private static void OnMoveUpByParagraph(object sender, ExecutedRoutedEventArgs args)
{
TextEditor This = TextEditor._GetTextEditor(sender);
if (This == null || !This._IsEnabled || !This._IsSourceInScope(args.Source))
{
return;
}
TextEditorTyping._FlushPendingInputItems(This);
using (This.Selection.DeclareChangeBlock())
{
// Forget previously suggested horizontal position
TextEditorSelection._ClearSuggestedX(This);
// Discard typing undo unit merging
TextEditorTyping._BreakTypingSequence(This);
// Clear springload formatting
ClearSpringloadFormatting(This);
// Move/extend selection in requested direction
if (!This.Selection.IsEmpty)
{
// If the selection is non-empty and ends on a word boundary, collapse it to that boundary.
// Collapsing must happen to selection START - not to its moving position.
// It is Word behavior for setting a cratet on moving down from nonempty selection.
ITextPointer position = TextEditorSelection.GetStartInner(This);
This.Selection.SetCaretToPosition(position, position.LogicalDirection, /*allowStopAtLineEnd:*/false, /*allowStopNearSpace:*/false);
}
ITextPointer movingPointer = This.Selection.MovingPosition.CreatePointer();
ITextRange paragraphRange = new TextRange(movingPointer, movingPointer);
paragraphRange.SelectParagraph(movingPointer);
if (This.Selection.Start.CompareTo(paragraphRange.Start) > 0)
{
// We are in the middle of a paragraph. Move to its start
This.Selection.SetCaretToPosition(paragraphRange.Start, LogicalDirection.Backward, /*allowStopAtLineEnd:*/false, /*allowStopNearSpace:*/false);
}
else
{
movingPointer.MoveToPosition(paragraphRange.Start);
if (movingPointer.MoveToNextInsertionPosition(LogicalDirection.Backward))
{
// Previous paragraph found. Set selection to its start
paragraphRange.SelectParagraph(movingPointer);
This.Selection.SetCaretToPosition(paragraphRange.Start, LogicalDirection.Backward, /*allowStopAtLineEnd:*/false, /*allowStopNearSpace:*/false);
}
}
}
}
/// <summary>
/// Re-positions the given position by an integral number of text units, but it does
/// not guarantee that position is snapped to TextUnit boundary.
/// This method assumes that input position is already snapped to appropriate TextUnit boundary.
/// </summary>
/// <param name="position">The position to move</param>
/// <param name="unit">Text units to step by</param>
/// <param name="count">Number of units to step over. Also specifies the direction of moving:
/// forward if positive, backward otherwise</param>
/// <returns>The actual number of units the position was moved over</returns>
private int MovePositionByUnits(ITextPointer position, TextUnit unit, int count)
{
ITextView textView;
int moved = 0;
int absCount = (count == int.MinValue) ? int.MaxValue : Math.Abs(count);
LogicalDirection direction = (count > 0) ? LogicalDirection.Forward : LogicalDirection.Backward;
// This method assumes that position is already snapped to appropriate TextUnit.
switch (unit)
{
case TextUnit.Character:
while (moved < absCount)
{
if (!TextPointerBase.MoveToNextInsertionPosition(position, direction))
{
break;
}
moved++;
}
break;
case TextUnit.Word:
while (moved < absCount)
{
if (!MoveToNextWordBoundary(position, direction))
{
break;
}
moved++;
}
break;
case TextUnit.Format:
// Formatting changes can be introduced by elements. Hence it is fair to
// assume that formatting boundaries are defined by non-text context.
while (moved < absCount)
{
ITextPointer positionOrig = position.CreatePointer();
// First skip all text in given direction.
while (position.GetPointerContext(direction) == TextPointerContext.Text)
{
if (!position.MoveToNextContextPosition(direction))
{
break;
}
}
// Move to next context
if (!position.MoveToNextContextPosition(direction))
{
break;
}
// Skip all formatting elements and position the pointer next to text.
while (position.GetPointerContext(direction) != TextPointerContext.Text)
{
if (!position.MoveToNextContextPosition(direction))
{
break;
}
}
// If moving backwards, position the pointer at the beginning of formatting range.
if (direction == LogicalDirection.Backward)
{
while (position.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.Text)
{
if (!position.MoveToNextContextPosition(LogicalDirection.Backward))
{
break;
}
}
}
if (position.GetPointerContext(direction) != TextPointerContext.None)
{
moved++;
}
else
{
position.MoveToPosition(positionOrig);
break;
}
}
// Adjust logical direction to point to the following text (forward or backward movement).
