void UpdateTextState()
{
if ((m_textContainer == null) || (m_textBlock == null))
{
return;
}
var containerSize = m_textContainer.ActualWidth;
string oldText = m_textBlock.Text;
string newText = Utils.LRO + DisplayValue + Utils.PDF;
// Initiate the scaling operation
// UpdateLayout will keep calling us until we make it through the below 2 if-statements
if (!m_isScalingText || oldText != newText)
{
m_textBlock.Text = newText;
m_isScalingText = true;
m_haveCalculatedMax = false;
m_textBlock.InvalidateArrange();
return;
}
if (containerSize > 0)
{
double widthDiff = Math.Abs(m_textBlock.ActualWidth - containerSize);
double fontSizeChange = INCREMENTOFFSET;
if (widthDiff > WIDTHCUTOFF)
{
fontSizeChange = Math.Min(Math.Max(Math.Floor(WIDTHTOFONTSCALAR * widthDiff) - WIDTHTOFONTOFFSET, INCREMENTOFFSET), MAXFONTINCREMENT);
}
if (m_textBlock.ActualWidth < containerSize && Math.Abs(m_textBlock.FontSize - MaxFontSize) > FONTTOLERANCE && !m_haveCalculatedMax)
{
ModifyFontAndMargin(m_textBlock, fontSizeChange);
m_textBlock.InvalidateArrange();
return;
}
if (fontSizeChange < 5)
{
m_haveCalculatedMax = true;
}
if (m_textBlock.ActualWidth >= containerSize && Math.Abs(m_textBlock.FontSize - MinFontSize) > FONTTOLERANCE)
{
ModifyFontAndMargin(m_textBlock, -1 * fontSizeChange);
m_textBlock.InvalidateArrange();
return;
}
Debug.Assert(m_textBlock.FontSize >= MinFontSize && m_textBlock.FontSize <= MaxFontSize);
m_isScalingText = false;
if (IsOperatorCommand)
{
m_textContainer.ChangeView(0.0, null, null);
}
else
{
m_textContainer.ChangeView(m_textContainer.ExtentWidth - m_textContainer.ViewportWidth, null, null);
}
if (m_scrollLeft != null && m_scrollRight != null)
{
if (m_textBlock.ActualWidth < containerSize)
{
ShowHideScrollButtons(Visibility.Collapsed, Visibility.Collapsed);
}
else
{
if (IsOperatorCommand)
{
ShowHideScrollButtons(Visibility.Collapsed, Visibility.Visible);
}
else
{
ShowHideScrollButtons(Visibility.Visible, Visibility.Collapsed);
}
}
}
m_textBlock.InvalidateArrange();
}
}
