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using System.Collections;
using System.Collections.Generic;
using System.Web.Util;
namespace System.Web.UI.WebControls {
public abstract class AutoFieldsGenerator : IAutoFieldGenerator, IStateManager {
private List<AutoGeneratedFieldProperties> _autoGeneratedFieldProperties;
private bool _tracking;
internal bool InDataBinding {
get;
set;
}
internal object DataItem {
get;
set;
}
private ICollection CreateAutoGeneratedFieldsFromFieldProperties() {
List<AutoGeneratedField> autoFields = new List<AutoGeneratedField>();
foreach (AutoGeneratedFieldProperties fieldProperties in AutoGeneratedFieldProperties) {
autoFields.Add(CreateAutoGeneratedFieldFromFieldProperties(fieldProperties));
}
return autoFields;
}
//internal for unit testing.
protected internal List<AutoGeneratedFieldProperties> AutoGeneratedFieldProperties {
get {
if (_autoGeneratedFieldProperties == null) {
_autoGeneratedFieldProperties = new List<AutoGeneratedFieldProperties>();
}
return _autoGeneratedFieldProperties;
}
}
/// <devdoc>
/// Create a single autogenerated field. This function can be overridden to create a different AutoGeneratedField.
/// </devdoc>
protected virtual AutoGeneratedField CreateAutoGeneratedFieldFromFieldProperties(AutoGeneratedFieldProperties fieldProperties) {
AutoGeneratedField field = new AutoGeneratedField(fieldProperties.DataField);
string name = fieldProperties.Name;
((IStateManager)field).TrackViewState();
field.HeaderText = name;
field.SortExpression = name;
field.ReadOnly = fieldProperties.IsReadOnly;
field.DataType = fieldProperties.Type;
return field;
}
protected bool IsTrackingViewState {
get {
return _tracking;
}
}
protected virtual void TrackViewState() {
_tracking = true;
foreach (object fieldProps in AutoGeneratedFieldProperties) {
((IStateManager)fieldProps).TrackViewState();
}
}
protected virtual void LoadViewState(object savedState) {
if (savedState != null) {
object[] autoGenFieldStateArray = (object[])savedState;
int fieldCount = autoGenFieldStateArray.Length;
AutoGeneratedFieldProperties.Clear();
for (int i = 0; i < fieldCount; i++) {
AutoGeneratedFieldProperties fieldProps = new AutoGeneratedFieldProperties();
((IStateManager)fieldProps).TrackViewState();
((IStateManager)fieldProps).LoadViewState(autoGenFieldStateArray[i]);
AutoGeneratedFieldProperties.Add(fieldProps);
}
}
}
protected virtual object SaveViewState() {
// pack up the auto gen'd field properties
int autoGenFieldPropsCount = AutoGeneratedFieldProperties.Count;
object[] autoGenFieldState = new object[autoGenFieldPropsCount];
for (int i = 0; i < autoGenFieldPropsCount; i++) {
autoGenFieldState[i] = ((IStateManager)AutoGeneratedFieldProperties[i]).SaveViewState();
}
return autoGenFieldState;
}
/// <summary>
/// Method that creates the AutoGeneratedFields. This would also typically populate the AutoGeneratedFieldProperties collection
/// which are tracked by view state.
/// </summary>
/// <returns></returns>
public abstract List<AutoGeneratedField> CreateAutoGeneratedFields(object dataItem, Control control);
/// <summary>
/// A flag to indicate whether Enum fields should be generated by this FieldGenerator.
/// If this flag is not set, the FieldGenerator uses <see cref='System.Web.UI.WebControls.Control.RenderingCompatibility'/> of
/// <see cref='System.Web.UI.WebControls.Control'/> to determine the default behavior which is
/// true when RenderingCompatibility is greater than or equal to 4.5 and false in older versions.
/// </summary>
public bool? AutoGenerateEnumFields {
get;
set;
}
#region Implementation of IAutoFieldGenerator
public virtual ICollection GenerateFields(Control control) {
if (InDataBinding) {
//Reset this collection as this would be populated by CreateAutoGenerateFields.
_autoGeneratedFieldProperties = null;
return CreateAutoGeneratedFields(DataItem, control);
}
else {
return CreateAutoGeneratedFieldsFromFieldProperties();
}
}
#endregion
#region Implementation of IStateManager
bool IStateManager.IsTrackingViewState {
get {
return IsTrackingViewState;
}
}
void IStateManager.LoadViewState(object savedState) {
LoadViewState(savedState);
}
object IStateManager.SaveViewState() {
return SaveViewState();
}
void IStateManager.TrackViewState() {
TrackViewState();
}
#endregion
}
}
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