Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / PropertyGridEditorPart.cs / 1 / PropertyGridEditorPart.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls.WebParts { using System; using System.Collections; using System.ComponentModel; using System.Diagnostics; using System.Drawing; using System.Globalization; using System.Security.Permissions; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.Util; using Debug = System.Diagnostics.Debug; using AttributeCollection = System.ComponentModel.AttributeCollection; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class PropertyGridEditorPart : EditorPart { // Controls that accept user input to set property values (textboxes, dropdownlists, etc.) // Should use this in addition to Controls collection, since Controls collection // can be modified by user code. private ArrayList _editorControls; // Array of error messages associated with each editor control private string[] _errorMessages; private static readonly Attribute[] FilterAttributes = new Attribute[] { WebBrowsableAttribute.Yes }; private static readonly WebPart designModeWebPart = new DesignModeWebPart(); private static readonly UrlPropertyAttribute urlPropertyAttribute = new UrlPropertyAttribute(); private const int TextBoxColumns = 30; [Browsable(false), EditorBrowsable(EditorBrowsableState.Never), Themeable(false)] public override string DefaultButton { get { return base.DefaultButton; } set { base.DefaultButton = value; } } public override bool Display { get { if (base.Display == false) { return false; } object editableObject = GetEditableObject(); if (editableObject != null) { if (GetEditableProperties(editableObject, false).Count > 0) { return true; } } return false; } } private ArrayList EditorControls { get { if (_editorControls == null) { _editorControls = new ArrayList(); } return _editorControls; } } private bool HasError { get { foreach (string errorMessage in _errorMessages) { if (errorMessage != null) { return true; } } return false; } } [ WebSysDefaultValue(SR.PropertyGridEditorPart_PartTitle), ] public override string Title { get { string s = (string)ViewState["Title"]; return (s != null) ? s : SR.GetString(SR.PropertyGridEditorPart_PartTitle); } set { ViewState["Title"] = value; } } public override bool ApplyChanges() { object editableObject = GetEditableObject(); Debug.Assert(editableObject != null); if (editableObject == null) { return true; } EnsureChildControls(); int count = Controls.Count; Debug.Assert(count > 0); if (count == 0) { return true; } PropertyDescriptorCollection properties = GetEditableProperties(editableObject, true); for (int i=0; i < properties.Count; i++) { PropertyDescriptor pd = properties[i]; Control editorControl = (Control)EditorControls[i]; try { object value = GetEditorControlValue(editorControl, pd); // If the property is a url, validate protocol (VSWhidbey 290418) if (pd.Attributes.Matches(urlPropertyAttribute) && CrossSiteScriptingValidation.IsDangerousUrl(value.ToString())) { _errorMessages[i] = SR.GetString(SR.EditorPart_ErrorBadUrl); } else { try { pd.SetValue(editableObject, value); } catch (Exception e) { _errorMessages[i] = CreateErrorMessage(e.Message); } } } catch { // If custom errors are enabled, we do not want to render the property type to the browser. // (VSWhidbey 381646) if (Context != null && Context.IsCustomErrorEnabled) { _errorMessages[i] = SR.GetString(SR.EditorPart_ErrorConvertingProperty); } else { _errorMessages[i] = SR.GetString( SR.EditorPart_ErrorConvertingPropertyWithType, pd.PropertyType.FullName); } } } return !HasError; } // In the future, we may want to add Color, Date, etc. private bool CanEditProperty(PropertyDescriptor property) { // Don't show readonly properties if (property.IsReadOnly) { return false; } // Don't show Shared personalizable properties in User mode if (WebPartManager != null && WebPartManager.Personalization != null && WebPartManager.Personalization.Scope == PersonalizationScope.User) { AttributeCollection attributes = property.Attributes; if (attributes.Contains(PersonalizableAttribute.SharedPersonalizable)) { return false; } } // Only show properties that can be converted to/from string return Util.CanConvertToFrom(property.Converter, typeof(string)); } protected internal override void CreateChildControls() { ControlCollection controls = Controls; controls.Clear(); EditorControls.Clear(); object editableObject = GetEditableObject(); if (editableObject != null) { foreach (PropertyDescriptor pd in GetEditableProperties(editableObject, true)) { Control editorControl = CreateEditorControl(pd); EditorControls.Add(editorControl); Controls.Add(editorControl); } _errorMessages = new string[EditorControls.Count]; } // We don't need viewstate enabled on our child controls. Disable for perf. foreach (Control c in controls) { c.EnableViewState = false; } } private Control CreateEditorControl(PropertyDescriptor pd) { Type propertyType = pd.PropertyType; if (propertyType == typeof(bool)) { return new CheckBox(); } else if (typeof(Enum).IsAssignableFrom(propertyType)) { DropDownList dropDownList = new DropDownList(); ICollection standardValues = pd.Converter.GetStandardValues(); foreach (object o in standardValues) { string text = pd.Converter.ConvertToString(o); dropDownList.Items.Add(new ListItem(text)); } return dropDownList; } else { TextBox textBox = new TextBox(); textBox.Columns = TextBoxColumns; return textBox; } } private