Qt视图/模型

创建模型和单元格选择模型：

QStandardItemModel* model = new QStandardItemModel(2,6,this);//模型行数、模型列数、父对象
QItemSelectionModel* selection = new QItemSelectionModel(model);//创建单元格选择模型

为tableView设置数据模型：

ui.tableView->setModel(model);
	ui.tableView->setSelectionModel(selection);
	ui.tableView->setSelectionMode(QAbstractItemView::ExtendedSelection);
	ui.tableView->setSelectionBehavior(QAbstractItemView::SelectItems);

设置行数：

model->setRowCount(rowCount - 1);

设置表头：

QString header = fileContents.at(0);
	QStringList headerList = header.split(QRegExp("\\s+"),QString::SkipEmptyParts);
	model->setHorizontalHeaderLabels(headerList);

设置表格数据：

QStandardItem* item;
	for (int i = 1; i < rowCount; i++)
	{
		QString text = fileContents.at(i);
		QStringList lines = text.split(QRegExp("\\s"),QString::SkipEmptyParts);
		for (int j = 0; j < 5; j++)
		{
			item = new QStandardItem(lines.at(j));
			model->setItem(i - 1,j,item);
		}
	}

设置项是否可选：

item = new QStandardItem(headerList.at(j));
		item->setCheckable(true);
		if (lines.at(j) == "0")
			item->setCheckState(Qt::Unchecked);
		else
			item->setCheckState(Qt::Checked);
		model->setItem(i - 1,j,item);

添加行：

void port::on_add_triggered()
{
	QList itemList;
	QStandardItem* item;
	//前5列
	for (int i = 0; i < 5; i++)
	{
		item = new QStandardItem("0");
		itemList << item;
	}
	//最后一列
	QString headerStr = model->headerData(model->columnCount() - 1,Qt::Horizontal,Qt::DisplayRole).toString();
	item = new QStandardItem(headerStr);
	item->setCheckable(true);
	itemList << item;
	model->insertRow(model->rowCount(),itemList);
	QModelIndex currentIndex = model->index(model->rowCount() - 1,0);
	selection->clearSelection();
	selection->setCurrentIndex(currentIndex,QItemSelectionModel::Select);
}

插入行：

void port::on_insert_triggered()
{
	QList itemList;
	QStandardItem* item;
	//前5列
	for (int i = 0; i < 5; i++)
	{
		item = new QStandardItem("0");
		itemList << item;
	}
	//最后一列
	QString headerStr = model->headerData(model->columnCount() - 1, Qt::Horizontal, Qt::DisplayRole).toString();
	item = new QStandardItem(headerStr);
	item->setCheckable(true);
	itemList << item;
	QModelIndex currentIndex = selection->currentIndex();
	model->insertRow(currentIndex.row(), itemList);
	selection->clearSelection();
	selection->setCurrentIndex(currentIndex, QItemSelectionModel::Select);
}

删除行：

void port::on_del_triggered()
{
	QModelIndex curindex = selection->currentIndex();
	if (curindex.row() == model->rowCount() - 1)
		model->removeRow(curindex.row());
	else
	{
		model->removeRow(curindex.row());
		selection->setCurrentIndex(curindex,QItemSelectionModel::Select);
	}
}

设置表格内容格式居左：

void port::on_left_triggered()
{
	if (!selection->hasSelection()) //没有选择的项
		return;
 
	//获取选择的单元格的模型索引列表，可以是多选
	QModelIndexList selectedIndex = selection->selectedIndexes();
 
	for (int i = 0; i < selectedIndex.count(); i++)
	{
		QModelIndex aIndex = selectedIndex.at(i); //获取其中的一个模型索引
		QStandardItem* aItem = model->itemFromIndex(aIndex);//获取一个单元格的项数据对象
		aItem->setTextAlignment(Qt::AlignLeft);//设置文字对齐方式
	}
}

设置居中：

void port::on_center_triggered()
{
	if (!selection->hasSelection())
		return;
 
	QModelIndexList selectedIndex = selection->selectedIndexes();
 
	QModelIndex aIndex;
	QStandardItem   *aItem;
 
	for (int i = 0; i < selectedIndex.count(); i++)
	{
		aIndex = selectedIndex.at(i);
		aItem = model->itemFromIndex(aIndex);
		aItem->setTextAlignment(Qt::AlignHCenter);
	}
}

获取表格选中的行数：

// 在构造函数或初始化函数中连接信号与槽
connect(tableView->selectionModel(), &QItemSelectionModel::selectionChanged, this, &MyClass::handleSelectionChanged);
 
// 槽函数，处理选中行的行号
void MyClass::handleSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected) {
    QModelIndexList selectedIndexes = selected.indexes();
    if (!selectedIndexes.isEmpty()) {
        int row = selectedIndexes.first().row();
        qDebug() << "Selected row: " << row;
    }
}

获取QTabelView表格中指定行的内容：

// 获取指定行的内容
int row = 3;  // 指定行号
int column = 1;  // 指定列号
QModelIndex index = model->index(row, column);  // 获取指定行的索引
QVariant data = model->data(index);  // 获取指定索引处的数据
QString content = data.toString();  // 转换为字符串类型