I'm somewhat new to both QT and Windows development in general (I develop on Linux at work and rarely do GUI programming). Anyway, I downloaded ACE and built it with Visual Studio Express 2008 and have been able to use it in VS programs but I'm having trouble making it play nicely with QTCreator. My .pro file in QTCreator includes thes...
I have a Qt app which embeds a Flash Player ActiveX control. I put a button over the flashplayer and I need to set some parts of it transparent. Since the AX control is not part of the Qt rendering pipe, it's needed to fake the transparency. For this purpose I grab the contents of the AX control from under the button, and use it when ren...
With the beginning of widespread HTML5 support and Canvas support, it seems that someone could create a desktop-esque windowing system library for RIAs. Something similar to Qt or WxWidgets. All the required parts seem to be there (runtime language: javascript, pixel drawing: canvas, even vector drawing with SVGs). This seems to me an...
How can one hide the scrollbars in a QScrollArea? Currently I use the hide() method on the scrollbars returned by QScrollArea::horizontalScrollBar() and QScrollArea::verticalScrollBar() but the space reserved for scrollbars still remains. Obviously this looks very ugly and is not space efficient. If I remove the scrollbars altogether I c...
Considering QGLWidget (or OpenGL in general), what can be the easiest solution to draw pixels in the inverse color of the screen / frame buffer? In Win32 / MFC environment, I used to use the SetROP2(R2_NOT) with zero pain. ...
I have a neat Model based off QAbstractItemModel. This has a simple hierarchical tree structure which works perfectly for QTreeView. However, I want the QTableView/QListView to access and display only the leaf nodes( ALL leaf nodes ). What is the best way to do this? I don't want to rebuild the model( because it will be expensive ) and I...
What is the recommended method of copying one QImage into another at a particular position in Qt4? QImage::bitblt was removed in Qt4. Does the QImage now need to be converted to a PixMap and back? ...
Hi, I understand how to add a scrollArea to a particular widget. However in my case Qwidget has multiple child widgets and these are all set using QVBoxLayout. Now how can I add a scroll bar in this case. Here QWidget is not center widget, its one of the pages of the TabWidget. My code look like: QTabWIdget *center = new QTabWidget; se...
I am working on an image processing application. I have to display an image sequence. I would like to avoid any extra overhead for {internal} format conversions. I believe RGB should be the optimal format for display. But SDL accepts various YUV formats and there is no native{to SDL} support for RGB. Whereas Qt does not accept YUV form...
I'm looking for a way to specialize a widget at runtime. I have a form created with Qt Designer. In this form there is a widget that displays user data, like name, age and so on. Then the user chooses a file and according to the type the widget shall display additional information (like to OO example person -> student, teacher). I tried...
Hello. If i create a table using Qt and SQLite that has a nullable columns (columns without "NOT NULL") and add a null value into it (using NULL QVariant) retrieving such value back will return not and NULL QVariant, but QVariant of type String and value "". Am i doing something wrong or Qt with SQLite can't distinguish between NULL val...
I have installed MySQL 5.1.49 and the binary QT 4.6.2 for Visual Studio 2008. I configured Qt as follow: C:\Qt>configure -static -no-webkit -plugin-sql-sqlite -plugin-sql-mysql -I C:\mysql\include -L C:\mysql\lib\optC:\Qt\src\plugins\sqldriver Everything went fine, no errors. When I run nmake on my application everything runs fine, no...
#include <iostream> using namespace std; int main () { cout << "Hello World!"; return 0; } This code works, but it run then close windows immediately. Need a fix :) ...
How to see Qt Source code while coding by Qt Creator ? when I Debug my program and hit a break point, and when I press F11 over a Qt function , Debugger steps into source code of that function, it is very interesting stuff :D now, I will see the source code of Qt functions in Qt creator while coding , not at Debug time :D ...
This is already fairly concise, but it would be awesome if I could map the list a la Ruby. Say I have a QStringList, myStringList, which contains things like "12.3", "-213.0", "9.24". I want to simply map the whole thing using toDouble without having to iterate. Does QT have a method for this? // i.e. I would love a one-liner for the fo...
I am coding a c++ project with Qt Creator. Everything is working fine (debug, release), but when I run the compiled .exe directly (go to exe file and run it) it says mingwm10.dll is missing. What can I do about this problem? ...
On Mac and Gnome, native applications use an application preferences dialog that immediately applies the chosen settings as they are selected. On Windows and (I think) KDE, preferences are applied only when an "Apply" or "OK" button is pressed. Are there any built-in Qt goodies to do this for you, or do you have to include several #ifde...
Recently tried the plugin example of Qt. It didn't work at all and I was confused as to the reason. Then found the solution on one of the forums. Qt, Application and plugin all three have to be built with the same configuration (Release/Debug) This works for me as I can build all three in Debug/Release mode. But if I want users to ex...
Hello, I want to make program that encrypts (later decrypts) user inputted string. Here is beginning for encryption: QString getData = ui->text->toPlainText(); //Data to process std::string output; //Result will be Base32 encoded string, so std::string is fine. Now, I have to convert QString to char* or std::string so it can be accept...
i got a godgiven list of xyz (the code says int, just an example) glued into a QList (to big to move anywhere). How can I create a Model View for that? I allready read the Qt doc which tells me, I have to reimplement data, index, parent, rowCount, columnCount functions. But the preprocessor/compiler cries for more reimplemented functions...