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6 - Text Resizing
ResizeText() is the key to our new features. It creates our truncated text, based on the valid width (if positive), and the current font: void paLabel::ResizeText(void)
{
if ( NULL!=m_origText )
{
strcpy(m_dispText,m_origText);
if ( m_width>=0 ) // do we truncate?
{
unsigned int len=GUI_TruncateText(m_font,m_dispText,m_width,false);
if (len<strlen(m_dispText))
m_dispText[len]='\0';
}
CLabel::SetLabel(m_dispText); // resize/redisplay
}
}
Now we see why we don't set our label in
the constructor. Each time ResizeText() is
called, it checks if truncation is desired
(a positive width value), and creates a second
string copy which has its pointer passed
to CLabel. It is our parent CLabel class
that deals with drawing, but always with
the special truncated string of ours. So
with very little effort we have a size-limiting
text class that maintains our string for
us.The sample code for this column includes this class, and an example of both a CLabel and a paLabel in action. Drawn between two black shapes onscreen, the paLabel is clipped to avoid overwriting the right rectangle. On the other hand, the CLabel immediately overwrites when the button is pressed. For clipping occasions like this, a child override of CLabel can be very handy. While not perfect, this class can be a springboard to further modifications, such as allowing color, justification, and so forth.
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