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#pragma once
#include "irender.h"
namespace render
{
/**
* Text instance which can be attached to an ITextRenderer
* Automatially takes care of deregistering and registering
* on renderer change or destruction of this object.
*
* This is an incomplete implementation of IRenderableText,
* use the StaticRenderableText type for a simple working class.
*/
class RenderableTextBase :
public IRenderableText
{
private:
ITextRenderer::Ptr _renderer;
ITextRenderer::Slot _slot;
protected:
RenderableTextBase() :
_slot(ITextRenderer::InvalidSlot)
{}
// Noncopyable
RenderableTextBase(const RenderableTextBase& other) = delete;
RenderableTextBase& operator=(const RenderableTextBase& other) = delete;
public:
virtual ~RenderableTextBase()
{
clear();
}
void update(const ITextRenderer::Ptr& renderer)
{
bool rendererChanged = _renderer != renderer;
if (rendererChanged)
{
clear();
}
// Update our local reference
_renderer = renderer;
if (_renderer && _slot == ITextRenderer::InvalidSlot)
{
_slot = _renderer->addText(*this);
}
}
void clear()
{
removeTextFromRenderer();
_renderer.reset();
}
private:
// Removes the text from the attached renderer. Does nothing if no text has been added.
void removeTextFromRenderer()
{
if (_renderer && _slot != ITextRenderer::InvalidSlot)
{
_renderer->removeText(_slot);
}
_slot = ITextRenderer::InvalidSlot;
}
};
}
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