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barrier/synergy/CXWindowsScreen.cpp

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#include "CXWindowsScreen.h"
#include "CThread.h"
#include "CLock.h"
#include "TMethodJob.h"
#include "CLog.h"
#include "CString.h"
#include "CStopwatch.h"
#include <string.h>
#include <assert.h>
#include <X11/X.h>
#include <X11/Xatom.h>
#include <set>
//
// CXWindowsScreen
//
static const UInt32 kMaxRequestSize = 4096;
CXWindowsScreen::CXWindowsScreen() :
m_display(NULL),
m_root(None),
m_w(0), m_h(0),
m_stop(false)
{
// do nothing
}
CXWindowsScreen::~CXWindowsScreen()
{
assert(m_display == NULL);
}
void CXWindowsScreen::openDisplay()
{
assert(m_display == NULL);
// open the display
log((CLOG_DEBUG "XOpenDisplay(%s)", "NULL"));
m_display = XOpenDisplay(NULL); // FIXME -- allow non-default
if (m_display == NULL)
throw int(5); // FIXME -- make exception for this
// get default screen
m_screen = DefaultScreen(m_display);
Screen* screen = ScreenOfDisplay(m_display, m_screen);
// get screen size
m_w = WidthOfScreen(screen);
m_h = HeightOfScreen(screen);
log((CLOG_INFO "display size: %dx%d", m_w, m_h));
// get the root window
m_root = RootWindow(m_display, m_screen);
// get some atoms
m_atomTargets = XInternAtom(m_display, "TARGETS", False);
m_atomMultiple = XInternAtom(m_display, "MULTIPLE", False);
m_atomTimestamp = XInternAtom(m_display, "TIMESTAMP", False);
m_atomAtom = XInternAtom(m_display, "ATOM", False);
m_atomAtomPair = XInternAtom(m_display, "ATOM_PAIR", False);
m_atomInteger = XInternAtom(m_display, "INTEGER", False);
m_atomData = XInternAtom(m_display, "DESTINATION", False);
m_atomINCR = XInternAtom(m_display, "INCR", False);
m_atomString = XInternAtom(m_display, "STRING", False);
m_atomText = XInternAtom(m_display, "TEXT", False);
m_atomCompoundText = XInternAtom(m_display, "COMPOUND_TEXT", False);
m_atomSynergyTime = XInternAtom(m_display, "SYNERGY_TIME", False);
// clipboard atoms
m_atomClipboard[kClipboardClipboard] =
XInternAtom(m_display, "CLIPBOARD", False);
m_atomClipboard[kClipboardSelection] = XA_PRIMARY;
// let subclass prep display
onOpenDisplay();
}
void CXWindowsScreen::closeDisplay()
{
assert(m_display != NULL);
// let subclass close down display
onCloseDisplay();
// clear out the clipboard request lists
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
CClipboardInfo& clipboard = m_clipboards[id];
for (CRequestMap::iterator index = clipboard.m_requests.begin();
index != clipboard.m_requests.end(); ++index) {
CRequestList* list = index->second;
for (CRequestList::iterator index2 = list->begin();
index2 != list->end(); ++index2) {
delete *index2;
}
delete list;
}
clipboard.m_requests.clear();
}
// close the display
XCloseDisplay(m_display);
m_display = NULL;
log((CLOG_DEBUG "closed display"));
}
int CXWindowsScreen::getScreen() const
{
assert(m_display != NULL);
return m_screen;
}
Window CXWindowsScreen::getRoot() const
{
assert(m_display != NULL);
return m_root;
}
void CXWindowsScreen::getScreenSize(
SInt32* w, SInt32* h) const
{
assert(m_display != NULL);
assert(w != NULL && h != NULL);
*w = m_w;
*h = m_h;
}
Cursor CXWindowsScreen::createBlankCursor() const
{
// this seems just a bit more complicated than really necessary
// get the closet cursor size to 1x1
unsigned int w, h;
XQueryBestCursor(m_display, m_root, 1, 1, &w, &h);
// make bitmap data for cursor of closet size. since the cursor
// is blank we can use the same bitmap for shape and mask: all
// zeros.
