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// Unity C# reference source
// Copyright (c) Unity Technologies. For terms of use, see
// https://unity3d.com/legal/licenses/Unity_Reference_Only_License
using System;
using UnityEngine.TextCore.Text;
using static UnityEngine.TextEditor;
namespace UnityEngine
{
internal class TextSelectingUtilities
{
public DblClickSnapping dblClickSnap = DblClickSnapping.WORDS;
public int iAltCursorPos = -1;
public bool hasHorizontalCursorPos = false;
private bool m_bJustSelected = false;
private bool m_MouseDragSelectsWholeWords = false;
private int m_DblClickInitPos = 0;
TextHandle m_TextHandle;
private const int kMoveDownHeight = 5;
private const char kNewLineChar = '\n';
/// Does this text field has a selection
public bool hasSelection => cursorIndex != selectIndex;
bool m_RevealCursor;
public bool revealCursor
{
get => m_RevealCursor;
set
{
if (value != m_RevealCursor)
{
m_RevealCursor = value;
OnCursorIndexChange?.Invoke();
}
}
}
int m_CharacterCount => m_TextHandle.textInfo.characterCount;
int characterCount => (m_CharacterCount > 0 && m_TextHandle.textInfo.textElementInfo[m_CharacterCount - 1].character == 0x200B) ? m_CharacterCount - 1 : m_CharacterCount;
TextElementInfo[] m_TextElementInfos => m_TextHandle.textInfo.textElementInfo;
int m_CursorIndex = 0;
public int cursorIndex
{
get => EnsureValidCodePointIndex(m_CursorIndex);
set
{
if (m_CursorIndex != value)
{
m_CursorIndex = value;
revealCursor = true;
OnCursorIndexChange?.Invoke();
}
}
}
internal int m_SelectIndex = 0;
public int selectIndex
{
get => EnsureValidCodePointIndex(m_SelectIndex);
set
{
if (m_SelectIndex != value)
{
m_SelectIndex = value;
OnSelectIndexChange?.Invoke();
}
}
}
/// Returns the selected text
public string selectedText
{
get
{
if (cursorIndex == selectIndex)
return "";
if (cursorIndex < selectIndex)
return m_TextHandle.Substring(cursorIndex, selectIndex - cursorIndex);
else
return m_TextHandle.Substring(selectIndex, cursorIndex - selectIndex);
}
}
public TextSelectingUtilities(TextHandle textHandle)
{
m_TextHandle = textHandle;
}
public void ClearCursorPos()
{
hasHorizontalCursorPos = false;
iAltCursorPos = -1;
}
public void OnFocus(bool selectAll = true)
{
if (selectAll)
SelectAll();
revealCursor = true;
}
/// Select all the text
public void SelectAll()
{
cursorIndex = 0; selectIndex = Int32.MaxValue;
ClearCursorPos();
}
/// Select none of the text
public void SelectNone()
{
selectIndex = cursorIndex;
ClearCursorPos();
}
/// Expand the selection to the left
public void SelectLeft()
{
if (m_bJustSelected)
if (cursorIndex > selectIndex)
{ // swap
int tmp = cursorIndex;
cursorIndex = selectIndex;
selectIndex = tmp;
}
m_bJustSelected = false;
cursorIndex = PreviousCodePointIndex(cursorIndex);
}
public void SelectRight()
{
if (m_bJustSelected)
if (cursorIndex < selectIndex)
{ // swap
int tmp = cursorIndex;
cursorIndex = selectIndex;
selectIndex = tmp;
}
m_bJustSelected = false;
cursorIndex = NextCodePointIndex(cursorIndex);
}
public void SelectUp()
{
cursorIndex = m_TextHandle.LineUpCharacterPosition(cursorIndex);
}
public void SelectDown()
{
cursorIndex = m_TextHandle.LineDownCharacterPosition(cursorIndex);
}
/// Select to the end of the text
public void SelectTextEnd()
{
// This is not quite like the mac - there, when you select to end of text, the position of the cursor becomes somewhat i'll defined
// Hard to explain. In textedit, try: CMD-SHIFT-down, SHIFT-LEFT for case 1. then do CMD-SHIFT-down, SHIFT-RIGHT, SHIFT-LEFT for case 2.
