qt 表格类QTableWidget实现表格操作
需求是有一堆数据（非数据库，如果是数据库可以用其他的）需要显示出来，并支持修改。
1、新增行；
2、新增列；
3、修改单个值；
4、获得总行数和总列数；
5、获得选中的坐标和值。
比较喜欢先用creator先画一个大概，全部用代码实现也可以，但是新手。。
实现效果（暂时）：
以下的关键代码：
声明：
1:
2: public slots:
3: void getTotalColumn();
4: void getTotalRow();
5: void getCurrentRow(QTableWidgetItem* item);
6: void getCurrentColumn(QTableWidgetItem* item);
7: void getCurrentValue(QTableWidgetItem* item);
8: void getCurrentItem(QTableWidgetItem* item);
9: void addRow();
10: void addColumn();
11: void delRow();
12: void delColumn();
13: };
信号槽（参数表中并不需要带上形参）：
1: connect(ui->pushButton_total, SIGNAL(clicked(bool)), this, SLOT(getTotalColumn()));
2: connect(ui->pushButton_total, SIGNAL(clicked(bool)), this, SLOT(getTotalRow()));
3: connect(ui->tableWidget, SIGNAL(itemChanged(QTableWidgetItem*)), this, SLOT(getCurrentItem(QTableWidgetItem*)));
4: connect(ui->pushButton_addRow, SIGNAL(clicked(bool)), this, SLOT(addRow()));
5: connect(ui->pushButton_addColumn, SIGNAL(clicked(bool)), this, SLOT(addColumn()));
6: connect(ui->pushButton_delRow, SIGNAL(clicked(bool)), this, SLOT(delRow()));
7: connect(ui->pushButton_delColumn, SIGNAL(clicked(bool)), this, SLOT(delColumn()));
实现：
1:
2: void MainWindow::getTotalColumn(){
3: QString totalColumn = QString::number(ui->tableWidget->columnCount(), 10);
4: ui->lineEdit_totalColumn->setText(totalColumn);
5: qDebug() << "total column::" << totalColumn;
6: }
7:
8: void MainWindow::getTotalRow(){
9: QString totalRow = QString::number(ui->tableWidget->rowCount(), 10);
10: ui->lineEdit_totalRow->setText(totalRow);
11: qDebug() << "total row::" << totalRow;
12: }
13:
14: void MainWindow::getCurrentItem(QTableWidgetItem* item){
15: getCurrentColumn(item);
16: getCurrentRow(item);
17: getCurrentValue(item);
18: }
19:
20: void MainWindow::getCurrentRow(QTableWidgetItem* item){
21: QString currentRow = QString::number(item->row(), 10);
22: ui->lineEdit_CurrentRow->setText(currentRow);
23: qDebug() << "current row::" << currentRow;
24: }
25:
26: void MainWindow::getCurrentColumn(QTableWidgetItem *item){
27: QString currentColumn = QString::number(item->column(), 10);
28: ui->lineEdit_CurrentColumn->setText(currentColumn);
29: qDebug() << "current column::" << currentColumn;
30: }
31:
32: void MainWindow::getCurrentValue(QTableWidgetItem *item){
33: ui->lineEdit_CurrentValue->setText(item->text());
34: qDebug() << "current value::" << item->text();
35: }
36:
37: void MainWindow::addRow(){
38: int totalRow = ui->tableWidget->rowCount();
39: //int totalColumn = ui->tableWidget->columnCount();
40:
41: ui->tableWidget->setRowCount(totalRow + 1);
42:
43: // 默认自增
44: //QTableWidgetItem *newHead = new QTableWidgetItem(QString("%1").arg(totalRow+1));
45: //ui->tableWidget->setVerticalHeaderItem(totalRow, newHead);
46:
47: /*
48: QTableWidgetItem *item = new QTableWidgetItem;
49: //item->setText(QString("%1").arg(5));
50: for(int i = 0; i < totalColumn; i++){
51: ui->tableWidget->setItem(totalRow, i, item);
52: }*/
53: }
54:
55: void MainWindow::addColumn(){
56: int totalColumn = ui->tableWidget->columnCount();
57: ui->tableWidget->setColumnCount(totalColumn + 1);
58: }
59:
60: void MainWindow::delRow(){
61: ui->tableWidget->removeRow(ui->tableWidget->currentRow());
62: }
63:
64: void MainWindow::delColumn(){
65: ui->tableWidget->removeColumn(ui->tableWidget->currentColumn());
66: }
代码地址：https://coding.net/u/htzy/p/testTable/git
别问我为什么不是osc。。。求放过。。
下面为项目建立过程，仅供新手看：
新建项目：
填一个项目名：
新建项目完毕：
打开mainwindow.ui
设计并完成命名（命名按自己习惯）：
在头文件mainwindow.h中新增槽函数
1: #ifndef MAINWINDOW_H
2: #define MAINWINDOW_H
3:
4: #include <QMainWindow>
5: #include <QMessageBox>
6: #include <QDebug>
7: #include <QTableWidgetItem>
8:
9: namespace Ui {
10: class MainWindow;
11: }
12:
13: class MainWindow : public QMainWindow
14: {
