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void QTableWidget::removeRow ( int row )   [slot]
Removes the row row and all its items from the table.

#ifndef _CWidget_H_
#define _CWidget_H_

#include <QtGui>
#include <QWidget>



class CWidget : public QWidget
{
    Q_OBJECT

public:
    CWidget(QWidget *parent = 0);

private:
	QLineEdit *line1, *line2;
	QLabel *labelPapka;
	QPushButton *pushButton1, *pushButton2,  *pushButton3;

	QTableWidget *table;	
	// строка в таблице
	int i,j;
	int x;
	QTableWidgetItem *twi1[5];	
	QLabel *lab2[5], *lab3[5];

public slots:
	void addStr();
	void delStr();
	void delAll();
};

#endif // _CWidget_H_

#include "CWidget.h"


CWidget::CWidget(QWidget *parent) :QWidget(parent)
{
	
	i=0; j=0; // 1-я строка

	resize(750,300); // размер СWidget
	
	// таблица
	table = new QTableWidget;
	table->setColumnCount(3);
	table->horizontalHeader()->setDefaultAlignment(Qt::AlignCenter); 
	table->horizontalHeader()->setResizeMode(QHeaderView::Stretch); //автоширина колонок
	table->setSelectionBehavior(QAbstractItemView::SelectRows);     // выделить 1 строку
		
	QStringList *lst = new QStringList;
	*lst << "linc" << "name" << "length"; 
	table->setHorizontalHeaderLabels(*lst); 

	//гипер-ссылка
	line1 = new QLineEdit("http://");
	QLabel* label_Linc = new QLabel("Linc:");
	label_Linc->setBuddy(line1);
	
	//кнопки
	pushButton1 = new QPushButton("AddStr");
	pushButton2 = new QPushButton("DelStr");
	pushButton3 = new QPushButton("DelAll");

	// папка
	labelPapka = new QLabel("Papka");
	line2 = new QLineEdit("C:\\Papka\\");


	//1 - left
	QGridLayout* left_Layout = new QGridLayout;
	left_Layout->addWidget(label_Linc, 0, 0);
	left_Layout->addWidget(line1, 0, 1);
	left_Layout->addWidget(table, 1, 0, 1, 2);
	left_Layout->addWidget(labelPapka, 2, 0);
	left_Layout->addWidget(line2, 2, 1);
	//2 - right 
	QVBoxLayout* right_Layout = new QVBoxLayout;
	right_Layout->addWidget(pushButton1);
	right_Layout->addWidget(pushButton2);
	right_Layout->addWidget(pushButton3);
	//3 - main
	QHBoxLayout* main_Layout= new QHBoxLayout;
	main_Layout->addLayout(left_Layout);
	main_Layout->addLayout(right_Layout);
	setLayout(main_Layout);


	// добавить строку
	connect(pushButton1, SIGNAL(clicked() ), SLOT( addStr() ));	
	// удалить строку
	connect(pushButton2, SIGNAL(clicked() ), SLOT( delStr() ));
	// удалить все строки
	connect(pushButton3, SIGNAL(clicked() ), SLOT( delAll() ));

}


void CWidget::addStr()
{		
	// вставить строку
	table->insertRow(i);

	twi1[i] = new QTableWidgetItem(QString("http://"));  //1 
	table->setItem(i, j, twi1[i]);	 	
	
	lab2[i] = new QLabel("10");
	table->setCellWidget(i, j+1, lab2[i]);			     //2

	lab3[i] = new QLabel("20");
	table->setCellWidget(i, j+2, lab3[i]);			     //3

	// 0 0  |  0 1
	// 1 0  |  1 1	
	i++; j=0;         // еще строка
}


void CWidget::delStr()
{

	int x = table->currentIndex().row();	

	// удалить строку
	table->removeRow(x);
	
	if (x > 0) i= i-1;
	else i = 0;
}


void CWidget::delAll()
{

	table->clearContents();
	table->clear();

	QStringList *lst = new QStringList;
	*lst << "linc" << "name" << "length"; 
	table->setHorizontalHeaderLabels(*lst);

	i = 0;
}