barrier/server/CXWindowsPrimaryScreen.cpp

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#include "CXWindowsPrimaryScreen.h"
#include "CXWindowsClipboard.h"
#include "CXWindowsScreenSaver.h"
#include "CXWindowsUtil.h"
#include "CClipboard.h"
#include "IServer.h"
#include "ProtocolTypes.h"
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#include "CThread.h"
#include "CLog.h"
#include "CStopwatch.h"
#if defined(X_DISPLAY_MISSING)
# error X11 is required to build synergy
#else
# include <X11/X.h>
# include <X11/Xutil.h>
# define XK_MISCELLANY
# include <X11/keysymdef.h>
#endif
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//
// CXWindowsPrimaryScreen
//
CXWindowsPrimaryScreen::CXWindowsPrimaryScreen(IServer* server) :
m_server(server),
m_active(false),
m_window(None)
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{
// do nothing
}
CXWindowsPrimaryScreen::~CXWindowsPrimaryScreen()
{
assert(m_window == None);
}
void
CXWindowsPrimaryScreen::run()
{
for (;;) {
// wait for and get the next event
XEvent xevent;
if (!getEvent(&xevent)) {
break;
}
// handle event
switch (xevent.type) {
case CreateNotify:
{
// select events on new window
CDisplayLock display(this);
selectEvents(display, xevent.xcreatewindow.window);
}
break;
case MappingNotify:
{
// keyboard mapping changed
CDisplayLock display(this);
XRefreshKeyboardMapping(&xevent.xmapping);
updateModifierMap(display);
}
break;
case ClientMessage:
if (xevent.xclient.message_type == m_atomScreenSaver ||
xevent.xclient.format == 32) {
// screen saver activation/deactivation event
m_server->onScreenSaver(xevent.xclient.data.l[0] != 0);
}
break;
case KeyPress:
{
log((CLOG_DEBUG1 "event: KeyPress code=%d, state=0x%04x", xevent.xkey.keycode, xevent.xkey.state));
const KeyModifierMask mask = mapModifier(xevent.xkey.state);
const KeyID key = mapKey(&xevent.xkey);
if (key != kKeyNone) {
m_server->onKeyDown(key, mask);
if (key == XK_Caps_Lock && m_capsLockHalfDuplex) {
m_server->onKeyUp(key, mask | KeyModifierCapsLock);
}
else if (key == XK_Num_Lock && m_numLockHalfDuplex) {
m_server->onKeyUp(key, mask | KeyModifierNumLock);
}
}
}
break;
case KeyRelease:
{
const KeyModifierMask mask = mapModifier(xevent.xkey.state);
const KeyID key = mapKey(&xevent.xkey);
if (key != kKeyNone) {
// check if this is a key repeat by getting the next
// KeyPress event that has the same key and time as
// this release event, if any. first prepare the
// filter info.
CKeyEventInfo filter;
filter.m_event = KeyPress;
filter.m_window = xevent.xkey.window;
filter.m_time = xevent.xkey.time;
filter.m_keycode = xevent.xkey.keycode;
// now check for event
XEvent xevent2;
CDisplayLock display(this);
if (XCheckIfEvent(display, &xevent2,
&CXWindowsPrimaryScreen::findKeyEvent,
(XPointer)&filter) != True) {
// no press event follows so it's a plain release
log((CLOG_DEBUG1 "event: KeyRelease code=%d, state=0x%04x", xevent.xkey.keycode, xevent.xkey.state));
if (key == XK_Caps_Lock && m_capsLockHalfDuplex) {
m_server->onKeyDown(key, mask);
}
else if (key == XK_Num_Lock && m_numLockHalfDuplex) {
m_server->onKeyDown(key, mask);
}
m_server->onKeyUp(key, mask);
}
else {
// found a press event following so it's a repeat.
// we could attempt to count the already queued
// repeats but we'll just send a repeat of 1.
