@TonyRietwyk said in Qt 5.15.5 cannot load custom designer plugin: Does the installed Designer need 64-bit dll's? Designer or Creator? (Qt Creator has an embedded version of Qt Designer) Recent releases of Qt Creator are 64-bit. You can check by clicking Help > About Qt Creator... I'm not sure about the bitness of the stand-alone Qt Designer . API-MS-WIN-CORE-SYNCH-L1-2-0.DLL seems to be causing a cyclic dependency with KERNEL32.dll. The API-MS-*.dll are usually false positives. Ignore them. I have Qt5.15.5/5.15.5/msvc2019/bin in my system path. This often causes problems... I highly recommend you don't put Qt in your PATH. You can break other apps on your PC that depend on a different version of Qt. @TonyRietwyk said in Qt 5.15.5 cannot load custom designer plugin: Turns out the problem was fixed by copying zlib1.dll into the 5.15.5\msvc2019\bin folder That should go into the folder which contains your plugin, not into your Qt folder. Again, I recommend you remove Qt from your PATH.

Hi For the scalable part. You must use Layouts from the very start. https://doc.qt.io/qt-5/layout.html

Usually, it's the bigger widget added that sets the overall size of the QTabWidget.

And just to add to @mrjj, no Makefiles. These kind of files should only exist in the build folder. If you have a duplicate in the project folder, it will drive you crazy.

In addition to what @jsulm, *.ui is XML format. If somebody is really crazy:) we can generate the XML also. But not required at all.

I know this answer is a bit late, but one solution that comes to my mind is to separate UI from logic. Create one file (e.g. a ui.qml file) for your UI and use it in another qml file.

After some tinkering, I've gotten the designer plugin to work the way I originally wanted. I simply commented out the 'module' directive in the 'qmldir' file: # module MyLib typeinfo plugin.qmltypes plugin MyLib ../ designersupported and added some qmake targets to automatically run 'qmlplugindump' post-build. So now my plugin directory structure looks like this: /imports |---MyLib.dll (or libMyLib.so) |---/MyLib |---|---qmldir |---|---plugin.qmltypes Now I can get the plugin to run in 'qmlscene': qmlscene -I <imports directory> <main qml file> There are only two caveats in this case. First, QML files that are to import anything from the library must first import 'MyLib 1.0' before importing anything else ('MyLib.Rectangle', 'MyLib.Circle', etc.). This is so that the plugin is loaded initially to populate the other imports. Secondly, this will produce the following message when the plugin is loaded: Module 'MyLib' does not contain a module identifier directive - it cannot be protected from external registrations. However in my case, this is not an issue and can be safely overlooked.

Hi Creator has a plugin folder for the designer plugin. On windows its C:\Qt\Tools\QtCreator\bin\plugins\designer

@mrjj Yes. The three are all in bin/gcc/debug/plugin/designer

Your scroll area doesn't have a layout. Remove the outermost nested vertical layout (verticalLayout_5) and use Layout in ... context menu to set the layout to your scroll area.

Qt Designer is included in Qt sources and works only for UI files. Qt Creator (the IDE) is a separate application and a separate project. You need to install or compile it first, for example from qt.io/downloads. Once you have Qt Creator installer, you need to open the settings, add your Qt Version, then add a so called Kit (which is Qt Version + compiler bundle), and then you are ready to go. If you want to avoid all that hassle, use the Qt installer from the link above - it will install Qt, Qt Creator, and set everything up for you, completely automatically.

@Pierone Can you put you code in GitHub instead of a rar file? Its pretty awkward to unpack your code.

Works fine for me too ;-) thx a lot @frodebj

I know this is an old questin, but at the time of writing, this is still the first hit on my search so hopefully this will help someone else. Promote it from a QGraphicsView as outlined on Stack Overflow, or compile the plug-in. https://stackoverflow.com/questions/48362864/how-to-insert-qchartview-in-form-with-qt-designer

@VRonin said in I can't figure out what size polices to use to get widgets laid out the way I want: what layouts are you placing in this widget? I'm using QGridLayout

Hi, AFAIK, yes, you need to set them in your widget constructor.

@Camilo-del-Real That worked. Thanks :)

@mrjj Got it , Thanks :)

@ronyNS Hi yes, i have such issue with image in QLabel and layouts. Try to clear it and see if its it :) also , just to test, if u make new project, does it allow to scale mainwin in designer?

Thanks for the hint.

Hi, While not necessarily recommended, you can use Qt's private API with the limitation that it might disappear in a future version so you're basically tied with the Qt version you build your application against. As for a solution on how to redirect everything through something else than QAbstractFileEngine, I'd recommend posting that question to the interest mailing list. You'll find there Qt's developers/maintainers. This forum is more user oriented.

I was thinking about the Splitting Up The Plugin which is the way to go when building an application using your custom designer plugin.

You're welcome ! Since you have it working now, please mark the thread as solved using the "Topic Tool" button so that other forum users may know a solution has been found :)

Yes, it works if I build a normal shared library an a designer plugin containing the widgets used by other plugins. The normal shared library is used to be linked to the other ones and the plugin is loaded into the designer to have the widgets available there.

@DougyDrumz Well it would be nice if one could just grab and drag to size them. maybe in 6.5 :)

Try to load another style of Qt. QApplication a; a.setStyle(QStyleFactory::create("Fusion")); Maybe then it will be more obedient.

It looks like it is not possible to connect a signal to a signal in the designer. You will need to do this in your code. But I would not do this in ui file! Because next time you use the designer it will be overwritten!

Hi @White_Rabbit, and welcome to the Qt Dev Net! I don't know if there's a way to change the display format of the editor. You can ask the Qt Creator engineers directly (and request the feature to set the editor's format) at the Qt Creator Mailing List: http://lists.qt-project.org/mailman/listinfo/qt-creator . Subscribe to the list and post there.

Thank you very much Chris

There must have a been a strange glitch at some point somewhere...

@predejtor said: Ahh that way. Thank you.

That's one situation that I haven't' see yet… AFAIK, you should be able to achieve that using the -qtlibinfix when building Qt yourself Thanks for sharing your finding !

@ChrisW67 i have tried your solution i have created user class and employee class by extending user class. but i can't access user class widgets. i have defined them as protected. can you show me correct way to do it?