static TextViewPosition GetPrevCaretPosition(TextView textView, TextViewPosition caretPosition, VisualLine visualLine, CaretPositioningMode mode, bool enableVirtualSpace) {
int pos = visualLine.GetNextCaretPosition(caretPosition.VisualColumn, LogicalDirection.Backward, mode, enableVirtualSpace);
if (pos >= 0)
return visualLine.GetTextViewPosition(pos);
var previousDocumentLine = visualLine.FirstDocumentLine.PreviousLine;
if (previousDocumentLine != null) {
var previousLine = textView.GetOrConstructVisualLine(previousDocumentLine);
pos = previousLine.GetNextCaretPosition(previousLine.VisualLength + 1, LogicalDirection.Backward, mode, enableVirtualSpace);
return previousLine.GetTextViewPosition(pos);
}
return new TextViewPosition(0, 0);
}
static TextViewPosition GetPrevCaretPosition(TextView textView, TextViewPosition caretPosition, VisualLine visualLine, CaretPositioningMode mode, bool enableVirtualSpace)
{
int pos = visualLine.GetNextCaretPosition(caretPosition.VisualColumn, LogicalDirection.Backward, mode, enableVirtualSpace);
if (pos >= 0) {
return visualLine.GetTextViewPosition(pos);
} else {
// move to end of previous line
DocumentLine previousDocumentLine = visualLine.FirstDocumentLine.PreviousLine;
if (previousDocumentLine != null) {
VisualLine previousLine = textView.GetOrConstructVisualLine(previousDocumentLine);
pos = previousLine.GetNextCaretPosition(previousLine.VisualLength + 1, LogicalDirection.Backward, mode, enableVirtualSpace);
if (pos < 0)
throw ThrowUtil.NoValidCaretPosition();
return previousLine.GetTextViewPosition(pos);
} else {
// at start of document
Debug.Assert(visualLine.FirstDocumentLine.Offset == 0);
return new TextViewPosition(0, 0);
}
}
}
static TextViewPosition GetEndOfLineCaretPosition(VisualLine visualLine, TextLine textLine)
{
int newVC = visualLine.GetTextLineVisualStartColumn(textLine) + textLine.Length - textLine.TrailingWhitespaceLength;
TextViewPosition pos = visualLine.GetTextViewPosition(newVC);
pos.IsAtEndOfLine = true;
return pos;
}
static TextViewPosition GetNextCaretPosition(TextView textView, TextViewPosition caretPosition, VisualLine visualLine, CaretPositioningMode mode, bool enableVirtualSpace)
{
int pos = visualLine.GetNextCaretPosition(caretPosition.VisualColumn, LogicalDirection.Forward, mode, enableVirtualSpace);
if (pos >= 0) {
return visualLine.GetTextViewPosition(pos);
} else {
// move to start of next line
DocumentLine nextDocumentLine = visualLine.LastDocumentLine.NextLine;
if (nextDocumentLine != null) {
VisualLine nextLine = textView.GetOrConstructVisualLine(nextDocumentLine);
pos = nextLine.GetNextCaretPosition(-1, LogicalDirection.Forward, mode, enableVirtualSpace);
if (pos < 0)
throw ThrowUtil.NoValidCaretPosition();
return nextLine.GetTextViewPosition(pos);
} else {
// at end of document
Debug.Assert(visualLine.LastDocumentLine.Offset + visualLine.LastDocumentLine.TotalLength == textView.Document.TextLength);
return new TextViewPosition(textView.Document.GetLocation(textView.Document.TextLength));
}
}
}
static TextViewPosition GetStartOfLineCaretPosition(int oldVC, VisualLine visualLine, TextLine textLine, bool enableVirtualSpace)
{
int newVC = visualLine.GetTextLineVisualStartColumn(textLine);
if (newVC == 0)
newVC = visualLine.GetNextCaretPosition(newVC - 1, LogicalDirection.Forward, CaretPositioningMode.WordStart, enableVirtualSpace);
if (newVC < 0)
throw ThrowUtil.NoValidCaretPosition();
// when the caret is already at the start of the text, jump to start before whitespace
if (newVC == oldVC)
newVC = 0;
return visualLine.GetTextViewPosition(newVC);
}