@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.

@mrjj Thanks :)

@mrjj Ok so, it seems that it doesn't detect the table "usuarios" even though it's there...

So in my sqlite editor I executed the command and it worked properly:
http://s18.postimg.org/iqry91pmx/image.png

EDIT: I solved that problem: the program was searching the db in the remote directory not in the real directory, now it doesn't says any error but It doesn't shows the information.

I've tried (SELECT * FROM usuarios) but nothing, it doesn't works.

2ND EDIT: I solved the problem, it was on my printing method, I tried a much simpler methor by doing:

int i=0; while (query.next()) { ui->tableWidget->setItem(i,0,new QTableWidgetItem(query.value(0).toString())); ui->tableWidget->setItem(i,1,new QTableWidgetItem(query.value(1).toString())); ui->tableWidget->setItem(i,2,new QTableWidgetItem(query.value(2).toString())); i++; ui->tableWidget->insertRow(i); }

Thank you for your help.

Hi,

Why not do that at the editor level ? Using e.g. a QStyledItemDelegate. Doing so would avoid user entering anything that's incorrect.

@mrjj
(Since you are a Mod I applogize if this is breaking some kind of double post rule or an issue over becoming off topic)

Also, perhaps I should make a new topic, but there is one other thing I am stuck on now. I currently have a QTableWidget in my UI with three columns. I want the first two to be fixed in width, and all three to not be changeable by the user. The third column's width I want to be a little picky about though. I want it so that it can dynamically change size so that if text is put into it that is too large it will expand with a scroll bar instead of adding a second line to the cell, which I have accomplished with:

ui->imgTable->horizontalHeader()->setSectionResizeMode(2,QHeaderView::ResizeToContents);

But the other condition is that I want it to always at least fill up the rest of the tables space so that there isn't a blank white area to the right of the column. Because if there is nothing in the cell and the above mode is applied the column width shrinks to the size of the header name "File Path" which is too small to take up the rest of the tables width. This normally can be accomplished by using:

ui->imgTable->horizontalHeader()->setSectionResizeMode(2,QHeaderView::Stretch)

but that cancels out the previous setting and makes it so that if the text gets too big a 2nd line in the cell is added (which I do not want) instead of the table gaining a scroll bar (which is what I want). So I figured, OK, all I need to do is leave it on "ResizeToContents" and then just set a minimum size so that it will dynamically resize the column but never become so small that it wont take up the whole table region. The problem I have is two fold.

First, the closest command I could find to do this is:

ui->imgTable->horizontalHeader()->setMinimumSectionSize(150)

but the problem is there is no index argument so it seems that it will set a minimum size for all columns instead of just column 2. I cannot seem to find a solution that only affects one column.

Second, even if I can set a minimum size, the size is always an integer so I probably cannot get the minimum size set perfectly so that there is no visible space between the last column and the table right extent. Therfore it would be optimal if I could somehow have a "ReizeToContents"/"Stretch" hybrid that made it stretch to the table extent but resize dynamically only if the text gets too big for the cell. Basically, "Stretch" by default, but becomes "ResizeToConetents" if the cell text length hit the limit of the cell size. It doesn't look like this can be done however. I can think of a way to cause this behavior but it would be ugly:

Check the length of the cell text everytime a change is made (there is only one way for it to change so this isn't too hard) Since the size of the table is fixed I can determine how many characters it would take to go over the cell size, which would normally cause a 2nd line to be added Have the behavior default to stretch but change to ResizeToContents if the length of the text in the cell gets large enough that it would create a 2nd line.

The above should give the exact behavior I am looking for but I would prefer to not having to resort to that as it is ugly, feels inefficient, and seems unnecessary for something that looks like it could take 1-3 lines if I could find the right functions.

Does Qt have something to support this behavior or will I have to implement my awkward solution? I can take pictures if some of my explanations are unclear.

@Rohith

np. sometimes its hard to understand the real issue
when seeing just part of code but
glad it worked :)

you are very welcome.

Hi and welcome to devnet,

How are you getting that value ?

@coow67
connect to the model's rowsInserted() signal

@jsulm : Thanks for ur reply.....My doubt is cleared.

Thanx bsomervi. Good point. I could go with an even more general signal (like itemClicked) but finding the signal that will more rightly pick only a checkbox checked/unchecked action would be optimal.

Hi
Thank you. you helped so much. And if I can't fix the scrollbar problem I will ask it in forum