Hi, so being a newbie at Qt (and a bit with C++) I've launched into this crazy DirectX project in Visual Studio using Qt. I don't like using the designer so I deleted my .UI file and ended up getting more control over my UI.h file. So now in my project I got 3 files:


  1. studio.cpp
  2. studio.h
  3. EditorUI.h


(I combined my main.cpp into studio.cpp to make things simpler)

In my studio.cpp I have to create a custom DirectX widget but it has to be created AFTER the window has been loaded and created. So I added it to my entry point, like so:

Qt Code: 
  1. //Show the main window
  2. Studio MainWindow;
  3. MainWindow.show();
  4.  
  5.  
  6. //Create our DirectX widget
  7. MainWindow.CreateViewport();
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Right before the entry point I declare CreateViewport();

Qt Code: 
  1. void Studio::CreateViewport()
  2. {
  3. 	//Instead of creating the DirectX widget, let's see if we can create a simple button on runtime
  4. 	BtnInitDevice = new QPushButton(this);
  5. 	BtnInitDevice->setObjectName(QString::fromUtf8("BtnInitDevice"));
  6. 	BtnInitDevice->setGeometry(QRect(20, 545, 200, 23));
  7. 	BtnInitDevice->winId();
  8. 	BtnInitDevice->setText(QApplication::translate("StudioClass", "Initialize DirectX11 Device", 0, QApplication::UnicodeUTF8));
  9.  
  10. 	/* DirectX widget
  11. 	//Aristos Portal
  12. 	MainViewport = new AristosPortal(this);
  13. 	MainViewport->PortalHandle = MainViewport->winId();
  14.  
  15. 	MainViewport->setObjectName(QString::fromUtf8("MainViewport"));
  16. 	MainViewport->setGeometry(QRect(20, 60, 640, 480));
  17. 	MainViewport->setAutoFillBackground(false);
  18. 	MainViewport->setStyleSheet(QString::fromUtf8("background-color:red;"));
  19.  
  20. 	//Must be after the window has been created!!!
  21. 	MainViewport->startAristos();
  22. 	*/
  23. }
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As you can see in the code above, I didn't try to create the custom DirectX widget, instead I try to do a button.

This function gets executed right after MainWindow.show(); but it does not create the button! I also tried creating a QWidget window but it flashes and appears only for a split second, it then vanishes!

So my question is whether or not am I using the correct procedure to create a widget after the window has been created?

Many thanks,

PS: Here is my full code

studio.cpp
Qt Code: 
  1. #include "studio.h"
  2. #include <QtGui>
  3. #include <QtGui/QApplication>
  4. #include <QtGui/QWidget>
  5. #include "AristosPortal.h"
  6.  
  7. //Some Declarations
  8. QPushButton *BtnInitDevice;
  9. AristosPortal *MainViewport;
  10.  
  11.  
  12. Studio::Studio(QWidget *parent, Qt::WFlags flags)
  13. 	: QMainWindow(parent, flags)
  14. {
  15. 	//Create the UI
  16. 	ui.setupUi(this);
  17.  
  18. }
  19.  
  20.  
  21. //Tries to only create a button
  22. void Studio::CreateViewport()
  23. {
  24.  
  25. 	BtnInitDevice = new QPushButton(this);
  26. 	BtnInitDevice->setObjectName(QString::fromUtf8("BtnInitDevice"));
  27. 	BtnInitDevice->setGeometry(QRect(20, 545, 200, 23));
  28. 	BtnInitDevice->winId();
  29. 	BtnInitDevice->setText(QApplication::translate("StudioClass", "Initialize DirectX11 Device", 0, QApplication::UnicodeUTF8));
  30.  
  31. 	/*
  32. 	//Aristos Portal
  33. 	MainViewport = new AristosPortal(this);
  34. 	MainViewport->PortalHandle = MainViewport->winId();
  35.  
  36. 	MainViewport->setObjectName(QString::fromUtf8("MainViewport"));
  37. 	MainViewport->setGeometry(QRect(20, 60, 640, 480));
  38. 	MainViewport->setAutoFillBackground(false);
  39. 	MainViewport->setStyleSheet(QString::fromUtf8("background-color:red;"));
  40.  
  41. 	//Must be after the window has been created!!!
  42. 	MainViewport->startAristos();
  43. 	*/
  44. }
  45.  
  46. Studio::~Studio()
  47. {
  48. //Fires when the app closes?
  49. }
  50.  
  51.  
  52.  
  53. //Entry point to the applicaton
  54.  
  55. int main(int argc, char *argv[])	
  56. {
  57. 	QApplication::setStyle(new QPlastiqueStyle);
  58. 	QApplication a(argc, argv);
  59.  
  60.  
  61. 	Studio MainWindow;
  62. 	MainWindow.show();
  63.  
  64.  
  65. 	//Create our viewport (or button, whatever)
  66. 	MainWindow.CreateViewport();
  67.  
  68. 	// This creates a window that flashes. Why? Why!?
  69. 	//QWidget MyWidget;
  70. 	//MyWidget.show();
  71.  
  72.  
  73. 	return a.exec();
  74. }
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studio.h
Qt Code: 
  1. #ifndef STUDIO_H
  2. #define STUDIO_H
  3.  
  4. #include <QtGui/QMainWindow>
  5.  
  6.  
  7. #include "EditorUI.h"
  8.  
  9.  
  10. class Studio : public QMainWindow
  11. {
  12. 	Q_OBJECT
  13.  
  14. public:
  15. 	Studio(QWidget *parent = 0, Qt::WFlags flags = 0);
  16. 	~Studio();
  17. 	void CreateViewport();
  18.  
  19.  
  20.  
  21.  
  22. private:
  23. 	Ui::StudioClass ui;
  24.  
  25. };
  26.  
  27. #endif // STUDIO_H
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