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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <windows.h>
#include <rfb/LogWriter.h>
#include <rfb_win32/CPointer.h>
using namespace rfb;
using namespace win32;
static LogWriter vlog("CPointer");
CPointer::CPointer() : currButtonMask(0), intervalQueued(false), threeEmulating(false) {
}
CPointer::~CPointer() {
intervalTimer.stop();
threeTimer.stop();
}
void CPointer::pointerEvent(InputHandler* writer, const Point& pos, int buttonMask) {
//
// - Duplicate Event Filtering
//
bool maskChanged = buttonMask != currButtonMask;
bool posChanged = !pos.equals(currPos);
if (!(posChanged || maskChanged))
return;
// Pass on the event to the event-interval handler
threePointerEvent(writer, pos, buttonMask);
// Save the position and mask
currPos = pos;
currButtonMask = buttonMask;
}
inline int _abs(int x) {return x>0 ? x : 0;}
int emulate3Mask(int buttonMask) {
// - Release left & right and press middle
vlog.debug("emulate3: active");
buttonMask &= ~5;
buttonMask |= 2;
return buttonMask;
}
void CPointer::threePointerEvent(InputHandler* writer, const Point& pos, int buttonMask) {
//
// - 3-Button Mouse Emulation
//
if (emulate3) {
bool leftChanged = (buttonMask & 1) != (currButtonMask & 1);
bool rightChanged = (buttonMask & 4) != (currButtonMask & 4);
if (leftChanged || rightChanged) {
// - One of left or right have changed
if ((buttonMask & 5) == 1 || (buttonMask & 5) == 4) {
// - One is up, one is down. Start a timer, so that if it
// expires then we know we should actually send this event
vlog.debug("emulate3: start timer");
threeTimer.start(100);
threePos = pos;
threeMask = buttonMask;
return;
} else if (threeTimer.isActive()) {
// - Both are up or both are down, and we were timing for an emulation event
// Stop the timer and flush the stored event
vlog.debug("emulate3: stop timer (state)");
threeTimer.stop();
if (threeEmulating == ((buttonMask & 5) == 5))
intervalPointerEvent(writer, threePos, threeMask);
else
threeEmulating = ((buttonMask & 5) == 5);
}
} else {
if (threeTimer.isActive()) {
// - We are timing for an emulation event
if (_abs(threePos.x - pos.x) <= 4 || _abs(threePos.y - pos.y) <= 4) {
// If the mouse has moved too far since the button-change event then flush
vlog.debug("emulate3: stop timer (moved)");
threeTimer.stop();
intervalPointerEvent(writer, threePos, threeMask);
} else {
// Otherwise, we ignore the new event
return;
}
}
}
// - If neither left nor right are down, stop emulating
if ((buttonMask & 5) == 0)
threeEmulating = false;
// - If emulating, release left & right and press middle
if (threeEmulating)
buttonMask = emulate3Mask(buttonMask);
}
// - Let the event pass through to the next stage of processing
intervalPointerEvent(writer, pos, buttonMask);
}
void CPointer::intervalPointerEvent(InputHandler* writer, const Point& pos, int buttonMask) {
//
// - Pointer Event Interval
//
vlog.write(101, "ptrEvent: %d,%d (%lx)", pos.x, pos.y, buttonMask);
// Send the event immediately if we haven't sent one for a while
bool sendNow = !intervalTimer.isActive();
if (intervalMask != buttonMask) {
// If the buttons have changed then flush queued events and send now
sendNow = true;
if (intervalQueued)
writer->pointerEvent(intervalPos, intervalMask);
intervalQueued = false;
}
if (!sendNow) {
// If we're not sending now then just queue the event
intervalQueued = true;
intervalPos = pos;
intervalMask = buttonMask;
} else {
// Start the interval timer if required, and send the event
intervalQueued = false;
intervalMask = buttonMask;
if (pointerEventInterval)
intervalTimer.start(pointerEventInterval);
writer->pointerEvent(pos, buttonMask);
}
}
void CPointer::handleTimer(InputHandler* writer, int timerId) {
if (timerId == intervalTimer.getId()) {
// Pointer interval has expired - send any queued events
if (intervalQueued) {
writer->pointerEvent(intervalPos, intervalMask);
intervalQueued = false;
} else {
intervalTimer.stop();
}
} else if (timerId == threeTimer.getId()) {
// 3-Button emulation timer has expired - send what we've got
vlog.debug("emulate3: timeout");
threeTimer.stop();
// If emulating, release left & right and press middle
if (threeEmulating)
threeMask = emulate3Mask(threeMask);
intervalPointerEvent(writer, threePos, threeMask);
}
}
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