qmotifdnd_x11.cpp

奇趣公司比较新的qt/emd版本

    XFree((char*)targets_table);

    return tmp; // targets_table->entries[index].num_targets;
}


QByteArray QX11Data::motifdndFormat(int n)
{
    if (!motifdnd_active)
        return 0; // should not happen

    if (n >= num_src_targets)
        return 0;

    Atom target = src_targets[n];

    if (target == XA_STRING)
        return "text/plain;charset=ISO-8859-1";
    if (target == ATOM(UTF8_STRING))
        return "text/plain;charset=UTF-8";
    if (target == ATOM(COMPOUND_TEXT))
        return QByteArray("text/plain;charset=") + QTextCodec::codecForLocale()->name();
    if (target == ATOM(TEXT))
        return "text/plain";

    return ("x-motif-dnd/" + X11->xdndAtomToString(target));
}


QVariant QX11Data::motifdndObtainData(const char *mimeType)
{
    QByteArray result;

    if (Dnd_selection == 0 || !dropWidget)
        return result;

    // try to convert the selection to the requested property
    // qDebug("trying to convert to '%s'", mimeType);

    int n=0;
    QByteArray f;
    do {
        f = motifdndFormat(n);
        if (f.isEmpty())
            return result;
        n++;
    } while(qstricmp(mimeType, f.data()));

    Atom conversion_type = XNone;
    if (f == "text/plain;charset=ISO-8859-1") {
        conversion_type = XA_STRING;
    } else if (f == "text/plain;charset=UTF-8") {
        conversion_type = ATOM(UTF8_STRING);
    } else if (f == (QByteArray("text/plain;charset=") + QTextCodec::codecForLocale()->name())) {
        conversion_type = ATOM(COMPOUND_TEXT);
    } else if (f == "text/plain") {
        conversion_type = ATOM(TEXT);
    } else if (f.startsWith("x-motif-dnd/")) {
        // strip off the "x-motif-dnd/" prefix
        conversion_type = X11->xdndStringToAtom(f.remove(0, 12));
    }

    if (XGetSelectionOwner(X11->display, Dnd_selection) == XNone) {
        return result; // should never happen?
    }

    QWidget* tw = dropWidget;
    if ((dropWidget->windowType() == Qt::Desktop)) {
        tw = new QWidget;
    }

    // convert selection to the appropriate type
    XConvertSelection (X11->display, Dnd_selection, conversion_type,
                       Dnd_selection, tw->internalWinId(), Dnd_selection_time);

    XFlush(X11->display);

    XEvent xevent;
    bool got=X11->clipboardWaitForEvent(tw->internalWinId(), SelectionNotify, &xevent, 5000);
    if (got) {
        Atom type;

        if (X11->clipboardReadProperty(tw->internalWinId(), Dnd_selection, true, &result, 0, &type, 0, false)) {
        }
    }

    //   we have to convert selection in order to indicate success to the initiator
    XConvertSelection (X11->display, Dnd_selection, ATOM(XmTRANSFER_SUCCESS),
                       Dnd_selection, tw->internalWinId(), Dnd_selection_time);

    // wait again for SelectionNotify event
    X11->clipboardWaitForEvent(tw->internalWinId(), SelectionNotify, &xevent, 5000);

    if ((dropWidget->windowType() == Qt::Desktop)) {
        delete tw;
    }

    return result;
}


void QX11Data::motifdndEnable(QWidget *widget, bool)
{
    DndWriteReceiverProperty(display, widget->internalWinId(), DND_DRAG_DYNAMIC);
}


void QX11Data::motifdndHandle(QWidget *widget, const XEvent * xe, bool /* passive */)
{
    XEvent event = *xe;
    XClientMessageEvent cm ;
    DndData dnd_data ;
    char receiver ;

    if (!(DndParseClientMessage ((XClientMessageEvent*)&event,
                                 &dnd_data, &receiver))) {
        return;
    }

    switch (dnd_data.reason) {

    case DND_DRAG_MOTION:
        {
            QPoint p = widget->mapFromGlobal(QPoint(dnd_data.x, dnd_data.y));
            QWidget *c = widget->childAt(p);

            if (!c || !c->acceptDrops()) {
                // not over a drop site
                if (dropWidget) {
                    QDragLeaveEvent dragLeaveEvent;
                    QApplication::sendEvent(dropWidget, &dragLeaveEvent);

                    dropWidget = 0;
                    lastAcceptedAction = Qt::IgnoreAction;

                    dnd_data.reason = DND_DROP_SITE_LEAVE;
                    dnd_data.time = X11->time;
                    DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, receiver);
                    XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm) ;
                } else {
                    dnd_data.reason = DND_DRAG_MOTION;
                    dnd_data.status = DND_NO_DROP_SITE;
                    dnd_data.time = X11->time;
                    dnd_data.operation = DND_NOOP;
                    dnd_data.operations = DND_NOOP;
                    DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, receiver);
                    XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm) ;
                }
            } else {
                Q_ASSERT(c != 0);
                p = c->mapFrom(widget, p);

                if (dropWidget != c) {
                    if (dropWidget) {
                        QDragLeaveEvent le;
                        QApplication::sendEvent(dropWidget, &le);
                    }

                    dropWidget = c;
                    lastAcceptedAction = Qt::IgnoreAction;

                    const Qt::DropActions possibleActions =
                        DndOperationsToQtDropActions(dnd_data.operations);
                    QDragEnterEvent de(p, possibleActions, QDragManager::self()->dropData,
                                       QApplication::mouseButtons(), QApplication::keyboardModifiers());
                    QApplication::sendEvent(dropWidget, &de);

                    dnd_data.reason = DND_DROP_SITE_ENTER;
                    dnd_data.time = X11->time;
                    if (de.isAccepted()) {
                        lastAcceptedAction = de.dropAction();

