qkeymapper_x11.cpp

奇趣公司比较新的qt/emd版本

        // convert chars (8bit) to text (unicode).
        if (mapper)
            text = mapper->toUnicode(chars.data(), count, 0);
        if (text.isEmpty()) {
            // no mapper, or codec couldn't convert to unicode (this
            // can happen when running in the C locale or with no LANG
            // set). try converting from latin-1
            text = QString::fromLatin1(chars);
        }
    }

    modifiers = X11->translateModifiers(xmodifiers);

    // Commentary in X11/keysymdef says that X codes match ASCII, so it
    // is safe to use the locale functions to process X codes in ISO8859-1.
    //
    // This is mainly for compatibility - applications should not use the
    // Qt keycodes between 128 and 255, but should rather use the
    // QKeyEvent::text().
    //
    extern QTextCodec *qt_input_mapper; // from qapplication_x11.cpp
    if (keysym < 128 || (keysym < 256 && (!qt_input_mapper || qt_input_mapper->mibEnum()==4))) {
        // upper-case key, if known
        code = isprint((int)keysym) ? toupper((int)keysym) : 0;
    } else if (keysym >= XK_F1 && keysym <= XK_F35) {
        // function keys
        code = Qt::Key_F1 + ((int)keysym - XK_F1);
    } else if (keysym >= XK_KP_Space && keysym <= XK_KP_9) {
        if (keysym >= XK_KP_0) {
            // numeric keypad keys
            code = Qt::Key_0 + ((int)keysym - XK_KP_0);
        } else {
            code = translateKeySym(keysym);
        }
        modifiers |= Qt::KeypadModifier;
    } else if (text.length() == 1 && text.unicode()->unicode() > 0x1f && text.unicode()->unicode() != 0x7f && !(keysym >= XK_dead_grave && keysym <= XK_dead_horn)) {
        code = text.unicode()->toUpper().unicode();
    } else {
        // any other keys
        code = translateKeySym(keysym);

        if (code == Qt::Key_Tab && (modifiers & Qt::ShiftModifier)) {
            // map shift+tab to shift+backtab, QShortcutMap knows about it
            // and will handle it.
            code = Qt::Key_Backtab;
            text = QString();
        }
    }

    return text;
}

bool QKeyMapperPrivate::translateKeyEventInternal(QWidget *keyWidget,
                                                  const XEvent *event,
                                                  KeySym &keysym,
                                                  int& count,
                                                  QString& text,
                                                  Qt::KeyboardModifiers &modifiers,
                                                  int& code,
                                                  QEvent::Type &type,
                                                  bool statefulTranslation)
{
    XKeyEvent xkeyevent = event->xkey;
    int keycode = event->xkey.keycode;
    // save the modifier state, we will use the keystate uint later by passing
    // it to translateButtonState
    uint keystate = event->xkey.state;

    type = (event->type == XKeyPress) ? QEvent::KeyPress : QEvent::KeyRelease;

    static int directionKeyEvent = 0;
    static unsigned int lastWinId = 0;
    extern bool qt_use_rtl_extensions; // from qapplication_x11.cpp

    // translate pending direction change
    if (statefulTranslation && qt_use_rtl_extensions && type == QEvent::KeyRelease) {
        if (directionKeyEvent == Qt::Key_Direction_R || directionKeyEvent == Qt::Key_Direction_L) {
            type = QEvent::KeyPress;
            code = directionKeyEvent;
            text = QString();
            directionKeyEvent = 0;
	    lastWinId = 0;
            return true;
        } else {
            directionKeyEvent = 0;
	    lastWinId = 0;
        }
    }

    // some XmbLookupString implementations don't return buffer overflow correctly,
    // so we increase the input buffer to allow for long strings...
    // 256 chars * 2 bytes + 1 null-term == 513 bytes
    QByteArray chars;
    chars.resize(513);

    count = XLookupString(&xkeyevent, chars.data(), chars.size(), &keysym, 0);
    if (count && !keycode) {
        extern int qt_ximComposingKeycode; // from qapplication_x11.cpp
        keycode = qt_ximComposingKeycode;
        qt_ximComposingKeycode = 0;
    }

    // translate the keysym + xmodifiers to Qt::Key_* + Qt::KeyboardModifiers
    text = translateKeySym(keysym, keystate, code, modifiers, chars, count);

