Re-added the UI dispatcher component for Android and Windows (iOS to …

…come) and re-added the app dialog service.

MADE.App.Views.Dialogs/Buttons/DialogButton.cs

@@ -0,0 +1,85 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="DialogButton.cs" company="MADE Apps">
+//   Copyright (c) MADE Apps.
+// </copyright>
+// <summary>
+//   Defines a button to be used within a application system alert dialog.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace MADE.App.Views.Dialogs.Buttons
+{
+    /// <summary>
+    /// Defines a button to be used within a application system alert dialog.
+    /// </summary>
+    public class DialogButton
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DialogButton"/> class.
+        /// </summary>
+        /// <param name="type">
+        /// The type of button.
+        /// </param>
+        public DialogButton(DialogButtonType type)
+        {
+            this.Type = type;
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DialogButton"/> class with content text.
+        /// </summary>
+        /// <param name="type">
+        /// The type of button.
+        /// </param>
+        /// <param name="content">
+        /// The content text to display on the button.
+        /// </param>
+        public DialogButton(DialogButtonType type, string content)
+        {
+            this.Type = type;
+            this.Content = content;
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DialogButton"/> class with content text and an invoke action.
+        /// </summary>
+        /// <param name="type">
+        /// The type of button.
+        /// </param>
+        /// <param name="content">
+        /// The content text to display on the button.
+        /// </param>
+        /// <param name="invokeAction">
+        /// The action to perform when the button is invoked.
+        /// </param>
+        public DialogButton(DialogButtonType type, string content, DialogButtonInvokedHandler invokeAction)
+        {
+            this.Type = type;
+            this.Content = content;
+            this.InvokeAction = invokeAction;
+        }
+
+        /// <summary>
+        /// Gets the type of button.
+        /// </summary>
+        public DialogButtonType Type { get; }
+
+        /// <summary>
+        /// Gets or sets the content text to display on the button.
+        /// </summary>
+        public string Content { get; set; }
+
+        /// <summary>
+        /// Gets or sets the action to perform when the button is invoked.
+        /// </summary>
+        public DialogButtonInvokedHandler InvokeAction { get; set; }
+
+        /// <summary>
+        /// Invokes the specified <see cref="InvokeAction"/>.
+        /// </summary>
+        public void Invoke()
+        {
+            this.InvokeAction?.Invoke(this);
+        }
+    }
+}

MADE.App.Views.Dialogs/Buttons/DialogButtonInvokedHandler.cs

@@ -0,0 +1,19 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="DialogButtonInvokedHandler.cs" company="MADE Apps">
+//   Copyright (c) MADE Apps.
+// </copyright>
+// <summary>
+//   The event handler for handling when a dialog button has been invoked.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace MADE.App.Views.Dialogs.Buttons
+{
+    /// <summary>
+    /// The event handler for handling when a dialog button has been invoked.
+    /// </summary>
+    /// <param name="button">
+    /// The button.
+    /// </param>
+    public delegate void DialogButtonInvokedHandler(DialogButton button);
+}

MADE.App.Views.Dialogs/Buttons/DialogButtonType.cs

@@ -0,0 +1,32 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="DialogButtonType.cs" company="MADE Apps">
+//   Copyright (c) MADE Apps.
+// </copyright>
+// <summary>
+//   Defines values associated with the type of a dialog button.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace MADE.App.Views.Dialogs.Buttons
+{
+    /// <summary>
+    /// Defines values associated with the type of a dialog button.
+    /// </summary>
+    public enum DialogButtonType
+    {
+        /// <summary>
+        /// The button is neutral and can be used to perform any action.
+        /// </summary>
+        Neutral,
+
+        /// <summary>
+        /// The button is positive and can be used to perform positive actions, such as saving.
+        /// </summary>
+        Positive,
+
+        /// <summary>
+        /// The button is negative and can be used to perform negative actions, such as cancelling.
+        /// </summary>
+        Negative
+    }
+}

