Qt 觸摸屏校準程序

1、Qt/Embedded中與用戶輸入事件相關的信號，是建立在對底層輸入設備的接口調用之上 的，一般通過對設備文件的I/O讀寫來實現(xiàn)。大部分這樣的驅動程序已經被封裝進Qt庫 當中，形成了相應的設備驅動接口，如顯示卡驅動、鼠標、鍵盤、串口和并口等。其中鼠 標設備的抽象基類為QWSMouse Handler，從該類又重新派生出一些具體的鼠標類設備 的實現(xiàn)類。在3.3.4版本系列的Qt/Embedded中，鼠標類設備的派生結構如圖3所示。圖3鼠標類設備的派生結構圖(灰色線框表示可省略類結構)鼠標類設備的加載方式與KeyBoard設備加載方式是類似的，在系統(tǒng)構造QWSServer對象時，調用成 員函數(shù) Q

2、WSServer: openMouse,程序在 QWSServer: openMouse 函 數(shù)中再調用 QmouseDriverFactory:create ()或 QmouseDriverPlugin: create ()。該函數(shù)根 據(jù)Linux系統(tǒng)的環(huán)境變量QWS_MOUSE_PROTO獲得鼠標類設備的設備類型和設備節(jié) 點。打開并返回相應設備的基類指針QWSMouseHandler給系統(tǒng)，系統(tǒng)通過操作該基類派 生出的具體子類設備指針QWSCustomMouseHandler,獲得對具體鼠標類設備的調用操作 觸摸屏和鼠標類設備在功能上基本是一致的，因此，在Qt庫中一般把觸摸屏模擬成鼠標 設

3、備來實現(xiàn)對觸摸屏設備的操作?；赒t的觸摸屏校準程序頭文件#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該文件為觸摸屏校準窗口主程序extern MainDialog *g_pMainDlg;根據(jù)屏幕上的 TopLeft，TopRight，BottomRight，BottomLeft，Center 五個點進行觸摸屏校準static int loca

5、tion5 = QWSPointerCalibrationData:TopLeft,QWSPointerCalibrationData:TopRight,QWSPointerCalibrationData:BottomRight,QWSPointerCalibrationData:BottomLeft,QWSPointerCalibrationData:Center;描述：觸摸屏校準窗口構造函數(shù)參數(shù)：parent -父窗口指針返回：無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：觸摸屏校準窗口析構函數(shù)參數(shù)：無返回：無CalibrationDialog:CalibrationDialog() 描述：運行觸摸屏校準窗口參數(shù)：無返回：無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：觸摸屏校準窗口自繪函數(shù)參數(shù)：無返回：無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：觸摸屏校準窗口觸摸屏/鼠標放開回調函數(shù)，記錄下5 個點的觸摸數(shù)據(jù)，然 后進行觸摸屏校準計算參數(shù)：event -鼠標事件返回：無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