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barrier/lib/server/CXWindowsPrimaryScreen.cpp

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/*
* synergy -- mouse and keyboard sharing utility
* Copyright (C) 2002 Chris Schoeneman
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* found in the file COPYING that should have accompanied this file.
*
* This package is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "CXWindowsPrimaryScreen.h"
#include "CXWindowsScreen.h"
#include "CXWindowsUtil.h"
#include "IPrimaryScreenReceiver.h"
#include "XScreen.h"
#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
# define XK_XKB_KEYS
# include <X11/keysymdef.h>
#endif
//
// CXWindowsPrimaryScreen
//
CXWindowsPrimaryScreen::CXWindowsPrimaryScreen(
IScreenReceiver* receiver,
IPrimaryScreenReceiver* primaryReceiver) :
CPrimaryScreen(receiver),
m_receiver(primaryReceiver),
m_window(None)
{
m_screen = new CXWindowsScreen(receiver, this);
}
CXWindowsPrimaryScreen::~CXWindowsPrimaryScreen()
{
assert(m_window == None);
delete m_screen;
}
void
CXWindowsPrimaryScreen::reconfigure(UInt32)
{
// do nothing
}
void
CXWindowsPrimaryScreen::warpCursor(SInt32 x, SInt32 y)
{
CDisplayLock display(m_screen);
// warp mouse
warpCursorNoFlush(display, x, y);
// remove all input events before and including warp
XEvent event;
while (XCheckMaskEvent(display, PointerMotionMask |
ButtonPressMask | ButtonReleaseMask |
KeyPressMask | KeyReleaseMask |
KeymapStateMask,
&event)) {
// do nothing
}
// save position as last position
m_x = x;
m_y = y;
}
KeyModifierMask
CXWindowsPrimaryScreen::getToggleMask() const
{
CDisplayLock display(m_screen);
// query the pointer to get the keyboard state
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(m_screen);
// 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) {
// if any key is half-duplex then it'll be down when
// toggled on but shouldn't count as a reason to lock
// to the screen.
if (m_numLockHalfDuplex || m_capsLockHalfDuplex) {
for (unsigned int j = 0; j < 8; ++j) {
if ((keyMap[i] & (1 << j)) != 0) {
const KeyCode keycode = 8 * i + j;
const KeySym keysym = XKeycodeToKeysym(display,
keycode, 0);
if (m_numLockHalfDuplex && keysym == XK_Num_Lock) {
continue;
}
if (m_capsLockHalfDuplex && keysym == XK_Caps_Lock) {
continue;
}
// non-half-duplex key down
return true;
}
}
// only half-duplex keys down
continue;
}
return true;
}
}
// not locked
return false;
}
IScreen*
CXWindowsPrimaryScreen::getScreen() const
{
return m_screen;
}
void
CXWindowsPrimaryScreen::onScreensaver(bool activated)
{
m_receiver->onScreensaver(activated);
}
bool
CXWindowsPrimaryScreen::onPreDispatch(const CEvent*)
{
return false;
}
bool
CXWindowsPrimaryScreen::onEvent(CEvent* event)
{
assert(event != NULL);
XEvent& xevent = event->m_event;
// handle event
switch (xevent.type) {
case CreateNotify:
{
// select events on new window
CDisplayLock display(m_screen);
selectEvents(display, xevent.xcreatewindow.window);
}
return true;
case MappingNotify:
// keyboard mapping changed
updateKeys();
return true;
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_receiver->onKeyDown(key, mask);
if (key == kKeyCapsLock && m_capsLockHalfDuplex) {
m_receiver->onKeyUp(key, mask | KeyModifierCapsLock);
}
else if (key == kKeyNumLock && m_numLockHalfDuplex) {
m_receiver->onKeyUp(key, mask | KeyModifierNumLock);
}
}
}
return true;
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
bool hasPress;
{
XEvent xevent2;
CDisplayLock display(m_screen);
hasPress = (XCheckIfEvent(display, &xevent2,
&CXWindowsPrimaryScreen::findKeyEvent,
(XPointer)&filter) == True);
}
if (!hasPress) {
// 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 == kKeyCapsLock && m_capsLockHalfDuplex) {
m_receiver->onKeyDown(key, mask);
}
else if (key == kKeyNumLock && m_numLockHalfDuplex) {
m_receiver->onKeyDown(key, mask);
}
m_receiver->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_receiver->onKeyRepeat(key, mask, 1);
}
}
}
return true;
case ButtonPress:
{
LOG((CLOG_DEBUG1 "event: ButtonPress button=%d", xevent.xbutton.button));
const ButtonID button = mapButton(xevent.xbutton.button);
if (button != kButtonNone) {
m_receiver->onMouseDown(button);
}
}
return true;
case ButtonRelease:
{
LOG((CLOG_DEBUG1 "event: ButtonRelease button=%d", xevent.xbutton.button));
const ButtonID button = mapButton(xevent.xbutton.button);
if (button != kButtonNone) {
m_receiver->onMouseUp(button);
}
else if (xevent.xbutton.button == 4) {
// wheel forward (away from user)
m_receiver->onMouseWheel(120);
}
else if (xevent.xbutton.button == 5) {
// wheel backward (toward user)
m_receiver->onMouseWheel(-120);
}
}
return true;
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
// warpCursorNoFlush() for where the events are
// sent. we discard the matching sent event and
// can be sure we've skipped the warp event.
