105 lines
3.2 KiB
C#
105 lines
3.2 KiB
C#
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/// Credit zero3growlithe
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/// sourced from: http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/page-2#post-2011648
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/*USAGE:
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Simply place the script on the ScrollRect that contains the selectable children we'll be scroling to
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and drag'n'drop the RectTransform of the options "container" that we'll be scrolling.*/
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using UnityEngine.EventSystems;
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namespace UnityEngine.UI.Extensions
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{
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[RequireComponent(typeof(ScrollRect))]
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[AddComponentMenu("UI/Extensions/UIScrollToSelection")]
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public class UIScrollToSelection : MonoBehaviour {
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//*** ATTRIBUTES ***//
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[Header("[ References ]")]
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[SerializeField]
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private RectTransform layoutListGroup;
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[Header("[ Settings ]")]
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[SerializeField]
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private float scrollSpeed = 10f;
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//*** PROPERTIES ***//
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// REFERENCES
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protected RectTransform LayoutListGroup {
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get {return layoutListGroup;}
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}
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// SETTINGS
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protected float ScrollSpeed {
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get {return scrollSpeed;}
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}
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// VARIABLES
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protected RectTransform TargetScrollObject {get; set;}
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protected RectTransform ScrollWindow {get; set;}
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protected ScrollRect TargetScrollRect {get; set;}
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//*** METHODS - PUBLIC ***//
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//*** METHODS - PROTECTED ***//
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protected virtual void Awake (){
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TargetScrollRect = GetComponent<ScrollRect>();
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ScrollWindow = TargetScrollRect.GetComponent<RectTransform>();
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}
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protected virtual void Start (){
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}
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protected virtual void Update (){
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ScrollRectToLevelSelection();
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}
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//*** METHODS - PRIVATE ***//
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private void ScrollRectToLevelSelection (){
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// check main references
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bool referencesAreIncorrect = (TargetScrollRect == null || LayoutListGroup == null || ScrollWindow == null);
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if (referencesAreIncorrect == true){
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return;
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}
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// get calculation references
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EventSystem events = EventSystem.current;
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RectTransform selection =
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events.currentSelectedGameObject != null ?
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events.currentSelectedGameObject.GetComponent<RectTransform>() :
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null;
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// check if scrolling is possible
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if (selection == null ||
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selection.transform.parent != LayoutListGroup.transform)
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{
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return;
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}
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// move the current scroll rect to correct position
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float selectionPos = -selection.anchoredPosition.y;
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float elementHeight = LayoutListGroup.rect.height / LayoutListGroup.transform.childCount;
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float maskHeight = ScrollWindow.rect.height;
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float listPixelAnchor = LayoutListGroup.anchoredPosition.y;
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// get the element offset value depending on the cursor move direction
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float offlimitsValue = 0;
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if (selectionPos < listPixelAnchor){
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offlimitsValue = listPixelAnchor - selectionPos;
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} else if (selectionPos + elementHeight > listPixelAnchor + maskHeight){
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offlimitsValue = (listPixelAnchor + maskHeight) - (selectionPos + elementHeight);
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}
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// move the target scroll rect
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TargetScrollRect.verticalNormalizedPosition +=
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(offlimitsValue / LayoutListGroup.rect.height) * Time.deltaTime * scrollSpeed;
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// save last object we were "heading to" to prevent blocking
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TargetScrollObject = selection;
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}
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}
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}
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