186 lines
5.8 KiB
Swift
186 lines
5.8 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import SwiftUI
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struct MessageComposerTextField: View {
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@Binding private var text: String
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@State private var dynamicHeight: CGFloat = 100
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@State private var isEditing = false
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private let placeholder: String
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private let maxHeight: CGFloat
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private var showingPlaceholder: Bool {
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text.isEmpty
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}
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init(placeholder: String, text: Binding<String>, maxHeight: CGFloat) {
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self.placeholder = placeholder
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_text = text
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self.maxHeight = maxHeight
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}
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private var placeholderColor: Color {
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.gray
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}
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private var borderColor: Color {
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.element.accent
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}
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private var borderWidth: CGFloat {
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isEditing ? 2.0 : 1.0
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}
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var body: some View {
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let rect = RoundedRectangle(cornerRadius: 8.0)
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return UITextViewWrapper(text: $text,
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calculatedHeight: $dynamicHeight,
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isEditing: $isEditing,
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maxHeight: maxHeight)
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.frame(minHeight: dynamicHeight, maxHeight: dynamicHeight)
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.padding(4.0)
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.background(placeholderView, alignment: .topLeading)
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.clipShape(rect)
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.overlay(rect.stroke(borderColor, lineWidth: borderWidth))
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.animation(.default, value: isEditing)
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}
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@ViewBuilder
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private var placeholderView: some View {
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if showingPlaceholder {
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Text(placeholder)
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.foregroundColor(placeholderColor)
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.padding(.leading, 8.0)
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.padding(.top, 12.0)
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}
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}
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}
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private struct UITextViewWrapper: UIViewRepresentable {
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typealias UIViewType = UITextView
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@Binding var text: String
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@Binding var calculatedHeight: CGFloat
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@Binding var isEditing: Bool
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let maxHeight: CGFloat
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func makeUIView(context: UIViewRepresentableContext<UITextViewWrapper>) -> UITextView {
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let textView = UITextView()
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textView.delegate = context.coordinator
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textView.isEditable = true
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textView.font = UIFont.preferredFont(forTextStyle: .body)
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textView.isSelectable = true
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textView.isUserInteractionEnabled = true
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textView.backgroundColor = UIColor.clear
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textView.returnKeyType = .default
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textView.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
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return textView
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}
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func updateUIView(_ view: UITextView, context: UIViewRepresentableContext<UITextViewWrapper>) {
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if view.text != text {
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view.text = text
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}
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UITextViewWrapper.recalculateHeight(view: view, result: $calculatedHeight, maxHeight: maxHeight)
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}
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func makeCoordinator() -> Coordinator {
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Coordinator(text: $text,
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height: $calculatedHeight,
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isEditing: $isEditing,
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maxHeight: maxHeight)
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}
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fileprivate static func recalculateHeight(view: UIView, result: Binding<CGFloat>, maxHeight: CGFloat) {
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let newSize = view.sizeThatFits(CGSize(width: view.frame.size.width, height: CGFloat.greatestFiniteMagnitude))
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let height = min(maxHeight, newSize.height)
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if result.wrappedValue != height {
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DispatchQueue.main.async {
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result.wrappedValue = height // !! must be called asynchronously
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}
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}
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}
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final class Coordinator: NSObject, UITextViewDelegate {
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var text: Binding<String>
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var calculatedHeight: Binding<CGFloat>
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var isEditing: Binding<Bool>
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let maxHeight: CGFloat
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init(text: Binding<String>, height: Binding<CGFloat>, isEditing: Binding<Bool>, maxHeight: CGFloat) {
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self.text = text
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calculatedHeight = height
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self.isEditing = isEditing
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self.maxHeight = maxHeight
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}
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func textViewDidChange(_ textView: UITextView) {
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text.wrappedValue = textView.text
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UITextViewWrapper.recalculateHeight(view: textView,
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result: calculatedHeight,
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maxHeight: maxHeight)
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}
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func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
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true
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}
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func textViewDidBeginEditing(_ textView: UITextView) {
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isEditing.wrappedValue = true
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}
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func textViewDidEndEditing(_ textView: UITextView) {
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isEditing.wrappedValue = false
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}
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}
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}
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struct MessageComposerTextField_Previews: PreviewProvider {
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static var previews: some View {
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body.preferredColorScheme(.light)
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body.preferredColorScheme(.dark)
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}
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@ViewBuilder
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static var body: some View {
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VStack {
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PreviewWrapper(text: "123")
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PreviewWrapper(text: "")
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}
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}
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struct PreviewWrapper: View {
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@State var text: String
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init(text: String) {
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_text = .init(initialValue: text)
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}
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var body: some View {
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MessageComposerTextField(placeholder: "Placeholder", text: $text, maxHeight: 300)
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}
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}
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}
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