CDisplayLock display(m_screen);
do {
XMaskEvent(display, PointerMotionMask, &xevent);
} while (!xevent.xmotion.send_event);
}
else if (!isActive()) {
// motion on primary screen
m_receiver->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(m_screen);
warpCursorNoFlush(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_receiver->onMouseMoveSecondary(x, y);
}
}
}
return true;
}
return false;
}
SInt32
CXWindowsPrimaryScreen::getJumpZoneSize() const
{
return 1;
}
void
CXWindowsPrimaryScreen::onPreMainLoop()
{
assert(m_window != None);
}
void
CXWindowsPrimaryScreen::onPreOpen()
{
assert(m_window == None);
}
void
CXWindowsPrimaryScreen::onPostOpen()
{
// get cursor info
m_screen->getCursorPos(m_x, m_y);
m_screen->getCursorCenter(m_xCenter, m_yCenter);
// check for peculiarities
// FIXME -- may have to get these from some database
m_numLockHalfDuplex = false;
m_capsLockHalfDuplex = false;
// m_numLockHalfDuplex = true;
// m_capsLockHalfDuplex = true;
}
void
CXWindowsPrimaryScreen::onPreEnter()
{
assert(m_window != None);
}
void
CXWindowsPrimaryScreen::onPreLeave()
{
assert(m_window != None);
}
void
CXWindowsPrimaryScreen::onEnterScreenSaver()
{
CDisplayLock display(m_screen);
// set keyboard focus to root window. the screensaver should then
// pick up key events for when the user enters a password to unlock.
XSetInputFocus(display, PointerRoot, PointerRoot, CurrentTime);
}
void
CXWindowsPrimaryScreen::createWindow()
{
assert(m_window == None);
// get size of screen
SInt32 x, y, w, h;
m_screen->getShape(x, y, w, h);
// grab window attributes. this window is used to capture user
// input when the user is focused on another client. don't let
// the window manager mess with it.
XSetWindowAttributes attr;
attr.event_mask = PointerMotionMask |
ButtonPressMask | ButtonReleaseMask |
KeyPressMask | KeyReleaseMask |
KeymapStateMask | PropertyChangeMask;
attr.do_not_propagate_mask = 0;
attr.override_redirect = True;
attr.cursor = m_screen->getBlankCursor();
{
// create the grab window
CDisplayLock display(m_screen);
m_window = XCreateWindow(display, m_screen->getRoot(),
x, y, w, h, 0, 0,
InputOnly, CopyFromParent,
CWDontPropagate | CWEventMask |
CWOverrideRedirect | CWCursor,
&attr);
if (m_window == None) {
throw XScreenOpenFailure();
}
LOG((CLOG_DEBUG "window is 0x%08x", m_window));
// start watching for events on other windows
selectEvents(display, m_screen->getRoot());
}
// tell generic screen about the window
m_screen->setWindow(m_window);
}
void
CXWindowsPrimaryScreen::destroyWindow()
{
// display can be NULL if the server unexpectedly disconnected
if (m_window != None) {
m_screen->setWindow(None);
CDisplayLock display(m_screen);
if (display != NULL) {
XDestroyWindow(display, m_window);
}
m_window = None;
}
}
bool
CXWindowsPrimaryScreen::showWindow()
{
assert(m_window != None);
CDisplayLock display(m_screen);
// raise and show the input window
XMapRaised(display, m_window);
// 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;
int result;
CStopwatch timer;
do {
// keyboard first
do {
result = XGrabKeyboard(display, m_window, True,
GrabModeAsync, GrabModeAsync, CurrentTime);
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;
}
}
} while (result != GrabSuccess);
LOG((CLOG_DEBUG2 "grabbed keyboard"));
// now the mouse
result = XGrabPointer(display, m_window, True, 0,
GrabModeAsync, GrabModeAsync,
m_window, None, CurrentTime);
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;
}
}
} while (result != GrabSuccess);
LOG((CLOG_DEBUG1 "grabbed pointer and keyboard"));
return true;
}
void
CXWindowsPrimaryScreen::hideWindow()
{
CDisplayLock display(m_screen);
// unmap the grab window. this also ungrabs the mouse and keyboard.
