Hi
http://doc.qt.io/qt-5/qtbluetooth-index.html
Do you have BlueZ 4.x/5.x installed ?

Hi again !
It seems that by looking still a bit more I found a suitable answer.
The key was to set the QSqlRelationalDelegate for the mapper and not the QComboBox but still setting the model of the QComboBox to the table containing all the functions.

Here is my final code:

//Init all private members //Init all private members price1 = new QDoubleSpinBox(this); price2 = new QDoubleSpinBox(this); price3 = new QDoubleSpinBox(this); price4 = new QDoubleSpinBox(this); function = new QComboBox(this); mapper = new QDataWidgetMapper(this); sqlModel = new QSqlRelationalTableModel(this); QSqlTableModel *fctModel = new QSqlTableModel(this); QListView *articlesView = new QListView(this); //Imediately links the views and the models sqlModel->setTable("Articles"); //A few indexes int nameIndex = sqlModel->record().indexOf("Name"); int priceIndex = sqlModel->record().indexOf("sellPrice"); int jobShareIndex = sqlModel->record().indexOf("jShare"); int bPriceIndex = sqlModel->record().indexOf("bPrice"); int redPriceIndex = sqlModel->record().indexOf("reducedPrice"); int functionIndex = sqlModel->record().indexOf("function"); int functionNameIndex; { auto tmp = new QSqlTableModel(); tmp->setTable("Functions"); functionNameIndex = tmp->record().indexOf("name"); delete tmp; } //Configures the sql model sqlModel->setRelation(functionIndex, QSqlRelation("Functions", "Id", "name")); sqlModel->setEditStrategy(QSqlTableModel::OnFieldChange); sqlModel->select(); //Views articlesView->setModel(sqlModel); articlesView->setModelColumn(nameIndex); //Sets the column to the name articlesView->setEditTriggers(QAbstractItemView::NoEditTriggers); function->setModel(sqlModel->relationModel(functionIndex)); function->setModelColumn(functionNameIndex ); //Mapper mapper->setModel(sqlModel); mapper->addMapping(price1, priceIndex); mapper->addMapping(price2, bPriceIndex); mapper->addMapping(price3, jobShareIndex); mapper->addMapping(price4, redPriceIndex); mapper->addMapping(function, functionIndex); mapper->setItemDelegate(new QSqlRelationalDelegate(mapper)); mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);

I hope that it will be able to help anybody who might encounter that same problem !
Happy new year everybody, take care ! :)

Define your variables via cpp.defines and use from C++.

So my final solution is:

class SqlRelationalDelegate : public QSqlRelationalDelegate { Q_OBJECT public: StorageSqlRelationalDelegate(QObject* parent = nullptr) : QSqlRelationalDelegate(parent) {} QWidget* createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const override { editor = QSqlRelationalDelegate::createEditor(parent, option, index); return editor; } void destroyEditor(QWidget* editor, const QModelIndex& index) const override { QSqlRelationalDelegate::destroyEditor(editor, index); this->editor = nullptr; } QWidget* getEditor() const { return editor; } private: mutable QWidget* editor = nullptr; }; ... class TableView : public QTableView { Q_OBJECT public: StorageTableView(QWidget* parent = nullptr) {} void openPersistentEditor(const QModelIndex &index) { QTableView::openPersistentEditor(index); emit persistentEditorOpened(index); } signals: void persistentEditorOpened(const QModelIndex &index); }; ... connect(view, &TableView::persistentEditorOpened, [view] (const QModelIndex& index) { auto model = view->model(); auto delegate = qobject_cast<SqlRelationalDelegate*>(view->itemDelegate(index)); if (!delegate) qFatal("Delegate cast error"); delegate->setModelData(delegate->getEditor(), model, index); });

@VRonin
Ah. I believe the user described the interface he gets currently (with his QTableView). Whether he likes it or not is a different matter.

Then his question was: how does he get a notification when, having created a new row, it is actually sent to the database for INSERT, given that there is no signal for this in his case ("editStrategy is OnFieldChange").

My overriding QSqlTableModel::insertRowIntoTable() is how to achieve that. So yours is to do with the interface for adding a new row, right? Whether he would benefit/prefer to change over to that to I cannot say :)

Hi,

Might be a silly question but are you linking your .dll against Qt's widgets module ?

@raven-worx you sir saved my life! I cant believe i was stuck at this for 2 days, when it was simply just about using the right object in qml. thanks!

What's the problem replacing the QSpinBox with a QComboBox in the example? Did you even try?

Did you find something about that ? I'm also interested by subscriptions in Qt Purchasing

@SGaist
Thank you so much! Your response was much helpful!

Before crossing that feature definitively, I'd recommend asking on the interest mailing list. You'll find there Qt's developers/maintainers. This forum is more user oriented.

