Placeholder in WPF Kanban (SfKanban) control

31 May 20214 minutes to read

The placeholder is to denote a card’s new position in the KanbanColumn. It will appear while dragging a card over the column.

Placeholder style

PlaceholderStyle property is used to customize the placeholder. Following properties are used to customize its appearance.

  • Fill - This property is used to change the background color of the placeholder.
  • Stroke - This property is used to change the border color of the placeholder.
  • StrokeThickness - This property is used to change the border width of the placeholder.
  • StrokeDashArray - This property is used to change the dashes of the placeholder border.
  • FontSize - This is used to change the text size of the placeholder.
  • Foreground - This property is used to change the text color of the placeholder.
  • RadiusX - This property is used to change the x-radius of the placeholder.
  • RadiusY - This property is used to change the y-radius of the placeholder.
  • TextHorizontalAlignment - This property is used to change the horizontal alignment of the placeholder text.
  • TextVerticalAlignment - This property is used to change the vertical alignment of the placeholder text.

Following properties are used to customize the selected category when you have more than one category in a column.

  • SelectedBackground - This property is used to change the background color of the selected placeholder.
  • SelectedStroke - This property is used to change the border color of the selected placeholder.
  • SelectedStrokeThickness - This property is used to change the border width of the selected placeholder.
  • SelectedStrokeDashArray - This property is used to change the dashes of the selected placeholder.
  • SelectedFontSize - This is used to change the font size of the text in selected placeholder.
  • SelectedForeground - This property is used to change the color of the text in selected placeholder.
    The following code example describes the above behavior.
<kanban:PlaceholderStyle FontSize="20"

                         Foreground="DarkGreen"

                         Fill="Fuchsia"

                         Stroke="Blue"

                         StrokeThickness="2"

                         SelectedFontSize="20"

                         SelectedForeground="Maroon"

                         SelectedStroke="Yellow"

                         SelectedStrokeThickness="2"

                         SelectedBackground="LawnGreen">

</kanban:PlaceholderStyle>
PlaceholderStyle style = new PlaceholderStyle();

style.FontSize = 20;

style.Foreground = new SolidColorBrush(Colors.DarkGreen);

style.Fill = new SolidColorBrush(Colors.Fuchsia);

style.Stroke = new SolidColorBrush(Colors.Blue);

style.StrokeThickness = 2;

style.StrokeDashArray = new DoubleCollection() {1, 1};

style.SelectedFontSize = 20;

style.SelectedForeground = new SolidColorBrush(Colors.Maroon);

style.SelectedStroke = new SolidColorBrush(Colors.Yellow);

style.SelectedBackground = new SolidColorBrush(Colors.LawnGreen);

style.SelectedStrokeThickness = 2;

style.SelectedStrokeDashArray = new DoubleCollection() {2, 1};

sfKanban.PlaceholderStyle = style;

The following output demonstrates the above code example.

Placeholder support in WPF SfKanban

NOTE

The UI of the placeholder can be replaced entirely using PlaceholderTemplate property.