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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Linq;
namespace System.Web.WebPages
{
public sealed class DisplayModeProvider
{
public static readonly string MobileDisplayModeId = "Mobile";
public static readonly string DefaultDisplayModeId = String.Empty;
private static readonly object _displayModeKey = new object();
private static readonly DisplayModeProvider _instance = new DisplayModeProvider();
private readonly List<IDisplayMode> _displayModes = new List<IDisplayMode>
{
new DefaultDisplayMode(MobileDisplayModeId)
{
ContextCondition = context => context.GetOverriddenBrowser().IsMobileDevice
},
new DefaultDisplayMode()
};
internal DisplayModeProvider()
{
// The type is a psuedo-singleton. A user would gain nothing from constructing it since we won't use anything but DisplayModeProvider.Instance internally.
}
/// <summary>
/// Restricts the search for Display Info to Display Modes either equal to or following the current
/// Display Mode in Modes. For example, a page being rendered in the Default Display Mode will not
/// display Mobile partial views in order to achieve a consistent look and feel.
/// </summary>
public bool RequireConsistentDisplayMode { get; set; }
public static DisplayModeProvider Instance
{
get { return _instance; }
}
/// <summary>
/// All Display Modes that are available to handle a request.
/// </summary>
public IList<IDisplayMode> Modes
{
get { return _displayModes; }
}
/// <summary>
/// Returns any IDisplayMode that can handle the given request.
/// </summary>
public IEnumerable<IDisplayMode> GetAvailableDisplayModesForContext(HttpContextBase httpContext, IDisplayMode currentDisplayMode)
{
return GetAvailableDisplayModesForContext(httpContext, currentDisplayMode, RequireConsistentDisplayMode).ToList();
}
internal IEnumerable<IDisplayMode> GetAvailableDisplayModesForContext(HttpContextBase httpContext, IDisplayMode currentDisplayMode, bool requireConsistentDisplayMode)
{
IEnumerable<IDisplayMode> possibleDisplayModes = (requireConsistentDisplayMode && currentDisplayMode != null) ? Modes.SkipWhile(mode => mode != currentDisplayMode) : Modes;
return possibleDisplayModes.Where(mode => mode.CanHandleContext(httpContext));
}
/// <summary>
/// Returns DisplayInfo from the first IDisplayMode in Modes that can handle the given request and locate the virtual path.
/// If currentDisplayMode is not null and RequireConsistentDisplayMode is set to true the search for DisplayInfo will only
/// start with the currentDisplayMode.
/// </summary>
public DisplayInfo GetDisplayInfoForVirtualPath(string virtualPath, HttpContextBase httpContext, Func<string, bool> virtualPathExists, IDisplayMode currentDisplayMode)
{
return GetDisplayInfoForVirtualPath(virtualPath, httpContext, virtualPathExists, currentDisplayMode, RequireConsistentDisplayMode);
}
internal DisplayInfo GetDisplayInfoForVirtualPath(string virtualPath, HttpContextBase httpContext, Func<string, bool> virtualPathExists, IDisplayMode currentDisplayMode,
bool requireConsistentDisplayMode)
{
IEnumerable<IDisplayMode> possibleDisplayModes = GetAvailableDisplayModesForContext(httpContext, currentDisplayMode, requireConsistentDisplayMode);
return possibleDisplayModes.Select(mode => mode.GetDisplayInfo(httpContext, virtualPath, virtualPathExists))
.FirstOrDefault(info => info != null);
}
internal static IDisplayMode GetDisplayMode(HttpContextBase context)
{
return context != null ? context.Items[_displayModeKey] as IDisplayMode : null;
}
internal static void SetDisplayMode(HttpContextBase context, IDisplayMode displayMode)
{
if (context != null)
{
context.Items[_displayModeKey] = displayMode;
}
}
}
}
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