/// <summary>
/// Changes a part of the current document line.
/// </summary>
/// <param name="startOffset">Start offset of the region to change</param>
/// <param name="endOffset">End offset of the region to change</param>
/// <param name="action">Action that changes an individual <see cref="VisualLineElement"/>.</param>
protected void ChangeLinePart(int startOffset, int endOffset, Action <VisualLineElement> action)
{
if (startOffset < currentDocumentLineStartOffset || startOffset > currentDocumentLineEndOffset)
{
/* Az Add Start */
return;
/* Az Add End */
//throw new ArgumentOutOfRangeException("startOffset", startOffset, "Value must be between " + currentDocumentLineStartOffset + " and " + currentDocumentLineEndOffset);
}
if (endOffset < startOffset || endOffset > currentDocumentLineEndOffset)
{
/* Az Add Start */
return;
/* Az Add End */
//throw new ArgumentOutOfRangeException("endOffset", endOffset, "Value must be between " + startOffset + " and " + currentDocumentLineEndOffset);
}
VisualLine vl = this.CurrentContext.VisualLine;
int visualStart = vl.GetVisualColumn(startOffset - firstLineStart);
int visualEnd = vl.GetVisualColumn(endOffset - firstLineStart);
if (visualStart < visualEnd)
{
ChangeVisualElements(visualStart, visualEnd, action);
}
}
/// <summary>
/// Changes a part of the current document line.
/// </summary>
/// <param name="startOffset">Start offset of the region to change</param>
/// <param name="endOffset">End offset of the region to change</param>
/// <param name="action">Action that changes an individual <see cref="VisualLineElement"/>.</param>
protected void ChangeLinePart(int startOffset, int endOffset, IList <VisualLineElement> elements, DocumentContext context, Action <VisualLineElement> action)
{
if (startOffset < context.CurrentDocumentLineStartOffset || startOffset > context.CurrentDocumentLineEndOffset)
{
throw new ArgumentOutOfRangeException("startOffset", startOffset, "Value must be between " + context.CurrentDocumentLineStartOffset + " and " + context.CurrentDocumentLineEndOffset);
}
if (endOffset < startOffset || endOffset > context.CurrentDocumentLineEndOffset)
{
throw new ArgumentOutOfRangeException("endOffset", endOffset, "Value must be between " + startOffset + " and " + context.CurrentDocumentLineEndOffset);
}
VisualLine vl = context.CurrentContext.VisualLine;
int visualStart = vl.GetVisualColumn(startOffset - context.FirstLineStart);
int visualEnd = vl.GetVisualColumn(endOffset - context.FirstLineStart);
if (visualStart < visualEnd)
{
ChangeVisualElements(visualStart, visualEnd, elements, action);
}
}
/// <summary>
/// Validates the visual column of the caret using the specified visual line.
/// The visual line must contain the caret offset.
/// </summary>
void RevalidateVisualColumn(VisualLine visualLine)
{
if (visualLine == null)
throw new ArgumentNullException("visualLine");
// mark column as validated
visualColumnValid = true;
int caretOffset = textView.Document.GetOffset(position);
int firstDocumentLineOffset = visualLine.FirstDocumentLine.Offset;
if (position.VisualColumn < 0) {
position.VisualColumn = visualLine.GetVisualColumn(caretOffset - firstDocumentLineOffset);
} else {
int offsetFromVisualColumn = visualLine.GetRelativeOffset(position.VisualColumn);
offsetFromVisualColumn += firstDocumentLineOffset;
if (offsetFromVisualColumn != caretOffset) {
position.VisualColumn = visualLine.GetVisualColumn(caretOffset - firstDocumentLineOffset);
} else {
if (position.VisualColumn > visualLine.VisualLength) {
position.VisualColumn = visualLine.VisualLength;
}
}
}
// search possible caret positions
int newVisualColumnForwards = visualLine.GetNextCaretPosition(position.VisualColumn - 1, LogicalDirection.Forward, CaretPositioningMode.Normal);
// If position.VisualColumn was valid, we're done with validation.
if (newVisualColumnForwards != position.VisualColumn) {
// also search backwards so that we can pick the better match
int newVisualColumnBackwards = visualLine.GetNextCaretPosition(position.VisualColumn + 1, LogicalDirection.Backward, CaretPositioningMode.Normal);
if (newVisualColumnForwards < 0 && newVisualColumnBackwards < 0)
throw ThrowUtil.NoValidCaretPosition();
// determine offsets for new visual column positions
int newOffsetForwards;
if (newVisualColumnForwards >= 0)
newOffsetForwards = visualLine.GetRelativeOffset(newVisualColumnForwards) + firstDocumentLineOffset;
else
newOffsetForwards = -1;
int newOffsetBackwards;
if (newVisualColumnBackwards >= 0)
newOffsetBackwards = visualLine.GetRelativeOffset(newVisualColumnBackwards) + firstDocumentLineOffset;
else
newOffsetBackwards = -1;
int newVisualColumn, newOffset;
// if there's only one valid position, use it
if (newVisualColumnForwards < 0) {
newVisualColumn = newVisualColumnBackwards;
newOffset = newOffsetBackwards;
} else if (newVisualColumnBackwards < 0) {
newVisualColumn = newVisualColumnForwards;
newOffset = newOffsetForwards;
} else {
// two valid positions: find the better match
if (Math.Abs(newOffsetBackwards - caretOffset) < Math.Abs(newOffsetForwards - caretOffset)) {
// backwards is better
newVisualColumn = newVisualColumnBackwards;
newOffset = newOffsetBackwards;
} else {
// forwards is better
newVisualColumn = newVisualColumnForwards;
newOffset = newOffsetForwards;
}
}
this.Position = new TextViewPosition(textView.Document.GetLocation(newOffset), newVisualColumn);
}
}
/// <summary>
/// Validates the visual column of the caret using the specified visual line.
/// The visual line must contain the caret offset.
/// </summary>
void RevalidateVisualColumn(VisualLine visualLine)
{
if (visualLine == null)
throw new ArgumentNullException("visualLine");
// mark column as validated
visualColumnValid = true;
int caretOffset = textView.Document.GetOffset(position);
int firstDocumentLineOffset = visualLine.FirstDocumentLine.Offset;
if (position.VisualColumn < 0) {
position.VisualColumn = visualLine.GetVisualColumn(caretOffset - firstDocumentLineOffset);
} else {
int offsetFromVisualColumn = visualLine.GetRelativeOffset(position.VisualColumn);
offsetFromVisualColumn += firstDocumentLineOffset;
if (offsetFromVisualColumn != caretOffset) {
position.VisualColumn = visualLine.GetVisualColumn(caretOffset - firstDocumentLineOffset);
} else {
if (position.VisualColumn > visualLine.VisualLength) {
position.VisualColumn = visualLine.VisualLength;
}
}
}
// search possible caret position (first try forwards)
int newVisualColumn = visualLine.GetNextCaretPosition(position.VisualColumn - 1, LogicalDirection.Forward, CaretPositioningMode.Normal);
if (newVisualColumn < 0) {
// then try backwards
newVisualColumn = visualLine.GetNextCaretPosition(position.VisualColumn + 1, LogicalDirection.Backward, CaretPositioningMode.Normal);
}
if (newVisualColumn < 0)
throw ThrowUtil.NoValidCaretPosition();
if (newVisualColumn != position.VisualColumn) {
int newOffset = visualLine.GetRelativeOffset(newVisualColumn) + firstDocumentLineOffset;
this.Position = new TextViewPosition(textView.Document.GetLocation(newOffset), newVisualColumn);
}
}