// Anyways, it's wrong so we won't do that
cursorIndex = characterCount;
}
/// Select to the start of the text
public void SelectTextStart()
{
// Same thing as SelectTextEnd...
cursorIndex = 0;
}
public void SelectToStartOfNextWord()
{
ClearCursorPos();
cursorIndex = FindStartOfNextWord(cursorIndex);
}
public void SelectToEndOfPreviousWord()
{
ClearCursorPos();
cursorIndex = FindEndOfPreviousWord(cursorIndex);
}
public void SelectWordRight()
{
ClearCursorPos();
int cachedPos = selectIndex;
if (cursorIndex < selectIndex)
{
selectIndex = cursorIndex;
MoveWordRight();
selectIndex = cachedPos;
cursorIndex = cursorIndex < selectIndex ? cursorIndex : selectIndex;
return;
}
selectIndex = cursorIndex;
MoveWordRight();
selectIndex = cachedPos;
}
public void SelectWordLeft()
{
ClearCursorPos();
int cachedPos = selectIndex;
if (cursorIndex > selectIndex)
{
selectIndex = cursorIndex;
MoveWordLeft();
selectIndex = cachedPos;
cursorIndex = cursorIndex > selectIndex ? cursorIndex : selectIndex;
return;
}
selectIndex = cursorIndex;
MoveWordLeft();
selectIndex = cachedPos;
}
/// Move the selection point to the start of the line
/// Used on a Windows for SHIFT-Home
public void SelectGraphicalLineStart()
{
ClearCursorPos();
cursorIndex = GetGraphicalLineStart(cursorIndex);
}
/// Expand the selection to the end of the line
/// Used on a mac for SHIFT-End
public void SelectGraphicalLineEnd()
{
ClearCursorPos();
cursorIndex = GetGraphicalLineEnd(cursorIndex);
}
public void SelectParagraphForward()
{
ClearCursorPos();
bool wasBehind = cursorIndex < selectIndex;
if (cursorIndex < characterCount)
{
cursorIndex = IndexOfEndOfLine(cursorIndex + 1);
if (wasBehind && cursorIndex > selectIndex)
cursorIndex = selectIndex;
}
}
public void SelectParagraphBackward()
{
ClearCursorPos();
bool wasInFront = cursorIndex > selectIndex;
if (cursorIndex > 1)
{
cursorIndex = m_TextHandle.LastIndexOf(kNewLineChar, cursorIndex - 2) + 1;
if (wasInFront && cursorIndex < selectIndex)
cursorIndex = selectIndex;
}
else
selectIndex = cursorIndex = 0;
}
/// Select the word under the cursor
public void SelectCurrentWord()
{
var index = cursorIndex;
if (cursorIndex < selectIndex)
{
cursorIndex = FindEndOfClassification(index, Direction.Backward);
selectIndex = FindEndOfClassification(index, Direction.Forward);
}
else
{
cursorIndex = FindEndOfClassification(index, Direction.Forward);
selectIndex = FindEndOfClassification(index, Direction.Backward);
}
ClearCursorPos();
m_bJustSelected = true;
}
// Select the entire paragraph the cursor is on (separated by \n)
public void SelectCurrentParagraph()
{
ClearCursorPos();
int textLen = characterCount;
if (cursorIndex < textLen)
{
cursorIndex = IndexOfEndOfLine(cursorIndex) + 1;
}
if (selectIndex != 0)
selectIndex = m_TextHandle.LastIndexOf(kNewLineChar, selectIndex - 1) + 1;
}
/// Move the cursor one character to the right and deselect.
public void MoveRight()
{
ClearCursorPos();
if (selectIndex == cursorIndex)
{
cursorIndex = NextCodePointIndex(cursorIndex);
selectIndex = cursorIndex;
}
else
{
if (selectIndex > cursorIndex)
cursorIndex = selectIndex;
else
selectIndex = cursorIndex;
}
}
/// Move the cursor one character to the left and deselect.
public void MoveLeft()
{
if (selectIndex == cursorIndex)
{
cursorIndex = PreviousCodePointIndex(cursorIndex);
selectIndex = cursorIndex;
}
else
{
if (selectIndex > cursorIndex)
selectIndex = cursorIndex;
else
cursorIndex = selectIndex;
}
ClearCursorPos();
}
/// Move the cursor up and deselects.
