50 lines
2.3 KiB
C#
50 lines
2.3 KiB
C#
#region File Description
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//-----------------------------------------------------------------------------
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// IScreenFactory.cs
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//
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// Microsoft XNA Community Game Platform
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// Copyright (C) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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#endregion
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using System;
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namespace GameStateManagement
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{
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/// <summary>
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/// Defines an object that can create a screen when given its type.
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///
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/// The ScreenManager attempts to handle tombstoning on Windows Phone by creating an XML
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/// document that has a list of the screens currently in the manager. When the game is
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/// reactivated, the ScreenManager needs to create instances of those screens. However
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/// since there is no restriction that a particular GameScreen subclass has a parameterless
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/// constructor, there is no way the ScreenManager alone could create those instances.
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///
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/// IScreenFactory fills this gap by providing an interface the game should implement to
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/// act as a translation from type to instance. The ScreenManager locates the IScreenFactory
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/// from the Game.Services collection and passes each screen type to the factory, expecting
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/// to get the correct GameScreen out.
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///
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/// If your game screens all have parameterless constructors, the minimal implementation of
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/// this interface would look like this:
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///
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/// return Activator.CreateInstance(screenType) as GameScreen;
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///
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/// If you have screens with constructors that take arguments, you will need to ensure that
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/// you can read these arguments from storage or generate new ones, then construct the screen
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/// based on the type.
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///
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/// The ScreenFactory type in the sample game has the minimal implementation along with some
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/// extra comments showing a potentially more complex example of how to implement IScreenFactory.
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/// </summary>
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public interface IScreenFactory
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{
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/// <summary>
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/// Creates a GameScreen from the given type.
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/// </summary>
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/// <param name="screenType">The type of screen to create.</param>
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/// <returns>The newly created screen.</returns>
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GameScreen CreateScreen(Type screenType);
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}
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}
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