const int size = ((w + 7) >> 3) * h;
char* data = new char[size];
memset(data, 0, size);
// make bitmap
Pixmap bitmap = XCreateBitmapFromData(m_display, m_root, data, w, h);
// need an arbitrary color for the cursor
XColor color;
color.pixel = 0;
color.red = color.green = color.blue = 0;
color.flags = DoRed | DoGreen | DoBlue;
// make cursor from bitmap
Cursor cursor = XCreatePixmapCursor(m_display, bitmap, bitmap,
&color, &color, 0, 0);
// don't need bitmap or the data anymore
delete[] data;
XFreePixmap(m_display, bitmap);
return cursor;
}
bool CXWindowsScreen::getEvent(XEvent* xevent) const
{
// wait for an event in a cancellable way and don't lock the
// display while we're waiting.
m_mutex.lock();
while (!m_stop && XPending(m_display) == 0) {
m_mutex.unlock();
CThread::sleep(0.05);
m_mutex.lock();
}
if (m_stop) {
m_mutex.unlock();
return false;
}
else {
XNextEvent(m_display, xevent);
m_mutex.unlock();
return true;
}
}
void CXWindowsScreen::doStop()
{
CLock lock(&m_mutex);
m_stop = true;
}
ClipboardID CXWindowsScreen::getClipboardID(Atom selection)
{
for (ClipboardID id = 0; id < kClipboardEnd; ++id)
if (selection == m_atomClipboard[id])
return id;
return kClipboardEnd;
}
bool CXWindowsScreen::lostClipboard(
Atom selection, Time timestamp)
{
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
if (selection == m_atomClipboard[id]) {
// note the time
CLock lock(&m_mutex);
m_clipboards[id].m_lostClipboard = timestamp;
log((CLOG_INFO "lost clipboard %d ownership at %d", id, timestamp));
return true;
}
}
return false;
}
bool CXWindowsScreen::setDisplayClipboard(
ClipboardID id,
const IClipboard* clipboard,
Window requestor, Time timestamp)
{
CLock lock(&m_mutex);
XSetSelectionOwner(m_display, m_atomClipboard[id], requestor, timestamp);
if (XGetSelectionOwner(m_display, m_atomClipboard[id]) == requestor) {
// we got the selection
log((CLOG_INFO "grabbed clipboard at %d", timestamp));
m_clipboards[id].m_lostClipboard = CurrentTime;
if (clipboard != NULL) {
// save clipboard to serve requests
CClipboard::copy(&m_clipboards[id].m_clipboard,
clipboard, timestamp);
}
else {
// clear clipboard
if (m_clipboards[id].m_clipboard.open(timestamp)) {
m_clipboards[id].m_clipboard.close();
}
}
return true;
}
return false;
}
void CXWindowsScreen::getDisplayClipboard(
ClipboardID id,
IClipboard* clipboard,
Window requestor, Time timestamp) const
{
assert(clipboard != NULL);
assert(requestor != None);
// FIXME -- don't update clipboard object if clipboard hasn't changed
// clear the clipboard object
if (!clipboard->open(timestamp))
return;
// block others from using the display while we get the clipboard.
// in particular, this prevents the event thread from stealing the
// selection notify event we're expecting.
CLock lock(&m_mutex);
Atom selection = m_atomClipboard[id];
// ask the selection for all the formats it has. some owners return
// the TARGETS atom and some the ATOM atom when TARGETS is requested.
