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)
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).
#
painter.drawText(self.width() - len(str(line_count)) * font_metrics.averageCharWidth() - 5,
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)
def paintEvent(self, ev):
painter = QPainter(self)
painter.setRenderHint(QPainter.RenderHint.TextAntialiasing)
f = painter.font()
f.setBold(True)
f.setPixelSize(self.height() - 1)
painter.setFont(f)
painter.setPen(QColor('red' if self.is_enabled else 'green'))
painter.drawText(self.rect(), Qt.AlignmentFlag.AlignCenter, 'Z')
painter.end()