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 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());
}
}
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;
}
}
static TextViewPosition GetUpDownCaretPosition(TextView textView, TextViewPosition caretPosition, CaretMovementType direction, VisualLine visualLine, TextLine textLine, bool enableVirtualSpace, ref double xPos)
{
// moving up/down happens using the desired visual X position
if (double.IsNaN(xPos))
{
xPos = visualLine.GetTextLineVisualXPosition(textLine, caretPosition.VisualColumn);
}
// 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 = textView.Document.GetLineByNumber(prevLineNumber);
targetVisualLine = 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 <= textView.Document.LineCount)
{
DocumentLine nextLine = textView.Document.GetLineByNumber(nextLineNumber);
targetVisualLine = 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 -= textView.RenderSize.Height;
}
else
{
yPos += textView.RenderSize.Height;
}
DocumentLine newLine = textView.GetDocumentLineByVisualTop(yPos);
targetVisualLine = textView.GetOrConstructVisualLine(newLine);
targetLine = targetVisualLine.GetTextLineByVisualYPosition(yPos);
break;
}
default:
throw new NotSupportedException(direction.ToString());
}
if (targetLine != null)
{
double yPos = targetVisualLine.GetTextLineVisualYPosition(targetLine, VisualYPosition.LineMiddle);
int newVisualColumn = targetVisualLine.GetVisualColumn(new Point(xPos, yPos), enableVirtualSpace);
// prevent wrapping to the next line; TODO: could 'IsAtEnd' help here?
int targetLineStartCol = targetVisualLine.GetTextLineVisualStartColumn(targetLine);
if (newVisualColumn >= targetLineStartCol + targetLine.Length)
{
if (newVisualColumn <= targetVisualLine.VisualLength)
{
newVisualColumn = targetLineStartCol + targetLine.Length - 1;
}
}
return(targetVisualLine.GetTextViewPosition(newVisualColumn));
}
else
{
return(caretPosition);
}
}
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;
}
}
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());
}
}
private static void MoveCaret(TextArea textArea, CaretMovementType direction)
{
var caretLine = textArea.Document.GetLineByNumber(textArea.Caret.Line);
var visualLine = textArea.TextView.GetOrConstructVisualLine(caretLine);
var caretPosition = textArea.Caret.Position;
var 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;
case CaretMovementType.MultyLeft:
textArea.Caret.Position = new TextViewPosition(caretPosition.Line, caretPosition.Column-1);
textArea.Caret.DesiredXPos = double.NaN;
break;
case CaretMovementType.MultyUp:
textArea.Caret.Position = new TextViewPosition(caretPosition.Line-1, caretPosition.Column);
textArea.Caret.DesiredXPos = double.NaN;
break;
case CaretMovementType.MultyRight:
textArea.Caret.Position = new TextViewPosition(caretPosition.Line, caretPosition.Column+1);
textArea.Caret.DesiredXPos = double.NaN;
break;
case CaretMovementType.MultyDown:
textArea.Caret.Position = new TextViewPosition(caretPosition.Line+1, caretPosition.Column);
textArea.Caret.DesiredXPos = double.NaN;
break;
default:
throw new NotSupportedException(direction.ToString());
}
}
static TextViewPosition GetUpDownCaretPosition(TextView textView, TextViewPosition caretPosition, CaretMovementType direction, VisualLine visualLine, TextLine textLine, bool enableVirtualSpace, ref double xPos)
{
// moving up/down happens using the desired visual X position
if (double.IsNaN(xPos))
xPos = visualLine.GetTextLineVisualXPosition(textLine, caretPosition.VisualColumn);
// 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 = textView.Document.GetLineByNumber(prevLineNumber);
targetVisualLine = 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 <= textView.Document.LineCount) {
DocumentLine nextLine = textView.Document.GetLineByNumber(nextLineNumber);
targetVisualLine = 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 -= textView.RenderSize.Height;
else
yPos += textView.RenderSize.Height;
DocumentLine newLine = textView.GetDocumentLineByVisualTop(yPos);
targetVisualLine = textView.GetOrConstructVisualLine(newLine);
targetLine = targetVisualLine.GetTextLineByVisualYPosition(yPos);
break;
}
default:
throw new NotSupportedException(direction.ToString());
}
if (targetLine != null) {
double yPos = targetVisualLine.GetTextLineVisualYPosition(targetLine, VisualYPosition.LineMiddle);
int newVisualColumn = targetVisualLine.GetVisualColumn(new Point(xPos, yPos), enableVirtualSpace);
// prevent wrapping to the next line; TODO: could 'IsAtEnd' help here?
int targetLineStartCol = targetVisualLine.GetTextLineVisualStartColumn(targetLine);
if (newVisualColumn >= targetLineStartCol + targetLine.Length) {
if (newVisualColumn <= targetVisualLine.VisualLength)
newVisualColumn = targetLineStartCol + targetLine.Length - 1;
}
return targetVisualLine.GetTextViewPosition(newVisualColumn);
} else {
return caretPosition;
}
}
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());
}
}