Atom format;
CString targets;
if (getDisplayClipboard(selection, m_atomTargets,
requestor, timestamp, &format, &targets) &&
(format == m_atomTargets || format == XA_ATOM)) {
// get each target (that we can interpret). some owners return
// some targets multiple times in the list so don't try to get
// those multiple times.
const Atom* targetAtoms = reinterpret_cast<const Atom*>(targets.data());
const SInt32 numTargets = targets.size() / sizeof(Atom);
std::set<IClipboard::EFormat> clipboardFormats;
std::set<Atom> targets;
log((CLOG_INFO "getting selection %d with %d targets", id, numTargets));
for (SInt32 i = 0; i < numTargets; ++i) {
Atom format = targetAtoms[i];
log((CLOG_DEBUG1 " source target %d", format));
// skip already handled targets
if (targets.count(format) > 0) {
log((CLOG_DEBUG1 " skipping handled target %d", format));
continue;
}
// mark this target as done
targets.insert(format);
// determine the expected clipboard format
IClipboard::EFormat expectedFormat = getFormat(format);
// if we can use the format and we haven't already retrieved
// it then get it
if (expectedFormat == IClipboard::kNumFormats) {
log((CLOG_DEBUG1 " no format for target", format));
continue;
}
if (clipboardFormats.count(expectedFormat) > 0) {
log((CLOG_DEBUG1 " skipping handled format %d", expectedFormat));
continue;
}
CString data;
if (!getDisplayClipboard(selection, format,
requestor, timestamp, &format, &data)) {
log((CLOG_DEBUG1 " no data for target", format));
continue;
}
// use the actual format, not the expected
IClipboard::EFormat actualFormat = getFormat(format);
if (actualFormat == IClipboard::kNumFormats) {
log((CLOG_DEBUG1 " no format for target", format));
continue;
}
if (clipboardFormats.count(actualFormat) > 0) {
log((CLOG_DEBUG1 " skipping handled format %d", actualFormat));
continue;
}
// add to clipboard and note we've done it
clipboard->add(actualFormat, data);
clipboardFormats.insert(actualFormat);
log((CLOG_INFO " added format %d for target %d", actualFormat, format));
}
}
else {
// non-ICCCM conforming selection owner. try TEXT format.
// FIXME
log((CLOG_DEBUG1 "selection doesn't support TARGETS, format is %d", format));
}
// done with clipboard
clipboard->close();
}
bool CXWindowsScreen::getDisplayClipboard(
Atom selection, Atom type,
Window requestor, Time timestamp,
Atom* outputType, CString* outputData) const
{
assert(outputType != NULL);
assert(outputData != NULL);
// FIXME -- this doesn't work to retrieve Motif selections.
// delete data property
XDeleteProperty(m_display, requestor, m_atomData);
// request data conversion
XConvertSelection(m_display, selection, type,
m_atomData, requestor, timestamp);
// wait for the selection notify event. can't just mask out other
// events because X stupidly doesn't provide a mask for selection
// events, so we use a predicate to find our event. we also set
// a time limit for a response so we're not screwed by a bad
// clipboard owner.
CStopwatch timer(true);
XEvent xevent;
while (XCheckIfEvent(m_display, &xevent,
&CXWindowsScreen::findSelectionNotify,
(XPointer)&requestor) != True) {
// return false if we've timed-out
if (timer.getTime() >= 1.0)
return false;
// wait a bit
CThread::sleep(0.05);
}
assert(xevent.type == SelectionNotify);
assert(xevent.xselection.requestor == requestor);
// make sure the transfer worked
Atom property = xevent.xselection.property;
if (property == None) {
// cannot convert
*outputType = type;
log((CLOG_DEBUG "selection conversion failed for %d", type));
return false;
}
// get the data and discard the property
SInt32 datumSize;
CString data;
bool okay = getData(requestor, property, outputType, &datumSize, &data);
XDeleteProperty(m_display, requestor, property);
// fail if we couldn't get the data
if (!okay) {
log((CLOG_DEBUG "can't get data for selection format %d", type));
return false;
}
// handle INCR type specially. it means we'll be receiving the data
// piecemeal so we just loop until we've collected all the data.
if (*outputType == m_atomINCR) {
log((CLOG_DEBUG1 "selection data for format %d is incremental", type));
// the data is a lower bound on the amount of data to be
// transferred. use it as a hint to size our buffer.
