!scr) return 0; return scr->logicalDotsPerInchY(); } /*! Returns a handle for the applications root window on the given \a screen. The \a screen argument is an X screen number. Be aware that if the user's system uses Xinerama (as opposed to traditional X11 multiscreen), there is only one X screen. Use QDesktopWidget to query for information about Xinerama screens. \sa QApplication::desktop() */ unsigned long QX11Info::appRootWindow(int screen) { if (!qApp) return 0; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return 0; QScreen *scr = screen == -1 ? QGuiApplication::primaryScreen() : findScreenForVirtualDesktop(screen); if (!scr) return 0; return static_cast(reinterpret_cast(native->nativeResourceForScreen(QByteArrayLiteral("rootwindow"), scr))); } /*! Returns the number of the screen where the application is being displayed. This method refers to screens in the original X11 meaning with a different DISPLAY environment variable per screen. This information is only useful if your application needs to know on which X screen it is running. In a typical multi-head configuration, multiple physical monitors are combined in one X11 screen. This means this method returns the same number for each of the physical monitors. In such a setup you are interested in the monitor information as provided by the X11 RandR extension. This is available through QDesktopWidget and QScreen. \sa display() */ int QX11Info::appScreen() { if (!qApp) return 0; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return 0; return reinterpret_cast(native->nativeResourceForIntegration(QByteArrayLiteral("x11screen"))); } /*! Returns the X11 time. \sa setAppTime(), appUserTime() */ unsigned long QX11Info::appTime() { if (!qApp) return 0; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return 0; QScreen* screen = QGuiApplication::primaryScreen(); return static_cast(reinterpret_cast(native->nativeResourceForScreen("apptime", screen))); } /*! Returns the X11 user time. \sa setAppUserTime(), appTime() */ unsigned long QX11Info::appUserTime() { if (!qApp) return 0; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return 0; QScreen* screen = QGuiApplication::primaryScreen(); return static_cast(reinterpret_cast(native->nativeResourceForScreen("appusertime", screen))); } /*! Sets the X11 time to the value specified by \a time. \sa appTime(), setAppUserTime() */ void QX11Info::setAppTime(unsigned long time) { if (!qApp) return; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return; typedef void (*SetAppTimeFunc)(QScreen *, xcb_timestamp_t); QScreen* screen = QGuiApplication::primaryScreen(); SetAppTimeFunc func = reinterpret_cast(native->nativeResourceFunctionForScreen("setapptime")); if (func) func(screen, time); else qWarning("Internal error: QPA plugin doesn't implement setAppTime"); } /*! Sets the X11 user time as specified by \a time. \sa appUserTime(), setAppTime() */ void QX11Info::setAppUserTime(unsigned long time) { if (!qApp) return; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return; typedef void (*SetAppUserTimeFunc)(QScreen *, xcb_timestamp_t); QScreen* screen = QGuiApplication::primaryScreen(); SetAppUserTimeFunc func = reinterpret_cast(native->nativeResourceFunctionForScreen("setappusertime")); if (func) func(screen, time); else qWarning("Internal error: QPA plugin doesn't implement setAppUserTime"); } /*! Fetches the current X11 time stamp from the X Server. This method creates a property notify event and blocks till it is received back from the X Server. \since 5.2 */ unsigned long QX11Info::getTimestamp() { if (!qApp) return 0; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return 0; QScreen* screen = QGuiApplication::primaryScreen(); return static_cast(reinterpret_cast(native->nativeResourceForScreen("gettimestamp", screen))); } /*! Returns the startup ID that will be used for the next window to be shown by this process. After the next window is shown, the next startup ID will be empty. http://standards.freedesktop.org/startup-notification-spec/startup-notification-latest.txt \since 5.4 \sa setNextStartupId() */ QByteArray QX11Info::nextStartupId() { if (!qApp) return 0; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return 0; return static_cast(native->nativeResourceForIntegration("startupid")); } /*! Sets the next startup ID to \a id. This is the startup ID that will be used for the next window to be shown by this process. The startup ID of the first window comes from the environment variable DESKTOP_STARTUP_ID. This method is useful for subsequent windows, when the request comes from another process (e.g. via DBus). \since 5.4 \sa nextStartupId() */ void QX11Info::setNextStartupId(const QByteArray &id) { if (!qApp) return; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return; typedef void (*SetStartupIdFunc)(const char*); SetStartupIdFunc func = reinterpret_cast(native->nativeResourceFunctionForIntegration("setstartupid")); if (func) func(id.constData()); else qWarning("Internal error: QPA plugin doesn't implement setStartupId"); } /*! Returns the default display for the application. \sa appScreen() */ Display *QX11Info::display() { if (!qApp) return NULL; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return NULL; void *display = native->nativeResourceForIntegration(QByteArray("display")); return reinterpret_cast(display); } /*! Returns the default XCB connection for the application. \sa display() */ xcb_connection_t *QX11Info::connection() { if (!qApp) return NULL; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return NULL; void *connection = native->nativeResourceForIntegration(QByteArray("connection")); return reinterpret_cast(connection); } /*! \since 5.7 Returns true if there is a compositing manager running for the connection attached