LNTextEdit.py 文件源码

def numberbarPaint(self, number_bar, event):
            font_metrics = self.fontMetrics()
            current_line = self.document().findBlock(self.textCursor().position()).blockNumber() + 1

            block = self.firstVisibleBlock()
            line_count = block.blockNumber()
            painter = QtGui.QPainter(number_bar)
            painter.fillRect(event.rect(), self.palette().base())

            # Iterate over all visible text blocks in the document.
            while block.isValid():
                line_count += 1
                block_top = self.blockBoundingGeometry(block).translated(self.contentOffset()).top()

                # Check if the position of the block is out side of the visible
                # area.
                if not block.isVisible() or block_top >= event.rect().bottom():
                    break

                # We want the line number for the selected line to be bold.
                if line_count == current_line:
                    font = painter.font()
                    font.setBold(True)
                    painter.setFont(font)
                else:
                    font = painter.font()
                    font.setBold(False)
                    painter.setFont(font)

                # Draw the line number right justified at the position of the line.
                paint_rect = QtCore.QRect(0, block_top, number_bar.width(), font_metrics.height())
                painter.drawText(paint_rect, QtCore.Qt.AlignRight, unicode(line_count))

                block = block.next()

            painter.end()