public TextParentItem(PathFollowingContentDisplayer parent, TextBlock source)
{
m_renderTarget = source;
m_parent = parent;
m_dataSource = source.Text;
m_watcher = new DPWatcher(source);
TrackAndGetValue(source, TextBlock.FontFamilyProperty, TextElement.FontFamilyProperty, out FontFamily fontFamily);
TrackAndGetValue(source, TextBlock.FontStretchProperty, TextElement.FontStretchProperty, out FontStretch fontStretch);
TrackAndGetValue(source, TextBlock.FontStyleProperty, TextElement.FontStyleProperty, out FontStyle fontStyle);
TrackAndGetValue(source, TextBlock.FontWeightProperty, TextElement.FontWeightProperty, out FontWeight fontWeight);
TrackAndGetValue(source, TextBlock.FontSizeProperty, TextElement.FontSizeProperty, out m_foundFontSize);
m_watcher.Watch(TextBlock.TextProperty);
m_foundTypeface = new Typeface(fontFamily, fontStyle, fontWeight, fontStretch);
m_watcher.WatchedValueChanged += _DoNeedsRender;
void _DoNeedsRender(object _sender, EventArgs <object> _e)
{
// The text itself updated
if (_e.Value is string text)
{
m_dataSource = text;
this.ResetChildren();
}
this.TriggerNeedsRender();
}
}
private void TrackAndGetValue <T> (FrameworkElement source, DependencyProperty localProp, DependencyProperty textElementAttachedProp, out T foundValue)
{
if (source.ReadLocalValue(localProp) != DependencyProperty.UnsetValue)
{
foundValue = (T)source.GetValue(localProp);
}
else if (source.ReadLocalValue(textElementAttachedProp) != DependencyProperty.UnsetValue)
{
foundValue = (T)source.GetValue(textElementAttachedProp);
}
else
{
foundValue = (T)source.GetValue(localProp);
}
m_watcher.Watch(localProp);
m_watcher.Watch(textElementAttachedProp);
}