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BPKSearchInputSummary.swift
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BPKSearchInputSummary.swift
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/*
* Backpack - Skyscanner's Design System
*
* Copyright 2018-2022 Skyscanner Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import SwiftUI
/// A control that displays an editable text interface for search inputs.
///
/// Use `inputState(_ state: State)` to change the state of the text field.
public struct BPKSearchInputSummary: View {
public enum InputPrefix {
case text(String)
case icon(BPKIcon)
}
struct Icon {
let icon: BPKIcon
let color: BPKColor
}
@Binding private var text: String
@FocusState private var focused: Bool
private let placeholder: String
private let inputPrefix: InputPrefix
private var state: State = .default
/// Creates a `BPKSearchInputSummary`.
///
/// - Parameters:
/// - placeholder: The placeholder text to display when the text field is empty.
/// - inputPrefix: The prefix which would be displayed on the left of text input
/// - text: The text to display in the text field.
public init(
placeholder: String = "",
inputPrefix: InputPrefix = .icon(.search),
_ text: Binding<String>
) {
self.placeholder = placeholder
self.inputPrefix = inputPrefix
self._text = text
}
public var body: some View {
HStack(spacing: .md) {
prefixView
.accessibilityHidden(true)
TextField(placeholder, text: $text, prompt: placeholderView)
.font(style: .bodyDefault)
.foregroundColor(state.textColor)
.disabled(state.isDisabled)
.focused($focused)
.accessibilityElement(children: .combine)
.accessibilityAddTraits(.isSearchField)
accessory
}
.frame(maxWidth: .infinity, minHeight: 48.0)
.padding(.horizontal, BPKSpacing.base)
.background(.surfaceDefaultColor)
.clipShape(RoundedRectangle(cornerRadius: .sm))
.outline(focused ? .textLinkColor : state.borderColor, cornerRadius: .sm, lineWidth: focused ? 2.0 : 1.0)
}
@ViewBuilder
private var accessory: some View {
if let icon = state.icon {
if case let .clear(accessibilityLabel, action) = state {
Button(action: action) {
BPKIconView(icon.icon)
.foregroundColor(icon.color)
}
.opacity(text.isEmpty ? 0.0 : 1.0)
.accessibilityElement(children: .ignore)
.accessibilityLabel(accessibilityLabel)
.accessibilityAddTraits(.isButton)
} else {
BPKIconView(icon.icon)
.foregroundColor(icon.color)
.accessibilityHidden(true)
}
}
}
@ViewBuilder
private var placeholderView: Text {
Text(placeholder)
.foregroundColor(Color(BPKColor.textSecondaryColor.value))
}
@ViewBuilder
private var prefixView: some View {
switch inputPrefix {
case .text(let prefixText):
BPKText(prefixText, style: .bodyDefault)
.foregroundColor(.textSecondaryColor)
case .icon(let icon):
BPKIconView(icon)
.foregroundColor(.textPrimaryColor)
}
}
public func inputState(_ state: State) -> BPKSearchInputSummary {
var result = self
result.state = state
return result
}
}
fileprivate extension TextField {
func font(style: BPKFontStyle) -> some View {
self.font(style.font)
}
}
struct BPKSearchInputSummary_Previews: PreviewProvider {
static var previews: some View {
VStack {
BPKSearchInputSummary(.constant(""))
BPKSearchInputSummary(placeholder: "Enter", .constant(""))
BPKSearchInputSummary(.constant("Value"))
BPKSearchInputSummary(inputPrefix: .text("From"), .constant("Value"))
BPKSearchInputSummary(.constant("Disabled"))
.inputState(.disabled)
BPKSearchInputSummary(.constant("Value"))
.inputState(.error)
BPKSearchInputSummary(.constant("Value"))
.inputState(.clear(accessibilityLabel: "clear", action: {}))
BPKSearchInputSummary(.constant("Value"))
.inputState(.valid)
}
.padding()
.background(.coreEcoColor)
}
}