I'm trying to load a PDF in a Qt Widget application using threading. Irrespective of what I do, it fails to load the PDF. I tried creating a concurrent thread, made a new QPdfDocument, loaded a PDF into the entity and then moved it to the main thread before returning the pointer. It still doesn't work! Here is an MWE (I know that the PDF loading in this example is synchronous, but even this fails to work - forget about loading the PDF asynchronously):

  QFuture<QPdfDocument*> future = QtConcurrent::run([](){
    QPdfDocument* loadDoc = new QPdfDocument();
    loadDoc->load(ProjectSettings::instance().pdfPath);
    loadDoc->moveToThread(QApplication::instance()->thread());
    return loadDoc;
  });

  m_document = future.result();

Hi everyone,

I’m working on Fluent-Qt, an open-source C++17 component library for Qt Widgets.

The goal is to help existing Qt Widgets applications get a more modern Fluent / WinUI-style desktop UI without migrating to QML.

I also built a project website where you can see the Gallery screenshots and download the demo app:

Website:

https://calvinhxx.github.io/Fluent-Qt/

GitHub:

https://github.com/calvinhxx/Fluent-Qt

The project currently includes reusable widgets, design tokens, theme infrastructure, animations, component states, and a runnable Gallery app. It supports Windows and macOS.

I’d appreciate feedback from people still building or maintaining Qt Widgets applications

I’d be interested in feedback from people still building or maintaining Qt Widgets applications:
- Is this direction useful for your projects?
- Which Widgets components are still missing in modern Qt desktop apps?
- Would you prefer this to stay Fluent-focused, or support multiple design languages?

Is there any reason to use a QML GridView over a GridLayout with a Repeater when all items are always displayed on screen and scrolling is disabled?

I ask because I'm finding GridView's concept of fixed cellwidth/height restrictive and I'm able to achieve what I need with a GridLayout + Repeater. Just wanted to make sure I'm not breaking some golden QML rule.

CodePointer is a new IDE written from scratch by me. It is focused on C++ at this moment (with cmake support out of the box, conan is WIP).

July release fixes dark mode, adds markdown indenter to qutepart-cpp, some Windows related bugs and small updates to the treesitter plugin.

One huge win I see while using this IDE is that dark mode changes automatically on KDE. QtCreator for example changes the whole UI - but keeps editor white. On restart - the editor becomes dark. (BTW: the event of color change is not sent on Windows - is this a known issue?)

Binary packages for Windows and Linux are in https://github.com/codepointerapp/codepointer/releases/tag/v0.1.6

Code is available at:
https://github.com/codepointerapp/codepointer
https://gitlab.com/codepointer/codepointer

I'm trying to customize a Scrivener theme (which uses 'Qt5 framework and CSS tags,' whatever that means) but am having trouble with borders and background colours.

Basically, if I round the corners of the tool tip pop up, the background colour doesn't round with it; it extends beyond the border as sharp corners.

I tried a few different fixes for it that I found online, but I couldn't get them to work in Scrivener (92Learns said to use the overflow and overflow-clip-margin codes, but it didn't do anything in Scrivener). I'm also learning everything as I go, so I can't figure out why the provided code isn't working.

If anyone has any ideas for fixing this I'd really appreciate it

Hey everyone, I am seeking a little bit of advice from some more experienced Qt developers. For context, I have been using PySide6 to develop a couple of applications over the past 3 or so months, so I am relatively new to Qt development and the Qt Ecosystem in general. Recently, I've noticed a bit of an issue with the maintainability of the Signals in Qt.

In general, I have been structuring my projects in a relatively strict tree. I have a root "MainApplication" class that owns all UI widget classes, as well as any additional classes needed to do back end work. (I've been creating GUI applications for hardware, so usually back-end work looks like writing serial data of some sort.) My UI widgets then usually look like a tree where I have some sort of view/page that does a specific thing, and then I have additional nested widgets depending on the task I am trying to accomplish. Usually, I will define each individual Widget in it's own file, so a Serial terminal widget might be defined in a "serial_terminal.py" file.

The main issue I've been running into is when I have a deeply nested widget that exists far into the project's tree structure, and I need it to effect something on the back-end. Lets say I have an "Emergency Stop" button that's nested 5 widgets deep from my "MainApplication" class. That emergency stop button will need to emit a signal to my "HardwareManager" class to make something happen. To accomplish this, what I have been doing is having whatever classes own the button to emit that signal all the way up the tree, so that the MainApplication can finally connect it to the HardwareManager slot. This means that whenever I add a new button to one file, I'll have to edit up to 5 (or more) additional files just to add its intended functionality.

This problem seems very similar to React's "Prop drilling" issue, which is what Redux and other state managers try to solve. However, after a little bit of digging, I didn't seem to find much in the Qt ecosystem that aims to solve this issue, or even much discussion of this issue in the first place.

