It's a BUG in WPF。我通过创造自己的风格来实现这一点TextBox
Caret
.
XAML: Style for TextBox
<Style TargetType="{x:Type TextBox}" x:Key="CaretStyle" >
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Canvas>
<TextBox x:Name="Box" CaretBrush="Transparent" Width="{Binding RelativeSource={RelativeSource AncestorType=TextBox},Path=ActualWidth,Mode=OneWay}"
Height="{Binding RelativeSource={RelativeSource AncestorType=TextBox},Path=ActualHeight,Mode=OneWay}"/>
<Border x:Name="Caret"
Visibility="Collapsed"
Canvas.Left="0" Canvas.Top="0" Margin="0" Padding="0"
Width="1" Height="16" Background="Black">
<Border.Triggers>
<EventTrigger RoutedEvent="Border.Loaded">
<BeginStoryboard>
<Storyboard x:Name="CaretStoryBoard"
RepeatBehavior="Forever">
<ColorAnimationUsingKeyFrames
Storyboard.TargetProperty="Background.Color"
Duration="0:0:0:1"
FillBehavior="HoldEnd">
<ColorAnimationUsingKeyFrames.KeyFrames >
<DiscreteColorKeyFrame KeyTime="0:0:0.750"
Value="Transparent" />
<DiscreteColorKeyFrame KeyTime="0:0:0.000"
Value="Black"/>
</ColorAnimationUsingKeyFrames.KeyFrames>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Border.Triggers>
</Border>
</Canvas>
</ControlTemplate>
</Setter.Value>
</Setter>
<EventSetter Event="SelectionChanged" Handler="CustomTextBox_SelectionChanged"/>
<EventSetter Event="GotFocus" Handler="CustomTextBox_GotFocus" />
<EventSetter Event="LostFocus" Handler="CustomTextBox_LostFocus" />
</Style>
EVENTS: For Caret Position
void CustomTextBox_LostFocus(object sender, RoutedEventArgs e)
{
var Caret = FindChild<Border>(sender as DependencyObject, "Caret");
Caret.Visibility = Visibility.Collapsed;
}
void CustomTextBox_GotFocus(object sender, RoutedEventArgs e)
{
var Caret = FindChild<Border>(sender as DependencyObject, "Caret");
Caret.Visibility = Visibility.Visible;
}
void CustomTextBox_SelectionChanged(object sender, RoutedEventArgs e)
{
var CustomTextBox = FindChild<TextBox>(sender as DependencyObject, "Box");
var caretLocation = CustomTextBox.GetRectFromCharacterIndex(CustomTextBox.CaretIndex).Location;
var Caret = FindChild<Border>(sender as DependencyObject, "Caret");
if (!double.IsInfinity(caretLocation.X))
{
Canvas.SetLeft(Caret, caretLocation.X);
}
if (!double.IsInfinity(caretLocation.Y))
{
Canvas.SetTop(Caret, caretLocation.Y);
}
}
辅助方法: To Get Visual Child
public static T FindChild<T>(DependencyObject parent, string childName)
where T : DependencyObject
{
// Confirm parent and childName are valid.
if (parent == null) return null;
T foundChild = null;
int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < childrenCount; i++)
{
var child = VisualTreeHelper.GetChild(parent, i);
// If the child is not of the request child type child
T childType = child as T;
if (childType == null)
{
// recursively drill down the tree
foundChild = FindChild<T>(child, childName);
// If the child is found, break so we do not overwrite the found child.
if (foundChild != null) break;
}
else if (!string.IsNullOrEmpty(childName))
{
var frameworkElement = child as FrameworkElement;
// If the child's name is set for search
if (frameworkElement != null && frameworkElement.Name == childName)
{
// if the child's name is of the request name
foundChild = (T)child;
break;
}
}
else
{
// child element found.
foundChild = (T)child;
break;
}
}
return foundChild;
}
只需添加上面即可Style
/metods
在你的代码中并设置Style
for
TextBoxes
无论您想要什么,都可以看到结果。正如我所创造的
这是我自己没有实际测量的Caret symbol
,您可能会看到一定比例的浅色阴影。请调整
根据需要的外观和感觉。