Updating progress bar using thread

Progress bars are actively used in applications to indicate that a task is working in the background. Threads also do the same; threads too work in the background and do their assigned task. Let's see how the progress bar and threads can be linked.

In this recipe, we will be displaying a progress bar that is being updated using threads. The value in the progress bar will be updated through a running thread.

How to do it...

To associate a progress bar with a thread and to update the progress bar interactively via the thread, use the following steps:

1. Let's create an application based on the Dialog without Buttons template.

2. Add QLabel and QProgressBar widgets to the form by dragging and dropping the Label and Progress Bar widgets onto the form.
3. Set the text property of the Label widget to Downloading the file.
4. Let the objectName property of the Progress Bar widget be the default, progressBar.
5. Save the application as demoProgressBarThread.ui. The form will now appear...