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TextEditor.cpp
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#include <algorithm>
#include <chrono>
#include <string>
#include <regex>
#include <cmath>
#include "TextEditor.h"
#define IMGUI_DEFINE_MATH_OPERATORS
#include "imgui.h" // for imGui::GetCurrentWindow()
// TODO
// - multiline comments vs single-line: latter is blocking start of a ML
template<class InputIt1, class InputIt2, class BinaryPredicate>
bool equals(InputIt1 first1, InputIt1 last1,
InputIt2 first2, InputIt2 last2, BinaryPredicate p)
{
for (; first1 != last1 && first2 != last2; ++first1, ++first2)
{
if (!p(*first1, *first2))
return false;
}
return first1 == last1 && first2 == last2;
}
TextEditor::TextEditor()
: mLineSpacing(1.0f)
, mUndoIndex(0)
, mTabSize(4)
, mOverwrite(false)
, mReadOnly(false)
, mWithinRender(false)
, mScrollToCursor(false)
, mScrollToTop(false)
, mTextChanged(false)
, mColorizerEnabled(true)
, mTextStart(20.0f)
, mLeftMargin(10)
, mCursorPositionChanged(false)
, mColorRangeMin(0)
, mColorRangeMax(0)
, mSelectionMode(SelectionMode::Normal)
, mCheckComments(true)
, mLastClick(-1.0f)
, mHandleKeyboardInputs(true)
, mHandleMouseInputs(true)
, mIgnoreImGuiChild(false)
, mShowWhitespaces(true)
, mStartTime(std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count())
{
SetPalette(GetDarkPalette());
SetLanguageDefinition(LanguageDefinition::HLSL());
mLines.push_back(Line());
}
TextEditor::~TextEditor()
{
}
void TextEditor::SetLanguageDefinition(const LanguageDefinition & aLanguageDef)
{
mLanguageDefinition = aLanguageDef;
mRegexList.clear();
for (auto& r : mLanguageDefinition.mTokenRegexStrings)
mRegexList.push_back(std::make_pair(std::regex(r.first, std::regex_constants::optimize), r.second));
Colorize();
}
void TextEditor::SetPalette(const Palette & aValue)
{
mPaletteBase = aValue;
}
std::string TextEditor::GetText(const Coordinates & aStart, const Coordinates & aEnd) const
{
std::string result;
auto lstart = aStart.mLine;
auto lend = aEnd.mLine;
auto istart = GetCharacterIndex(aStart);
auto iend = GetCharacterIndex(aEnd);
size_t s = 0;
for (size_t i = lstart; i < lend; i++)
s += mLines[i].size();
result.reserve(s + s / 8);
while (istart < iend || lstart < lend)
{
if (lstart >= (int)mLines.size())
break;
auto& line = mLines[lstart];
if (istart < (int)line.size())
{
result += line[istart].mChar;
istart++;
}
else
{
istart = 0;
++lstart;
if(lstart < lend)
result += '\n';
}
}
return result;
}
TextEditor::Coordinates TextEditor::GetActualCursorCoordinates() const
{
return SanitizeCoordinates(mState.mCursorPosition);
}
TextEditor::Coordinates TextEditor::SanitizeCoordinates(const Coordinates & aValue) const
{
auto line = aValue.mLine;
auto column = aValue.mColumn;
if (line >= (int)mLines.size())
{
if (mLines.empty())
{
line = 0;
column = 0;
}
else
{
line = (int)mLines.size() - 1;
column = GetLineMaxColumn(line);
}
return Coordinates(line, column);
}
else
{
column = mLines.empty() ? 0 : std::min(column, GetLineMaxColumn(line));
return Coordinates(line, column);
}
}
// https://en.wikipedia.org/wiki/UTF-8
// We assume that the char is a standalone character (<128) or a leading byte of an UTF-8 code sequence (non-10xxxxxx code)
