/// <summary>
/// This determines if the image which is used to represent the caret is stale and needs
/// to be recreated.
/// </summary>
private bool IsAdornmentStale(CaretData caretData)
{
// Size is represented in floating point so strict equality comparison will almost
// always return false. Use a simple epsilon to test the difference
if (caretData.Color != TryCalculateCaretColor() ||
caretData.CaretDisplay != _caretDisplay ||
caretData.CaretOpacity != _caretOpacity)
{
return(true);
}
var tuple = CalculateCaretRectAndDisplayOffset();
var epsilon = 0.001;
var size = tuple.Item1.Size;
if (Math.Abs(size.Height - caretData.Size.Height) > epsilon ||
Math.Abs(size.Width - caretData.Size.Width) > epsilon)
{
return(true);
}
var caretCharacter = tuple.Item3;
if (caretData.CaretCharacter != caretCharacter)
{
return(true);
}
return(false);
}
public UITextField(UIManager manager, BitmapFont font) : base(manager, font)
{
Caret = new CaretData();
ValidateInput = DefaultValidateInput;
_placeholderSegment = new TextSegment(font);
UsePlaceholderColorFormatting = true;
PlaceholderColor = Color.Gray * 0.8f;
PlaceholderSelectColor = Color.LightGoldenrodYellow * 0.9f;
PlaceholderColorTransitionSpeed = 0.125f;
_obscureChar = DefaultObscureChar;
_charLimit = 1024;
CharBlacklist = new ObservableHashSet <char>();
CharBlacklist.OnAdd += (s, value) => Remove(value);
IsKeyboardEventTrigger = true;
IsMouseEventTrigger = true;
BuildQuadTree = true;
IsSelectable = true;
SelectionColor = Color.OrangeRed;
SelectionOutlineThickness = 2f;
OnKeyRepeat += UITextArea_OnKeyRepeat;
OnKeyPress += UITextArea_OnKeyPress;
OnTextInput += UITextArea_OnTextInput;
}
private void MoveCaretElementToCaret(CaretData caretData)
{
var point = GetRealCaretVisualPoint();
Canvas.SetLeft(caretData.Element, point.X);
Canvas.SetTop(caretData.Element, point.Y + caretData.YDisplayOffset);
}
private void MoveCaretElementToCaret(CaretData caretData)
{
var point = GetRealCaretVisualPoint();
if (caretData.CaretDisplay == CaretDisplay.Select)
{
point = new Point(SnapToWholeDevicePixels(point.X, ensurePositive: false), point.Y);
}
Canvas.SetLeft(caretData.Element, point.X);
Canvas.SetTop(caretData.Element, point.Y + caretData.YDisplayOffset);
}
private void MoveCaretElementToCaret(VirtualSnapshotPoint caretPoint, CaretData caretData)
{
var point = GetRealCaretVisualPoint(caretPoint);
if (point == s_invalidPoint)
{
caretData.Element.Visibility = Visibility.Hidden;
}
else
{
caretData.Element.Visibility = Visibility.Visible;
if (caretData.CaretDisplay == CaretDisplay.Select)
{
point = new Point(SnapToWholeDevicePixels(point.X, ensurePositive: false), point.Y);
}
Canvas.SetLeft(caretData.Element, point.X);
Canvas.SetTop(caretData.Element, point.Y + caretData.YDisplayOffset);
}
}
/// <summary>
/// This determines if the image which is used to represent the caret is stale and needs
/// to be recreated.
/// </summary>
private bool IsAdornmentStale(CaretData caretData)
{
// Size is represented in floating point so strict equality comparison will almost
// always return false. Use a simple epsilon to test the difference
if (caretData.Color != TryCalculateCaretColor() ||
caretData.CaretDisplay != _caretDisplay ||
caretData.CaretOpacity != _caretOpacity)
{
return true;
}
var epsilon = 0.001;
var size = CalculateCaretRectAndDisplayOffset().Item1.Size;
if (Math.Abs(size.Height - caretData.Size.Height) > epsilon ||
Math.Abs(size.Width - caretData.Size.Width) > epsilon)
{
return true;
}
return false;
}
private void MoveCaretImageToCaret(CaretData caretData)
{
var point = GetRealCaretVisualPoint();
Canvas.SetLeft(caretData.Image, point.X);
Canvas.SetTop(caretData.Image, point.Y + caretData.YDisplayOffset);
}
private void CreateCaretData()
{
var color = TryCalculateCaretColor();
var brush = new SolidColorBrush(color ?? Colors.Black);
brush.Freeze();
var pen = new Pen(brush, 1.0);
var rect = new Rect(GetRealCaretVisualPoint(), GetOptimalCaretSize());
var geometry = new RectangleGeometry(rect);
var drawing = new GeometryDrawing(brush, pen, geometry);
drawing.Freeze();
var drawingImage = new DrawingImage(drawing);
drawingImage.Freeze();
var image = new Image();
image.Opacity = _caretOpacity;
image.Source = drawingImage;
var point = _view.Caret.Position.BufferPosition;
var data = new CaretData(image, color, point);
_caretData = data;
_layer.AddAdornment(
AdornmentPositioningBehavior.TextRelative,
new SnapshotSpan(point, 0),
_tag,
image,
(x, y) => { _caretData = null; });
MoveCaretImageToCaret();
}
