QT：在QTableView中使用各种自定义委托

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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

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：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();
}

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