    // Watch for keypresses and if its a key belonging to the Ctrl-Shift
    // direction-changing accel, remember it.
    // We keep track of those keys instead of using the event's state
    // (to figure out whether the Ctrl modifier is held while Shift is pressed,
    // or Shift is held while Ctrl is pressed) since the 'state' doesn't tell
    // us whether the modifier held is Left or Right.
    if (statefulTranslation && qt_use_rtl_extensions && type == QEvent::KeyPress) {
        if (keysym == XK_Control_L || keysym == XK_Control_R
            || keysym == XK_Shift_L || keysym == XK_Shift_R) {
	    if (!directionKeyEvent) {
		directionKeyEvent = keysym;
		// This code exists in order to check that
		// the event is occurred in the same widget.
		lastWinId = keyWidget->internalWinId();
	    }
        } else {
            // this can no longer be a direction-changing accel.
            // if any other key was pressed.
            directionKeyEvent = Qt::Key_Space;
        }

        if (directionKeyEvent && lastWinId == keyWidget->internalWinId()) {
            if (keysym == XK_Shift_L && directionKeyEvent == XK_Control_L ||
                keysym == XK_Control_L && directionKeyEvent == XK_Shift_L) {
                directionKeyEvent = Qt::Key_Direction_L;
            } else if (keysym == XK_Shift_R && directionKeyEvent == XK_Control_R ||
                       keysym == XK_Control_R && directionKeyEvent == XK_Shift_R) {
                directionKeyEvent = Qt::Key_Direction_R;
            }
        } else if (directionKeyEvent == Qt::Key_Direction_L
                   || directionKeyEvent == Qt::Key_Direction_R) {
            directionKeyEvent = Qt::Key_Space; // invalid
        }
    }

    return true;
}


struct qt_auto_repeat_data
{
    // match the window and keycode with timestamp delta of 10 ms
    Window window;
    KeyCode keycode;
    Time timestamp;

    // queue scanner state
    bool release;
    bool error;
};

#if defined(Q_C_CALLBACKS)
extern "C" {
#endif

static Bool qt_keypress_scanner(Display *, XEvent *event, XPointer arg)
{
    if (event->type != XKeyPress && event->type != XKeyRelease)
        return false;

    qt_auto_repeat_data *data = (qt_auto_repeat_data *) arg;
    if (data->error ||
        event->xkey.window  != data->window ||
        event->xkey.keycode != data->keycode)
        return false;

    if (event->type == XKeyPress) {
        data->error = (! data->release || event->xkey.time - data->timestamp > 10);
        return (! data->error);
    }

    // must be XKeyRelease event
    if (data->release) {
        // found a second release
        data->error = true;
        return false;
    }

    // found a single release
    data->release = true;
    data->timestamp = event->xkey.time;

    return false;
}

static Bool qt_keyrelease_scanner(Display *, XEvent *event, XPointer arg)
{
    const qt_auto_repeat_data *data = (const qt_auto_repeat_data *) arg;
    return (event->type == XKeyRelease &&
            event->xkey.window  == data->window &&
            event->xkey.keycode == data->keycode);
}

#if defined(Q_C_CALLBACKS)
}
#endif

bool QKeyMapperPrivate::translateKeyEvent(QWidget *keyWidget, const XEvent *event, bool grab)
{
    int           code = -1;
    int           count = 0;
    Qt::KeyboardModifiers modifiers;

    if (qt_sm_blockUserInput) // block user interaction during session management
        return true;

    Display *dpy = X11->display;

    if (!keyWidget->isEnabled())
        return true;

    QEvent::Type type;
    bool    autor = false;
    QString text;

    KeySym keysym = 0;
    translateKeyEventInternal(keyWidget, event, keysym, count, text, modifiers, code, type);

    // was this the last auto-repeater?
    qt_auto_repeat_data auto_repeat_data;
    auto_repeat_data.window = event->xkey.window;
    auto_repeat_data.keycode = event->xkey.keycode;
    auto_repeat_data.timestamp = event->xkey.time;

    static uint curr_autorep = 0;
    if (event->type == XKeyPress) {
        if (curr_autorep == event->xkey.keycode) {
            autor = true;
            curr_autorep = 0;
        }
    } else {
        // look ahead for auto-repeat
        XEvent nextpress;

        auto_repeat_data.release = true;
        auto_repeat_data.error = false;
        if (XCheckIfEvent(dpy, &nextpress, &qt_keypress_scanner,
                          (XPointer) &auto_repeat_data)) {
            autor = true;

            // Put it back... we COULD send the event now and not need
            // the static curr_autorep variable.
            XPutBackEvent(dpy,&nextpress);
        }
        curr_autorep = autor ? event->xkey.keycode : 0;
    }

#if defined QT3_SUPPORT && !defined(QT_NO_SHORTCUT)
    // process accelerators before doing key compression
    if (type == QEvent::KeyPress && !grab
        && QApplicationPrivate::instance()->use_compat()) {
        // send accel events if the keyboard is not grabbed
        QKeyEventEx a(type, code, modifiers, text, autor, qMax(qMax(count,1), int(text.length())),
                      event->xkey.keycode, keysym, event->xkey.state);
        if (QApplicationPrivate::instance()->qt_tryAccelEvent(keyWidget, &a))
            return true;
    }
#endif

