QT的MVC（View/Delegate）模型十分强大，可以利用各种控件来对表格的输入进行限制，不过我以前一直没有过，这几天研究了一下，写个小例子，希望大家喜欢。
如果看不懂这个例子，请先看QT的自带例子： http://qt-project.org/doc/qt-4.8/itemviews-spinboxdelegate.html
思路：
1：为每一列定义委托： A：第一列是编号列，使用只读委托，令该列的单元格是只读的 B：第三列是ID列，只能输入1－12个数字，利用QLineEdit委托和正则表达式对输入进行限制 C：第四年龄列，利用QSpinBox委托进行输入限制，只能输入1－100之间的数字 D：第五列是性别列，利用QComboBox委托对输入进行限制，该列的单元格只能输入Male或Female E：第六列是头像列，在该列的单元格中央放置一张头像 2：定义代理类，把所有单元格中的字符居中显示。 3：利用QSS，将表格的背景色弄成黄蓝相间。
截图：
上代码：
#include <QtGui> //编号列，只读委托 //这个方法我还真想不到，呵呵 class ReadOnlyDelegate : public QItemDelegate { Q_OBJECT public : ReadOnlyDelegate(QObject *parent = 0): QItemDelegate(parent) { } QWidget *createEditor(QWidget*parent, const QStyleOptionViewItem &option, const QModelIndex &index) const { return NULL; } }; //ID列，只能输入1－12个数字 //利用QLineEdit委托和正则表达式对输入进行限制 class UserIDDelegate : public QItemDelegate { Q_OBJECT public : UserIDDelegate(QObject *parent = 0): QItemDelegate(parent) { } QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const { QLineEdit *editor = new QLineEdit(parent); QRegExp regExp( “[0-9]{0,10}” ); editor->setValidator( new QRegExpValidator(regExp, parent)); return editor; } void setEditorData(QWidget *editor, const QModelIndex &index) const { QString text = index.model()->data(index, Qt::EditRole).toString(); QLineEdit *lineEdit = static_cast <QLineEdit*>(editor); lineEdit->setText(text); } void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const { QLineEdit *lineEdit = static_cast <QLineEdit*>(editor); QString text = lineEdit->text(); model->setData(index, text, Qt::EditRole); } void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const { editor->setGeometry(option.rect); } }; //年龄列，利用QSpinBox委托进行输入限制，只能输入1－100之间的数字 class AgeDelegate : public QItemDelegate { Q_OBJECT public : AgeDelegate(QObject *parent = 0): QItemDelegate(parent) { } QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const { QSpinBox *editor = new QSpinBox(parent); editor->setMinimum(1); editor->setMaximum(100); return editor; } void setEditorData(QWidget *editor, const QModelIndex &index) const { int value = index.model()->data(index, Qt::EditRole).toInt(); QSpinBox *spinBox = static_cast <QSpinBox*>(editor); spinBox->setValue(value); } void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const { QSpinBox *spinBox = static_cast <QSpinBox*>(editor); spinBox->interpretText(); int value = spinBox->value(); model->setData(index, value, Qt::EditRole); } void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const { editor->setGeometry(option.rect); } }; //性别列，利用QComboBox委托对输入进行限制 //这一列的单元格只能输入Male或Female class SexDelegate : public QItemDelegate { Q_OBJECT public : SexDelegate(QObject *parent = 0): QItemDelegate(parent) { } QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const { QComboBox *editor = new QComboBox(parent); editor->addItem( “Female” ); editor->addItem( “Male” ); return editor; } void setEditorData(QWidget *editor, const QModelIndex &index) const { QString text = index.model()->data(index, Qt::EditRole).toString(); QComboBox *comboBox = static_cast <QComboBox*>(editor); int tindex = comboBox->findText(text); comboBox->setCurrentIndex(tindex); } void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const { QComboBox *comboBox = static_cast <QComboBox*>(editor); QString text = comboBox->currentText(); model->setData(index, text, Qt::EditRole); } void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const { editor->setGeometry(option.rect); } }; //头像列，只是在单元格中央放一张小图而已 class IconDelegate : public QItemDelegate { Q_OBJECT public : IconDelegate(QObject *parent = 0): QItemDelegate(parent) { } void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex & index ) const { //show.bmp是在工程目录中的一张图片（其实就是QQ的图标啦，呵呵） QPixmap pixmap = QPixmap( “show.bmp” ).scaled(24, 24); qApp->style()->drawItemPixmap(painter, option.rect, Qt::AlignCenter, QPixmap(pixmap)); } }; //代理类，把所有单元格中的字符居中显示 class VIPModel : public QStandardItemModel { Q_OBJECT public : VIPModel(QObject *parent=NULL) : QStandardItemModel(parent) { } VIPModel( int row, int column, QObject *parent=NULL) : QStandardItemModel(row, column, parent) { } QVariant data( const QModelIndex &index, int role = Qt::DisplayRole) const { if ( Qt::TextAlignmentRole == role ) return Qt::AlignCenter; return QStandardItemModel::data(index, role); } }; #include “main.moc” int main( int argc, char *argv[]) { QApplication app(argc, argv); VIPModel *model = new VIPModel(5, 5); QTableView *tableView = new QTableView; //把表格的背景调成黄蓝相间 //这种方法是在网上看到的，用起来还真方便啊 tableView->setAlternatingRowColors( true ); tableView->setStyleSheet( “QTableView{background-color: rgb(250, 250, 115);” “alternate-background-color: rgb(141, 163, 215);}” ); tableView->setWindowTitle( “VIP List” ); tableView->resize(700, 400); tableView->setModel(model); QStringList headerList; headerList << “No.” << “ID” << “Name” << “Age” << “Sex” << “Show” ; model->setHorizontalHeaderLabels(headerList); tableView->verticalHeader()->setVisible( false ); tableView->horizontalHeader()->setStretchLastSection( true ); //为每一列加载委托 ReadOnlyDelegate readOnlyDelegate; tableView->setItemDelegateForColumn(0, &readOnlyDelegate); UserIDDelegate userIDDelegate; tableView->setItemDelegateForColumn(1, &userIDDelegate); AgeDelegate spinBoxDelegate; tableView->setItemDelegateForColumn(3, &spinBoxDelegate); SexDelegate comboBoxDelegate; tableView->setItemDelegateForColumn(4, &comboBoxDelegate); IconDelegate iconDelegate; tableView->setItemDelegateForColumn(5, &iconDelegate); for ( int i=0; i<10; i++) { QModelIndex index = model->index(i, 0, QModelIndex()); model->setData(index, i); } tableView->show(); return app.exec(); }