Talk:DragSlider

Alternate Version

Below is an edited version of the script that uses coroutines rather than the Update method.

<csharp>// MoveSlider.cs by spaniard 2006-07-19

using UnityEngine; using System.Collections;

public class MoveSlider : MonoBehaviour {

  // This script requires that the sliderBar and sliderWidget have the same transform
  // Positioning is done using pixelOffsets
  public GUITexture sliderBar = null;
  public GUITexture sliderWidget = null;
  public float minValue = 0;
  public float maxValue = 100;
  public float currentValue = 0;
  
  private bool connectedToMouse = false;
  private float originalX = 0;
  private float originalMouseX = 0;
  private float currentX = 0;
  private float halfWidgetWidth = 0;      // used to centre the widget at either end
  
  void Start () {
     halfWidgetWidth = (sliderWidget.pixelInset.xMax - sliderWidget.pixelInset.xMin) / 2;
     currentX = sliderWidget.pixelInset.xMin + halfWidgetWidth;
  }

  void OnMouseDown () {
     connectedToMouse = true;
     originalMouseX = Input.mousePosition.x;
     originalX = sliderWidget.pixelInset.xMin + halfWidgetWidth;
     startCoroutine("UpdatePosition");
  }
  
  void OnMouseUp () {
     connectedToMouse = false;
  }
  
  void UpdatePosition () {
     while (connectedToMouse) {
        // calculate currentX based on mouse position
        currentX = originalX - (originalMouseX - Input.mousePosition.x);
        // translate from the pixel values to the value
        currentValue = (((currentX - sliderBar.pixelInset.xMin) / (sliderBar.pixelInset.xMax - sliderBar.pixelInset.xMin)) * (maxValue - minValue)) + minValue;
        
        // make sure the value isn't out of bounds
        if (currentValue < minValue) {
           currentValue = minValue;
        } else if (currentValue > maxValue) {
           currentValue = maxValue;
        }
        // update where the sliderWidget is drawn from currentValue (in case the value is changed externally)
        currentX = (((currentValue - minValue) / (maxValue - minValue)) * (sliderBar.pixelInset.xMax - sliderBar.pixelInset.xMin)) + sliderBar.pixelInset.xMin;
        sliderWidget.pixelInset = new Rect ((currentX - halfWidgetWidth), sliderWidget.pixelInset.yMin, (currentX + halfWidgetWidth) - (currentX - halfWidgetWidth), sliderWidget.pixelInset.yMax - sliderWidget.pixelInset.yMin);
     
        // no do something with that new value!
        AudioListener.volume = currentValue;
     }
  }

}</csharp>