static int UTF8CharLength(TextEditor::Char c)
{
if ((c & 0xFE) == 0xFC)
return 6;
if ((c & 0xFC) == 0xF8)
return 5;
if ((c & 0xF8) == 0xF0)
return 4;
else if ((c & 0xF0) == 0xE0)
return 3;
else if ((c & 0xE0) == 0xC0)
return 2;
return 1;
}
// "Borrowed" from ImGui source
static inline int ImTextCharToUtf8(char* buf, int buf_size, unsigned int c)
{
if (c < 0x80)
{
buf[0] = (char)c;
return 1;
}
if (c < 0x800)
{
if (buf_size < 2) return 0;
buf[0] = (char)(0xc0 + (c >> 6));
buf[1] = (char)(0x80 + (c & 0x3f));
return 2;
}
if (c >= 0xdc00 && c < 0xe000)
{
return 0;
}
if (c >= 0xd800 && c < 0xdc00)
{
if (buf_size < 4) return 0;
buf[0] = (char)(0xf0 + (c >> 18));
buf[1] = (char)(0x80 + ((c >> 12) & 0x3f));
buf[2] = (char)(0x80 + ((c >> 6) & 0x3f));
buf[3] = (char)(0x80 + ((c) & 0x3f));
return 4;
}
//else if (c < 0x10000)
{
if (buf_size < 3) return 0;
buf[0] = (char)(0xe0 + (c >> 12));
buf[1] = (char)(0x80 + ((c >> 6) & 0x3f));
buf[2] = (char)(0x80 + ((c) & 0x3f));
return 3;
}
}
void TextEditor::Advance(Coordinates & aCoordinates) const
{
if (aCoordinates.mLine < (int)mLines.size())
{
auto& line = mLines[aCoordinates.mLine];
auto cindex = GetCharacterIndex(aCoordinates);
if (cindex + 1 < (int)line.size())
{
auto delta = UTF8CharLength(line[cindex].mChar);
cindex = std::min(cindex + delta, (int)line.size() - 1);
}
else
{
++aCoordinates.mLine;
cindex = 0;
}
aCoordinates.mColumn = GetCharacterColumn(aCoordinates.mLine, cindex);
}
}
void TextEditor::DeleteRange(const Coordinates & aStart, const Coordinates & aEnd)
{
assert(aEnd >= aStart);
assert(!mReadOnly);
//printf("D(%d.%d)-(%d.%d)\n", aStart.mLine, aStart.mColumn, aEnd.mLine, aEnd.mColumn);
if (aEnd == aStart)
return;
auto start = GetCharacterIndex(aStart);
auto end = GetCharacterIndex(aEnd);
if (aStart.mLine == aEnd.mLine)
{
auto& line = mLines[aStart.mLine];
auto n = GetLineMaxColumn(aStart.mLine);
if (aEnd.mColumn >= n)
line.erase(line.begin() + start, line.end());
else
line.erase(line.begin() + start, line.begin() + end);
}
else
{
auto& firstLine = mLines[aStart.mLine];
auto& lastLine = mLines[aEnd.mLine];
firstLine.erase(firstLine.begin() + start, firstLine.end());
lastLine.erase(lastLine.begin(), lastLine.begin() + end);
if (aStart.mLine < aEnd.mLine)
firstLine.insert(firstLine.end(), lastLine.begin(), lastLine.end());
if (aStart.mLine < aEnd.mLine)
RemoveLine(aStart.mLine + 1, aEnd.mLine + 1);
}
mTextChanged = true;
}
int TextEditor::InsertTextAt(Coordinates& /* inout */ aWhere, const char * aValue)
{
assert(!mReadOnly);
int cindex = GetCharacterIndex(aWhere);
int totalLines = 0;
while (*aValue != '\0')
{
assert(!mLines.empty());
if (*aValue == '\r')
{
// skip
++aValue;
}
else if (*aValue == '\n')
{
if (cindex < (int)mLines[aWhere.mLine].size())
{
auto& newLine = InsertLine(aWhere.mLine + 1);
auto& line = mLines[aWhere.mLine];
newLine.insert(newLine.begin(), line.begin() + cindex, line.end());
line.erase(line.begin() + cindex, line.end());
}
else
{
InsertLine(aWhere.mLine + 1);
}
++aWhere.mLine;
aWhere.mColumn = 0;
cindex = 0;
++totalLines;
++aValue;
}
else
{
auto& line = mLines[aWhere.mLine];
auto d = UTF8CharLength(*aValue);
while (d-- > 0 && *aValue != '\0')
