Simple Gui events

[trollger]

I am now trying to learn irrlicht inbuilt GUI system
and everything is going smooth except for setting up GUI events.

This is what I have so far (well part of it and it does work) but my problem is in the if statement I only see isPressed (). How would I extend this to isReleased () or isHover () ? I looked through the Api and I dont see anything simular to this if any one can help me or has some tips about the GUI sytem in genral please let me know


IGUIButton * MyButton = env->addButton(rect<s32>(10,240,110,240 + 32), 0);
MyButton->setText(L"button");

//this is in the game loop
if(MyButton->isPressed()) // would like a few alternative events
{
ISceneNode* Billboard = smgr->addBillboardSceneNode();
Billboard->setPosition(vector3df(0,0,45));
Billboard->setMaterialFlag(video::EMF_LIGHTING, false);
Billboard->setMaterialTexture(0, driver->getTexture("../../media/particle.bmp"));
}

[mager]

you could right a small function like this

Code: Select all

bool hasDown = false;

bool isReleased()
{
if(hasDown)
{
   if(MyButton.isPressed())
   {
       hasDown = true;
       return false;
   }
}
else
{
   if(!MyButton.isPressed() && hasDown)
   {
       hasDown = false;
       return true;
   }
}
       
}

Note - I did not check the API for functionality, i was just showing a way you could similate that functionality in the event that there wasn't one

[trollger]

hm.... I'll try it out,
thanks

[CuteAlien]

Do you want to catch the state (getting "pressed" each frame) or the event (only getting it once the button is pressed)?

If you only need the event and want to react on that, then you should use an eventreceiver. Check the examples - many of those use one.

[trollger]

I looked at the events receivers but didn't quite understand how they work I suppose I will have to take another look at it.

[Iyad]

All you have to do is a class that inherit of IEventReceiver that overload the OnEvent(const SEvent &event) method, then instanciate the receiver and from the device pointer, call setEventReceiver(YourReceiver).

Note : you OnEvent method should return always return false.