General and Desktop

Hi and welcome to devnet, Please share the content of that file.

@mzimmers said in I could use some guidelines on layouts: Well you can still change font type etc. byt yes, x,y is locked. I also notice that I'm unable to resize widgets in design mode when the widgets are in a layout. You set minimum size or max size to express such wishes. you can also set fixed size to not let it take more space. So you can change size but its other way than when not in layout.

@raven-worx Thank for the idea! I'll dig into it!

@Fuel QRegExp is the older version within Qt. It is better to start with QRegularExpression There is an example given which can help you also in testing different regular expression with some text.

@samdol I also tried the following approach. Manually adding '\0's between files. It seems it should work. but it moves a file to trach only when I delete one file. If I try to delete more than one file, it does not do anything. bool moveToTrash( QStringList filename_list ){ WCHAR* from= new WCHAR[ 999999 ]; int l=filename_list.at(0).toWCharArray( from ); from[l]='\0'; int i; for( i=1;i<filename_list.size();i++){ WCHAR* from_tmp = new WCHAR[ filename_list.at(i).size() ]; l += filename_list.at(i).toWCharArray( from_tmp ); wcscat (from, from_tmp); from[l+i]='\0'; } from[l+i+1]='\0'; SHFILEOPSTRUCT fileop; memset( &fileop, 0, sizeof( fileop ) ); fileop.wFunc = FO_DELETE; fileop.pFrom = from; fileop.fFlags = FOF_ALLOWUNDO | FOF_NOCONFIRMATION | FOF_NOERRORUI | FOF_SILENT; int rv = SHFileOperationW( &fileop ); //Takes 20 ~ 70 ms which is 90% of deleting process. 5 times slower than just deleting. return true; }

It's not that simple. If data is shared between threads, you have to synchronize them manually through a mutex or a semaphore. QSharedPointer as the name suggests, is a pointer that's being shared, not the object it points to.

@SGaist OK. Thanks got it

@tobiSF I wish, I haven't found one. I just use the docs from Qt.. There are a few good pages that show everything. I found that header view one in the docs as I mentioned.

Hi and welcome to devnet, Since your widgett is called PixmapView then in your CanvaTest class you can use ui->PixmapView ..

Or from the reply that is passed in the context of the lambda.

Hi When learning how the coordinates works i used this class CustomScene : public QGraphicsScene { protected: void mousePressEvent(QGraphicsSceneMouseEvent* event) { QGraphicsScene::mousePressEvent(event); qDebug() << event->scenePos(); } }; Not sure what you are looking for but this is minimal sample of getting clicks.

@bask185 No, I did not write anything about signals/slots. I mean a class which manages the log writing. There is no need to do it in main window. Just provide static methods: class Logger { public: static void log(const QString &text); private: static QFile logFile; }; ... Logger::log("Some text");

Hello, I got solved it. Signal selectionChanged is only fired after moving with the cursor keys to the table cell and pressing enter. But I don't want to have to press enter. The solution was derive my own TableView class from QTableView class GenericTableView : public QTableView { Q_OBJECT public: GenericTableView(QObject* parent = NULL); void currentChanged(const QModelIndex &current, const QModelIndex &previous); signals: void currentChangedSignal(QModelIndex, QModelIndex); }; and overwrite currentchanged and sending a self defined signal where I react on void GenericTableView::currentChanged(const QModelIndex &current, const QModelIndex &previous) { emit currentChangedSignal(current, previous); } Next problem was to use this derived class in the Qt From Designer. To solve it first you have to insert a normal QTableView and then do a right click on it and click "promote to" here you can specify that the element refers to yout own (in my case GenericTableView) TableView. And last but not least do another right right click and select "Change signals/slots" here you can add your self defined signal (in my case currentChangedSignal). Now you can connect the signal with a slot on the common way by right cklick and select "Goto slot". Thats it. Thanks everbody for your support.

@artwaw I found what was the problem. Qt saves the image pixels in BGR order so, to get the right values it would be necccesary to catch them this way: B = *auxInPtCol++; G = *auxInPtCol++; R = *auxInPtCol++;

It worked!Thx ~ I read the open() doc and it says: When reading, the end-of-line terminators are translated to '\n'. When writing, the end-of-line terminators are translated to the local encoding, for example '\r\n' for Win32. So it is due to the Qfile think 0x0D is '\r' when I falsely used it.

@BinuJanardhanan said in FomLay out and its size: Here widget in form layout occupied less space but too much free space is there. how can I avoid free space of right and bottom? widgetWithFormLayout->setSizePolicy( QSizePolicy::Fixed, QSizePolicy::Fixed );

@VRonin Thank you .Thank you very much.

@jsulm When the pop up Message Box shows "python has stopped working", I clicked "debug" rather than close, then visual studio was started, in visual studio, it shows Unhandled exception at 0x0000000059A17DF1 (QtGui4.dll) in python.exe: 0xC000041D: An unhandled exception was encountered during a user callback I was using pycharm to trace code step by step, however it nev, aer run to this issue by step by step since there are two many small steps/callback/signal/slot to go through, as long as I let it run without breakpoint, it will crash with segmentation fault.