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x11.c
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#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <time.h>
#include <limits.h>
#include <math.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/keysym.h>
#include <X11/Xutil.h>
#include <X11/XKBlib.h>
#include <X11/extensions/XTest.h>
#include <X11/extensions/Xrandr.h>
#include <X11/extensions/XInput2.h>
#include "types.h"
#include "misc.h"
#include "platform.h"
#include "x11-keycodes.h"
static Display* xdisp = NULL;
static Window xrootwin;
static Window xwin;
static Pixmap cursor_pixmap;
static Cursor xcursor_blank;
static Atom et_selection_data;
static Atom utf8_string_atom;
static Atom targets_atom;
static Time last_xevent_time;
struct crtc_gamma {
XRRCrtcGamma* orig;
XRRCrtcGamma* alt;
};
static struct {
XRRScreenConfiguration* config;
XRRScreenResources* resources;
struct crtc_gamma* crtc_gammas;
} xrr;
static struct {
int opcode;
int errbase;
int evbase;
} xi2;
static struct {
const char* name;
Atom atom;
} clipboard_xatoms[] = {
{ "PRIMARY", XA_PRIMARY, },
{ "CLIPBOARD", None, }, /* filled in in platform_init() */
};
static char* clipboard_text;
static Time xselection_owned_since;
/* Clipboard contents are potentially sensitive, so wipe before freeing. */
static void clear_clipboard_cache(void)
{
if (clipboard_text)
explicit_bzero(clipboard_text, strlen(clipboard_text));
xfree(clipboard_text);
clipboard_text = NULL;
xselection_owned_since = 0;
}
/* Mask combining currently-applied modifiers and mouse buttons */
static unsigned int xstate;
#define MouseButtonMask \
(Button1Mask|Button2Mask|Button3Mask|Button4Mask|Button5Mask)
static struct rectangle screen_dimensions;
struct xypoint screen_center;
/* Handler to fire when mouse position changes (in master mode) */
static mousepos_handler_t* mousepos_handler;
struct scheduled_call {
void (*fn)(void* arg);
void* arg;
void (*arg_dtor)(void*);
uint64_t calltime;
struct scheduled_call* next;
};
static struct scheduled_call* scheduled_calls;
static void free_scheduled_call(struct scheduled_call* sc)
{
if (sc->arg_dtor)
sc->arg_dtor(sc->arg);
xfree(sc);
}
struct xhotkey {
KeyCode key;
unsigned int modmask;
hotkey_callback_t callback;
void* arg;
struct xhotkey* next;
};
static struct xhotkey* xhotkeys = NULL;
static const struct {
const char* name;
unsigned int mask;
} xmodifiers[] = {
[ShiftMapIndex] = { "shift", ShiftMask, },
[LockMapIndex] = { "lock", LockMask, },
[ControlMapIndex] = { "control", ControlMask, },
[Mod1MapIndex] = { "mod1", Mod1Mask, },
[Mod2MapIndex] = { "mod2", Mod2Mask, },
[Mod3MapIndex] = { "mod3", Mod3Mask, },
[Mod4MapIndex] = { "mod4", Mod4Mask, },
[Mod5MapIndex] = { "mod5", Mod5Mask, },
};
/* Some of these may get removed to account for NumLock, etc. */
static unsigned int relevant_modmask = \
(ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask);
static unsigned int get_mod_mask(KeySym modsym)
{
int i;
unsigned int modmask = 0;
KeyCode nlkc = XKeysymToKeycode(xdisp, modsym);
XModifierKeymap* modmap = XGetModifierMapping(xdisp);
for (i = 0; i < 8 * modmap->max_keypermod; i++) {
if (modmap->modifiermap[i] == nlkc) {
modmask = xmodifiers[i / modmap->max_keypermod].mask;
break;
}
}
XFreeModifiermap(modmap);
return modmask;
}
