我无法在WPF Tab Control上获取附加属性。我已经实现了CodeProject教程中定义的类
http://www.codeproject.com/Articles/349140/WPF-TabControl-focus-behavior-with-invisible-tabs
定义如下。
namespace MyNamespace
{
public static class TabControlBehavior
{
public static readonly DependencyProperty FocusFirstVisibleTabProperty =
DependencyProperty.RegisterAttached("FocusFirstVisibleTab",
typeof(bool),
typeof(TabControlBehavior),
new FrameworkPropertyMetadata(OnFocusFirstVisibleTabPropertyChanged));
/// <summary>Gets the focus first visible tab value of the given element.
/// </summary>
/// <param name="element">The element.</param>
/// <returns></returns>
public static bool GetFocusFirstVisibleTab(TabControl element)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
return (bool)element.GetValue(FocusFirstVisibleTabProperty);
}
/// <summary>Sets the focus first visible tab value of the given element.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="value">if set to <c>true</c> [value].</param>
public static void SetFocusFirstVisibleTab(TabControl element, bool value)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
element.SetValue(FocusFirstVisibleTabProperty, value);
}
/// <summary>Determines whether the value of the dependency property <c>IsFocused</c> has change.
/// </summary>
/// <param name="d">The dependency object.</param>
/// <param name="e">The <see
/// cref="System.Windows.DependencyPropertyChangedEventArgs"/>
/// instance containing the event data.</param>
private static void OnFocusFirstVisibleTabPropertyChanged(
DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var tabControl = d as TabControl;
if (tabControl != null)
{
// Attach or detach the event handlers.
if ((bool)e.NewValue)
{
// Enable the attached behavior.
tabControl.Items.CurrentChanged += new EventHandler(TabControl_Items_CurrentChanged);
var collection = tabControl.Items as INotifyCollectionChanged;
if (collection != null)
{
collection.CollectionChanged +=
new NotifyCollectionChangedEventHandler(TabControl_Items_CollectionChanged);
}
}
else
{
// Disable the attached behavior.
tabControl.Items.CurrentChanged -= new EventHandler(TabControl_Items_CurrentChanged);
var collection = tabControl.Items as INotifyCollectionChanged;
if (collection != null)
{
collection.CollectionChanged -=
new NotifyCollectionChangedEventHandler(TabControl_Items_CollectionChanged);
}
// Detach handlers from the tab items.
foreach (var item in tabControl.Items)
{
TabItem tab = item as TabItem;
if (tab != null)
{
tab.IsVisibleChanged -=
new DependencyPropertyChangedEventHandler(TabItem_IsVisibleChanged);
}
}
}
}
}
/// <summary>Handles the CollectionChanged event of the TabControl.Items collection.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see
/// cref="System.Collections.Specialized.NotifyCollectionChangedEventArgs"/>
/// instance containing the event data.</param>
static void TabControl_Items_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
// Attach event handlers to each tab so that when the Visibility property changes of the selected tab,
// the focus can be shifted to the next (or previous, if not next tab available) tab.
var collection = sender as ItemCollection;
if (collection != null)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
case NotifyCollectionChangedAction.Remove:
case NotifyCollectionChangedAction.Replace:
// Attach event handlers to the Visibility and IsEnabled properties.
if (e.NewItems != null)
{
foreach (var item in e.NewItems)
{
TabItem tab = item as TabItem;
if (tab != null)
{
tab.IsVisibleChanged +=
new DependencyPropertyChangedEventHandler(TabItem_IsVisibleChanged);
}
}
}
// Detach event handlers from old items.
if (e.OldItems != null)
{
foreach (var item in e.OldItems)
{
TabItem tab = item as TabItem;
if (tab != null)
{
tab.IsVisibleChanged -=
new DependencyPropertyChangedEventHandler(TabItem_IsVisibleChanged);
}
}
}
break;
case NotifyCollectionChangedAction.Reset:
// Attach event handlers to the Visibility and IsEnabled properties.
foreach (var item in collection)
{
TabItem tab = item as TabItem;
if (tab != null)
{
tab.IsVisibleChanged +=
new DependencyPropertyChangedEventHandler(TabItem_IsVisibleChanged);
}
}
break;
case NotifyCollectionChangedAction.Move:
default:
break;
}
// Select the first element if necessary.
if (collection.Count > 0 && collection.CurrentItem == null)
{
collection.MoveCurrentToFirst();
}
}
}
/// <summary>Handles the CurrentChanged event of the TabControl.Items collection.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.EventArgs"/>
/// instance containing the event data.</param>
static void TabControl_Items_CurrentChanged(object sender, EventArgs e)
{
var collection = sender as ItemCollection;
if (collection != null)
{
UIElement element = collection.CurrentItem as UIElement;
if (element != null && element.Visibility != Visibility.Visible)
{
element.Dispatcher.BeginInvoke(new Action(() => collection.MoveCurrentToNext()),
System.Windows.Threading.DispatcherPriority.Input);
}
}
}
/// <summary>Handles the IsVisibleChanged event of the tab item.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see
/// cref="System.Windows.DependencyPropertyChangedEventArgs"/>
/// instance containing the event data.</param>
static void TabItem_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
{
TabItem tab = sender as TabItem;
if (tab != null && tab.IsSelected && tab.Visibility != Visibility.Visible)
{
// Move to the next tab item.
TabControl tabControl = tab.Parent as TabControl;
if (tabControl != null)
{
if (!tabControl.Items.MoveCurrentToNext())
{
// Could not move to next, try previous.
tabControl.Items.MoveCurrentToPrevious();
}
}
}
}
}
}
然后我尝试在我的xaml代码中设置附加的依赖项属性，如下所示：
<Window x:Class="MyNamespace.MyApp"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d3="http://research.microsoft.com/DynamicDataDisplay/1.0"
xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
xmlns:local="clr-namespace:MyNamespace">
<Window.Resources>
<ResourceDictionary>
<Style TargetType="{x:Type TabControl}">
<Setter Property="local:TabControlBehavior.FocusFirstVisibleTab" Value="True" />
</Style>
</ResourceDictionary>
</Window.Resources>
</Window>
但是由于以下错误我无法编译
MC4003：无法解析样式属性＆＃39; FocusFirstVisibleTab＆＃39;。验证拥有类型是Style的TargetType，或使用Class.Property语法指定属性。
提前感谢您的帮助。
答案 0 :(得分：0)
通过将MyNamespace重命名为包含我的应用程序的命名空间以外的其他内容来解决问题。