General and Desktop

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  How to create the plugin of MYSQL for Qt
  • BlackStar

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  @flydragon

  Do not duplicate posting because you do not get an answer immendiately.

  [edit:koahnig see https://forum.qt.io/topic/82629/why-qsqlquery-exec-exit-failed ]

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  Reporting inappropriate content on the forums
  spam • • Eddy

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  Thank you for the report. I have banned the user, which got rid of the spam posting. Not a loss, as this user did not post any other content on the site. Just deleting this one posting was not possible.

  Thanks for reporting this.

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  Unsolved frame won't stretch in vbox layout
  • HamishM

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  @HamishM
  Hi
  0,0 means split equally.
  you want something like else
  

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  Unsolved Position of images of QImages in QTextDocument.
  • DrZod

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  Unsolved QSortFilterProxyModel is sorting only on based on string.
  • Ayush Gupta

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  @Ayush-Gupta said in QSortFilterProxyModel is sorting only on based on string.:

  @sierdzio said in QSortFilterProxyModel is sorting only on based on string.:

  You can add a custom role to your model (you need to return it in data() method of your model) and check it in your filter proxy.

  Can you expalin this further. How I can achieve this. May be a peice of code explaining this?

  If you have a custom subclass for your model (do you?), you can do this:

  // In some header enum CustomRole { ColumnHasNumbers = Qt::UserRole + 1 } // In model: QVariant YourModelClass::data(const QModelIndex &index, int role) const { switch (role) { case Qt::DisplayRole: // ... case Qt::EditRole: // ... case ColumnHasNumbers: // You need to detect which column has only numbers either here (inefficient) or somewhere else, for example during initialization of the model if (columnHasNumbers) return true; else return false; }
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  Unsolved Qt VirtualKeyboard in Widgets applications cover other widgets ?!
  virtualkeyboard qtvirtualkeyboa qtwidgets inputmethod • • IMAN4K

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  Unsolved application hang
  • LeLev

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  @kshegunov said in application hang:

  However it seems your statement is not correct - you're not touching the object from the preProcessFile function

  i do
  items.append(PosItem(x, y, i, j, arc, cw, mm, index)); items is member, and :
  processGCode(strline, x, y, i, j, arc, cw, mm, g) it is member methos also

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  Unsolved Qt App for mjpeg stream from rasperry camera
  • gblessed

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  @gblessed said in Qt App for mjpeg stream from rasperry camera:

  QWebEngine

  It needs to be installed separately as it is not part of default setup. Start the Qt Maintenance Tool go to the Qt version you're using and select "Qt WebEngine" there.

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  Unsolved How to solve an issue with same file names and qmake
  • Besajia

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  Unsolved QTreeWidget is too laggy during simple item hover (2-3 elements, 3 columns)
  • Wdowiak

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  @jsulm Just created a fresh app with QTreeWidget and 5 random elements, and it seems to be working fine (UI thread usage ~10%-20% during hovering)

  @SGaist
  hey,
  I am using 5.13, but I have also tried changing Qt path in CMake to 5.12, same result.
  Windows 10 Pro, 1903
  GammaRay is compiling as we speak. Will definitely give it a try.

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  Unsolved Update the QCompleter when calling QLineEdit::setText
  • Kerndog73

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  @Kerndog73 said in Update the QCompleter when calling QLineEdit::setText:

  Do you have any ideas for the main problem?

  No. I would actually expect this to work as home path is under root.

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  Unsolved using Treeview of qml in Qt5.13.0 make errors
  • jimfar

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  @jimfar Did you debug your app? When does it happen? What does your app do when it happens? I doubt anybody can tell why this happens without more information.

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  Solved dumpcpp.exe not working properly on clsid.
  • Ketan

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  @hskoglund It Workds. Thank you!

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  Unsolved Qt Programming Language
  • Annabelle

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  @Annabelle said in Qt Programming Language:

  What's the \240 character? I'm confused on that one!

