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/*
*Copyright (C) 1994-2000 The XFree86 Project, Inc. All Rights Reserved.
*
*Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
*"Software"), to deal in the Software without restriction, including
*without limitation the rights to use, copy, modify, merge, publish,
*distribute, sublicense, and/or sell copies of the Software, and to
*permit persons to whom the Software is furnished to do so, subject to
*the following conditions:
*
*The above copyright notice and this permission notice shall be
*included in all copies or substantial portions of the Software.
*
*THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
*EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
*MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
*NONINFRINGEMENT. IN NO EVENT SHALL THE XFREE86 PROJECT BE LIABLE FOR
*ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
*CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
*WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*Except as contained in this notice, the name of the XFree86 Project
*shall not be used in advertising or otherwise to promote the sale, use
*or other dealings in this Software without prior written authorization
*from the XFree86 Project.
*
* Authors: Dakshinamurthy Karra
* Suhaib M Siddiqi
* Peter Busch
* Harold L Hunt II
*/
#ifdef HAVE_XWIN_CONFIG_H
#include <xwin-config.h>
#endif
#include <X11/Xwindows.h>
#include <X11/X.h>
#include "mouse.h"
/* Handle the mouse wheel */
void
winMouseWheel(int *iTotalDeltaZ, int iDeltaZ, int iButtonUp, int iButtonDown)
{
int button;
/* Do we have any previous delta stored? */
if ((*iTotalDeltaZ > 0 && iDeltaZ > 0)
|| (*iTotalDeltaZ < 0 && iDeltaZ < 0)) {
/* Previous delta and of same sign as current delta */
iDeltaZ += *iTotalDeltaZ;
*iTotalDeltaZ = 0;
}
else {
/*
* Previous delta of different sign, or zero.
* We will set it to zero for either case,
* as blindly setting takes just as much time
* as checking, then setting if necessary :)
*/
*iTotalDeltaZ = 0;
}
/*
* Only process this message if the wheel has moved further than
* WHEEL_DELTA
*/
if (iDeltaZ >= WHEEL_DELTA || (-1 * iDeltaZ) >= WHEEL_DELTA) {
*iTotalDeltaZ = 0;
/* Figure out how many whole deltas of the wheel we have */
iDeltaZ /= WHEEL_DELTA;
}
else {
/*
* Wheel has not moved past WHEEL_DELTA threshold;
* we will store the wheel delta until the threshold
* has been reached.
*/
*iTotalDeltaZ = iDeltaZ;
return;
}
/* Set the button to indicate up or down wheel delta */
if (iDeltaZ > 0) {
button = iButtonUp;
}
else {
button = iButtonDown;
}
/*
* Flip iDeltaZ to positive, if negative,
* because always need to generate a *positive* number of
* button clicks for the Z axis.
*/
if (iDeltaZ < 0) {
iDeltaZ *= -1;
}
/* Generate X input messages for each wheel delta we have seen */
while (iDeltaZ--) {
/* Push the wheel button */
winMouseButtonsSendEvent(TRUE, button);
/* Release the wheel button */
winMouseButtonsSendEvent(FALSE, button);
}
}
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