// note that we discard the press event.
log((CLOG_DEBUG1 "event: repeat code=%d, state=0x%04x", xevent.xkey.keycode, xevent.xkey.state));
m_server->onKeyRepeat(key, mask, 1);
}
}
}
break;
case ButtonPress:
{
log((CLOG_DEBUG1 "event: ButtonPress button=%d", xevent.xbutton.button));
const ButtonID button = mapButton(xevent.xbutton.button);
if (button != kButtonNone) {
m_server->onMouseDown(button);
}
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}
break;
case ButtonRelease:
{
log((CLOG_DEBUG1 "event: ButtonRelease button=%d", xevent.xbutton.button));
const ButtonID button = mapButton(xevent.xbutton.button);
if (button != kButtonNone) {
m_server->onMouseUp(button);
}
else if (xevent.xbutton.button == 4) {
// wheel forward (away from user)
m_server->onMouseWheel(120);
}
else if (xevent.xbutton.button == 5) {
// wheel backward (toward user)
m_server->onMouseWheel(-120);
}
}
break;
case MotionNotify:
{
log((CLOG_DEBUG2 "event: MotionNotify %d,%d", xevent.xmotion.x_root, xevent.xmotion.y_root));
// compute motion delta (relative to the last known
// mouse position)
SInt32 x = xevent.xmotion.x_root - m_x;
SInt32 y = xevent.xmotion.y_root - m_y;
// save position to compute delta of next motion
m_x = xevent.xmotion.x_root;
m_y = xevent.xmotion.y_root;
if (xevent.xmotion.send_event) {
// we warped the mouse. discard events until we
// find the matching sent event. see
// warpCursorNoLockNoFlush() for where the events
// are sent. we discard the matching sent event
// and can be sure we've skipped the warp event.
CDisplayLock display(this);
do {
XMaskEvent(display, PointerMotionMask, &xevent);
} while (!xevent.xmotion.send_event);
}
else if (!m_active) {
// motion on primary screen
m_server->onMouseMovePrimary(m_x, m_y);
}
else {
// motion on secondary screen. warp mouse back to
// center.
//
// my lombard (powerbook g3) running linux and
// using the adbmouse driver has two problems:
// first, the driver only sends motions of +/-2
// pixels and, second, it seems to discard some
// physical input after a warp. the former isn't a
// big deal (we're just limited to every other
// pixel) but the latter is a PITA. to work around
// it we only warp when the mouse has moved more
// than s_size pixels from the center.
static const SInt32 s_size = 32;
if (xevent.xmotion.x_root - m_xCenter < -s_size ||
xevent.xmotion.x_root - m_xCenter > s_size ||
xevent.xmotion.y_root - m_yCenter < -s_size ||
xevent.xmotion.y_root - m_yCenter > s_size) {
CDisplayLock display(this);
warpCursorNoLockNoFlush(display, m_xCenter, m_yCenter);
}
// send event if mouse moved. do this after warping
// back to center in case the motion takes us onto
// the primary screen. if we sent the event first
// in that case then the warp would happen after
// warping to the primary screen's enter position,
// effectively overriding it.
if (x != 0 || y != 0) {
m_server->onMouseMoveSecondary(x, y);
}
}
}
break;
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}
}
}
void
CXWindowsPrimaryScreen::stop()
{
CDisplayLock display(this);
doStop();
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}
void
CXWindowsPrimaryScreen::open()
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{
// open the display
openDisplay();
// check for peculiarities
// FIXME -- may have to get these from some database
m_numLockHalfDuplex = false;
m_capsLockHalfDuplex = false;
// m_numLockHalfDuplex = true;
// m_capsLockHalfDuplex = true;
// get screen shape
SInt32 x, y, w, h;
getScreenShape(x, y, w, h);
{
CDisplayLock display(this);
// get notified of screen saver activation/deactivation
m_atomScreenSaver = XInternAtom(display, "SCREENSAVER", False);
getScreenSaver()->setNotify(m_window);
// update key state
updateModifierMap(display);
// get mouse position
Window root, window;
int mx, my, xWindow, yWindow;
unsigned int mask;
if (!XQueryPointer(display, m_window, &root, &window,
&mx, &my, &xWindow, &yWindow, &mask)) {
mx = w >> 1;
my = h >> 1;
}
// save mouse position
m_x = mx;
m_y = my;
}
// save position of center of screen
m_xCenter = x + (w >> 1);
m_yCenter = y + (h >> 1);
// send screen info
CClientInfo info;
info.m_x = x;
info.m_y = y;
info.m_w = w;
info.m_h = h;
info.m_zoneSize = 1;
info.m_mx = m_x;
info.m_my = m_y;
m_server->onInfoChanged("", info);
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}
void
CXWindowsPrimaryScreen::close()
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{
// stop being notified of screen saver activation/deactivation
getScreenSaver()->setNotify(None);
m_atomScreenSaver = None;
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// close the display
closeDisplay();
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}
void
CXWindowsPrimaryScreen::enter(SInt32 x, SInt32 y, bool forScreenSaver)
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{
log((CLOG_INFO "entering primary at %d,%d%s", x, y, forScreenSaver ? " for screen saver" : ""));
assert(m_active == true);
assert(m_window != None);
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CDisplayLock display(this);
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// unmap the grab window. this also ungrabs the mouse and keyboard.
