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//------------------------------------------------------------------------------
// <copyright file="DataPagerField.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
using System;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Web;
using System.Web.UI;
namespace System.Web.UI.WebControls {
public abstract class DataPagerField : IStateManager {
private StateBag _stateBag;
private bool _trackViewState;
private DataPager _dataPager;
internal event EventHandler FieldChanged;
protected DataPagerField() {
_stateBag = new StateBag();
}
protected StateBag ViewState {
get {
return _stateBag;
}
}
protected bool IsTrackingViewState {
get {
return _trackViewState;
}
}
protected DataPager DataPager {
get {
return _dataPager;
}
}
protected bool QueryStringHandled {
get {
return DataPager.QueryStringHandled;
}
set {
DataPager.QueryStringHandled = value;
}
}
protected string QueryStringValue {
get {
return DataPager.QueryStringValue;
}
}
[
Category("Behavior"),
DefaultValue(true),
ResourceDescription("DataPagerField_Visible")
]
public bool Visible {
get {
object o = ViewState["Visible"];
if (o != null) {
return (bool)o;
}
return true;
}
set {
if (value != Visible) {
ViewState["Visible"] = value;
OnFieldChanged();
}
}
}
protected internal DataPagerField CloneField() {
DataPagerField newField = CreateField();
CopyProperties(newField);
return newField;
}
protected virtual void CopyProperties(DataPagerField newField) {
newField.Visible = Visible;
}
public abstract void CreateDataPagers(DataPagerFieldItem container, int startRowIndex, int maximumRows, int totalRowCount, int fieldIndex);
protected abstract DataPagerField CreateField();
[SuppressMessage("Microsoft.Design", "CA1055:UriReturnValuesShouldNotBeStrings",
Justification="Return value matches HyperLink.NavigateUrl property type.")]
protected string GetQueryStringNavigateUrl(int pageNumber) {
return DataPager.GetQueryStringNavigateUrl(pageNumber);
}
[SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers", MessageId = "0#")]
public abstract void HandleEvent(CommandEventArgs e);
protected virtual void LoadViewState(object savedState) {
if (savedState != null) {
object[] myState = (object[])savedState;
if (myState[0] != null)
((IStateManager)ViewState).LoadViewState(myState[0]);
}
}
protected virtual void OnFieldChanged() {
if (FieldChanged != null) {
FieldChanged(this, EventArgs.Empty);
}
}
protected virtual object SaveViewState() {
object state = ((IStateManager)ViewState).SaveViewState();
if ((state != null)) {
return new object[1] {
state
};
}
return null;
}
internal void SetDirty() {
_stateBag.SetDirty(true);
}
internal void SetDataPager(DataPager dataPager) {
_dataPager = dataPager;
}
protected virtual void TrackViewState() {
_trackViewState = true;
((IStateManager)ViewState).TrackViewState();
}
#region IStateManager
/// <internalonly/>
/// <devdoc>
/// Return true if tracking state changes.
/// </devdoc>
bool IStateManager.IsTrackingViewState {
get {
return IsTrackingViewState;
}
}
/// <internalonly/>
/// <devdoc>
/// Load previously saved state.
/// </devdoc>
void IStateManager.LoadViewState(object state) {
LoadViewState(state);
}
/// <internalonly/>
/// <devdoc>
/// Start tracking state changes.
/// </devdoc>
void IStateManager.TrackViewState() {
TrackViewState();
}
/// <internalonly/>
/// <devdoc>
/// Return object containing state changes.
/// </devdoc>
object IStateManager.SaveViewState() {
return SaveViewState();
}
#endregion IStateManager
}
}
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