MADE.App.Views.Dialogs/IAppDialog.cs

@@ -0,0 +1,190 @@
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="IAppDialog.cs" company="MADE Apps">
+//   Copyright (c) MADE Apps.
+// </copyright>
+// <summary>
+//   Defines an interface for handling application system alert dialogs.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+namespace MADE.App.Views.Dialogs
+{
+    using System;
+    using System.Threading.Tasks;
+
+    using MADE.App.Views.Dialogs.Buttons;
+
+    /// <summary>
+    /// Defines an interface for handling application system alert dialogs.
+    /// </summary>
+    public interface IAppDialog
+    {
+        /// <summary>
+        /// Shows an application system alert dialog with the specified message.
+        /// </summary>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        void Show(string message);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified message and dialog buttons.
+        /// </summary>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        /// <param name="buttons">
+        /// The button definitions for performing actions.
+        /// </param>
+        void Show(string message, params DialogButton[] buttons);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified message, cancellation action and dialog buttons.
+        /// </summary>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        /// <param name="cancelAction">
+        /// The action to perform when the dialog has been cancelled/dismissed.
+        /// </param>
+        /// <param name="buttons">
+        /// The button definitions for performing actions.
+        /// </param>
+        void Show(string message, Action cancelAction, params DialogButton[] buttons);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified title and message.
+        /// </summary>
+        /// <param name="title">
+        /// The title to display.
+        /// </param>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        void Show(string title, string message);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified title, message and dialog buttons.
+        /// </summary>
+        /// <param name="title">
+        /// The title to display.
+        /// </param>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        /// <param name="buttons">
+        /// The button definitions for performing actions.
+        /// </param>
+        void Show(string title, string message, params DialogButton[] buttons);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified title, message, cancellation action and dialog buttons.
+        /// </summary>
+        /// <param name="title">
+        /// The title to display.
+        /// </param>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        /// <param name="cancelAction">
+        /// The action to perform when the dialog has been cancelled/dismissed.
+        /// </param>
+        /// <param name="buttons">
+        /// The button definitions for performing actions.
+        /// </param>
+        void Show(string title, string message, Action cancelAction, params DialogButton[] buttons);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified message.
+        /// </summary>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        /// <returns>
+        /// An asynchronous operation.
+        /// </returns>
+        Task ShowAsync(string message);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified message and dialog buttons.
+        /// </summary>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        /// <param name="buttons">
+        /// The button definitions for performing actions.
+        /// </param>
+        /// <returns>
+        /// An asynchronous operation.
+        /// </returns>
+        Task ShowAsync(string message, params DialogButton[] buttons);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified message, cancellation action and dialog buttons.
+        /// </summary>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        /// <param name="cancelAction">
+        /// The action to perform when the dialog has been cancelled/dismissed.
+        /// </param>
+        /// <param name="buttons">
+        /// The button definitions for performing actions.
+        /// </param>
+        /// <returns>
+        /// An asynchronous operation.
+        /// </returns>
+        Task ShowAsync(string message, Action cancelAction, params DialogButton[] buttons);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified title and message.
+        /// </summary>
+        /// <param name="title">
+        /// The title to display.
+        /// </param>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        /// <returns>
+        /// An asynchronous operation.
+        /// </returns>
+        Task ShowAsync(string title, string message);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified title, message and dialog buttons.
+        /// </summary>
+        /// <param name="title">
+        /// The title to display.
+        /// </param>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        /// <param name="buttons">
+        /// The button definitions for performing actions.
+        /// </param>
+        /// <returns>
+        /// An asynchronous operation.
+        /// </returns>
+        Task ShowAsync(string title, string message, params DialogButton[] buttons);
+
+        /// <summary>
+        /// Shows an application system alert dialog with the specified title, message, cancellation action and dialog buttons.
+        /// </summary>
+        /// <param name="title">
+        /// The title to display.
+        /// </param>
+        /// <param name="message">
+        /// The message to display.
+        /// </param>
+        /// <param name="cancelAction">
+        /// The action to perform when the dialog has been cancelled/dismissed.
+        /// </param>
+        /// <param name="buttons">
+        /// The button definitions for performing actions.
+        /// </param>
+        /// <returns>
+        /// An asynchronous operation.
+        /// </returns>
+        Task ShowAsync(string title, string message, Action cancelAction, params DialogButton[] buttons);
+    }
+}