static int keygrab_err;
static int xerr_keygrab(Display* d, XErrorEvent* xev)
{
if (!keygrab_err)
keygrab_err = xev->error_code;
return 0;
}
static int set_keygrab(KeyCode kc, unsigned int orig_mask, int grab)
{
int ni, si, ci;
int (*prev_errhandler)(Display*, XErrorEvent*);
unsigned int modmask;
unsigned int nlk_mask = get_mod_mask(XK_Num_Lock);
unsigned int slk_mask = get_mod_mask(XK_Scroll_Lock);
unsigned int clk_mask = LockMask;
XSync(xdisp, False);
keygrab_err = 0;
prev_errhandler = XSetErrorHandler(xerr_keygrab);
/* Grab with all combinations of NumLock, ScrollLock and CapsLock */
for (ni = 0; ni < (nlk_mask ? 2 : 1); ni++) {
for (si = 0; si < (slk_mask ? 2 : 1); si++) {
for (ci = 0; ci < (clk_mask ? 2 : 1); ci++) {
modmask = (ci ? clk_mask : 0)
| (si ? slk_mask : 0)
| (ni ? nlk_mask : 0);
if (grab)
XGrabKey(xdisp, kc, modmask|orig_mask, xrootwin,
True, GrabModeAsync, GrabModeAsync);
else
XUngrabKey(xdisp, kc, modmask|orig_mask,
xrootwin);
if (keygrab_err)
goto out;
}
}
}
out:
XSync(xdisp, False);
XSetErrorHandler(prev_errhandler);
return keygrab_err;
}
static int grab_key(KeyCode kc, unsigned int modmask)
{
int status = set_keygrab(kc, modmask, 1);
if (status)
set_keygrab(kc, modmask, 0);
return status;
}
static inline int match_hotkey(const struct xhotkey* hk, const XKeyEvent* kev)
{
return kev->keycode == hk->key &&
(kev->state & relevant_modmask) == (hk->modmask & relevant_modmask);
}
static const struct xhotkey* find_hotkey(const XKeyEvent* kev)
{
const struct xhotkey* k;
for (k = xhotkeys; k; k = k->next) {
if (match_hotkey(k, kev))
return k;
}
return NULL;
}
#define XKEYMAP_SIZE 32
struct hotkey_context {
char keymap_state[XKEYMAP_SIZE];
};
static int do_hotkey(const XKeyEvent* kev)
{
struct hotkey_context ctx;
const struct xhotkey* k = find_hotkey(kev);
if (k) {
/*
* Possibly racy I think? Maybe check that keymap state
* hasn't changed since we got the hotkey event?
*/
XQueryKeymap(xdisp, ctx.keymap_state);
k->callback(&ctx, k->arg);
}
return !!k;
}
static keycode_t* get_keymap_modifiers(const char* keymap_state)
{
int i, bit;
keycode_t etk;
KeyCode kc;
KeySym sym;
int maxmods = ARR_LEN(xmodifiers) * 2; /* kludge */
keycode_t* modkeys = xmalloc((maxmods + 1) * sizeof(*modkeys));
int modcount = 0;
for (i = 0; i < XKEYMAP_SIZE; i++) {
if (!keymap_state[i])
continue;
for (bit = 0; bit < CHAR_BIT; bit++) {
if (keymap_state[i] & (1 << bit)) {
kc = (i * CHAR_BIT) + bit;
sym = XkbKeycodeToKeysym(xdisp, kc, 0, 0);
if (!IsModifierKey(sym))
continue;
etk = keysym_to_keycode(sym);
if (etk != ET_null) {
modkeys[modcount++] = etk;
if (modcount == maxmods)
goto out;
}
}
}
}
out:
modkeys[modcount] = ET_null;
return modkeys;
}
keycode_t* get_current_modifiers(void)
{
char keystate[XKEYMAP_SIZE];
XQueryKeymap(xdisp, keystate);
return get_keymap_modifiers(keystate);
}
keycode_t* get_hotkey_modifiers(hotkey_context_t ctx)
{
return get_keymap_modifiers(ctx->keymap_state);
}
static int parse_keystring(const char* ks, KeyCode* kc, unsigned int* modmask)
{
size_t klen;
int i, status;
KeySym sym;
const char* k = ks;
/* Scratch string buffer large enough to hold any substring of 'ks' */
char* tmp = xmalloc(strlen(ks)+1);
*kc = 0;
*modmask = 0;
while (*k) {
klen = strcspn(k, "+");
memcpy(tmp, k, klen);
tmp[klen] = '\0';