public void MoveUp()
{
if (selectIndex < cursorIndex)
selectIndex = cursorIndex;
else
cursorIndex = selectIndex;
cursorIndex = selectIndex = m_TextHandle.LineUpCharacterPosition(cursorIndex);
if (cursorIndex <= 0)
ClearCursorPos();
}
/// Move the cursor down and deselects.
public void MoveDown()
{
if (selectIndex > cursorIndex)
selectIndex = cursorIndex;
else
cursorIndex = selectIndex;
cursorIndex = selectIndex = m_TextHandle.LineDownCharacterPosition(cursorIndex);
if (cursorIndex == characterCount)
ClearCursorPos();
}
/// Moves the cursor to the start of the current line.
public void MoveLineStart()
{
// we start from the left-most selected character
int p = selectIndex < cursorIndex ? selectIndex : cursorIndex;
// then we scan back to find the first newline
int i = p;
while (i-- != 0)
if (m_TextElementInfos[i].character == kNewLineChar)
{
selectIndex = cursorIndex = i + 1;
return;
}
selectIndex = cursorIndex = 0;
}
/// Moves the selection to the end of the current line
public void MoveLineEnd()
{
// we start from the right-most selected character
int p = selectIndex > cursorIndex ? selectIndex : cursorIndex;
// then we scan forward to find the first newline
int i = p;
int strlen = characterCount;
while (i < strlen)
{
if (m_TextElementInfos[i].character == kNewLineChar)
{
selectIndex = cursorIndex = i;
return;
}
i++;
}
selectIndex = cursorIndex = strlen;
}
/// Move to the start of the current graphical line. This takes word-wrapping into consideration.
public void MoveGraphicalLineStart()
{
cursorIndex = selectIndex = GetGraphicalLineStart(cursorIndex < selectIndex ? cursorIndex : selectIndex);
}
/// Move to the end of the current graphical line. This takes word-wrapping into consideration.
public void MoveGraphicalLineEnd()
{
cursorIndex = selectIndex = GetGraphicalLineEnd(cursorIndex > selectIndex ? cursorIndex : selectIndex);
}
/// Moves the cursor to the beginning of the text
public void MoveTextStart()
{
selectIndex = cursorIndex = 0;
}
/// Moves the cursor to the end of the text
public void MoveTextEnd()
{
selectIndex = cursorIndex = characterCount;
}
/// Move to the next paragraph
public void MoveParagraphForward()
{
cursorIndex = cursorIndex > selectIndex ? cursorIndex : selectIndex;
if (cursorIndex < characterCount)
{
selectIndex = cursorIndex = IndexOfEndOfLine(cursorIndex + 1);
}
}
/// Move to the previous paragraph
public void MoveParagraphBackward()
{
cursorIndex = cursorIndex < selectIndex ? cursorIndex : selectIndex;
if (cursorIndex > 1)
{
selectIndex = cursorIndex = m_TextHandle.LastIndexOf(kNewLineChar, cursorIndex - 2) + 1;
}
else
selectIndex = cursorIndex = 0;
}
/// Move to the end of the word.
/// If the cursor is over some space characters, these are skipped
/// Then, the cursor moves to the end of the following word.
/// This corresponds to Alt-RightArrow on a Mac
public void MoveWordRight()
{
cursorIndex = cursorIndex > selectIndex ? cursorIndex : selectIndex;
cursorIndex = selectIndex = FindNextSeperator(cursorIndex);
ClearCursorPos();
}
public void MoveToStartOfNextWord()
{
ClearCursorPos();
if (cursorIndex != selectIndex)
{
MoveRight();
return;
}
cursorIndex = selectIndex = FindStartOfNextWord(cursorIndex);
}
public void MoveToEndOfPreviousWord()
{
ClearCursorPos();
if (cursorIndex != selectIndex)
{
MoveLeft();
return;
}
cursorIndex = selectIndex = FindEndOfPreviousWord(cursorIndex);
}
public void MoveWordLeft()
{
cursorIndex = cursorIndex < selectIndex ? cursorIndex : selectIndex;
cursorIndex = FindPrevSeperator(cursorIndex);
selectIndex = cursorIndex;
}
/// sets whether the text selection is done by dbl click or not
public void MouseDragSelectsWholeWords(bool on)
{
m_MouseDragSelectsWholeWords = on;
m_DblClickInitPos = cursorIndex;
}
/// Expand the selection to the start of the line
/// Used on a mac for CMD-SHIFT-LEFT
public void ExpandSelectGraphicalLineStart()
{
ClearCursorPos();
if (cursorIndex < selectIndex)
cursorIndex = GetGraphicalLineStart(cursorIndex);
else
{
int temp = cursorIndex;
cursorIndex = GetGraphicalLineStart(selectIndex);
selectIndex = temp;
}
}
/// Expand the selection to the end of the line
/// Used on a mac for CMD-SHIFT-RIGHT
public void ExpandSelectGraphicalLineEnd()
{
ClearCursorPos();
if (cursorIndex > selectIndex)
cursorIndex = GetGraphicalLineEnd(cursorIndex);
else
{
int temp = cursorIndex;
cursorIndex = GetGraphicalLineEnd(selectIndex);
selectIndex = temp;
}
}
public void DblClickSnap(DblClickSnapping snapping)
{
dblClickSnap = snapping;
}
protected internal void MoveCursorToPosition_Internal(Vector2 cursorPosition, bool shift)
{
selectIndex = m_TextHandle.GetCursorIndexFromPosition(cursorPosition);
if (!shift)
{
cursorIndex = selectIndex;
}
}
// Do a drag selection. Used to expand the selection in MouseDrag events.
