106 lines
3.6 KiB
C#
106 lines
3.6 KiB
C#
/// 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;
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using System.Collections;
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using UnityEngine.UI;
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using UnityEngine.EventSystems;
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public class UIScrollToSelection : MonoBehaviour {
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/* ### VARIABLES ============================================================== */
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// settings
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public float scrollSpeed = 10f;
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[SerializeField]
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private RectTransform layoutListGroup;
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// temporary variables
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private RectTransform targetScrollObject;
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private bool scrollToSelection = true;
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// references
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private RectTransform scrollWindow;
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private RectTransform currentCanvas;
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private ScrollRect targetScrollRect;
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/* ### MAIN METHODS =========================================================== */
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// Use this for initialization
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private void Start () {
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targetScrollRect = GetComponent<ScrollRect>();
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scrollWindow = targetScrollRect.GetComponent<RectTransform>();
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currentCanvas = transform.root.GetComponent<RectTransform>();
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}
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// Update is called once per frame
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private void Update () {
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ScrollRectToLevelSelection();
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}
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private void ScrollRectToLevelSelection (){
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// check main references
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bool referencesAreIncorrect =
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(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 = events.currentSelectedGameObject != null ?
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events.currentSelectedGameObject.GetComponent<RectTransform>() :
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null;
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RectTransform lastSelection = events.lastSelectedGameObject != null ?
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events.lastSelectedGameObject.GetComponent<RectTransform>() :
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selection;
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if (selection != targetScrollObject)
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scrollToSelection = true;
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// check if scrolling is possible
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bool isScrollDirectionUnknown =
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(selection == null || lastSelection == null || scrollToSelection == false);
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if (isScrollDirectionUnknown == true || selection.transform.parent != layoutListGroup.transform)
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return;
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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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int direction = (int)Mathf.Sign(selection.anchoredPosition.y - lastSelection.anchoredPosition.y);
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float elementHeight = layoutListGroup.sizeDelta.y / layoutListGroup.transform.childCount;
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float maskHeight = currentCanvas.sizeDelta.y + scrollWindow.sizeDelta.y;
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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 (direction > 0 && selectionPos < listPixelAnchor)
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{
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offlimitsValue = listPixelAnchor - selectionPos;
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}
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if (direction < 0 && selectionPos + elementHeight > listPixelAnchor + maskHeight)
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{
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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.sizeDelta.y) * Time.deltaTime * scrollSpeed;
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// check if we reached our destination
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if (Mathf.Abs(offlimitsValue) < 2f)
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scrollToSelection = false;
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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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/* ### ENUMS ================================================================== */
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/* ### CUSTOM TYPES =========================================================== */
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} |