Qt Qml Custom Window For Mac

Qt is the faster, smarter way to create innovative devices, modern UIs & applications for multiple screens. Cross-platform software development at its best. Qt Cross-platform software development for embedded & desktop. Qt5: GUIs with QtQuick and QML. Boudhayan Gupta. And Window, which is used to create the main application window in QML. QML components can be written in QML (remember that it s basically JavaScript; it s actually powered by Google s V8, so it s a full-blown programming language to work in) or C. To load a QML-based UI into a Qt.

I have upgraded my project from Qt 5.6.2 to Qt 5.9.4 Had a couple of issues on mac when I tried to build for the first time with the new Qt version, but nothing major. I have merged these changes and switched to Windows in order to try to build my project there as well. Unfortunately with no success due to some JS issues.It looks like QML's JS engine works differently on Mac and Windows from Qt 5.9.4 (maybe earlier versions as well, didn't try) then it did on Qt 5.6.2.Here is a small example, which demonstrates the root cause of my issue. Qml: type of KEY numberqml: KEY IS 2qml: OBJ KEY IS 5qml: #1 EVALUATING AS FALSEqml: #2 EVALUATING AS TRUEAnybody hit this issue before? What is happening here exactly? How can I trust QML's JS Engine after this?The original problem have arisen in my original project within a library.js file.

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I am using underscore.js in my QML project as a.js library, which have worked just fine with Qt 5.6.2 and works just fine with Qt 5.9.4 on Mac, but fails at the.find(.) function on Windows, which returns undefined always. As soon as I rename the function from.find to something else like.underscoreFind and change void 0 check to check it against undefined it works.This is the original implementation of.find.

• Status:Reported
• Resolution: Unresolved
• Fix Version/s: None
• Component/s:GUI: Painting, Quick: Core Declarative QML
• Labels:
• Environment:

QML gives inconsistent results when using High DPI configurations or custom DPI settings. We used the attached 'DesktopScaleFactor.qml' in the following examples.

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On Mac OSX, QML rectangles are properly scaled when switching to Retina setting. The attached 'osx_retina.png' screenshot shows double-sized rectangles compared to 'osx_normal.png', as we expect.

On Windows, when setting the 'Custom DPI Setting' to 200%, only the window border and the menu bar are scaled properly, while the rectangles keep their original size (as shown by 'win_100_percent.png' and 'win_200_percent.png' screenshots).

For the last screenshot ('win_200_percent_unaware.png'), we modified the Qt code to not call QWindowsContext::user32dll.setProcessDPIAware() in QWindowsContextPrivate. Then the rectangles are properly scaled (directly by Windows) and the menu bar looks blurry. This behavior is closer to what we want, since the content scaling is at least correct.

1. DesktopScaleFactor.qml

   0.5 kB

2. osx_normal.png

   23 kB

3. osx_retina.png

   66 kB

4. win_100_percent.png

   14 kB

5. win_200_percent_unaware.png

   38 kB

6. win_200_percent.png

   25 kB

QTBUG-37862Windows: All cursors are not DPI aware

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• Assignee:

  Morten Sørvig

  Reporter:

  Alain Martin

• Votes:

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• Created:

  Updated: