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Cursor.cs
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Cursor.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.UI.Core;
using Windows.UI.Xaml;
namespace TextControlBox_TestApp.TextControlBox.Helper
{
public class CursorPosition
{
public CursorPosition(int CharacterPosition = 0, int LineNumber = 0)
{
this.CharacterPosition = CharacterPosition;
this.LineNumber = LineNumber;
}
public CursorPosition(CursorPosition CurrentCursorPosition)
{
if (CurrentCursorPosition == null)
return;
this.CharacterPosition = CurrentCursorPosition.CharacterPosition;
this.LineNumber = CurrentCursorPosition.LineNumber;
}
public int CharacterPosition { get; set; } = 0;
public int LineNumber { get; set; } = 0;
public CursorPosition Change(int CharacterPosition, int LineNumber)
{
this.CharacterPosition = CharacterPosition;
this.LineNumber = LineNumber;
return this;
}
public new string ToString()
{
return LineNumber + ":" + CharacterPosition;
}
public CursorPosition ChangeLineNumber(int LineNumber)
{
this.LineNumber = LineNumber;
return this;
}
public static CursorPosition ChangeCharacterPosition(CursorPosition CurrentCursorPosition, int CharacterPosition)
{
return new CursorPosition(CharacterPosition, CurrentCursorPosition.LineNumber);
}
public static CursorPosition ChangeLineNumber(CursorPosition CurrentCursorPosition, int LineNumber)
{
return new CursorPosition(CurrentCursorPosition.CharacterPosition, LineNumber);
}
}
public class Cursor
{
private static bool ControlIsPressed { get => Window.Current.CoreWindow.GetKeyState(Windows.System.VirtualKey.Control).HasFlag(CoreVirtualKeyStates.Down); }
public static int CursorPositionToIndex(List<Line> TotalLines, CursorPosition CursorPosition)
{
int CursorIndex = 0;
for (int i = 0; i < CursorPosition.LineNumber; i++)
{
CursorIndex += TotalLines[i].Length + 2;
}
return CursorIndex + CursorPosition.CharacterPosition;
}
//Convert the coordinates from Relative to Absolute and the other way around
public static CursorPosition RelativeToAbsolute(CursorPosition curpos, int nmbOfUnrenderdLines)
{
return CursorPosition.ChangeLineNumber(curpos, curpos.LineNumber - nmbOfUnrenderdLines);
}
public static CursorPosition AbsoluteToRelative(CursorPosition curpos, int nmbOfUnrenderdLines)
{
return CursorPosition.ChangeLineNumber(curpos, curpos.LineNumber + nmbOfUnrenderdLines);
}
//Move selectionend:
public static CursorPosition MoveSelectionLeft(CursorPosition SelectionEndPosition, List<Line> TotalLines)
{
CursorPosition ReturnValue = new CursorPosition(SelectionEndPosition);
if (SelectionEndPosition == null)
return ReturnValue;
//If a selection has been started, continue the selection
int Line = ReturnValue.LineNumber;
int StepsToMoveLeft = CalculateStepsToMoveLeft(TotalLines[Line < TotalLines.Count ? Line : TotalLines.Count -1], SelectionEndPosition.CharacterPosition);
if (SelectionEndPosition.CharacterPosition == 0)
{
ReturnValue.LineNumber = Line > 0 ? Line-- : Line;
if (Line < ReturnValue.LineNumber)
{
ReturnValue.LineNumber--;
ReturnValue.CharacterPosition = TotalLines[ReturnValue.LineNumber].Length;
}
else
ReturnValue.CharacterPosition -= StepsToMoveLeft;
}
else
{
ReturnValue.CharacterPosition -= StepsToMoveLeft;
}
if (ReturnValue.CharacterPosition < 0)
ReturnValue.CharacterPosition = 0;
return ReturnValue;
}
public static CursorPosition MoveSelectionRight(CursorPosition SelectionEndPosition, List<Line> TotalLines, Line CurrentLine)
{
CursorPosition ReturnValue = new CursorPosition(SelectionEndPosition);
if (SelectionEndPosition == null || CurrentLine == null)
return ReturnValue;
int StepsToMoveRight = CalculateStepsToMoveRight(TotalLines[SelectionEndPosition.LineNumber], SelectionEndPosition.CharacterPosition);
if (SelectionEndPosition.CharacterPosition == CurrentLine.Length)
{
ReturnValue.LineNumber += SelectionEndPosition.LineNumber < TotalLines.Count ? 1 : 0;
if (SelectionEndPosition.LineNumber < ReturnValue.LineNumber)
ReturnValue.CharacterPosition = 0;
else
ReturnValue.CharacterPosition += StepsToMoveRight;
}
else
{
ReturnValue.LineNumber = SelectionEndPosition.LineNumber;
ReturnValue.CharacterPosition += StepsToMoveRight;
}
return ReturnValue;
}
public static CursorPosition MoveSelectionUp(CursorPosition SelectionEndPosition, List<Line> TotalLines)
{
CursorPosition ReturnValue = new CursorPosition(SelectionEndPosition);
if (SelectionEndPosition == null)
return ReturnValue;
if (1 < SelectionEndPosition.LineNumber+1)
{
Line PreviousLine = TotalLines[SelectionEndPosition.LineNumber +1];
if (PreviousLine == null)
return ReturnValue;
int PreviousLineLenght = PreviousLine.Length;
ReturnValue.LineNumber--;
if (PreviousLineLenght > SelectionEndPosition.CharacterPosition)
ReturnValue.CharacterPosition = SelectionEndPosition.CharacterPosition;
else
ReturnValue.CharacterPosition = PreviousLineLenght;
}
if (ReturnValue.LineNumber < 0)
ReturnValue.LineNumber = 0;
return ReturnValue;
}
public static CursorPosition MoveSelectionDown(CursorPosition SelectionEndPosition, List<Line> TotalLines)
{
CursorPosition ReturnValue = new CursorPosition(SelectionEndPosition);
if (SelectionEndPosition == null)
return ReturnValue;
if (TotalLines.Count > SelectionEndPosition.LineNumber)
{
int NextLineLenght = TotalLines[SelectionEndPosition.LineNumber].Length;
ReturnValue.LineNumber++;
if (NextLineLenght > SelectionEndPosition.CharacterPosition)
ReturnValue.CharacterPosition = SelectionEndPosition.CharacterPosition;
else
ReturnValue.CharacterPosition = NextLineLenght;
}
return ReturnValue;
}
//Calculate the number of characters from the cursorposition to the next character or digit to the left and to the right
public static int CalculateStepsToMoveLeft2(Line CurrentLine, int CursorCharPosition)
{
int Count = 0;
for (int i = CursorCharPosition - 1; i >= 0; i--)
{
char CurrentCharacter = CurrentLine.Content[i];
if (char.IsLetterOrDigit(CurrentCharacter))
Count++;
else if (i == CursorCharPosition - 1 && char.IsWhiteSpace(CurrentCharacter))
return 0;
else
break;
}
//If it ignores the ControlKey return the real value of Count otherwise
//return 1 if Count is 0
return Count;
}
public static int CalculateStepsToMoveRight2(Line CurrentLine, int CursorCharPosition)
{
int Count = 0;
for(int i = CursorCharPosition; i < CurrentLine.Length; i++)
{
if (char.IsLetterOrDigit(CurrentLine.Content[i]))
Count++;
else if (i == CursorCharPosition && char.IsWhiteSpace(CurrentLine.Content[i]))
return 0;
else
break;
}
//If it ignores the ControlKey return the real value of Count otherwise
//return 1 if Count is 0
return Count;
}
//Calculates how many characters the cursor needs to move if control is pressed
//Returns 1 if control is not pressed
public static int CalculateStepsToMoveLeft(Line CurrentLine, int CursorCharPosition)
{
if (!ControlIsPressed)
return 1;
int Count = 0;
for (int i = CursorCharPosition - 1; i >= 0; i--)
{
char CurrentCharacter = CurrentLine.Content[i];
if (char.IsLetterOrDigit(CurrentCharacter))
Count++;
else if (i == CursorCharPosition - 1 && char.IsWhiteSpace(CurrentCharacter))
Count++;
else
break;
}
//If it ignores the ControlKey return the real value of Count otherwise
//return 1 if Count is 0
return Count == 0 ? 1 : Count;
}
public static int CalculateStepsToMoveRight(Line CurrentLine, int CursorCharPosition)
{
if (!ControlIsPressed)
return 1;
int Count = 0;
for (int i = CursorCharPosition; i < CurrentLine.Length; i++)
{
if (char.IsLetterOrDigit(CurrentLine.Content[i]))
Count++;
else if (i == CursorCharPosition && char.IsWhiteSpace(CurrentLine.Content[i]))
Count++;
else
break;
}
//If it ignores the ControlKey return the real value of Count otherwise
//return 1 if Count is 0
return Count == 0 ? 1 : Count;
}
//Move cursor:
public static CursorPosition MoveLeft(CursorPosition CurrentCursorPosition, List<Line> TotalLines)
{
CursorPosition ReturnValue = new CursorPosition(CurrentCursorPosition);
int Line = CurrentCursorPosition.LineNumber;
int StepsToMoveLeft = CalculateStepsToMoveLeft(TotalLines[Line-1], CurrentCursorPosition.CharacterPosition);
if (CurrentCursorPosition.CharacterPosition == 0)
{
ReturnValue.LineNumber = Line > 1 ? Line-- : Line;
if (Line < ReturnValue.LineNumber)
{
ReturnValue.LineNumber -= StepsToMoveLeft;
ReturnValue.CharacterPosition = TotalLines[ReturnValue.LineNumber - 1].Length;
}
else
ReturnValue.CharacterPosition -= StepsToMoveLeft;
}
else
{
ReturnValue.LineNumber = Line;
ReturnValue.CharacterPosition -= StepsToMoveLeft;
}
if (ReturnValue.CharacterPosition < 0)
ReturnValue.CharacterPosition = 0;
return ReturnValue;
}
public static CursorPosition MoveRight(CursorPosition CurrentCursorPosition, List<Line> TotalLines, Line CurrentLine)
{
CursorPosition ReturnValue = new CursorPosition(CurrentCursorPosition);
int StepsToMoveRight = CalculateStepsToMoveRight(CurrentLine, CurrentCursorPosition.CharacterPosition);
if (CurrentCursorPosition.CharacterPosition == CurrentLine.Length)
{
ReturnValue.LineNumber += CurrentCursorPosition.LineNumber < TotalLines.Count ? 1 : 0;
if (CurrentCursorPosition.LineNumber < ReturnValue.LineNumber)
ReturnValue.CharacterPosition = 0;
else
ReturnValue.CharacterPosition += StepsToMoveRight;
}
else
{
ReturnValue.LineNumber = CurrentCursorPosition.LineNumber;
ReturnValue.CharacterPosition += StepsToMoveRight;
}
var LineLength = TotalLines[ReturnValue.LineNumber-1].Length;
if (ReturnValue.CharacterPosition >= LineLength)
ReturnValue.CharacterPosition = LineLength;
return ReturnValue;
}
public static CursorPosition MoveDown(CursorPosition CurrentCursorPosition, List<Line> TotalLines)
{
CursorPosition ReturnValue = new CursorPosition(CurrentCursorPosition);
if (TotalLines.Count > CurrentCursorPosition.LineNumber && CurrentCursorPosition.LineNumber > 0)
{
int NextLineLenght = TotalLines[CurrentCursorPosition.LineNumber].Length;
ReturnValue.LineNumber++;
if (NextLineLenght > CurrentCursorPosition.CharacterPosition)
ReturnValue.CharacterPosition = CurrentCursorPosition.CharacterPosition;
else
ReturnValue.CharacterPosition = NextLineLenght;
}
return ReturnValue;
}
public static CursorPosition MoveUp(CursorPosition CurrentCursorPosition, List<Line> TotalLines)
{
if (CurrentCursorPosition.LineNumber > 1)
{
CurrentCursorPosition = CursorPosition.ChangeLineNumber(CurrentCursorPosition, CurrentCursorPosition.LineNumber - 1);
Line PreviousLine = TotalLines[CurrentCursorPosition.LineNumber - 1];
if (PreviousLine == null)
return CurrentCursorPosition;
int PreviousLineLenght = PreviousLine.Length;
if (PreviousLineLenght > CurrentCursorPosition.CharacterPosition)
CurrentCursorPosition.CharacterPosition = CurrentCursorPosition.CharacterPosition;
else
CurrentCursorPosition.CharacterPosition = PreviousLineLenght;
}
return CurrentCursorPosition;
}
}
}