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from PyQt5.QtCore import QRegularExpression, Qt, QSize
from PyQt5.QtGui import (
QColor, QFont, QPainter, QSyntaxHighlighter, QTextCursor)
from PyQt5.QtWidgets import QPlainTextEdit, QWidget
# maybe add closeEvent
class LineNumberArea(QWidget):
def __init__(self, editor):
super(LineNumberArea, self).__init__(editor)
def sizeHint(self):
return QSize(self.parent().lineNumberAreaWidth(), 0)
def paintEvent(self, event):
self.parent().lineNumberAreaPaintEvent(event)
class CodeEditor(QPlainTextEdit):
def __init__(self, text=None, parent=None):
super(CodeEditor, self).__init__(parent)
# https://gist.github.com/murphyrandle/2921575
font = QFont('Roboto Mono', 10)
font.setFixedPitch(True)
self.setFont(font)
self.indent = " "
self.openBlockDelimiter = None
self.lineNumbers = LineNumberArea(self)
self.setPlainText(text)
# kick-in geometry update before arming signals bc blockCountChanged
# won't initially trigger if text is None or one-liner.
self.updateLineNumberAreaWidth()
self.blockCountChanged.connect(self.updateLineNumberAreaWidth)
self.updateRequest.connect(self.updateLineNumberArea)
def lineNumberAreaPaintEvent(self, event):
painter = QPainter(self.lineNumbers)
painter.fillRect(event.rect(), QColor(230, 230, 230))
d = event.rect().topRight()
a = event.rect().bottomRight()
painter.setPen(Qt.darkGray)
painter.drawLine(d.x(), d.y(), a.x(), a.y())
painter.setPen(QColor(100, 100, 100))
painter.setFont(self.font())
block = self.firstVisibleBlock()
blockNumber = block.blockNumber()
top = int(
self.blockBoundingGeometry(block).translated(
self.contentOffset()).top())
bottom = top + int(self.blockBoundingRect(block).height())
while block.isValid() and top <= event.rect().bottom():
if block.isVisible() and bottom >= event.rect().top():
number = str(blockNumber + 1)
painter.drawText(4, top, self.lineNumbers.width() - 8,
self.fontMetrics().height(), Qt.AlignRight,
number)
block = block.next()
top = bottom
bottom = top + int(self.blockBoundingRect(block).height())
blockNumber += 1
def lineNumberAreaWidth(self):
digits = 1
top = max(1, self.blockCount())
while top >= 10:
top /= 10
digits += 1
# Avoid too frequent geometry changes
if digits < 3:
digits = 3
return 10 + self.fontMetrics().width('9') * digits
def updateLineNumberArea(self, rect, dy):
if dy:
self.lineNumbers.scroll(0, dy)
else:
self.lineNumbers.update(0, rect.y(), self.lineNumbers.width(),
rect.height())
if rect.contains(self.viewport().rect()):
self.updateLineNumberAreaWidth(0)
def updateLineNumberAreaWidth(self, newBlockCount=None):
self.setViewportMargins(self.lineNumberAreaWidth(), 0, 0, 0)
def resizeEvent(self, event):
super(CodeEditor, self).resizeEvent(event)
cr = self.contentsRect()
self.lineNumbers.setGeometry(cr.left(), cr.top(),
self.lineNumberAreaWidth(), cr.height())
def findLineIndentLevel(self, cursor):
indent = 0
cursor.select(QTextCursor.LineUnderCursor)
lineLength = len(cursor.selectedText()) // len(self.indent)
cursor.movePosition(QTextCursor.StartOfLine)
while lineLength > 0:
cursor.movePosition(QTextCursor.NextCharacter,
QTextCursor.KeepAnchor, len(self.indent))
if cursor.selectedText() == self.indent:
indent += 1
else:
break
# Now move the anchor back to the position()
# shouldn't NoMove work here?
# cursor.movePosition(QTextCursor.NoMove)
cursor.setPosition(cursor.position())
lineLength -= 1
cursor.movePosition(QTextCursor.EndOfLine)
return indent
def keyPressEvent(self, event):
key = event.key()
if key == Qt.Key_Return:
cursor = self.textCursor()
indentLvl = self.findLineIndentLevel(cursor)
if self.openBlockDelimiter is not None:
cursor.movePosition(QTextCursor.PreviousCharacter,
QTextCursor.KeepAnchor)
if cursor.selectedText() == self.openBlockDelimiter:
indentLvl += 1
super(CodeEditor, self).keyPressEvent(event)
newLineSpace = "".join(self.indent for _ in range(indentLvl))
cursor = self.textCursor()
cursor.insertText(newLineSpace)
elif key == Qt.Key_Tab:
cursor = self.textCursor()
cursor.insertText(self.indent)
elif key == Qt.Key_Backspace:
cursor = self.textCursor()
cursor.movePosition(QTextCursor.PreviousCharacter,
QTextCursor.KeepAnchor,
len(self.indent))
if cursor.selectedText() == self.indent:
cursor.removeSelectedText()
else:
super(CodeEditor, self).keyPressEvent(event)
else:
super(CodeEditor, self).keyPressEvent(event)
def wheelEvent(self, event):
if event.modifiers() & Qt.ControlModifier:
font = self.font()
newPointSize = font.pointSize() + event.angleDelta().y() / 120.0
event.accept()
if newPointSize < 6:
return
font.setPointSize(newPointSize)
self.setFont(font)
else:
super(CodeEditor, self).wheelEvent(event)
class CodeHighlighter(QSyntaxHighlighter):
def __init__(self, parent=None):
super(CodeHighlighter, self).__init__(parent)
self.highlightingRules = []
def highlightBlock(self, text):
for pattern, fmt in self.highlightingRules:
regex = QRegularExpression(pattern)
i = regex.globalMatch(text)
while i.hasNext():
match = i.next()
start = match.capturedStart()
length = match.capturedLength()
self.setFormat(start, length, fmt)
self.setCurrentBlockState(0)
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