  As I mentioned before, it is a specially-formatted character that represents a space.

  There are many ways to represent text: Sighted people draw lines to represent a character, Braille users arrange dot patterns to represent a character, while computers use a number to represent a character. For example, computers represent 'A' as the number 65, 'B' as the number 66, and so on.

  In computers, there are multiple ways to represent a space. \240 is one such representation. Unfortunately, this representation causes problems for your compiler when it is pasted into your IDE.

  Since it is a space character, I doubt that your screenreader will read it out. Sighted people can't see the bad character on the screen either.

  The easiest thing to do is to erase the offending line from your code and re-type the whole line by hand.

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  Unsolved Error using foreach
  • frnklu20

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  @frnklu20 said in Error using foreach:

  (DiagramItem *)item;

  Should this be done this way?

  DiagramItem *itempos = dynamic_cast<DiagramItem*>(item); // check if itempos is null

  This gives us some more type safety no?

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  Unsolved PythonQt cannot Build
  • plloppii

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  @SGaist

  So I tried running a different example script, and I am getting this:

  /home/plloppii/Qt/5.13.0/gcc_64/bin/qmake -o Makefile ../PyLauncher/PyLauncher.pro -spec linux-g++ CONFIG+=debug CONFIG+=qml_debug g++ -Wl,-rpath,/home/plloppii/Qt/5.13.0/gcc_64/lib -o ../../lib/PyLauncher_d main.o -L/usr/lib/python2.7/config-x86_64-linux-gnu -L/usr/lib -lpython2.7 -ldl -lutil -lm -Xlinker -export-dynamic -Wl,-O1 -Wl,-Bsymbolic-functions -L../../lib/../lib -lPythonQt-Qt5-Python2.7_d -lPythonQt_QtAll-Qt5-Python2.7_d /home/plloppii/Qt/5.13.0/gcc_64/lib/libQt5Widgets.so /home/plloppii/Qt/5.13.0/gcc_64/lib/libQt5Gui.so /home/plloppii/Qt/5.13.0/gcc_64/lib/libQt5Core.so -lGL -lpthread /usr/bin/ld: cannot find -lPythonQt-Qt5-Python2.7_d /usr/bin/ld: cannot find -lPythonQt_QtAll-Qt5-Python2.7_d collect2: error: ld returned 1 exit status Makefile:267: recipe for target '../../lib/PyLauncher_d' failed make: *** [../../lib/PyLauncher_d] Error 1 14:36:53: The process "/usr/bin/make" exited with code 2. Error while building/deploying project PyLauncher (kit: Desktop Qt 5.13.0 GCC 64bit) When executing step "Make" 14:36:53: Elapsed time: 00:01.

  I cant seem to get through this error... It isnt asking me for the GL library anymore, but PythonQt-Qtall files.

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  Unsolved Help with Technical Guide/Keyboard Styles
  • Circuits

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  Unsolved Auto play video files in tablewidget
  • Megamouse

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  Hi,

  If you mean as using the decoration role, then no, you'll have to implement that yourself.

• 

  This topic is deleted!
  • Circuits

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  Solved How to get QMetaMethod from Object::method?
  • kitfox

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  @kitfox said in How to get QMetaMethod from Object::method?:

  Given I have a QObject inheriting object called Foo with a method on it called bar, what's the easiest way to get a QMetaMethod object that represents Foo::bar?

  From the docs:

  int functionIndex = qobj.metaObject()->indexOfMethod("testFunc()"); QMetaMethod mm = qobj.metaObject()->method(functionIndex);

  https://doc.qt.io/qt-5/qmetamethod.html
  https://doc.qt.io/qt-5/qmetaobject.html#indexOfMethod
  https://doc.qt.io/qt-5/qmetaobject.html#normalizedSignature

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  Unsolved QComboBox specify width less than content
  • JonB

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  @SGaist
  Errr, the guy who told me would be running Windows 10.