public void SelectToPosition(Vector2 cursorPosition)
{
if (!m_MouseDragSelectsWholeWords)
cursorIndex = m_TextHandle.GetCursorIndexFromPosition(cursorPosition);
else // snap to words/paragraphs
{
int p = m_TextHandle.GetCursorIndexFromPosition(cursorPosition);
p = EnsureValidCodePointIndex(p);
m_DblClickInitPos = EnsureValidCodePointIndex(m_DblClickInitPos);
if (dblClickSnap == DblClickSnapping.WORDS)
{
if (p < m_DblClickInitPos)
{
cursorIndex = FindEndOfClassification(p, Direction.Backward);
selectIndex = FindEndOfClassification(m_DblClickInitPos, Direction.Forward);
}
else
{
cursorIndex = FindEndOfClassification(p, Direction.Forward);
selectIndex = FindEndOfClassification(m_DblClickInitPos, Direction.Backward);
}
} // paragraph
else
{
if (p < m_DblClickInitPos)
{
if (p > 0)
cursorIndex = m_TextHandle.LastIndexOf(kNewLineChar, Mathf.Max(0, p - 2)) + 1;
else
cursorIndex = 0;
selectIndex = m_TextHandle.LastIndexOf(kNewLineChar, Mathf.Min(characterCount - 1, m_DblClickInitPos));
}
else
{
if (p < characterCount)
{
cursorIndex = IndexOfEndOfLine(p);
}
else
cursorIndex = characterCount;
selectIndex = m_TextHandle.LastIndexOf(kNewLineChar, Mathf.Max(0, m_DblClickInitPos - 2)) + 1;
}
}
}
}
int FindNextSeperator(int startPos)
{
int textLen = characterCount;
while (startPos < textLen && ClassifyChar(startPos) != CharacterType.LetterLike)
startPos = NextCodePointIndex(startPos);
while (startPos < textLen && ClassifyChar(startPos) == CharacterType.LetterLike)
startPos = NextCodePointIndex(startPos);
return startPos;
}
int FindPrevSeperator(int startPos)
{
startPos = PreviousCodePointIndex(startPos);
while (startPos > 0 && ClassifyChar(startPos) != CharacterType.LetterLike)
startPos = PreviousCodePointIndex(startPos);
if (startPos == 0)
return 0;
while (startPos > 0 && ClassifyChar(startPos) == CharacterType.LetterLike)
startPos = PreviousCodePointIndex(startPos);
if (ClassifyChar(startPos) == CharacterType.LetterLike)
return startPos;
return NextCodePointIndex(startPos);
}
public int FindStartOfNextWord(int p)
{
int textLen = characterCount;
if (p == textLen)
return p;
// Find out which char type we're at...
