Scripting Reference
Handles.ScaleSlider

static function ScaleSlider (scale : float, position : Vector3, direction : Vector3, rotation : Quaternion, size : float, snap : float) : float

Parameters

NameDescription
scale The value the user can modify.
position The position of the handle.
direction The direction of the handle.
rotation The rotation of whole object.
size The size of the handle.
snap The new value after the user has modified it. Note: Use HandleUtility.GetHandleSize where you might want to have constant screen-sized handles.

Description

Make a directional scale slider


Scale slider handle in the Scene View. 

// Increase/decrease a value just by moving the Scale slider Handle


@CustomEditor (FreeScale)
class FreeScaleHandleJS extends Editor {
    function OnSceneGUI () {
        target.val = Handles.ScaleSlider(target.val, 
                        target.transform.position, 
                        Vector3.up, 
                        Quaternion.identity, 
                        5, 
                        HandleUtility.GetHandleSize(target.transform.position));
        if (GUI.changed)
            EditorUtility.SetDirty (target);
    }
}

And the script attached to this handle: 

// FreeScale.js
@script ExecuteInEditMode()

var val : float = 1;

function Update () {
    Debug.Log("Value tied to the slider: " + val);
}