static Rect GetCharacterBounds(this TextView textView, TextViewPosition pos, HwndSource source)
{
VisualLine vl = textView.GetVisualLine(pos.Line);
if (vl == null)
{
return(EMPTY_RECT);
}
// this may happen during layout changes in AvalonDock, so we just return an empty rectangle
// in those cases. It should be refreshed immediately.
if (source.RootVisual == null || !source.RootVisual.IsAncestorOf(textView))
{
return(EMPTY_RECT);
}
TextLine line = vl.GetTextLine(pos.VisualColumn);
Rect displayRect;
// calculate the display rect for the current character
if (pos.VisualColumn < vl.VisualLengthWithEndOfLineMarker)
{
displayRect = line.GetTextBounds(pos.VisualColumn, 1).First().Rectangle;
displayRect.Offset(0, vl.GetTextLineVisualYPosition(line, VisualYPosition.LineTop));
}
else
{
// if we are in virtual space, we just use one wide-space as character width
displayRect = new Rect(vl.GetVisualPosition(pos.VisualColumn, VisualYPosition.TextTop),
new Size(textView.WideSpaceWidth, textView.DefaultLineHeight));
}
// adjust to current scrolling
displayRect.Offset(-textView.ScrollOffset);
return(textView
.TransformToAncestor(source.RootVisual).TransformBounds(displayRect) // rect on root visual
.TransformToDevice(source.RootVisual)); // rect on HWND
}
static Rect GetCharacterBounds(this TextView textView, TextViewPosition pos, HwndSource source)
{
VisualLine vl = textView.GetVisualLine(pos.Line);
if (vl == null)
{
return(EMPTY_RECT);
}
TextLine line = vl.GetTextLine(pos.VisualColumn);
double offset = vl.GetTextLineVisualYPosition(line, VisualYPosition.LineTop) - textView.ScrollOffset.Y;
Rect r = line.GetTextBounds(pos.VisualColumn, 1).First().Rectangle;
r.Offset(-textView.ScrollOffset.X, offset);
// this may happen during layout changes in AvalonDock, so we just return an empty rectangle
// in those cases. It should be refreshed immediately.
if (!source.RootVisual.IsAncestorOf(textView))
{
return(EMPTY_RECT);
}
Point pointOnRootVisual = textView.TransformToAncestor(source.RootVisual).Transform(r.Location);
Point pointOnHwnd = pointOnRootVisual.TransformToDevice(source.RootVisual);
r.Location = pointOnHwnd;
return(r);
}
internal static TextViewPosition GetNewCaretPosition(TextView textView, TextViewPosition caretPosition, CaretMovementType direction, bool enableVirtualSpace, ref double desiredXPos)
{
switch (direction)
{
case CaretMovementType.None:
return(caretPosition);
case CaretMovementType.DocumentStart:
desiredXPos = double.NaN;
return(new TextViewPosition(0, 0));
case CaretMovementType.DocumentEnd:
desiredXPos = double.NaN;
return(new TextViewPosition(textView.Document.GetLocation(textView.Document.TextLength)));
}
DocumentLine caretLine = textView.Document.GetLineByNumber(caretPosition.Line);
VisualLine visualLine = textView.GetOrConstructVisualLine(caretLine);
TextLine textLine = visualLine.GetTextLine(caretPosition.VisualColumn, caretPosition.IsAtEndOfLine);
switch (direction)
{
case CaretMovementType.CharLeft:
desiredXPos = double.NaN;
return(GetPrevCaretPosition(textView, caretPosition, visualLine, CaretPositioningMode.Normal, enableVirtualSpace));
case CaretMovementType.Backspace:
desiredXPos = double.NaN;
return(GetPrevCaretPosition(textView, caretPosition, visualLine, CaretPositioningMode.EveryCodepoint, enableVirtualSpace));
case CaretMovementType.CharRight:
desiredXPos = double.NaN;
return(GetNextCaretPosition(textView, caretPosition, visualLine, CaretPositioningMode.Normal, enableVirtualSpace));
case CaretMovementType.WordLeft:
desiredXPos = double.NaN;
return(GetPrevCaretPosition(textView, caretPosition, visualLine, CaretPositioningMode.WordStart, enableVirtualSpace));
case CaretMovementType.WordRight:
desiredXPos = double.NaN;
return(GetNextCaretPosition(textView, caretPosition, visualLine, CaretPositioningMode.WordStart, enableVirtualSpace));
case CaretMovementType.LineUp:
case CaretMovementType.LineDown:
case CaretMovementType.PageUp:
case CaretMovementType.PageDown:
return(GetUpDownCaretPosition(textView, caretPosition, direction, visualLine, textLine, enableVirtualSpace, ref desiredXPos));
case CaretMovementType.LineStart:
desiredXPos = double.NaN;
return(GetStartOfLineCaretPosition(caretPosition.VisualColumn, visualLine, textLine, enableVirtualSpace));
case CaretMovementType.LineEnd:
desiredXPos = double.NaN;
return(GetEndOfLineCaretPosition(visualLine, textLine));
default:
throw new NotSupportedException(direction.ToString());
}
}
