device-run() issue when switching GUI

[thefuzion]

Hi,

I'm having troubles to write a clean and safe function that switches between two GUIs.
I precise that my program is NOT multithreaded. And I use only Irrlicht to handle inputs/GUI events.

I have something like that :

Code: Select all

// clear current GUI
device->clearSystemMessages();
device->setEventReceiver(NULL);
const core::list<IGUIElement*>& children = env->getRootGUIElement()->getChildren();
while (!children.empty())
	(*children.getLast())->remove();

// create new GUI
gui::IGUIContextMenu* menu = env->addMenu();
menu->addItem(L"File", -1, true, true);
...
add other GUI stuff
...
device->clearSystemMessages();
device->setEventReceiver(this->er);

I though it was quite clean but i'm getting an exception (sometimes only) when I switch GUIs. The exception is detected by the debugger on the line "while(device->run())". It seems that this is about events because the more I press keys or other inputs during the switch, the more I have chance to get the exception.

Also, sometimes it doesn't throw any exception but the new created GUI is built partially only... This is very weird.

Has anyone an idea about how to solve this problem ?

Thanks in advance!

[CuteAlien]

did you try just calling clear() for the gui-environment instead of manually removing the gui-elements? It does some more things - it also makes sure the hovered and the focused element get cleaned up.

If that still doesn't work, it would help to have a complete example to reproduce this bug.

[thefuzion]

Thanks for reply,

I tried env->clear() but it was even worse as it made it fail almost all the time (the exception occurred more often).

It seems I have just solved my problem by removing only what I strictly needed to remove. Thus, I am not removing anymore the Menu and the Toolbar them-self. I don't know why, but it seems that Irrlicht doesn't like when you remove a Menu and/or a Toolbar and then create a new one...
It's weird, but i'm quite sure this was the problem.

It would be long for me to do a little program which reproduces exactly the same bug, and I really don't have time currently. I'll try to make something later if you want.

[thefuzion]

No it wasn't that. I don't have the problem anymore but I remove the menu and the toolbar...