UInt32 size;
switch (datumSize) {
case 8:
size = *(reinterpret_cast<const UInt8*>(data.data()));
break;
case 16:
size = *(reinterpret_cast<const UInt16*>(data.data()));
break;
case 32:
size = *(reinterpret_cast<const UInt32*>(data.data()));
break;
default:
assert(0 && "invalid datum size");
}
// empty the buffer and reserve the lower bound
data.erase();
data.reserve(size);
// look for property notify events with the following
CPropertyNotifyInfo filter;
filter.m_window = requestor;
filter.m_property = property;
// now enter the INCR loop
bool error = false;
*outputType = (Atom)0;
for (;;) {
// wait for more data
while (XCheckIfEvent(m_display, &xevent,
&CXWindowsScreen::findPropertyNotify,
(XPointer)&filter) != True) {
// wait a bit
CThread::sleep(0.05);
}
assert(xevent.type == PropertyNotify);
assert(xevent.xproperty.window == requestor);
assert(xevent.xproperty.atom == property);
// get the additional data then delete the property to
// ask the clipboard owner for the next chunk.
Atom newType;
CString newData;
okay = getData(requestor, property, &newType, NULL, &newData);
XDeleteProperty(m_display, requestor, property);
// transfer has failed if we can't get the data
if (!okay)
error = true;
// a zero length property means we got the last chunk
if (newData.size() == 0)
break;
// if this is the first chunk then save the type. otherwise
// note that the new type is the same as the first chunk's
// type. if they're not the the clipboard owner is busted
// but we have to continue the transfer because there's no
// way to cancel it.
if (*outputType == (Atom)0)
*outputType = newType;
else if (*outputType != newType)
error = true;
// append the data
data += newData;
}
// if there was an error we could say the transferred failed
// but we'll be liberal in what we accept.
if (error) {
log((CLOG_WARN "ICCCM violation by clipboard owner"));
// return false;
}
}
*outputData = data;
return true;
}
bool CXWindowsScreen::getData(
Window window, Atom property,
Atom* type, SInt32* datumSize,
CString* data) const
{
assert(type != NULL);
assert(data != NULL);
// clear out any existing data
data->erase();
// read the property
long offset = 0;
long length = 8192 / 4;
for (;;) {
// get more data
int actualDatumSize;
unsigned long numItems, bytesLeft;
unsigned char* rawData;
const int result = XGetWindowProperty(m_display, window, property,
offset, length, False, AnyPropertyType,
type, &actualDatumSize,
&numItems, &bytesLeft,
&rawData);
if (result != Success) {
// failed
return false;
}
// save datum size
if (datumSize != NULL)
*datumSize = (SInt32)actualDatumSize;
const SInt32 bytesPerDatum = (SInt32)actualDatumSize / 8;
// advance read pointer. since we can only read at offsets that
// are multiples of 4 byte we take care to write multiples of 4
// bytes to data, except when we've retrieved the last chunk.
SInt32 quadCount = (numItems * bytesPerDatum) / 4;
offset += quadCount;
// append data
if (bytesLeft == 0)
data->append((char*)rawData, bytesPerDatum * numItems);
else
data->append((char*)rawData, 4 * quadCount);
// done with returned data
XFree(rawData);
// done if no data is left
if (bytesLeft == 0)
return true;
}
}
IClipboard::EFormat CXWindowsScreen::getFormat(Atom src) const
{
// FIXME -- handle more formats (especially mime-type-like formats
// and various character encodings like unicode).