@Cleiton-Bueno Thank you very much for providing me more information on the Yocto language selection.

Hi,

Thanks !

@Paul-Colby Thanks

i myself did something like this :)

QVariantMap json_map; const QJsonDocument doc = QJsonDocument::fromJson(output); qDebug().noquote() << doc; qDebug().noquote() << doc.array(); foreach (auto value, doc.array()) { qDebug().noquote() << value; qDebug().noquote() << value.toObject(); qDebug().noquote() << value.toObject().value("name"); json_map["name"] = value.toObject().value("name").toString(); json_map["installed"] = value.toObject().value("installed").toBool(); json_map["id"] = value.toObject().value("id").toString(); json_map["filename"] = value.toObject().value("filename").toString(); }

@SGaist

I found the solution in the mplayer's docs, the -wid not working in linuxfb environment. The qprocess started the mplayer who writes the framebuffer directly, it's working.

hey , sorry for not being clear but what i meant by hosted was like node app is not hosted anywhere . So i added node code to my qt project and in main.cpp i create a Qprocess of node and then just provide localhost url to webengineview.

this solves my purpose.

So in short what i did was :

copied node app code to my qt project. created a process of node running the node app via Qprocess. provided localhost url:port to webengineview and it shows the app.

Hi
Just as note.
You should do it in same shell
(start x server)
export DISPLAY=:0.0; /path/app

try to create a qmldir file, but it did not work

look for the error but I found nothing that serves me. I do not know if it has to do with the fact that I'm not using a qrc file.

in the ".pro" file, add a line to copy and paste the "qml" folder into the compiled directory. that's because I want the code jv and qml can be edited with any editor in the final version

#Copia la carpeta "qml" dentro de la carpeta build copydata.commands = $(COPY_DIR) $$PWD/qml $$OUT_PWD first.depends = $(first) copydata export(first.depends) export(copydata.commands) QMAKE_EXTRA_TARGETS += first copydata

Hi,

You should first check with the folks from Raspbian to see whether they apply patches to Qt.

Here is a small introduction about using the patch and diff commands.

@KroMignon said in Qt Android project and CVS like Git, Perforce, etc.:

Does it make sense to update it to a newer version (eg 3.5.1)?

Uh, no idae, to be honest. I've never installed Gradle myself. I think it comes bundled with Android SDK nowadays.

Hi @Tegan,

Not sure what the best approach is, but I'd:

check the installer's md5sum against https://download.qt.io/archive/qt/5.6/5.6.3/md5sums.txt compare the output of ldd qt-opensource-linux-x64-5.6.3.run on both hosts, then run the installer with gdb

Cheers.

@SGaist
Platform - Linux x86_64
Qt Version - 5.9.3

@JNBarchan
fontHeight produced a integer value +/- 56
iconHeight produced an integer value ( < fontHeight)

@VRonin
The Role's where not the problem. Please see my updated delegate below (kudos for calling it, the delegate being the problem)

Well this is embarrasing. I did not fully realize what I was coding until I had battled with the delegate all night.

I understood that I was coding a template, and assumed that on each item which was added, the origin remained at [0,0]. This was not the case as there was an offset added of value specified in the sizeHint (in my case, 56). Thus all my QListView's QStandardItem's were in fact there, but drawn over each other.

After changing values and experimenting over a long period (a number of hours), I finally came to the desired result, shown below.

