@hobbyProgrammer After fetching data from database, https://doc.qt.io/qt-5/qvariant.html#isNull or (if you are SQL) https://doc.qt.io/qt-5/qsqlfield.html#isNull is the thing to test.

Thanks that worked

@y_belikov Well, follow the references until you reach the first cell (then you have circular references) or last cell without references. For the first case you actually should see whether you visit one cell more than once.

@SGaist said in Add Qlabel as item in QTableview: QStyledItemDelegate Ok..I'll try with that. from google search maybe this kind of output it will give, which maybe as our requirement. Else, I have some lengthy approach..implement custom label with mousepressevent handled which emits the object name and add these custom labels, 20 in HLayout and add hlayouts in a vlayout... Thanks!

You won't get a paint event at all during drag'n'drop I would guess since the cursor is not directly painted by Qt when I'm correct.

Ok solved, Im gigantic NUB. I used itemAt instead of indexAt and took me a while to notice it... everything works! thanks!!!

@fouad20013 Previously you talked about QTable..., now you're saying QTree..... But the same is the case either way. QTableWidget inherits QTableView. It should be the case that anything QTableWidget does you could do yourself using QTableView. The Q...Widgets are effectively just a convenience implementation off the Q...View, they provide an "item-based table view with a default model" if that's what you want. However, I think you will have the same issues whether you use a QTableView or a QTableWidget. Why do you think a QTableView/QTreeView would solve your issue?

Thanks I ended up doing the simplest thing: QString descriptionText = QFontMetrics(table->font()).elidedText(m_description, Qt::ElideRight, uiSettings::descriptionTextWidth, 0); QTableWidgetItem *descriptionItem = new QTableWidgetItem(descriptionText); descriptionItem->setToolTip(m_description); table->setItem(r, 0, descriptionItem);

Forget my question. I have found the problem. It is not realted to QTableWidget. It just a problem with my QSS. In fact the scroll bar is present. But in "white on white"!

ok, the template solution is also working here. Thanks a lot for your help!

For future reference, this approach only works if you know in advance all the roles you will use. You can use KSelectionProxyModel instead if you need a proper general implementation

This is strange. could you try if this snippet works for you? #include <QApplication> #include <QWidget> #include <QVBoxLayout> #include <QPushButton> #include <QTableWidget> #include <QLabel> int main(int argc, char *argv[]) { QApplication a(argc, argv); QWidget mainWid; QStringList changedValues; QVBoxLayout* mainLay=new QVBoxLayout(&mainWid); QTableWidget* tableWidget = new QTableWidget(&mainWid); QPushButton* button = new QPushButton(QStringLiteral("Display list"),&mainWid); QLabel* resultLabel = new QLabel(&mainWid); mainLay->addWidget(tableWidget); mainLay->addWidget(button ); mainLay->addWidget(resultLabel ); tableWidget->setColumnCount(1); tableWidget->setRowCount(5); for(int i=0;i<5;i++){ QTableWidgetItem* const newItem= new QTableWidgetItem; newItem->setData(Qt::EditRole,i); tableWidget->setItem(i,0,newItem); } QObject::connect(tableWidget,&QTableWidget::cellChanged,[&changedValues,tableWidget](int row, int column)->void{changedValues<<tableWidget->item(row,column)->text();}); QObject::connect(button ,&QPushButton::clicked,[&changedValues,resultLabel ]()->void{resultLabel->setText(changedValues.join(','));}); mainWid.show(); return a.exec(); }

Then even easier to use 1 QSqlQueryModel or QSqlTableModel

Sure you can, loop through the content of the left QTableWidget and update the content of the right table to match. But again, you seem to overcomplicate things.

What removeRows does What removeColumns does (if called after remove rows it basically only clears horizontal headers)

Hi, How did you made your table ?

@Lasith Instead of 100 use ui->tableWidget->rowCount().

