hide cell from tablewidget

Nevez

hello,
I wanna hide specific cells from qtablewidget. But its not working
that code :

tablewidget->cellWidget(rowindex,colindex)->hide();    // it crashes

is there any other way i can do this?

JonB

@Nevez said in hide cell from tablewidget:

// it crashes

Q_ASSERT(tablewidget->item(rowindex,colindex));
Q_ASSERT(tablewidget->cellWidget(rowindex,colindex));

I imagine this will fail. I suspect you have not put a widget into tablewidget->item(rowindex,colindex) --- either it has nothing in it, or it does not have a QWidget.

Nevez

@JonB said in hide cell from tablewidget:

Q_ASSERT(tablewidget->item(rowindex,colindex));
Q_ASSERT(tablewidget->cellWidget(rowindex,colindex));

Q_ASSERT(tablewidget->cellWidget(rowindex,colindex));

it gives error here.

so how can i hide custom indexed cells in tablewidget without adding widgets ?

JonB

@Nevez
What is a "custom indexed" cell?

So since you have not done any tablewidget->setCellWidget(rowindex,colindex,widget) there is no widget in the cell and cellWidget(rowindex,colindex) will never be right.

So what do you have in the cell, and what exactly do you mean by "hide"? It has a QTableWidgetItem just showing some text. You might blank out the text. There is no direct call to "hide" a QTableWidgetItem. According to https://forum.qt.io/topic/90416/how-to-hide-cellwidget-of-qtablewidget/6 you would have to override QTableWidget::paintEvent() and do your "hiding" there during the painting. Or there is an approach with a QStyledItemDeletegate in https://stackoverflow.com/questions/59645024/how-to-manage-visibility-of-data-in-pyqt5-qtablewidgetitem.

Nevez

thanks for the answer. For now, I continued by deleting the text in the item.
because if I try to add widgets the process will become very heavy and take long time.

I also added a button to the cells with the paint function using qstyleditemdelegate. But this overlapped with the text.
How can I solve this?

JonB

@Nevez said in hide cell from tablewidget:

because if I try to add widgets the process will become very heavy and take long time.

Indeed!

I also added a button to the cells with the paint function using qstyleditemdelegate. But this overlapped with the text.

QStyledItemDelegate::paint() says

Whenever possible, use the option while painting. Especially its rect variable to decide where to draw

So on entry option.rect states the whole cell's rectangle to draw into. If you put something like a button into that area you need to change the rectangle to exclude the area it occupies so that what you pass onto the default painter method for the text is only passed the remaining unoccupied area.