Qt 触摸屏校准程序

1、Qt/Embedded中与用户输入事件相关的信号，是建立在对底层输入设备的接口调用之上 的，一般通过对设备文件的I/O读写来实现。大部分这样的驱动程序已经被封装进Qt库 当中，形成了相应的设备驱动接口，如显示卡驱动、鼠标、键盘、串口和并口等。其中鼠 标设备的抽象基类为QWSMouse Handler，从该类又重新派生出一些具体的鼠标类设备 的实现类。在3.3.4版本系列的Qt/Embedded中，鼠标类设备的派生结构如图3所示。图3鼠标类设备的派生结构图(灰色线框表示可省略类结构)鼠标类设备的加载方式与KeyBoard设备加载方式是类似的，在系统构造QWSServer对象时，调用成 员函数 Q

2、WSServer: openMouse,程序在 QWSServer: openMouse 函 数中再调用 QmouseDriverFactory:create ()或 QmouseDriverPlugin: create ()。该函数根 据Linux系统的环境变量QWS_MOUSE_PROTO获得鼠标类设备的设备类型和设备节 点。打开并返回相应设备的基类指针QWSMouseHandler给系统，系统通过操作该基类派 生出的具体子类设备指针QWSCustomMouseHandler,获得对具体鼠标类设备的调用操作 触摸屏和鼠标类设备在功能上基本是一致的，因此，在Qt库中一般把触摸屏模拟成鼠标 设

3、备来实现对触摸屏设备的操作。基于Qt的触摸屏校准程序头文件#include #include class CalibrationDialog : public QDialogpublic:CalibrationDialog(QWidget *parent = 0);CalibrationDialog();int exec();void close();protected:void paintEvent(QPaintEvent*);void mouseReleaseEvent(QMouseEvent*);void accept();private:QWSPointerCalibrationDat

4、a data;int pressCount;源文件#include calibrationdialog.h#include #include #include #include #include #include #include #include #include #include maindialog.h#include application.h该文件为触摸屏校准窗口主程序extern MainDialog *g_pMainDlg;根据屏幕上的 TopLeft，TopRight，BottomRight，BottomLeft，Center 五个点进行触摸屏校准static int loca

5、tion5 = QWSPointerCalibrationData:TopLeft,QWSPointerCalibrationData:TopRight,QWSPointerCalibrationData:BottomRight,QWSPointerCalibrationData:BottomLeft,QWSPointerCalibrationData:Center;描述：触摸屏校准窗口构造函数参数：parent -父窗口指针返回：无CalibrationDialog:CalibrationDialog(QWidget *parent) :QDialog(parent) setObjectNa

6、me(CalibrationDialog);QRect desktop = QApplication:desktop()-geometry(); desktop.moveTo(QPoint(0, 0); setGeometry(desktop);setFocusPolicy(Qt:StrongFocus);setFocus();setModal(true);int width = qt_screen-deviceWidth();int height = qt_screen-deviceHeight();int dx = width / 10;int dy = height / 10;QPoin

7、t *points = data.screenPoints; pointsQWSPointerCalibrationData:TopLeft = QPoint(dx, dy); pointsQWSPointerCalibrationData:BottomLeft = QPoint(dx, height - dy); pointsQWSPointerCalibrationData:BottomRight = QPoint(width - dx, height - dy); pointsQWSPointerCalibrationData:TopRight = QPoint(width - dx,

8、dy); pointsQWSPointerCalibrationData:Center = QPoint(width / 2, height / 2);pressCount = 0; 描述：触摸屏校准窗口析构函数参数：无返回：无CalibrationDialog:CalibrationDialog() 描述：运行触摸屏校准窗口参数：无返回：无int CalibrationDialog:exec()(Application *)qApp)-setLCDOn();pressCount = 0;QWSServer:mouseHandler()-clearCalibration(); grabMous

9、e();/g_pMainDlg-m_pAbnormalMsgBox-hide();activateWindow();int ret = QDialog:exec(); /show();/raise(); releaseMouse();return ret;描述：触摸屏校准窗口自绘函数参数：无返回：无void CalibrationDialog:paintEvent(QPaintEvent*) QPainter p(this);p.fillRect(rect(), Qt:white);QPoint point = data.screenPointslocationpressCount;/ Map

10、 to logical coordinates in case the screen is transformedQSize screenSize(qt_screen-deviceWidth(), qt_screen-deviceHeight(); point = qt_screen-mapFromDevice(point, screenSize);p.fillRect(point.x() - 6, point.y() - 1, 13, 3, Qt:black);p.fillRect(point.x() - 1, point.y() - 6, 3, 13, Qt:black);描述：触摸屏校准窗口触摸屏/鼠标放开回调函数，记录下5 个点的触摸数据，然 后进行触摸屏校准计算参数：event -鼠标事件返回：无void CalibrationDialog:mouseReleaseEvent(QMouseEvent *event)/ Map from device coordinates in case the screen is transformed QSize screenSize(qt_screen-width(), qt_screen-height(); QPoint p = qt_s