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BPKHorizontalNavigation.swift
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BPKHorizontalNavigation.swift
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/*
* Backpack - Skyscanner's Design System
*
* Copyright 2018-2023 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
public extension BPKHorizontalNavigation {
enum Size {
case `default`
case small
var titleStyle: BPKFontStyle {
switch self {
case .default: return .label1
case .small: return .label2
}
}
var verticalPadding: CGFloat {
switch self {
case .default: return 12
case .small: return BPKSpacing.md.value
}
}
}
struct Tab {
let title: String
let icon: BPKIcon?
public init(title: String, icon: BPKIcon? = nil) {
self.title = title
self.icon = icon
}
}
}
public struct BPKHorizontalNavigation: View {
let tabs: [Tab]
let size: Size
@Binding var selectedTab: Int
public init(tabs: [Tab], size: Size = .default, selectedTab: Binding<Int>) {
self.tabs = tabs
self.size = size
_selectedTab = selectedTab
}
public var body: some View {
ZStack(alignment: .bottom) {
HStack(spacing: BPKSpacing.none) {
ForEach(0..<tabs.count, id: \.self) { index in
Button {
withAnimation {
selectedTab = index
}
} label: {
TabCellView(
tab: tabs[index],
isSelected: selectedTab == index,
size: size
)
}
}
}
.padding(.vertical, size.verticalPadding)
GeometryReader { proxy in
let width = tabsWidth(for: proxy)
Color(.coreAccentColor)
.frame(width: width)
.offset(x: width * CGFloat(selectedTab))
}
.frame(height: 2)
}
.background(.surfaceDefaultColor)
}
private func tabsWidth(for proxy: GeometryProxy) -> CGFloat {
proxy.size.width / CGFloat(tabs.count)
}
struct TabCellView: View {
let tab: Tab
let isSelected: Bool
let size: Size
var body: some View {
HStack(spacing: .md) {
if let icon = tab.icon {
BPKIconView(icon)
.foregroundColor(foregroundColor)
}
BPKText(tab.title, style: size.titleStyle)
.foregroundColor(foregroundColor)
}
.frame(maxWidth: .infinity)
}
private var foregroundColor: BPKColor {
isSelected ? .coreAccentColor : .textPrimaryColor
}
}
}
struct BPKHorizontalNavigation_Previews: PreviewProvider {
static var previews: some View {
VStack {
BPKHorizontalNavigation(
tabs: [.init(title: "One"), .init(title: "Two"), .init(title: "Three")],
selectedTab: .constant(1)
)
BPKHorizontalNavigation(
tabs: [
.init(title: "One", icon: .flight),
.init(title: "Two", icon: .flight),
.init(title: "Three", icon: .flight)
],
selectedTab: .constant(1)
)
BPKHorizontalNavigation(
tabs: [.init(title: "One"), .init(title: "Two"), .init(title: "Three")],
size: .small,
selectedTab: .constant(2)
)
BPKHorizontalNavigation(
tabs: [
.init(title: "One", icon: .flight),
.init(title: "Two", icon: .flight),
.init(title: "Three", icon: .flight)
],
size: .small,
selectedTab: .constant(0)
)
}
}
}