to \a screen. If \a screen equals -1, the application's primary screen is used. */ bool QX11Info::isCompositingManagerRunning(int screen) { if (!qApp) return false; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return false; QScreen *scr = screen == -1 ? QGuiApplication::primaryScreen() : findScreenForVirtualDesktop(screen); if (!scr) { qWarning() << "isCompositingManagerRunning: Could not find screen number" << screen; return false; } return native->nativeResourceForScreen(QByteArray("compositingEnabled"), scr); } /*! Returns a new peeker id or -1 if some interal error has occurred. Each peeker id is associated with an index in the buffered native event queue. For more details see QX11Info::PeekOption and peekEventQueue(). \sa peekEventQueue(), removePeekerId() \since 5.10 */ qint32 QX11Info::generatePeekerId() { if (!qApp) return -1; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return -1; typedef qint32 (*GeneratePeekerIdFunc)(void); GeneratePeekerIdFunc generatepeekerid = reinterpret_cast( native->nativeResourceFunctionForIntegration("generatepeekerid")); if (!generatepeekerid) { qWarning("Internal error: QPA plugin doesn't implement generatePeekerId"); return -1; } return generatepeekerid(); } /*! Removes \a peekerId, which was earlier obtained via generatePeekerId(). Returns \c true on success or \c false if unknown peeker id was provided or some interal error has occurred. \sa generatePeekerId() \since 5.10 */ bool QX11Info::removePeekerId(qint32 peekerId) { if (!qApp) return false; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return false; typedef bool (*RemovePeekerIdFunc)(qint32); RemovePeekerIdFunc removePeekerId = reinterpret_cast( native->nativeResourceFunctionForIntegration("removepeekerid")); if (!removePeekerId) { qWarning("Internal error: QPA plugin doesn't implement removePeekerId"); return false; } return removePeekerId(peekerId); } /*! \enum QX11Info::PeekOption \brief An enum to tune the behavior of QX11Info::peekEventQueue(). \value PeekDefault Peek from the beginning of the buffered native event queue. A peeker id is optional with PeekDefault. If a peeker id is provided to peekEventQueue() when using PeekDefault, then peeking starts from the beginning of the queue, not from the cached index; thus, this can be used to manually reset a cached index to peek from the start of the queue. When this operation completes, the associated index will be updated to the new position in the queue. \value PeekFromCachedIndex QX11Info::peekEventQueue() can optimize the peeking algorithm by skipping events that it already has seen in earlier calls to peekEventQueue(). When control returns to the main event loop, which causes the buffered native event queue to be flushed to Qt's event queue, the cached indices are marked invalid and will be reset on the next access. The same is true if the program explicitly flushes the buffered native event queue by QCoreApplication::processEvents(). \since 5.10 */ /*! \typedef QX11Info::PeekerCallback Typedef for a pointer to a function with the following signature: \code bool (*PeekerCallback)(xcb_generic_event_t *event, void *peekerData); \endcode The \a event is a native XCB event. The \a peekerData is a pointer to data, passed in via peekEventQueue(). Return \c true from this function to stop examining the buffered native event queue or \c false to continue. \note A non-capturing lambda can serve as a PeekerCallback. \since 5.10 */ /*! \brief Peek into the buffered XCB event queue. You can call peekEventQueue() periodically, when your program is busy performing a long-running operation, to peek into the buffered native event queue. The more time the long-running operation blocks the program from returning control to the main event loop, the more events will accumulate in the buffered XCB event queue. Once control returns to the main event loop these events will be flushed to Qt's event queue, which is a separate event queue from the queue this function is peeking into. \note It is usually better to run CPU-intensive operations in a non-GUI thread, instead of blocking the main event loop. The buffered XCB event queue is populated from a non-GUI thread and therefore might be ahead of the current GUI state. To handle native events as they are processed by the GUI thread, see QAbstractNativeEventFilter::nativeEventFilter(). The \a peeker is a callback function as documented in PeekerCallback. The \a peekerData can be used to pass in arbitrary data to the \a peeker callback. The \a option is an enum that tunes the behavior of peekEventQueue(). The \a peekerId is used to track an index in the queue, for more details see QX11Info::PeekOption. There can be several indices, each tracked individually by a peeker id obtained via generatePeekerId(). This function returns \c true when the peeker has stopped the event proccesing by returning \c true from the callback. If there were no events in the buffered native event queue to peek at or all the events have been processed by the peeker, this function returns \c false. \sa generatePeekerId(), QAbstractNativeEventFilter::nativeEventFilter() \since 5.10 */ bool QX11Info::peekEventQueue(PeekerCallback peeker, void *peekerData, PeekOptions option, qint32 peekerId) { if (!peeker || !qApp) return false; QPlatformNativeInterface *native = qApp->platformNativeInterface(); if (!native) return false; typedef bool (*PeekEventQueueFunc)(PeekerCallback, void *, PeekOptions, qint32); PeekEventQueueFunc peekeventqueue = reinterpret_cast( native->nativeResourceFunctionForIntegration("peekeventqueue")); if (!peekeventqueue) { qWarning("Internal error: QPA plugin doesn't implement peekEventQueue"); return false; } return peekeventqueue(peeker, peekerData, option, peekerId); } QT_END_NAMESPACE