for (i = 0; i < ARR_LEN(xmodifiers); i++) {
if (!strcasecmp(xmodifiers[i].name, tmp)) {
*modmask |= xmodifiers[i].mask;
break;
}
}
/* If we found a modifer key, move on to the next key */
if (i < ARR_LEN(xmodifiers))
goto next;
sym = XStringToKeysym(tmp);
if (sym == NoSymbol) {
initerr("Invalid key: '%s'\n", tmp);
status = -1;
goto out;
}
if (!IsModifierKey(sym)) {
if (*kc) {
initerr("Invalid hotkey '%s': multiple non-modifier "
"keys\n", ks);
status = -1;
goto out;
}
*kc = XKeysymToKeycode(xdisp, sym);
if (!*kc) {
initerr("No keycode for keysym '%s'\n", tmp);
status = -1;
goto out;
}
} else {
initerr("'%s' is not a valid hotkey key\n", tmp);
status = -1;
goto out;
}
next:
k += klen;
if (*k) {
assert(*k == '+');
k += 1;
}
}
status = 0;
out:
xfree(tmp);
return status;
}
int bind_hotkey(const char* keystr, hotkey_callback_t cb, void* arg)
{
int status;
struct xhotkey* k;
KeyCode kc;
unsigned int modmask;
XKeyEvent kev;
if (parse_keystring(keystr, &kc, &modmask))
return -1;
/*
* Mock up a fake XKeyEvent to search for collisions with
* already-existing hotkey bindings.
*/
kev.keycode = kc;
kev.state = modmask;
if (find_hotkey(&kev)) {
initerr("hotkey '%s' conflicts with an earlier hotkey binding\n",
keystr);
return -1;
}
k = xmalloc(sizeof(*k));
k->key = kc;
k->modmask = modmask;
k->callback = cb;
k->arg = arg;
k->next = xhotkeys;
xhotkeys = k;
status = grab_key(kc, modmask);
switch (status) {
case 0:
break;
case BadAccess:
initerr("Failed to bind hotkey \"%s\" (already bound by another "
"process?)\n", keystr);
break;
case BadValue:
initerr("Invalid hotkey \"%s\" (?)\n", keystr);
break;
default:
initerr("Failed to bind hotkey \"%s\" for mysterious reasons...\n",
keystr);
break;
}
return status ? -1 : 0;
}
static int xrr_init(void)
{
int i;
int evbase, errbase;
int maj, min;
if (!XRRQueryExtension(xdisp, &evbase, &errbase)
|| !XRRQueryVersion(xdisp, &maj, &min)) {
initerr("XRandR extension unavailable\n");
return -1;
}
debug("XRandR extension version %d.%d\n", maj, min);
xrr.resources = XRRGetScreenResources(xdisp, xrootwin);
if (!xrr.resources) {
initerr("XRRGetScreenResources() failed\n");
return -1;
}
xrr.crtc_gammas = xmalloc(xrr.resources->ncrtc * sizeof(*xrr.crtc_gammas));
for (i = 0; i < xrr.resources->ncrtc; i++) {
xrr.crtc_gammas[i].orig = XRRGetCrtcGamma(xdisp, xrr.resources->crtcs[i]);
xrr.crtc_gammas[i].alt = XRRAllocGamma(xrr.crtc_gammas[i].orig->size);
}
return 0;
}
static void xrr_exit(void)
{
int i;
struct scheduled_call* sc;
for (i = 0; i < xrr.resources->ncrtc; i++) {
XRRFreeGamma(xrr.crtc_gammas[i].orig);
XRRFreeGamma(xrr.crtc_gammas[i].alt);
}
xfree(xrr.crtc_gammas);
XRRFreeScreenResources(xrr.resources);
XRRFreeScreenConfigInfo(xrr.config);
while (scheduled_calls) {
sc = scheduled_calls;
scheduled_calls = sc->next;
free_scheduled_call(sc);
}
}
static int xi2_init(void)
{
Status status;
unsigned char rawmask[XIMaskLen(XI_LASTEVENT)];
int maj = 2, min = 0;
XIEventMask ximask;
if (!XQueryExtension(xdisp, "XInputExtension", &xi2.opcode, &xi2.evbase,
&xi2.errbase)) {
initerr("XInputExtension unavailable\n");
return -1;
}
if (XIQueryVersion(xdisp, &maj, &min)) {
initerr("XIQueryVersion() failed\n");
return -1;
}
debug("XInput extension version %d.%d\n", maj, min);
/*
* The Saga of Global Pointer-Tracking under X: a Tale of Woe.
