Code:
/ FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / xsp / System / Web / UI / WebControls / DataControlField.cs / 1 / DataControlField.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Drawing.Design;
using System.Security.Permissions;
///
/// Creates a field and is the base class for all
[
TypeConverterAttribute(typeof(ExpandableObjectConverter)),
DefaultProperty("HeaderText")
]
[AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
public abstract class DataControlField : IStateManager, IDataSourceViewSchemaAccessor {
private TableItemStyle _itemStyle;
private TableItemStyle _headerStyle;
private TableItemStyle _footerStyle;
private Style _controlStyle;
private StateBag _statebag;
private bool _trackViewState;
private bool _sortingEnabled;
private Control _control;
private object _dataSourceViewSchema;
internal event EventHandler FieldChanged;
///
/// Initializes a new instance of the System.Web.UI.WebControls.Field class.
///
protected DataControlField() {
_statebag = new StateBag();
_dataSourceViewSchema = null;
}
///
/// Gets or sets the text rendered as the AbbreviatedText in some controls.
///
[
Localizable(true),
WebCategory("Accessibility"),
DefaultValue(""),
WebSysDescription(SR.DataControlField_AccessibleHeaderText)
]
public virtual string AccessibleHeaderText {
get {
object o = ViewState["AccessibleHeaderText"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["AccessibleHeaderText"])) {
ViewState["AccessibleHeaderText"] = value;
OnFieldChanged();
}
}
}
///
/// Gets the style properties for the controls inside this field.
///
[
WebCategory("Styles"),
DefaultValue(null),
WebSysDescription(SR.DataControlField_ControlStyle),
DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty)
]
public Style ControlStyle {
get {
if (_controlStyle == null) {
_controlStyle = new Style();
if (IsTrackingViewState)
((IStateManager)_controlStyle).TrackViewState();
}
return _controlStyle;
}
}
internal Style ControlStyleInternal {
get {
return _controlStyle;
}
}
protected Control Control {
get {
return _control;
}
}
///
/// [To be supplied.]
///
protected bool DesignMode {
get {
if (_control != null) {
return _control.DesignMode;
}
return false;
}
}
///
/// Gets the style properties for the footer item.
///
[
WebCategory("Styles"),
DefaultValue(null),
WebSysDescription(SR.DataControlField_FooterStyle),
DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty)
]
public TableItemStyle FooterStyle {
get {
if (_footerStyle == null) {
_footerStyle = new TableItemStyle();
if (IsTrackingViewState)
((IStateManager)_footerStyle).TrackViewState();
}
return _footerStyle;
}
}
///
///
internal TableItemStyle FooterStyleInternal {
get {
return _footerStyle;
}
}
///
/// Gets or sets the text displayed in the footer of the
/// System.Web.UI.WebControls.Field.
///
[
Localizable(true),
WebCategory("Appearance"),
DefaultValue(""),
WebSysDescription(SR.DataControlField_FooterText)
]
public virtual string FooterText {
get {
object o = ViewState["FooterText"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["FooterText"])) {
ViewState["FooterText"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the URL reference to an image to display
/// instead of text on the header of this System.Web.UI.WebControls.Field
/// .
///
[
WebCategory("Appearance"),
DefaultValue(""),
Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)),
UrlProperty(),
WebSysDescription(SR.DataControlField_HeaderImageUrl)
]
public virtual string HeaderImageUrl {
get {
object o = ViewState["HeaderImageUrl"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["HeaderImageUrl"])) {
ViewState["HeaderImageUrl"] = value;
OnFieldChanged();
}
}
}
///
/// Gets the style properties for the header of the System.Web.UI.WebControls.Field. This property is read-only.
///
[
WebCategory("Styles"),
DefaultValue(null),
WebSysDescription(SR.DataControlField_HeaderStyle),
DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty)
]
public TableItemStyle HeaderStyle {
get {
if (_headerStyle == null) {
_headerStyle = new TableItemStyle();
if (IsTrackingViewState)
((IStateManager)_headerStyle).TrackViewState();
}
return _headerStyle;
}
}
///
///
internal TableItemStyle HeaderStyleInternal {
get {
return _headerStyle;
}
}
///
/// Gets or sets the text displayed in the header of the
/// System.Web.UI.WebControls.Field.
///
[
Localizable(true),
WebCategory("Appearance"),
DefaultValue(""),
WebSysDescription(SR.DataControlField_HeaderText)
]
public virtual string HeaderText {
get {
object o = ViewState["HeaderText"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["HeaderText"])) {
ViewState["HeaderText"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets whether the field is visible in Insert mode. Turn off for auto-gen'd db fields
///
[
WebCategory("Behavior"),
DefaultValue(true),
WebSysDescription(SR.DataControlField_InsertVisible)
]
public virtual bool InsertVisible {
get {
object o = ViewState["InsertVisible"];
if (o != null)
return (bool)o;
return true;
}
set {
object oldValue = ViewState["InsertVisible"];
if (oldValue == null || value != (bool)oldValue) {
ViewState["InsertVisible"] = value;
OnFieldChanged();
}
}
}
///
/// Gets the style properties of an item within the System.Web.UI.WebControls.Field. This property is read-only.
