Various experiments

submodules/Components/Forms/TextInputComponent/Sources/TextInputComponent.swift

@@ -0,0 +1,86 @@
+import Foundation
+import UIKit
+import ComponentFlow
+import Display
+
+public final class TextInputComponent: Component {
+    public let text: String
+    public let textColor: UIColor
+    public let placeholder: String
+    public let placeholderColor: UIColor
+    public let updated: (String) -> Void
+    
+    public init(
+        text: String,
+        textColor: UIColor,
+        placeholder: String,
+        placeholderColor: UIColor,
+        updated: @escaping (String) -> Void
+    ) {
+        self.text = text
+        self.textColor = textColor
+        self.placeholder = placeholder
+        self.placeholderColor = placeholderColor
+        self.updated = updated
+    }
+    
+    public static func ==(lhs: TextInputComponent, rhs: TextInputComponent) -> Bool {
+        if lhs.text != rhs.text {
+            return false
+        }
+        if lhs.textColor != rhs.textColor {
+            return false
+        }
+        if lhs.placeholder != rhs.placeholder {
+            return false
+        }
+        if lhs.placeholderColor != rhs.placeholderColor {
+            return false
+        }
+        return true
+    }
+    
+    public final class View: UITextField, UITextFieldDelegate {
+        private var component: TextInputComponent?
+        
+        override init(frame: CGRect) {
+            super.init(frame: frame)
+            
+            self.delegate = self
+            self.addTarget(self, action: #selector(self.textFieldChanged(_:)), for: .editingChanged)
+        }
+        
+        required init?(coder: NSCoder) {
+            fatalError("init(coder:) has not been implemented")
+        }
+        
+        @objc private func textFieldChanged(_ textField: UITextField) {
+            self.component?.updated(self.text ?? "")
+        }
+        
+        func update(component: TextInputComponent, availableSize: CGSize, state: EmptyComponentState, environment: Environment<Empty>, transition: Transition) -> CGSize {
+            self.font = UIFont.systemFont(ofSize: 17.0)
+            self.textColor = component.textColor
+            
+            if self.text != component.text {
+                self.text = component.text
+            }
+            
+            self.attributedPlaceholder = NSAttributedString(string: component.placeholder, font: self.font, textColor: component.placeholderColor)
+            
+            let size = CGSize(width: availableSize.width, height: 44.0)
+            
+            self.component = component
+            
+            return size
+        }
+    }
+    
+    public func makeView() -> View {
+        return View(frame: CGRect())
+    }
+    
+    public func update(view: View, availableSize: CGSize, state: EmptyComponentState, environment: Environment<Empty>, transition: Transition) -> CGSize {
+        return view.update(component: self, availableSize: availableSize, state: state, environment: environment, transition: transition)
+    }
+}