Irrlicht Engine

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//create a slot window
CGUISlotWindow* window = new CGUISlotWindow(device, gui->getRootGUIElement(), -1, rect<s32>(25, 25, 300, 200));
window->drop();

//create a button to show/hide the window
IGUIButton* button = window->createBringUpButton(rect<s32>(10,210,110,242));
button->drop();

//load some very beautiful textures
ITexture* slotTex = driver->getTexture("slot.png");
ITexture* iconTex2 = driver->getTexture("icon.png");
ITexture* iconTex2 = driver->getTexture("icon2.png");

//create an array of slots in the window
core::array<IGUIElement*> slotArray = window->addSlotArray(core::rect<s32>(0,0,32,32), slotTex, 0, -1,
core::position2d<s32>(10,30),core::dimension2d<s32>(6,3),core::dimension2d<s32>(10,10));

//create an icon
CGUIIcon *icon = new CGUIIcon(gui, gui->getRootGUIElement(), -1, rect<s32>(0,0,32,32));
icon->drop();
icon->setImage(iconTex);

//create another icon
CGUIIcon *icon2 = new CGUIIcon(gui, gui->getRootGUIElement(), -1, rect<s32>(0,0,32,32));
icon2->drop();
icon2->setImage(iconTex2);

//let the icons know about the slots
icon->setUsableSlotArray(&slotArray);
icon2->setUsableSlotArray(&slotArray);

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//! called if an event happened.
		virtual bool OnEvent(const SEvent& event);

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1>CGUISlotWindow.cpp
1>c:\documents and settings\quockhanh\デスクトップ\cguiicon\cguislotwindow.cpp(233) : error C2259: 'irr::gui::CGUIBringUpSlotWindowButton' : cannot instantiate abstract class
1>        due to following members:
1>        'bool irr::gui::IGUIButton::isPressed(void) const' : is abstract
1>        d:\engine\irrlicht-1.4\include\iguibutton.h(113) : see declaration of 'irr::gui::IGUIButton::isPressed'
1>        'bool irr::gui::IGUIButton::isAlphaChannelUsed(void) const' : is abstract
1>        d:\engine\irrlicht-1.4\include\iguibutton.h(119) : see declaration of 'irr::gui::IGUIButton::isAlphaChannelUsed'
1>        'bool irr::gui::IGUIButton::isPushButton(void) const' : is abstract
1>        d:\engine\irrlicht-1.4\include\iguibutton.h(122) : see declaration of 'irr::gui::IGUIButton::isPushButton'
1>        'bool irr::gui::IGUIButton::isDrawingBorder(void) const' : is abstract
1>        d:\engine\irrlicht-1.4\include\iguibutton.h(128) : see declaration of 'irr::gui::IGUIButton::isDrawingBorder'

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//! Returns if the alpha channel should be used for drawing images on the button
		virtual bool isAlphaChannelUsed() const;

AND 

//! Returns if the alpha channel should be used for drawing images on the button
bool CGUIBringUpSlotWindowButton::isAlphaChannelUsed() const
{
	_IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
	return UseAlphaChannel;
}

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//! Returns if the alpha channel should be used for drawing images on the button
		virtual bool isAlphaChannelUsed();


//! Returns if the alpha channel should be used for drawing images on the button
bool CGUIBringUpSlotWindowButton::isAlphaChannelUsed() 
{
	_IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
	return UseAlphaChannel;
}