Create custom programmatic skins for Feathers UI components

ProgrammaticSkin may be used as a base class for drawing custom graphics to use as a skin for a Feathers UI component. While the framework provides a number of built-in skins with common shapes, like rectangles, circles, and ellipses, sometimes a design needs a more customize appearance with multiple borders, transparent overlays, or even animations.

The code below is based on the custom-programmatic-skin sample project. Full source code for this sample is available on Github.

To create a custom programmatic skin, subclass ProgrammaticSkin and override its update() method.

class CustomSkin extends ProgrammaticSkin {
    public function new() {

    override private function update():Void {
        // draw your skin here

Inside the update() method, draw vector graphics or add/update children to achieve the requirements of the design.

override private function update():Void {
    graphics.lineStyle(10.0, 0xff6666);
    graphics.moveTo(20.0, 5.0);
    graphics.lineTo(actualWidth - 20.0, 5.0);
    graphics.curveTo(actualWidth - 20.0, 20.0, actualWidth - 5.0, 20.0);
    graphics.lineTo(actualWidth - 5.0, actualHeight - 20.0);
    graphics.curveTo(actualWidth - 20.0, actualHeight - 20.0, actualWidth - 20.0, actualHeight - 5.0);
    graphics.lineTo(20.0, actualHeight - 5.0);
    graphics.curveTo(20.0, actualHeight - 20.0, 5.0, actualHeight - 20.0);
    graphics.lineTo(5.0, 20.0);
    graphics.curveTo(20.0, 20.0, 20.0, 5.0);

Whether you've set the dimensions explicitly, or they've been calculated dynamically, the actualWidth and actualHeight properties will contain the correct values for drawing your graphics or applying a layout.

Sample projects

Several sample projects demonstrate how to create different types of custom programmatic skins for Feathers UI components.