QXlibClipboard Class Reference

#include <qxlibclipboard.h>

Inheritance diagram for QXlibClipboard:

Public Functions
QByteArray	clipboardReadIncrementalProperty (Window win, Atom property, int nbytes, bool nullterm)
bool	clipboardReadProperty (Window win, Atom property, bool deleteProperty, QByteArray *buffer, int *size, Atom *type, int *format) const
QByteArray	getDataInFormat (Atom modeAtom, Atom fmtatom)
void	handleSelectionRequest (XEvent *event)
QMimeData *	mimeData (QClipboard::Mode mode)
Window	owner () const
	QXlibClipboard (QXlibScreen *screen)
Window	requestor () const
QXlibScreen *	screen () const
void	setMimeData (QMimeData *data, QClipboard::Mode mode)
void	setRequestor (Window window)
bool	supportsMode (QClipboard::Mode mode) const
Public Functions inherited from QPlatformClipboard
void	emitChanged (QClipboard::Mode mode)
virtual	~QPlatformClipboard ()

Private Functions
Atom	sendSelection (QMimeData *d, Atom target, Window window, Atom property)
Atom	sendTargetsSelection (QMimeData *d, Window window, Atom property)
void	setOwner (Window window)

Properties
QMimeData *	m_clientClipboard
QMimeData *	m_clientSelection
Window	m_owner
Window	m_requestor
QXlibScreen *	m_screen
QMimeData *	m_xClipboard
QMimeData *	m_xSelection

Static Private Attributes
static const int	clipboard_timeout = 5000

Detailed Description

Definition at line 49 of file qxlibclipboard.h.

Constructors and Destructors

QXlibClipboard()

QXlibClipboard::QXlibClipboard

(

QXlibScreen *

screen

)

Definition at line 152 of file qxlibclipboard.cpp.

    : QPlatformClipboard()
    , m_screen(screen)
    , m_xClipboard(0)
    , m_clientClipboard(0)
    , m_xSelection(0)
    , m_clientSelection(0)
    , m_requestor(XNone)
    , m_owner(XNone)
{
}

Functions

clipboardReadIncrementalProperty()

QByteArray QXlibClipboard::clipboardReadIncrementalProperty	(	Window	win,
		Atom	property,
		int	nbytes,
		bool	nullterm
	)

Definition at line 583 of file qxlibclipboard.cpp.

Referenced by getDataInFormat().

{
    XEvent event;

    QByteArray buf;
    QByteArray tmp_buf;
    bool alloc_error = false;
    int  length;
    int  offset = 0;

    if (nbytes > 0) {
        // Reserve buffer + zero-terminator (for text data)
        // We want to complete the INCR transfer even if we cannot
        // allocate more memory
        buf.resize(nbytes+1);
        alloc_error = buf.size() != nbytes+1;
    }

    for (;;) {
        screen()->display()->flush();
        if (!screen()->waitForClipboardEvent(win,PropertyNotify,&event,clipboard_timeout))
            break;
        if (event.xproperty.atom != property ||
             event.xproperty.state != PropertyNewValue)
            continue;
        if (clipboardReadProperty(win, property, true, &tmp_buf, &length, 0, 0)) {
            if (length == 0) {                // no more data, we're done
                if (nullterm) {
                    buf.resize(offset+1);
                    buf[offset] = '\0';
                } else {
                    buf.resize(offset);
                }
                return buf;
            } else if (!alloc_error) {
                if (offset+length > (int)buf.size()) {
                    buf.resize(offset+length+65535);
                    if (buf.size() != offset+length+65535) {
                        alloc_error = true;
                        length = buf.size() - offset;
                    }
                }
                memcpy(buf.data()+offset, tmp_buf.constData(), length);
                tmp_buf.resize(0);
                offset += length;
            }
        } else {
            break;
        }
    }

    // timed out ... create a new requestor window, otherwise the requestor
    // could consider next request to be still part of this timed out request
    setRequestor(0);

    return QByteArray();
}

clipboardReadProperty()

bool QXlibClipboard::clipboardReadProperty	(	Window	win,
		Atom	property,
		bool	deleteProperty,
		QByteArray *	buffer,
		int *	size,
		Atom *	type,
		int *	format
	)		const

Definition at line 471 of file qxlibclipboard.cpp.