///
[
WebCategory("Styles"),
DefaultValue(null),
WebSysDescription(SR.DataControlField_ItemStyle),
DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
PersistenceMode(PersistenceMode.InnerProperty)
]
public TableItemStyle ItemStyle {
get {
if (_itemStyle == null) {
_itemStyle = new TableItemStyle();
if (IsTrackingViewState)
((IStateManager)_itemStyle).TrackViewState();
}
return _itemStyle;
}
}
///
///
internal TableItemStyle ItemStyleInternal {
get {
return _itemStyle;
}
}
[
WebCategory("Behavior"),
DefaultValue(true),
WebSysDescription(SR.DataControlField_ShowHeader)
]
public virtual bool ShowHeader {
get {
object o = ViewState["ShowHeader"];
if (o != null) {
return (bool)o;
}
return true;
}
set {
object oldValue = ViewState["ShowHeader"];
if (oldValue == null || (bool)oldValue != value) {
ViewState["ShowHeader"] = value;
OnFieldChanged();
}
}
}
///
/// Gets or sets the expression used when this field is used to sort the data source> by.
///
[
WebCategory("Behavior"),
DefaultValue(""),
TypeConverter("System.Web.UI.Design.DataSourceViewSchemaConverter, " + AssemblyRef.SystemDesign),
WebSysDescription(SR.DataControlField_SortExpression)
]
public virtual string SortExpression {
get {
object o = ViewState["SortExpression"];
if (o != null)
return(string)o;
return String.Empty;
}
set {
if (!String.Equals(value, ViewState["SortExpression"])) {
ViewState["SortExpression"] = value;
OnFieldChanged();
}
}
}
///
/// Gets the statebag for the System.Web.UI.WebControls.Field. This property is read-only.
///
protected StateBag ViewState {
get {
return _statebag;
}
}
///
/// Gets or sets a value to indicate whether the System.Web.UI.WebControls.Field is visible.
///
[
WebCategory("Behavior"),
DefaultValue(true),
WebSysDescription(SR.DataControlField_Visible)
]
public bool Visible {
get {
object o = ViewState["Visible"];
if (o != null)
return(bool)o;
return true;
}
set {
object oldValue = ViewState["Visible"];
if (oldValue == null || value != (bool)oldValue) {
ViewState["Visible"] = value;
OnFieldChanged();
}
}
}
protected internal DataControlField CloneField() {
DataControlField newField = CreateField();
CopyProperties(newField);
return newField;
}
protected virtual void CopyProperties(DataControlField newField) {
newField.AccessibleHeaderText = AccessibleHeaderText;
newField.ControlStyle.CopyFrom(ControlStyle);
newField.FooterStyle.CopyFrom(FooterStyle);
newField.HeaderStyle.CopyFrom(HeaderStyle);
newField.ItemStyle.CopyFrom(ItemStyle);
newField.FooterText = FooterText;
newField.HeaderImageUrl = HeaderImageUrl;
newField.HeaderText = HeaderText;
newField.InsertVisible = InsertVisible;
newField.ShowHeader = ShowHeader;
newField.SortExpression = SortExpression;
newField.Visible = Visible;
}
protected abstract DataControlField CreateField();
///
/// Extracts the value of the databound cell and inserts the value into the given dictionary
///
public virtual void ExtractValuesFromCell(IOrderedDictionary dictionary, DataControlFieldCell cell, DataControlRowState rowState, bool includeReadOnly) {
return;
}
///
///
public virtual bool Initialize(bool sortingEnabled, Control control) {
_sortingEnabled = sortingEnabled;
_control = control;
return false;
}
///
/// Initializes a cell in the System.Web.UI.WebControls.Field.
///
public virtual void InitializeCell(DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex) {
switch (cellType) {
case DataControlCellType.Header:
{
WebControl headerControl = null;
string sortExpression = SortExpression;
bool sortableHeader = (_sortingEnabled && sortExpression.Length > 0);
string headerImageUrl = HeaderImageUrl;
string headerText = HeaderText;
if (headerImageUrl.Length != 0) {
if (sortableHeader) {
ImageButton sortButton;
IPostBackContainer container = _control as IPostBackContainer;
if (container != null) {
sortButton = new DataControlImageButton(container);
((DataControlImageButton)sortButton).EnableCallback(null); // no command argument for the callback uses Sort
}
else {
sortButton = new ImageButton();
}
sortButton.ImageUrl = HeaderImageUrl;
sortButton.CommandName = DataControlCommands.SortCommandName;
sortButton.CommandArgument = sortExpression;
if (!(sortButton is DataControlImageButton)) {
sortButton.CausesValidation = false;
}
sortButton.AlternateText = headerText;
headerControl = sortButton;
}
else {
Image headerImage = new Image();
headerImage.ImageUrl = headerImageUrl;
headerControl = headerImage;
headerImage.AlternateText = headerText;
}
}
else {
if (sortableHeader) {
LinkButton sortButton;
IPostBackContainer container = _control as IPostBackContainer;
if (container != null) {
sortButton = new DataControlLinkButton(container);
((DataControlLinkButton)sortButton).EnableCallback(null); // no command argument for the callback uses Sort
}
else {
sortButton = new LinkButton();
}
sortButton.Text = headerText;
sortButton.CommandName = DataControlCommands.SortCommandName;
sortButton.CommandArgument = sortExpression;
if (!(sortButton is DataControlLinkButton)) {
sortButton.CausesValidation = false;
}
headerControl = sortButton;
}
else {
if (headerText.Length == 0) {
// the browser does not render table borders for cells with nothing
// in their content, so we add a non-breaking space.
