QT

orleenjrwz

　　bug描述：
　　在MAC系统下，QTableWidget的实例在setCellWidget()显示时，如果行数超过546，那么从547行起，单元格里的组件将显示不出来了。
　　系统环境：
　　MAC OS X 10.5 or MAC OS X 10.6
　　qt 4.6.2
　　
　　关于QTableWidget还有一点值得提的是：
　　使用insertRow(int);插入行的方法速度非常慢， 如果事先知道需要插入的行数，那么最好用setRowCount(int);速度快很多倍
　　
　　下面写了一个实例程序来展示该bug，4个文件：define.h，mainwindow.h，mainwindow.cpp，main.cpp
　　
　　define.h代码
　　/*** @brief Test the bug on MAC OS X (Current QT version is 4.6.2)*        Bug description: on MAC OS X, the QTableWidget instance's cell widget disappeared begin at row 547* @file define.h* @date 2010/12/21 22:33* @author Wison Xu*/#ifndef DEFINE_H#define DEFINE_H#include <QTime>#ifndef __TIME__#define __TIME__ qPrintable(QTime::currentTime().toString("hh:mm:ss.zzz"));#endif#endif // DEFINE_H
　　
　　mainwindow.h代码：
　　/*** @brief Test the bug on MAC OS X (Current QT version is 4.6.2)*        Bug description: on MAC OS X, the QTableWidget instance's cell widget disappeared begin at row 547* @file mainwindow.h* @class MainWindow* @date 2010/12/21 22:40* @author Wison Xu*/#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QtGui/QMainWindow>#include <QSpinBox>#include <QPushButton>#include <QCheckBox>#include <QTableWidget>#define BUG_BEGIN_ROW_ON_MAC    547#define BTN_CLEAR_TEXT          "Clear Cells"#define BTN_ADD_TEXT            "Add Cells"class MainWindow : public QMainWindow{Q_OBJECTpublic:MainWindow(QWidget *parent = 0);virtual ~MainWindow();private:int m_iMaxRow;bool m_bClear;QTableWidget *m_pTable;QSpinBox *m_pSpinBox;QPushButton *m_pButton;public slots:void onButtonClicked();};#endif // MAINWINDOW_H
　　
　　mainwindow.cpp代码：
　　/*** @brief Test the bug on MAC OS X (Current QT version is 4.6.2)*        Bug description: on MAC OS X, the QTableWidget instance's cell widget disappeared begin at row 547* @file mainwindow.cpp* @class MainWindow* @date 2010/12/21 22:57* @author Wison Xu*/#include "mainwindow.h"#include "define.h"#include <QtGui/QMacStyle>MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), m_iMaxRow(BUG_BEGIN_ROW_ON_MAC), m_bClear(true), m_pTable(NULL), m_pSpinBox(NULL), m_pButton(NULL){qDebug("%s: %s: at line:%d %s: constructor Entered ", __TIME__, __FILE__, __LINE__, __FUNCTION__);m_pTable = new QTableWidget(0, 1, this);#ifdef Q_OS_WIN32m_pTable->setStyle(new QWindowsStyle());#endif#ifdef Q_OS_MACm_pTable->setStyle(new QMacStyle());#endifm_pTable->resize(600, 300);m_pTable->move(50, 50);m_pSpinBox = new QSpinBox(this);m_pSpinBox->resize(100, 20);m_pSpinBox->move(100, 10);m_pSpinBox->setMaximum(65536);m_pSpinBox->setValue(m_iMaxRow);m_pButton = new QPushButton(BTN_ADD_TEXT, this);m_pButton->resize(100, 20);m_pButton->move(250, 10);QObject::connect(m_pButton, SIGNAL(clicked()), this, SLOT(onButtonClicked()));this->resize(700, 400);qDebug("%s: %s: at line:%d %s: constructor exited ", __TIME__, __FILE__, __LINE__, __FUNCTION__);}MainWindow::~MainWindow(){}/*** slot: onButtonClicked()* @brief  slot: onButtonClicked()  clear or add cells* @arg void*/void MainWindow::onButtonClicked(){qDebug("%s: %s: at line:%d %s: Entered ", __TIME__, __FILE__, __LINE__, __FUNCTION__);m_bClear = !m_bClear;if (m_bClear){m_pTable->clear();m_pTable->setRowCount(0);m_pButton->setText(BTN_ADD_TEXT);qDebug("%s: %s: at line:%d %s: all cells cleared ", __TIME__, __FILE__, __LINE__, __FUNCTION__);return;}m_pButton->setText(BTN_CLEAR_TEXT);m_iMaxRow = m_pSpinBox->value();m_pTable->setRowCount(m_iMaxRow);   // has higher efficiency than insertRow()for (int row=0; row<m_iMaxRow; row++){//        m_pTable->insertRow(row);QCheckBox *item = new QCheckBox();m_pTable->setCellWidget(row, 0, item);}qDebug("%s: %s: at line:%d %s: exited ", __TIME__, __FILE__, __LINE__, __FUNCTION__);}
　　
　　main.cpp代码：
　　/*** @brief Test the bug on MAC OS X (Current QT version is 4.6.2)*        Bug description: on MAC OS X, the QTableWidget instance's cell widget disappeared begin at row 547* @file main.cpp* @date 2010/12/21 22:32* @author Wison Xu*/#include <QtGui/QApplication>#include "mainwindow.h"#include "define.h"int main(int argc, char *argv[]){qDebug("%s: %s: at line:%d %s: Entered ", __TIME__, __FILE__, __LINE__, __FUNCTION__);QApplication a(argc, argv);MainWindow w;w.show();int ret = a.exec();qDebug("%s: %s: at line:%d %s: exited with code %d ", __TIME__, __FILE__, __LINE__, __FUNCTION__, ret);return ret;}