Referenced by clipboardReadIncrementalProperty(), getDataInFormat(), and handleSelectionRequest().

{
    int    maxsize = maxSelectionIncr(screen()->display()->nativeDisplay());
    ulong  bytes_left; // bytes_after
    ulong  length;     // nitems
    uchar *data;
    Atom   dummy_type;
    int    dummy_format;
    int    r;

    if (!type)                                // allow null args
        type = &dummy_type;
    if (!format)
        format = &dummy_format;

    // Don't read anything, just get the size of the property data
    r = XGetWindowProperty(screen()->display()->nativeDisplay(), win, property, 0, 0, False,
                            AnyPropertyType, type, format,
                            &length, &bytes_left, &data);
    if (r != Success || (type && *type == XNone)) {
        buffer->resize(0);
        return false;
    }
    XFree((char*)data);

    int  offset = 0, buffer_offset = 0, format_inc = 1, proplen = bytes_left;

    switch (*format) {
    case 8:
    default:
        format_inc = sizeof(char) / 1;
        break;

    case 16:
        format_inc = sizeof(short) / 2;
        proplen *= sizeof(short) / 2;
        break;

    case 32:
        format_inc = sizeof(long) / 4;
        proplen *= sizeof(long) / 4;
        break;
    }

    int newSize = proplen;
    buffer->resize(newSize);

    bool ok = (buffer->size() == newSize);

    if (ok && newSize) {
        // could allocate buffer

        while (bytes_left) {
            // more to read...

            r = XGetWindowProperty(screen()->display()->nativeDisplay(), win, property, offset, maxsize/4,
                                   False, AnyPropertyType, type, format,
                                   &length, &bytes_left, &data);
            if (r != Success || (type && *type == XNone))
                break;

            offset += length / (32 / *format);
            length *= format_inc * (*format) / 8;

            // Here we check if we get a buffer overflow and tries to
            // recover -- this shouldn't normally happen, but it doesn't
            // hurt to be defensive
            if ((int)(buffer_offset + length) > buffer->size()) {
                length = buffer->size() - buffer_offset;

                // escape loop
                bytes_left = 0;
            }

            memcpy(buffer->data() + buffer_offset, data, length);
            buffer_offset += length;

            XFree((char*)data);
        }

        if (*format == 8 && *type == QXlibStatic::atom(QXlibStatic::COMPOUND_TEXT)) {
            // convert COMPOUND_TEXT to a multibyte string
            XTextProperty textprop;
            textprop.encoding = *type;
            textprop.format = *format;
            textprop.nitems = buffer_offset;
            textprop.value = (unsigned char *) buffer->data();

            char **list_ret = 0;
            int count;
            if (XmbTextPropertyToTextList(screen()->display()->nativeDisplay(), &textprop, &list_ret,
                         &count) == Success && count && list_ret) {
                offset = buffer_offset = strlen(list_ret[0]);
                buffer->resize(offset);
                memcpy(buffer->data(), list_ret[0], offset);
            }
            if (list_ret) XFreeStringList(list_ret);
        }
    }

    // correct size, not 0-term.
    if (size)
        *size = buffer_offset;

    if (deleteProperty)
        XDeleteProperty(screen()->display()->nativeDisplay(), win, property);

    screen()->display()->flush();

    return ok;
}

getDataInFormat()

QByteArray QXlibClipboard::getDataInFormat	(	Atom	modeAtom,
		Atom	fmtatom
	)

Definition at line 641 of file qxlibclipboard.cpp.

Referenced by QXlibClipboardMime::formats_sys().