line.insert(line.begin() + cindex++, Glyph(*aValue++, PaletteIndex::Default));
++aWhere.mColumn;
}
mTextChanged = true;
}
return totalLines;
}
void TextEditor::AddUndo(UndoRecord& aValue)
{
assert(!mReadOnly);
//printf("AddUndo: (@%d.%d) +\'%s' [%d.%d .. %d.%d], -\'%s', [%d.%d .. %d.%d] (@%d.%d)\n",
// aValue.mBefore.mCursorPosition.mLine, aValue.mBefore.mCursorPosition.mColumn,
// aValue.mAdded.c_str(), aValue.mAddedStart.mLine, aValue.mAddedStart.mColumn, aValue.mAddedEnd.mLine, aValue.mAddedEnd.mColumn,
// aValue.mRemoved.c_str(), aValue.mRemovedStart.mLine, aValue.mRemovedStart.mColumn, aValue.mRemovedEnd.mLine, aValue.mRemovedEnd.mColumn,
// aValue.mAfter.mCursorPosition.mLine, aValue.mAfter.mCursorPosition.mColumn
// );
mUndoBuffer.resize((size_t)(mUndoIndex + 1));
mUndoBuffer.back() = aValue;
++mUndoIndex;
}
TextEditor::Coordinates TextEditor::ScreenPosToCoordinates(const ImVec2& aPosition) const
{
ImVec2 origin = ImGui::GetCursorScreenPos();
ImVec2 local(aPosition.x - origin.x, aPosition.y - origin.y);
int lineNo = std::max(0, (int)floor(local.y / mCharAdvance.y));
int columnCoord = 0;
if (lineNo >= 0 && lineNo < (int)mLines.size())
{
auto& line = mLines.at(lineNo);
int columnIndex = 0;
float columnX = 0.0f;
while ((size_t)columnIndex < line.size())
{
float columnWidth = 0.0f;
if (line[columnIndex].mChar == '\t')
{
float spaceSize = ImGui::GetFont()->CalcTextSizeA(ImGui::GetFontSize(), FLT_MAX, -1.0f, " ").x;
float oldX = columnX;
float newColumnX = (1.0f + std::floor((1.0f + columnX) / (float(mTabSize) * spaceSize))) * (float(mTabSize) * spaceSize);
columnWidth = newColumnX - oldX;
if (mTextStart + columnX + columnWidth * 0.5f > local.x)
break;
columnX = newColumnX;
columnCoord = (columnCoord / mTabSize) * mTabSize + mTabSize;
columnIndex++;
}
else
{
char buf[7];
auto d = UTF8CharLength(line[columnIndex].mChar);
int i = 0;
while (i < 6 && d-- > 0)
buf[i++] = line[columnIndex++].mChar;
buf[i] = '\0';
columnWidth = ImGui::GetFont()->CalcTextSizeA(ImGui::GetFontSize(), FLT_MAX, -1.0f, buf).x;
if (mTextStart + columnX + columnWidth * 0.5f > local.x)
break;
columnX += columnWidth;
columnCoord++;
}
}
}
return SanitizeCoordinates(Coordinates(lineNo, columnCoord));
}
TextEditor::Coordinates TextEditor::FindWordStart(const Coordinates & aFrom) const
{
Coordinates at = aFrom;
if (at.mLine >= (int)mLines.size())
return at;
auto& line = mLines[at.mLine];
auto cindex = GetCharacterIndex(at);
if (cindex >= (int)line.size())
return at;
while (cindex > 0 && isspace(line[cindex].mChar))
--cindex;
auto cstart = (PaletteIndex)line[cindex].mColorIndex;
while (cindex > 0)
{
auto c = line[cindex].mChar;
if ((c & 0xC0) != 0x80) // not UTF code sequence 10xxxxxx
{
if (c <= 32 && isspace(c))
{
cindex++;
break;
}
if (cstart != (PaletteIndex)line[size_t(cindex - 1)].mColorIndex)
break;
}
--cindex;
}
return Coordinates(at.mLine, GetCharacterColumn(at.mLine, cindex));
}
TextEditor::Coordinates TextEditor::FindWordEnd(const Coordinates & aFrom) const
{
Coordinates at = aFrom;
if (at.mLine >= (int)mLines.size())
return at;
auto& line = mLines[at.mLine];
auto cindex = GetCharacterIndex(at);
if (cindex >= (int)line.size())
return at;
