OgreTextAreaOverlayElement.h

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/*-------------------------------------------------------------------------
This source file is a part of OGRE
(Object-oriented Graphics Rendering Engine)

For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2012 Torus Knot Software Ltd
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE
-------------------------------------------------------------------------*/

#ifndef _TextAreaOverlayElement_H__
#define _TextAreaOverlayElement_H__

#include "OgreOverlayElement.h"
#include "OgreFont.h"

namespace Ogre
{
    class _OgreExport TextAreaOverlayElement : public OverlayElement
    {
    public:
        enum Alignment
        {
            Left,
            Right,
            Center
        };

    public:
        TextAreaOverlayElement(const String& name);
        virtual ~TextAreaOverlayElement();

        virtual void initialise(void);
        virtual void setCaption(const DisplayString& text);

        void setCharHeight( Real height );
        Real getCharHeight() const;

        void setSpaceWidth( Real width );
        Real getSpaceWidth() const;

        void setFontName( const String& font );
        const String& getFontName() const;

        virtual const String& getTypeName(void) const;
        const MaterialPtr& getMaterial(void) const;
        void getRenderOperation(RenderOperation& op);
        void setMaterialName(const String& matName);

        void setColour(const ColourValue& col);

        const ColourValue& getColour(void) const;
        void setColourBottom(const ColourValue& col);
        const ColourValue& getColourBottom(void) const;
        void setColourTop(const ColourValue& col);
        const ColourValue& getColourTop(void) const;

        inline void setAlignment( Alignment a )
        {
            mAlignment = a;
            mGeomPositionsOutOfDate = true;
        }
        inline Alignment getAlignment() const
        {
            return mAlignment;
        }

        void setMetricsMode(GuiMetricsMode gmm);

        void _update(void);

        //-----------------------------------------------------------------------------------------
        class _OgrePrivate CmdCaption : public ParamCommand
        {
        public:
            String doGet( const void* target ) const;
            void doSet( void* target, const String& val );
        };
        //-----------------------------------------------------------------------------------------
        class _OgrePrivate CmdCharHeight : public ParamCommand
        {
        public:
            String doGet( const void* target ) const;
            void doSet( void* target, const String& val );
        };
        //-----------------------------------------------------------------------------------------
        class _OgrePrivate CmdSpaceWidth : public ParamCommand
        {
        public:
            String doGet( const void* target ) const;
            void doSet( void* target, const String& val );
        };
        //-----------------------------------------------------------------------------------------
        class _OgrePrivate CmdFontName : public ParamCommand
        {
        public:
            String doGet( const void* target ) const;
            void doSet( void* target, const String& val );
        };
        //-----------------------------------------------------------------------------------------
        class _OgrePrivate CmdColourTop : public ParamCommand
        {
        public:
            String doGet( const void* target ) const;
            void doSet( void* target, const String& val );
        };
        //-----------------------------------------------------------------------------------------
        class _OgrePrivate CmdColourBottom : public ParamCommand
        {
        public:
            String doGet( const void* target ) const;
            void doSet( void* target, const String& val );
        };
        //-----------------------------------------------------------------------------------------
        class _OgrePrivate CmdColour : public ParamCommand
        {
        public:
            String doGet( const void* target ) const;
            void doSet( void* target, const String& val );
        };
        //-----------------------------------------------------------------------------------------
        class _OgrePrivate CmdAlignment : public ParamCommand
        {
        public:
            String doGet( const void* target ) const;
            void doSet( void* target, const String& val );
        };

    protected:
        Alignment mAlignment;

        bool mTransparent;

        RenderOperation mRenderOp;

        void addBaseParameters(void);

        static String msTypeName;

        // Command objects
        static CmdCharHeight msCmdCharHeight;
        static CmdSpaceWidth msCmdSpaceWidth;
        static CmdFontName msCmdFontName;
        static CmdColour msCmdColour;
        static CmdColourTop msCmdColourTop;
        static CmdColourBottom msCmdColourBottom;
        static CmdAlignment msCmdAlignment;


        FontPtr mFont;
        Real mCharHeight;
        ushort mPixelCharHeight;
        Real mSpaceWidth;
        ushort mPixelSpaceWidth;
        size_t mAllocSize;
        Real mViewportAspectCoef;

        ColourValue mColourBottom;
        ColourValue mColourTop;
        bool mColoursChanged;


        void checkMemoryAllocation( size_t numChars );
        virtual void updatePositionGeometry();
        virtual void updateTextureGeometry();
        virtual void updateColours(void);
    };
}

#endif