if (src == XA_STRING ||
src == m_atomText ||
src == m_atomCompoundText)
return IClipboard::kText;
return IClipboard::kNumFormats;
}
Bool CXWindowsScreen::findSelectionNotify(
Display*, XEvent* xevent, XPointer arg)
{
Window requestor = *reinterpret_cast<Window*>(arg);
return (xevent->type == SelectionNotify &&
xevent->xselection.requestor == requestor) ? True : False;
}
Bool CXWindowsScreen::findPropertyNotify(
Display*, XEvent* xevent, XPointer arg)
{
CPropertyNotifyInfo* filter = reinterpret_cast<CPropertyNotifyInfo*>(arg);
return (xevent->type == PropertyNotify &&
xevent->xproperty.window == filter->m_window &&
xevent->xproperty.atom == filter->m_property &&
xevent->xproperty.state == PropertyNewValue) ? True : False;
}
void CXWindowsScreen::addClipboardRequest(
Window owner, Window requestor,
Atom selection, Atom target,
Atom property, Time time)
{
bool success = false;
// see if it's a selection we know about
ClipboardID id;
for (id = 0; id < kClipboardEnd; ++id)
if (selection == m_atomClipboard[id])
break;
// mutex the display
CLock lock(&m_mutex);
// a request for multiple targets is special
if (id != kClipboardEnd) {
// check time we own the selection against the requested time
if (!wasOwnedAtTime(id, owner, time)) {
// fail for time we didn't own selection
}
else if (target == m_atomMultiple) {
// add a multiple request
if (property != None) {
success = sendClipboardMultiple(id, requestor, property, time);
}
}
else {
// handle remaining request formats
success = sendClipboardData(id, requestor, target, property, time);
}
}
// send success or failure
sendNotify(requestor, selection, target, success ? property : None, time);
}
void CXWindowsScreen::processClipboardRequest(
Window requestor,
Atom property, Time /*time*/)
{
CLock lock(&m_mutex);
// check every clipboard
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
CClipboardInfo& clipboard = m_clipboards[id];
// find the request list
CRequestMap::iterator index = clipboard.m_requests.find(requestor);
if (index == clipboard.m_requests.end()) {
// this clipboard isn't servicing this requestor window
continue;
}
CRequestList* list = index->second;
assert(list != NULL);
// find the property in the list
CRequestList::iterator index2;
for (index2 = list->begin(); index2 != list->end(); ++index2) {
if ((*index2)->m_property == property) {
break;
}
}
if (index2 == list->end()) {
// this clipboard isn't waiting on this property
continue;
}
CClipboardRequest* request = *index2;
assert(request != NULL);
// compute amount of data to send
assert(request->m_sent <= request->m_data.size());
UInt32 count = request->m_data.size() - request->m_sent;
if (count > kMaxRequestSize) {
// limit maximum chunk size
count = kMaxRequestSize;
// make it a multiple of the size
count &= ~((request->m_size >> 3) - 1);
}
// send more data
// FIXME -- handle Alloc errors (by returning false)
XChangeProperty(m_display, request->m_requestor, request->m_property,
request->m_type, request->m_size,
PropModeReplace,
reinterpret_cast<const unsigned char*>(
request->m_data.data() + request->m_sent),
count / (request->m_size >> 3));
// account for sent data
request->m_sent += count;
// if we sent zero bytes then we're done sending this data. remove
// it from the list and, if the list is empty, the list from the
// map. also stop watching the requestor for events.
if (count == 0) {
list->erase(index2);
delete request;
if (list->empty()) {
clipboard.m_requests.erase(index);
delete list;
}
XSelectInput(m_display, requestor, NoEventMask);
}
// request has been serviced
break;
}
}
void CXWindowsScreen::destroyClipboardRequest(
Window requestor)
{
CLock lock(&m_mutex);
// check every clipboard
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
CClipboardInfo& clipboard = m_clipboards[id];
// find the request list
CRequestMap::iterator index = clipboard.m_requests.find(requestor);
if (index == clipboard.m_requests.end()) {
continue;
}
CRequestList* list = index->second;
assert(list != NULL);
// destroy every request in the list
for (CRequestList::iterator index2 = list->begin();
index2 != list->end(); ++index2) {
delete *index2;
}
// remove and destroy the list
clipboard.m_requests.erase(index);
delete list;
}
// note -- we don't stop watching the window for events because
// we're called in response to the window being destroyed.
}
bool CXWindowsScreen::sendClipboardData(
ClipboardID id,
Window requestor, Atom target,
Atom property, Time time)
{
if (target == m_atomTargets) {
return sendClipboardTargets(id, requestor, property, time);
}
else if (target == m_atomTimestamp) {
return sendClipboardTimestamp(id, requestor, property, time);
}
else {
// compute the type and size for the requested target and
// convert the data from the clipboard.