bool prevspace = (bool)isspace(line[cindex].mChar);
auto cstart = (PaletteIndex)line[cindex].mColorIndex;
while (cindex < (int)line.size())
{
auto c = line[cindex].mChar;
auto d = UTF8CharLength(c);
if (cstart != (PaletteIndex)line[cindex].mColorIndex)
break;
if (prevspace != !!isspace(c))
{
if (isspace(c))
while (cindex < (int)line.size() && isspace(line[cindex].mChar))
++cindex;
break;
}
cindex += d;
}
return Coordinates(aFrom.mLine, GetCharacterColumn(aFrom.mLine, cindex));
}
TextEditor::Coordinates TextEditor::FindNextWord(const Coordinates & aFrom) const
{
Coordinates at = aFrom;
if (at.mLine >= (int)mLines.size())
return at;
// skip to the next non-word character
auto cindex = GetCharacterIndex(aFrom);
bool isword = false;
bool skip = false;
if (cindex < (int)mLines[at.mLine].size())
{
auto& line = mLines[at.mLine];
isword = isalnum(line[cindex].mChar);
skip = isword;
}
while (!isword || skip)
{
if (at.mLine >= mLines.size())
{
auto l = std::max(0, (int) mLines.size() - 1);
return Coordinates(l, GetLineMaxColumn(l));
}
auto& line = mLines[at.mLine];
if (cindex < (int)line.size())
{
isword = isalnum(line[cindex].mChar);
if (isword && !skip)
return Coordinates(at.mLine, GetCharacterColumn(at.mLine, cindex));
if (!isword)
skip = false;
cindex++;
}
else
{
cindex = 0;
++at.mLine;
skip = false;
isword = false;
}
}
return at;
}
int TextEditor::GetCharacterIndex(const Coordinates& aCoordinates) const
{
if (aCoordinates.mLine >= mLines.size())
return -1;
auto& line = mLines[aCoordinates.mLine];
int c = 0;
int i = 0;
for (; i < line.size() && c < aCoordinates.mColumn;)
{
if (line[i].mChar == '\t')
c = (c / mTabSize) * mTabSize + mTabSize;
else
++c;
i += UTF8CharLength(line[i].mChar);
}
return i;
}
int TextEditor::GetCharacterColumn(int aLine, int aIndex) const
{
if (aLine >= mLines.size())
return 0;
auto& line = mLines[aLine];
int col = 0;
int i = 0;
while (i < aIndex && i < (int)line.size())
{
auto c = line[i].mChar;
i += UTF8CharLength(c);
if (c == '\t')
col = (col / mTabSize) * mTabSize + mTabSize;
else
col++;
}
return col;
}
int TextEditor::GetLineCharacterCount(int aLine) const
{
if (aLine >= mLines.size())
return 0;
auto& line = mLines[aLine];
int c = 0;
for (unsigned i = 0; i < line.size(); c++)
i += UTF8CharLength(line[i].mChar);
return c;
}
int TextEditor::GetLineMaxColumn(int aLine) const
{
if (aLine >= mLines.size())
return 0;
auto& line = mLines[aLine];
int col = 0;
for (unsigned i = 0; i < line.size(); )
{
auto c = line[i].mChar;
if (c == '\t')
col = (col / mTabSize) * mTabSize + mTabSize;
else
col++;
i += UTF8CharLength(c);
}
return col;
}
bool TextEditor::IsOnWordBoundary(const Coordinates & aAt) const
{
if (aAt.mLine >= (int)mLines.size() || aAt.mColumn == 0)
return true;
auto& line = mLines[aAt.mLine];
auto cindex = GetCharacterIndex(aAt);
if (cindex >= (int)line.size())
return true;
if (mColorizerEnabled)
return line[cindex].mColorIndex != line[size_t(cindex - 1)].mColorIndex;
return isspace(line[cindex].mChar) != isspace(line[cindex - 1].mChar);
}
void TextEditor::RemoveLine(int aStart, int aEnd)
{
assert(!mReadOnly);
assert(aEnd >= aStart);
assert(mLines.size() > (size_t)(aEnd - aStart));
ErrorMarkers etmp;
for (auto& i : mErrorMarkers)