Also, I need to thank scopchanov for his hint into this offset problem

StackoverFlow question as a reference

Updated ServerDelegate.cpp

#include "serverdelegate.h" ServerDelegate::ServerDelegate(QStyledItemDelegate *parent) : QStyledItemDelegate(parent) { fontCountry = QApplication::font(); fontCountry.setBold(true); fontCountry.setPointSize(QApplication::font().pointSize() + 3); fontCity = QApplication::font(); fontCity.setItalic(true); fontCity.setPointSize(QApplication::font().pointSize() - 1); } ServerDelegate::~ServerDelegate(){ } QSize ServerDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const{ Q_UNUSED(index) QSize totalCountrySize = Global::getCountryFlagFromCache(index.data(DataRole::CountryText).toString()).size(); QSize totalSideIcon = QPixmap(":/res/images/premium", "PNG").size(); QFontMetrics fmCountry(fontCountry); QFontMetrics fmCity(fontCity); int fontHeight = (2 * AppGlobal::Style_List_Seperator_Width) + (2 * AppGlobal::Style_List_Text_Item_Margin) + fmCountry.height() + fmCity.height(); int iconHeight = (2 * AppGlobal::Style_List_Seperator_Width) + (totalCountrySize.height() > totalSideIcon.height() ? totalCountrySize.height() : totalSideIcon.height()); int height = (fontHeight > iconHeight) ? fontHeight : iconHeight; int width = option.rect.width(); QSize size = QSize(width, height); return size; } void ServerDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const{ QStyledItemDelegate::paint(painter, option, index); QFontMetrics fmCountry(fontCountry); QFontMetrics fmCity(fontCity); QRect rec = option.rect; painter->save(); painter->setClipRect(rec); QString countryText = index.data(DataRole::CountryText).toString(); QString cityText = index.data(DataRole::CityText).toString(); QPixmap countryFlag = QPixmap(qvariant_cast<QPixmap>(index.data(DataRole::CountryFlag))); QPixmap sideIcon = qvariant_cast<QPixmap>(index.data(DataRole::SideIconFlag)); // Get a rectangle by size x, y. // With cooridinates [0,0]; [x,0]; [x,y]; [0,y] QRect topLine = option.rect, bottomLine = option.rect; // create top 'seperator' of X px's width, green in color; topLine.setTop(rec.top()); topLine.setLeft(rec.left()); topLine.setRight(rec.right()); topLine.setBottom(rec.top() + AppGlobal::Style_List_Seperator_Width); // 1px down painter->setPen(AppGlobal::Style_List_Seperator_Color); painter->fillRect(topLine, AppGlobal::Style_List_Seperator_Color); painter->drawRect(topLine); // create bottom 'seperator' of X px's width, green in color; bottomLine.setTop(rec.bottom() - AppGlobal::Style_List_Seperator_Width); bottomLine.setLeft(rec.left()); bottomLine.setRight(rec.right()); bottomLine.setBottom(rec.bottom()); // 1px down painter->setPen(AppGlobal::Style_List_Seperator_Color); painter->fillRect(bottomLine, AppGlobal::Style_List_Seperator_Color); painter->drawRect(bottomLine); // create background rectangle QRect content(rec.left(), topLine.bottom(), (rec.right() - rec.left()), (bottomLine.top() - topLine.bottom())); painter->setPen(AppGlobal::Style_List_Background_Color); painter->fillRect(content, ((option.state & QStyle::State_MouseOver) ? AppGlobal::Style_List_Hover_Color : AppGlobal::Style_List_Background_Color )); painter->drawRect(content); // create content rectangles from content container. QRect rectCountryFlag = content, rectSideIcon = content; // create country icon rectangle QSize countryFlagSize = countryFlag.size(); int cFPos = ((rectCountryFlag.bottom() - rectCountryFlag.top()) / 2) - (countryFlagSize.height() / 2) - 8; rectCountryFlag.setTop(rectCountryFlag.top() + cFPos); rectCountryFlag.setBottom(content.bottom() - cFPos); rectCountryFlag.setLeft(AppGlobal::Style_List_Left_Item_Margin - 8); rectCountryFlag.setRight(AppGlobal::Style_List_Left_Item_Margin + 16 + countryFlagSize.width()); painter->drawPixmap(rectCountryFlag, countryFlag); // create side icon rectangle QSize sideIconSize = sideIcon.size(); int siPos = ((rectSideIcon.bottom() - rectSideIcon.top()) / 2) - (sideIconSize.height() / 2) - 4; rectSideIcon.setTop(rectSideIcon.top() + siPos); rectSideIcon.setBottom(content.bottom() - siPos); rectSideIcon.setLeft(rec.width() - (AppGlobal::Style_List_Right_Item_Margin + 8 + sideIconSize.width())); rectSideIcon.setRight(rec.width() - AppGlobal::Style_List_Right_Item_Margin); painter->drawPixmap(rectSideIcon, sideIcon); int textContentLeft = rectCountryFlag.right() + AppGlobal::Style_List_Text_Item_Margin + AppGlobal::Style_List_Left_Item_Margin, textContentTop = content.top() + AppGlobal::Style_List_Text_Item_Margin; const QRect textContent( textContentLeft , textContentTop, (rectSideIcon.left() - AppGlobal::Style_List_Text_Item_Margin) - textContentLeft, (content.bottom() - AppGlobal::Style_List_Text_Item_Margin) - textContentTop); // create country text rectangle QRect rectCountryText = content, rectCityText = content; rectCountryText.setLeft(textContent.left()); rectCountryText.setTop(textContent.top()); rectCountryText.setRight(textContent.right()); rectCountryText.setBottom(textContent.top() + fmCountry.height()); painter->setPen(AppGlobal::Style_Heading_Color); painter->setFont(fontCountry); painter->drawText(rectCountryText, countryText); // create city text rectangle rectCityText.setLeft(textContent.left() + ( 2 * AppGlobal::Style_List_Text_Item_Margin)); rectCityText.setTop(rectCountryText.bottom()); rectCityText.setRight(textContent.right()); rectCityText.setBottom(textContent.bottom() + fmCity.height()); painter->setPen(AppGlobal::Style_SubText_Color); painter->setFont(fontCity); painter->drawText(rectCityText, cityText); // restore painter painter->restore(); }

Actually, since the base class already has a virtual destructor you can just remove the destructor of your derived altogether

@SGaist said in Infinite update data over modbus protocol:

I haven't used that module yet but are you sure you are not spamming your devices or triggering network congestion ?