  He told me the long text got shortened, I think with ellipsis at the right-hand side, I guess so that the text wouldn't overspill the combo width. In my Linux/GNOME, the dropdown just completely overwrites the combo and is wide enough to accommodate any text. The Windows one might constrain the dropdown to be "inside" the combo, I don't know. This may of course be windowing behaviour, nothing to do with Qt, unless there is some style I can set.

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  Unsolved symbol(s) not found for architecture x86_64
  • TheCipo76

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  You should rather use Apple Clang as the compiler

  @SGaist Good point - I missed that one.

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  Unsolved Add intel ipp in Qt 5.9 windows
  • ahmad ezoji

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  Hi and welcome to devnet,

  What compiler are you using with Qt ?
  What compiler was used to build IPP ?

• 

  Unsolved JavaScript in QTextEdit?
  • adamsmith

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  @adamsmith
  I wonder just what you intend to do with your JavaScript in a QTextEdit?

  A QWebEnginePage would allow you JavaScript, see https://doc.qt.io/qt-5/qwebenginepage.html#runJavaScript. I don't know if that is an alternative to a QTextEdit for your use case.

• 

  Unsolved Table proxy model for list view
  model view proxy • • Patrick Wright

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  After thinking about this problem more and looking at the interface for QAbstractProxyModel, I am beginning to think that a subclass of a proxy model is not the answer. I am wondering if the best course of action would be to create a new model which keeps a pointer to my base model. Every time the various data changed signals are emitted from the base model, my "proxy" model determines if a new sequence has been found. It then keeps track of all the various sequences in its own internal data structure which keeps QPersistenModelIndex indexes into the base model. Then my "proxy's" data() method would use these indexes to get the real data from the underlying model but parsed into the correct format.

  Do this sound like a better approach?

  In this case, I am also wondering how to display my data as a table where each row could have a different number of columns. Perhaps I could keep track of the row with the maximum number of columns and return this in columnCount()? Then my data() method would just return QVariant() for columns that don't exist in a given row.

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  Solved What is this .qbs:3 file?
  • Circuits

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  @Circuits No problem, glad you figured it out :)

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  Unsolved Icon in QComboBox is not visible
  • krzysieklfc

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  @SGaist Thanks. This solution seems to work pretty nicely. I have set QComboBox to my custom QLineEdit and styled it to appear transparent.

  The only thing that is bothering me now is that QComboBox automatically offsets it's lineedit as soon as an icon entry is added.

  What can I do about that?

• 

  Unsolved Work around for changing tool button's background color
  • Omni_Philm

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  @mrjj

  Oops, forgot to include that line in the example:

  but

  tempText = opt.text;

  Edit:

  here is the full drawing code:

  QString tempText; QStylePainter p(this); QStyleOptionToolButton opt; initStyleOption(&opt); tempText = opt.text; opt.text = QString(); p.save(); p.drawComplexControl(QStyle::CC_ToolButton, opt); p.setBrush(QColor(255,0,0,100)); p.setPen(Qt::NoPen); p.drawRect(4,4,width()-8,height()-8); // p.setBrush(QColor(0,0,0)); p.setPen(QColor(0,0,0)); p.setFont(this->font()); p.drawText(this->frameGeometry(), Qt::AlignCenter, tempText); p.restore();
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  Solved Can't Compile connect method
  • theroark

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  Hey all, @JKSH @SGaist @mrjj,

  Thanks, It worked!!!!

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  Unsolved Language Translation - Make translation empty ?
  • dheerendra

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  @Ketan "unfinished" is just an internal reference for translators to know that the word/phrase still needs translation (even if a value is provided, it might not be definitive)

  @dheerendra said in Language Translation - Make translation empty ?:

  wherever "Why" text exist, I would like to display nothing. I would like to display blank. Is this possible ?

  Have you tried your approach? It should work, Qt will show return whatever you assigned to the translation for the "Why" entry.