{
ErrorMarkers::value_type e(i.first >= aStart ? i.first - 1 : i.first, i.second);
if (e.first >= aStart && e.first <= aEnd)
continue;
etmp.insert(e);
}
mErrorMarkers = std::move(etmp);
Breakpoints btmp;
for (auto i : mBreakpoints)
{
if (i >= aStart && i <= aEnd)
continue;
btmp.insert(i >= aStart ? i - 1 : i);
}
mBreakpoints = std::move(btmp);
mLines.erase(mLines.begin() + aStart, mLines.begin() + aEnd);
assert(!mLines.empty());
mTextChanged = true;
}
void TextEditor::RemoveLine(int aIndex)
{
assert(!mReadOnly);
assert(mLines.size() > 1);
ErrorMarkers etmp;
for (auto& i : mErrorMarkers)
{
ErrorMarkers::value_type e(i.first > aIndex ? i.first - 1 : i.first, i.second);
if (e.first - 1 == aIndex)
continue;
etmp.insert(e);
}
mErrorMarkers = std::move(etmp);
Breakpoints btmp;
for (auto i : mBreakpoints)
{
if (i == aIndex)
continue;
btmp.insert(i >= aIndex ? i - 1 : i);
}
mBreakpoints = std::move(btmp);
mLines.erase(mLines.begin() + aIndex);
assert(!mLines.empty());
mTextChanged = true;
}
TextEditor::Line& TextEditor::InsertLine(int aIndex)
{
assert(!mReadOnly);
auto& result = *mLines.insert(mLines.begin() + aIndex, Line());
ErrorMarkers etmp;
for (auto& i : mErrorMarkers)
etmp.insert(ErrorMarkers::value_type(i.first >= aIndex ? i.first + 1 : i.first, i.second));
mErrorMarkers = std::move(etmp);
Breakpoints btmp;
for (auto i : mBreakpoints)
btmp.insert(i >= aIndex ? i + 1 : i);
mBreakpoints = std::move(btmp);
return result;
}
std::string TextEditor::GetWordUnderCursor() const
{
auto c = GetCursorPosition();
return GetWordAt(c);
}
std::string TextEditor::GetWordAt(const Coordinates & aCoords) const
{
auto start = FindWordStart(aCoords);
auto end = FindWordEnd(aCoords);
std::string r;
auto istart = GetCharacterIndex(start);
auto iend = GetCharacterIndex(end);
for (auto it = istart; it < iend; ++it)
r.push_back(mLines[aCoords.mLine][it].mChar);
return r;
}
ImU32 TextEditor::GetGlyphColor(const Glyph & aGlyph) const
{
if (!mColorizerEnabled)
return mPalette[(int)PaletteIndex::Default];
if (aGlyph.mComment)
return mPalette[(int)PaletteIndex::Comment];
if (aGlyph.mMultiLineComment)
return mPalette[(int)PaletteIndex::MultiLineComment];
auto const color = mPalette[(int)aGlyph.mColorIndex];
if (aGlyph.mPreprocessor)
{
const auto ppcolor = mPalette[(int)PaletteIndex::Preprocessor];
const int c0 = ((ppcolor & 0xff) + (color & 0xff)) / 2;
const int c1 = (((ppcolor >> 8) & 0xff) + ((color >> 8) & 0xff)) / 2;
const int c2 = (((ppcolor >> 16) & 0xff) + ((color >> 16) & 0xff)) / 2;
const int c3 = (((ppcolor >> 24) & 0xff) + ((color >> 24) & 0xff)) / 2;
return ImU32(c0 | (c1 << 8) | (c2 << 16) | (c3 << 24));
}
return color;
}
void TextEditor::HandleKeyboardInputs()
{
ImGuiIO& io = ImGui::GetIO();
auto shift = io.KeyShift;
auto ctrl = io.ConfigMacOSXBehaviors ? io.KeySuper : io.KeyCtrl;
auto alt = io.ConfigMacOSXBehaviors ? io.KeyCtrl : io.KeyAlt;
if (ImGui::IsWindowFocused())
{
if (ImGui::IsWindowHovered())
ImGui::SetMouseCursor(ImGuiMouseCursor_TextInput);
//ImGui::CaptureKeyboardFromApp(true);
io.WantCaptureKeyboard = true;
io.WantTextInput = true;
if (!IsReadOnly() && ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_Z ))
Undo();