headerText = " ";
}
cell.Text = headerText;
}
}
if (headerControl != null) {
cell.Controls.Add(headerControl);
}
}
break;
case DataControlCellType.Footer:
{
string footerText = FooterText;
if (footerText.Length == 0) {
// the browser does not render table borders for cells with nothing
// in their content, so we add a non-breaking space.
footerText = " ";
}
cell.Text = footerText;
}
break;
}
}
///
/// Determines if the System.Web.UI.WebControls.Field is marked to save its state.
///
protected bool IsTrackingViewState {
get {
return _trackViewState;
}
}
///
/// Loads the state of the System.Web.UI.WebControls.Field.
///
protected virtual void LoadViewState(object savedState) {
if (savedState != null) {
object[] myState = (object[])savedState;
if (myState[0] != null)
((IStateManager)ViewState).LoadViewState(myState[0]);
if (myState[1] != null)
((IStateManager)ItemStyle).LoadViewState(myState[1]);
if (myState[2] != null)
((IStateManager)HeaderStyle).LoadViewState(myState[2]);
if (myState[3] != null)
((IStateManager)FooterStyle).LoadViewState(myState[3]);
}
}
///
/// Raises the FieldChanged event for a System.Web.UI.WebControls.Field.
///
protected virtual void OnFieldChanged() {
if (FieldChanged != null) {
FieldChanged(this, EventArgs.Empty);
}
}
///
/// Saves the current state of the System.Web.UI.WebControls.Field.
///
protected virtual object SaveViewState() {
object propState = ((IStateManager)ViewState).SaveViewState();
object itemStyleState = (_itemStyle != null) ? ((IStateManager)_itemStyle).SaveViewState() : null;
object headerStyleState = (_headerStyle != null) ? ((IStateManager)_headerStyle).SaveViewState() : null;
object footerStyleState = (_footerStyle != null) ? ((IStateManager)_footerStyle).SaveViewState() : null;
object controlStyleState = (_controlStyle != null) ? ((IStateManager)_controlStyle).SaveViewState() : null;
if ((propState != null) ||
(itemStyleState != null) ||
(headerStyleState != null) ||
(footerStyleState != null) ||
(controlStyleState != null)) {
return new object[5] {
propState,
itemStyleState,
headerStyleState,
footerStyleState,
controlStyleState
};
}
return null;
}
internal void SetDirty() {
_statebag.SetDirty(true);
if (_itemStyle != null) {
_itemStyle.SetDirty();
}
if (_headerStyle != null) {
_headerStyle.SetDirty();
}
if (_footerStyle != null) {
_footerStyle.SetDirty();
}
if (_controlStyle != null) {
_controlStyle.SetDirty();
}
}
///
/// Return a textual representation of the column for UI-display purposes.
///
public override string ToString() {
string headerText = HeaderText.Trim();
return headerText.Length > 0 ? headerText : GetType().Name;
}
///
/// Marks the starting point to begin tracking and saving changes to the
/// control as part of the control viewstate.
///
protected virtual void TrackViewState() {
_trackViewState = true;
((IStateManager)ViewState).TrackViewState();
if (_itemStyle != null)
((IStateManager)_itemStyle).TrackViewState();
if (_headerStyle != null)
((IStateManager)_headerStyle).TrackViewState();
if (_footerStyle != null)
((IStateManager)_footerStyle).TrackViewState();
if (_controlStyle != null)
((IStateManager)_controlStyle).TrackViewState();
}
///
/// Override with an empty body if the field's controls all support callback.
/// Otherwise, override and throw a useful error message about why the field can't support callbacks.
///
public virtual void ValidateSupportsCallback() {
throw new NotSupportedException(SR.GetString(SR.DataControlField_CallbacksNotSupported, Control.ID));
}
///
/// Return true if tracking state changes.
///
bool IStateManager.IsTrackingViewState {
get {
return IsTrackingViewState;
}
}
///
/// Load previously saved state.
///
void IStateManager.LoadViewState(object state) {
LoadViewState(state);
}
///
/// Start tracking state changes.
///
void IStateManager.TrackViewState() {
TrackViewState();
}
///
/// Return object containing state changes.
///
object IStateManager.SaveViewState() {
return SaveViewState();
}
#region IDataSourceViewSchemaAccessor implementation
///
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