                        dnd_data.status = DND_VALID_DROP_SITE;
                        dnd_data.operation = QtDropActionToDndOperation(lastAcceptedAction);
                    } else {
                        dnd_data.status = DND_INVALID_DROP_SITE;
                        dnd_data.operation = DND_NOOP;
                        dnd_data.operations = DND_NOOP;
                    }
                    DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, receiver);
                    XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm);
                } else {
                    const Qt::DropActions possibleActions =
                        DndOperationsToQtDropActions(dnd_data.operations);
                    QDragMoveEvent me(p, possibleActions, QDragManager::self()->dropData,
                                      QApplication::mouseButtons(), QApplication::keyboardModifiers());
                    if (lastAcceptedAction != Qt::IgnoreAction) {
                        me.setDropAction(lastAcceptedAction);
                        me.accept();
                    }
                    QApplication::sendEvent(dropWidget, &me);

                    dnd_data.reason = DND_DRAG_MOTION;
                    dnd_data.time = X11->time;

                    if (me.isAccepted()) {
                        lastAcceptedAction = me.dropAction();

                        dnd_data.status = DND_VALID_DROP_SITE;
                        dnd_data.operation = QtDropActionToDndOperation(lastAcceptedAction);
                    } else {
                        dnd_data.status = DND_INVALID_DROP_SITE;
                        dnd_data.operation = DND_NOOP;
                        dnd_data.operations = DND_NOOP;
                    }

                    DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, receiver);
                    XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm);
                }
            }

            break;
        }

    case DND_TOP_LEVEL_ENTER:
        {
            /* get the size of our drop site for later use */

            motifdnd_active = true;
            sourceWindow = dnd_data.src_window;

            /* no answer needed, just read source property */
            DndReadSourceProperty (event.xclient.display,
                                   sourceWindow,
                                   dnd_data.property,
                                   &src_targets, &num_src_targets);

            break;
        }

    case DND_TOP_LEVEL_LEAVE:
        {
            XEvent nextEvent;
            if (XCheckTypedWindowEvent(X11->display, widget->winId(), ClientMessage, &nextEvent)) {
                // we just want to check, not eat (should use XPeekIfEvent)
                XPutBackEvent(X11->display, &nextEvent);

                if (DndParseClientMessage (&nextEvent.xclient, &dnd_data, &receiver)
                    && dnd_data.reason == DND_DROP_START) {
                    // expecting drop next, keeping DnD alive
                    break;
                }
            }

            // not expecting drop, need to send drag leave events and such here
            if (dropWidget) {
                QDragLeaveEvent le;
                QApplication::sendEvent(dropWidget, &le);
            }

            sourceWindow = XNone;
            dropWidget = 0;
            lastAcceptedAction = Qt::IgnoreAction;

            motifdnd_active = false;

            break;
        }

    case DND_OPERATION_CHANGED:
        // ### need to echo
        break;

    case DND_DROP_START:
        {
            Q_ASSERT(motifdnd_active);
            Q_ASSERT(sourceWindow == dnd_data.src_window);

            if (!dropWidget || lastAcceptedAction == Qt::IgnoreAction) {
                // echo DROP_START
                dnd_data.reason = DND_DROP_START;
                dnd_data.status = DND_NO_DROP_SITE;
                dnd_data.operation = DND_NOOP;
                dnd_data.operations = DND_NOOP;
                DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, 0);
                XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm);

                // we have to convert selection in order to indicate failure to the initiator
                XConvertSelection (X11->display, dnd_data.property, ATOM(XmTRANSFER_FAILURE),
                                   dnd_data.property, dnd_data.src_window, dnd_data.time);

                if (dropWidget) {
                    QDragLeaveEvent e;
                    QApplication::sendEvent(dropWidget, &e);
                }

                motifdnd_active = false;
                sourceWindow = XNone;
                dropWidget = 0;
                lastAcceptedAction = Qt::IgnoreAction;

                return;
            }

            // store selection and its time
            Dnd_selection = dnd_data.property;
            Dnd_selection_time = dnd_data.time;

            QPoint p(dnd_data.x, dnd_data.y);
            QDropEvent de(dropWidget->mapFromGlobal(p), Qt::CopyAction, QDragManager::self()->dropData,
                          QApplication::mouseButtons(), QApplication::keyboardModifiers());
            if (lastAcceptedAction != Qt::IgnoreAction) {
                de.setDropAction(lastAcceptedAction);
                de.accept();
            }
            QApplication::sendEvent(dropWidget, &de);

            // reset
            Dnd_selection = XNone;
            Dnd_selection_time = 0;

            // echo DROP_START depending on the result of the dropEvent
            if (de.isAccepted()) {
                dnd_data.reason = DND_DROP_START;
                dnd_data.status = DND_VALID_DROP_SITE;
                dnd_data.operation = QtDropActionToDndOperation(de.dropAction());
            } else {
                dnd_data.reason = DND_DROP_START;
                dnd_data.status = DND_NO_DROP_SITE;
                dnd_data.operation = DND_NOOP;
                dnd_data.operations = DND_NOOP;
            }
            DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, 0);
            XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm);

            sourceWindow = XNone;
            dropWidget = 0;
            lastAcceptedAction = Qt::IgnoreAction;

            motifdnd_active = false;

            break;
        }

    default:
        break;
    }   //  end of switch (dnd_data.reason)
}

#endif // QT_NO_DRAGANDDROP