TextBox.cpp
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	#include <echo/GUI/TextBox.h>
	#include <echo/Graphics/TextMesh.h>

	namespace Echo
	{
	namespace GUI
	{
	TextBox::TextBox(const UTF8String& content, shared_ptr<FontManager> fontManager) : mFontManager(fontManager)
	{
	Initialise();
	SetText(content);
	}

	TextBox::TextBox(shared_ptr<FontManager> fontManager) : mFontManager(fontManager)
	{
	Initialise();
	}

	TextBox::~TextBox()
	{

	}

	void TextBox::Initialise()
	{
	SetTargetable(true);

	mLineSize = 0.f; //Start with a zero size line size so when we initialise it to 1 it performs the change actions.
	mAspectRatio = 1.f;
	mOriginalHeight = 1.f;
	mUpdatingForTextAdjustment = false;;

	mText.reset(new Text(UTF8String(), mFontManager));
	//Align to the top left. We'll support other directions and alignments later.
	mText->SetHorizontalAlignment(Alignments::MINIMUM);
	mText->SetVerticalAlignment(Alignments::MAXIMUM);
	mText->SetRelativePosition(Vector3(0.,1.,0.));

	//Use the maximum width so the text will wrap.
	mText->SetUseMaxWidth(true);
	mText->SetMaxWidth(GetAspectRatio());

	//Enable mesh extent points so scaling is easier
	mText->SetAddMeshExtentVertices(true);

	// For horizontal text we'll know the width because it will be fixed, The height will depend on
	// the number of lines so we'll calculate it.
	mText->SetSizeMode(SizeModes::WIDTH_AND_CALCULATE_ASPECT_RATIO);

	// The TextBox is made targetable but the text itself isn't.
	mText->SetTargetable(false);

	//Set the line size to 1.
	SetLineSize(1.f);
	AddElement(mText);
	}

	void TextBox::SetFont(const std::string& fontName, Scalar pointSize)
	{
	mText->SetFont(fontName, pointSize);
	UpdateTextMesh();
	}

	void TextBox::SetFontSize(Scalar pointSize)
	{
	mText->SetFontSize(pointSize);
	}

	void TextBox::SetTextureFilterMethod(TextureUnit::TextureFilter filterMethod)
	{
	mText->SetTextureFilterMethod(filterMethod);
	}

	void TextBox::SetText(const UTF8String& text)
	{
	mText->SetText(text);
	UpdateTextMesh();
	}

	const UTF8String& TextBox::GetText() const
	{
	return mText->GetText();
	}

	void TextBox::SetLineSize(Scalar lineSize)
	{
	if(mLineSize!=lineSize)
	{
	mLineSize = lineSize;
	mCurrentLineSize = mLineSize;
	shared_ptr<Font> font=mText->GetFont();
	if(font)
	{
	Scalar heightScaledToOne = mLineSize/font->GetMaxHeight();
	mText->SetTextScale(heightScaledToOne);
	UpdateTextMesh();
	}
	}
	}

	void TextBox::UpdateTextMesh()
	{
	shared_ptr<Font> font=mText->GetFont();
	if(mUpdatingForTextAdjustment \|\| !font)
	{
	return;
	}

	mUpdatingForTextAdjustment = true;

	if(mText->GetUsePointSize())
	{
	//Build the text mesh using the specified line height.
	mCurrentLineSize = mLineSize;
	if(mText->GetWorldUnitsConverter())
	{
	// The maximum width is the absolute width of the text box converted to pixels since the units on
	// the mesh are pixels when Text is in point mode.
	mText->SetMaxWidth(GetAbsoluteWidth()/mText->GetWorldUnitsConverter()->GetUnitsPerPixelX());

	//New height of the TextBox is calculated as the relative size of the parent.
	if(GetParentElement())
	{
	Scalar parentHeightInPixels = (GetParentElement()->GetAbsoluteHeight()/mText->GetWorldUnitsConverter()->GetUnitsPerPixelY());
	if(parentHeightInPixels>0)
	{
	Scalar newHeight = mText->GetTextMeshSize().y / parentHeightInPixels;
	SetHeight(newHeight);
	}else
	{
	SetHeight(0);
	}
	}else
	{
	SetHeight(mText->GetTextMeshSize().y);
	}
	}
	}else
	{
	// Set the height of the textbox to the originally specified height as a starting
	// point if we don't do this then the box will never shrink.
	SetHeight(mOriginalHeight);

	//Build the text mesh using the specified line height.
	mCurrentLineSize = mLineSize;
	mText->SetTextScale( mCurrentLineSize/font->GetMaxHeight() );
	mText->SetMaxWidth(GetAspectRatio());

	//Check if the height exceeds the parent.
	Scalar currentHeight = mText->GetLineCount()*mCurrentLineSize;
	if(currentHeight > 1.f)
	{
	//Adjust the line size by the inverse of currentHeight (which will be a ratio)
	mCurrentLineSize /= currentHeight;

	mText->SetMaxWidth(GetAspectRatio());

	//Adjust the text box to fit the text
	SetHeight(mOriginalHeight * currentHeight);
	}
	}
	mUpdatingForTextAdjustment = false;
	}

	void TextBox::SetSize(Scalar width, Scalar height)
	{
	if(!mUpdatingForTextAdjustment)
	{
	mOriginalHeight = height;
	}
	Element::SetSize(width, height);
	}

	void TextBox::SetHeight(Scalar height)
	{
	if(!mUpdatingForTextAdjustment)
	{
	mOriginalHeight = height;
	}
	Element::SetHeight(height);
	}

	void TextBox::UpdateSize(Scalar newWidth, Scalar newHeight)
	{
	if(newHeight==0.f)
	{
	return;
	}
	Scalar newAspectRatio = newWidth/newHeight;
	if(mAspectRatio==newAspectRatio \|\| newAspectRatio==0.f)
	{
	return;

	}
	//Record the aspect ratio to avoid rebuilding if they are the same.
	mAspectRatio = newAspectRatio;
	UpdateTextMesh();
	Container::UpdateSize(newWidth,newHeight);
	}
	}
	}

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