model/view模型管理数据和显示层的关系，这种结构分离数据和界面。下面一个例子关于QTableView自定义模型和委托。
文章图片
【QTableView自定义模型和委托】
ItemDelegate继承QStyledItemDelegate
#include
#include
#include
class ItemDelegate : public QStyledItemDelegate
{
public:
ItemDelegate();
QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const;
void setEditorData(QWidget *editor, const QModelIndex &index) const;
void setModelData(QWidget *editor,QAbstractItemModel *model,const QModelIndex &index) const;
void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
};
|
#include "itemdelegate.h"
#include
#include
#include
#include
ItemDelegate::ItemDelegate()
{
}
QWidget *ItemDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
qDebug() << index.column();
if(index.column() == 2)
{
QTimeEdit *lineEdit = new QTimeEdit(parent);
lineEdit->setDisplayFormat("mm:ss");
return lineEdit;
}else {
return QStyledItemDelegate::createEditor(parent, option, index);
}
}
void ItemDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
if(index.column() == 2)
{
int secs = index.model()->data(index, Qt::DisplayRole).toInt();
qDebug() << "secs = " << secs;
QTimeEdit *timeEdit = qobject_cast(editor);
timeEdit->setTime(QTime(0, secs / 60, secs % 60));
}
}
void ItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{
if (index.column() == 2) {
QTimeEdit *timeEdit = qobject_cast(editor);
QTime time = timeEdit->time();
int secs = (time.minute() * 60) + time.second();
model->setData(index, secs);
}
}
void ItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
if (index.column() == 2) {
int secs = index.model()->data(index, Qt::DisplayRole).toInt();
QString text = QString("%1:%2").arg(secs / 60, 2, 10, QChar('0')).arg(secs % 60, 2, 10, QChar('0'));
QTextOption o(Qt::AlignRight | Qt::AlignVCenter);
painter->drawText(option.rect, text, o);
}
}
|
createEditor函数可以编辑修改窗口的小部件，简单来说就是返回自己想要的控件，比如说这个例子是返回的是QTimeEdit控件，可以在tableview表中编辑时间。
自定义model,继承的是QStandardItemModel,当我尝试继承QAbstractTableModel时，发现委托不起作用，原因不明？
#include
class testModel : public QStandardItemModel
{
public:
testModel();
void setHeaderList(QStringList hList);
int rowCount(const QModelIndex &parent) const;
int columnCount(const QModelIndex &parent) const;
void setStrList(QStringList hList);
QVariant headerData(int section, Qt::Orientation orientation, int role) const;
private:
QStringList strList;
QStringList headList;
};
|
#include "testmodel.h"
#include
testModel::testModel()
{
}
void testModel::setHeaderList(QStringList hList)
{
headList = hList;
}
int testModel::rowCount(const QModelIndex &parent) const
{
return strList.count();
}
int testModel::columnCount(const QModelIndex &parent) const
{
return headList.count();
}
QVariant testModel::headerData(int section, Qt::Orientation orientation, int role) const
{
if (role != Qt::DisplayRole)
return QVariant();
if(orientation == Qt::Horizontal)
return headList.at(section);
else
return strList.at(section);
}
void testModel::setStrList(QStringList hList)
{
strList = hList;
}
|
model必要的函数要写，其他的根据自己的工程进行添加
tView = new QTableView;
tView->setFixedSize(640,280);
model = new testModel;
model->setColumnCount(3);
model->setRowCount(4);
QStringList headList;
headList << "a" << "b" << "c";
QStringList sList;
sList << "1" << "2" << "3" << "4";
QStringList s1List;
s1List << "e" << "f" << "g" << "h";
model->setHeaderList(headList);
model->setStrList(sList);
model->setHorizontalHeaderLabels(headList);
for(int i=0;
i<4;
i++)
{
QModelIndex index = model->index(i, 0, QModelIndex());
model->setData(index, i);
}
tView->setModel(model);
delegate = new ItemDelegate;
tView->setItemDelegateForColumn(2,delegate);
|
推荐阅读
