Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Data / MultiBinding.cs / 2 / MultiBinding.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Defines MultiBinding object, uses a collection of bindings together. // // Specs: [....]/connecteddata/M5%20Specs/UIBinding.mht // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.Collections.ObjectModel; using System.ComponentModel; using System.Diagnostics; using System.Globalization; using System.Windows.Controls; // Validation using System.Windows.Markup; using MS.Internal.Controls; // Validation using MS.Internal.Data; using MS.Utility; namespace System.Windows.Data { ////// Describes a collection of bindings attached to a single property. /// The inner bindings contribute their values to the MultiBinding, /// which combines/converts them into a resultant final value. /// In the reverse direction, the target value is tranlated to /// a set of values that are fed back into the inner bindings. /// [ContentProperty("Bindings")] public class MultiBinding : BindingBase, IAddChild { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- ///Default constructor public MultiBinding() { _bindingCollection = new BindingCollection(this, new BindingCollectionChangedCallback(OnBindingCollectionChanged)); } #region IAddChild ////// Called to Add the object as a Child. /// /// /// Object to add as a child - must have type BindingBase /// void IAddChild.AddChild(Object value) { BindingBase binding = value as BindingBase; if (binding != null) Bindings.Add(binding); else throw new ArgumentException(SR.Get(SRID.ChildHasWrongType, this.GetType().Name, "BindingBase", value.GetType().FullName), "value"); } ////// Called when text appears under the tag in markup /// /// /// Text to Add to the Object /// void IAddChild.AddText(string text) { XamlSerializerUtil.ThrowIfNonWhiteSpaceInAddText(text, this); } #endregion IAddChild //------------------------------------------------------ // // Public Properties // //----------------------------------------------------- ///List of inner bindings [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public CollectionBindings { get { return _bindingCollection; } } /// /// This method is used by TypeDescriptor to determine if this property should /// be serialized. /// [EditorBrowsable(EditorBrowsableState.Never)] public bool ShouldSerializeBindings() { return (Bindings != null && Bindings.Count > 0); } ///Binding type [DefaultValue(BindingMode.Default)] public BindingMode Mode { get { switch (GetFlagsWithinMask(BindingFlags.PropagationMask)) { case BindingFlags.OneWay: return BindingMode.OneWay; case BindingFlags.TwoWay: return BindingMode.TwoWay; case BindingFlags.OneWayToSource: return BindingMode.OneWayToSource; case BindingFlags.OneTime: return BindingMode.OneTime; case BindingFlags.PropDefault: return BindingMode.Default; } Debug.Assert(false, "Unexpected BindingMode value"); return 0; } set { CheckSealed(); ChangeFlagsWithinMask(BindingFlags.PropagationMask, FlagsFrom(value)); } } ///Update type [DefaultValue(UpdateSourceTrigger.PropertyChanged)] public UpdateSourceTrigger UpdateSourceTrigger { get { switch (GetFlagsWithinMask(BindingFlags.UpdateMask)) { case BindingFlags.UpdateOnPropertyChanged: return UpdateSourceTrigger.PropertyChanged; case BindingFlags.UpdateOnLostFocus: return UpdateSourceTrigger.LostFocus; case BindingFlags.UpdateExplicitly: return UpdateSourceTrigger.Explicit; case BindingFlags.UpdateDefault: return UpdateSourceTrigger.Default; } Debug.Assert(false, "Unexpected UpdateSourceTrigger value"); return 0; } set { CheckSealed(); ChangeFlagsWithinMask(BindingFlags.UpdateMask, FlagsFrom(value)); } } ///Raise SourceUpdated event whenever a value flows from target to source [DefaultValue(false)] public bool NotifyOnSourceUpdated { get { return TestFlag(BindingFlags.NotifyOnSourceUpdated); } set { bool currentValue = TestFlag(BindingFlags.NotifyOnSourceUpdated); if (currentValue != value) { CheckSealed(); ChangeFlag(BindingFlags.NotifyOnSourceUpdated, value); } } } ///Raise TargetUpdated event whenever a value flows from source to target [DefaultValue(false)] public bool NotifyOnTargetUpdated { get { return TestFlag(BindingFlags.NotifyOnTargetUpdated); } set { bool currentValue = TestFlag(BindingFlags.NotifyOnTargetUpdated); if (currentValue != value) { CheckSealed(); ChangeFlag(BindingFlags.NotifyOnTargetUpdated, value); } } } ///Raise ValidationError event whenever there is a ValidationError on Update [DefaultValue(false)] public bool NotifyOnValidationError { get { return TestFlag(BindingFlags.NotifyOnValidationError); } set { bool currentValue = TestFlag(BindingFlags.NotifyOnValidationError); if (currentValue != value) { CheckSealed(); ChangeFlag(BindingFlags.NotifyOnValidationError, value); } } } ///Converter to convert the source values to/from the target value [DefaultValue(null)] public IMultiValueConverter Converter { get { return _converter; } set { CheckSealed(); _converter = value; } } ////// The parameter