#!/usr/bin/python
# -*- coding: utf-8 -*-
import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
from highlighter import MyHighlighter
from highlighter import HighlightingRule
class CodeEditor(QPlainTextEdit):
def __init__(self, parent = None):
QPlainTextEdit.__init__(self, parent)
self.lineNumberArea = LineNumberArea(self)
self.connect(self, SIGNAL('blockCountChanged(int)'), \
self.updateLineNumberAreaWidth)
self.connect(self, SIGNAL('updateRequest(const QRect &, int)'), \
self.updateLineNumberArea)
self.connect(self, SIGNAL('cursorPositionChanged()'), \
self.highlightCurrentLine)
self.updateLineNumberAreaWidth(0)
self.highlightCurrentLine()
def highlightCurrentLine(self):
extraSelections = QTextEdit.extraSelections(QTextEdit())
if not self.isReadOnly():
selection = QTextEdit.ExtraSelection()
lineColor = QColor(Qt.yellow).lighter(160)
selection.format.setBackground(lineColor)
selection.format.setProperty(QTextFormat.FullWidthSelection, True)
selection.cursor = self.textCursor()
selection.cursor.clearSelection()
extraSelections.append(selection)
self.setExtraSelections(extraSelections)
def lineNumberAreaWidth(self):
digits = 1
Max = max(1, self.blockCount())
while (Max >= 10) :
Max /= 10
digits += 1
space = 3 + self.fontMetrics().width('9') * digits
return space
def updateLineNumberAreaWidth(self, newBlockCount):
self.setViewportMargins(self.lineNumberAreaWidth(), 0, 0, 0)
def updateLineNumberArea(self, rect, dy):
if dy:
self.lineNumberArea.scroll(0, dy)
else:
self.lineNumberArea.update(0, rect.y(), \
self.lineNumberAreaWidth(), \
rect.height())
if (rect.contains(self.viewport().rect())):
self.updateLineNumberAreaWidth(0)
def resizeEvent(self, e):
QPlainTextEdit.resizeEvent(self, e)
cr = self.contentsRect()
self.lineNumberArea.setGeometry(QRect(cr.left(), cr.top(), \
self.lineNumberAreaWidth(), \
cr.height()))
def lineNumberAreaPaintEvent(self, event):
painter = QPainter(self.lineNumberArea)
rect = event.rect()
painter.fillRect(rect, Qt.lightGray)
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 <= rect.bottom()):
if (block.isVisible() and bottom >= rect.top()):
number = QString.number(blockNumber + 1)
painter.setPen(Qt.black)
painter.drawText(0, top, self.lineNumberArea.width(), \
self.fontMetrics().height(), \
Qt.AlignRight, number)
block = block.next()
top = bottom
bottom = top + int(self.blockBoundingRect(block).height())
blockNumber += 1
class LineNumberArea(QWidget):
def __init__(self, editor):
QWidget.__init__(self, editor)
self.codeEditor = editor
def sizeHint(self):
return QSize(codeEditor.lineNumberAreaWidth(), 0)
def paintEvent(self, event):
self.codeEditor.lineNumberAreaPaintEvent(event)
def main():
app = QApplication(sys.argv)
editor = CodeEditor()
editor.setWindowTitle('Code Editor Example')
editor.show()
app.exec_()
if __name__ == '__main__':
main()
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