Category Archives: QT

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24
03
23
 2 Comments

Building QT6.4 for Windows with Vulkan support

Posted by | QT, Vulkan, Windows |

Installed Vulkan SDK and built QT6.4.2 for windows with the following script:

set PATH=C:\WINDOWS\system32;C:\WINDOWS

"C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" amd64

set MY_DRIVE=D:

%MY_DRIVE%
mkdir \dev\build\qt
cd \dev\build\qt
       
set "CMAKE_ROOT=%MY_DRIVE%\dev\tools\cmake-3.24.2-windows-x86_64\bin"
set "NINJA_ROOT=%MY_DRIVE%\dev\tools\ninja-win"
set "PERL_ROOT=%MY_DRIVE%\dev\tools\Strawberry\perl\bin"
set "PYTHON_ROOT=%MY_DRIVE%\dev\tools\Python35"
set VULKAN_SDK=%MY_DRIVE%/dev/tools/VulkanSDK/1.3.239.0
(more…)
17
03
23
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Black screen on starting QT Android app

Posted by | Android, QT |

I noticed this about five years ago and hoped that it had passed away, but a few days ago a user reported the following:

(more…)
11
01
23
 1 Comment

Building QT6.4.2 for MacOS and iOS

Posted by | iOS, Mac OS X, QT |

Build QT for MacOS separately in Debug and Release configuration:

tar xf qt-everywhere-src-6.4.2.tar.xz
cd ~/build/qt
export MY_QT_SRC_DIR=~/repos/qt-everywhere-src-6.4.2
export MY_MODE=release
#export MY_MODE=debug

export MY_INSTALL_PATH=~/libs/QT6.4/${MY_MODE}/MacOs
${MY_QT_SRC_DIR}/configure -prefix $MY_INSTALL_PATH -c++std c++20 -opensource -confirm-license \
  -static -static-runtime -${MY_MODE} -force-debug-info \
  -no-openssl -securetransport -DQT_NO_EXCEPTIONS=1 \
  -skip qt3d -skip qt5compat -skip qtactiveqt -skip qtcharts -skip qtcoap -skip qtconnectivity \
  -skip qtdatavis3d -skip qtdoc -skip qtlottie -skip qtmqtt -skip qtnetworkauth -skip qtopcua \
  -skip qtserialport -skip qtpositioning -skip qtquicktimeline -skip qtquick3d -skip qtremoteobjects \
  -skip qtscxml -skip qtsensors -skip qtserialbus -skip qtvirtualkeyboard -skip qtwayland \
  -skip qtwebchannel -skip qtwebengine -skip qtwebview -skip qtquick3dphysics -skip qtspeech -skip qtlocation \
  -skip qthttpserver \
  -- -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" \
  && cmake --build . --parallel \
  && cmake --install .
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21
12
22
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Touch target size on Android

Posted by | Android, QT |

Probably QT “Fusion” is not an appropriate style for Android apps, because its buttons height is not enough:

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11
12
22
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QT has Translation Rules for Plurals

Posted by | QT |

For example, there is the following content in qt-everywhere-src-6.4.1\qttranslations\translations\linguist_ru.ts:

<message numerus="yes">
    <source>Dropped %n message(s) which had no ID.</source>
    <translation>
        <numerusform>Удалено %n сообщение, у которого не было ID.</numerusform>
        <numerusform>Удалено %n сообщения, у которых не было ID.</numerusform>
        <numerusform>Удалено %n сообщений, у которых не было ID.</numerusform>
    </translation>
</message>
(more…)
11
12
22
 1 Comment

Building QT6.4.1 for Android on Windows

Posted by | QT |

Build QT6.4.1 for Windows and then build it for Android as follows:

set MY_DRIVE=D:

cd %MY_DRIVE%\dev\build\qta
%MY_DRIVE%
     
set "CMAKE_ROOT=%MY_DRIVE%\dev\tools\cmake-3.24.2-windows-x86_64\bin"
set "NINJA_ROOT=%MY_DRIVE%\dev\tools\ninja-win"
set "PERL_ROOT=%MY_DRIVE%\dev\tools\Strawberry\perl\bin"
set "MINGW_ROOT=%MY_DRIVE%\dev\tools\x86_64-12.2.0-release-win32-seh-rt_v10-rev0\mingw64\bin"
set "PYTHON_ROOT=%MY_DRIVE%\dev\tools\Python35"
set "JDK_ROOT=C:\Program Files\Android\Android Studio\jre\bin"
             
set PATH=C:\WINDOWS\system32;C:\WINDOWS
set PATH=%CMAKE_ROOT%;%PATH%
set PATH=%NINJA_ROOT%;%PATH%
set PATH=%MINGW_ROOT%;%PATH%
set PATH=%PERL_ROOT%;%PATH%
set PATH=%PYTHON_ROOT%;%PATH%
set PATH=%JDK_ROOT%;%PATH%
(more…)
10
12
22
 3 Comments

Building QT6.4.1 for Windows

Posted by | QT |

Extract QT sources:

cd /d/dev/repos
tar -xf ../distrib/qt-everywhere-src-6.4.1.tar.xz

Configure QT as follows:

"C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" amd64

set MY_DRIVE=D:

%MY_DRIVE%

cd %MY_DRIVE%\dev\build\qt
   
set "CMAKE_ROOT=%MY_DRIVE%\dev\tools\cmake-3.24.2-windows-x86_64\bin"
set "NINJA_ROOT=%MY_DRIVE%\dev\tools\ninja-win"
set "PERL_ROOT=%MY_DRIVE%\dev\tools\Strawberry\perl\bin"
       
set PATH=%CMAKE_ROOT%;%PATH%
set PATH=%NINJA_ROOT%;%PATH%
set PATH=%PERL_ROOT%;%PATH%
set PATH=%MY_DRIVE%\dev\tools\Python35;%PATH%
(more…)
10
12
22
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Translation of standard buttons text on Android in QT6

Posted by | QT |

Found the following code in qt-everywhere-src-6.4.0\qtbase\src\plugins\platforms\android\qandroidplatformtheme.cpp:

QString QAndroidPlatformTheme::standardButtonText(int button) const
{
    switch (button) {
    case QPlatformDialogHelper::Yes:
        return QCoreApplication::translate("QAndroidPlatformTheme", "Yes");
    case QPlatformDialogHelper::YesToAll:
        return QCoreApplication::translate("QAndroidPlatformTheme", "Yes to All");
    case QPlatformDialogHelper::No:
        return QCoreApplication::translate("QAndroidPlatformTheme", "No");
    case QPlatformDialogHelper::NoToAll:
        return QCoreApplication::translate("QAndroidPlatformTheme", "No to All");
    }
    return QPlatformTheme::standardButtonText(button);
}
(more…)
31
10
22
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QDebug can’t be used from a destructor of a static object

Posted by | QT |

We can’t do this in QT:

class Global
{
public:

    ~Global()
    {
        qDebug() << "Global destructor.";
    }
};

Global g;
(more…)
29
10
22
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QML Application Style

Posted by | QML, QT |

There was qtquickcontrols2.conf in the root directory of my app sources with the following content:

; This file can be edited to change the style of the application
; See Styling Qt Quick Controls 2 in the documentation for details:
; https://doc.qt.io/qt-6/qtquickcontrols2-styles.html

[Controls]
;Style=Default
;Style=Universal
;Style=Material
Style=Fusion
;Style=iOS

[Universal]
Theme=Light
Accent=Steel

[Material]
;Theme=Light
Theme=Dark
;Accent=BlueGrey
;Primary=BlueGray
(more…)
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