How to color the tasks with dependencies differently?

Sometimes you might want to color tasks with dependencies (either successor or predecessor) differently like this:

Custom colors for dependent lines

You can do so as follows:

Step 1: First listen to these events that cause some tasks to participate in dependencies:

void ganttControl_DependencyLineAdded(object sender, DependencyLineEventArgs e)

{

this.ResetTaskColors();

}

This event will fire when you draw the dependency line between tasks.

void ganttControl_DependencyLineRemoved(object sender, DependencyLineEventArgs e)

{

this.ResetTaskColors();

}

private void ResetTaskColors()

{

this.ganttControl.TaskColorsBinding = new Binding("DataSource")

{

Converter = new CustomTaskColorProvider() { DepCollections =

//Contains the gantt dependencylines

this.ganttControl.Model.Dependencies }

};

}

Step 2: Implement this converter used above that will render these tasks that participate in dependencies differently:

public class CustomTaskColorProvider : IValueConverter

{

public DependenciesCollection DepCollections{get;set;}

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

{

IActivity activity = parameter as IActivity;

// If this activity participates in dependency

if (this.IsTaskDepended(activity))

{

LinearGradientBrush barStrokeBrush = new LinearGradientBrush() { StartPoint = new Point(0, 0), EndPoint = new Point(0, 1) };

barStrokeBrush.GradientStops.Add(new GradientStop() { Color = Colors.Transparent, Offset = 0 });

barStrokeBrush.GradientStops.Add(new GradientStop() { Color = Color.FromArgb(255, 0xFF, 0xA0, 0x7A), Offset = 0.25 });

barStrokeBrush.GradientStops.Add(new GradientStop() { Color = Color.FromArgb(255, 0xFF, 0x63, 0x47), Offset = 1 });

return new TaskSpecificLook()

{

TaskItemBarFill = barStrokeBrush,

TaskItemBarStroke = new SolidColorBrush(Color.FromArgb(255, 0xFF, 0x63, 0x47)),

TaskItemProgressFill = new SolidColorBrush(Colors.Black),

SummaryItemBarStroke = new SolidColorBrush(Color.FromArgb(255, 0xFF, 0x63, 0x47)),

};

}

return null;

}

public bool IsTaskDepended(IActivity activity)

{

// returns true if this activity participates in dependency

return DepCollections[activity]!=null;

}

public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

{

throw new NotImplementedException();

}