Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / Primitives / RangeBase.cs / 1 / RangeBase.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System; using System.Collections; using System.ComponentModel; using System.Globalization; using System.Windows.Threading; using System.Windows.Automation.Peers; using System.Windows.Automation.Provider; using System.Windows.Controls; using System.Windows.Controls.Primitives; using System.Windows; using System.Windows.Input; using System.Windows.Media; using MS.Internal; using MS.Utility; namespace System.Windows.Controls.Primitives { ////// The RangeBase class is the base class from which all "range-like" /// controls derive. It defines the relevant events and properties, as /// well as providing handlers for the relevant input events. /// ///[DefaultEvent("ValueChanged"), DefaultProperty("Value")] public abstract class RangeBase : Control { #region Constructors /// /// Default RangeBase constructor /// ////// Automatic determination of current Dispatcher. Use alternative constructor /// that accepts a Dispatcher for best performance. /// protected RangeBase() { } #endregion Constructors #region Events ////// Event correspond to Value changed event /// public static readonly RoutedEvent ValueChangedEvent = EventManager.RegisterRoutedEvent("ValueChanged", RoutingStrategy.Bubble, typeof(RoutedPropertyChangedEventHandler), typeof(RangeBase)); /// /// Add / Remove ValueChangedEvent handler /// [Category("Behavior")] public event RoutedPropertyChangedEventHandlerValueChanged { add { AddHandler(ValueChangedEvent, value); } remove { RemoveHandler(ValueChangedEvent, value); } } #endregion Events #region Properties /// /// The DependencyProperty for the Minimum property. /// Flags: none /// Default Value: 0 /// public static readonly DependencyProperty MinimumProperty = DependencyProperty.Register( "Minimum", typeof(double), typeof(RangeBase), new FrameworkPropertyMetadata( 0.0d, new PropertyChangedCallback(OnMinimumChanged)), new ValidateValueCallback(IsValidDoubleValue)); ////// Minimum restricts the minimum value of the Value property /// [Bindable(true), Category("Behavior")] public double Minimum { get { return (double) GetValue(MinimumProperty); } set { SetValue(MinimumProperty, value); } } ////// Called when MinimumProperty is changed on "d." /// private static void OnMinimumChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { RangeBase ctrl = (RangeBase) d; RangeBaseAutomationPeer peer = UIElementAutomationPeer.FromElement(ctrl) as RangeBaseAutomationPeer; if (peer != null) { peer.RaiseMinimumPropertyChangedEvent((double)e.OldValue, (double)e.NewValue); } ctrl.CoerceValue(MaximumProperty); ctrl.CoerceValue(ValueProperty); ctrl.OnMinimumChanged((double)e.OldValue, (double)e.NewValue); } ////// This method is invoked when the Minimum property changes. /// /// The old value of the Minimum property. /// The new value of the Minimum property. protected virtual void OnMinimumChanged(double oldMinimum, double newMinimum) { } ////// The DependencyProperty for the Maximum property. /// Flags: none /// Default Value: 1 /// public static readonly DependencyProperty MaximumProperty = DependencyProperty.Register( "Maximum", typeof(double), typeof(RangeBase), new FrameworkPropertyMetadata( 1.0d, new PropertyChangedCallback(OnMaximumChanged), new CoerceValueCallback(CoerceMaximum)), new ValidateValueCallback(IsValidDoubleValue)); private static object CoerceMaximum(DependencyObject d, object value) { RangeBase ctrl = (RangeBase) d; double min = ctrl.Minimum; if ((double) value < min) { return min; } return value; } ////// Maximum restricts the maximum value of the Value property /// [Bindable(true), Category("Behavior")] public double Maximum { get { return (double) GetValue(MaximumProperty); } set { SetValue(MaximumProperty, value); } } ////// Called when MaximumProperty is changed on "d." /// private static void OnMaximumChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { RangeBase ctrl = (RangeBase) d; RangeBaseAutomationPeer peer = UIElementAutomationPeer.FromElement(ctrl) as RangeBaseAutomationPeer; if (peer != null) { peer.RaiseMaximumPropertyChangedEvent((double)e.OldValue, (double)e.NewValue); } ctrl.CoerceValue(ValueProperty); ctrl.OnMaximumChanged((double) e.OldValue, (double) e.NewValue); } ////// This method is invoked when the Maximum property changes. /// /// The old value of the Maximum property. /// The new value of the Maximum property. protected virtual void OnMaximumChanged(double oldMaximum, double newMaximum) { } ////// The DependencyProperty for the Value property. /// Flags: None /// Default Value: 0 /// public static readonly DependencyProperty ValueProperty = DependencyProperty.Register( "Value", typeof(double), typeof(RangeBase), new FrameworkPropertyMetadata( 0.0d, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault | FrameworkPropertyMetadataOptions.Journal, new PropertyChangedCallback(OnValueChanged), new CoerceValueCallback(ConstrainToRange)), new ValidateValueCallback(IsValidDoubleValue)); // made this internal because Slider wants to leverage it internal static object ConstrainToRange(DependencyObject d, object value) { RangeBase ctrl = (RangeBase) d; double min = ctrl.Minimum; double v = (double) value; if (v < min) { return min; } double max = ctrl.Maximum; if (v > max) { return max; } return value; } ////// Value property /// [Bindable(true), Category("Behavior")] public double Value { get { return (double) GetValue(ValueProperty); } set { SetValue(ValueProperty, value); } } ////// Called when ValueID is changed on "d." /// private static void OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { RangeBase ctrl = (RangeBase)d; RangeBaseAutomationPeer peer = UIElementAutomationPeer.FromElement(ctrl) as RangeBaseAutomationPeer; if (peer != null) { peer.RaiseValuePropertyChangedEvent((double)e.OldValue, (double)e.NewValue); } ctrl.OnValueChanged((double) e.OldValue, (double) e.NewValue); } ////// This method is invoked when the Value property changes. /// /// The old value of the Value property. /// The new value of the Value property. protected virtual void OnValueChanged(double oldValue, double newValue) { RoutedPropertyChangedEventArgsargs = new RoutedPropertyChangedEventArgs (oldValue, newValue); args.RoutedEvent=RangeBase.ValueChangedEvent; RaiseEvent(args); } /// /// Validate input value in RangeBase (Minimum, Maximum, and Value). /// /// ///Returns False if value is NaN or NegativeInfinity or PositiveInfinity. Otherwise, returns True. private static bool IsValidDoubleValue(object value) { double d = (double)value; return !(DoubleUtil.IsNaN(d) || double.IsInfinity(d)); } ////// Validate input value in RangeBase (SmallChange and LargeChange). /// /// ///Returns False if value is NaN or NegativeInfinity or PositiveInfinity or negative. Otherwise, returns True. private static bool IsValidChange(object value) { double d = (double)value; return IsValidDoubleValue(value) && d >= 0.0; } #region LargeChange Property ////// The DependencyProperty for the LargeChange property. /// public static readonly DependencyProperty LargeChangeProperty = DependencyProperty.Register("LargeChange", typeof(double), typeof(RangeBase), new FrameworkPropertyMetadata(1.0), new ValidateValueCallback(IsValidChange)); ////// LargeChange property /// [Bindable(true), Category("Behavior")] public double LargeChange { get { return (double)GetValue(LargeChangeProperty); } set { SetValue(LargeChangeProperty, value); } } #endregion #region SmallChange Property ////// The DependencyProperty for the SmallChange property. /// public static