if (getParent())            {                getParent()->moveToTop(this);            }        }        else        {            throw GCN_EXCEPTION("Only a ScrollArea's content may be moved to top.");        }    }    void ScrollArea::moveToBottom(Widget* widget)    {        if (widget == mContent)        {            if (getParent())            {                getParent()->moveToBottom(this);            }        }        else        {            throw GCN_EXCEPTION("Only a ScrollArea's content may be moved to bottom.");        }    }    void ScrollArea::_announceDeath(Widget *widget)    {        if (widget == mContent)        {            mContent = NULL;            checkPolicies();        }        else        {            throw GCN_EXCEPTION("Called by not-child.");        }    }    void ScrollArea::getDrawSize(int& width, int& height, Widget* widget)    {        if (mContent == widget)        {            width = getContentDimension().width;            height = getContentDimension().height;        }        else        {            throw GCN_EXCEPTION("Widget not in scrollarea.");        }        }      void ScrollArea::drawContent(Graphics* graphics)    {        if (mContent)        {            mContent->draw(graphics);        }    }      void ScrollArea::checkPolicies()    {        int w = getWidth();        int h = getHeight();            mHBarVisible = false;        mVBarVisible = false;                if (!mContent)        {            mHBarVisible = (mHPolicy == SHOW_ALWAYS);            mVBarVisible = (mVPolicy == SHOW_ALWAYS);            return;        }            if (mHPolicy == SHOW_AUTO &&            mVPolicy == SHOW_AUTO)        {            if (mContent->getWidth() <= w                && mContent->getHeight() <= h)            {                mHBarVisible = false;                mVBarVisible = false;            }            if (mContent->getWidth() > w)            {                mHBarVisible = true;            }            if ((mContent->getHeight() > h)                || (mHBarVisible && mContent->getHeight() > h - mScrollbarWidth))            {                mVBarVisible = true;            }            if (mVBarVisible && mContent->getWidth() > w - mScrollbarWidth)            {                mHBarVisible = true;            }                  return;        }            switch (mHPolicy)        {          case SHOW_NEVER:              mHBarVisible = false;              break;          case SHOW_ALWAYS:              mHBarVisible = true;              break;          case SHOW_AUTO:              if (mVPolicy == SHOW_NEVER)              {                  mHBarVisible = mContent->getWidth() > w;              }              else // (mVPolicy == SHOW_ALWAYS)              {                  mHBarVisible = mContent->getWidth() > w - mScrollbarWidth;              }              break;          default:              throw GCN_EXCEPTION("Horizontal scroll policy invalid.");        }        switch (mVPolicy)        {          case SHOW_NEVER:              mVBarVisible = false;              break;          case SHOW_ALWAYS:              mVBarVisible = true;              break;          case SHOW_AUTO:              if (mHPolicy == SHOW_NEVER)              {                  mVBarVisible = mContent->getHeight() > h;              }              else // (mHPolicy == SHOW_ALWAYS)              {                  mVBarVisible = mContent->getHeight() > h - mScrollbarWidth;              }              break;          default:              throw GCN_EXCEPTION("Vertical scroll policy invalid.");        }    }    Rectangle ScrollArea::getUpButtonDimension()    {        if (!mVBarVisible)        {            return Rectangle(0, 0, 0, 0);        }            return Rectangle(getWidth() - mScrollbarWidth,                         0,                         mScrollbarWidth,                         mScrollbarWidth);    }    Rectangle ScrollArea::getDownButtonDimension()    {        if (!mVBarVisible)        {            return Rectangle(0, 0, 0, 0);        }        if (mVBarVisible && mHBarVisible)        {            return Rectangle(getWidth() - mScrollbarWidth,                             getHeight() - mScrollbarWidth*2,                             mScrollbarWidth,                             mScrollbarWidth);        }            return Rectangle(getWidth() - mScrollbarWidth,                         getHeight() - mScrollbarWidth,                         mScrollbarWidth,                         mScrollbarWidth);              }    Rectangle ScrollArea::getLeftButtonDimension()    {        if (!mHBarVisible)        {            return Rectangle(0, 0, 0, 0);        }            return Rectangle(0,                         getHeight() - mScrollbarWidth,                         mScrollbarWidth,                         mScrollbarWidth);        }    Rectangle ScrollArea::getRightButtonDimension()    {        if (!mHBarVisible)        {            return Rectangle(0, 0, 0, 0);        }        if (mVBarVisible && mHBarVisible)        {            return Rectangle(getWidth() - mScrollbarWidth*2,                             getHeight() - mScrollbarWidth,                             mScrollbarWidth,                             mScrollbarWidth);        }        return Rectangle(getWidth() - mScrollbarWidth,                         getHeight() - mScrollbarWidth,                         mScrollbarWidth,                         mScrollbarWidth);              }    Rectangle