{
    QByteArray buf;

    Window   win = requestor();

    XSelectInput(screen()->display()->nativeDisplay(), win, NoEventMask); // don't listen for any events

    XDeleteProperty(screen()->display()->nativeDisplay(), win, QXlibStatic::atom(QXlibStatic::_QT_SELECTION));
    XConvertSelection(screen()->display()->nativeDisplay(), modeAtom, fmtatom, QXlibStatic::atom(QXlibStatic::_QT_SELECTION), win, CurrentTime);
    screen()->display()->sync();

    XEvent xevent;
    if (!screen()->waitForClipboardEvent(win,SelectionNotify,&xevent,clipboard_timeout) ||
         xevent.xselection.property == XNone) {
        return buf;
    }

    Atom   type;
    XSelectInput(screen()->display()->nativeDisplay(), win, PropertyChangeMask);

    if (clipboardReadProperty(win, QXlibStatic::atom(QXlibStatic::_QT_SELECTION), true, &buf, 0, &type, 0)) {
        if (type == QXlibStatic::atom(QXlibStatic::INCR)) {
            int nbytes = buf.size() >= 4 ? *((int*)buf.data()) : 0;
            buf = clipboardReadIncrementalProperty(win, QXlibStatic::atom(QXlibStatic::_QT_SELECTION), nbytes, false);
        }
    }

    XSelectInput(screen()->display()->nativeDisplay(), win, NoEventMask);


    return buf;
}

handleSelectionRequest()

void QXlibClipboard::handleSelectionRequest

(

XEvent *

event

)

Definition at line 348 of file qxlibclipboard.cpp.

Referenced by QXlibScreen::handleSelectionRequest().

{
    XSelectionRequestEvent *req = &xevent->xselectionrequest;

    if (requestor() && req->requestor == requestor()) {
        qDebug() << "This should be caught before";
        return;
    }

    XEvent event;
    event.xselection.type      = SelectionNotify;
    event.xselection.display   = req->display;
    event.xselection.requestor = req->requestor;
    event.xselection.selection = req->selection;
    event.xselection.target    = req->target;
    event.xselection.property  = XNone;
    event.xselection.time      = req->time;

    QMimeData *d;
    if (req->selection == XA_PRIMARY) {
        d = m_clientSelection;
    } else if (req->selection == QXlibStatic::atom(QXlibStatic::CLIPBOARD)) {
        d = m_clientClipboard;
    } else {
        qWarning("QClipboard: Unknown selection '%lx'", req->selection);
        XSendEvent(screen()->display()->nativeDisplay(), req->requestor, False, NoEventMask, &event);
        return;
    }

    if (!d) {
        qWarning("QClipboard: Cannot transfer data, no data available");
        XSendEvent(screen()->display()->nativeDisplay(), req->requestor, False, NoEventMask, &event);
        return;
    }

    Atom xa_targets = QXlibStatic::atom(QXlibStatic::TARGETS);
    Atom xa_multiple = QXlibStatic::atom(QXlibStatic::MULTIPLE);
    Atom xa_timestamp = QXlibStatic::atom(QXlibStatic::TIMESTAMP);

    struct AtomPair { Atom target; Atom property; } *multi = 0;
    Atom multi_type = XNone;
    int multi_format = 0;
    int nmulti = 0;
    int imulti = -1;
    bool multi_writeback = false;

    if (req->target == xa_multiple) {
        QByteArray multi_data;
        if (req->property == XNone
            || !clipboardReadProperty(req->requestor, req->property, false, &multi_data,
                                           0, &multi_type, &multi_format)
            || multi_format != 32) {
            // MULTIPLE property not formatted correctly
            XSendEvent(screen()->display()->nativeDisplay(), req->requestor, False, NoEventMask, &event);
            return;
        }
        nmulti = multi_data.size()/sizeof(*multi);
        multi = new AtomPair[nmulti];
        memcpy(multi,multi_data.data(),multi_data.size());
        imulti = 0;
    }

    for (; imulti < nmulti; ++imulti) {
        Atom target;
        Atom property;

        if (multi) {
            target = multi[imulti].target;
            property = multi[imulti].property;
        } else {
            target = req->target;
            property = req->property;
            if (property == XNone) // obsolete client
                property = target;
        }