15: Q_OBJECT
16:
17: public:
18: explicit MainWindow(QWidget *parent = 0);
19: ~MainWindow();
20:
21: private:
22: Ui::MainWindow *ui;
23:
24: public slots:
25: void getTotalColumn();
26: void getTotalRow();
27: void getCurrentRow(QTableWidgetItem* item);
28: void getCurrentColumn(QTableWidgetItem* item);
29: void getCurrentValue(QTableWidgetItem* item);
30: void getCurrentItem(QTableWidgetItem* item);
31: void addRow();
32: void addColumn();
33: void delRow();
34: void delColumn();
35: };
36:
37: #endif // MAINWINDOW_H
在mainwindow.cpp中定义：
1: #include "mainwindow.h"
2: #include "ui_mainwindow.h"
3:
4: MainWindow::MainWindow(QWidget *parent) :
5: QMainWindow(parent),
6: ui(new Ui::MainWindow){
7: ui->setupUi(this);
8: connect(ui->pushButton_total, SIGNAL(clicked(bool)), this, SLOT(getTotalColumn()));
9: connect(ui->pushButton_total, SIGNAL(clicked(bool)), this, SLOT(getTotalRow()));
10: connect(ui->tableWidget, SIGNAL(itemChanged(QTableWidgetItem*)), this, SLOT(getCurrentItem(QTableWidgetItem*)));
11: connect(ui->pushButton_addRow, SIGNAL(clicked(bool)), this, SLOT(addRow()));
12: connect(ui->pushButton_addColumn, SIGNAL(clicked(bool)), this, SLOT(addColumn()));
13: connect(ui->pushButton_delRow, SIGNAL(clicked(bool)), this, SLOT(delRow()));
14: connect(ui->pushButton_delColumn, SIGNAL(clicked(bool)), this, SLOT(delColumn()));
15: }
16:
17: MainWindow::~MainWindow(){
18: delete ui;
19: }
20: // 获得总列数
21: void MainWindow::getTotalColumn(){
22: // 将int按十进制转成QString
23: QString totalColumn = QString::number(ui->tableWidget->columnCount(), 10);
24: ui->lineEdit_totalColumn->setText(totalColumn);
25: qDebug() << "total column::" << totalColumn;
26: }
27: // 获得总行数
28: void MainWindow::getTotalRow(){
29: QString totalRow = QString::number(ui->tableWidget->rowCount(), 10);
30: ui->lineEdit_totalRow->setText(totalRow);
31: qDebug() << "total row::" << totalRow;
32: }
33:
34: // 当某一项修改时（包括新增时），获得当前项
35: void MainWindow::getCurrentItem(QTableWidgetItem* item){
36: getCurrentColumn(item);
37: getCurrentRow(item);
38: getCurrentValue(item);
39: }
40: // 获得当前行
41: void MainWindow::getCurrentRow(QTableWidgetItem* item){
42: QString currentRow = QString::number(item->row(), 10);
43: ui->lineEdit_CurrentRow->setText(currentRow);
44: qDebug() << "current row::" << currentRow;
45: }
46: // 获得当前列
47: void MainWindow::getCurrentColumn(QTableWidgetItem *item){
48: QString currentColumn = QString::number(item->column(), 10);
49: ui->lineEdit_CurrentColumn->setText(currentColumn);
50: qDebug() << "current column::" << currentColumn;
51: }
52: // 获得当前值
53: void MainWindow::getCurrentValue(QTableWidgetItem *item){
54: ui->lineEdit_CurrentValue->setText(item->text());
55: qDebug() << "current value::" << item->text();
56: }
57:
58: // 增加一行
59: void MainWindow::addRow(){
60: int totalRow = ui->tableWidget->rowCount();
61: //int totalColumn = ui->tableWidget->columnCount();
62:
63: ui->tableWidget->setRowCount(totalRow + 1);
64:
65: // 默认自增
66: //QTableWidgetItem *newHead = new QTableWidgetItem(QString("%1").arg(totalRow+1));
67: //ui->tableWidget->setVerticalHeaderItem(totalRow, newHead);
68:
69: /*
70: QTableWidgetItem *item = new QTableWidgetItem;
71: //item->setText(QString("%1").arg(5));
72: for(int i = 0; i < totalColumn; i++){
73: ui->tableWidget->setItem(totalRow, i, item);
74: }*/
75: }
76:
77: // 增加一列
78: void MainWindow::addColumn(){
79: int totalColumn = ui->tableWidget->columnCount();
80: ui->tableWidget->setColumnCount(totalColumn + 1);
81: }
82:
83: // 删除选中的行（一定要选中并且总列数大于0）
84: void MainWindow::delRow(){
85: ui->tableWidget->removeRow(ui->tableWidget->currentRow());
86: }
87:
88: // 删除选中的列（一定要选中并且总行数大于0）
89: void MainWindow::delColumn(){
90: ui->tableWidget->removeColumn(ui->tableWidget->currentColumn());
91: }