QTreeWidget: get QTreeWidgetItem* by internal widget

[sitesv]

Hi
How to get QTreeWidgetItem after, for example, QPushButton clicked()?
I receive QWidget by sender(), but I need to rebuild part of QTreeWidget after click, so I need to control QTreeWidgetItem.
I trying to do this without QTreeWidgetItem pointers saving.

[SGaist]

Hi,

After a click on what exactly ?
What is that you want to retrieve from the QTreeWidget ?
All the items are accessible but you need to give a bit more details about what you want to do.

[sitesv]

@SGaist hi!
QTreeWidgetItem contains QPushButton.
This QTreeWidgetItem contains also child QTreeWidgetItems...
After QPushButton click I need to remove all children and create new ones...

[JonB]

@sitesv said in QTreeWidget: get QTreeWidgetItem* by internal widget:

QTreeWidgetItem contains QPushButton.

In what sense "contains"? How have you added a QPushButton to a QTreeWidgetItem, how are they linked? QTreeWidget::setItemWidget()?? In which case I think you have to walk the QTreeWidget calling QTreeWidget::itemWidget() to locate it.

[sitesv]

@JonB said in QTreeWidget: get QTreeWidgetItem* by internal widget:

In what sense "contains"? How have you added a QPushButton to a QTreeWidgetItem, how are they linked? QTreeWidget::setItemWidget()??

Hi!
Is there any other variant of adding? I know only one: setItemWidget().

[JonB]

@sitesv
No, but you didn't mention setItemWidget() anywhere, so I asked. Given that, as I said as far as I know you will need to iterate the tree's items' widgets (via QTreeWidget::itemWidget()) to find the widget (QPushButton) you are interested in.

[sitesv]

@JonB said in QTreeWidget: get QTreeWidgetItem* by internal widget:

@sitesv
No, but you didn't mention setItemWidget() anywhere, so I asked. Given that, as I said as far as I know you will need to iterate the tree's items' widgets (via QTreeWidget::itemWidget()) to find the widget (QPushButton) you are interested in.

I have one idea: if I will get the selected item when pushbutton signal emits? Is this approach correct?
Of course - I will set Treewidget selection mode as a single selection mode....

[VRonin]

Disclaimer

setItemWidget() is 99.9% of the time the wrong solution to a problem, a custom delegate is probably what you want and should use

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Practical solution: before adding the button to the tree call button->setproperty("IndexOfButton",QPersistentModelIndex(idx)) where idx is the index of the cell where you are inserting the button. Then you can just read the property to get the index back.

I can't stress enough how a custom delegate would be the correct way to do this

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P.S.
From Qt 5.2 onward sender() is also bad design. You should pass it as an argument to the slot:

• void onClicked(); becomes void onClicked(QPushButton* sender);
• connect(button,&QPushButton::clicked,this,&MyClass::onClicked); becomes connect(button,&QPushButton::clicked,this,std::bind(&MyClass::onClicked,this,button));

[JonB]

This post is deleted!

[sitesv]

@VRonin
Hi
About 99.9% of cases: I tried to make Tree via TreeView, but I was unable to achieve a persistent display of widgets because of using delegates... So I made a conclusion of using TreeWidget... So, I could save a TreeWidgetItem pointer as a button property...
But what about using 'selectedItems' method? I think this is a solution.

Thank you about 'sender' design.

[VRonin]

@sitesv said in QTreeWidget: get QTreeWidgetItem* by internal widget:

I was unable to achieve a persistent display of widgets because of using delegates

You just need to reimplement paint() and fill a QStyleOptionButton to to show the button

[sitesv]

@VRonin said in QTreeWidget: get QTreeWidgetItem* by internal widget:

You just need to reimplement paint() and fill a QStyleOptionButton to to show the button

Hi!
Is it possible to show ComboBox and CheckBox as you wrote?