Custom ProgressBarBrushConverter Not Filling In ProgressBar
- by Wonko the Sane
Hello All,
I am attempting to create a custom ProgressBarBrushConverter, based on information from here and here. However, when it runs, the progress is not being shown. If I use the code found in the links, it appears to work correctly.
Here is the converter in question:
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
ProgressBar progressBar = null;
foreach (object value in values)
{
if (value is ProgressBar)
{
progressBar = value as ProgressBar;
break;
}
}
if (progressBar == null)
return DependencyProperty.UnsetValue;
FrameworkElement indicator =
progressBar.Template.FindName("PART_Indicator", progressBar)
as FrameworkElement;
DrawingBrush drawingBrush = new DrawingBrush();
drawingBrush.Viewport = drawingBrush.Viewbox =
new Rect(0.0, 0.0, indicator.ActualWidth, indicator.ActualHeight);
drawingBrush.ViewportUnits = BrushMappingMode.Absolute;
drawingBrush.TileMode = TileMode.None;
drawingBrush.Stretch = Stretch.None;
DrawingGroup group = new DrawingGroup();
DrawingContext context = group.Open();
context.DrawRectangle(progressBar.Foreground, null,
new Rect(0.0, 0.0, indicator.ActualWidth, indicator.ActualHeight));
context.Close();
drawingBrush.Drawing = group;
return drawingBrush;
}
Here is the ControlTemplate (the MultiBinding is to make sure that the converter is called whenever the Value or IsIndeterminate properties are changed):
<ControlTemplate x:Key="customProgressBarTemplate"
TargetType="{x:Type ProgressBar}">
<Grid>
<Path x:Name="PART_Track"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Stretch="Fill"
StrokeLineJoin="Round"
Stroke="#DDCBCBCB"
StrokeThickness="4"
Data="M 20,100 L 80,10 C 100,120 160,140 190,180 S 160,220 130,180 T 120,150 20,100 Z ">
<Path.Fill>
<MultiBinding>
<MultiBinding.Converter>
<local:ProgressBarBrushConverter />
</MultiBinding.Converter>
<Binding RelativeSource="{RelativeSource FindAncestor,
AncestorType={x:Type ProgressBar}}" />
<Binding Path="IsIndeterminate"
RelativeSource="{RelativeSource TemplatedParent}"/>
<Binding Path="Value"
RelativeSource="{RelativeSource TemplatedParent}"/>
</MultiBinding>
</Path.Fill>
<!--<Path.LayoutTransform>
<RotateTransform Angle="180" CenterX="190" CenterY="110" />
</Path.LayoutTransform>-->
</Path>
<Rectangle x:Name="PART_Indicator"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Margin="1" />
</Grid>
</ControlTemplate>
Finally, the Window code (fairly straightforward - it just animates progress from 0 to 100 and back again):
<ProgressBar x:Name="progress"
Template="{StaticResource customProgressBarTemplate}"
Foreground="Red">
<ProgressBar.Triggers>
<EventTrigger RoutedEvent="ProgressBar.Loaded">
<BeginStoryboard x:Name="storyAnimate">
<Storyboard>
<DoubleAnimationUsingKeyFrames
Duration="0:0:12"
AutoReverse="True"
FillBehavior="Stop"
RepeatBehavior="Forever"
Storyboard.TargetName="progress"
Storyboard.TargetProperty="(ProgressBar.Value)">
<LinearDoubleKeyFrame Value="0" KeyTime="0:0:0" />
<LinearDoubleKeyFrame Value="100" KeyTime="0:0:5" />
<LinearDoubleKeyFrame Value="100" KeyTime="0:0:6" />
<LinearDoubleKeyFrame Value="0" KeyTime="0:0:11" />
<LinearDoubleKeyFrame Value="0" KeyTime="0:0:12" />
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</ProgressBar.Triggers>
</ProgressBar>
I am thinking that the problem is in the DrawRectangle call in the Convert method, but setting a TracePoint on it shows what appear to be valid values for the Rect.
What am I missing here?
Thanks,
wTs