readonly DependencyProperty SmallChangeProperty = DependencyProperty.Register("SmallChange", typeof(double), typeof(RangeBase), new FrameworkPropertyMetadata(0.1), new ValidateValueCallback(IsValidChange)); ////// SmallChange property /// [Bindable(true), Category("Behavior")] public double SmallChange { get { return (double)GetValue(SmallChangeProperty); } set { SetValue(SmallChangeProperty, value); } } #endregion #endregion #region Method Overrides ////// Gives a string representation of this object. /// public override string ToString() { string typeText = this.GetType().ToString(); double min = double.NaN; double max = double.NaN; double val = double.NaN; bool valuesDefined = false; // Accessing RangeBase properties may be thread sensitive if (CheckAccess()) { min = Minimum; max = Maximum; val = Value; valuesDefined = true; } else { //Not on dispatcher, try posting to the dispatcher with 20ms timeout Dispatcher.Invoke(DispatcherPriority.Send, new TimeSpan(0, 0, 0, 0, 20), new DispatcherOperationCallback(delegate(object o) { min = Minimum; max = Maximum; val = Value; valuesDefined = true; return null; }), null); } // If min, max, value are defined if (valuesDefined) { return SR.Get(SRID.ToStringFormatString_RangeBase, typeText, min, max, val); } // Not able to access the dispatcher return typeText; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- HttpProxyTransportBindingElement.cs
- AlignmentYValidation.cs
- WebAdminConfigurationHelper.cs
- ClonableStack.cs
- DecoratedNameAttribute.cs
- SelectionHighlightInfo.cs
- ResolveNextArgumentWorkItem.cs
- QueueProcessor.cs
- Matrix3DConverter.cs
- QueueProcessor.cs
- ParameterModifier.cs
- VirtualizingStackPanel.cs
- BinaryCommonClasses.cs
- WindowsListViewItemCheckBox.cs
- DoubleLinkList.cs
- GregorianCalendarHelper.cs
- WhereaboutsReader.cs
- ProcessHostConfigUtils.cs
- SessionIDManager.cs
- FieldToken.cs
- XmlBinaryReaderSession.cs
- TreeNodeCollection.cs
- RayMeshGeometry3DHitTestResult.cs
- AccessorTable.cs
- ExternalCalls.cs
- HtmlInputSubmit.cs
- ConstructorNeedsTagAttribute.cs
- PerformanceCounterPermissionEntry.cs
- TextTreeText.cs
- Symbol.cs
- RIPEMD160Managed.cs
- TextViewSelectionProcessor.cs
- WebZone.cs
- ControlCachePolicy.cs
- PropertyTabChangedEvent.cs
- WpfKnownType.cs
- ArgumentsParser.cs
- StaticTextPointer.cs
- DragDropHelper.cs
- DateTimePicker.cs
- ConfigurationElement.cs
- CheckedPointers.cs
- ObjectQuery_EntitySqlExtensions.cs
- securitycriticaldataClass.cs
- PagerSettings.cs
- SoapTransportImporter.cs
- CodeNamespaceCollection.cs
- UndoManager.cs
- MultilineStringConverter.cs
- CatalogZoneBase.cs
- FontCacheUtil.cs
- RoutedEvent.cs
- BamlRecordWriter.cs
- RuntimeIdentifierPropertyAttribute.cs
- Serializer.cs
- FilteredSchemaElementLookUpTable.cs
- TextEditor.cs
- ElementProxy.cs
- LazyTextWriterCreator.cs
- WSSecureConversationDec2005.cs
- XmlSchemaFacet.cs
- RowTypePropertyElement.cs
- TrimSurroundingWhitespaceAttribute.cs
- DataStreamFromComStream.cs
- SiteMapNodeItem.cs
- PointLightBase.cs
- GridView.cs
- Fault.cs
- PeerHopCountAttribute.cs
- TextElementCollectionHelper.cs
- DataGridViewCellFormattingEventArgs.cs
- TextCompositionManager.cs
- SwitchElementsCollection.cs
- ProfileSettings.cs
- CapabilitiesSection.cs
- VisualBrush.cs
- HttpHandlersInstallComponent.cs
- ReaderWriterLockWrapper.cs
- StructuredType.cs
- BookmarkTable.cs
- WebCodeGenerator.cs
- SafeWaitHandle.cs
- IISMapPath.cs
- UserControl.cs
- SessionStateUtil.cs
- String.cs
- _HeaderInfo.cs
- UpdateException.cs
- CultureInfoConverter.cs
- TablePattern.cs
- WebHttpSecurity.cs
- HttpInputStream.cs
- StorageAssociationTypeMapping.cs
- InfoCardMasterKey.cs
- DependencyProperty.cs
- BufferModesCollection.cs
- FrameDimension.cs
- RoutedEventHandlerInfo.cs
- SafeArrayRankMismatchException.cs
- SqlRetyper.cs