XUnmapWindow(display, m_window);
}
void
CXWindowsPrimaryScreen::warpCursorToCenter()
{
warpCursor(m_xCenter, m_yCenter);
}
void
CXWindowsPrimaryScreen::warpCursorNoFlush(
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 = m_screen->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, m_screen->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
CXWindowsPrimaryScreen::selectEvents(Display* display, Window w) const
{
// 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
CXWindowsPrimaryScreen::doSelectEvents(Display* display, Window w) const
{
// 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.
//
// 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.
// we don't want to adjust our grab window
if (w == m_window) {
return;
}
// 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);
// 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);
}
}
KeyModifierMask
CXWindowsPrimaryScreen::mapModifier(unsigned int state) const
{
KeyModifierMask mask = 0;
if (state & ShiftMask)
mask |= KeyModifierShift;
if (state & LockMask)
mask |= KeyModifierCapsLock;
if (state & ControlMask)
mask |= KeyModifierControl;
if (state & m_altMask)
mask |= KeyModifierAlt;
if (state & m_metaMask)
mask |= KeyModifierMeta;
if (state & m_superMask)
mask |= KeyModifierSuper;
if (state & m_modeSwitchMask)
mask |= KeyModifierModeSwitch;
if (state & m_numLockMask)
mask |= KeyModifierNumLock;
if (state & m_scrollLockMask)
mask |= KeyModifierScrollLock;
return mask;
}
KeyID
CXWindowsPrimaryScreen::mapKey(XKeyEvent* event) const
{
CDisplayLock display(m_screen);
// convert to a keysym
// FIXME -- we're not properly handling unicode
KeySym keysym;
char dummy[1];
XLookupString(event, dummy, 0, &keysym, NULL);
// convert key
switch (keysym & 0xffffff00) {
case 0x0000:
// Latin-1
return static_cast<KeyID>(keysym);
case 0xfe00:
// ISO 9995 Function and Modifier Keys
if (keysym == XK_ISO_Left_Tab) {
return kKeyLeftTab;
}
return kKeyNone;
case 0xff00:
// MISCELLANY
return static_cast<KeyID>(keysym - 0xff00 + 0xef00);
default:
// FIXME -- support unicode characters
return kKeyNone;
}
}
ButtonID
CXWindowsPrimaryScreen::mapButton(unsigned int button) const
{
// FIXME -- should use button mapping?
if (button >= 1 && button <= 3) {
return static_cast<ButtonID>(button);
}
else {
return kButtonNone;
}
}
void
CXWindowsPrimaryScreen::updateKeys()
{
CDisplayLock display(m_screen);
// get modifier map from server
XModifierKeymap* keymap = XGetModifierMapping(display);
// initialize
m_altMask = 0;
m_metaMask = 0;
m_superMask = 0;
m_modeSwitchMask = 0;
m_numLockMask = 0;
m_capsLockMask = 0;
m_scrollLockMask = 0;
// work around for my system, which reports this state bit when
// mode switch is down, instead of the appropriate modifier bit.
// should have no effect on other systems. -crs 9/02.
m_modeSwitchMask |= (1 << 13);
// 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 mask for particular modifiers
const KeySym keysym = XKeycodeToKeysym(display, keycode, 0);
switch (keysym) {
case XK_Alt_L:
case XK_Alt_R:
m_altMask |= bit;
break;
case XK_Meta_L:
case XK_Meta_R:
m_metaMask |= bit;
break;
case XK_Super_L:
case XK_Super_R:
m_superMask |= bit;
break;
case XK_Mode_switch:
m_modeSwitchMask |= bit;
break;
case XK_Num_Lock:
m_numLockMask |= bit;
break;
case XK_Caps_Lock:
m_capsLockMask |= bit;
break;
case XK_Scroll_Lock:
m_scrollLockMask |= bit;
break;
}
}
}
XFreeModifiermap(keymap);
}
Bool
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;
}
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