*
* In order to enable mouse-switching, we need to be able to detect
* any time the pointer hits a screen edge, and so need to receive
* pointer motion events at all times. The initial approach for this
* consisted of retrieving a list of all windows via XQueryTree() at
* initialization time and XSelectInput()ing all of them to request
* delivery of pointer motion events, as well as SubstructureNotify
* events to do the same for any children that pop up.
*
* This worked, mostly, but not always. Due to a stupid interaction
* between certain applications (Chrome/Chromium being an example at
* hand) and X11, if no one else has requested pointer motion events
* on a window and then we *do* (becoming the only client requesting
* them), pointer motion events then stop propagating up the window
* hierarchy, so said applications stop seeing them. This manifests
* itself, for example, as Chrome (at least as of version 38) not
* changing its mouse pointer to the link-clicking hand icon when
* mousing over a link.
*
* So we delve into XInput. I was hoping that just switching out the
* PointerMotion events for XI_Motion events would solve the problem,
* but sadly it seems that even requesting XI_Motion events still
* prevents such applications from receiving their motion events.
*
* So, as a last resort, we use XI_RawMotion events instead, which
* thankfully are just sent to the root window, so we don't need to do
* all the SubstructureNotify child-window tracking. However, these
* events are also...well, raw. While this is probably pretty much
* exactly what we want in the case where a remote is focused and
* we're sending relative motion events over to it, in the case where
* the master is focused and we're just trying to pick up on screen
* edge events, it's really not helpful at all. So, rather than try
* to open-loop re-create the X server's logic in tracking the
* effective logical absolute pointer position by summing up all the
* little deltas the raw events give us (and probably doing a crappy
* job of it), we instead just (inefficiently) call XQueryPointer() to
* see what the server thinks every time we get one. Sigh. Ugly, but
* at least it works, and doesn't seem to screw up other clients.
*/
memset(rawmask, 0, sizeof(rawmask));
ximask.mask = rawmask;
ximask.mask_len = sizeof(rawmask);
ximask.deviceid = XIAllMasterDevices;
XISetMask(ximask.mask, XI_RawMotion);
status = XISelectEvents(xdisp, xrootwin, &ximask, 1);
return status ? -1 : 0;
}
static int xtst_init(void)
{
int evbase, errbase;
int maj, min;
if (!XTestQueryExtension(xdisp, &evbase, &errbase, &maj, &min)) {
initerr("XTest extension unavailable\n");
return -1;
}
debug("XTest extension version %d.%d\n", maj, min);
return 0;
}
static void log_xerr(unsigned int level, Display* d, XErrorEvent* xev, const char* pfx)
{
char errbuf[1024];
