From bf96c0d841d2bc81dac0d7e28aa9ab71cd7d6c2a Mon Sep 17 00:00:00 2001
From: Enes Karaosman <eneskaraosman53@gmail.com>
Date: Wed, 10 Apr 2024 09:43:29 +0300
Subject: [PATCH] feat: add readSize view modifiers

---
 README.md                                     | 12 ++++++---
 .../Extensions/View+Extension.swift           | 25 ++++++++++++++++++-
 2 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 35d9e21..da095b2 100644
--- a/README.md
+++ b/README.md
@@ -16,13 +16,19 @@ Table of Contents
 
 # Extensions
 
+```swift
+TextField("Input", text: $text, axis: .vertical)
+    .textFieldStyle(.roundedBorder)
+    .readSize {
+        print("size: \($0)")
+    }
+```
+
 ### Keyboard related modifiers (iOS only)
 
 ```swift
 AwesomeView()
-    .onKeyboardAppear { heigth in
-    
-    }
+    .onKeyboardAppear { heigth in }
 ```
 
 ### Platform based modifiers
diff --git a/Sources/SwiftUIEKtensions/Extensions/View+Extension.swift b/Sources/SwiftUIEKtensions/Extensions/View+Extension.swift
index fe69de3..d88def5 100644
--- a/Sources/SwiftUIEKtensions/Extensions/View+Extension.swift
+++ b/Sources/SwiftUIEKtensions/Extensions/View+Extension.swift
@@ -115,9 +115,32 @@ public extension View {
         return self
         #endif
     }
-        
+
+    /// Read view's size and bind it to `size` property
+    func readSize(to size: Binding<CGSize>) -> some View {
+        readSize { size.wrappedValue = $0 }
+    }
+
+    /// Read view's size and take action on change
+    func readSize(onChange: @escaping (CGSize) -> Void) -> some View {
+        background(
+            GeometryReader { proxy in
+                Color.clear
+                    .preference(
+                        key: SizePreferenceKey.self,
+                        value: proxy.size
+                    )
+            }
+        )
+        .onPreferenceChange(SizePreferenceKey.self, perform: onChange)
+    }
 }
 
+struct SizePreferenceKey: PreferenceKey {
+    static var defaultValue: CGSize = .zero
+
+    static func reduce(value: inout CGSize, nextValue: () -> CGSize) {}
+}
 
 public enum Platform {
     case iOS