General and Desktop

• 

  How to create the plugin of MYSQL for Qt
  • BlackStar  

  34
  4
  Votes
  34
  Posts
  27175
  Views

  

  @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 ]
• 

  Reporting inappropriate content on the forums
  spam • • Eddy  

  27
  2
  Votes
  27
  Posts
  13284
  Views

  

  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.
• 

  UNSOLVED Different look of the main form.
  • Sabbjorn  

  3
  0
  Votes
  3
  Posts
  12
  Views

  

  @Sabbjorn said in Different look of the main form.: I don't want frames from a standard windows window ... no frames or edges. Seems you want a frameless window like this: https://forum.qt.io/topic/98385/does-qt-support-mac-style-pop-out-widgets/4
• 

  UNSOLVED overwriting inherited stylesheet properties
  • jon-h  

  2
  0
  Votes
  2
  Posts
  5
  Views

  

  Well, works on my app. How about changing that to: "border-width: 0px"
• 

  UNSOLVED QTreeView: specify distance between branch image and text/decoration
  c++ qtreeview styles • • hoafaloaf  

  3
  0
  Votes
  3
  Posts
  13
  Views

  

  @JonB Thanks for the suggestion, but I did check that out -- it looks like setIndentation()/indentation() only deals with the space to right of the expand/collapse arrow (i.e., the ::branch subcontrol). Any other ideas? :)
• 

  UNSOLVED QSqlDatabase: QMYSQL driver not loaded and not available
  • mturner  

  3
  0
  Votes
  3
  Posts
  4
  Views

  

  Hi, for recent Qt versions, the mysql plugin is no longer provided due to license problem of libmysql. You will need to build your own. Please refer to the doc: https://doc.qt.io/qt-5/sql-driver.html#how-to-build-the-qmysql-plugin-on-unix-and-macos Or you can use older versions of Qt.
• 

  UNSOLVED How to display .dds files
  qimage qpixmap dds • • Matthieuzone  

  2
  0
  Votes
  2
  Posts
  8
  Views

  

  Hi and welcome to devnet, Are you locked to that old version of Qt ? If not, then please update to either the current version or the latest LTS. It depends on where that code is. You can simply build only the module that contains it.
• 

  UNSOLVED How can I disable highlight of selected items, but still leave selection mode enabled in a QTreeView?
  • MattCleere  

  5
  0
  Votes
  5
  Posts
  30
  Views

  

  @MattCleere But without the highlight color, how can you know which rows are selected? I can simply disable the highlight color by QStyleOptionViewItem myOption = QStyleOptionViewItem(option); myOption.state &= ~QStyle::State_Selected; QStyledItemDelegate::paint( painter, myOption, index ); But I'm not sure whether this is what you want.
• 

  UNSOLVED mouseEvent->localPos() yields wrong coordinates and enter/leave events to not function properly
  • ThePhysicist  

  2
  0
  Votes
  2
  Posts
  5
  Views

  

  Hi and welcome to devnet, Why the event filter ? This seems overkill for your purpose. Why are you handling the focus and mouse move event of all other widgets in this one ? In any case, why don't you call the base class implementation in it ?
• 

  UNSOLVED GUI update signal
  • Q139  

  7
  0
  Votes
  7
  Posts
  37
  Views

  

  Changing a variable in some random class does not mean Qt has to trigger any refresh. You can call the update method of the widget you just modified.
• 

  UNSOLVED Help needed: Creating Object from classes
  • veixeros  

  8
  0
  Votes
  8
  Posts
  21
  Views

  

  What will that button do ?
• 

  UNSOLVED Using QWindowsVistaStyle with QML (making Qt apps look more "native" in Windows)
  • ingrown  

  1
  0
  Votes
  1
  Posts
  6
  Views

  No one has replied

• 

  UNSOLVED font size changes and its too big
  • xdma  

  1
  0
  Votes
  1
  Posts
  9
  Views

  No one has replied

• 

  UNSOLVED How to properly subclass QSqlRelationalTableModel to set background color of cells in QTableView
  • And92  

