wpf 使用箭头键导航列表框项
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Navigate listboxitems using arrow Keys
提问by Selva
My usercontrol has Listbox with Images as ListboxItems, here i'm facing an issue when i navigate listbox items (Images) using "Arrow Keys",i could'n navigate the items that is present in Next row, say for example ,List box contains rows of images*("I have used WrapPanel")*, if i navigate an images using Right arrow keyi cant able to move to next row,
我的用户控件具有带有图像的列表框作为列表框项目，这里我在使用“箭头键”导航列表框项目（图像）时遇到问题，我无法导航下一行中存在的项目，例如，列表框包含图像行* （“我使用过 WrapPanel”）*，如果我使用右箭头键导航图像，则无法移动到下一行，
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="KeyboardNavigation.DirectionalNavigation" Value="Cycle" />
<Setter Property="IsTabStop" Value="True" />
</Style>
</ListBox.ItemContainerStyle>
回答by josh2112
Based on this answerwhich almost worked, but not quite.
Put a KeyDownevent on your ListBox and use its ItemsCollectionto select the next or previous element when you see a Right or Left keypress.
KeyDown在 ListBox 上放置一个事件，并ItemsCollection在您看到向右或向左按键时使用它来选择下一个或上一个元素。
That moves the selection, but not the keyboard focus (dotted line), so you must also call MoveFocuson the element that has Keyboard focus.
这会移动选择，但不会移动键盘焦点（虚线），因此您还必须调用MoveFocus具有键盘焦点的元素。
private void ListBox_KeyDown( object sender, KeyEventArgs e )
{
var list = sender as ListBox;
switch( e.Key )
{
case Key.Right:
if( !list.Items.MoveCurrentToNext() ) list.Items.MoveCurrentToLast();
break;
case Key.Left:
if( !list.Items.MoveCurrentToPrevious() ) list.Items.MoveCurrentToFirst();
break;
}
e.Handled = true;
if( list.SelectedItem != null )
{
(Keyboard.FocusedElement as UIElement).MoveFocus( new TraversalRequest( FocusNavigationDirection.Next ) );
}
}
Finally, make sure you have IsSynchronizedWithCurrentItem="True"on your ListBox.
最后，确保你有IsSynchronizedWithCurrentItem="True"你的 ListBox。
This will give you the wrap-around behaviour that you want.
这将为您提供所需的环绕行为。