        Atom ret = XNone;
        if (target == XNone || property == XNone) {
            ;
        } else if (target == xa_timestamp) {
//            if (d->timestamp != CurrentTime) {
//                XChangeProperty(screen()->display()->nativeDisplay(), req->requestor, property, XA_INTEGER, 32,
//                                PropModeReplace, CurrentTime, 1);
//                ret = property;
//            } else {
//                qWarning("QClipboard: Invalid data timestamp");
//            }
        } else if (target == xa_targets) {
            ret = sendTargetsSelection(d, req->requestor, property);
        } else {
            ret = sendSelection(d, target, req->requestor, property);
        }

        if (nmulti > 0) {
            if (ret == XNone) {
                multi[imulti].property = XNone;
                multi_writeback = true;
            }
        } else {
            event.xselection.property = ret;
            break;
        }
    }

    if (nmulti > 0) {
        if (multi_writeback) {
            // according to ICCCM 2.6.2 says to put None back
            // into the original property on the requestor window
            XChangeProperty(screen()->display()->nativeDisplay(), req->requestor, req->property, multi_type, 32,
                            PropModeReplace, (uchar *) multi, nmulti * 2);
        }

        delete [] multi;
        event.xselection.property = req->property;
    }

    // send selection notify to requestor
    XSendEvent(screen()->display()->nativeDisplay(), req->requestor, False, NoEventMask, &event);
}

mimeData()

QMimeData * QXlibClipboard::mimeData ( QClipboard::Mode  mode )

virtual

Reimplemented from QPlatformClipboard.

Definition at line 164 of file qxlibclipboard.cpp.

{
    if (mode == QClipboard::Clipboard) {
        if (!m_xClipboard) {
            m_xClipboard = new QXlibClipboardMime(mode, this);
        }
        Window clipboardOwner = XGetSelectionOwner(screen()->display()->nativeDisplay(),QXlibStatic::atom(QXlibStatic::CLIPBOARD));
        if (clipboardOwner == owner()) {
            return m_clientClipboard;
        } else {
            return m_xClipboard;
        }
    } else if (mode == QClipboard::Selection) {
        if (!m_xSelection) {
            m_xSelection = new QXlibClipboardMime(mode, this);
        }
        Window clipboardOwner = XGetSelectionOwner(screen()->display()->nativeDisplay(),XA_PRIMARY);
        if (clipboardOwner == owner()) {
            return m_clientSelection;
        } else {
            return m_xSelection;
        }
    }
    return 0;
}

owner()

Window QXlibClipboard::owner

(

)

const

Definition at line 262 of file qxlibclipboard.cpp.

Referenced by mimeData(), and setMimeData().

{
    if (!m_owner) {
        int x = 0, y = 0, w = 3, h = 3;
        QXlibClipboard *that = const_cast<QXlibClipboard *>(this);
        Window window  = XCreateSimpleWindow(m_screen->display()->nativeDisplay(), m_screen->rootWindow(),
                                       x, y, w, h, 0 /*border_width*/,
                                       m_screen->blackPixel(), m_screen->whitePixel());
        that->setOwner(window);
    }
    return m_owner;
}

requestor()

Window QXlibClipboard::requestor

(

)

const

Definition at line 241 of file qxlibclipboard.cpp.

Referenced by getDataInFormat(), and handleSelectionRequest().

{
    if (!m_requestor) {
        int x = 0, y = 0, w = 3, h = 3;
        QXlibClipboard *that = const_cast<QXlibClipboard *>(this);
        Window window  = XCreateSimpleWindow(m_screen->display()->nativeDisplay(), m_screen->rootWindow(),
                                       x, y, w, h, 0 /*border_width*/,
                                       m_screen->blackPixel(), m_screen->whitePixel());
        that->setRequestor(window);
    }
    return m_requestor;
}

screen()

QXlibScreen * QXlibClipboard::screen

(

)

const

Definition at line 236 of file qxlibclipboard.cpp.