  9
  0
  Votes
  9
  Posts
  47
  Views

  

  @And92 said in How to properly subclass QSqlRelationalTableModel to set background color of cells in QTableView: Lastly, unfortunately, I do not understand what You are speaking about "role". My thought is that with switch, Qt::BackgroundRole, Qt::BackgroundRole, case Qt::ForegroundRole:, case Qt::DisplayRole:, case Qt::TextAlignmentRole: and return QSqlQueryModel::data(index, role); in default: I handle all the cases of all possible values of "role", don't I? You do indeed in your data() override method. But you also have to deal with these in setData()! setData() has a role parameter just like data() does, and you need to act on it. And call the base QSqlQueryModel::setData() for those cases you do not handle, just like you call QVariant value = QSqlQueryModel::data(index, role) during data().
• 

  UNSOLVED Vectorization support
  • Q139  

  1
  0
  Votes
  1
  Posts
  12
  Views

  No one has replied

• 

  SOLVED signals from worker object never reach controller object?
  • davecotter  

  10
  1
  Votes
  10
  Posts
  106
  Views

  

  my apologies for the extra goose-chasing. the suggestion by @KroMignon was in fact correct, i had mistyped it in a way that did compile but was incorrect, so my conclusion was wrong. thanks everyone for your great help!!!
• 

  UNSOLVED Qt QGraphicsView OpenGL viewport issue
  • mccat  

  3
  0
  Votes
  3
  Posts
  19
  Views

  

  It doesnt contain any buttons because i decided to create minimal example (from the zero) without unnecessary things. if you compile code i showed in previous message you will get exatly the same effect.
• 

  SOLVED Get DC from QPaintEngine
  • lucbaz  

  9
  0
  Votes
  9
  Posts
  73
  Views

  

  Thank you so much for your help.
• 

  UNSOLVED Borderlayout resizing elements
  • jkwok678  

  1
  0
  Votes
  1
  Posts
  8
  Views

  No one has replied

• 

  UNSOLVED Do I need to use the Q_OBJECT macro if I only use slots?
  • Fleshbits  

  9
  0
  Votes
  9
  Posts
  55
  Views

  

  @sierdzio said in Do I need to use the Q_OBJECT macro if I only use slots?: Q_OBJECT is necessary for QMetaObject stuff to work (like inherits(), className() etc.). More important than reflection, though, I'd put qobject_cast, which does require Q_OBJECT (i.e. meta-object information).
• 

  SOLVED Implementing plugin dependencies
  linux plugins libraries dependencies linuxdeployqt • • Martyn McFarquhar  

  13
  0
  Votes
  13
  Posts
  93
  Views

  

  The only drawback is that 3rd-party modules cannot depend on one another unless they are submitted for inclusion in the core pool of modules. But it seems like this is just the price to pay for this kind of system? Sorry for the long delay, I was traveling and had no time to actually look at the forum. Yes, I would say that your summary is correct, and in that light I'd say what @VRonin had suggested as a way to build up the dependencies is probably best. That is - you have a set of core libraries that provide whatever they provide (which was what @SGaist mentioned in passing) and you stick to runtime loaded plugins being self-contained units that can't and/or won't depend on one another.
• 

  UNSOLVED Setting QSS font-size and varying DPIs
  • J.Andre  

  5
  0
  Votes
  5
  Posts
  22
  Views

  

  @J-Andre I would imagine specifying in pt has to scale on a monitor hence the fuzziness, where px would fit exactly?
• 

  UNSOLVED Compare QVariant in Qt6
  qt6 deprecated • • autoantwort  

  2
  0
  Votes
  2
  Posts
  19
  Views

  

