private static List <FormRow> CreateRows(IEnumerable <AttrElementTuple> elements,
int gridLength)
{
var rows = new List <FormRow>();
List <FormElement> currentLine = null;
foreach (var item in elements)
{
var attr = item.Attr;
var element = item.Element;
if (!attr.StartsNewRow)
{
rows.Add(new FormRow(false, attr.RowSpan)
{
Elements =
{
new FormElementContainer(0, gridLength, new List <FormElement> {
element
})
}
});
currentLine = null;
continue;
}
if (attr.ShareLine)
{
if (currentLine != null)
{
currentLine.Add(element);
}
else
{
currentLine = new List <FormElement> {
element
};
var row = new FormRow();
row.Elements.Add(new FormElementContainer(0, gridLength, currentLine));
rows.Add(row);
}
}
else
{
rows.Add(new FormRow
{
Elements =
{
new FormElementContainer(0, gridLength, new List <FormElement> {
element
})
}
});
currentLine = null;
}
}
return(rows);
}
private FormDefinition BuildDefinition(Type type)
{
// Only classes are allowed.
// Primitives should be retrieved from prebuilt definitions.
if (!type.IsClass || typeof(MulticastDelegate).IsAssignableFrom(type.BaseType))
{
return(null);
}
var formDefinition = new FormDefinition(type);
var mode = DefaultFields.AllExcludingReadonly;
var grid = new[] { 1d };
var beforeFormContent = new List <AttrElementTuple>();
var afterFormContent = new List <AttrElementTuple>();
foreach (var attribute in type.GetCustomAttributes())
{
switch (attribute)
{
case ResourceAttribute resource:
formDefinition.Resources.Add(resource.Name, resource.Value is string expr
? (IValueProvider)BoundExpression.Parse(expr)
: new LiteralValue(resource.Value));
break;
case FormAttribute form:
mode = form.Mode;
grid = form.Grid;
if (grid == null || grid.Length < 1)
{
grid = new[] { 1d };
}
break;
case FormContentAttribute contentAttribute:
if (contentAttribute.Placement == Placement.After)
{
afterFormContent.Add(new AttrElementTuple(contentAttribute, contentAttribute.GetElement()));
}
else if (contentAttribute.Placement == Placement.Before)
{
beforeFormContent.Add(new AttrElementTuple(contentAttribute,
contentAttribute.GetElement()));
}
break;
case MetaAttribute meta:
if (!string.IsNullOrEmpty(meta.Name))
{
formDefinition.Metadata[meta.Name] = meta.Value;
}
break;
}
}
beforeFormContent.Sort((a, b) => a.Attr.Position.CompareTo(b.Attr.Position));
afterFormContent.Sort((a, b) => a.Attr.Position.CompareTo(b.Attr.Position));
var gridLength = grid.Length;
// Pass one - get list of valid properties.
var properties = Utilities
.GetProperties(type, mode)
.Select(p => new PropertyInfoWrapper(p))
.ToArray();
// Pass two - build form elements.
var elements = new List <ElementWrapper>();
foreach (var property in properties)
{
var deserializer = TryGetDeserializer(property.PropertyType);
// Query property builders.
var element = Build(property, deserializer);
if (element == null)
{
// Unhandled properties are ignored.
continue;
}
// Pass three - initialize elements.
foreach (var initializer in FieldInitializers)
{
initializer.Initialize(element, property, deserializer);
}
var wrapper = new ElementWrapper(element, property);
// Set layout.
var attr = property.GetCustomAttribute <FieldAttribute>();
if (attr != null)
{
wrapper.Position = attr.Position;
wrapper.Row = attr.Row;
wrapper.Column = attr.Column;
wrapper.ColumnSpan = attr.ColumnSpan;
}
elements.Add(wrapper);
}
// Pass four - order elements.
elements = elements.OrderBy(element => element.Position).ToList();
// Pass five - group rows and calculate layout.
var layout = PerformLayout(grid, elements);
// Pass six - add attached elements.
var rows = new List <FormRow>();
// Before form.
rows.AddRange(CreateRows(beforeFormContent, gridLength));
foreach (var row in layout)
{
var before = new List <AttrElementTuple>();
var after = new List <AttrElementTuple>();
foreach (var element in row.Elements)
{
var property = element.Property;
foreach (var attr in property.GetCustomAttributes <FormContentAttribute>())
{
if (attr.Placement == Placement.Before)
{
before.Add(new AttrElementTuple(attr, attr.GetElement()));
}
else if (attr.Placement == Placement.After)
{
after.Add(new AttrElementTuple(attr, attr.GetElement()));
}
}
}
before.Sort((a, b) => a.Attr.Position.CompareTo(b.Attr.Position));
after.Sort((a, b) => a.Attr.Position.CompareTo(b.Attr.Position));
// Before element.
rows.AddRange(CreateRows(before, gridLength));
// Field row.
var formRow = new FormRow();
formRow.Elements.AddRange(
row.Elements.Select(w =>
{
var inlineElements = w.Property
.GetCustomAttributes <FormContentAttribute>()
.Where(attr => attr.Placement == Placement.Inline)
.Select(attr => new AttrElementTuple(attr, attr.GetElement()))
.OrderBy(tuple => tuple.Attr.Position)
.ToList();
w.Element.LinePosition = (Position)(-1);
if (inlineElements.Count != 0)
{
return(new FormElementContainer(w.Column, w.ColumnSpan,
inlineElements
.Select(t => t.Element)
.Concat(new[] { w.Element })
.ToList()));
}
return(new FormElementContainer(w.Column, w.ColumnSpan, w.Element));
}));
rows.Add(formRow);
// After element.
rows.AddRange(CreateRows(after, gridLength));
}
// After form.
rows.AddRange(CreateRows(afterFormContent, gridLength));
// Wrap up everything.
formDefinition.Grid = grid;
formDefinition.FormRows = rows;
formDefinition.Freeze();
foreach (var element in formDefinition.FormRows.SelectMany(r => r.Elements).SelectMany(c => c.Elements))
{
element.Freeze();
}
return(formDefinition);
}