#ifndef QT_NO_IM
    QInputContext *qic = keyWidget->inputContext();
#endif

    // compress keys
    if (!text.isEmpty() && keyWidget->testAttribute(Qt::WA_KeyCompression) &&
#ifndef QT_NO_IM
        // Ordinary input methods require discrete key events to work
        // properly, so key compression has to be disabled when input
        // context exists.
        //
        // And further consideration, some complex input method
        // require all key press/release events discretely even if
        // the input method awares of key compression and compressed
        // keys are ordinary alphabets. For example, the uim project
        // is planning to implement "combinational shift" feature for
        // a Japanese input method, uim-skk. It will work as follows.
        //
        // 1. press "r"
        // 2. press "u"
        // 3. release both "r" and "u" in arbitrary order
        // 4. above key sequence generates "Ru"
        //
        // Of course further consideration about other participants
        // such as key repeat mechanism is required to implement such
        // feature.
        !qic &&
#endif // QT_NO_IM
        // do not compress keys if the key event we just got above matches
        // one of the key ranges used to compute stopCompression
        !((code >= Qt::Key_Escape && code <= Qt::Key_SysReq)
          || (code >= Qt::Key_Home && code <= Qt::Key_PageDown)
          || (code >= Qt::Key_Super_L && code <= Qt::Key_Direction_R)
          || (code == 0)
          || (text.length() == 1 && text.unicode()->unicode() == '\n'))) {
        // the widget wants key compression so it gets it

        // sync the event queue, this makes key compress work better
        XSync(dpy, false);

        for (;;) {
            XEvent        evRelease;
            XEvent        evPress;
            if (!XCheckTypedWindowEvent(dpy,event->xkey.window,
                                        XKeyRelease,&evRelease))
                break;
            if (!XCheckTypedWindowEvent(dpy,event->xkey.window,
                                        XKeyPress,&evPress)) {
                XPutBackEvent(dpy, &evRelease);
                break;
            }
            QString textIntern;
            int codeIntern = -1;
            int countIntern = 0;
            Qt::KeyboardModifiers modifiersIntern;
            QEvent::Type t;
            KeySym keySymIntern;
            translateKeyEventInternal(keyWidget, &evPress, keySymIntern, countIntern, textIntern,
                                      modifiersIntern, codeIntern, t);
            // use stopCompression to stop key compression for the following
            // key event ranges:
            bool stopCompression =
                // 1) misc keys
                (codeIntern >= Qt::Key_Escape && codeIntern <= Qt::Key_SysReq)
                // 2) cursor movement
                || (codeIntern >= Qt::Key_Home && codeIntern <= Qt::Key_PageDown)
                // 3) extra keys
                || (codeIntern >= Qt::Key_Super_L && codeIntern <= Qt::Key_Direction_R)
                // 4) something that a) doesn't translate to text or b) translates
                //    to newline text
                || (codeIntern == 0)
                || (textIntern.length() == 1 && textIntern.unicode()->unicode() == '\n');
            if (modifiersIntern == modifiers && !textIntern.isEmpty() && !stopCompression) {
                text += textIntern;
                count += countIntern;
            } else {
                XPutBackEvent(dpy, &evPress);
                XPutBackEvent(dpy, &evRelease);
                break;
            }
        }
    }

    // autorepeat compression makes sense for all widgets (Windows
    // does it automatically ....)
    if (event->type == XKeyPress && text.length() <= 1
#ifndef QT_NO_IM
        // input methods need discrete key events
        && !qic
#endif// QT_NO_IM
	) {
        XEvent dummy;

        for (;;) {
            auto_repeat_data.release = false;
            auto_repeat_data.error = false;
            if (! XCheckIfEvent(dpy, &dummy, &qt_keypress_scanner,
                                (XPointer) &auto_repeat_data))
                break;
            if (! XCheckIfEvent(dpy, &dummy, &qt_keyrelease_scanner,
                                (XPointer) &auto_repeat_data))
                break;

            count++;
            if (!text.isEmpty())
                text += text[0];
        }
    }

    return QKeyMapper::sendKeyEvent(keyWidget, grab, type, code, modifiers, text, autor,
                                    qMax(qMax(count,1), int(text.length())),
                                    event->xkey.keycode, keysym, event->xkey.state);
}

bool QKeyMapper::sendKeyEvent(QWidget *keyWidget, bool grab,
                              QEvent::Type type, int code, Qt::KeyboardModifiers modifiers,
                              const QString &text, bool autorepeat, int count,
                              quint32 nativeScanCode, quint32 nativeVirtualKey, quint32 nativeModifiers)
{
    // try the menukey first
    if (type == QEvent::KeyPress && code == Qt::Key_Menu) {
        QPoint pos = keyWidget->inputMethodQuery(Qt::ImMicroFocus).toRect().center();
        QContextMenuEvent e(QContextMenuEvent::Keyboard, pos, keyWidget->mapToGlobal(pos));
        qt_sendSpontaneousEvent(keyWidget, &e);
        if(e.isAccepted())
            return true;
    }

    Q_UNUSED(grab);
    QKeyEventEx e(type, code, modifiers, text, autorepeat, qMax(qMax(count,1), int(text.length())),
                  nativeScanCode, nativeVirtualKey, nativeModifiers);
    return qt_sendSpontaneousEvent(keyWidget, &e);
}