qclipboard_x11.cpp

奇趣公司比较新的qt/emd版本

            usleep_tv.tv_sec = 0;
            usleep_tv.tv_usec = 50000;
            select(0, 0, 0, 0, &usleep_tv);
        } while (started.msecsTo(now) < timeout);
    }
    return false;
}


static inline int maxSelectionIncr(Display *dpy)
{ return XMaxRequestSize(dpy) > 65536 ? 65536*4 : XMaxRequestSize(dpy)*4 - 100; }

bool QX11Data::clipboardReadProperty(Window win, Atom property, bool deleteProperty,
                                     QByteArray *buffer, int *size, Atom *type, int *format, bool nullterm)
{
    int           maxsize = maxSelectionIncr(display);
    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(display, 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;

    VDEBUG("QClipboard: read_property(): initial property length: %d", proplen);

    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 + (nullterm ? 1 : 0);
    buffer->resize(newSize);

    bool ok = (buffer->size() == newSize);
    VDEBUG("QClipboard: read_property(): buffer resized to %d", buffer->size());

    if (ok) {
        // could allocate buffer

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

            r = XGetWindowProperty(display, 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 == ATOM(COMPOUND_TEXT)) {
            // convert COMPOUND_TEXT to a multibyte string
            XTextProperty textprop;
            textprop.encoding = *type;
            textprop.format = *format;
            textprop.nitems = length;
            textprop.value = (unsigned char *) buffer->data();

            char **list_ret = 0;
            int count;
            if (XmbTextPropertyToTextList(display, &textprop, &list_ret,
                         &count) == Success && count && list_ret) {
                offset = strlen(list_ret[0]);
                buffer->resize(offset + (nullterm ? 1 : 0));
                memcpy(buffer->data(), list_ret[0], offset);
            }
            if (list_ret) XFreeStringList(list_ret);
        }

        // zero-terminate (for text)
        if (nullterm)
            buffer->data()[buffer_offset] = '\0';
    }

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

    VDEBUG("QClipboard: read_property(): buffer size %d, buffer offset %d, offset %d",
           buffer->size(), buffer_offset, offset);

    if (deleteProperty)
        XDeleteProperty(display, win, property);

    XFlush(display);

    return ok;
}

QByteArray QX11Data::clipboardReadIncrementalProperty(Window win, Atom property, int nbytes, bool nullterm)
{
    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 (;;) {
        XFlush(display);
        if (!clipboardWaitForEvent(win,PropertyNotify,&event,clipboard_timeout))
            break;
        if (event.xproperty.atom != property ||
             event.xproperty.state != PropertyNewValue)
            continue;
        if (X11->clipboardReadProperty(win, property, true, &tmp_buf, &length, 0, 0, false)) {
            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
    delete requestor;
    requestor = new QWidget(0);
    requestor->setObjectName(QLatin1String("internal clipboard requestor"));

    return QByteArray();
}

static Atom send_targets_selection(QClipboardData *d, Window window, Atom property)
{
    QVector<Atom> types;
    QStringList formats = QInternalMimeData::formatsHelper(d->source());
    for (int i = 0; i < formats.size(); ++i) {
        QList<Atom> atoms = X11->xdndMimeAtomsForFormat(formats.at(i));
        for (int j = 0; j < atoms.size(); ++j) {
            if (!types.contains(atoms.at(j)))
                types.append(atoms.at(j));
        }
    }
    types.append(ATOM(TARGETS));
    types.append(ATOM(MULTIPLE));
    types.append(ATOM(TIMESTAMP));

    XChangeProperty(X11->display, window, property, XA_ATOM, 32,
                    PropModeReplace, (uchar *) types.data(), types.size());
    return property;
}

static Atom send_selection(QClipboardData *d, Atom target, Window window, Atom property)
{
    Atom atomFormat = target;
    int dataFormat = 0;
    QByteArray data;
    if (X11->xdndMimeDataForAtom(target, d->source(), &data, &atomFormat, &dataFormat)) {

        VDEBUG("QClipboard: send_selection():\n"
          "    property type %lx\n"
          "    property name '%s'\n"
          "    format %d\n"
          "    %d bytes\n",
          target, X11->xdndMimeAtomToString(atomFormat).toLatin1().data(), dataFormat, data.size());

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

        // X_ChangeProperty protocol request is 24 bytes
        const int increment = (XMaxRequestSize(X11->display) * 4) - 24;
        if (data.size() > increment && allow_incr) {
            long bytes = data.size();
            XChangeProperty(X11->display, window, property,
                            ATOM(INCR), 32, PropModeReplace, (uchar *) &bytes, 1);

            (void)new QClipboardINCRTransaction(window, property, atomFormat, dataFormat, data, increment);
            return ATOM(INCR);
        }

        // 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(X11->display, window, property, atomFormat,
                        dataFormat, PropModeReplace, (uchar *) data.data(),
                        dataSize);
    }
    return property;
}

/*! \internal
    Internal cleanup for Windows.
*/
void QClipboard::ownerDestroyed()
{ }


/*! \internal
    Internal optimization for Windows.
*/
void QClipboard::connectNotify(const char *)
{ }


