Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / ComboBoxItem.cs / 1305600 / ComboBoxItem.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: ComboBoxItem.cs // //--------------------------------------------------------------------------- using MS.Internal; using MS.Internal.KnownBoxes; using System; using System.ComponentModel; using System.Diagnostics; using System.Windows.Threading; using System.Windows.Automation; using System.Windows.Automation.Provider; using System.Windows.Media; using System.Windows.Input; using System.Windows.Controls.Primitives; using System.Windows.Shapes; namespace System.Windows.Controls { ////// Control that implements a selectable item inside a ComboBox. /// [Localizability(LocalizationCategory.ComboBox)] #if OLD_AUTOMATION [Automation(AccessibilityControlType = "ListItem")] #endif public class ComboBoxItem : ListBoxItem { //------------------------------------------------------------------- // // Constructors // //------------------------------------------------------------------- #region Constructors ////// Default DependencyObject constructor /// ////// Automatic determination of current Dispatcher. Use alternative constructor /// that accepts a Dispatcher for best performance. /// public ComboBoxItem() : base() { } static ComboBoxItem() { DefaultStyleKeyProperty.OverrideMetadata(typeof(ComboBoxItem), new FrameworkPropertyMetadata(typeof(ComboBoxItem))); _dType = DependencyObjectType.FromSystemTypeInternal(typeof(ComboBoxItem)); } #endregion #region Public Properties ////// The key needed set a read-only property. /// private static readonly DependencyPropertyKey IsHighlightedPropertyKey = DependencyProperty.RegisterReadOnly("IsHighlighted", typeof(bool), typeof(ComboBoxItem), new FrameworkPropertyMetadata(BooleanBoxes.FalseBox)); ////// DependencyProperty for the IsHighlighted property /// public static readonly DependencyProperty IsHighlightedProperty = IsHighlightedPropertyKey.DependencyProperty; ////// Indicates if the item is highlighted or not. Styles that want to /// show a highlight for selection should trigger off of this value. /// ///public bool IsHighlighted { get { return (bool)GetValue(IsHighlightedProperty); } protected set { SetValue(IsHighlightedPropertyKey, BooleanBoxes.Box(value)); } } #endregion //-------------------------------------------------------------------- // // Protected Methods // //------------------------------------------------------------------- #region Protected Methods /// /// This is the method that responds to the MouseButtonEvent event. /// /// Event arguments protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e) { e.Handled = true; ComboBox parent = ParentComboBox; if (parent != null) { parent.NotifyComboBoxItemMouseDown(this); } base.OnMouseLeftButtonDown(e); } ////// /// /// protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e) { e.Handled = true; ComboBox parent = ParentComboBox; if (parent != null) { parent.NotifyComboBoxItemMouseUp(this); } base.OnMouseLeftButtonUp(e); } ////// /// /// protected override void OnMouseEnter(MouseEventArgs e) { e.Handled = true; ComboBox parent = ParentComboBox; if (parent != null) { parent.NotifyComboBoxItemEnter(this); } base.OnMouseEnter(e); } ////// Called when Content property has been changed. /// /// /// protected override void OnContentChanged(object oldContent, object newContent) { base.OnContentChanged(oldContent, newContent); // If this is selected, we need to update ParentComboBox.Text // Scenario: //// // In this case ComboBox will try to update Text property as soon as it get // SelectionChanged event. However, at that time ComboBoxItem.Content is not // parse yet. So, Content is null. This causes ComboBox.Text to be "". // ComboBox parent; if (IsSelected && (null != (parent = ParentComboBox))) { parent.SelectedItemUpdated(); } // When the content of the combobox item is a UIElement, // combobox will create a visual clone of the item which needs // to update even when the combobox is closed SetFlags(newContent is UIElement, VisualFlags.IsLayoutIslandRoot); } ///item1 //Item2 //item3 ///// Called when this element gets focus. /// /// protected override void OnGotKeyboardFocus(KeyboardFocusChangedEventArgs e) { e.Handled = true; ComboBox parent = ParentComboBox; if (parent != null) { parent.NotifyComboBoxItemEnter(this); } base.OnGotKeyboardFocus(e); } #endregion //-------------------------------------------------------------------- // // Implementation // //-------------------------------------------------------------------- #region Implementation private ComboBox ParentComboBox { get { return ParentSelector as ComboBox; } } internal void SetIsHighlighted(bool isHighlighted) { IsHighlighted = isHighlighted; } #endregion #region DTypeThemeStyleKey // Returns the DependencyObjectType for the registered ThemeStyleKey's default // value. Controls will override this method to return approriate types. internal override DependencyObjectType DTypeThemeStyleKey { get { return _dType; } } private static DependencyObjectType _dType; #endregion DTypeThemeStyleKey } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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