string GetDescription(PropertyDescriptor pd) { WebDescriptionAttribute attribute = (WebDescriptionAttribute)pd.Attributes[typeof(WebDescriptionAttribute)]; if (attribute != null) { return attribute.Description; } else { return null; } } private string GetDisplayName(PropertyDescriptor pd) { WebDisplayNameAttribute attribute = (WebDisplayNameAttribute)pd.Attributes[typeof(WebDisplayNameAttribute)]; if (attribute != null && !String.IsNullOrEmpty(attribute.DisplayName)) { return attribute.DisplayName; } else { return pd.Name; } } private object GetEditableObject() { if (DesignMode) { return designModeWebPart; } WebPart webPartToEdit = WebPartToEdit; IWebEditable editable = webPartToEdit as IWebEditable; if (editable != null) { return editable.WebBrowsableObject; } return webPartToEdit; } private PropertyDescriptorCollection GetEditableProperties(object editableObject, bool sort) { Debug.Assert(editableObject != null); PropertyDescriptorCollection propDescs = TypeDescriptor.GetProperties(editableObject, FilterAttributes); if (sort) { propDescs = propDescs.Sort(); } PropertyDescriptorCollection filteredPropDescs = new PropertyDescriptorCollection(null); foreach (PropertyDescriptor pd in propDescs) { if (CanEditProperty(pd)) { filteredPropDescs.Add(pd); } } return filteredPropDescs; } private object GetEditorControlValue(Control editorControl, PropertyDescriptor pd) { CheckBox checkBox = editorControl as CheckBox; if (checkBox != null) { return checkBox.Checked; } DropDownList dropDownList = editorControl as DropDownList; if (dropDownList != null) { string value = dropDownList.SelectedValue; return pd.Converter.ConvertFromString(value); } TextBox textBox = (TextBox)editorControl; return pd.Converter.ConvertFromString(textBox.Text); } protected internal override void OnPreRender(EventArgs e) { base.OnPreRender(e); // We want to synchronize the EditorPart to the state of the WebPart on every page load, // so we stay current if the WebPart changes in the background. if (Display && Visible && !HasError) { SyncChanges(); } } protected internal override void RenderContents(HtmlTextWriter writer) { if (Page != null) { Page.VerifyRenderingInServerForm(this); } // HACK: Need this for child controls to be created at design-time when control is inside template EnsureChildControls(); string[] propertyDisplayNames = null; string[] propertyDescriptions = null; object editableObject = GetEditableObject(); if (editableObject != null) { PropertyDescriptorCollection propDescs = GetEditableProperties(editableObject, true); propertyDisplayNames = new string[propDescs.Count]; propertyDescriptions = new string[propDescs.Count]; for (int i=0; i < propDescs.Count; i++) { propertyDisplayNames[i] = GetDisplayName(propDescs[i]); propertyDescriptions[i] = GetDescription(propDescs[i]); } } if (propertyDisplayNames != null) { WebControl[] editorControls = (WebControl[])EditorControls.ToArray(typeof(WebControl)); Debug.Assert(propertyDisplayNames.Length == editorControls.Length && propertyDisplayNames.Length == _errorMessages.Length); RenderPropertyEditors(writer, propertyDisplayNames, propertyDescriptions, editorControls, _errorMessages); } } public override void SyncChanges() { object editableObject = GetEditableObject(); Debug.Assert(editableObject != null); if (editableObject != null) { EnsureChildControls(); int count = 0; foreach (PropertyDescriptor pd in GetEditableProperties(editableObject, true)) { if (CanEditProperty(pd)) { Control editorControl = (Control)EditorControls[count]; SyncChanges(editorControl, pd, editableObject); count++; } } } } private void SyncChanges(Control control, PropertyDescriptor pd, object instance) { Type propertyType = pd.PropertyType; if (propertyType == typeof(bool)) { CheckBox checkBox = (CheckBox)control; checkBox.Checked = (bool)pd.GetValue(instance); } else if (typeof(Enum).IsAssignableFrom(propertyType)) { DropDownList dropDownList = (DropDownList)control; dropDownList.SelectedValue = pd.Converter.ConvertToString(pd.GetValue(instance)); } else { TextBox textBox = (TextBox)control; textBox.Text = pd.Converter.ConvertToString(pd.GetValue(instance)); } } private sealed class DesignModeWebPart : WebPart { [ WebBrowsable(), WebSysWebDisplayName(SR.PropertyGridEditorPart_DesignModeWebPart_BoolProperty) ] public bool BoolProperty { get { return false; } set { } } [ WebBrowsable(), WebSysWebDisplayName(SR.PropertyGridEditorPart_DesignModeWebPart_EnumProperty) ] public SampleEnum EnumProperty { get { return SampleEnum.EnumValue; } set { } } [ WebBrowsable(), WebSysWebDisplayName(SR.PropertyGridEditorPart_DesignModeWebPart_StringProperty) ] public string StringProperty { get { return String.Empty; } set { } } public enum SampleEnum { EnumValue } ////// WebDisplayNameAttribute marks a property, event, or extender with a /// DisplayName for the PropertyGridEditorPart. /// private sealed class WebSysWebDisplayNameAttribute : WebDisplayNameAttribute { private bool replaced; ////// internal WebSysWebDisplayNameAttribute(string DisplayName) : base(DisplayName) { } ///Constructs a new sys DisplayName. ////// public override string DisplayName { get { if (!replaced) { replaced = true; DisplayNameValue = SR.GetString(base.DisplayName); } return base.DisplayName; } } public override object TypeId { get { return typeof(WebDisplayNameAttribute); } } } } } }Retrieves the DisplayName text. ///
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