Referenced by clipboardReadIncrementalProperty(), clipboardReadProperty(), QXlibClipboardMime::empty(), QXlibClipboardMime::formats_sys(), getDataInFormat(), handleSelectionRequest(), mimeData(), sendSelection(), and sendTargetsSelection().

{
    return m_screen;
}

sendSelection()

Atom QXlibClipboard::sendSelection ( QMimeData *  d, Atom  target, Window  window, Atom  property  )

private

Definition at line 304 of file qxlibclipboard.cpp.

Referenced by handleSelectionRequest().

{
    Atom atomFormat = target;
    int dataFormat = 0;
    QByteArray data;

    QString fmt = QXlibMime::mimeAtomToString(screen()->display()->nativeDisplay(), target);
    if (fmt.isEmpty()) { // Not a MIME type we have
        qDebug() << "QClipboard: send_selection(): converting to type '%s' is not supported" << fmt.data();
        return XNone;
    }
    qDebug() << "QClipboard: send_selection(): converting to type '%s'" << fmt.data();

    if (QXlibMime::mimeDataForAtom(screen()->display()->nativeDisplay(),target, d, &data, &atomFormat, &dataFormat)) {

         // don't allow INCR transfers when using MULTIPLE or to
        // Motif clients (since Motif doesn't support INCR)
        static Atom motif_clip_temporary = QXlibStatic::atom(QXlibStatic::CLIP_TEMPORARY);
        bool allow_incr = property != motif_clip_temporary;

        // X_ChangeProperty protocol request is 24 bytes
        const int increment = (XMaxRequestSize(screen()->display()->nativeDisplay()) * 4) - 24;
        if (data.size() > increment && allow_incr) {
            long bytes = data.size();
            XChangeProperty(screen()->display()->nativeDisplay(), window, property,
                            QXlibStatic::atom(QXlibStatic::INCR), 32, PropModeReplace, (uchar *) &bytes, 1);

//            (void)new QClipboardINCRTransaction(window, property, atomFormat, dataFormat, data, increment);
            qDebug() << "not implemented INCRT just YET!";
            return property;
        }

        // make sure we can perform the XChangeProperty in a single request
        if (data.size() > increment)
            return XNone; // ### perhaps use several XChangeProperty calls w/ PropModeAppend?
        int dataSize = data.size() / (dataFormat / 8);
        // use a single request to transfer data
        XChangeProperty(screen()->display()->nativeDisplay(), window, property, atomFormat,
                        dataFormat, PropModeReplace, (uchar *) data.data(),
                        dataSize);
    }
    return property;
}

sendTargetsSelection()

Atom QXlibClipboard::sendTargetsSelection ( QMimeData *  d, Window  window, Atom  property  )

private

Definition at line 283 of file qxlibclipboard.cpp.

Referenced by handleSelectionRequest().

{
    QVector<Atom> types;
    QStringList formats = QInternalMimeData::formatsHelper(d);
    for (int i = 0; i < formats.size(); ++i) {
        QList<Atom> atoms = QXlibMime::mimeAtomsForFormat(screen()->display()->nativeDisplay(),formats.at(i));
        for (int j = 0; j < atoms.size(); ++j) {
            if (!types.contains(atoms.at(j)))
                types.append(atoms.at(j));
        }
    }
    types.append(QXlibStatic::atom(QXlibStatic::TARGETS));
    types.append(QXlibStatic::atom(QXlibStatic::MULTIPLE));
    types.append(QXlibStatic::atom(QXlibStatic::TIMESTAMP));
    types.append(QXlibStatic::atom(QXlibStatic::SAVE_TARGETS));

    XChangeProperty(screen()->display()->nativeDisplay(), window, property, XA_ATOM, 32,
                    PropModeReplace, (uchar *) types.data(), types.size());
    return property;
}

setMimeData()

void QXlibClipboard::setMimeData ( QMimeData *  data, QClipboard::Mode  mode  )

virtual

Reimplemented from QPlatformClipboard.

