C++ 基于单元格名称替换QTableWidget中的行
假设我有一个QTableWidget,看起来像这样:C++ 基于单元格名称替换QTableWidget中的行,c++,qt,qtablewidget,C++,Qt,Qtablewidget,假设我有一个QTableWidget,看起来像这样: __| columnname1 | columnname2 1 | name1 | value1 2 | name2 | value2 3 | name3 | value3 4 | name4 | value4 ui->tableWidget->setColumnCount(2); ui->tableWidget->setSortingEnabled(false); u
__| columnname1 | columnname2
1 | name1 | value1
2 | name2 | value2
3 | name3 | value3
4 | name4 | value4
ui->tableWidget->setColumnCount(2);
ui->tableWidget->setSortingEnabled(false);
ui->tableWidget->setHorizontalHeaderLabels({"columnname1", "columnname2"});
ui->tableWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
foreach(const QString& key, keys)
{
value = jsonObj.value(key);
int currRow = ui->tableWidget->rowCount();
ui->tableWidget->insertRow(ui->tableWidget->rowCount());
ui->tableWidget->setItem(currRow, 0, new QTableWidgetItem(key));
ui->tableWidget->setItem(currRow, 1, new QTableWidgetItem(value.toString()));
}
ui->tableWidget->sortItems(int (1),Qt::DescendingOrder);
ui->tableWidget->setSortingEnabled(true);
我用这个代码创建的:
ui->tableWidget->setColumnCount(2);
foreach(const QString& key, keys)
{
value = jsonObj.value(key);
ui->tableWidget->sortItems(int (1),Qt::DescendingOrder);
int currRow = ui->tableWidget->rowCount();
ui->tableWidget->setSortingEnabled(false);
ui->tableWidget->insertRow(ui->tableWidget->rowCount());
ui->tableWidget->setItem(currRow, 0, new QTableWidgetItem(key));
ui->tableWidget->setItem(currRow, 1, new QTableWidgetItem(value.toString()));
ui->tableWidget->setHorizontalHeaderLabels({"columnname1", "columnname2"});
ui->tableWidget->setSortingEnabled(true);
ui->tableWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
}
现在,例如,我为name2添加了一个新值,如何替换name2所在的整行?首先,您要为每一行调用一些函数,这些行对于整个表只需要调用一次。相反,您的代码示例应该更像这样:
__| columnname1 | columnname2
1 | name1 | value1
2 | name2 | value2
3 | name3 | value3
4 | name4 | value4
ui->tableWidget->setColumnCount(2);
ui->tableWidget->setSortingEnabled(false);
ui->tableWidget->setHorizontalHeaderLabels({"columnname1", "columnname2"});
ui->tableWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
foreach(const QString& key, keys)
{
value = jsonObj.value(key);
int currRow = ui->tableWidget->rowCount();
ui->tableWidget->insertRow(ui->tableWidget->rowCount());
ui->tableWidget->setItem(currRow, 0, new QTableWidgetItem(key));
ui->tableWidget->setItem(currRow, 1, new QTableWidgetItem(value.toString()));
}
ui->tableWidget->sortItems(int (1),Qt::DescendingOrder);
ui->tableWidget->setSortingEnabled(true);
然后,如果行“name2”有一个新值,则只需替换该值。您已经知道如何做到这一点:
// first find the row index of row 'name2':
int rowIdx = -1;
for(int i = 0; i < ui->tableWidget->rowCount(); i++) {
if(ui->tableWidget->item(i, 0)->text() == "name2") {
rowIdx = i;
break;
}
}
if(rowIdx >= 0) {
// then EITHER replace the item:
ui->tableWidget->setItem(rowIdx, 1, new QTableWidgetItem(value.toString()));
// OR replace the data:
ui->tableWidget->item(rowIdx, 1)->setText(value.toString());
}
//首先找到行“name2”的行索引:
int rowIdx=-1;
对于(inti=0;itableWidget->rowCount();i++){
如果(ui->tableWidget->item(i,0)->text()=“name2”){
rowIdx=i;
打破
}
}
如果(rowIdx>=0){
//然后更换该项目:
ui->tableWidget->setItem(rowIdx,1,新的QTableWidgetItem(value.toString());
//或替换数据:
ui->tableWidget->item(rowIdx,1)->setText(value.toString());
}
我没有编译这个示例代码,它可能有打字错误或错误的函数名,但你会明白的。看,我不知道为什么,但当我使用这个代码时,我想更改的整行都被删除了。你的意思是删除或清除(空字段)?你用了哪种方法
new QTableWidgetItem
或setText
?已清除,抱歉,我的坏消息。我使用了与您提供的代码相同的代码,并根据我的需要进行了一些调整。。所以:``int rowIdx=-1;int i;对于(i=0;ivalue
是否实际包含内容。