This is a Qt-specific question. It's convenient to be able to add new data to a table by typing content into a blank row at the bottom of a table. When the data is committed, a new blank row is added to the table. Has anyone found a way of implementing this in a generic way, that fits into Qt's model-view programming architecture? My c...
Hi, i want to build a pointer to a Qt Slot: union { void (*set_slot)(unsigned long value); void (*refresh_slot)(void); } the_slot; The slot definition is: void set_pwm(unsigned long new_pwm); I try to do something like this: the_slot.set_slot = set_pwm; But the compiler says that the signature does not match: error:...
If you have a QImage wrapped inside a QLabel, is it possible to scale it up or down when you resize the window and maintain the aspect ratio (so the image doesn't become distorted)? I figured out that it can scale using setScaledContents(), and you can set a minimum and maximum size, but the image still loses its aspect. It would be gr...
Hello! I have a project to create a program, which prevents the user from escaping a GUI program. The program is designed for students to take exams in. The program contains a web browser page. I have looked around and asked in different places how I should do this, and I have been recommended Qt. I am now having second thoughts about ...
I'm developing a multi-player game and I know nothing about how to connect from one client to another via a server. Where do I start? Are there any whizzy open source projects which provide the communication framework into which I can drop my message data or do I have to write a load of complicated multi-threaded sockety code? Does th...
So the question is how to set a value of textEdit from another form? P.S. Sorry for my English. ...
I'm building a an application using Qt on the Symbian/S60 platform and I was wondering if there was a standard notification window that I could use to pass messages to users. Using other platforms as examples, I'm looking for something equivalent to Javascript's alert() method or Cocoa's NSRunAlert* methods. If there is not a native Sy...
I'm working on an NMDC client (p2p, DC++ and friends) with Qt. The protocol itself is pretty straightforward: $command parameters| Except for compression: "ZPipe works by sending a command $ZOn| to the client. After $ZOn a ZLib compressed stream containing commands will follow. This stream will end with an EOF that ZLib defines. ...
I am trying to build a package from source and ./configure tells me I am missing package QtCore. Been googling & trying apt-get without success. Help please. ...
I have a QT application that requires the MySql driver. I have both a .pro file to compile the app with QtCreator and a .vcproj for Visual C++ 2008 Express. The code is identical and it compiles without a hitch, but the executable created by Visual C++ Express gives me the following output and refuses to load any driver/plugin: QSqlData...
Hi. I want to use Cairo graphics library whith Qt, but I can't find any documenattion. I just want to make the GUI whith Qt and use Cairo for drawing graphics in a Qt window. Thanks. ...
I'm having a problem with a QPlainTextEdit. I want the "contents have been modified" asterisk to appear in the title bar whenever the contents have been modified. In the example below, type a few letters. The asterisk appears as it should. Hit Ctrl+S, the asterisk disappears as it should. But then if you type a few more letters... w...
What exactly are my options? I have programs I need to write in OpenGL and DirectX, and I'd like to use Qt for OpenGL, and not have to re-implement half my program for the DirectX components of my task. I've looked on Google and I have found references to people complaining about Direct3D being a dependency of Qt, and people talking abo...
Hello, I'm new to Qt. I'd like a window to follow the mouse around the screen. (It's a useful aid to reading) The best I can come up with is a timer that uses QPoint QCursor::pos() to move the window every .1 seconds. Rather than spinning this timer constantly, is there an event system I can tap into? This would look smoother, and u...
The following code somehow fails to notice any files with non-ASCII characters in their names (Cyrillic characters, specifically): for (int path = 1; path < argc; path++) { QFileInfo fi(argv[path]); if (fi.isDir()) { QDir dir(argv[path], "", QDir::LocaleAware, QDir::AllEntries); qDebug() << dir.entryList(); QDirIterator ...
I'm porting a UNIX application which uses the Qt framework (Qt, not QuickTime) to Mac/Cocoa. Life is good, generally. Qt has a Cocoa implementation, so with some Objective-C++, I've gotten lots of Mac-specific bits working. I can't get the main menu (i.e., the Application menu) to translate. It's set using: [NSApp setMainMenu:menu]...
I'm using a QPainter to get some graphics on a window. Unfortunately every time the .paintEvent is run, the whole window is cleared. How can I draw without clearing? I.e. how do I leave the stuff from previous paint event untouched? I'm using Qt4 ...
My Eclipse CDT has some problems with either resolving Qt headers or code completion. The example will explain everything. Usually the include would look like this: #include <QPushButton> But when I use code completion in Eclipse it replaces the include with following: #include <qpushbutton.h> Technically everything works and the p...
I'm having a QT/C++ problem with a simple QWidget program that draws an ellipse inside a child QWidget. The program is composed of: (1) A parent QWidget (2) A child QWidget (used as the drawing surface for an ellipse) (3) A draw QPushButton Here is part of the code (QPushButton Slot and Signal code omitted for simplicity) void Draw::...
My program's really consuming CPU time far more than I'd like (2 displays shoots it up to 80-90%). I'm using Qtimers, and some of them are as short as 2ms. At any given time, I can have 12+ timers going per display -- 2ms, 2ms, 2ms, 250ms, the rest ranging between 200ms and 500ms. Would it be better if I used threads for some or all of t...