Add script to stetch elements to screen size

Author: adamgraham

Runtime/StretchToScreenSize.cs

@@ -0,0 +1,91 @@
+using UnityEngine;
+
+namespace Zigurous.UI
+{
+    /// <summary>
+    /// Stretches a UI element to the screen size.
+    /// </summary>
+    [RequireComponent(typeof(RectTransform))]
+    public sealed class StretchToScreenSize : MonoBehaviour
+    {
+        /// <summary>
+        /// The RectTransform component of the object.
+        /// </summary>
+        private RectTransform _rectTransform;
+
+        /// <summary>
+        /// Stretches the width of the RectTransform to match the screen width.
+        /// </summary>
+        [Tooltip("Stretches the width of the RectTransform to match the screen width.")]
+        public bool stretchWidth = true;
+
+        /// <summary>
+        /// Stretches the height of the RectTransform to match the screen height.
+        /// </summary>
+        [Tooltip("Stretches the height of the RectTransform to match the screen height.")]
+        public bool stretchHeight = true;
+
+        private void Awake()
+        {
+            _rectTransform = GetComponent<RectTransform>();
+        }
+
+        private void Start()
+        {
+            ScreenSizeListener.Instance.resized += OnScreenResize;
+        }
+
+        private void OnDestroy()
+        {
+            if (ScreenSizeListener.HasInstance) {
+                ScreenSizeListener.Instance.resized -= OnScreenResize;
+            }
+        }
+
+        private void OnEnable()
+        {
+            Stretch();
+        }
+
+        private void OnScreenResize(int width, int height)
+        {
+            if (this.enabled) {
+                Stretch();
+            }
+        }
+
+        /// <summary>
+        /// Stretches the RectTransform to match the screen size.
+        /// </summary>
+        public void Stretch()
+        {
+            Stretch(this.stretchWidth, this.stretchHeight);
+        }
+
+        /// <summary>
+        /// Stretches the RectTransform to match the screen size.
+        /// </summary>
+        /// <param name="stretchWidth">Whether to stretch the width.</param>
+        /// <param name="stretchHeight">Whether to stretch the height.</param>
+        public void Stretch(bool stretchWidth, bool stretchHeight)
+        {
+            if (stretchWidth)
+            {
+                _rectTransform.SetAnchorMinX(0.0f);
+                _rectTransform.SetAnchorMaxX(1.0f);
+                _rectTransform.SetLeft(0.0f);
+                _rectTransform.SetRight(0.0f);
+            }
+
+            if (stretchHeight)
+            {
+                _rectTransform.SetAnchorMinY(0.0f);
+                _rectTransform.SetAnchorMaxY(1.0f);
+                _rectTransform.SetBottom(0.0f);
+                _rectTransform.SetTop(0.0f);
+            }
+        }
+
+    }
+
+}