Button.cpp
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	#include <echo/GUI/Image.h>
	#include <echo/Graphics/Mesh.h>
	#include <echo/GUI/Button.h>

	namespace Echo
	{
	namespace GUI
	{
	Button::Button(shared_ptr<Material> idleMaterial) : Image(idleMaterial), mIdleMaterial(idleMaterial)
	{
	}

	Button::~Button()
	{

	}

	Scalar Button::GetNativeAspectRatio()
	{
	//We'll find a material to use based on the following order:
	// - idle
	// - hover
	// - pressed
	// - released

	shared_ptr<Material> material = mIdleMaterial;
	if(!material)
	{
	material = mHoverMaterial;
	}

	if(!material)
	{
	material = mPressedMaterial;
	}

	if(!material)
	{
	material = mReleasedMaterial;
	}

	if(material)
	{
	// We need to make a decision about which pass to use. The first seems
	// the most appropriate because in a GUI sense the first is likely to contain
	// a texture for the base size. Any additional passes are likely to be for
	// aesthetic purposes.
	RenderPass* pass = material->GetPass(0);
	if(pass)
	{
	// We need to make a decision about which texture unit to use. The first seems
	// the most appropriate because in a GUI sense the first is likely to be the
	// base size. Any additional units are likely to be for aesthetic purposes.
	TextureUnit* tu = pass->GetTextureUnit(0);
	if(tu)
	{
	//Getting close
	shared_ptr<Texture> texture = tu->GetTexture();
	if(texture)
	{
	Scalar width = static_cast<Scalar>(texture->GetWidth());
	Scalar height = static_cast<Scalar>(texture->GetHeight());
	return (width/height);
	}
	}
	}
	}
	return 1.f;
	}

	void Button::SetIdle(shared_ptr<Material> material)
	{
	mIdleMaterial = material;
	}

	void Button::SetPressed(shared_ptr<Material> material)
	{
	mPressedMaterial = material;
	}

	void Button::SetReleased(shared_ptr<Material> material)
	{
	mReleasedMaterial = material;
	}

	void Button::SetHover(shared_ptr<Material> material)
	{
	mHoverMaterial = material;
	}

	void Button::OnCursorEnter(Scalar absoluteX, Scalar absoluteY)
	{
	if(mHoverMaterial)
	{
	SetMaterial(mHoverMaterial);
	}else
	{
	SetMaterial(mIdleMaterial);
	}
	}

	void Button::OnCursorHover(Scalar absoluteX, Scalar absoluteY)
	{
	if(mHoverMaterial)
	{
	SetMaterial(mHoverMaterial);
	}else
	{
	SetMaterial(mIdleMaterial);
	}
	Element::OnCursorHover(absoluteX, absoluteY);
	}

	void Button::OnCursorLeave(Scalar absoluteX, Scalar absoluteY)
	{
	SetMaterial(mIdleMaterial);
	Element::OnCursorLeave(absoluteX, absoluteY);
	}

	void Button::OnCursorPress(Scalar absoluteX, Scalar absoluteY)
	{
	if(mPressedMaterial)
	{
	SetMaterial(mPressedMaterial);
	}else
	{
	SetMaterial(mIdleMaterial);
	}
	Element::OnCursorPress(absoluteX, absoluteY);
	}

	void Button::OnCursorHold(Scalar absoluteX, Scalar absoluteY)
	{
	if(mPressedMaterial)
	{
	SetMaterial(mPressedMaterial);
	}else
	{
	SetMaterial(mIdleMaterial);
	}
	Element::OnCursorHold(absoluteX, absoluteY);
	}

	void Button::OnCursorRelease(Scalar absoluteX, Scalar absoluteY)
	{
	if(mReleasedMaterial)
	{
	SetMaterial(mReleasedMaterial);
	}else
	{
	SetMaterial(mIdleMaterial);
	}
	Element::OnCursorRelease(absoluteX, absoluteY);
	}
	}
	}

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