// Copyright (C) 2002-2007 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#include "CGUICheckBox.h"
#include "IGUISkin.h"
#include "IGUIEnvironment.h"
#include "IVideoDriver.h"
#include "IGUIFont.h"
#include "os.h"

namespace irr
{
namespace gui
{

//! constructor
CGUICheckBox::CGUICheckBox(bool checked, IGUIEnvironment* environment, IGUIElement* parent, s32 id, core::rect<s32> rectangle)
: IGUICheckBox(environment, parent, id, rectangle), Pressed(false), Checked(checked), checkTime(0)
{
	#ifdef _DEBUG
	setDebugName("CGUICheckBox");
	#endif

	// this element can be tabbed into
	setTabStop(true);
	setTabOrder(-1);
}



//! destructor
CGUICheckBox::~CGUICheckBox()
{
}



//! called if an event happened.
bool CGUICheckBox::OnEvent(SEvent event)
{
	switch(event.EventType)
	{
	case EET_KEY_INPUT_EVENT:
		if (event.KeyInput.PressedDown &&
			(event.KeyInput.Key == KEY_RETURN || 
			 event.KeyInput.Key == KEY_SPACE))
		{
			Pressed = true;
			return true;
		}
		else
		if (Pressed && event.KeyInput.PressedDown && event.KeyInput.Key == KEY_ESCAPE)
		{
			Pressed = false;
			return true;
		}
		else
		if (!event.KeyInput.PressedDown && Pressed &&
			(event.KeyInput.Key == KEY_RETURN || 
			 event.KeyInput.Key == KEY_SPACE))
		{
			Pressed = false;
			if (Parent)
			{
				SEvent newEvent;
				newEvent.EventType = EET_GUI_EVENT;
				newEvent.GUIEvent.Caller = this;
				newEvent.GUIEvent.Element = 0;
				Checked = !Checked;
				newEvent.GUIEvent.EventType = EGET_CHECKBOX_CHANGED;
				Parent->OnEvent(newEvent);
			}
			return true;
		}
		break;
	case EET_GUI_EVENT:
		if (event.GUIEvent.EventType == EGET_ELEMENT_FOCUS_LOST)
		{
			if (event.GUIEvent.Caller == this)
				Pressed = false;
		}
		break;
	case EET_MOUSE_INPUT_EVENT:
		if (event.MouseInput.Event == EMIE_LMOUSE_PRESSED_DOWN)
		{
			Pressed = true;
			checkTime = os::Timer::getTime();
			Environment->setFocus(this);
			return true;
		}
		else
		if (event.MouseInput.Event == EMIE_LMOUSE_LEFT_UP)
		{
			bool wasPressed = Pressed;
			Environment->removeFocus(this);
			Pressed = false;

			if (wasPressed && Parent)
			{
				if ( !AbsoluteClippingRect.isPointInside( core::position2d<s32>(event.MouseInput.X, event.MouseInput.Y) ) )
				{
					Pressed = false;
					return true;
				}

				SEvent newEvent;
				newEvent.EventType = EET_GUI_EVENT;
				newEvent.GUIEvent.Caller = this;
				newEvent.GUIEvent.Element = 0;
				Checked = !Checked;
				newEvent.GUIEvent.EventType = EGET_CHECKBOX_CHANGED;
				Parent->OnEvent(newEvent);
			}

			return true;
		}
		break;
	}

	return Parent ? Parent->OnEvent(event) : false;
}



//! draws the element and its children
void CGUICheckBox::draw()
{
	if (!IsVisible)
		return;

	IGUISkin* skin = Environment->getSkin();

	core::rect<s32> rect = AbsoluteRect;

	s32 height = skin->getSize(EGDS_CHECK_BOX_WIDTH);

	core::rect<s32> checkRect(AbsoluteRect.UpperLeftCorner.X,
								((AbsoluteRect.getHeight() - height) / 2) + AbsoluteRect.UpperLeftCorner.Y,
								 0, 0);

	checkRect.LowerRightCorner.X = checkRect.UpperLeftCorner.X + height;
	checkRect.LowerRightCorner.Y = checkRect.UpperLeftCorner.Y + height;

	skin->draw3DSunkenPane(this, skin->getColor(Pressed ? EGDC_3D_FACE : EGDC_ACTIVE_CAPTION),
		false, true, checkRect, &AbsoluteClippingRect);

	if (Checked && Environment->getSkin())
		Environment->getSkin()->drawIcon(this, EGDI_CHECK_BOX_CHECKED, checkRect.getCenter(), 
			checkTime, os::Timer::getTime(), false, &AbsoluteClippingRect);

	if (Text.size())
	{
		checkRect = AbsoluteRect;
		checkRect.UpperLeftCorner.X += height + 5;

		IGUIFont* font = skin->getFont();
		if (font)
			font->draw(Text.c_str(), checkRect, 
			skin->getColor(EGDC_BUTTON_TEXT), false, true, &AbsoluteClippingRect);
	}

	IGUIElement::draw();
}


//! set if box is checked
void CGUICheckBox::setChecked(bool checked)
{
	Checked = checked;
}


//! returns if box is checked
bool CGUICheckBox::isChecked()
{
	_IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
	return Checked;
}

//! Writes attributes of the element.
void CGUICheckBox::serializeAttributes(io::IAttributes* out, io::SAttributeReadWriteOptions* options=0)
{
	IGUICheckBox::serializeAttributes(out,options);
	out->addBool	("Checked",			Checked );
}

//! Reads attributes of the element
void CGUICheckBox::deserializeAttributes(io::IAttributes* in, io::SAttributeReadWriteOptions* options=0)
{
	Checked = in->getAttributeAsBool ("Checked");

	IGUICheckBox::deserializeAttributes(in,options);
}


} // end namespace gui
} // end namespace irr