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namespace System.Web.DynamicData {
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.UI.WebControls;
using System.Web.Hosting;
// This FieldTemplateFactory is used for the simple cases where the user doesn't have
// a FieldTemplate directory but wants to get basic validation logic. In a sense
// it is a smarter version of a BoundField
internal class SimpleFieldTemplateFactory : FieldTemplateFactory {
private static bool? _directoryExists;
public SimpleFieldTemplateFactory()
: this(HostingEnvironment.VirtualPathProvider) {
}
internal SimpleFieldTemplateFactory(VirtualPathProvider vpp)
: base(vpp) {
VirtualPathProvider = vpp;
}
internal VirtualPathProvider VirtualPathProvider {
get;
set;
}
protected virtual bool DirectoryExists {
get {
if (!_directoryExists.HasValue) {
// This is expensive so cache it.
_directoryExists = VirtualPathProvider.DirectoryExists(TemplateFolderVirtualPath);
}
return _directoryExists.Value;
}
}
public override IFieldTemplate CreateFieldTemplate(MetaColumn column, DataBoundControlMode mode, string uiHint) {
// Call Preprocess mode so that we do set the right mode base on the the column's attributes
mode = PreprocessMode(column, mode);
bool readOnly = (mode == DataBoundControlMode.ReadOnly);
// If the folder doesn't exist use the fallback
if (!DirectoryExists) {
return CreateFieldTemplate(readOnly, column);
}
// Always see check if the base found anything first then fall back to the simple field template
IFieldTemplate fieldTemplate = base.CreateFieldTemplate(column, mode, uiHint);
// If there was no field template found and the user specified a uiHint then use the default behavior
if (!String.IsNullOrEmpty(uiHint)) {
return fieldTemplate;
}
return fieldTemplate ?? CreateFieldTemplate(readOnly, column);
}
private IFieldTemplate CreateFieldTemplate(bool readOnly, MetaColumn column) {
// By default we'll support checkbox fields for boolean and a textbox for
// everything else
if (column.ColumnType == typeof(bool)) {
return SimpleFieldTemplateUserControl.CreateBooleanTemplate(readOnly);
}
return SimpleFieldTemplateUserControl.CreateTextTemplate(column, readOnly);
}
}
}
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