@mrjj Thanks for your response. I have to admit that I figured that part already, but it looked a bit out of style for Qt. Therefore, I was not sure, if I simply overlooked a more obvious way. Sometimes one dos not recognize the forest, because of the wood the around ;) Finally the implementation looked less complicated than I thought initially. And it works.

In 90% of the cases you can use QStandardItemModel instead of going through the minefield that is subclassing an abstract model. My advice is just to use that "universal model" instead of a custom one. If you really, really want to customise it as performance of QStandardItemModel is a problem then make sure you run your model through the Model Test (needs just a couple of trivial fixes to work on Qt5) that will tell you if you did everything as you were supposed to or you fell in the countless pitfalls of model subclassing

Hi and welcome to devnet, You're on the wrong column, it should be 0.

Hello guys. Thanks for your answerS. The "error" was simple, stupid. In fact the _manageOrderedTable is an instance of a class called ManageOrderedTable which inherits from QTableWidget. In this class, there's a method called fillAll and I called setColumnCount() from there. Bad idea. When I call this method from upon the for loop, everything is fine. I don't understand why. I could understand if setColumnCount() were called too late, but in this case I should have a segfault, trying to call a cell that doesn't exist. Well, I don't really understand why but now it works... Tank you for your help, Patrick.

@Swapnil_Shelke Happy to see that it helped you, You are welcome =)

this should return the list of the row indexes as sorted in the view. Hidden rows will be placed at the beginning QList<int> viewIndexes(const QHeaderView* const view){ if(!view) return QList<int>(); const int numSections= view->count(); QMap<int,int> sorter; for(int i=0;i<numSections;++i) sorter.insert(view->sectionPosition(i),i); return sorter.values(); } or alternatively: QVector<int> viewIndexes(const QHeaderView* const view){ if(!view) return QVector<int>(); const int numSections=view->count(); QVector<int> result(numSections); for(int i=0;i<numSections;++i) result[i]=i; // Use stable_sort if you want the hidden sections still placed at the beginning but in the same order as the original model std::sort(result.begin(),result.end(),[view](int a,int b)->bool{return view->sectionPosition(a)<view->sectionPosition(b);}); return result; } You'll have to benchmark them to tell which is more efficient

@VRonin hey it works. I created a separate qt project and it's working there. I will see if I am doing something wrong in my project. Actually the row to which I am trying to set a background color also has some color set to it in table widget stylesheet. Also tablewidget items also have a background color. I will check there. Thanks again.

Thanks guys for your suggestions. Probably I am following the QHash implementation as next step. The proximity to maps make it easy.

Thanks, hiding the column works a lot faster. I'm not sure it that'll give me other problems but for now I made it work.

@VRonin I am trying to do this. I am a newbiew, so need your assistance. Hope you can understand. Here are some rough code. MediaFileItemDelegate::MediaFileItemDelegate(QObject *parent) :QStyledItemDelegate(parent) { } MediaFileItemDelegate::~MediaFileItemDelegate() { } void MediaFileItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option,const QModelIndex& index) const { QString str = qvariant_cast<QString>(index.data()); painter->save(); painter->setPen(Qt::NoPen); // painter->drawRect(option.rect); if(index.data().toString().contains("xyz")) { painter->setPen(Qt::blue); painter->drawText(option, str); } else { QStyledItemDelegate::paint(painter, option, index); } painter->restore(); } Currently this code is highlighting the whole text (example: My name is xyz) and I am doing manually matching. So how can i select only xyz. Thanks

@mrjj i replace this line ui->tableWidget->item(x,y)->setText(rowData[y]); with ui->tableWidget->setItem(x-1,y,new QTableWidgetItem(rowData[y])); loading is working fine now thanks problem solved

Glad it works. So this part is solved then.

Glad it works so far. Good luck with the rest.

