Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / View / VBIdentifierDesigner.xaml.cs / 1305376 / VBIdentifierDesigner.xaml.cs
//---------------------------------------------------------------- // Copyright (c) Microsoft Corporation. All rights reserved. //--------------------------------------------------------------- namespace System.Activities.Presentation.View { using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Activities.Presentation.View; using System.ComponentModel; using System.Windows.Automation.Peers; using System.Xml.Linq; using System.Reflection; partial class VBIdentifierDesigner : UserControl { public static readonly DependencyProperty IdentifierProperty = DependencyProperty.Register("Identifier", typeof(VBIdentifierName), typeof(VBIdentifierDesigner), new UIPropertyMetadata(OnIdentifierChanged)); public static readonly DependencyProperty NameStringProperty = DependencyProperty.Register("NameString", typeof(string), typeof(VBIdentifierDesigner), new UIPropertyMetadata(null, null, OnNameChanging)); public static readonly DependencyProperty IsReadOnlyProperty = DependencyProperty.Register("IsReadOnly", typeof(bool), typeof(VBIdentifierDesigner)); public event PropertyChangedEventHandler TextBoxPropertyChanged; TextBox textBox; bool isInternalChange; bool checkAgainstXaml; public VBIdentifierName Identifier { get { return (VBIdentifierName)GetValue(IdentifierProperty); } set { SetValue(IdentifierProperty, value); } } public string NameString { get { return (string)GetValue(NameStringProperty); } set { SetValue(NameStringProperty, value); } } public bool IsReadOnly { get { return (bool)GetValue(IsReadOnlyProperty); } set { SetValue(IsReadOnlyProperty, value); } } internal TextBox IdentifierTextBox { get { return this.textBox; } set { if (value != this.textBox) { this.textBox = value; if (this.TextBoxPropertyChanged != null) { this.TextBoxPropertyChanged(this, new PropertyChangedEventArgs("IdentifierTextBox")); } } } } public VBIdentifierDesigner() { InitializeComponent(); this.Loaded += (s, e) => { //when designer gets loaded, get its identifier binding expression with parent control var binding = this.GetBindingExpression(VBIdentifierDesigner.IdentifierProperty); if (null != binding && null != binding.ParentBinding) { //if one exists - define update source exception filter binding.ParentBinding.UpdateSourceExceptionFilter = this.OnBindingException; } }; } void OnTextBoxLoaded(object sender, RoutedEventArgs e) { this.IdentifierTextBox = sender as TextBox; this.IdentifierTextBox.LostKeyboardFocus += this.OnTextBoxLostKeyboardFocus; } void OnTextBoxLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e) { if (this.IdentifierTextBox.IsFocused) { DependencyObject focusScope = FocusManager.GetFocusScope(this.IdentifierTextBox); FocusManager.SetFocusedElement(focusScope, this); } } void OnTextBoxUnloaded(object sender, RoutedEventArgs e) { TextBox textBox = sender as TextBox; textBox.LostKeyboardFocus -= this.OnTextBoxLostKeyboardFocus; this.IdentifierTextBox = null; } object OnBindingException(object sender, Exception err) { //whenever exception occurs, allow ValidationException to be rethrown - this exception is needed to revert invalid value if (err is TargetInvocationException && err.InnerException is ValidationException || err is ValidationException) { throw FxTrace.Exception.AsError( err.InnerException ?? err ); } //simply return null - we don't use error template for this control return null; } static object OnNameChanging(DependencyObject sender, object newValue) { var ctrl = (VBIdentifierDesigner)sender; //before allowing new value to be assigned to property, check if it passes validation return ctrl.OnNameChanging(ctrl.NameString, (string)newValue); } object OnNameChanging(string oldName, string newName) { string result = newName; if (!this.isInternalChange) { try { this.isInternalChange = true; //try to create new Identifier - if this call succeds, set the new value to a property this.Identifier = new VBIdentifierName(this.checkAgainstXaml) { IdentifierName = newName }; } catch (ValidationException) { //in case of validation exception - do not allow new invalid value to be set result = oldName; //if text box is still visible - refresh its Text property to old value if (null != this.textBox) { var binding = this.textBox.GetBindingExpression(TextBox.TextProperty); binding.UpdateTarget(); } } finally { this.isInternalChange = false; } } return result; } static void OnIdentifierChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args) { (sender as VBIdentifierDesigner).OnIdentifierChanged(); } void OnIdentifierChanged() { if (!this.isInternalChange && null != this.Identifier) { this.isInternalChange = true; this.NameString = this.Identifier.IdentifierName; this.isInternalChange = false; this.checkAgainstXaml = this.Identifier.CheckAgainstXaml; } } protected override AutomationPeer OnCreateAutomationPeer() { return new VBIdentiferDesignerAutomationPeer(this); } } class VBIdentiferDesignerAutomationPeer : UIElementAutomationPeer { public VBIdentiferDesignerAutomationPeer(VBIdentifierDesigner owner) : base(owner) { } protected override string GetItemStatusCore() { VBIdentifierDesigner vbIdentifierDesigner = this.Owner as VBIdentifierDesigner; if (vbIdentifierDesigner != null) { VBIdentifierName vbIdentifier = vbIdentifierDesigner.Identifier; XElement itemStatus = new XElement("VBIdentifierStatus", new XAttribute("Status", vbIdentifier.IsValid ? "Valid" : "Invalid"), new XAttribute("WarningMessage", vbIdentifier.ErrorMessage)); return itemStatus.ToString(); } return base.GetItemStatusCore(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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