XUnmapWindow(display, m_window);
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// warp to requested location
if (!forScreenSaver) {
warpCursorNoLock(display, x, y);
}
// redirect input to root window. do not warp the mouse because
// that will deactivate the screen saver.
else {
XSetInputFocus(display, PointerRoot, PointerRoot, CurrentTime);
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}
// not active anymore
m_active = false;
}
bool
CXWindowsPrimaryScreen::leave()
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{
log((CLOG_INFO "leaving primary"));
assert(m_active == false);
assert(m_window != None);
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CDisplayLock display(this);
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// raise and show the input window
XMapRaised(display, m_window);
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// grab the mouse and keyboard. keep trying until we get them.
// if we can't grab one after grabbing the other then ungrab
// and wait before retrying. give up after s_timeout seconds.
static const double s_timeout = 1.0;
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int result;
CStopwatch timer;
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do {
// keyboard first
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do {
result = XGrabKeyboard(display, m_window, True,
GrabModeAsync, GrabModeAsync, CurrentTime);
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assert(result != GrabNotViewable);
if (result != GrabSuccess) {
log((CLOG_DEBUG2 "waiting to grab keyboard"));
CThread::sleep(0.05);
if (timer.getTime() >= s_timeout) {
log((CLOG_DEBUG2 "grab keyboard timed out"));
XUnmapWindow(display, m_window);
return false;
}
}
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} while (result != GrabSuccess);
log((CLOG_DEBUG2 "grabbed keyboard"));
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// now the mouse
result = XGrabPointer(display, m_window, True, 0,
GrabModeAsync, GrabModeAsync,
m_window, None, CurrentTime);
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assert(result != GrabNotViewable);
if (result != GrabSuccess) {
// back off to avoid grab deadlock
XUngrabKeyboard(display, CurrentTime);
log((CLOG_DEBUG2 "ungrabbed keyboard, waiting to grab pointer"));
CThread::sleep(0.05);
if (timer.getTime() >= s_timeout) {
log((CLOG_DEBUG2 "grab pointer timed out"));
XUnmapWindow(display, m_window);
return false;
}
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}
} while (result != GrabSuccess);
log((CLOG_DEBUG1 "grabbed pointer and keyboard"));
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// warp mouse to center
warpCursorNoLock(display, m_xCenter, m_yCenter);
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// local client now active
m_active = true;
return true;
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}
void
CXWindowsPrimaryScreen::reconfigure()
{
// do nothing
}
void
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CXWindowsPrimaryScreen::warpCursor(SInt32 x, SInt32 y)
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{
CDisplayLock display(this);
warpCursorNoLock(display, x, y);
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}
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void
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CXWindowsPrimaryScreen::warpCursorNoLock(Display* display, SInt32 x, SInt32 y)
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{
// warp mouse
warpCursorNoLockNoFlush(display, x, y);
// remove all input events before and including warp
XEvent event;
while (XCheckMaskEvent(display, PointerMotionMask |
ButtonPressMask | ButtonReleaseMask |
KeyPressMask | KeyReleaseMask |
KeymapStateMask,
&event)) {
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// do nothing
}
// save position as last position
m_x = x;
m_y = y;
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}
void
CXWindowsPrimaryScreen::warpCursorNoLockNoFlush(
Display* display, SInt32 x, SInt32 y)
{
assert(display != NULL);
assert(m_window != None);
// send an event that we can recognize before the mouse warp
XEvent eventBefore;
eventBefore.type = MotionNotify;
eventBefore.xmotion.display = display;
eventBefore.xmotion.window = m_window;
eventBefore.xmotion.root = getRoot();
eventBefore.xmotion.subwindow = m_window;
eventBefore.xmotion.time = CurrentTime;
eventBefore.xmotion.x = x;
eventBefore.xmotion.y = y;
eventBefore.xmotion.x_root = x;
eventBefore.xmotion.y_root = y;
eventBefore.xmotion.state = 0;
eventBefore.xmotion.is_hint = False;
eventBefore.xmotion.same_screen = True;
XEvent eventAfter = eventBefore;
XSendEvent(display, m_window, False, 0, &eventBefore);
// warp mouse
XWarpPointer(display, None, getRoot(), 0, 0, 0, 0, x, y);
// send an event that we can recognize after the mouse warp
XSendEvent(display, m_window, False, 0, &eventAfter);
XSync(display, False);
log((CLOG_DEBUG2 "warped to %d,%d", x, y));
}
void
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CXWindowsPrimaryScreen::setClipboard(ClipboardID id,
const IClipboard* clipboard)
{
setDisplayClipboard(id, clipboard);
}
void
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CXWindowsPrimaryScreen::grabClipboard(ClipboardID id)
{
setDisplayClipboard(id, NULL);
}
void
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CXWindowsPrimaryScreen::getClipboard(ClipboardID id,
IClipboard* clipboard) const
{
getDisplayClipboard(id, clipboard);
}
KeyModifierMask
CXWindowsPrimaryScreen::getToggleMask() const
{
CDisplayLock display(this);
// query the pointer to get the keyboard state
// FIXME -- is there a better way to do this?