@pauledd :) class MyWidget : public QWidget << yes that is subclassing :) Also, a widget can only paint on it self. its not possible to paint on other widget from inside a paintevent. Thats why the first sample didnt work. You asked painter to paint on tab from inside mainwindows paintEvent :) I guess you already found out but its just to make clear for other readers.

@mrjj thanks a lot. solved

Ok, now works perfectly, but I would ask if you can change the animation drag'n'drop between the lines. Currently, during the row drag it appears a copy of a line anchored to the mouse cursor. You can change this animation? #include <QWidget> #include <QTableWidget> #include <QDropEvent> #include <QDragMoveEvent> #include <QDropEvent> #include <QMimeData> #include <QDebug> #include <QKeyEvent> #ifndef DTABLEWIDGET_H #define DTABLEWIDGET_H class DTableWidget : public QTableWidget { Q_OBJECT public: DTableWidget(QWidget *parent = 0); public slots: signals: void keyboard(QKeyEvent *event); void dropped(const QMimeData* mimeData = 0); void moved(int old_row, int new_row); protected: void dragEnterEvent(QDragEnterEvent *event); void dragMoveEvent(QDragMoveEvent *event); void dragLeaveEvent(QDragLeaveEvent *event); void dropEvent(QDropEvent *event); void keyPressEvent(QKeyEvent* event); private: }; #endif #include <QtGui> #include "dtablewidget.h" #include "nofocusproxystyle.cpp" DTableWidget::DTableWidget(QWidget *parent) : QTableWidget(parent) { //set widget default properties: setFrameStyle(QFrame::Sunken | QFrame::StyledPanel); setDropIndicatorShown(true); setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn); setEditTriggers(QAbstractItemView::NoEditTriggers); setDragDropMode(QAbstractItemView::DropOnly); setAlternatingRowColors(true); setSelectionBehavior(QAbstractItemView::SelectRows); setShowGrid(false); setAcceptDrops(true); setWordWrap(false); setStyleSheet("selection-background-color: yellow;" "selection-color: #002041;" "font-size: 75%;" ); setStyle(new NoFocusProxyStyle()); } void DTableWidget::dragEnterEvent(QDragEnterEvent *event) { event->acceptProposedAction(); } void DTableWidget::dragMoveEvent(QDragMoveEvent *event) { event->acceptProposedAction(); } void DTableWidget::dropEvent(QDropEvent *event) { event->acceptProposedAction(); if (event->mimeData()->urls().size() > 0) emit dropped(event->mimeData()); else { QPoint old_coordinates = QPoint(-1,-1); int dropAction = event->dropAction(); if(currentItem() != NULL) //Check if user is not accessing empty cell { old_coordinates = QPoint(currentItem()->row(), currentItem()->column()); } QTableWidget::dropEvent(event); qDebug() << "Detected drop event..."; if(this->itemAt(event->pos().x(), event->pos().y()) != NULL && old_coordinates != QPoint(-1, -1)) { qDebug() << "Drop Event Accepted."; qDebug() << "Source: " << old_coordinates.x() << old_coordinates.y() << "Destinition: " << this->itemAt( event->pos().x(), event->pos().y() )->row() << this->itemAt( event->pos().x(), event->pos().y() )->column() << "Type: " << dropAction; emit moved(old_coordinates.x(), itemAt( event->pos().x(), event->pos().y())->row()); } } } void DTableWidget::dragLeaveEvent(QDragLeaveEvent *event) { event->accept(); } void DTableWidget::keyPressEvent(QKeyEvent *event) { emit keyboard(event); }

saveToCsv(m_tableWidget->model(), QFileDialog::getSaveFileName(this,tr("Save to csv"),QString(),tr("Comma separated values (*.csv)")) ); loadFromCsv(m_tableWidget->model(), QFileDialog::getOpenFileName(this, tr("Open csv"),QString(),tr("Comma separated values (*.csv)")) );

Hi, If you don't want any scrollbars then you have to ensure that the widget is big enough to show everything.

QTableWidget already has an internal model otherwise it's a QTableView.