/// <summary>
/// Gets the distance to the left border of the text area of the specified visual column.
/// The visual column must belong to the specified text line.
/// </summary>
public double GetTextLineVisualXPosition(TextLine textLine, int visualColumn)
{
if (textLine == null)
throw new ArgumentNullException("textLine");
double xPos = textLine.GetDistanceFromCharacterHit(
new CharacterHit(Math.Min(visualColumn, VisualLengthWithEndOfLineMarker), 0));
if (visualColumn > VisualLengthWithEndOfLineMarker) {
xPos += (visualColumn - VisualLengthWithEndOfLineMarker) * textView.WideSpaceWidth;
}
return xPos;
}
private void FindSelectedArea(int idx, int txtLen, int txtOffset, double x, TextLine line, ref double start, ref double end)
{
int first = Math.Max(txtOffset, this.SelectionStart - idx);
int last = Math.Min(txtLen - 1 + txtOffset, this.SelectionEnd - idx);
if (last >= first)
{
start = Math.Min(start, line.GetDistanceFromCharacterHit(new CharacterHit(first, 0)) + x);
end = Math.Max(end, line.GetDistanceFromCharacterHit(new CharacterHit(last, 1)) + x);
}
}
static void MoveCaretUpDown(TextArea textArea, CaretMovementType direction, VisualLine visualLine, TextLine textLine, int caretVisualColumn)
{
// moving up/down happens using the desired visual X position
double xPos = textArea.Caret.DesiredXPos;
if (double.IsNaN(xPos))
xPos = textLine.GetDistanceFromCharacterHit(new CharacterHit(caretVisualColumn, 0));
// now find the TextLine+VisualLine where the caret will end up in
VisualLine targetVisualLine = visualLine;
TextLine targetLine;
int textLineIndex = visualLine.TextLines.IndexOf(textLine);
switch (direction) {
case CaretMovementType.LineUp:
{
// Move up: move to the previous TextLine in the same visual line
// or move to the last TextLine of the previous visual line
int prevLineNumber = visualLine.FirstDocumentLine.LineNumber - 1;
if (textLineIndex > 0) {
targetLine = visualLine.TextLines[textLineIndex - 1];
} else if (prevLineNumber >= 1) {
DocumentLine prevLine = textArea.Document.GetLineByNumber(prevLineNumber);
targetVisualLine = textArea.TextView.GetOrConstructVisualLine(prevLine);
targetLine = targetVisualLine.TextLines[targetVisualLine.TextLines.Count - 1];
} else {
targetLine = null;
}
break;
}
case CaretMovementType.LineDown:
{
// Move down: move to the next TextLine in the same visual line
// or move to the first TextLine of the next visual line
int nextLineNumber = visualLine.LastDocumentLine.LineNumber + 1;
if (textLineIndex < visualLine.TextLines.Count - 1) {
targetLine = visualLine.TextLines[textLineIndex + 1];
} else if (nextLineNumber <= textArea.Document.LineCount) {
DocumentLine nextLine = textArea.Document.GetLineByNumber(nextLineNumber);
targetVisualLine = textArea.TextView.GetOrConstructVisualLine(nextLine);
targetLine = targetVisualLine.TextLines[0];
} else {
targetLine = null;
}
break;
}
case CaretMovementType.PageUp:
case CaretMovementType.PageDown:
{
// Page up/down: find the target line using its visual position
double yPos = visualLine.GetTextLineVisualYPosition(textLine, VisualYPosition.LineMiddle);
if (direction == CaretMovementType.PageUp)
yPos -= textArea.TextView.RenderSize.Height;
else
yPos += textArea.TextView.RenderSize.Height;
DocumentLine newLine = textArea.TextView.GetDocumentLineByVisualTop(yPos);
targetVisualLine = textArea.TextView.GetOrConstructVisualLine(newLine);
targetLine = targetVisualLine.GetTextLineByVisualYPosition(yPos);
break;
}
default:
throw new NotSupportedException(direction.ToString());
}
if (targetLine != null) {
CharacterHit ch = targetLine.GetCharacterHitFromDistance(xPos);
SetCaretPosition(textArea, targetVisualLine, targetLine, ch, false);
textArea.Caret.DesiredXPos = xPos;
}
}
private List<textView.TextBounds> GetTextBoundsOnLine(TextLine textLine, Double horizontalOffset, Int32 startIndex, Int32 endIndex)
{
var list = new List<textView.TextBounds>();
if (startIndex == endIndex)
{
Double distanceFromCharacterHit = textLine.GetDistanceFromCharacterHit(new CharacterHit(startIndex, 0));
list.Add(new textView.TextBounds((distanceFromCharacterHit + horizontalOffset) + this.HorizontalOffset, this.VerticalOffset, 0, this.Height));
return list;
}
foreach (textFormatting.TextBounds bounds in textLine.GetTextBounds(startIndex, endIndex - startIndex))
{
list.Add(new textView.TextBounds(bounds.Rectangle.Left + horizontalOffset, bounds.Rectangle.Top + this.VerticalOffset, bounds.Rectangle.Width, this.Height));
}
return list;
}