/// <summary>
/// Renders a page block by finding the template and applying the specified model to it
/// </summary>
/// <param name="viewContext">ViewContext is required so we can render the razor view.</param>
/// <param name="pageViewModel">The view model for the page being rendered.</param>
/// <param name="blockViewModel">The view model for the module being rendered.</param>
/// <returns>The rendered module html.</returns>
public async Task <string> RenderBlockAsync(
ViewContext viewContext,
IEditablePageViewModel pageViewModel,
IEntityVersionPageBlockRenderDetails blockViewModel
)
{
var displayData = GetBlockDisplayData(pageViewModel, blockViewModel);
string viewPath = GetViewPath(blockViewModel);
string html = await _razorViewRenderer.RenderViewAsync(viewContext, viewPath, displayData);
if (pageViewModel.IsPageEditMode)
{
html = ParseBlockHtmlForEditing(html, blockViewModel);
}
return(html);
}
private string GetViewPath(IEntityVersionPageBlockRenderDetails blockViewModel)
{
string viewPath;
string fileName = blockViewModel.BlockType.FileName;
if (blockViewModel.Template == null)
{
viewPath = _pageBlockTypeViewFileLocator.GetPathByFileName(fileName);
}
else
{
viewPath = _pageBlockTypeViewFileLocator.GetTemplatePathByTemplateFileName(fileName, blockViewModel.Template.FileName);
}
if (viewPath == null)
{
return(null);
}
return("~" + viewPath);
}
/// <summary>
/// Parses the rendered html string of a block, when in edit mode. It adds attributes used for hovering and interacting
/// with a block in siteviewer mode. It also adds a css class.
/// </summary>
private string ParseBlockHtmlForEditing(string blockHtml, IEntityVersionPageBlockRenderDetails blockViewModel)
{
string entityType = blockViewModel is CustomEntityVersionPageBlockRenderDetails ? "custom-entity" : "page";
var attrs = new Dictionary <string, string>();
attrs.Add("class", "cofoundry-sv__block");
attrs.Add("data-cms-" + entityType + "-region-block", string.Empty);
if (blockViewModel != null)
{
attrs.Add("data-cms-version-block-id", blockViewModel.EntityVersionPageBlockId.ToString());
attrs.Add("data-cms-page-block-type-id", blockViewModel.BlockType.PageBlockTypeId.ToString());
attrs.Add("data-cms-page-block-title", blockViewModel.BlockType.Name.ToString());
}
var parser = new HtmlParser();
var document = parser.Parse(blockHtml.Trim());
var elements = document.Body.Children;
if (elements.Length == 1)
{
var element = elements.Single();
if (element.NodeType == NodeType.Element)
{
AngleSharpHelper.MergeAttributes(element, attrs);
return(element.OuterHtml);
}
}
var wrapper = document.CreateElement("div");
AngleSharpHelper.WrapChildren(document.Body, wrapper);
AngleSharpHelper.MergeAttributes(wrapper, attrs);
return(wrapper.OuterHtml);
}
private IPageBlockTypeDisplayModel GetBlockDisplayData(IEditablePageViewModel pageViewModel, IEntityVersionPageBlockRenderDetails blockViewModel)
{
var displayData = blockViewModel.DisplayModel as IPageBlockWithParentPageData;
if (displayData != null)
{
displayData.ParentPage = pageViewModel;
}
return(blockViewModel.DisplayModel);
}