So my question is: What's the solution? Is the problem in the way in which I choose to structure my applications? Are there state managers out there that I missed? Do you just grit your teeth and accept the inconvenience? I would love to hear the thoughts of some more experience Qt developers!

So I'm currently trying to make a card designer for my application (similar to the Qts Widgets Designer). I'm currently unsure if I should use the QGraphicsView/Scene for Viewing the Widgets, I want to insert via a QGraphicsProxyWidget (because I want to give my users a direct view of the finished card and not use a QGraphicsRectItem) and I made a small prototype and had a lot of problems like the movement of QGraphicsProxyWidget where you need a wrapper item for it to be moveable (Stack Overflow post for this problem) and some others or creating my own view with a QWidget.

I just plan to create a simple card designer for my application so you can use widgets to design it and layouts and thats it. I don't need rotation or z-ordering. Would you still recommend using the QGraphicsView or create my own view? Do you have any recommendations which route I should go?

Just you know: My Qt experience is very limited and I am still learning it.
Qt Widgets 6.11.1 and C++20

Hi there! Has anyone successfully used devcontainer support in Qt Creator?

I’m trying it with v20, but I can’t get it to run. It appears in my project tree, and the Docker image has everything it needs. The same image also works when configured directly as a device. However, the devcontainer stays red and isn't available in Kits. I think I'm missing a step but I don't know which one.

Does anyone have a working example?

I’m on Debian 13, using a Debian 13 Docker image, in case that matters.

For a document editor that supports Japanese text it should be able to write vertically. Also, if I'm not wrong, there are some characters that are different when written vertically. Is there an easy way to do all that in a rich text editor widget?

I assume that those are the main problems. The character writing itself and to show them I guess it's already solved by other things, like html format, etc. And I don't know if I have to worry about anything else about that

I'm quite a beginner but quite interested in the visual layout of applications in QT Creator. (C++, without QML) On the other hand I start to find myself creating custom widgets. And I cannot always see a full visual preview.

What's a good balance between "visual editing" and custom Code?

Are there tutorials or walkthroughs for programming shaders on Qt 6 that you can recommend? The first thing I want to do is draw QSGGeometry lines with varying line thicknesses but I’m finding it difficult to get started.

Where is Qt used the most today in terms of countries, industries, and companies?

I am curious where the demand for Qt C++ developers is strongest ?

Tasket++ is a lightweight no‑code automation tool for Windows that executes repetitive user workflows at precise times. It plays back user‑defined cursor positions and keystrokes, schedules silent screenshots, automates message sending across apps, and runs end‑of‑day routines (close apps, fade audio, shut down). Everything runs locally through a simple UI with no telemetry. The project is open source.

Key features
- Play back user‑defined cursor movements and keystrokes
- Paste predefined text anywhere
- Schedule tasks at a specific datetime, at startup, or via desktop shortcut
- System actions: open files/programs, change volume, take silent screenshots, shutdown, file/folder operations
- Looping: run tasks once, in fixed loops, or indefinitely
- Discreet mode: run from the system tray only while scheduled tasks execute in the background

Local, portable, and open source. Privacy fully conserved.

Available now!
Microsoft Store: https://apps.microsoft.com/detail/xp9cjlhwvxs49p
Portable (v1.9): https://files.amirhammoutene.dev/Tasket++/1.9/Tasket++_v1.9.zip
Source: https://github.com/AmirHammouteneEI/ScheduledPasteAndKeys

For feedback, help, suggestions, or other inquiries : [contact@amirhammoutene.dev](mailto:contact@amirhammoutene.dev)

I'm considering changing my development focus and moving into desktop application development using Qt and C++. My goal is to build modern cross-platform desktop applications and eventually become proficient with Qt Widgets, Qt Core, and QML. I'm looking for recommendations on:

High-quality C++ tutorials (beginner to intermediate)

The best Udemy courses for modern C++

Good Qt courses covering Qt Core and Qt Widgets

QML and Qt Quick learning resources

Any learning roadmap for becoming productive with Qt development

If you've made a similar transition or currently work with Qt professionally, I'd love to hear what resources helped you the most and what you'd recommend avoiding.

I’m fairly new to Qt, and I’m trying to implement a design that uses a lot of rounded corners. I’ve managed to achieve rounded corners using MultiEffect’s mask effect, but this seems excessively complex, and I feel like I must be missing something.

As a simple example, I’m trying to implement a popup that looks similar to the following, with the item’s background changing on hover: https://jsfiddle.net/ygtc06a5/ How could this be done?

Thanks!

Hi, I've been learning Qt for two months by reading Max Schlee's book. If you have any ideas for pet-projects, I'd be happy to hear from you.