EXPORT_C TInt AknPhoneNumberTextUtils::CharsThatFitOnRight(
const TDesC& aText,
TInt aLineWidth,
const CFont& aFont )
{
// Current candidate text for fitting text
TPtrC currentText(aText);
// These two variables are converged by this algorithm until they differ by one
// Set max chars to be total length + 1, for the sake of the algorithm
TInt minCharsFromRightThatDoNotFit( aText.Length() + 1 );
TInt maxCharsFromRightThatFit(0); // must start at 0
// some incidentally used lengths
TInt currentLength(0); // arbitrary init value
TInt charsThatFitOnLeft(0); // arbitrary init value
TInt newLength(0); // arbitrary init value
while ( (minCharsFromRightThatDoNotFit - maxCharsFromRightThatFit) != 1 )
{
// At the top of the loop, all state is held by currentText itself, and the two
// maxCharsXXX variables.
currentLength = currentText.Length();
charsThatFitOnLeft = aFont.TextCount( currentText, aLineWidth);
if ( charsThatFitOnLeft == currentLength ) // Does this text fit ?
{
maxCharsFromRightThatFit = Max( maxCharsFromRightThatFit, charsThatFitOnLeft );
// If this text cannot be made any bigger, and still fit, then bail out
if ( (maxCharsFromRightThatFit + 1) >= minCharsFromRightThatDoNotFit )
{
// We can exit the loop now. Just fall out and the while test will handle it.
break;
}
else // if this string did fit, and it might have been too small, try making it bigger
{
// we know this is still be < minCharsFromRightThatDoNotFit
newLength = maxCharsFromRightThatFit + 1;
}
}
else // currentText does not fit. Repeat loop
{
// we know that this many characters did not fit on the line
minCharsFromRightThatDoNotFit = Min( minCharsFromRightThatDoNotFit, currentLength );
// Try using the number that fit on the left as the number we will fit on the right.
newLength = charsThatFitOnLeft;
}
currentText.Set(aText.Right(newLength));
}
return maxCharsFromRightThatFit;
}
EXPORT_C void TextUtils::ClipToFit(TDes& aBuffer,const CFont& aFont,TInt aMaxWidthInPixels,TChar aAlternativeEnd)
/** Clips text to fit into a maximum width.
If the text is too wide to fit in the width when displayed in aFont,
it is truncated and the specified character (by default,
a horizontal ellipsis) is appended to it.
@param aBuffer A buffer containing the text to clip.
@param aFont The font.
@param aMaxWidthInPixels The maximum width in pixels.
@param aAlternativeEnd The Unicode character to append to the buffer if truncated.
By default, this is the horizontal ellipsis. */
{
TInt textWidth=aFont.TextWidthInPixels(aBuffer);
if (textWidth<=aMaxWidthInPixels)
return;
TBuf<1> ellipse;
ellipse.Append(aAlternativeEnd);
TInt extraWidth=aFont.TextWidthInPixels(ellipse);
TInt cutOff=aFont.TextCount(aBuffer,aMaxWidthInPixels-extraWidth);
aBuffer.SetLength(cutOff);
aBuffer.Append(ellipse);
}
