private void OnFontFamilyTextBoxTextChanged(object sender, TextChangedEventArgs eventArgs)
{
// Only handle if changed was caused by user.
if (_isInternalUpdate)
{
return;
}
// Find matching entry in the list.
var items = (IEnumerable <FontFamilyDescription>)_fontFamilyListBox.ItemsSource;
var matchingItem = items.FirstOrDefault(item => string.Compare(item.DisplayName, _fontFamilyTextBox.Text, true, CultureInfo.CurrentCulture) == 0);
if (matchingItem != null)
{
SelectedFontFamily = matchingItem.FontFamily;
return;
}
// No exact match found. See if the text is a matching prefix.
matchingItem = items.FirstOrDefault(item => item.DisplayName.StartsWith(_fontFamilyTextBox.Text, true, null));
if (matchingItem != null)
{
SelectedFontFamily = matchingItem.FontFamily;
return;
}
// No prefix match found. Make fuzzy search.
float bestMatchValue = -1;
FontFamilyDescription bestMatchItem = null;
foreach (var item in _fontFamilyListBox.Items.OfType <FontFamilyDescription>())
{
float match = StringHelper.ComputeMatch(_fontFamilyTextBox.Text, item.DisplayName);
if (match > bestMatchValue)
{
bestMatchValue = match;
bestMatchItem = item;
}
}
if (bestMatchItem != null)
{
SelectedFontFamily = bestMatchItem.FontFamily;
}
}
private void CreateFontFamilyDescriptions(object sender, DoWorkEventArgs eventArgs)
{
var fontFamilies = (ICollection <FontFamily>)eventArgs.Argument;
double i = 0;
int numberOfFontFamilies = fontFamilies.Count;
var items = new List <FontFamilyDescription>(numberOfFontFamilies);
foreach (var fontFamily in fontFamilies)
{
// Check whether user has canceled the loading process.
if (_backgroundWorker.CancellationPending)
{
eventArgs.Result = items;
return;
}
// Load font family.
var description = new FontFamilyDescription
{
DisplayName = FontHelper.GetDisplayName(fontFamily.FamilyNames),
FontFamily = fontFamily,
IsSymbolFont = FontHelper.IsSymbolFont(fontFamily),
};
items.Add(description);
// Report progress
i++;
int progress = (int)(i / numberOfFontFamilies * 100);
_backgroundWorker.ReportProgress(progress);
}
// Sort items by display name.
items.Sort((a, b) => string.Compare(a.DisplayName, b.DisplayName, StringComparison.CurrentCulture));
eventArgs.Result = items;
}