qt/multypo.cpp

   1 #include "multypo.h"
   2
   3 #include <QX11Info>
   4 #include <QDebug>
   5 #include <QHBoxLayout>
   6 #include <QLabel>
   7
   8 #include <X11/Xlib.h>
   9 #include <X11/extensions/XInput2.h>
  10 #include <X11/Xutil.h>
  11
  12 MultypoWindow::MultypoWindow(QWidget *parent) :
  13         QWidget(parent),
  14         xiInited(false)
  15 {
  16         QHBoxLayout *layout = new QHBoxLayout(this);
  17         setLayout(layout);
  18
  19         mainLabel = new QLabel(this);
  20         layout->addWidget(mainLabel);
  21
  22         setMinimumSize(300, 300);
  23 }
  24
  25 MultypoWindow::~MultypoWindow()
  26 {
  27 }
  28
  29 void MultypoWindow::handleKeyPress(int device, QString string)
  30 {
  31         qDebug() << "Device" << device << "String" << string;
  32         mainLabel->setText(QString("%1 pressed on %2").arg(string).arg(device));
  33 }
  34
  35 bool MultypoWindow::handleX11Event(XEvent *event)
  36 {
  37         Display *dpy = x11Info().display();
  38         /* Handle the first map event: We are finally visible! */
  39         if (!xiInited && event->type == MapNotify) {
  40                 /* XInput Extension available? */
  41                 int eventID, errorID;
  42                 if (!XQueryExtension(dpy, "XInputExtension", &xiOpcode, &eventID, &errorID)) {
  43                    qCritical() << "X Input extension not available";
  44                 }
  45
  46                 /* Which version of XI2? We support 2.0 */
  47                 int major = 2, minor = 0;
  48                 if (XIQueryVersion(dpy, &major, &minor) == BadRequest) {
  49                         qCritical() << "XI2 not available. Server supports" << major << "." <<
  50                                                 minor;
  51                 }
  52
  53                 qDebug() << "System supports XI2";
  54
  55
  56                 // Now let's listen to keypress events
  57                 XIEventMask eventmask;
  58                 unsigned char mask [1] = { 0 }; // will change
  59                 eventmask.deviceid = XIAllMasterDevices;
  60                 eventmask.mask_len = sizeof (mask); // in bytes, for whatever reason...
  61                 eventmask.mask = mask;
  62                 XISetMask(mask, XI_KeyPress);
  63                 XISelectEvents (dpy, winId(), &eventmask, 1);
  64
  65                 // finally, grab all focuses
  66                 int ndevices;
  67                 XIDeviceInfo* devices = XIQueryDevice(dpy, XIAllMasterDevices, &ndevices);
  68                 for (int i = 0; i < ndevices; ++i) {
  69                         if (devices[i].use != XIMasterKeyboard) continue;
  70                         qDebug() << "Found master keyboard with ID" << devices[i].deviceid;
  71                         XISetFocus(dpy, devices[i].deviceid, winId(), CurrentTime);
  72                 }
  73
  74                 xiInited = true;
  75
  76                 return false;
  77         }
  78         else if (xiInited && event->type == GenericEvent
  79                 && event->xcookie.type == GenericEvent && event->xcookie.extension == xiOpcode
  80                 && event->xcookie.evtype == XI_KeyPress && XGetEventData(dpy, &event->xcookie)) {
  81                 /* Handle XI event */
  82                 XIDeviceEvent *d_ev = (XIDeviceEvent*) event->xcookie.data;
  83             KeyCode keycode = d_ev->detail;
  84             int kbdid = d_ev->deviceid;
  85
  86                 if (!(d_ev->flags & XIKeyRepeat)) {
  87                         int keysyms_per_keycode;
  88                         KeySym keysym = XGetKeyboardMapping (dpy, keycode, 1, &keysyms_per_keycode)[0];
  89                         handleKeyPress(kbdid, XKeysymToString(keysym));
  90                 }
  91
  92                 XFreeEventData(dpy, &event->xcookie);
  93
  94                 return true;
  95         }
  96         else {
  97                 return false;
  98         }
  99 }