  Hi, Do you mean compare them for equality ?
• 

  UNSOLVED QTableView display data in millimeter or inch
  • addebito  

  7
  0
  Votes
  7
  Posts
  25
  Views

  

  You can create a widget that contains a QLineEdit and serves as proxy.
• 

  UNSOLVED [PyQt5] Allow QMediaPlayer to read from QBuffer()
  • Elus  

  9
  0
  Votes
  9
  Posts
  23
  Views

  

  @jsulm Is this the cause of the problem? https://bugreports.qt.io/browse/QTBUG-69101
• 

  UNSOLVED Yes... it's that question again.. Progress bar colours
  • Stevolution  

  1
  0
  Votes
  1
  Posts
  14
  Views

  No one has replied

• 

  UNSOLVED QSortFilterProxyModel and QTreeView
  • Qt.Jo.Ha  

  5
  0
  Votes
  5
  Posts
  37
  Views

  

  You currently have source model -> your proxy model -> QSortFilterProxyModel -> view. Any chance you can instead do source model -> QSortFilterProxyModel -> your proxy model -> view ? i.e. filter before applying the transformation. The most desired structure is data - QSortFilterProxyModel - QIdentityProxyModel but Crash occurs due to incorrect mapping in QSortFilterProxyModel In 99.9999999% of the cases this is due to the implementation of your custom proxy not respecting the strong QAbstractItemModel contract. I made a model that inherited the QIdentityProxyModel Interesting. I'm actually the original aouthor of QTransposeProxyModel (that basically does the same thing but to the entire model, not only to the children) and I'm pretty sure (and the maintainer of the model-view infrastructure agrees with me) that transformation cannot be done unless: you modify the Qt internals to add your custom proxy as a friend of QAbstractItemModel you pass an invalid index to QIdentityProxyModel::mapToSource See this discussion aiming to provide a solution to the problem in Qt6
• 

  UNSOLVED Undefined size when drawing a foreground in QGraphicsView?
  • johnratius  

  5
  0
  Votes
  5
  Posts
  28
  Views

  

  I found that using 0 as the start for X and Y draws it successfully, but it starts in the middle of the screen which is what I don't want. Does anyone have any suggestions?
• 

  This topic is deleted!
  • Eli_a_n  

  3
  0
  Votes
  3
  Posts
  30
  Views
• 

  UNSOLVED Prepared QSqlQuery doesn't execute as expected.
  • trumperycurl  

  2
  0
  Votes
  2
  Posts
  12
  Views

  

  @trumperycurl What does https://doc.qt.io/qt-5/qsqlquery.html#lastError tell you? Also, why do you put the ID in ''?
• 

  UNSOLVED QGraphicsSVGItem ignores (some) clipping paths. Why?
  • Nicoco  

  1
  0
  Votes
  1
  Posts
  6
  Views

  No one has replied

• 

  UNSOLVED how to call function in main.cpp in qt ( i am using Qt Console Application)
  • SBM_RC  

  5
  0
  Votes
  5
  Posts
  13
  Views

  

  i got it but should use class of 1.cpp and call function ex: CAS w; w.foo();
• 

  UNSOLVED Window geometry
  • SPlatten  

  14
  0
  Votes
  14
  Posts
  23
  Views

  

