CEGUI 扩展自己控件 类型转换错误

[tan625747]

CEGUITestWindow.h文件

#pragma once
#include "CEGUIBase.h"
#include "CEGUIWindow.h"
#include "CEGUITestWindowProperties.h"


namespace CEGUI
{
        namespace TestWindowProperties
    {
        class SelectedTextColor: public CEGUI::Property
        {
        public:
            SelectedTextColor() : Property(
                "SelectedTextColor",
                "设置或者获取选择状态下的文字颜色",
                "FFFFFFFF")
            {}
            //设置和获取属性的函数
            String    get(const PropertyReceiver* receiver) const;
            void    set(PropertyReceiver* receiver, const String& value);
        };
    }

    class CEGUIEXPORT TestWindow:public Window
    {
    public:
        static const String EventNamespace;                //全局事件的事件空间
        static const String WidgetTypeName;              //窗口类厂的名称
        static const String EventLeftClicked;    

    public:
        TestWindow(const String& type, const String& name);
        ~TestWindow(void){};
        void  setSelectedTextColour(colour& c);
        colour getSelectTextColour();
        void addTestWindowProperties(void);

        virtual bool    testClassName_impl(const String& class_name) const
        {
            if (class_name=="Combobox")    return true;
            return Window::testClassName_impl(class_name);
        }

    private:
        colour d_selectTextColor;
        static TestWindowProperties::SelectedTextColor    d_selectedTextColourProperty;
    };

}

CEGUITestWindow.cpp文件

#include "elements/CEGUITestWindow.h"
#include "CEGUIPropertyHelper.h"
#include "CEGUIPropertyHelper.h"

namespace CEGUI
{
    const String TestWindow::EventNamespace("TestWindow");
    const String TestWindow::WidgetTypeName("CEGUI/TestWindow");
    const String TestWindow::EventLeftClicked( "LeftClicked" );

    TestWindow::TestWindow(const String& type, const String& name) :
    Window(type, name)
    {}

    void TestWindow::setSelectedTextColour(colour& c)
    {
        d_selectTextColor = c;
    }
    colour TestWindow::getSelectTextColour()
    {
        return d_selectTextColor;
    }

    void TestWindow::addTestWindowProperties(void)
    {
        addProperty(&d_selectedTextColourProperty);
    }


namespace TestWindowProperties
    {

        String SelectedTextColor::get (const PropertyReceiver* receiver) const
        {
            return static_cast<const TestWindow*>(receiver)->getSelectTextColour();//这里出错
        }
        void     SelectedTextColor::set(PropertyReceiver* receiver, const String& value)
        {
            static_cast<TestWindow*>(receiver)->setSelectedTextColour(PropertyHelper::stringToColour(value));//stringToColour(value));
        }
}

}

编译错误

error C2662: 'CEGUI::TestWindow::getSelectTextColour' : cannot convert 'this' pointer from 'const CEGUI::TestWindow' to 'CEGUI::TestWindow &'

CEGUI 库 仿官方CoboBox控件，这是CoboBox 控件其中的一个函数，它的没有问题，为什么我的出现问题呢？

String ValidationString::get(const PropertyReceiver* receiver) const
{
return static_cast<const Combobox*>(receiver)->getValidationString();
}

编写自己的控件，大家看出为什么出错了吗，怎么改呢。

[老邓]

把String SelectedTextColor::get (const PropertyReceiver* receiver) const
把红色的const去掉试试？