XGetErrorText(d, xev->error_code, errbuf, sizeof(errbuf));
errbuf[sizeof(errbuf)-1] = '\0';
mlog(level, "%s X Error: request %hhu.%hhu -> %s\n", pfx, xev->request_code,
xev->minor_code, errbuf);
}
static int xerr_abort(Display* d, XErrorEvent* xev)
{
log_xerr(LL_ERROR, d, xev, "Fatal");
abort();
}
int platform_init(struct kvmap* params, mousepos_handler_t* mouse_handler)
{
int status;
unsigned int i;
Atom atom;
char bitmap[1] = { 0, };
XColor black = { .red = 0, .green = 0, .blue = 0, };
unsigned long blackpx;
if (params && kvmap_get(params, "DISPLAY"))
setenv("DISPLAY", kvmap_get(params, "DISPLAY"), 1);
XSetErrorHandler(xerr_abort);
x11_keycodes_init();
xdisp = XOpenDisplay(NULL);
if (!xdisp) {
initerr("X11 init: failed to open display\n");
return -1;
}
screen_dimensions.x.min = 0;
screen_dimensions.x.max = WidthOfScreen(XScreenOfDisplay(xdisp, XDefaultScreen(xdisp))) - 1;
screen_dimensions.y.min = 0;
screen_dimensions.y.max = HeightOfScreen(XScreenOfDisplay(xdisp, XDefaultScreen(xdisp))) - 1;
screen_center.x = screen_dimensions.x.max / 2;
screen_center.y = screen_dimensions.y.max / 2;
xrootwin = XDefaultRootWindow(xdisp);
blackpx = BlackPixel(xdisp, XDefaultScreen(xdisp));
xwin = XCreateSimpleWindow(xdisp, xrootwin, 0, 0, 1, 1, 0, blackpx, blackpx);
XStoreName(xdisp, xwin, "enthrall");
et_selection_data = XInternAtom(xdisp, "ET_SELECTION_DATA", False);
utf8_string_atom = XInternAtom(xdisp, "UTF8_STRING", False);
targets_atom = XInternAtom(xdisp, "TARGETS", False);
for (i = 0; i < ARR_LEN(clipboard_xatoms); i++) {
if (clipboard_xatoms[i].atom == None) {
atom = XInternAtom(xdisp, clipboard_xatoms[i].name, False);
clipboard_xatoms[i].atom = atom;
}
}
/* Create the blank cursor used when grabbing input */
cursor_pixmap = XCreatePixmapFromBitmapData(xdisp, xrootwin, bitmap, 1, 1, 0, 0, 1);
xcursor_blank = XCreatePixmapCursor(xdisp, cursor_pixmap, cursor_pixmap,
&black, &black, 0, 0);
/* Clear any key grabs (not that any should exist, really...) */
XUngrabKey(xdisp, AnyKey, AnyModifier, xrootwin);
/*
* Remove scroll lock and num lock from the set of modifiers we pay
* attention to in matching hotkey bindings
*/
relevant_modmask &= ~(get_mod_mask(XK_Scroll_Lock)
| get_mod_mask(XK_Num_Lock));
mousepos_handler = mouse_handler;
status = xrr_init();
if (!status)
status = xi2_init();
if (!status)
status = xtst_init();
return status;
}
void platform_exit(void)
{
struct xhotkey* hk;
set_display_brightness(1.0);
xrr_exit();
XFreeCursor(xdisp, xcursor_blank);
XFreePixmap(xdisp, cursor_pixmap);
XDestroyWindow(xdisp, xwin);
XCloseDisplay(xdisp);
x11_keycodes_exit();
while (xhotkeys) {
hk = xhotkeys;
xhotkeys = hk->next;
xfree(hk);
}
clear_clipboard_cache();
}
#if defined(CLOCK_MONOTONIC_RAW)
#define CGT_CLOCK CLOCK_MONOTONIC_RAW
#elif defined(CLOCK_UPTIME_PRECISE)
#define CGT_CLOCK CLOCK_UPTIME_PRECISE
#else
#error no CGT_CLOCK!
