How to programmatically stop editing QTreeWidget in Qt?

Question

I have a QTreeWidget and two buttons "+" and "-". When I press "+" I want to add new item to QTreeWidget and I want that item to be in edit mode. I managed to do that with following code (it gets called every time "+" is pressed):

// QTreeWidgetItem* lastItem = getLastItem();
// if (lastItem) { widget->closePersistentEditor(lastItem); }

QTreeWidgetItem* item = new QTreeWidgetItem(widget, {"100000"});
item->setFlags(item->flags() | Qt::ItemIsEditable);
widget->addTopLevelItem(item);
widget->editItem(item);

Problem is when I try to add a new item, but don't exit edit mode before adding (press Enter or something). I get error edit: editing failed and new item is added below current item (which is still in edit mode).

What I would like is that current item exists edit mode and that newly added item becomes focused and enters edit mode.

I tried to do that with first getting the last item in a QTreeWidget and calling closePersistentEditor(lastItem) (commented code) and then creating and adding new item, but it didn't work. So, how to close currently opened edit on item?

EDIT: Ok, I have added additional code with minimal example. Only thing you have to do to build it is to add QTreeWidget and QPushButton to the form mainwindow.ui and connect that button to on_btnAdd_clicked():

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QTreeWidget>
#include <QTreeWidgetItem>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_btnAdd_clicked()
{
    QTreeWidgetItem* item = new QTreeWidgetItem(ui->treeWidget, {"100000"});
    item->setFlags(item->flags() | Qt::ItemIsEditable);
    ui->treeWidget->addTopLevelItem(item);
    ui->treeWidget->editItem(item);
}

EDIT2: This is happening on macOS (Mojave) with Qt 5.12.

@user6528273, i suppose getLastItem is the OP-s own method. @dosvarog, can you share some more details about your code (maybe even a reproducible code snippet which demonstrates the issue)? Do you use a model behind the view? And if yes, do you add the new item via the model? — zgyarmati
this is happening on macOS with Qt 5.12 see - without enough details, looking for a solution is like shooting in a dark room. Anyway, now it makes sense and I have retracted my close vote. So, it looks like either it was a bug, which has been already addressed, or a Mac specific issue. I am on Win 10 with Qt 5.15.1, so I can't help further. — scopchanov
It seems it is a bug in Qt, now I found some bug report with similar issue: bugreports.qt.io/browse/QTBUG-26838 . I didn't know that default behaviour is the one I am looking for, so it never occurred to me that it could be a bug. Thanks anyway! — dosvarog

dosvarog dosvarog · Accepted Answer · 2020-10-27T20:32:06

Ok, it looks like this is a bug in Qt for macOS. Workaround that I did is following:

QTreeWidgetItem* lastItem = getLastTreeWidgetItem(widget);
if (lastItem) {
    widget->setDisabled(true);
    widget->setDisabled(false);
}
conversation->setFlags(conversation->flags() | Qt::ItemIsEditable);

getLastTreeWidget() is my own method that returns last added item in a QTreeWidget. Now every time when I press button to add new item, previous gets deselected and newly added enters edit mode.

How to programmatically stop editing QTreeWidget in Qt?

1 Answers