def paintEvent(self, event):
contents_y = self.edit.verticalScrollBar().value()
page_bottom = contents_y + self.edit.viewport().height()
font_metrics = self.fontMetrics()
current_block = self.edit.document().findBlock(
self.edit.textCursor().position())
painter = QPainter(self)
first_line = self.edit.firstVisibleBlock().firstLineNumber()
# print(self.highest_line.data())
line_count = 0
# Iterate over all text blocks in the document.
block = self.edit.document().begin()
while block.isValid():
line_count += 1
# The top left position of the block in the document
position = self.edit.document().documentLayout().blockBoundingRect(
block).topLeft()
# Check if the position of the block is out side of the visible
# area.
if position.y() > page_bottom:
break
# We want the line number for the selected line to be bold.
bold = False
if block == current_block:
bold = True
font = painter.font()
font.setBold(True)
painter.setFont(font)
# Draw the line number right justified at the y position of the
# line. 3 is a magic padding number. drawText(x, y, text).
font = QFont()
font.setPointSize(self.edit.font().pointSize())
font.setWordSpacing(20)
painter.setFont(font)
if line_count == 1:
painter.drawText(
self.width() -
font_metrics.width(str(line_count + first_line)) - 3,
1 + 17 * line_count, str(first_line + line_count))
else:
painter.drawText(
self.width() -
font_metrics.width(str(line_count + first_line)) - 3,
1 + 17 * line_count +
(self.edit.font().pointSize() - 10) * line_count * 2,
str(first_line + line_count))
#print(self.width() - font_metrics.width(str(line_count)) - 3 , " " , round(position.y()) - contents_y + font_metrics.ascent(), str(line_count))
# Remove the bold style if it was set previously.
if bold:
font = painter.font()
font.setBold(False)
painter.setFont(font)
block = block.next()
self.highest_line = line_count
painter.end()
QWidget.paintEvent(self, event)