static double GetXPos(TextArea textArea, TextViewPosition pos)
{
DocumentLine documentLine = textArea.Document.GetLineByNumber(pos.Line);
VisualLine visualLine = textArea.TextView.GetOrConstructVisualLine(documentLine);
int vc = visualLine.ValidateVisualColumn(pos, true);
TextLine textLine = visualLine.GetTextLine(vc);
return(visualLine.GetTextLineVisualXPosition(textLine, vc));
}
static void MoveCaret(TextArea textArea, CaretMovementType direction)
{
DocumentLine caretLine = textArea.Document.GetLineByNumber(textArea.Caret.Line);
VisualLine visualLine = textArea.TextView.GetOrConstructVisualLine(caretLine);
TextViewPosition caretPosition = textArea.Caret.Position;
TextLine textLine = visualLine.GetTextLine(caretPosition.VisualColumn);
switch (direction)
{
case CaretMovementType.CharLeft:
MoveCaretLeft(textArea, caretPosition, visualLine, CaretPositioningMode.Normal);
break;
case CaretMovementType.CharRight:
MoveCaretRight(textArea, caretPosition, visualLine, CaretPositioningMode.Normal);
break;
case CaretMovementType.WordLeft:
MoveCaretLeft(textArea, caretPosition, visualLine, CaretPositioningMode.WordStart);
break;
case CaretMovementType.WordRight:
MoveCaretRight(textArea, caretPosition, visualLine, CaretPositioningMode.WordStart);
break;
case CaretMovementType.LineUp:
case CaretMovementType.LineDown:
case CaretMovementType.PageUp:
case CaretMovementType.PageDown:
MoveCaretUpDown(textArea, direction, visualLine, textLine, caretPosition.VisualColumn);
break;
case CaretMovementType.DocumentStart:
SetCaretPosition(textArea, 0, 0);
break;
case CaretMovementType.DocumentEnd:
SetCaretPosition(textArea, -1, textArea.Document.TextLength);
break;
case CaretMovementType.LineStart:
MoveCaretToStartOfLine(textArea, visualLine);
break;
case CaretMovementType.LineEnd:
MoveCaretToEndOfLine(textArea, visualLine);
break;
default:
throw new NotSupportedException(direction.ToString());
}
}
int GetTextLineIndexFromOffset(List <TextLine> textLines, int offset)
{
int lineNumber = TextView.Document.GetLineByOffset(offset).LineNumber;
VisualLine vl = TextView.GetVisualLine(lineNumber);
if (vl != null)
{
int relOffset = offset - vl.FirstDocumentLine.Offset;
TextLine line = vl.GetTextLine(vl.GetVisualColumn(relOffset));
return(textLines.IndexOf(line));
}
return(-1);
}
Rect CalcCaretRectangle(VisualLine visualLine)
{
if (!visualColumnValid)
{
RevalidateVisualColumn(visualLine);
}
TextLine textLine = visualLine.GetTextLine(position.VisualColumn);
double xPos = visualLine.GetTextLineVisualXPosition(textLine, position.VisualColumn);
double lineTop = visualLine.GetTextLineVisualYPosition(textLine, VisualYPosition.TextTop);
double lineBottom = visualLine.GetTextLineVisualYPosition(textLine, VisualYPosition.TextBottom);
return(new Rect(xPos, lineTop, SystemParameters.CaretWidth, lineBottom - lineTop));
}
Rect CalcCaretOverstrikeRectangle(VisualLine visualLine)
{
if (!visualColumnValid)
{
RevalidateVisualColumn(visualLine);
}
int currentPos = position.VisualColumn;
// The text being overwritten in overstrike mode is everything up to the next normal caret stop
int nextPos = visualLine.GetNextCaretPosition(currentPos, LogicalDirection.Forward, CaretPositioningMode.Normal, true);
TextLine textLine = visualLine.GetTextLine(currentPos);
Rect r;
if (currentPos < visualLine.VisualLength)
{
// If the caret is within the text, use GetTextBounds() for the text being overwritten.
// This is necessary to ensure the rectangle is calculated correctly in bidirectional text.
var textBounds = textLine.GetTextBounds(currentPos, nextPos - currentPos)[0];
r = textBounds.Rectangle;
r.Y += visualLine.GetTextLineVisualYPosition(textLine, VisualYPosition.LineTop);
}
else
{
// If the caret is at the end of the line (or in virtual space),
// use the visual X position of currentPos and nextPos (one or more of which will be in virtual space)
double xPos = visualLine.GetTextLineVisualXPosition(textLine, currentPos);
double xPos2 = visualLine.GetTextLineVisualXPosition(textLine, nextPos);
double lineTop = visualLine.GetTextLineVisualYPosition(textLine, VisualYPosition.TextTop);
double lineBottom = visualLine.GetTextLineVisualYPosition(textLine, VisualYPosition.TextBottom);
r = new Rect(xPos, lineTop, xPos2 - xPos, lineBottom - lineTop);
}
// If the caret is too small (e.g. in front of zero-width character), ensure it's still visible
if (r.Width < SystemParameters.CaretWidth)
{
r.Width = SystemParameters.CaretWidth;
}
return(r);
}