Window root, window;
int xRoot, yRoot, xWindow, yWindow;
unsigned int state;
if (!XQueryPointer(display, m_window, &root, &window,
&xRoot, &yRoot, &xWindow, &yWindow, &state)) {
return 0;
}
// convert to KeyModifierMask
KeyModifierMask mask = 0;
if (state & m_numLockMask)
mask |= KeyModifierNumLock;
if (state & m_capsLockMask)
mask |= KeyModifierCapsLock;
if (state & m_scrollLockMask)
mask |= KeyModifierScrollLock;
return mask;
}
bool
CXWindowsPrimaryScreen::isLockedToScreen() const
{
CDisplayLock display(this);
// query the pointer to get the button state
Window root, window;
int xRoot, yRoot, xWindow, yWindow;
unsigned int state;
if (XQueryPointer(display, m_window, &root, &window,
&xRoot, &yRoot, &xWindow, &yWindow, &state)) {
if ((state & (Button1Mask | Button2Mask | Button3Mask |
Button4Mask | Button5Mask)) != 0) {
return true;
}
}
// get logical keyboard state
char keyMap[32];
memset(keyMap, 0, sizeof(keyMap));
XQueryKeymap(display, keyMap);
// locked if any key is down
for (unsigned int i = 0; i < sizeof(keyMap); ++i) {
if (keyMap[i] != 0) {
return true;
}
}
// not locked
return false;
}
void
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CXWindowsPrimaryScreen::onOpenDisplay(Display* display)
{
assert(m_window == None);
// get size of screen
SInt32 x, y, w, h;
getScreenShape(x, y, w, h);
// create the grab window. this window is used to capture user
// input when the user is focussed on another client. don't let
// the window manager mess with it.
XSetWindowAttributes attr;
attr.event_mask = PointerMotionMask |// PointerMotionHintMask |
ButtonPressMask | ButtonReleaseMask |
KeyPressMask | KeyReleaseMask |
KeymapStateMask | PropertyChangeMask;
attr.do_not_propagate_mask = 0;
attr.override_redirect = True;
attr.cursor = createBlankCursor();
m_window = XCreateWindow(display, getRoot(), x, y, w, h, 0, 0,
InputOnly, CopyFromParent,
CWDontPropagate | CWEventMask |
CWOverrideRedirect | CWCursor,
&attr);
log((CLOG_DEBUG "window is 0x%08x", m_window));
// start watching for events on other windows
selectEvents(display, getRoot());
}
CXWindowsClipboard*
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CXWindowsPrimaryScreen::createClipboard(ClipboardID id)
{
CDisplayLock display(this);
return new CXWindowsClipboard(display, m_window, id);
}
void
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CXWindowsPrimaryScreen::onCloseDisplay(Display* display)
{
assert(m_window != None);
// destroy window
if (display != NULL) {
XDestroyWindow(display, m_window);
}
m_window = None;
}
void
CXWindowsPrimaryScreen::onUnexpectedClose()
{
// tell server to shutdown
m_server->onError();
}
void
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CXWindowsPrimaryScreen::onLostClipboard(ClipboardID id)
{
// tell server that the clipboard was grabbed locally
m_server->onGrabClipboard("", id, 0);
}
void
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CXWindowsPrimaryScreen::selectEvents(Display* display, Window w) const
{
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// ignore errors while we adjust event masks. windows could be
// destroyed at any time after the XQueryTree() in doSelectEvents()
// so we must ignore BadWindow errors.
