Theme preview with black-bar style

--HG--
extra : convert_revision : svn%3A5ff7c347-ad56-4c35-b696-ccb81de16e03/trunk%4046081

src/Orchard.Web/Core/Orchard.Core.csproj

@@ -111,7 +111,10 @@
     <Compile Include="Scheduling\Models\Task.cs" />
     <Compile Include="Settings\Controllers\SiteSettingsDriver.cs" />
     <Compile Include="Settings\Permissions.cs" />
+    <Compile Include="Themes\Preview\IPreviewTheme.cs" />
+    <Compile Include="Themes\Preview\PreviewThemeFilter.cs" />
     <Compile Include="Themes\Services\AdminThemeSelector.cs" />
+    <Compile Include="Themes\Preview\PreviewTheme.cs" />
     <Compile Include="Themes\Services\SafeModeThemeSelector.cs" />
     <Compile Include="Settings\AdminMenu.cs" />
     <Compile Include="Settings\Controllers\AdminController.cs" />
@@ -130,6 +133,7 @@
     <Compile Include="Themes\Records\ThemeSiteSettingsRecord.cs" />
     <Compile Include="Themes\Services\SiteThemeSelector.cs" />
     <Compile Include="Themes\Services\ThemeService.cs" />
+    <Compile Include="Themes\ViewModels\PreviewViewModel.cs" />
     <Compile Include="Themes\ViewModels\ThemesIndexViewModel.cs" />
     <Compile Include="XmlRpc\Controllers\HomeController.cs" />
     <Compile Include="XmlRpc\Controllers\LiveWriterController.cs" />
@@ -184,6 +188,7 @@
     <Content Include="Themes\Theme.png" />
     <Content Include="Themes\Theme.txt" />
     <Content Include="Themes\Styles\site.css" />
+    <Content Include="Themes\Views\Admin\ThemePreview.ascx" />
     <Content Include="Themes\Views\Admin\Install.aspx" />
     <Content Include="Themes\Views\Header.ascx" />
     <Content Include="Themes\Views\Document.aspx" />

src/Orchard.Web/Core/Themes/Controllers/AdminController.cs

@@ -1,6 +1,8 @@
 using System;
+using System.Reflection;
 using System.Web;
 using System.Web.Mvc;
+using Orchard.Core.Themes.Preview;
 using Orchard.Core.Themes.ViewModels;
 using Orchard.Localization;
 using Orchard.Security;
@@ -12,11 +14,13 @@ namespace Orchard.Core.Themes.Controllers {
     [ValidateInput(false)]
     public class AdminController : Controller {
         private readonly IThemeService _themeService;
+        private readonly IPreviewTheme _previewTheme;
         private readonly IAuthorizer _authorizer;
         private readonly INotifier _notifier;
 
-        public AdminController(IThemeService themeService, IAuthorizer authorizer, INotifier notifier) {
+        public AdminController(IThemeService themeService, IPreviewTheme previewTheme, IAuthorizer authorizer, INotifier notifier) {
             _themeService = themeService;
+            _previewTheme = previewTheme;
             _authorizer = authorizer;
             _notifier = notifier;
             T = NullLocalizer.Instance;
@@ -37,6 +41,48 @@ namespace Orchard.Core.Themes.Controllers {
             }
         }
 