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  Unsolved Alter virtual keyboard styles without editing Qt source
  • Circuits

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  Perhaps there is some way I could pull the styles folder into my project? For instance, could I copy say the retro style and paste it into my project and then reference the folder that's inside the project instead of the one located @ src/virtualkeyboard/content? We don't want to have to alter Qt source code as this GUI application could be used on a different project or on a different platform. Which would mean that the change made here would have to be made there as well and potentially anywhere where Qt is being used.

  This does not seem to be working but I could be doing it wrong. I tried adding the retro style to one of my projects but I renamed it test and made the alterations as shown in the technical guide for adding a custom style. Then in main I tried referencing the new location:

  qputenv("QT_VIRTUALKEYBOARD_STYLE","qrc:/test");

  also tried:

  qputenv("QT_VIRTUALKEYBOARD_STYLE",":/test/");

  and

  qputenv("QT_VIRTUALKEYBOARD_STYLE","~/home/rob/untitled/test");

  however; each time I try it tells me that it cannot find the location:

  WARNING: Cannot find style "~/home/rob/untitled/test" - fallback: "default"
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  Solved After copying the file Qt-th can not change the file.
  • Mikeeeeee

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  Hi
  Yes if dbAdress is the new location on the disk. it should work.

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  Unsolved Multiple app icons on launch bar for single Qt app
  • dalishi

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  hi
  Seems you just want.

  MainWindow w(domain_id); if (ok) { // ok pressed w.show(); } else { // do nothing } return a.exec();
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  Solved Convert QString hex to Float
  • Babs

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  @Babs So please mark this topic as SOLVED then. Thanks!

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  Unsolved Best way to use "change styleSheet..." in Qt Designer?
  • mjsmithers

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  Hi
  Stylesheets are cascading by nature so they will affect child widgets if the selector matches,
  The best way to control it is by using one stylesheet on the application. and never used
  broad selectors like QWidget unless you really mean it.

  While developing the stylesheet i set it on the MainWindow as its top parent and own most of the widgets.

• 

  Unsolved Printing large images
  • DrZod

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  @DrZod Can you try with the latest stable Qt version (Qt 5.13)? 5.9 is quite old.

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  Unsolved [Bug] Why QDialog display empty rarely.
  • brucezcg

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  @brucezcg
  Hi
  maybe a rare driver bug. :)

  In any case, if possible you should test if a new driver helps on your college's PC.

• 

  Unsolved QtQuick 2 and paint()
  • Luckless

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  @Luckless said in QtQuick 2 and paint():

  @sierdzio
  We tried using QQuickPaintedItem and its paint function. We also called update whenever any change was made. But the paint function was not being invoked. If there is something that we are missing please tell.

  Make sure you set ItemHasContents flag https://doc.qt.io/qt-5/qquickitem.html#Flag-enum

  Also the QQuickPaintedItem documentation quotes "This function, which is usually called by the QML Scene Graph, paints the contents of an item in local coordinates.". I am guessing this means a scene graph is required for using the paint() method.

  Yes Scene Graph is needed but you don't need to use it. You just pain using QPainter and QML engine does the rest.

  Your application uses QML, right? And this item is part of some QML scene? Or you are using it in some less conventional environment?

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  Unsolved retractable side panel
  • federico.massimi

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  @VRonin
  this is very interesting.

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  Unsolved Enumeration of the rows(Vertical Header) is not aligned horizontally with data in the table
  • Ankita thakur

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  Hi

  QT version: 5.11 and its on Windows.
  What do you mean by setting up QTable View? What information is needed for this??
  Made a member of QTable view and added a QAbstractTableModel as its model.

  Setting up the row count and column count for the table using the model. Using header data to set the column headers and row numbers:
  QVariant DINModel::headerData(int section, Qt::Orientation orientation, int role) const {
  if (role != Qt::DisplayRole)
  return QVariant();

  if (orientation == Qt::Horizontal) { switch (section) { case portType: return "Port"; break; case labelType: return "Event Label"; break; case dinType: return "Digital Input"; break; } } else { return QString("%1").arg(section + 1); } return QVariant();

  }