Definition at line 190 of file qxlibclipboard.cpp.

{
    Atom modeAtom;
    QMimeData **d;
    switch (mode) {
    case QClipboard::Selection:
        modeAtom = XA_PRIMARY;
        d = &m_clientSelection;
        break;

    case QClipboard::Clipboard:
        modeAtom = QXlibStatic::atom(QXlibStatic::CLIPBOARD);
        d = &m_clientClipboard;
        break;

    default:
        qWarning("QClipboard::setMimeData: unsupported mode '%d'", mode);
        return;
    }

    Window newOwner;

    if (! data) { // no data, clear clipboard contents
        newOwner = XNone;
    } else {
        newOwner = owner();

        *d = data;
    }

    XSetSelectionOwner(m_screen->display()->nativeDisplay(), modeAtom, newOwner, CurrentTime);

    if (XGetSelectionOwner(m_screen->display()->nativeDisplay(), modeAtom) != newOwner) {
        qWarning("QClipboard::setData: Cannot set X11 selection owner");
    }

}

setOwner()

void QXlibClipboard::setOwner ( Window  window )

private

Definition at line 275 of file qxlibclipboard.cpp.

Referenced by owner().

{
    if (m_owner != XNone){
        XDestroyWindow(m_screen->display()->nativeDisplay(),m_owner);
    }
    m_owner = window;
}

setRequestor()

void QXlibClipboard::setRequestor

(

Window

window

)

Definition at line 254 of file qxlibclipboard.cpp.

Referenced by clipboardReadIncrementalProperty(), and requestor().

{
    if (m_requestor != XNone) {
        XDestroyWindow(m_screen->display()->nativeDisplay(),m_requestor);
    }
    m_requestor = window;
}

supportsMode()

bool QXlibClipboard::supportsMode ( QClipboard::Mode  mode ) const

virtual

Reimplemented from QPlatformClipboard.

Definition at line 228 of file qxlibclipboard.cpp.

{
    if (mode == QClipboard::Clipboard || mode == QClipboard::Selection)
        return true;
    return false;
}

Properties

clipboard_timeout

const int QXlibClipboard::clipboard_timeout = 5000

staticprivate

Definition at line 90 of file qxlibclipboard.h.

Referenced by clipboardReadIncrementalProperty(), and getDataInFormat().

m_clientClipboard

QMimeData* QXlibClipboard::m_clientClipboard

private

Definition at line 82 of file qxlibclipboard.h.

Referenced by handleSelectionRequest(), mimeData(), and setMimeData().

m_clientSelection

QMimeData* QXlibClipboard::m_clientSelection

private

Definition at line 85 of file qxlibclipboard.h.

Referenced by handleSelectionRequest(), mimeData(), and setMimeData().

m_owner

Window QXlibClipboard::m_owner

private

Definition at line 88 of file qxlibclipboard.h.

Referenced by owner(), and setOwner().

m_requestor

Window QXlibClipboard::m_requestor

private

Definition at line 87 of file qxlibclipboard.h.

Referenced by requestor(), and setRequestor().

m_screen

QXlibScreen* QXlibClipboard::m_screen

private

Definition at line 79 of file qxlibclipboard.h.

Referenced by owner(), requestor(), screen(), setMimeData(), setOwner(), and setRequestor().

m_xClipboard

QMimeData* QXlibClipboard::m_xClipboard

private

Definition at line 81 of file qxlibclipboard.h.

Referenced by mimeData().

m_xSelection

QMimeData* QXlibClipboard::m_xSelection

private

Definition at line 84 of file qxlibclipboard.h.

Referenced by mimeData().

---

The documentation for this class was generated from the following files:

• /src/plugins/platforms/xlib/qxlibclipboard.h
• /src/plugins/platforms/xlib/qxlibclipboard.cpp