to pass to converter. /// ///[DefaultValue(null)] public object ConverterParameter { get { return _converterParameter; } set { CheckSealed(); _converterParameter = value; } } /// Culture in which to evaluate the converter [DefaultValue(null)] [TypeConverter(typeof(System.Windows.CultureInfoIetfLanguageTagConverter))] public CultureInfo ConverterCulture { get { return _culture; } set { CheckSealed(); _culture = value; } } ////// Collection<ValidationRule> is a collection of ValidationRule /// instances on either a Binding or a MultiBinding. Each of the rules /// is checked for validity on update /// public CollectionValidationRules { get { if (_validationRules == null) _validationRules = new ValidationRuleCollection(); return _validationRules; } } /// /// This method is used by TypeDescriptor to determine if this property should /// be serialized. /// [EditorBrowsable(EditorBrowsableState.Never)] public bool ShouldSerializeValidationRules() { return (_validationRules != null && _validationRules.Count > 0); } ////// called whenever any exception is encountered when trying to update /// the value to the source. The application author can provide its own /// handler for handling exceptions here. If the delegate returns /// null - don�t throw an error or provide a ValidationError. /// Exception - returns the exception itself, we will fire the exception using Async exception model. /// ValidationError - it will set itself as the BindingInError and add it to the element�s Validation errors. /// [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public UpdateSourceExceptionFilterCallback UpdateSourceExceptionFilter { get { return _exceptionFilterCallback; } set { _exceptionFilterCallback = value; } } ///True if an exception during source updates should be considered a validation error. [DefaultValue(false)] public bool ValidatesOnExceptions { get { return TestFlag(BindingFlags.ValidatesOnExceptions); } set { bool currentValue = TestFlag(BindingFlags.ValidatesOnExceptions); if (currentValue != value) { CheckSealed(); ChangeFlag(BindingFlags.ValidatesOnExceptions, value); } } } ///True if a data error in the source item should be considered a validation error. [DefaultValue(false)] public bool ValidatesOnDataErrors { get { return TestFlag(BindingFlags.ValidatesOnDataErrors); } set { bool currentValue = TestFlag(BindingFlags.ValidatesOnDataErrors); if (currentValue != value) { CheckSealed(); ChangeFlag(BindingFlags.ValidatesOnDataErrors, value); } } } //------------------------------------------------------ // // Protected Methods // //------------------------------------------------------ ////// Create an appropriate expression for this Binding, to be attached /// to the given DependencyProperty on the given DependencyObject. /// internal override BindingExpressionBase CreateBindingExpressionOverride(DependencyObject target, DependencyProperty dp, BindingExpressionBase owner) { if (Converter == null) throw new InvalidOperationException(SR.Get(SRID.MultiBindingHasNoConverter)); for (int i = 0; i < Bindings.Count; ++i) { CheckTrigger(Bindings[i]); } return MultiBindingExpression.CreateBindingExpression(target, dp, this, owner); } internal override ValidationRule LookupValidationRule(Type type) { return LookupValidationRule(type, ValidationRulesInternal); } //----------------------------------------------------- // // Internal Methods // //------------------------------------------------------ internal object DoFilterException(object bindExpr, Exception exception) { if (_exceptionFilterCallback != null) return _exceptionFilterCallback(bindExpr, exception); return exception; } internal static void CheckTrigger(BindingBase bb) { Binding binding = bb as Binding; if (binding != null) { if (binding.UpdateSourceTrigger != UpdateSourceTrigger.PropertyChanged && binding.UpdateSourceTrigger != UpdateSourceTrigger.Default) throw new InvalidOperationException(SR.Get(SRID.NoUpdateSourceTriggerForInnerBindingOfMultiBinding)); } } //----------------------------------------------------- // // Internal Properties // //----------------------------------------------------- // same as the public ValidationRules property, but // doesn't try to create an instance if there isn't one there internal CollectionValidationRulesInternal { get { return _validationRules; } } internal override CultureInfo ConverterCultureInternal { get { return ConverterCulture; } } //----------------------------------------------------- // // Private Methods // //------------------------------------------------------ private void OnBindingCollectionChanged() { CheckSealed(); } //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ BindingCollection _bindingCollection; IMultiValueConverter _converter; object _converterParameter; CultureInfo _culture; ValidationRuleCollection _validationRules; UpdateSourceExceptionFilterCallback _exceptionFilterCallback; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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