ScrollArea::getContentDimension()    {        if (mVBarVisible && mHBarVisible)        {            return Rectangle(0, 0, getWidth() - mScrollbarWidth,                              getHeight() - mScrollbarWidth);        }        if (mVBarVisible)        {            return Rectangle(0, 0, getWidth() - mScrollbarWidth, getHeight());        }        if (mHBarVisible)        {            return Rectangle(0, 0, getWidth(), getHeight() - mScrollbarWidth);        }            return Rectangle(0, 0, getWidth(), getHeight());    }    Rectangle ScrollArea::getVerticalBarDimension()    {        if (!mVBarVisible)        {            return Rectangle(0, 0, 0, 0);        }        if (mHBarVisible)        {            return Rectangle(getWidth() - mScrollbarWidth,                             getUpButtonDimension().height,                             mScrollbarWidth,                             getHeight()                              - getUpButtonDimension().height                             - getDownButtonDimension().height                             - mScrollbarWidth);        }            return Rectangle(getWidth() - mScrollbarWidth,                         getUpButtonDimension().height,                         mScrollbarWidth,                         getHeight()                          - getUpButtonDimension().height                         - getDownButtonDimension().height);    }     Rectangle ScrollArea::getHorizontalBarDimension()    {        if (!mHBarVisible)        {            return Rectangle(0, 0, 0, 0);        }        if (mVBarVisible)        {            return Rectangle(getLeftButtonDimension().width,                             getHeight() - mScrollbarWidth,                             getWidth()                              - getLeftButtonDimension().width                             - getRightButtonDimension().width                             - mScrollbarWidth,                              mScrollbarWidth);        }        return Rectangle(getLeftButtonDimension().width,                         getHeight() - mScrollbarWidth,                         getWidth()                          - getLeftButtonDimension().width                         - getRightButtonDimension().width,                         mScrollbarWidth);    }    Rectangle ScrollArea::getVerticalMarkerDimension()    {        if (!mVBarVisible)        {            return Rectangle(0, 0, 0, 0);        }        int length, pos;        Rectangle barDim = getVerticalBarDimension();        if (mContent && mContent->getHeight() != 0)        {                  length = (barDim.height * getContentDimension().height)                 / mContent->getHeight();        }        else        {            length = barDim.height;        }        if (length < mScrollbarWidth)        {            length = mScrollbarWidth;        }        if (length > barDim.height)        {            length = barDim.height;        }        if (getVerticalMaxScroll() != 0)        {            pos = ((barDim.height - length) * getVerticalScrollAmount())                / getVerticalMaxScroll();        }        else        {            pos = 0;        }            return Rectangle(barDim.x, barDim.y + pos, mScrollbarWidth, length);    }    Rectangle ScrollArea::getHorizontalMarkerDimension()    {        if (!mHBarVisible)        {            return Rectangle(0, 0, 0, 0);        }        int length, pos;        Rectangle barDim = getHorizontalBarDimension();        if (mContent && mContent->getWidth() != 0)        {                  length = (barDim.width * getContentDimension().width)                 / mContent->getWidth();        }        else        {            length = barDim.width;        }        if (length < mScrollbarWidth)        {            length = mScrollbarWidth;        }        if (length > barDim.width)        {            length = barDim.width;        }            if (getHorizontalMaxScroll() != 0)        {            pos = ((barDim.width - length) * getHorizontalScrollAmount())                / getHorizontalMaxScroll();        }        else        {            pos = 0;        }        return Rectangle(barDim.x + pos, barDim.y, length, mScrollbarWidth);    }    void ScrollArea::scrollToRectangle(const Rectangle& rectangle)    {        Rectangle contentDim = getContentDimension();            if (rectangle.x + rectangle.width            > getHorizontalScrollAmount() + contentDim.width)        {            setHorizontalScrollAmount(rectangle.x + rectangle.width - contentDim.width);        }            if (rectangle.y + rectangle.height            > getVerticalScrollAmount() + contentDim.height)        {            setVerticalScrollAmount(rectangle.y + rectangle.height - contentDim.height);        }        if (rectangle.x < getHorizontalScrollAmount())        {            setHorizontalScrollAmount(rectangle.x);        }            if (rectangle.y < getVerticalScrollAmount())        {            setVerticalScrollAmount(rectangle.y);        }    }    void ScrollArea::mouseWheelUp(int x, int y)    {            if (hasMouse())        {            setVerticalScrollAmount(getVerticalScrollAmount() - getContentDimension().height / 8);        }        }    void ScrollArea::mouseWheelDown(int x, int y)    {            if (hasMouse())        {            setVerticalScrollAmount(getVerticalScrollAmount() + getContentDimension().height / 8);        }        }}/* * Wow! This is a looooong source file. 1291 lines! */