// If we don't do this, we'll normalize in the wrong direction and get stuck in a loop
// if caller tries to advance again.
position.SetLogicalDirection(LogicalDirection.Forward);
break;
case TextUnit.Line:
// Position is snapped to nearest line boundary. But since line information
// is based on the layout, position is not changed, if:
// a) it is not currently in the view, or
// b) containing line cannot be found.
textView = _textAdaptor.GetUpdatedTextView();
if (textView != null && textView.IsValid && textView.Contains(position))
{
// ITextPointer.MoveToLineBoundary can't handle Table row end positions.
// Mimic TextEditor's caret navigation code and move into the preceding
// TableCell.
if (TextPointerBase.IsAtRowEnd(position))
{
position.MoveToNextInsertionPosition(LogicalDirection.Backward);
}
moved = position.MoveToLineBoundary(count);
MoveToInsertionPosition(position, LogicalDirection.Forward);
if (moved < 0)
{
moved = -moved; // Will be reversed below.
}
}
break;
case TextUnit.Paragraph:
// Utilize TextRange logic to determine paragraph boundaries.
ITextRange paragraphRange = new TextRange(position, position);
paragraphRange.SelectParagraph(position);
while (moved < absCount)
{
position.MoveToPosition(direction == LogicalDirection.Forward ? paragraphRange.End : paragraphRange.Start);
if (!position.MoveToNextInsertionPosition(direction))
{
break;
}
moved++;
paragraphRange.SelectParagraph(position);
position.MoveToPosition(paragraphRange.Start); // Position it always at the beginning of the paragraph.
}
break;
case TextUnit.Page:
// But since page information is based on the layout, position is not changed, if:
// a) it is not currently in the view, or
// b) containing page cannot be found.
// Page movement is possible only in multi-page scenario.
textView = _textAdaptor.GetUpdatedTextView();
if (textView != null && textView.IsValid && textView.Contains(position))
{
if (textView is MultiPageTextView)
{
// Get embedded page ITextView for given position.
ITextView pageTextView = ((MultiPageTextView)textView).GetPageTextViewFromPosition(position);
ReadOnlyCollection<TextSegment> textSegments = pageTextView.TextSegments;
while (moved < absCount)
{
if (textSegments == null || textSegments.Count == 0)
{
break;
}
// Move the position to appropriate edge.
if (direction == LogicalDirection.Backward)
{
position.MoveToPosition(textSegments[0].Start);
MoveToInsertionPosition(position, LogicalDirection.Backward);
}
else
{
position.MoveToPosition(textSegments[textSegments.Count - 1].End);
MoveToInsertionPosition(position, LogicalDirection.Forward);
}
// Try to move the position to the next page.
ITextPointer positionTemp = position.CreatePointer();
if (!positionTemp.MoveToNextInsertionPosition(direction))
{
break;
}
else
{
// MoveToNextInsertionPosition may return 'true' and move the position
// in oposite direction.
if (direction == LogicalDirection.Forward)
{
if (positionTemp.CompareTo(position) <= 0)
{
break;
}
}
else
{
if (positionTemp.CompareTo(position) >= 0)
{
break;
}
}
}
// Get embedded page ITextView for given position.
if (!textView.Contains(positionTemp))
{
break;
}
pageTextView = ((MultiPageTextView)textView).GetPageTextViewFromPosition(positionTemp);
textSegments = pageTextView.TextSegments;
moved++;
}
}
}
break;
case TextUnit.Document:
// This method assumes that position is already snapped to appropriate TextUnit.
break;
}
return (direction == LogicalDirection.Forward) ? moved : -moved;
}
private static void OnSelectUpByParagraph(object sender, ExecutedRoutedEventArgs args)
{
TextEditor This = TextEditor._GetTextEditor(sender);
if (This == null || !This._IsEnabled || !This._IsSourceInScope(args.Source))
{
return;
}
TextEditorTyping._FlushPendingInputItems(This);
using (This.Selection.DeclareChangeBlock())
{
// Forget previously suggested horizontal position
TextEditorSelection._ClearSuggestedX(This);
// Discard typing undo unit merging
TextEditorTyping._BreakTypingSequence(This);
// Clear springload formatting
ClearSpringloadFormatting(This);
ITextPointer movingPointer = This.Selection.MovingPosition.CreatePointer();
ITextRange paragraphRange = new TextRange(movingPointer, movingPointer);
paragraphRange.SelectParagraph(movingPointer);
if (movingPointer.CompareTo(paragraphRange.Start) > 0)
{
// We are in the middle of a paragraph. Move to its start
ExtendSelectionAndBringIntoView(paragraphRange.Start, This);
}
else
{
movingPointer.MoveToPosition(paragraphRange.Start);
if (movingPointer.MoveToNextInsertionPosition(LogicalDirection.Backward))
{
// Previous paragraph found. Set selection to its start
paragraphRange.SelectParagraph(movingPointer);
ExtendSelectionAndBringIntoView(paragraphRange.Start, This);
}
}
}
}