public CaretAdorner(TextBox adornedElement)
: base(adornedElement)
{
var fontRect = adornedElement.GetRectFromCharacterIndex(0);
this.caret = new Rectangle {
Width = 1,
Height = fontRect.Height,
Fill = Brushes.Black,
RenderTransform = new TranslateTransform(fontRect.Left, fontRect.Top),
Opacity = 0,
SnapsToDevicePixels = true
};
adornedElement.SizeChanged += OnSizeChanged;
adornedElement.SelectionChanged += OnSelectionChanged;
adornedElement.PreviewMouseDown += OnPreviewMouseDown;
adornedElement.GotKeyboardFocus += OnGotFocus;
adornedElement.LostKeyboardFocus += OnLostFocus;
this.children = new VisualCollection(this);
this.children.Add(this.caret);
double transitionTime = SystemInformation.CaretBlinkTime;
TimeSpan fadeTime = TimeSpan.FromMilliseconds(transitionTime * (1d / 3d));
TimeSpan holdTime = TimeSpan.FromMilliseconds(transitionTime * (2d / 3d));
var storyboard = new Storyboard {
RepeatBehavior = RepeatBehavior.Forever
};
var fade = new DoubleAnimationUsingKeyFrames {
KeyFrames =
{
new EasingDoubleKeyFrame(0, KeyTime.FromTimeSpan(fadeTime)),
new DiscreteDoubleKeyFrame(0, KeyTime.FromTimeSpan(fadeTime + holdTime)),
new EasingDoubleKeyFrame(1, KeyTime.FromTimeSpan(fadeTime + holdTime + fadeTime)),
new DiscreteDoubleKeyFrame(1, KeyTime.FromTimeSpan(fadeTime + holdTime + fadeTime + holdTime))
},
Duration = new Duration(TimeSpan.FromMilliseconds(transitionTime * 2))
};
Storyboard.SetTargetProperty(fade, new PropertyPath("Opacity"));
fade.Freeze();
storyboard.Children.Add(fade);
this.blinkStoryboard = storyboard;
}
///for System.Windows.Controls.TextBox
public static System.Windows.Point GetCaretPont(System.Windows.Controls.TextBox textBox)
{
return(textBox.GetRectFromCharacterIndex(textBox.SelectionStart).Location);
}
