CODEWITHSUNDEEP
c++qt
SteeveDroz
SteeveDroz

Reputation: 6134

Selecting a QListWidgetItem when adding it

I have a QListWidget in a Form with a QListWidgetItem displaying "Add new". When I click on it, I'd like a serie of things to happen:

  1. A QInputDialog::getText asks for the content of the new item.
  2. A new item is added to the list with the given text.
  3. The list is sorted, except for the "Add new" that stays at the end (this is done by removing the "Add new" item, sorting, and adding the removed item again).
  4. The new item is selected.

That last part is the one I'm having trouble. I've tried many different approaches, all leading to the same result: the item I want selected has a dashed border and it understood as selected (by ui->list->selectedItems() for example), but the selection color stays on the last item before the "Add new".

What I tried

What I noticed

When the debugger is on with a breakpoint that slowly goes through those steps, I notice everything seems to work nicely, but the UI isn't updated before the function I'm calling is done.

Also, when I want to select a given item from the list from a slot called by another button click, it works correctly with item->setSelected(true); (and the others too).

My guess: I can't select the item in the same function I add it because I can't graphically select something that isn't there yet.

Any guess on how to achieve this?

Note

If you're experiencing the same problem, please read the comment on the selected answer, it was actually a signal problem!

Upvotes: 0

Views: 777

Answers (2)

Mathias Schmid
Mathias Schmid

Reputation: 441

Did you try to select added item and after that set current row to row index of added item. This works in my example.

Example: mainwindow.cpp

#include <QInputDialog>
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->listWidget->addItem("Add New");
    connect(ui->listWidget, SIGNAL(itemClicked(QListWidgetItem *)), this, SLOT(slot_itemClicked(QListWidgetItem *)));
}

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

void MainWindow::slot_itemClicked(QListWidgetItem *item)
{
    if (item && (item->text() == "Add New"))
    {
        QString text = QInputDialog::getText(this, "Input item text", "Text: ");
        QListWidgetItem *newItem = new QListWidgetItem(text);

        // Add new item and sort list
        ui->listWidget->addItem(newItem);
        ui->listWidget->sortItems();

        // Move "Add New" item to list end
        item = ui->listWidget->takeItem(ui->listWidget->row(item));
        ui->listWidget->addItem(item);

        // Select new item
        // Set current row to index of new item row
        newItem->setSelected(true);
        ui->listWidget->setCurrentRow(ui->listWidget->row(newItem));
    }
}

Upvotes: 1

Serhiy Kulish
Serhiy Kulish

Reputation: 1122

If you can select item from regular slot so just emit dummy signal from very short timer. Like this

//add item
//...
QTimer::singleShot(1, this, SLOT(MySlotForSelectItem())); // 1 ms timer

MainWindow::MySlotForSelectItem()
{
     //select item
}

Upvotes: 0

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