QT：在QTableView中使用各种控件委托
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_OBJECTpublic: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_OBJECTpublic: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_OBJECTpublic: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Femaleclass SexDelegate : public QItemDelegate{Q_OBJECTpublic: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_OBJECTpublic: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_OBJECTpublic: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();}