在QTableView中使用各种自定义委托

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：

[cpp] view plaincopyprint?

#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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