  Please see the image below: To create this window my xml looks like this: <window id="win1" frameless="false" fullscreen="false" modal="true" x="10%" y="10%" width="25%" height="30%" properties="color: #000000; modal:true; maximize:false; minmax:false; minimize:false;" resizeable="true" title="win1:Hello World"> <frame id="frm1" x="2%" y="2%" width="96%" height="96%" properties="QFrame {background-color: #e9efef; background-image: url('meshtile_4x4.png'); border: 2px solid #cccccc; border-top-left-radius: 8px; border-top-right-radius: 8px; border-bottom-left-radius: 8px; border-bottom-right-radius: 8px;}"> </frame> </window> The frame is position attributes x and y work reliably and use the container geometry to work out the position: clsXMLnode* pobjParent = pobjGetGUIParent(); if ( pobjParent != nullptr ) { QRect rctParent = pobjParent->rctGetGeometry(); if ( pobjParent->blnIsWindow() == true ) { int intTitleBarHeight = QApplication::style()->pixelMetric(QStyle::PM_TitleBarHeight); rctParent.setHeight(rctParent.height() - intTitleBarHeight); } int intParentValue; switch( intGeomIdx ) { case scintHeight: case scintY: intParentValue = rctParent.height(); break; case scintWidth: case scintX: intParentValue = rctParent.width(); break; default: intParentValue = -1; } if ( intParentValue >= 0 ) { double dblPercent = strValue.mid(0, intPercent).toDouble(); intValue = static_cast<double>(intParentValue) * (dblPercent / 100.0); blnValid = true; } } The above is just a small snippet of how it calculates the differences in height and width. As the screenshot shows the width and height are set to 96%, the vertical bottom margin between the inner frame and the window doesn't look correct it looks. Can anyone suggest why this might be the case? This screen shot is without the css borders just to see if they were the problem, they were not and as its obvious the bottom border is still to large.
• 

  UNSOLVED Where to put own functions for use in several classes
  • Philipp DE  

  5
  0
  Votes
  5
  Posts
  38
  Views

  

  Or using a namespace. namespace MyVeryUsefullFunctions { inline int Cube(int n ) { return n*n*n; } } ... using namespace MyVeryUsefullFunctions; int c=Cube(10);
• 

  UNSOLVED Raspberry pi App works correctly from SSH but not from local command line
  raspberry pi ssh qxcbintegration • • Eli_a_n  

  3
  0
  Votes
  3
  Posts
  12
  Views

  

  @jsulm said in Raspberry pi App works correctly from SSH but not from local command line: window manager hi, Thank you for the fast reply. Fairly new to raspberry pi. What i did was to : download a full image of Buster and flash it on a sd card; Boot to Desktop Install qt following this tutorial : https://www.kampis-elektroecke.de/raspberry-pi/qt/ Run App from ssh Run app from raspberry pi command line (not ssh) How can i check for window manager ? Thank you
• 

  SOLVED qwt plot in QWidget is badly scaled
  • JohnCu  

  4
  0
  Votes
  4
  Posts
  26
  Views

  

  If you set it up correctly, it will be managed by Qt's parent/child hierarchy and you won't need to delete it in the destructor.
• 

  UNSOLVED Qmovie does not show gif images in Mac
  • zandarina  

  9
  0
  Votes
  9
  Posts
  34
  Views

  

  The structure of the app bundle on osX has nothing to do with an application on Windows. Either you shall copy the file in the right place in the bundle or depending on its size and use store it using the Qt Resources System.
• 

  UNSOLVED QProgressBar, custom text position through stylesheet?
  • JulienMaille  

  1
  0
  Votes
  1
  Posts
  14
  Views

  No one has replied

• 

  This topic is deleted!
  • FluentCoding  

  1
  0
  Votes
  1
  Posts
  8
  Views

  No one has replied

• 

  UNSOLVED Single QTreeView with few QStandardItemModel
  • Please_Help_me_D  

  6
  0
  Votes
  6
  Posts
  37
  Views

  

  I'm trying to use QStandardItemModel with QStandardItem. Some of QStandardItem I make QStandardItem::setCheckable(true); Then I I have filled with items QStandardItemModel and I use two proxy models with QSortFilterProxyModel::setSourceModel When I display those two proxy models in QTreeView I can see those checkable items. But if I change checkStatus in one of those two proxy models then the other this item in other proxy model also changes checkStatus. Is there a way to make items checkStatus in proxy models independent from checkStatus of those items in other proxy model? All other properties of items (like title) from different models should be equal. I understand that both my proxy models are based on the data from one QStandardItemModel but maybe there is the solution for this?