else if (!IsReadOnly() && !ctrl && !shift && alt && ImGui::IsKeyPressed( ImGuiKey_Backspace ))
Undo();
else if (!IsReadOnly() && ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_Y ))
Redo();
else if (!ctrl && !alt && ImGui::IsKeyPressed( ImGuiKey_UpArrow ))
MoveUp(1, shift);
else if (!ctrl && !alt && ImGui::IsKeyPressed( ImGuiKey_DownArrow ))
MoveDown(1, shift);
else if (!alt && ImGui::IsKeyPressed( ImGuiKey_LeftArrow ))
MoveLeft(1, shift, ctrl);
else if (!alt && ImGui::IsKeyPressed( ImGuiKey_RightArrow ))
MoveRight(1, shift, ctrl);
else if (!alt && ImGui::IsKeyPressed( ImGuiKey_PageUp ))
MoveUp(GetPageSize() - 4, shift);
else if (!alt && ImGui::IsKeyPressed( ImGuiKey_PageDown ))
MoveDown(GetPageSize() - 4, shift);
else if (!alt && ctrl && ImGui::IsKeyPressed( ImGuiKey_Home ))
MoveTop(shift);
else if (ctrl && !alt && ImGui::IsKeyPressed( ImGuiKey_End ))
MoveBottom(shift);
else if (!ctrl && !alt && ImGui::IsKeyPressed( ImGuiKey_Home ))
MoveHome(shift);
else if (!ctrl && !alt && ImGui::IsKeyPressed( ImGuiKey_End ))
MoveEnd(shift);
else if (!IsReadOnly() && !ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_Delete ))
Delete();
else if (!IsReadOnly() && !ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_Backspace ))
Backspace();
else if (!ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_Insert ))
mOverwrite ^= true;
else if (ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_Insert))
Copy();
else if (ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_C ))
Copy();
else if (!IsReadOnly() && !ctrl && shift && !alt && ImGui::IsKeyPressed( ImGuiKey_Insert))
Paste();
else if (!IsReadOnly() && ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_V ))
Paste();
else if (ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_X ))
Cut();
else if (!ctrl && shift && !alt && ImGui::IsKeyPressed( ImGuiKey_Delete ))
Cut();
else if (ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_A ))
SelectAll();
else if (!IsReadOnly() && !ctrl && !shift && !alt && ImGui::IsKeyPressed( ImGuiKey_Enter ))
EnterCharacter('\n', false);
else if (!IsReadOnly() && !ctrl && !alt && ImGui::IsKeyPressed( ImGuiKey_Tab ))
EnterCharacter('\t', shift);
if (!IsReadOnly() && !io.InputQueueCharacters.empty())
{
for (int i = 0; i < io.InputQueueCharacters.Size; i++)
{
auto c = io.InputQueueCharacters[i];
if (c != 0 && (c == '\n' || c >= 32))
EnterCharacter(c, shift);
}
io.InputQueueCharacters.resize(0);
}
}
}
void TextEditor::HandleMouseInputs()
{
ImGuiIO& io = ImGui::GetIO();
auto shift = io.KeyShift;
auto ctrl = io.ConfigMacOSXBehaviors ? io.KeySuper : io.KeyCtrl;
auto alt = io.ConfigMacOSXBehaviors ? io.KeyCtrl : io.KeyAlt;
if (ImGui::IsWindowHovered())
{
if (!shift && !alt)
{
auto click = ImGui::IsMouseClicked(0);
auto doubleClick = ImGui::IsMouseDoubleClicked(0);
auto t = ImGui::GetTime();
auto tripleClick = click && !doubleClick && (mLastClick != -1.0f && (t - mLastClick) < io.MouseDoubleClickTime);
/*
Left mouse button triple click
*/
if (tripleClick)
{
if (!ctrl)
{
mState.mCursorPosition = mInteractiveStart = mInteractiveEnd = ScreenPosToCoordinates(ImGui::GetMousePos());
mSelectionMode = SelectionMode::Line;
SetSelection(mInteractiveStart, mInteractiveEnd, mSelectionMode);
