private static void HandleIsEnabledChanged(
DependencyObject source,
DependencyPropertyChangedEventArgs e)
{
if (!(source is TextBlock textBlock))
{
return;
}
if ((bool)e.OldValue)
{
FadeTrimming.Fader fader = FadeTrimming.GetFader((DependencyObject)textBlock);
if (fader != null)
{
fader.Detach();
FadeTrimming.SetFader((DependencyObject)textBlock, (FadeTrimming.Fader)null);
}
textBlock.Loaded -= new RoutedEventHandler(FadeTrimming.HandleTextBlockLoaded);
textBlock.Unloaded -= new RoutedEventHandler(FadeTrimming.HandleTextBlockUnloaded);
}
if (!(bool)e.NewValue)
{
return;
}
textBlock.Loaded += new RoutedEventHandler(FadeTrimming.HandleTextBlockLoaded);
textBlock.Unloaded += new RoutedEventHandler(FadeTrimming.HandleTextBlockUnloaded);
FadeTrimming.Fader fader1 = new FadeTrimming.Fader(textBlock);
FadeTrimming.SetFader((DependencyObject)textBlock, fader1);
fader1.Attach();
}
private static void HandleTextBlockLoaded(object sender, RoutedEventArgs e)
{
if (!(sender is DependencyObject dependencyObject))
{
return;
}
FadeTrimming.GetFader(dependencyObject)?.Attach();
}
private static void HandleVerticalFadingEnabled(
DependencyObject source,
DependencyPropertyChangedEventArgs e)
{
if (!(source is TextBlock textBlock))
{
return;
}
FadeTrimming.GetFader((DependencyObject)textBlock)?.ToggleVerticalFading((bool)e.NewValue);
}
private void UpdateForegroundBrush(object sender, EventArgs e)
{
Geometry layoutClip = LayoutInformation.GetLayoutClip((FrameworkElement)this._textBlock);
Rect bounds;
int num;
if (layoutClip != null)
{
if (this._textBlock.TextWrapping == TextWrapping.NoWrap)
{
bounds = layoutClip.Bounds;
if (bounds.Width > 0.0)
{
bounds = layoutClip.Bounds;
if (bounds.Width < this._textBlock.ActualWidth)
{
num = 1;
goto label_10;
}
}
}
if (this._verticalFadingEnabled && this._textBlock.TextWrapping == TextWrapping.Wrap)
{
bounds = layoutClip.Bounds;
if (bounds.Height > 0.0)
{
bounds = layoutClip.Bounds;
num = bounds.Height < this._textBlock.ActualHeight ? 1 : 0;
goto label_10;
}
}
num = 0;
}
else
{
num = 0;
}
label_10:
bool flag1 = num != 0;
if (this._isClipped && !flag1)
{
this._textBlock.OpacityMask = this._opacityMask;
this._brush = (LinearGradientBrush)null;
this._isClipped = false;
}
if (!flag1)
{
return;
}
bounds = layoutClip.Bounds;
double width = bounds.Width;
bounds = layoutClip.Bounds;
double height = bounds.Height;
bool flag2 = this._textBlock.TextWrapping == TextWrapping.Wrap;
if (this._brush == null)
{
this._brush = flag2 ? this.GetVerticalClipBrush(height) : this.GetHorizontalClipBrush(width);
this._textBlock.OpacityMask = (Brush)this._brush;
}
else if (flag2 && FadeTrimming.VerticalBrushNeedsUpdating(this._brush, height))
{
this._brush.EndPoint = new Point(0.0, height);
this._brush.GradientStops[1].Offset = (height - 20.0) / height;
}
else if (!flag2 && FadeTrimming.HorizontalBrushNeedsUpdating(this._brush, width))
{
this._brush.EndPoint = new Point(width, 0.0);
this._brush.GradientStops[1].Offset = (width - 10.0) / width;
}
this._isClipped = true;
}