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** additional rights. These rights are described in the Trolltech GPL
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** and in the file
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#include "qmouselinuxtp_qws.h"
#ifndef QT_NO_QWS_MOUSE_LINUXTP
#include "qwindowsystem_qws.h"
#include "qsocketnotifier.h"
#include "qtimer.h"
#include "qapplication.h"
#include "qscreen_qws.h"
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#if defined(QT_QWS_IPAQ)
#ifndef QT_QWS_IPAQ_RAW
#define QT_QWS_IPAQ_RAW
#endif
#define QT_QWS_SCREEN_COORDINATES
typedef struct {
unsigned short pressure;
unsigned short x;
unsigned short y;
unsigned short pad;
} TS_EVENT;
#elif defined(QT_QWS_EBX)
#define QT_QWS_EBX_RAW
#define QT_QWS_SCREEN_COORDINATES
#ifndef QT_QWS_SHARP
typedef struct {
unsigned short pressure;
unsigned short x;
unsigned short y;
unsigned short pad;
} TS_EVENT;
#else
typedef struct {
long y;
long x;
long pressure;
long long millisecs;
} TS_EVENT;
#define QT_QWS_TP_SAMPLE_SIZE 10
#define QT_QWS_TP_MINIMUM_SAMPLES 4
#define QT_QWS_TP_PRESSURE_THRESHOLD 500
#define QT_QWS_TP_MOVE_LIMIT 50
#define QT_QWS_TP_JITTER_LIMIT 2
#endif
#else // not IPAQ, not SHARP
typedef struct {
unsigned short pressure;
unsigned short x;
unsigned short y;
unsigned short pad;
} TS_EVENT;
#endif
#ifndef QT_QWS_TP_SAMPLE_SIZE
#define QT_QWS_TP_SAMPLE_SIZE 5
#endif
#ifndef QT_QWS_TP_MINIMUM_SAMPLES //确定每个点的有效样本数
#define QT_QWS_TP_MINIMUM_SAMPLES 5
#endif
#ifndef QT_QWS_TP_PRESSURE_THRESHOLD //压力筏值
#define QT_QWS_TP_PRESSURE_THRESHOLD 1
#endif
#ifndef QT_QWS_TP_MOVE_LIMIT //鼠标移动位置的上限(这里用词不是太准)
#define QT_QWS_TP_MOVE_LIMIT 100
#endif
#ifndef QT_QWS_TP_JITTER_LIMIT //鼠标移动位置的下限(这里用词不是太准)
#define QT_QWS_TP_JITTER_LIMIT 2
#endif
class QWSLinuxTPMouseHandlerPrivate : public QObject
{
Q_OBJECT
public:
QWSLinuxTPMouseHandlerPrivate(QWSLinuxTPMouseHandler *h, const QString &);
~QWSLinuxTPMouseHandlerPrivate();
void suspend();
void resume();
private:
static const int mouseBufSize = 2048;
int mouseFD; //打开触摸屏设备后的文件描述符
QPoint oldmouse; //先前的鼠标位置
QPoint oldTotalMousePos; //先前的鼠标位置累加和
bool waspressed; //先前是否有点击事件发生
QPolygon samples;
int currSample; //当前样本
int lastSample;
int numSamples; //当前有效样本数
int skipCount; //没有处理的鼠标位置的次数
int mouseIdx; //索引
uchar mouseBuf[mouseBufSize]; //用作从mouseFD中读到的数据的缓冲区
QWSLinuxTPMouseHandler *handler;
QSocketNotifier *mouseNotifier;
private slots:
void readMouseData();
};
QWSLinuxTPMouseHandler::QWSLinuxTPMouseHandler(const QString &driver, const QString &device)
: QWSCalibratedMouseHandler(driver, device)
{
d = new QWSLinuxTPMouseHandlerPrivate(this, device);
}
QWSLinuxTPMouseHandler::~QWSLinuxTPMouseHandler()
{
delete d;
}
void QWSLinuxTPMouseHandler::suspend()
{
d->suspend();
}
void QWSLinuxTPMouseHandler::resume()
{
d->resume();
}
QWSLinuxTPMouseHandlerPrivate::QWSLinuxTPMouseHandlerPrivate(QWSLinuxTPMouseHandler *h,
const QString &device)
: samples(QT_QWS_TP_SAMPLE_SIZE), currSample(0), lastSample(0),
numSamples(0), skipCount(0), handler(h)
{
QString mousedev;
//确定触摸屏的设备文件
if (device.isEmpty()) {
#if defined(QT_QWS_IPAQ)
# ifdef QT_QWS_IPAQ_RAW
mousedev = QLatin1String("/dev/h3600_tsraw");
# else
mousedev = QLatin1String("/dev/h3600_ts");
# endif
#else
mousedev = QLatin1String("/dev/ts");
#endif
} else {
mousedev = device;
}
if ((mouseFD = open(mousedev.toLatin1().constData(), O_RDONLY | O_NDELAY)) < 0) {
qWarning("Cannot open %s (%s)", qPrintable(mousedev), strerror(errno));
return;
}
//创建一个QScketNotifier对象mouseNotifier, 其属性为QSocketNotifier::Read, 用来监听mouseFD,
//当mouseFD有新的数据可以读的时候,发射activated()信号给slot
mouseNotifier = new QSocketNotifier(mouseFD, QSocketNotifier::Read,
this);
connect(mouseNotifier, SIGNAL(activated(int)),this, SLOT(readMouseData()));
waspressed=false;
mouseIdx = 0;
}
QWSLinuxTPMouseHandlerPrivate::~QWSLinuxTPMouseHandlerPrivate()
{
if (mouseFD >= 0)
close(mouseFD);
}
//notifier默认是使能的
//当notfier使能的时候,它会发射activated信号只要监听的相应事件发生.