}
mLastClick = -1.0f;
}
/*
Left mouse button double click
*/
else if (doubleClick)
{
if (!ctrl)
{
mState.mCursorPosition = mInteractiveStart = mInteractiveEnd = ScreenPosToCoordinates(ImGui::GetMousePos());
if (mSelectionMode == SelectionMode::Line)
mSelectionMode = SelectionMode::Normal;
else
mSelectionMode = SelectionMode::Word;
SetSelection(mInteractiveStart, mInteractiveEnd, mSelectionMode);
}
mLastClick = (float)ImGui::GetTime();
}
/*
Left mouse button click
*/
else if (click)
{
mState.mCursorPosition = mInteractiveStart = mInteractiveEnd = ScreenPosToCoordinates(ImGui::GetMousePos());
if (ctrl)
mSelectionMode = SelectionMode::Word;
else
mSelectionMode = SelectionMode::Normal;
SetSelection(mInteractiveStart, mInteractiveEnd, mSelectionMode);
mLastClick = (float)ImGui::GetTime();
}
// Mouse left button dragging (=> update selection)
else if (ImGui::IsMouseDragging(0) && ImGui::IsMouseDown(0))
{
io.WantCaptureMouse = true;
mState.mCursorPosition = mInteractiveEnd = ScreenPosToCoordinates(ImGui::GetMousePos());
SetSelection(mInteractiveStart, mInteractiveEnd, mSelectionMode);
}
}
}
}
void TextEditor::Render()
{
/* Compute mCharAdvance regarding to scaled font size (Ctrl + mouse wheel)*/
const float fontSize = ImGui::GetFont()->CalcTextSizeA(ImGui::GetFontSize(), FLT_MAX, -1.0f, "#", nullptr, nullptr).x;
mCharAdvance = ImVec2(fontSize, ImGui::GetTextLineHeightWithSpacing() * mLineSpacing);
/* Update palette with the current alpha from style */
for (int i = 0; i < (int)PaletteIndex::Max; ++i)
{
auto color = ImGui::ColorConvertU32ToFloat4(mPaletteBase[i]);
color.w *= ImGui::GetStyle().Alpha;
mPalette[i] = ImGui::ColorConvertFloat4ToU32(color);
}
assert(mLineBuffer.empty());
auto contentSize = ImGui::GetWindowContentRegionMax();
auto drawList = ImGui::GetWindowDrawList();
float longest(mTextStart);
if (mScrollToTop)
{
mScrollToTop = false;
ImGui::SetScrollY(0.f);
}
ImVec2 cursorScreenPos = ImGui::GetCursorScreenPos();
auto scrollX = ImGui::GetScrollX();
auto scrollY = ImGui::GetScrollY();
auto lineNo = (int)floor(scrollY / mCharAdvance.y);
auto globalLineMax = (int)mLines.size();
auto lineMax = std::max(0, std::min((int)mLines.size() - 1, lineNo + (int)floor((scrollY + contentSize.y) / mCharAdvance.y)));
// Deduce mTextStart by evaluating mLines size (global lineMax) plus two spaces as text width
char buf[16];
snprintf(buf, 16, " %d ", globalLineMax);
mTextStart = ImGui::GetFont()->CalcTextSizeA(ImGui::GetFontSize(), FLT_MAX, -1.0f, buf, nullptr, nullptr).x + mLeftMargin;
if (!mLines.empty())
{
float spaceSize = ImGui::GetFont()->CalcTextSizeA(ImGui::GetFontSize(), FLT_MAX, -1.0f, " ", nullptr, nullptr).x;
while (lineNo <= lineMax)
{
ImVec2 lineStartScreenPos = ImVec2(cursorScreenPos.x, cursorScreenPos.y + lineNo * mCharAdvance.y);
ImVec2 textScreenPos = ImVec2(lineStartScreenPos.x + mTextStart, lineStartScreenPos.y);
auto& line = mLines[lineNo];
longest = std::max(mTextStart + TextDistanceToLineStart(Coordinates(lineNo, GetLineMaxColumn(lineNo))), longest);
auto columnNo = 0;
Coordinates lineStartCoord(lineNo, 0);
Coordinates lineEndCoord(lineNo, GetLineMaxColumn(lineNo));
// Draw selection for the current line