#endif
uint64_t get_microtime(void)
{
struct timespec ts;
if (clock_gettime(CGT_CLOCK, &ts)) {
perror("clock_gettime");
abort();
}
return (ts.tv_sec * 1000000) + (ts.tv_nsec / 1000);
}
void get_screen_dimensions(struct rectangle* d)
{
*d = screen_dimensions;
}
static struct xypoint get_mousepos_and_mask(unsigned int* mask)
{
Window xchildwin, root_ret;
int child_x, child_y, tmp_x, tmp_y;
struct xypoint pt;
Bool onscreen = XQueryPointer(xdisp, xrootwin, &root_ret, &xchildwin,
&tmp_x, &tmp_y, &child_x, &child_y,
mask);
assert(root_ret == xrootwin);
if (!onscreen) {
errlog("X11 pointer not on screen?\n");
abort();
}
pt.x = tmp_x;
pt.y = tmp_y;
*mask &= relevant_modmask;
return pt;
}
struct xypoint get_mousepos(void)
{
unsigned int tmpmask;
return get_mousepos_and_mask(&tmpmask);
}
void set_mousepos(struct xypoint pt)
{
XTestFakeMotionEvent(xdisp, -1, pt.x, pt.y, CurrentTime);
XFlush(xdisp);
}
void move_mousepos(int32_t dx, int32_t dy)
{
XTestFakeRelativeMotionEvent(xdisp, dx, dy, CurrentTime);
XFlush(xdisp);
if (mousepos_handler)
mousepos_handler(get_mousepos());
}
static const mousebutton_t pi_mousebuttons[] = {
[Button1] = MB_LEFT,
[Button2] = MB_CENTER,
[Button3] = MB_RIGHT,
[Button4] = MB_SCROLLUP,
[Button5] = MB_SCROLLDOWN,
};
static const struct {
unsigned int button, mask;
} x11_mousebuttons[] = {
[MB_LEFT] = { Button1, Button1Mask, },
[MB_CENTER] = { Button2, Button2Mask, },
[MB_RIGHT] = { Button3, Button3Mask, },
[MB_SCROLLUP] = { Button4, Button4Mask, },
[MB_SCROLLDOWN] = { Button5, Button5Mask, },
};
void do_clickevent(mousebutton_t button, pressrel_t pr)
{
XTestFakeButtonEvent(xdisp, LOOKUP(button, x11_mousebuttons).button,
pr == PR_PRESS, CurrentTime);
XFlush(xdisp);
/* Update modifier/mousebutton state */
if (pr == PR_PRESS)
xstate |= LOOKUP(button, x11_mousebuttons).mask;
else
xstate &= ~LOOKUP(button, x11_mousebuttons).mask;
}
static unsigned int modmask_for_xkeycode(KeyCode xkc)
{
KeySym sym = XkbKeycodeToKeysym(xdisp, xkc, 0, 0);
if (!IsModifierKey(sym))
return 0;
else
return get_mod_mask(sym);
}
void do_keyevent(keycode_t key, pressrel_t pr)
{
unsigned int modmask;
KeyCode xkc = keycode_to_xkeycode(xdisp, key);
XTestFakeKeyEvent(xdisp, xkc, pr == PR_PRESS, CurrentTime);
XFlush(xdisp);
modmask = modmask_for_xkeycode(xkc);
if (modmask) {
if (pr == PR_PRESS)
xstate |= modmask;
else
xstate &= ~modmask;
}
}
static inline const char* grab_failure_message(int status)
{
switch (status) {
case AlreadyGrabbed: return "AlreadyGrabbed";
case GrabInvalidTime: return "GrabInvalidTime";
case GrabFrozen: return "GrabFrozen";
default: return "(unknown error)";
}
}
static struct xypoint saved_mousepos;
#define PointerEventsMask (PointerMotionMask|ButtonPressMask|ButtonReleaseMask)
int grab_inputs(void)
{
int status;
saved_mousepos = get_mousepos();
status = XGrabKeyboard(xdisp, xrootwin, False, GrabModeAsync,
GrabModeAsync, CurrentTime);
if (status) {
errlog("Failed to grab keyboard: %s\n", grab_failure_message(status));
return status;
}
status = XGrabPointer(xdisp, xrootwin, False, PointerEventsMask,
GrabModeAsync, GrabModeAsync, None, xcursor_blank, CurrentTime);
if (status) {
XUngrabKeyboard(xdisp, CurrentTime);
errlog("Failed to grab pointer: %s\n", grab_failure_message(status));
return status;
}
set_mousepos(screen_center);
XSync(xdisp, False);
return status;
}
void ungrab_inputs(int restore_mousepos)
{
XUngrabKeyboard(xdisp, CurrentTime);
XUngrabPointer(xdisp, CurrentTime);
if (restore_mousepos)
set_mousepos(saved_mousepos);
XSync(xdisp, False);
}
static struct xypoint last_seen_mousepos;
static void get_xevent(XEvent* e)
{
XNextEvent(xdisp, e);
/* This is kind of gross... */
#define GETTIME(type, structname) \
case type: last_xevent_time = e->x##structname.time; break
