Fixes #4704 (#4728)

* Fixes #4704. Overrides `setEnabled` for DeleteBrowsingDataItem to change view alpha when disabled and to toggle the checkbox `isEnabled` behavior based on the value provided.

* Updates CHANGELOG.md

* Removes unnecessary disabling of checkbox in DeleteBrowsingDataItem.kt
Updates CHANGELOG.md to reflect the component changed.

CHANGELOG.md

@@ -6,6 +6,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 ### Added
+- #4704 - Adds ability to show a different alpha when no elements available to be deleted for a delete browsing data item
 - #4137 - Adds pagination to the history view
 - #3695 - Made search suggestions for other tabs clickable
 

app/src/main/java/org/mozilla/fenix/settings/DeleteBrowsingDataItem.kt

@@ -19,6 +19,11 @@ class DeleteBrowsingDataItem @JvmOverloads constructor(
     defStyleAttr: Int = 0
 ) : ConstraintLayout(context, attrs, defStyleAttr) {
 
+    private companion object {
+        private const val ENABLED_ALPHA = 1f
+        private const val DISABLED_ALPHA = 0.6f
+    }
+
     val titleView: TextView
         get() = title
 
@@ -61,4 +66,9 @@ class DeleteBrowsingDataItem @JvmOverloads constructor(
             subtitle.text = resources.getString(subtitleId)
         }
     }
+
+    override fun setEnabled(enabled: Boolean) {
+        super.setEnabled(enabled)
+        alpha = if (enabled) ENABLED_ALPHA else DISABLED_ALPHA
+    }
 }