Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / HierarchicalDataSourceDesigner.cs / 1 / HierarchicalDataSourceDesigner.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.Design { using System.ComponentModel; using System.Collections; using System.ComponentModel.Design; using System.Design; using System.Drawing; ///[System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)] public class HierarchicalDataSourceDesigner : ControlDesigner, IHierarchicalDataSourceDesigner { private event EventHandler _dataSourceChangedEvent; private event EventHandler _schemaRefreshedEvent; private int _suppressEventsCount; private bool _raiseDataSourceChangedEvent; private bool _raiseSchemaRefreshedEvent; /// public override DesignerActionListCollection ActionLists { get { DesignerActionListCollection actionLists = new DesignerActionListCollection(); actionLists.AddRange(base.ActionLists); actionLists.Add(new HierarchicalDataSourceDesignerActionList(this)); return actionLists; } } /// /// /// Indicates whether the Configure() method can be called. /// public virtual bool CanConfigure { get { return false; } } ////// /// Indicates whether the RefreshSchema() method can be called. /// public virtual bool CanRefreshSchema { get { return false; } } ////// Raised when the properties of a DataControl have changed. This allows /// a data-bound control designer to take actions to refresh its /// control in the designer. /// public event EventHandler DataSourceChanged { add { _dataSourceChangedEvent += value; } remove { _dataSourceChangedEvent -= value; } } ////// Raised when the schema of the DataSource has changed. This notifies /// a data-bound control designer that the available schema fields have /// changed. /// public event EventHandler SchemaRefreshed { add { _schemaRefreshedEvent += value; } remove { _schemaRefreshedEvent -= value; } } protected bool SuppressingDataSourceEvents { get { return (_suppressEventsCount > 0); } } ////// /// Launches the data source's configuration wizard. /// This method should only be called if the CanConfigure property is true. /// public virtual void Configure() { throw new NotSupportedException(); } ////// /// Gets the design-time HTML. /// public override string GetDesignTimeHtml() { return CreatePlaceHolderDesignTimeHtml(); } public virtual DesignerHierarchicalDataSourceView GetView(string viewPath) { return null; } ////// Raises the DataSourceChanged ecent. /// protected virtual void OnDataSourceChanged(EventArgs e) { if (SuppressingDataSourceEvents) { _raiseDataSourceChangedEvent = true; return; } if (_dataSourceChangedEvent != null) { _dataSourceChangedEvent(this, e); } _raiseDataSourceChangedEvent = false; } ////// Raises the SchemaRefreshed event. /// protected virtual void OnSchemaRefreshed(EventArgs e) { if (SuppressingDataSourceEvents) { _raiseSchemaRefreshedEvent = true; return; } if (_schemaRefreshedEvent != null) { _schemaRefreshedEvent(this, e); } _raiseSchemaRefreshedEvent = false; } public virtual void RefreshSchema(bool preferSilent) { throw new NotSupportedException(); } public virtual void ResumeDataSourceEvents() { if (_suppressEventsCount == 0) { throw new InvalidOperationException(SR.GetString(SR.DataSource_CannotResumeEvents)); } _suppressEventsCount--; if (_suppressEventsCount == 0) { // If this is the last call to resume, we raise the events if necessary if (_raiseDataSourceChangedEvent) { OnDataSourceChanged(EventArgs.Empty); } if (_raiseSchemaRefreshedEvent) { OnSchemaRefreshed(EventArgs.Empty); } } } public virtual void SuppressDataSourceEvents() { _suppressEventsCount++; } private class HierarchicalDataSourceDesignerActionList : DesignerActionList { private HierarchicalDataSourceDesigner _parent; public HierarchicalDataSourceDesignerActionList(HierarchicalDataSourceDesigner parent) : base(parent.Component) { _parent = parent; } public override bool AutoShow { get { return true; } set { } } public void Configure() { _parent.Configure(); } public void RefreshSchema() { _parent.RefreshSchema(false); } public override DesignerActionItemCollection GetSortedActionItems() { DesignerActionItemCollection items = new DesignerActionItemCollection(); if (_parent.CanConfigure) { DesignerActionMethodItem methodItem = new DesignerActionMethodItem(this, "Configure", SR.GetString(SR.DataSourceDesigner_ConfigureDataSourceVerb), SR.GetString(SR.DataSourceDesigner_DataActionGroup), SR.GetString(SR.DataSourceDesigner_ConfigureDataSourceVerbDesc), true); methodItem.AllowAssociate = true; items.Add(methodItem); } if (_parent.CanRefreshSchema) { DesignerActionMethodItem methodItem = new DesignerActionMethodItem(this, "RefreshSchema", SR.GetString(SR.DataSourceDesigner_RefreshSchemaVerb), SR.GetString(SR.DataSourceDesigner_DataActionGroup), SR.GetString(SR.DataSourceDesigner_RefreshSchemaVerbDesc), false); methodItem.AllowAssociate = true; items.Add(methodItem); } return items; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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