marcpalmer

//  Created by Marc Palmer on 13/02/2020.
//
//  Usage: Add .debugMetrics(.yellow) or similar to any view

import Foundation
import SwiftUI

/// Renders the width and height of a view
struct DebugMetricsModifier: ViewModifier {
    let colour: Color

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import Combine
import SwiftUI

struct SnapPointPreferenceData {
    let frame: Anchor<CGRect>
}

struct SnapPointPreferenceKey: PreferenceKey {
    typealias Value = SnapPointPreferenceData?
    

marcpalmer

//
//  ContentView.swift
//  ExtendedScrolView
//
//  Created by Marc Palmer on 05/03/2020.
//  Copyright © 2020 Montana Floss Co. Ltd. All rights reserved.
//

import SwiftUI

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import Foundation

// ****************************************************************************************
//
// Example of trying to supply a default type for an associated type in a sub-protocol
// and helper functions that use this default type in an extention on that sub-protocol.
// The natural way to achieve this by defining the typealias in the sub-protocol produces
// a compiler warning and fix-it suggesting use of protocol constraint.
//
// This approach: typealias

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import Foundation

// ****************************************************************************************
//
// Example of trying to supply a default type for an associated type in a sub-protocol
// and helper functions that use this default type in an extention on that sub-protocol.
// The natural way to achieve this by defining the typealias in the sub-protocol produces
// a compiler warning and fix-it suggesting use of protocol constraint.
//
// This approach: Re-stating the associated type as a more specific type

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//
// Paste this code into a playground to see the compiler error and have a shot at a solution.
// All suggestions gratefully received. This is really an exercise in seeing if there is a way to lock down
// intermediary command "binding" types to only those that relate to the same kind of Robot as the CommandBuilder expects.
//
// There is a compiler error when we try to add the actual binding to the builder:
//
// Collaborator with Constrained Self Conformance.playground:63:21: error: cannot convert
// value of type 'CommandBinding<MetalMickey, DanceCommand>' to expected argument type 'CommandBinding<_, _>'
//        builder.add(dance)

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// Demo of iterating over subfeatures that all have a similar action and possibly performing that action.

/// Type-eraser for the action type so we can perform it irresepective of action type
struct AnyConditionalActionBinding<InputType, PresenterType> {
    let _perform: (_ input: InputType, _ presenter: PresenterType) -> Bool
    
    init<FeatureType, ActionType>(_ actionBinding: ConditionalActionBinding<FeatureType, ActionType>) where ActionType.InputType == InputType, ActionType.PresenterType == PresenterType {
        _perform = { (_ input: InputType, _ presenter: PresenterType) -> Bool in
            if let request = actionBinding.request() {
                request.perform(input: input, presenter: presenter)

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#
# Author:  Marc Palmer 
# Twitter: https://twitter.com/marcpalmerdev
# Blog:    https://marcpalmer.net
# 
# This is a .bash_profile file that you can write to your home directory to give
# you a custom shell prompt that will include the git branch and status of your
# current working dir as well as the current Xcode version.
#
# This is really handy when you're running multiple Xcode versions on your machine and have to run

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noInputAction.perform(using: somePresenter)

noPresenterAction.perform(with: someInput)

noPresenterNoInputAction.perform()

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extension StaticActionBinding where ActionType.PresenterType == NoPresenter {
    public func perform(with input: ActionType.InputType,
                        completion: ((ActionOutcome) -> ())? = nil) {
        …
    }
}

extension StaticActionBinding where ActionType.InputType == NoInput {
    public func perform(using presenter: ActionType.PresenterType,
                        completion: ((ActionOutcome) -> ())? = nil) {