CharacterType t = ClassifyChar(p);
if (t != CharacterType.WhiteSpace)
{
p = NextCodePointIndex(p);
while (p < textLen && ClassifyChar(p) == t)
p = NextCodePointIndex(p);
}
else
{
if (m_TextElementInfos[p].character == '\t' || m_TextElementInfos[p].character == kNewLineChar)
return NextCodePointIndex(p);
}
if (p == textLen)
return p;
// Skip spaces
if (m_TextElementInfos[p].character == ' ') // If we're at a space, skip over any number of spaces
{
while (p < textLen && ClassifyChar(p) == CharacterType.WhiteSpace)
p = NextCodePointIndex(p);
}
else if (m_TextElementInfos[p].character == '\t' || m_TextElementInfos[p].character == kNewLineChar) // If we're at a tab or a newline, just step one char ahead
{
return p;
}
return p;
}
public int FindEndOfPreviousWord(int p)
{
if (p == 0)
return p;
p = PreviousCodePointIndex(p);
// Skip spaces
while (p > 0 && m_TextElementInfos[p].character == ' ')
p = PreviousCodePointIndex(p);
CharacterType t = ClassifyChar(p);
if (t != CharacterType.WhiteSpace)
{
while (p > 0 && ClassifyChar(PreviousCodePointIndex(p)) == t)
p = PreviousCodePointIndex(p);
}
return p;
}
int FindEndOfClassification(int p, Direction dir)
{
if (characterCount == 0)
return 0;
if (p == characterCount)
p = PreviousCodePointIndex(p);
var t = ClassifyChar(p);
if (t == CharacterType.NewLine)
return p;
do
{
switch (dir)
{
case Direction.Backward:
p = PreviousCodePointIndex(p);
if (p == 0)
return ClassifyChar(0) == t ? 0 : NextCodePointIndex(0);
break;
case Direction.Forward:
p = NextCodePointIndex(p);
if (p == characterCount)
return characterCount;
break;
}
}
while (ClassifyChar(p) == t);
if (dir == Direction.Forward)
return p;
return NextCodePointIndex(p);
}
internal Action OnCursorIndexChange;
internal Action OnSelectIndexChange;
int ClampTextIndex(int index)
{
return Mathf.Clamp(index, 0, characterCount);
}
internal int EnsureValidCodePointIndex(int index)
{
index = ClampTextIndex(index);
if (!IsValidCodePointIndex(index))
index = NextCodePointIndex(index);
return index;
}
bool IsValidCodePointIndex(int index)
{
if (index < 0 || index > characterCount)
return false;
if (index == 0 || index == characterCount)
return true;
return !char.IsLowSurrogate(m_TextElementInfos[index].character);
}
int IndexOfEndOfLine(int startIndex)
{
int index = m_TextHandle.IndexOf(kNewLineChar, startIndex);
return (index != -1 ? index : characterCount);
}
public int PreviousCodePointIndex(int index)
{
if (index > 0)
index--;
while (index > 0 && char.IsLowSurrogate(m_TextElementInfos[index].character))
index--;
return index;
}
public int NextCodePointIndex(int index)
{
if (index < characterCount)
index++;
while (index < characterCount && char.IsLowSurrogate(m_TextElementInfos[index].character))
index++;
return index;
}
int GetGraphicalLineStart(int p)
{
Vector2 point = m_TextHandle.GetCursorPositionFromStringIndexUsingLineHeight(p);
point.y -= 1.0f / GUIUtility.pixelsPerPoint; // we make sure no floating point errors can make us land on another line
point.x = 0;
return m_TextHandle.GetCursorIndexFromPosition(point);
}
int GetGraphicalLineEnd(int p)
{
Vector2 point = m_TextHandle.GetCursorPositionFromStringIndexUsingLineHeight(p);
point.y -= 1.0f / GUIUtility.pixelsPerPoint; // we make sure no floating point errors can make us land on another line
point.x += 5000;
return m_TextHandle.GetCursorIndexFromPosition(point);
}
public void Copy()
{
if (selectIndex == cursorIndex)
return;
GUIUtility.systemCopyBuffer = selectedText;
}
enum CharacterType
{
LetterLike,
Symbol, Symbol2,
WhiteSpace,
NewLine,
}
enum Direction
{
Forward,
Backward,
}
CharacterType ClassifyChar(int index)
{
char c = m_TextElementInfos[index].character;
if (c == kNewLineChar)
return CharacterType.NewLine;
if (char.IsWhiteSpace(c))
return CharacterType.WhiteSpace;
if (char.IsLetterOrDigit(c) || m_TextElementInfos[index].character == '\'')
return CharacterType.LetterLike;
return CharacterType.Symbol;
}
}
}