Atom type = None;
int size = 0;
CString data;
if (target == m_atomText || target == m_atomString) {
if (m_clipboards[id].m_clipboard.has(IClipboard::kText)) {
type = m_atomString;
size = 8;
data = m_clipboards[id].m_clipboard.get(IClipboard::kText);
}
}
// fail if we don't recognize or can't handle the target
if (type == None || size == 0) {
return false;
}
if (data.size() > kMaxRequestSize) {
log((CLOG_DEBUG1 "handling clipboard request for %d as INCR", target));
// get the appropriate list, creating it if necessary
CRequestList* list = m_clipboards[id].m_requests[requestor];
if (list == NULL) {
list = new CRequestList;
m_clipboards[id].m_requests[requestor] = list;
}
// create request object
CClipboardRequest* request = new CClipboardRequest;
request->m_data = data;
request->m_sent = 0;
request->m_requestor = requestor;
request->m_property = property;
request->m_type = type;
request->m_size = size;
// add request to request list
list->push_back(request);
// start watching requestor for property changes and
// destruction
XSelectInput(m_display, requestor, StructureNotifyMask |
PropertyChangeMask);
// FIXME -- handle Alloc errors (by returning false)
// set property to INCR
const UInt32 zero = 0;
XChangeProperty(m_display, requestor, property,
m_atomINCR,
8 * sizeof(zero),
PropModeReplace,
reinterpret_cast<const unsigned char*>(&zero),
1);
}
else {
log((CLOG_DEBUG1 "handling clipboard request for %d", target));
// FIXME -- handle Alloc errors (by returning false)
XChangeProperty(m_display, requestor, property,
type, size,
PropModeReplace,
reinterpret_cast<const unsigned char*>(
data.data()),
data.size() / (size >> 3));
}
return true;
}
return false;
}
bool CXWindowsScreen::sendClipboardMultiple(
ClipboardID id,
Window requestor,
Atom property, Time time)
{
log((CLOG_DEBUG1 "handling clipboard request for MULTIPLE"));
// get the list of requested formats
Atom type;
SInt32 size;
CString data;
if (!getData(requestor, property, &type, &size, &data)) {
type = 0;
}
// we only handle atom pair type
bool success = false;
if (type == m_atomAtomPair) {
// check each format, replacing ones we can't do with None. set
// the property for each to the requested data (for small requests)
// or INCR (for large requests).
bool updated = false;
UInt32 numRequests = data.size() / (2 * sizeof(Atom));
for (UInt32 index = 0; index < numRequests; ++index) {
// get request info
const Atom* request = reinterpret_cast<const Atom*>(data.data());
const Atom target = request[2 * index + 0];
const Atom property = request[2 * index + 1];
// handle target
if (property != None) {
if (!sendClipboardData(id, requestor, target, property, time)) {
// couldn't handle target. change property to None.
const Atom none = None;
data.replace((2 * index + 1) * sizeof(Atom), sizeof(Atom),
reinterpret_cast<const char*>(&none),
sizeof(none));
updated = true;
}
else {
success = true;
}
}
}
// update property if we changed it
if (updated) {
// FIXME -- handle Alloc errors (by returning false)
XChangeProperty(m_display, requestor, property,
m_atomAtomPair,
8 * sizeof(Atom),
PropModeReplace,
reinterpret_cast<const unsigned char*>(
data.data()),
data.length());
}
}
// send notify
sendNotify(requestor, m_atomClipboard[id], m_atomMultiple,
success ? property : None, time);
return success;
}
bool CXWindowsScreen::sendClipboardTargets(
ClipboardID id,
Window requestor,
Atom property, Time /*time*/)
{
log((CLOG_DEBUG1 "handling request for TARGETS"));
// count the number of targets, plus TARGETS and MULTIPLE
SInt32 numTargets = 2;
if (m_clipboards[id].m_clipboard.has(IClipboard::kText)) {
numTargets += 2;
}
// construct response
Atom* response = new Atom[numTargets];
SInt32 count = 0;
