This post looked at creating a custom flex 4 component from scratch. The knob button defined there had a min/max-value for the range and the rotation. The user could adjust the value by pressing the knob and then dragging the mouse. Now, we would like to extend the control a bit by adding a text input-field where the value of the knob is reflected. Likewise a value can be entered into the textfield and the rotation of the knob would reflect this.

Instead of extending the knob I decided to create another control that is a composition (more…)

In this and this post I had a look at skinning components in Flex 4. Here I had a go at creating a simple custom component in Flex 4 (Gumbo) from scratch. The goal was to create a simple knob-button like those found on many softsynths.

The user clicks the button and drags the mouse to adjust the value. The advantage of a knob compared to a slider is that it needs much less screen estate and could be more intuitive in specific contexts to control a value.

click here to view the demo. Full source at the end of this post.

Creating a custom visual component in Flex 4 is similar to the procedure in Flex 3 but states and skins are handled differently (in a much better and cleaner way). Basically we need to (more…)