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POForce update of QTListWidget to add/remove elements
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copied!<p>I'm attempting to wrap a GUI around an existing management console app. The main function is to search for network devices, which is given a timeout and is essentially a blocking call until the timeout has expired (using sleep to do the blocking). In this example the call is <code>this->Manager->Search(...)</code>.</p> <p>My issue is that I want the QListWidget to display "Searching..." while the search is taking place, and then update with the results at the completion of the search. My on-click code for the <code>Search</code> button is as follows:</p> <pre><code>void ManagerGUI::on_searchButton_clicked() { ui->IPList->clear(); new QListWidgetItem(tr("Searching..."), ui->IPList); ui->IPList->repaint(); this->Manager->Search(static_cast<unsigned int>(this->ui->searchTime->value()*1000.0)); ui->IPList->clear(); if(this->Manager->GetNumInList() != 0) this->displayFoundInList(this->Manager->GetFoundList()); else new QListWidgetItem(tr("No Eyes Found"), ui->IPList); ui->IPList->repaint(); } </code></pre> <p>When I hit the button, the <code>QListWidget</code> <code>IPList</code> does not update until after the timeout has taken place (and I assume until after this callback has terminated). Does anyone have any suggestions? I was under the impression that calling <code>ui->IPList->repaint()</code> would cause an immediate redraw of the list.</p> <p>Additional info:</p> <ul> <li>QT Version 5.1.0 32-Bit</li> <li>Compiled using VS2012</li> <li>Running on Win7 Pro 64-bit (but to be ported to OSX and Linux, so nothing win-specific please)</li> </ul>

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