response[count++] = m_atomTargets;
response[count++] = m_atomMultiple;
if (m_clipboards[id].m_clipboard.has(IClipboard::kText)) {
response[count++] = m_atomText;
response[count++] = m_atomString;
}
// send response (we assume we can transfer the entire list at once)
// FIXME -- handle Alloc errors (by returning false)
XChangeProperty(m_display, requestor, property,
m_atomAtom,
8 * sizeof(Atom),
PropModeReplace,
reinterpret_cast<unsigned char*>(response),
count);
// done with our response
delete[] response;
return true;
}
bool CXWindowsScreen::sendClipboardTimestamp(
ClipboardID id,
Window requestor,
Atom property, Time /*time*/)
{
log((CLOG_DEBUG1 "handling clipboard request for TIMESTAMP"));
// FIXME -- handle Alloc errors (by returning false)
Time time = m_clipboards[id].m_clipboard.getTime();
XChangeProperty(m_display, requestor, property,
m_atomInteger,
32,
PropModeReplace,
reinterpret_cast<unsigned char*>(time),
1);
return true;
}
void CXWindowsScreen::sendNotify(
Window requestor, Atom selection,
Atom target, Atom property, Time time)
{
XEvent event;
event.xselection.type = SelectionNotify;
event.xselection.display = m_display;
event.xselection.requestor = requestor;
event.xselection.selection = selection;
event.xselection.target = target;
event.xselection.property = property;
event.xselection.time = time;
XSendEvent(m_display, requestor, False, 0, &event);
}
bool CXWindowsScreen::wasOwnedAtTime(
ClipboardID id, Window window, Time time) const
{
const CClipboardInfo& clipboard = m_clipboards[id];
// not owned if we've never owned the selection
if (clipboard.m_clipboard.getTime() == CurrentTime)
return false;
// if time is CurrentTime then return true if we still own the
// selection and false if we do not. else if we still own the
// selection then get the current time, otherwise use
// m_lostClipboard as the end time.
Time lost = clipboard.m_lostClipboard;
if (lost == CurrentTime)
if (time == CurrentTime)
return true;
else
lost = getCurrentTimeNoLock(window);
else
if (time == CurrentTime)
return false;
// compare time to range
Time duration = clipboard.m_lostClipboard - clipboard.m_clipboard.getTime();
Time when = time - clipboard.m_clipboard.getTime();
return (/*when >= 0 &&*/ when < duration);
}
Time CXWindowsScreen::getCurrentTime(Window window) const
{
CLock lock(&m_mutex);
return getCurrentTimeNoLock(window);
}
Time CXWindowsScreen::getCurrentTimeNoLock(
Window window) const
{
// do a zero-length append to get the current time
unsigned char dummy;
XChangeProperty(m_display, window, m_atomSynergyTime,
m_atomInteger, 8,
PropModeAppend,
&dummy, 0);
// look for property notify events with the following
CPropertyNotifyInfo filter;
filter.m_window = window;
filter.m_property = m_atomSynergyTime;
// wait for reply
XEvent xevent;
while (XCheckIfEvent(m_display, &xevent,
&CXWindowsScreen::findPropertyNotify,
(XPointer)&filter) != True) {
// wait a bit
CThread::sleep(0.05);
}
assert(xevent.type == PropertyNotify);
assert(xevent.xproperty.window == window);
assert(xevent.xproperty.atom == m_atomSynergyTime);
return xevent.xproperty.time;
}
//
// CXWindowsScreen::CClipboardInfo
//
CXWindowsScreen::CClipboardInfo::CClipboardInfo() :
m_clipboard(),
m_lostClipboard(CurrentTime),
m_requests()
{
// do nothing
}
//
// CXWindowsScreen::CDisplayLock
//
CXWindowsScreen::CDisplayLock::CDisplayLock(const CXWindowsScreen* screen) :
m_mutex(&screen->m_mutex),
m_display(screen->m_display)
{
assert(m_display != NULL);
m_mutex->lock();
}
CXWindowsScreen::CDisplayLock::~CDisplayLock()
{
m_mutex->unlock();
}
CXWindowsScreen::CDisplayLock::operator Display*() const
{
return m_display;
}
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