switch (e->type) {
GETTIME(KeyPress, key);
GETTIME(KeyRelease, key);
GETTIME(ButtonPress, button);
GETTIME(ButtonRelease, button);
GETTIME(MotionNotify, motion);
GETTIME(PropertyNotify, property);
GETTIME(SelectionClear, selectionclear);
GETTIME(SelectionRequest, selectionrequest);
GETTIME(SelectionNotify, selection);
#undef GETTIME
default: break;
}
}
static Status send_selection_notify(const XSelectionRequestEvent* req, Atom property)
{
XEvent ev;
XSelectionEvent* resp = &ev.xselection;
resp->type = SelectionNotify;
resp->display = req->display;
resp->requestor = req->requestor;
resp->selection = req->selection;
resp->target = req->target;
resp->property = property;
resp->time = req->time;
return XSendEvent(xdisp, req->requestor, False, 0, &ev);
}
static int is_known_clipboard_xatom(Atom atom)
{
int i;
if (atom == None)
return 0;
for (i = 0; i < ARR_LEN(clipboard_xatoms); i++) {
if (clipboard_xatoms[i].atom == atom)
return 1;
}
return 0;
}
static void handle_selection_request(const XSelectionRequestEvent* req)
{
Atom property;
Atom supported_targets[] = { targets_atom, utf8_string_atom, XA_STRING, };
/*
* ICCCM sec. 2.2:
*
* "If the specified property is None , the requestor is an obsolete
* client. Owners are encouraged to support these clients by using
* the specified target atom as the property name to be used for the
* reply."
*/
property = (req->property == None) ? req->target : req->property;
if (!clipboard_text
|| (req->time != CurrentTime && req->time < xselection_owned_since)
|| req->owner != xwin || !is_known_clipboard_xatom(req->selection)) {
property = None;
} else if (req->target == targets_atom) {
/* Tell the requesting client what selection formats we support */
XChangeProperty(xdisp, req->requestor, property, XA_ATOM, 32,
PropModeReplace, (unsigned char*)supported_targets,
ARR_LEN(supported_targets));
} else if (req->target == XA_STRING || req->target == utf8_string_atom) {
/* Send the requested data back to the requesting window */
XChangeProperty(xdisp, req->requestor, property, req->target, 8,
PropModeReplace, (unsigned char*)clipboard_text,
strlen(clipboard_text));
} else {
property = None;
}
/* Acknowledge that the transfer has been made (or failed) */
if (!send_selection_notify(req, property))
errlog("Failed to send SelectionNotify to requestor\n");
}
static void handle_keyevent(XKeyEvent* kev, pressrel_t pr)
{
KeySym sym;
keycode_t kc;
sym = XLookupKeysym(kev, 0);
kc = keysym_to_keycode(sym);
if (kc == ET_null) {
warn("No mapping for keysym %lu (%s)\n", sym, XKeysymToString(sym));
return;
}
if (!is_remote(focused_node)) {
vinfo("keyevent (%s %s, modmask=%#x) with no focused remote\n",
XKeysymToString(sym), pr == PR_PRESS ? "pressed" : "released",
kev->state);
return;
}
send_keyevent(focused_node->remote, kc, pr);
}
static inline void update_last_mousepos(XMotionEvent* mev)
{
last_seen_mousepos = (struct xypoint){ .x = mev->x_root, .y = mev->y_root, };
}
static void handle_grabbed_mousemove(XMotionEvent* mev)
{
if (mev->x_root == screen_center.x
&& mev->y_root == screen_center.y)
return;
send_moverel(focused_node->remote, mev->x_root - last_seen_mousepos.x,
mev->y_root - last_seen_mousepos.y);
if (abs(mev->x_root - screen_center.x) > 1
|| abs(mev->y_root - screen_center.y) > 1) {
set_mousepos(screen_center);
last_seen_mousepos = screen_center;
} else {
update_last_mousepos(mev);
}
}
static void handle_local_mousemove(XMotionEvent* mev)
{
/* Only trigger edge events when no mouse buttons are held */
if (mousepos_handler && !(mev->state & MouseButtonMask))
mousepos_handler((struct xypoint){ .x = mev->x_root, .y = mev->y_root, });
update_last_mousepos(mev);
}
static void handle_rawmotion(XIRawEvent* rev)
{
unsigned int mask;