+        [HttpPost, FormValueAbsent("submit.Apply"), FormValueAbsent("submit.Cancel")]
+        public ActionResult Preview(string themeName, string returnUrl) {
+            try {
+                if (!_authorizer.Authorize(Permissions.ApplyTheme, T("Couldn't preview the current theme")))
+                    return new HttpUnauthorizedResult();
+                _previewTheme.SetPreviewTheme(themeName);
+                return Redirect(returnUrl ?? "~/");
+            }
+            catch (Exception exception) {
+                _notifier.Error(T("Previewing theme failed: " + exception.Message));
+                return RedirectToAction("Index");
+            }
+        }
+
+        [HttpPost, ActionName("Preview"), FormValueRequired("submit.Apply")]
+        public ActionResult ApplyPreview(string themeName, string returnUrl) {
+            try {
+                if (!_authorizer.Authorize(Permissions.ApplyTheme, T("Couldn't preview the current theme")))
+                    return new HttpUnauthorizedResult();
+                _previewTheme.SetPreviewTheme(null);
+                return Redirect(returnUrl ?? "~/");
+            }
+            catch (Exception exception) {
+                _notifier.Error(T("Previewing theme failed: " + exception.Message));
+                return RedirectToAction("Index");
+            }
+        }
+
+        [HttpPost, ActionName("Preview"), FormValueRequired("submit.Cancel")]
+        public ActionResult CancelPreview(string returnUrl) {
+            try {
+                if (!_authorizer.Authorize(Permissions.ApplyTheme, T("Couldn't preview the current theme")))
+                    return new HttpUnauthorizedResult();
+                _previewTheme.SetPreviewTheme(null);
+                return RedirectToAction("Index");
+            }
+            catch (Exception exception) {
+                _notifier.Error(T("Previewing theme failed: " + exception.Message));
+                return RedirectToAction("Index");
+            }
+        }
+
         [HttpPost]
         public ActionResult Activate(string themeName) {
             try {
@@ -85,5 +131,32 @@ namespace Orchard.Core.Themes.Controllers {
                 return RedirectToAction("Index");
             }
         }
+
+        class FormValueRequiredAttribute : ActionMethodSelectorAttribute {
+            private readonly string _submitButtonName;
+
+            public FormValueRequiredAttribute(string submitButtonName) {
+                _submitButtonName = submitButtonName;
+            }
+
+            public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo) {
+                var value = controllerContext.HttpContext.Request.Form[_submitButtonName];
+                return !string.IsNullOrEmpty(value);
+            }
+        }
+
+        [AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
+        class FormValueAbsentAttribute : ActionMethodSelectorAttribute {
+            private readonly string _submitButtonName;
+
+            public FormValueAbsentAttribute(string submitButtonName) {
+                _submitButtonName = submitButtonName;
+            }
+
+            public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo) {
+                var value = controllerContext.HttpContext.Request.Form[_submitButtonName];
+                return string.IsNullOrEmpty(value);
+            }
+        }
     }
 }

src/Orchard.Web/Core/Themes/Preview/IPreviewTheme.cs

@@ -0,0 +1,6 @@
+namespace Orchard.Core.Themes.Preview {
+    public interface IPreviewTheme : IDependency {
+        string GetPreviewTheme();
+        void SetPreviewTheme(string themeName);
+    }
+}

src/Orchard.Web/Core/Themes/Preview/PreviewTheme.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Web;
+using System.Web.Routing;
+using Orchard.Themes;
+
+namespace Orchard.Core.Themes.Preview {
+    public class PreviewTheme : IPreviewTheme, IThemeSelector {
+        private static readonly string PreviewThemeKey = typeof(PreviewTheme).FullName;
+        private readonly HttpContextBase _httpContext;
+
+        public PreviewTheme(HttpContextBase httpContext) {
+            _httpContext = httpContext;
+        }
+
+        public string GetPreviewTheme() {
+            return Convert.ToString(_httpContext.Session[PreviewThemeKey]);
+        }
+
+        public void SetPreviewTheme(string themeName) {
+            if (string.IsNullOrEmpty(themeName)) {
+                _httpContext.Session.Remove(PreviewThemeKey);
+            }
+            else {
+                _httpContext.Session[PreviewThemeKey] = themeName;
+            }
+        }
+
+        public ThemeSelectorResult GetTheme(RequestContext context) {
+            var previewThemeName = GetPreviewTheme();
+            if (string.IsNullOrEmpty(previewThemeName))
+                return null;
+
+            return new ThemeSelectorResult { Priority = 90, ThemeName = previewThemeName };
+        }
+
+    }
+}

src/Orchard.Web/Core/Themes/Preview/PreviewThemeFilter.cs

@@ -0,0 +1,46 @@
+using System.Linq;
+using System.Web.Mvc;
+using Orchard.Core.Themes.ViewModels;
+using Orchard.Mvc.Filters;
+using Orchard.Mvc.ViewModels;
+using Orchard.Themes;
+
+namespace Orchard.Core.Themes.Preview {
+    public class PreviewThemeFilter : FilterProvider, IResultFilter {
+        private readonly IThemeService _themeService;
+        private readonly IPreviewTheme _previewTheme;
+
+        public PreviewThemeFilter(IThemeService themeService, IPreviewTheme previewTheme) {
+            _themeService = themeService;
+            _previewTheme = previewTheme;
+        }
+
+        public void OnResultExecuting(ResultExecutingContext filterContext) {
+            var viewResult = filterContext.Result as ViewResult;
+            if (viewResult == null)
+                return;
+
+            var baseViewModel = viewResult.ViewData.Model as BaseViewModel;
+            if (baseViewModel == null)
+                return;
+
+            var previewThemeName = _previewTheme.GetPreviewTheme();
+            if (string.IsNullOrEmpty(previewThemeName))
+                return;
+
+            var themes = _themeService.GetInstalledThemes();
+            var model = new PreviewViewModel {
+                Themes = themes.Select(theme => new SelectListItem {
+                    Text = theme.DisplayName,
+                    Value = theme.ThemeName,
+                    Selected = theme.ThemeName == previewThemeName
+                })
+            };
+            baseViewModel.Zones.AddRenderPartial("body:before", "Admin/ThemePreview", model);
+        }
+
+        public void OnResultExecuted(ResultExecutedContext filterContext) {
+
+        }
+    }
+}

