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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/extensions/XTest.h>
#include <unistd.h>
#include <X11/extensions/XInput2.h>
#include <pthread.h>
#include <math.h>
static Display *dpy;
static int scr, sw, sh;
static int sx = -1, sy = -1;
static Window root;
static const int direction = -1;
static const int pixels_to_scroll = 16;
static void scroll(int v) {
v = v * direction;
int btn;
if (v > 0) btn = 4;
else if (v < 0) btn = 5;
else return;
int times = ceil(abs(v) / pixels_to_scroll) + 1;
for (int i = 0; i < times; i++) {
XTestFakeButtonEvent(dpy, btn, True, CurrentTime);
XFlush(dpy);
XTestFakeButtonEvent(dpy, btn, False, CurrentTime);
XFlush(dpy);
}
}
static void select_events(Display *dpy, Window win) {
XIEventMask evmasks[1];
unsigned char mask1[(XI_LASTEVENT + 7)/8];
memset(mask1, 0, sizeof(mask1));
XISetMask(mask1, XI_RawButtonPress);
XISetMask(mask1, XI_RawButtonRelease);
evmasks[0].deviceid = XIAllMasterDevices;
evmasks[0].mask_len = sizeof(mask1);
evmasks[0].mask = mask1;
XISelectEvents(dpy, win, evmasks, 1);
XFlush(dpy);
}
static void getmousepos(int *px, int *py) {
Window r, child;
int rx, ry;
unsigned int mask;
XQueryPointer(dpy, root, &r, &child, px, py, &rx, &ry, &mask);
}
static void* loop() {
int px, py, lx, ly, dx, dy;
while (1) {
lx = px, ly = py;
getmousepos(&px, &py);
dx = px - lx;
dy = py - ly;
if (sx != -1 && sy != -1) scroll(dy);
if (dx != 0 | dy != 0) {
printf("%d, %d with deltas (%d, %d)\n", sx, sy, dx, dy);
}
sleep(0.1);
}
}
static void mouse_down(XIRawEvent *xev) {
getmousepos(&sx, &sy);
}
static void mouse_up(XIRawEvent *xev) {
sx = -1;
sy = -1;
}
int main(int argc, const char **argv) {
XInitThreads();
for (int i = 1; i < argc; i++) {
if (argv[i][1] == 'h') {
fprintf(stdout, "there is no help to be given\n");
}
}
if (!(dpy = XOpenDisplay(0x0))) return 1;
scr = DefaultScreen(dpy);
root = XDefaultRootWindow(dpy);
sw = DisplayWidth(dpy, scr);
sh = DisplayHeight(dpy, scr);
fprintf(stdout, "waiting for events...\n");
XEvent ev;
XIEvent *xi_event;
XIRawEvent *xev;
XGenericEventCookie *cookie = &ev.xcookie;
select_events(dpy, root);
pthread_t id[2];
pthread_create(&id[0], NULL, loop, &argv);
for (;;) {
if (XCheckTypedEvent(dpy, GenericEvent ,&ev)) {
if (cookie->type != GenericEvent || !XGetEventData(dpy, cookie)) {
continue;
}
xi_event = (XIEvent *) cookie->data;
xev = (XIRawEvent *) xi_event;
switch (cookie->evtype) {
case XI_RawButtonPress:
if (xev->detail == 2) mouse_down(xev);
break;
case XI_RawButtonRelease:
if (xev->detail == 2) mouse_up(xev);
break;
}
XFreeEventData(dpy, cookie);
}
} // there is no way out of this loop lol
XCloseDisplay(dpy);
return 0;
}
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