a575963da9
Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14
169 lines
4.8 KiB
C#
169 lines
4.8 KiB
C#
//
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// System.Web.UI.WebControls.HierarchicalDataBoundControl.cs
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//
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// Authors:
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// Lluis Sanchez Gual (lluis@novell.com)
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//
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// (C) 2004-2010 Novell, Inc (http://www.novell.com)
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections;
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using System.ComponentModel;
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using System.Web.UI;
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using System.Web.UI.WebControls.Adapters;
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namespace System.Web.UI.WebControls
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{
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[DesignerAttribute ("System.Web.UI.Design.WebControls.HierarchicalDataBoundControlDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
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public abstract class HierarchicalDataBoundControl : BaseDataBoundControl
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{
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[IDReferencePropertyAttribute (typeof(HierarchicalDataSourceControl))]
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public override string DataSourceID {
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get {
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object o = ViewState ["DataSourceID"];
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if (o != null)
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return (string)o;
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return String.Empty;
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}
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set {
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if (Initialized)
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RequiresDataBinding = true;
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ViewState ["DataSourceID"] = value;
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}
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}
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protected virtual HierarchicalDataSourceView GetData (string viewPath)
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{
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if (DataSource != null && !String.IsNullOrEmpty (DataSourceID))
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throw new HttpException ();
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IHierarchicalDataSource ds = GetDataSource ();
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if (ds != null)
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return ds.GetHierarchicalView (viewPath);
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if (DataSource is IHierarchicalEnumerable)
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return new ReadOnlyDataSourceView ((IHierarchicalEnumerable) DataSource);
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return null;
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}
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protected virtual IHierarchicalDataSource GetDataSource ()
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{
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if (IsBoundUsingDataSourceID) {
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Control ctrl = FindDataSource ();
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if (ctrl == null)
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throw new HttpException (string.Format ("A control with ID '{0}' could not be found.", DataSourceID));
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if (!(ctrl is IHierarchicalDataSource))
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throw new HttpException (string.Format ("The control with ID '{0}' is not a control of type IHierarchicalDataSource.", DataSourceID));
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return (IHierarchicalDataSource) ctrl;
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}
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return DataSource as IHierarchicalDataSource;
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}
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bool IsDataBound {
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get { return ViewState.GetBool ("DataBound", false); }
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set { ViewState ["DataBound"] = value; }
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}
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protected void MarkAsDataBound ()
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{
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IsDataBound = true;
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}
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protected override void OnDataPropertyChanged ()
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{
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RequiresDataBinding = true;
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}
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protected virtual void OnDataSourceChanged (object sender, EventArgs e)
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{
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RequiresDataBinding = true;
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}
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protected internal override void OnLoad (EventArgs e)
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{
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if (!Initialized) {
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Initialize ();
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ConfirmInitState ();
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}
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base.OnLoad(e);
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}
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void Initialize ()
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{
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if (!Page.IsPostBack || (IsViewStateEnabled && !IsDataBound))
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RequiresDataBinding = true;
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IHierarchicalDataSource ds = GetDataSource ();
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if (ds != null && DataSourceID != "")
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ds.DataSourceChanged += new EventHandler (OnDataSourceChanged);
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}
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protected override void OnPagePreLoad (object sender, EventArgs e)
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{
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base.OnPagePreLoad (sender, e);
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Initialize ();
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}
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protected void InternalPerformDataBinding ()
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{
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HierarchicalDataBoundControlAdapter adapter
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= Adapter as HierarchicalDataBoundControlAdapter;
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if (adapter != null)
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adapter.PerformDataBinding ();
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else
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PerformDataBinding ();
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}
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protected internal virtual void PerformDataBinding ()
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{
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}
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protected override void PerformSelect ()
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{
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OnDataBinding (EventArgs.Empty);
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InternalPerformDataBinding ();
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// The PerformDataBinding method has completed.
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RequiresDataBinding = false;
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MarkAsDataBound ();
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OnDataBound (EventArgs.Empty);
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}
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protected override void ValidateDataSource (object dataSource)
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{
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if (dataSource == null || dataSource is IHierarchicalDataSource || dataSource is IHierarchicalEnumerable)
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return;
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throw new InvalidOperationException ("Invalid data source");
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}
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}
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}
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