src/Orchard.Web/Core/Themes/Services/AdminThemeSelector.cs

@@ -18,7 +18,7 @@ namespace Orchard.Core.Themes.Services {
             if (!context.HttpContext.Request.Path.StartsWith(Path.Combine(siteUrl, "admin").Replace("\\", "/"), true, CultureInfo.InvariantCulture))
                 return null;
 
-            return new ThemeSelectorResult { Priority = 0, ThemeName = "TheAdmin" };
+            return new ThemeSelectorResult { Priority = 100, ThemeName = "TheAdmin" };
         }
     }
 }

src/Orchard.Web/Core/Themes/ViewModels/PreviewViewModel.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+using System.Web.Mvc;
+
+namespace Orchard.Core.Themes.ViewModels {
+    public class PreviewViewModel {
+        public IEnumerable<SelectListItem> Themes { get; set; }
+    }
+}

src/Orchard.Web/Core/Themes/Views/Admin/Index.aspx

@@ -31,6 +31,11 @@
             <%=Html.Encode(theme.HomePage) %>
         </p>
         <div>
+            <% using(Html.BeginFormAntiForgeryPost(Url.Action("Preview"), FormMethod.Post, new { @class = "inline" })) { %>
+                <fieldset>
+                    <button type="submit" title="<%=_Encoded("Preview") %>" name="themeName" value="<%=theme.ThemeName %>"><%=_Encoded("Preview") %></button>
+                </fieldset>
+            <% } %>
             <% using(Html.BeginFormAntiForgeryPost(Url.Action("Activate"), FormMethod.Post, new { @class = "inline" })) { %>
                 <fieldset>
                     <button type="submit" title="<%=_Encoded("Activate") %>" name="themeName" value="<%=theme.ThemeName %>"><%=_Encoded("Activate") %></button>

src/Orchard.Web/Core/Themes/Views/Admin/ThemePreview.ascx

@@ -0,0 +1,25 @@
+<%@ Control Language="C#" Inherits="Orchard.Mvc.ViewUserControl<PreviewViewModel>" %>
+<%@ Import Namespace="Orchard.Core.Themes.ViewModels"%>
+<style type="text/css">
+#themepreview, #themepreview fieldset, #themepreview input, #themepreview select 
+{
+    margin: 0; padding: 0; border:none; font-size: 1em; width:auto; color: #000;
+    font-family:Frutiger,"Frutiger Linotype",Univers,Calibri,"Gill Sans","Gill Sans MT","Myriad Pro",Myriad,"DejaVu Sans Condensed","Liberation Sans","Nimbus Sans L",Tahoma,Geneva,"Helvetica Neue",Helvetica,Arial,sans-serif;
+}
+#themepreview { background: #000; font-size:15px; }
+#themepreview span {color: #ccc;  }
+#themepreview fieldset {  margin: 0; padding: 3px; }
+#themepreview button {  font-size: .8em; }
+</style>
+<div id="themepreview">
+<% using(Html.BeginFormAntiForgeryPost(Url.Action("Preview", new{Controller="Admin", Area="Themes"}), FormMethod.Post, new { @class = "inline" })) { %>
+    <fieldset>    
+        <span><%=T("You are previewing ")%></span>
+        <%=Html.DropDownList("ThemeName", Model.Themes, new {onChange = "this.form.submit();"})%>
+        <button type="submit" title="<%=_Encoded("Preview")%>" name="submit.Preview" value="<%=_Encoded("Preview")%>"><%=_Encoded("Preview")%></button>
+        <button type="submit" title="<%=_Encoded("Apply")%>" name="submit.Apply" value="<%=_Encoded("Apply")%>"><%=_Encoded("Apply") %></button>
+        <button type="submit" title="<%=_Encoded("Cancel")%>" name="submit.Cancel" value="<%=_Encoded("Cancel")%>"><%=_Encoded("Cancel")%></button>
+        <%=Html.Hidden("ReturnUrl", Context.Request.Url)%>
+    </fieldset>
+<% } %>
+</div>