IlvObjectLFHandler
Once a gadget has retrieved its look-and-feel handler, it must ask its specific object look-and-feel handler. This object look-and-feel handler is implemented by means of the
IlvObjectLFHandler class. Each component that needs to be look-and-feel dependant must create a subclass of the
IlvObjectLFHandler class.
Getting a Pointer to an IlvObjectLFHandler Object
The
IlvLookFeelHandler class handles a hash table of
IlvObjectLFHandler. Each instance of the
IlvObjectLFHandler class can be retrieved using its class information. For example, the following code retrieves the object look-and-feel handler of the
IlvButton class:
IlvLookFeelHandler lfh = display->getLookFeelHandler();
IlvButtonLFHandler* buttonLF = (IlvButtonLFHandler*)
lfh->getObjectLFHandler(IlvButton::ClassInfo());
Note: The value returned by getObjectLFHandler is cast into an IlvButtonLFHandler pointer, which is the base class for button object look-and-feel handlers. |
After retrieving a pointer to its specific object look-and-feel handler, the button can draw itself using the following code:
void
IlvButton::draw(IlvPort* dst,
const IlvTransformer* t,
const IlvRegion* clip) const
{
IlvButtonLFHandler* lfhandler = (IlvButtonLFHandler*)
getObjectLFHandler(IlvButton::ClassInfo());
lfhandler->draw(this, dst, t, clip);
}
Version 6.3
Copyright © 2018, Rogue Wave Software, Inc. All Rights Reserved.