void QWSLinuxTPMouseHandlerPrivate::suspend()
{
if (mouseNotifier)
mouseNotifier->setEnabled(false);
}
void QWSLinuxTPMouseHandlerPrivate::resume()
{
mouseIdx=0;
currSample=0;
lastSample=0;
numSamples=0;
skipCount=0;
if (mouseNotifier)
mouseNotifier->setEnabled(true);
}
void QWSLinuxTPMouseHandlerPrivate::readMouseData()
{
if(!qt_screen)
return;
//从mouseFD读数据到mouseBuf中,一次采2048个样,每QT_QWS_TP_MINIMUM_SAMPLES个样本确定一次 鼠标位置
int n;
do {
n = read(mouseFD, mouseBuf+mouseIdx, mouseBufSize-mouseIdx);
if (n > 0)
mouseIdx += n;
} while (n > 0 && mouseIdx < mouseBufSize);
//qDebug("readMouseData()");
TS_EVENT *data;
int idx = 0;
// perhaps we shouldn't be reading EVERY SAMPLE.
while (mouseIdx-idx >= (int)sizeof(TS_EVENT)) {
uchar *mb = mouseBuf+idx;
data = (TS_EVENT *) mb;
//触摸屏点击压力不小于筏值,获取一个样本位置,表示一次有效点击
//如是小于筏值,将所有变量清零,表示没有点击,也可以理解为没有东西接触屏
if(data->pressure >= QT_QWS_TP_PRESSURE_THRESHOLD) {
#ifdef QT_QWS_SHARP
samples[currSample] = QPoint(1000 - data->x, data->y);
#else
samples[currSample] = QPoint(data->x, data->y);
#endif
//增加样本计数
//样本数达到采样最小值时,求平均数计算出当前鼠标的位置
numSamples++;
if (numSamples >= QT_QWS_TP_MINIMUM_SAMPLES) {
int sampleCount = qMin(numSamples + 1,samples.count());
// average the rest
QPoint mousePos = QPoint(0, 0);
QPoint totalMousePos = oldTotalMousePos;
totalMousePos += samples[currSample];
if(numSamples >= samples.count())
totalMousePos -= samples[lastSample];
mousePos = totalMousePos / (sampleCount - 1);
#if defined(QT_QWS_SCREEN_COORDINATES)
mousePos = handler->transform(mousePos);
#endif
if(!waspressed)
oldmouse = mousePos;
//如果当前鼠标位置与先前鼠标位置距离太远,则将此样本作无效处理
//如果当前鼠标位置与先前鼠标位置距离太近,则无需更新鼠标位置
//除此两种情况,或者因太近而有两次没有更新过鼠标位置了,则更新鼠标位置,以免误差累计
QPoint dp = mousePos - oldmouse;
int dxSqr = dp.x() * dp.x();
int dySqr = dp.y() * dp.y();
if (dxSqr + dySqr < (QT_QWS_TP_MOVE_LIMIT * QT_QWS_TP_MOVE_LIMIT)) {
if (waspressed) {
if ((dxSqr + dySqr > (QT_QWS_TP_JITTER_LIMIT * QT_QWS_TP_JITTER_LIMIT)) || skipCount > 2) {
handler->mouseChanged(mousePos,Qt::LeftButton);
oldmouse = mousePos;
skipCount = 0;
} else {
skipCount++;
}
} else {
handler->mouseChanged(mousePos,Qt::LeftButton);
oldmouse=mousePos;
waspressed=true;
}
// save recuring information
currSample++;
if (numSamples >= samples.count())
lastSample++;
oldTotalMousePos = totalMousePos;
} else {
numSamples--; // don't use this sample, it was bad.
}
} else {
// build up the average
oldTotalMousePos += samples[currSample];
currSample++;
}
if (currSample >= samples.count())
currSample = 0;
if (lastSample >= samples.count())
lastSample = 0;
} else {
//检测到没有点击,则所有变量做清零处理
currSample = 0;
lastSample = 0;
numSamples = 0;
skipCount = 0;
oldTotalMousePos = QPoint(0,0);
if (waspressed) {
handler->mouseChanged(oldmouse,0);
oldmouse = QPoint(-100, -100);
waspressed=false;
}
}
idx += sizeof(TS_EVENT);
}
int surplus = mouseIdx - idx;
for (int i = 0; i < surplus; i++)
mouseBuf[i] = mouseBuf[idx+i];
mouseIdx = surplus;
}
#include "qmouselinuxtp_qws.moc"
#endif //QT_NO_QWS_MOUSE_LINUXTP
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