@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.

@mrjj Thank you!
Sooo i kind of did what you said and used the currentIndexChanged signal. I made a Qbytearray where i store the currentindex and replace the index when an index changed. Then i can use this array to get the currentIndex from the row where the button was pressed. I know that there is probably a better solution but it works^^
I will mark this post as answered i guess.

Hi,

You'll likely have to implement a custom QStyledItemDelegate and do the painting yourself to match what you want.

@VInay123 Hi! This works for me (Qt 5.6):

connect( ui->tableWidget->verticalHeader(), SIGNAL(sectionClicked(int)), this, SLOT(sayHi()) );

Mayby try using Qt's signal slot system:

//A->reciver //B->sender //B signals: void B::newData_ready(QString data); //you have to pass apropriate type, assuming QString since it is from QLineEdit slots: void B::on_SendButton_clicked() { emit newData_ready(userData_LineEdit->text()); } //A slots: void A::on_newData_ready(QString data) { QTableWidgetItem *item = new QTableWidgetItem(data); //here add item where u want } connect(B, SIGNAL(newData_ready(QString)), A, SLOT(on_newData_ready(QString)));

Just a scheme so it probably wont work like that but I hope you get the point.

I solved it,
ui->tableWidget->setFocus();
ui->tableWidget->setCurrentCell(N-1,0);

The problem that I was confused, because the first row is 0 not "1". So when I insert a row N, I will have a total rows = N - 1.

So, my problem was an error of positioning.

Thanks Guys!!.

Has anyone found a solution to this? I'm using a QTableWidget on macOS and having the same issue. The table is always at least 76 pixels tall, even when the verticalHeader is smaller than that. Changing the minimum height for the table and/or the header (to something small like 3 pixels) doesn't change the table height; it's still 76. Once I add more rows (so that the height is > 76) the table works just fine.

@SGaist Indeed, you're right When I set the properties for my table I set that the number of rows was "1" so I have to create an "int" variable and then say that the number of rows is that variable starting from 1 and then increment that number on the loop.

@SGaist

Thank you. That seemed to be the last missing piece. It does what I want now.