CXWindowsUtil::CErrorLock lock(display);
// adjust event masks
doSelectEvents(display, w);
}
void
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CXWindowsPrimaryScreen::doSelectEvents(Display* display, Window w) const
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{
// we want to track the mouse everywhere on the display. to achieve
// that we select PointerMotionMask on every window. we also select
// SubstructureNotifyMask in order to get CreateNotify events so we
// select events on new windows too.
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//
// note that this can break certain clients due a design flaw of X.
// X will deliver a PointerMotion event to the deepest window in the
// hierarchy that contains the pointer and has PointerMotionMask
// selected by *any* client. if another client doesn't select
// motion events in a subwindow so the parent window will get them
// then by selecting for motion events on the subwindow we break
// that client because the parent will no longer get the events.
// FIXME -- should provide some workaround for event selection
// design flaw. perhaps only select for motion events on windows
// that already do or are top-level windows or don't propagate
// pointer events. or maybe an option to simply poll the mouse.
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// we don't want to adjust our grab window
if (w == m_window) {
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return;
}
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// select events of interest. do this before querying the tree so
// we'll get notifications of children created after the XQueryTree()
// so we won't miss them.
XSelectInput(display, w, PointerMotionMask | SubstructureNotifyMask);
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// recurse on child windows
Window rw, pw, *cw;
unsigned int nc;
if (XQueryTree(display, w, &rw, &pw, &cw, &nc)) {
for (unsigned int i = 0; i < nc; ++i) {
doSelectEvents(display, cw[i]);
}
XFree(cw);
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}
}
KeyModifierMask
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CXWindowsPrimaryScreen::mapModifier(unsigned int state) const
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{
// FIXME -- should be configurable
KeyModifierMask mask = 0;
if (state & ShiftMask)
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mask |= KeyModifierShift;
if (state & LockMask)
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mask |= KeyModifierCapsLock;
if (state & ControlMask)
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mask |= KeyModifierControl;
if (state & Mod1Mask)
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mask |= KeyModifierAlt;
if (state & Mod2Mask)
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mask |= KeyModifierNumLock;
if (state & Mod4Mask)
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mask |= KeyModifierMeta;
if (state & Mod5Mask)
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mask |= KeyModifierScrollLock;
return mask;
}
KeyID
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CXWindowsPrimaryScreen::mapKey(XKeyEvent* event) const
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{
KeySym keysym;
char dummy[1];
CDisplayLock display(this);
XLookupString(event, dummy, 0, &keysym, NULL);
return static_cast<KeyID>(keysym);
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}
ButtonID
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CXWindowsPrimaryScreen::mapButton(unsigned int button) const
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{
// FIXME -- should use button mapping?
if (button >= 1 && button <= 3) {
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return static_cast<ButtonID>(button);
}
else {
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return kButtonNone;
}
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}
void
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CXWindowsPrimaryScreen::updateModifierMap(Display* display)
{
// get modifier map from server
XModifierKeymap* keymap = XGetModifierMapping(display);
// initialize
m_numLockMask = 0;
m_capsLockMask = 0;
m_scrollLockMask = 0;
// set keycodes and masks
for (unsigned int i = 0; i < 8; ++i) {
const unsigned int bit = (1 << i);
for (int j = 0; j < keymap->max_keypermod; ++j) {
KeyCode keycode = keymap->modifiermap[i *
keymap->max_keypermod + j];
// note toggle modifier bits
const KeySym keysym = XKeycodeToKeysym(display, keycode, 0);
if (keysym == XK_Num_Lock) {
m_numLockMask |= bit;
}
else if (keysym == XK_Caps_Lock) {
m_capsLockMask |= bit;
}
else if (keysym == XK_Scroll_Lock) {
m_scrollLockMask |= bit;
}
}
}
XFreeModifiermap(keymap);
}
Bool
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CXWindowsPrimaryScreen::findKeyEvent(Display*, XEvent* xevent, XPointer arg)
{
CKeyEventInfo* filter = reinterpret_cast<CKeyEventInfo*>(arg);
return (xevent->type == filter->m_event &&
xevent->xkey.window == filter->m_window &&
xevent->xkey.time == filter->m_time &&
xevent->xkey.keycode == filter->m_keycode) ? True : False;
}