79 lines
2.2 KiB
Swift
79 lines
2.2 KiB
Swift
// Copyright 2018-2020 Tokamak contributors
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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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// Created by Max Desiatov on 02/12/2018.
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//
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/// A control that performs an action when triggered.
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///
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/// Available when `Label` conforms to `View`.
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///
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/// A button is created using a `Label`; the `action` initializer argument (a method or closure)
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/// is to be called on click.
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///
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/// @State private var counter: Int = 0
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/// var body: some View {
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/// Button(action: { counter += 1 }) {
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/// Text("\(counter)")
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/// }
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/// }
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///
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/// When your label is `Text`, you can create the button by directly passing a `String`:
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///
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/// @State private var counter: Int = 0
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/// var body: some View {
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/// Button("\(counter)", action: { counter += 1 })
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/// }
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public struct Button<Label>: View where Label: View {
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let button: _Button<Label>
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public init(action: @escaping () -> (), @ViewBuilder label: () -> Label) {
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button = _Button(action: action, label: label())
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}
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public var body: some View {
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button
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}
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}
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public struct _Button<Label>: View where Label: View {
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public let label: Label
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public let action: () -> ()
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@State public var isPressed = false
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@Environment(\.buttonStyle) public var buttonStyle
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public init(action: @escaping () -> (), label: Label) {
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self.label = label
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self.action = action
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}
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public var body: Never {
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neverBody("_Button")
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}
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}
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extension Button where Label == Text {
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public init<S>(_ title: S, action: @escaping () -> ()) where S: StringProtocol {
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self.init(action: action) {
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Text(title)
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}
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}
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}
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extension Button: ParentView {
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public var children: [AnyView] {
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(button.label as? GroupView)?.children ?? [AnyView(button.label)]
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}
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}
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