96 lines
3.3 KiB
Swift
96 lines
3.3 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 DesignTokens
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import SwiftUI
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public extension ButtonStyle where Self == ElementActionButtonStyle {
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/// The CTA button style as defined in Compound.
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/// - Parameter size: The control size to use. Defaults to regular.
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/// - Parameter color: The color of the button's background. Defaults to the accent color.
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static func elementAction(_ size: ElementControlSize = .regular,
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color: Color = .element.accent) -> ElementActionButtonStyle {
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ElementActionButtonStyle(size: size, color: color)
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}
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}
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public struct ElementActionButtonStyle: ButtonStyle {
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@Environment(\.isEnabled) private var isEnabled
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@Environment(\.colorScheme) private var colorScheme
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public var size: ElementControlSize
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public var color: Color
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private var verticalPadding: CGFloat { size == .xLarge ? 12 : 4 }
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private var maxWidth: CGFloat? { size == .xLarge ? .infinity : nil }
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private var fontColor: Color {
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// Always white unless disabled with a dark theme.
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.white.opacity(colorScheme == .dark && !isEnabled ? 0.3 : 1.0)
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}
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public init(size: ElementControlSize = .regular, color: Color = .element.accent) {
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self.size = size
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self.color = color
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}
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public func makeBody(configuration: Self.Configuration) -> some View {
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configuration.label
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.padding(.horizontal, 12)
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.padding(.vertical, verticalPadding)
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.frame(maxWidth: maxWidth)
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.foregroundColor(fontColor)
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.font(.element.body)
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.background(color.opacity(backgroundOpacity(when: configuration.isPressed)))
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.cornerRadius(8.0)
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}
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private func backgroundOpacity(when isPressed: Bool) -> CGFloat {
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guard isEnabled else { return 0.3 }
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return isPressed ? 0.6 : 1.0
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}
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}
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public struct ElementActionButtonStyle_Previews: PreviewProvider {
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public static var states: some View {
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VStack {
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Button("Enabled") { /* preview */ }
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.buttonStyle(ElementActionButtonStyle())
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Button("Disabled") { /* preview */ }
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.buttonStyle(ElementActionButtonStyle())
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.disabled(true)
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Button { /* preview */ } label: {
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Text("Clear BG")
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.foregroundColor(.element.alert)
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}
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.buttonStyle(ElementActionButtonStyle(color: .clear))
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Button("Red BG") { /* preview */ }
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.buttonStyle(ElementActionButtonStyle(color: .element.alert))
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}
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.padding()
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}
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public static var previews: some View {
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states
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.preferredColorScheme(.light)
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states
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.preferredColorScheme(.dark)
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}
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}
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