qt/multypo.cpp

   1 #include "multypo.h"
   2
   3 #include <QX11Info>
   4 #include <QDebug>
   5 #include <QVBoxLayout>
   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         /* Prepare colors */
  17         setStyleSheet("background-color: black; color: green");
  18
  19         /* Prepare conents */
  20         setLayout(new QVBoxLayout(this));
  21
  22         mainLabel = new QLabel("Hit <Esc> to quit", this);
  23         layout()->addWidget(mainLabel);
  24
  25         /* Fullscreen, no cursor */
  26         setWindowState(Qt::WindowFullScreen);
  27         setCursor(QCursor(Qt::BlankCursor));
  28 }
  29
  30 MultypoWindow::~MultypoWindow()
  31 {
  32 }
  33
  34 void MultypoWindow::handleKeyPress(int device, QString string)
  35 {
  36         qDebug() << "Device" << device << "String" << string;
  37
  38         if (string == "Escape")
  39                 close();
  40
  41         if (!players.contains(device)) {
  42                 QLabel *label = new QLabel(this);
  43                 layout()->addWidget(label);
  44                 players[device] = label;
  45         }
  46         players[device]->setText(players[device]->text() + string);
  47 }
  48
  49 bool MultypoWindow::handleX11Event(XEvent *event)
  50 {
  51         Display *dpy = x11Info().display();
  52         /* Handle the first map event: We are finally visible! */
  53         if (!xiInited && event->type == MapNotify) {
  54                 /* XInput Extension available? */
  55                 int eventID, errorID;
  56                 if (!XQueryExtension(dpy, "XInputExtension", &xiOpcode, &eventID, &errorID)) {
  57                    qCritical() << "X Input extension not available";
  58                 }
  59
  60                 /* Which version of XI2? We support 2.0 */
  61                 int major = 2, minor = 0;
  62                 if (XIQueryVersion(dpy, &major, &minor) == BadRequest) {
  63                         qCritical() << "XI2 not available. Server supports" << major << "." <<
  64                                                 minor;
  65                 }
  66
  67                 qDebug() << "System supports XI2";
  68
  69
  70                 // Now let's listen to keypress events
  71                 XIEventMask eventmask;
  72                 unsigned char mask [1] = { 0 }; // will change
  73                 eventmask.deviceid = XIAllMasterDevices;
  74                 eventmask.mask_len = sizeof (mask); // in bytes, for whatever reason...
  75                 eventmask.mask = mask;
  76                 XISetMask(mask, XI_KeyPress);
  77                 XISelectEvents (dpy, winId(), &eventmask, 1);
  78
  79                 // finally, grab all focuses
  80                 int ndevices;
  81                 XIDeviceInfo* devices = XIQueryDevice(dpy, XIAllMasterDevices, &ndevices);
  82                 for (int i = 0; i < ndevices; ++i) {
  83                         if (devices[i].use != XIMasterKeyboard) continue;
  84                         qDebug() << "Found master keyboard with ID" << devices[i].deviceid;
  85                         XISetFocus(dpy, devices[i].deviceid, winId(), CurrentTime);
  86                 }
  87                 XIFreeDeviceInfo(devices);
  88
  89                 xiInited = true;
  90
  91                 return false;
  92         }
  93         else if (xiInited && event->type == GenericEvent
  94                 && event->xcookie.type == GenericEvent && event->xcookie.extension == xiOpcode
  95                 && event->xcookie.evtype == XI_KeyPress && XGetEventData(dpy, &event->xcookie)) {
  96                 /* Handle XI event */
  97                 XIDeviceEvent *d_ev = (XIDeviceEvent*) event->xcookie.data;
  98             KeyCode keycode = d_ev->detail;
  99             int kbdid = d_ev->deviceid;
 100
 101                 if (!(d_ev->flags & XIKeyRepeat)) {
 102                         int keysyms_per_keycode;
 103                         KeySym keysym = XGetKeyboardMapping (dpy, keycode, 1, &keysyms_per_keycode)[0];
 104                         handleKeyPress(kbdid, XKeysymToString(keysym));
 105                 }
 106
 107                 XFreeEventData(dpy, &event->xcookie);
 108
 109                 return true;
 110         }
 111         else {
 112                 return false;
 113         }
 114 }