transformed_value(transform::Function, widget::Any; [initial_value::Function])

Create a new widget that wraps around an existing one, with a value transformation.

This function creates a so-called high-level widget: it returns your existing widget, but with additional functionality. You can use it in your package

Example

A simple example to get the point accross:

function RepeatedTextSlider(text::String)
	transform = input -> repeat(text, input)
	new_widget = transformed_value(transform, PlutoUI.Slider(1:10))
	return new_widget
end

@bind greeting RepeatedTextSlider("hello")

# moving the slider to the right...

greeting == "hellohellohello"

This function is very useful in combination with PlutoUI.combine. Let's enhance our previous example by adding a text box where the repeated text can be entered. If you have not used PlutoUI.combine yet, you should read about that first.

function RepeatedTextSlider()
	# Note that the input to `transform` is now a Tuple!
	# (This is the output of `PlutoUI.combine`)
	transform = input -> repeat(input[1], input[2])

	old_widget = PlutoUI.combine() do Child
		md""" $(Child(PlutoUI.TextField())) $(Child(PlutoUI.Slider(1:10)))"""
	end
	new_widget = transformed_value(transform, old_widget)
	return new_widget
end