/*! \reimp
 */
bool QClipboard::event(QEvent *e)
{
    if (e->type() == QEvent::Timer) {
        QTimerEvent *te = (QTimerEvent *) e;

        if (waiting_for_data) // should never happen
            return false;

        if (te->timerId() == timer_id) {
            killTimer(timer_id);
            timer_id = 0;

            timer_event_clear = true;
            if (selection_watcher) // clear selection
                selectionData()->clear();
            if (clipboard_watcher) // clear clipboard
                clipboardData()->clear();
            timer_event_clear = false;

            return true;
        } else if (te->timerId() == pending_timer_id) {
            // I hate klipper
            killTimer(pending_timer_id);
            pending_timer_id = 0;

            if (pending_clipboard_changed) {
                pending_clipboard_changed = false;
                clipboardData()->clear();
                emitChanged(QClipboard::Clipboard);
            }
            if (pending_selection_changed) {
                pending_selection_changed = false;
                selectionData()->clear();
                emitChanged(QClipboard::Selection);
            }

            return true;
        } else if (te->timerId() == incr_timer_id) {
            killTimer(incr_timer_id);
            incr_timer_id = 0;

            qt_xclb_incr_timeout();

            return true;
        } else {
            return QObject::event(e);
        }
    } else if (e->type() != QEvent::Clipboard) {
        return QObject::event(e);
    }

    XEvent *xevent = (XEvent *)(((QClipboardEvent *)e)->data());
    Display *dpy = X11->display;

    if (!xevent)
        return true;

    switch (xevent->type) {

    case SelectionClear:
        // new selection owner
        if (xevent->xselectionclear.selection == XA_PRIMARY) {
            QClipboardData *d = selectionData();

            // ignore the event if it was generated before we gained selection ownership
            if (d->timestamp != CurrentTime && xevent->xselectionclear.time < d->timestamp)
                break;

            DEBUG("QClipboard: new selection owner 0x%lx at time %lx (ours %lx)",
                  XGetSelectionOwner(dpy, XA_PRIMARY),
                  xevent->xselectionclear.time, d->timestamp);

            if (! waiting_for_data) {
                d->clear();
                emitChanged(QClipboard::Selection);
            } else {
                pending_selection_changed = true;
                if (! pending_timer_id)
                    pending_timer_id = QApplication::clipboard()->startTimer(0);
            }
        } else if (xevent->xselectionclear.selection == ATOM(CLIPBOARD)) {
            QClipboardData *d = clipboardData();

            // ignore the event if it was generated before we gained selection ownership
            if (d->timestamp != CurrentTime && xevent->xselectionclear.time < d->timestamp)
                break;

            DEBUG("QClipboard: new clipboard owner 0x%lx at time %lx (%lx)",
                  XGetSelectionOwner(dpy, ATOM(CLIPBOARD)),
                  xevent->xselectionclear.time, d->timestamp);

            if (! waiting_for_data) {
                d->clear();
                emitChanged(QClipboard::Clipboard);
            } else {
                pending_clipboard_changed = true;
                if (! pending_timer_id)
                    pending_timer_id = QApplication::clipboard()->startTimer(0);
            }
        } else {
            qWarning("QClipboard: Unknown SelectionClear event received");
            return false;
        }
        break;

    case SelectionNotify:
        /*
          Something has delivered data to us, but this was not caught
          by QClipboardWatcher::getDataInFormat()

          Just skip the event to prevent Bad Things (tm) from
          happening later on...
        */
        break;

    case SelectionRequest:
        {
            // someone wants our data
            XSelectionRequestEvent *req = &xevent->xselectionrequest;

            if (requestor && req->requestor == requestor->internalWinId())
                break;

            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;

            DEBUG("QClipboard: SelectionRequest from %lx\n"
                  "    selection 0x%lx (%s) target 0x%lx (%s)",
                  req->requestor,
                  req->selection,
                  X11->xdndAtomToString(req->selection).data(),
                  req->target,
                  X11->xdndAtomToString(req->target).data());

            QClipboardData *d;
            if (req->selection == XA_PRIMARY) {
                d = selectionData();
            } else if (req->selection == ATOM(CLIPBOARD)) {
                d = clipboardData();
            } else {
                qWarning("QClipboard: Unknown selection '%lx'", req->selection);
                XSendEvent(dpy, req->requestor, False, NoEventMask, &event);
                break;
            }

            if (! d->source()) {
                qWarning("QClipboard: Cannot transfer data, no data available");
                XSendEvent(dpy, req->requestor, False, NoEventMask, &event);
                break;
            }

            DEBUG("QClipboard: SelectionRequest at time %lx (ours %lx)",
                  req->time, d->timestamp);

            if (d->timestamp == CurrentTime // we don't own the selection anymore
                || (req->time != CurrentTime && req->time < d->timestamp)) {
                DEBUG("QClipboard: SelectionRequest too old");
                XSendEvent(dpy, req->requestor, False, NoEventMask, &event);
                break;
            }

            Atom xa_targets = ATOM(TARGETS);
            Atom xa_multiple = ATOM(MULTIPLE);
            Atom xa_timestamp = ATOM(TIMESTAMP);

            struct AtomPair { Atom target; Atom property; } *multi = 0;
            Atom multi_type = XNone;
            int multi_format = 0;
            int nmulti = 0;