float sstart = -1.0f;
float ssend = -1.0f;
assert(mState.mSelectionStart <= mState.mSelectionEnd);
if (mState.mSelectionStart <= lineEndCoord)
sstart = mState.mSelectionStart > lineStartCoord ? TextDistanceToLineStart(mState.mSelectionStart) : 0.0f;
if (mState.mSelectionEnd > lineStartCoord)
ssend = TextDistanceToLineStart(mState.mSelectionEnd < lineEndCoord ? mState.mSelectionEnd : lineEndCoord);
if (mState.mSelectionEnd.mLine > lineNo)
ssend += mCharAdvance.x;
if (sstart != -1 && ssend != -1 && sstart < ssend)
{
ImVec2 vstart(lineStartScreenPos.x + mTextStart + sstart, lineStartScreenPos.y);
ImVec2 vend(lineStartScreenPos.x + mTextStart + ssend, lineStartScreenPos.y + mCharAdvance.y);
drawList->AddRectFilled(vstart, vend, mPalette[(int)PaletteIndex::Selection]);
}
// Draw breakpoints
auto start = ImVec2(lineStartScreenPos.x + scrollX, lineStartScreenPos.y);
if (mBreakpoints.count(lineNo + 1) != 0)
{
auto end = ImVec2(lineStartScreenPos.x + contentSize.x + 2.0f * scrollX, lineStartScreenPos.y + mCharAdvance.y);
drawList->AddRectFilled(start, end, mPalette[(int)PaletteIndex::Breakpoint]);
}
// Draw error markers
auto errorIt = mErrorMarkers.find(lineNo + 1);
if (errorIt != mErrorMarkers.end())
{
auto end = ImVec2(lineStartScreenPos.x + contentSize.x + 2.0f * scrollX, lineStartScreenPos.y + mCharAdvance.y);
drawList->AddRectFilled(start, end, mPalette[(int)PaletteIndex::ErrorMarker]);
if (ImGui::IsMouseHoveringRect(lineStartScreenPos, end))
{
ImGui::BeginTooltip();
ImGui::PushStyleColor(ImGuiCol_Text, ImVec4(1.0f, 0.2f, 0.2f, 1.0f));
ImGui::Text("Error at line %d:", errorIt->first);
ImGui::PopStyleColor();
ImGui::Separator();
ImGui::PushStyleColor(ImGuiCol_Text, ImVec4(1.0f, 1.0f, 0.2f, 1.0f));
ImGui::Text("%s", errorIt->second.c_str());
ImGui::PopStyleColor();
ImGui::EndTooltip();
}
}
// Draw line number (right aligned)
snprintf(buf, 16, "%d ", lineNo + 1);
auto lineNoWidth = ImGui::GetFont()->CalcTextSizeA(ImGui::GetFontSize(), FLT_MAX, -1.0f, buf, nullptr, nullptr).x;
drawList->AddText(ImVec2(lineStartScreenPos.x + mTextStart - lineNoWidth, lineStartScreenPos.y), mPalette[(int)PaletteIndex::LineNumber], buf);
if (mState.mCursorPosition.mLine == lineNo)
{
auto focused = ImGui::IsWindowFocused();
// Highlight the current line (where the cursor is)
if (!HasSelection())
{
auto end = ImVec2(start.x + contentSize.x + scrollX, start.y + mCharAdvance.y);
drawList->AddRectFilled(start, end, mPalette[(int)(focused ? PaletteIndex::CurrentLineFill : PaletteIndex::CurrentLineFillInactive)]);
drawList->AddRect(start, end, mPalette[(int)PaletteIndex::CurrentLineEdge], 1.0f);
}
// Render the cursor
if (focused)
{
auto timeEnd = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
auto elapsed = timeEnd - mStartTime;
if (elapsed > 400)
{
float width = 1.0f;
auto cindex = GetCharacterIndex(mState.mCursorPosition);
float cx = TextDistanceToLineStart(mState.mCursorPosition);
if (mOverwrite && cindex < (int)line.size())
{
auto c = line[cindex].mChar;
if (c == '\t')
{
auto x = (1.0f + std::floor((1.0f + cx) / (float(mTabSize) * spaceSize))) * (float(mTabSize) * spaceSize);
width = x - cx;
}
else
{
char buf2[2];
buf2[0] = line[cindex].mChar;
buf2[1] = '\0';