Hi, I'm thinking that I do...

@RyuShai As I said on in your sysroot which you use to build for your target device. It doesn't help to install it on your host machine as you're building for another machine with different architecture (ARM). Your host machine is x86_64, right? If you install libs there they are for x86_64 as well - you cannot use them on ARM. Usually if you cross compile for other architectures you have a sysroot which contains all needed header files and libraries.

Hi
Also for my first attempt i used
http://doc.qt.io/qt-5/qtwidgets-tools-echoplugin-example.html

which is pretty small and easy to understand.

Hi,

If you want to use remote database systems like PostgreSQL or MySQL, you'll have to do some work first because neither of these provide native Android build of their package.

For PostgreSQL, there's a wiki article here.
For MySQL, there's a wiki article here.

As @jsulm already noted, it's usually a bad idea to design an application which access a database directly through an open network so take care to secure the connections appropriately using encryption.

Thanks @raven-worx and @Chris-Kawa for the quick answers.

@raven-worx said in Qt5 & invokeMethod:

the 2 methods behave the same.

I know that they seem to behave in the same way.
But creating an timer object, running & processing the timer/timeout and deleteing the object afterwards, feels like it should be more work than queing a function call via Q_Object-Macro-Magic. However the compiler may break it down to the same thing, after all.

@raven-worx said in Qt5 & invokeMethod:

You can check the return value of invokeMethod() and add an assertion.

That is actually a good idea, that way one would always get an immediate notification when the call becomes invalid due to changes made.
Still inconvenient, but much less so.

@Chris-Kawa said in Qt5 & invokeMethod:

In Qt 5.10 (currently in alpha) there's gonna be an overload taking pointer to function, so you'll be able to do:

YES, thanks for the info, I was not aware of that change.

Now I'm hyped for Qt 5.10 more so than previously!

With that said, I would consider my question answered.
Thanks everyone.

@CN_Simo

您是在MainWindow的close事件中，发射信号进行清理关闭工作的。

Qt signal and slot确实很方便。 可是有时候也会造成一些不必要的麻烦。很多时候，也可以传递对象的指针，直接在对应的地方调用对象的函数即可。

Found the error myself.
In the include dir there still was the file vtkGUISupportQtModule.h from the vtk-build included which defines

VTKGUISUPPORTQT_EXPORT __declspec(dllexport)

now its working

you can try this :

https://github.com/sunnyfulin/TankWar.git

a little game, almost the same with yours. not finished yet.

use keys: w , s , a , d to move the tank and mouse to control the turrent direction, and mouse's left button click to fire a bullet.
mouse's right button pressed for locking the turrent direction.

@jsulm
thanks for you reply! it is work! thanks again!

@danielheise said in Qt5.0 Graphics acceleration improvement:

Generally speaking what visual performance improves might be gained by moving to Qt5.0+? I understand this is quite the loaded question on several fronts.

I assume that you have widgets-based kiosk application where almost everything is done by Q(Graphics)WebView. In this case, moving to Qt 5.x may be very important for you because it allows you to use newer WebKit.

If your application allows browsing untrusted content, e.g. arbitrary web sites, using older WebKit may be dangerous because of unfixed security vulnerabilities In addition to security matters, QtWebKit 5.212 is much more compatible with moder Web content than older versions Even if you have control over the content that you disaply in your "browser", using newer WebKit allows you to use modern Web technologies like ES6, new HTML and CSS features etc.

Now about "hardware graphics acceleration". It's possible with both Qt 4 and Qt 5. In Qt 4, hardware accelerated graphics is possible with DirectFB or platform-specific QWS plugins. You also can use OpenGL, in this case you need to use QGraphicsWebView with QGLWidget viewport (in Qt 5 there is newer QOpenGLWidget).

I re-built the file system image, this time with Buildroot-2017.02 and Qt version 5.6.2.

I ran, on the target board, the audiooutput example that Qt provides and got a lots of pulseaudio warnings.

Remembering the above QT_DEBUG_PLUGINS hint, I took a look inside the /usr/lib/qt/plugins/audio directory on the target board and found two plugins: libqtmedia_pulse.so and libqtaudio_alsa.so .

Removing the libqtmedia_pulse.so plugin solved the race condition with libqtaudio_alsa.so and solved the problem.

In addition, make sure that alsa-lib builds before qt5multimedia (commit 8d7dd837e5e from mainline Buildroot: "qt5multimedia: conditionally add alsa-lib to dependencies").