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python - 在 PyQt 中创建带有行号的文本区域(textEdit)

转载 作者:太空宇宙 更新时间:2023-11-03 13:35:36 26 4
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我想在 PyQt 中像 Notepad++ 一样在左侧创建带有行号的文本编辑器。我尝试添加另一个 textEdit 但滚动卡住了。我搜索并找到了这个 question ,但是没有很好的解决办法。

最佳答案

这就是你要找的CodeEditor example in pyqt基于 C++ http://doc.qt.io/qt-5/qtwidgets-widgets-codeeditor-example.html

将它放在一起用于 python3(我使用的是 PyQt4 而不是 5,但我想它是相似的)(并且使用 QPlainTextEdit 而不是 QTextEdit 参见 QTextEdit vs QPlainTextEdit ):

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *

import numpy as np

class LineNumberArea(QWidget):


def __init__(self, editor):
super().__init__(editor)
self.myeditor = editor


def sizeHint(self):
return Qsize(self.editor.lineNumberAreaWidth(), 0)


def paintEvent(self, event):
self.myeditor.lineNumberAreaPaintEvent(event)


class CodeEditor(QPlainTextEdit):
def __init__(self):
super().__init__()
self.lineNumberArea = LineNumberArea(self)

self.connect(self, SIGNAL('blockCountChanged(int)'), self.updateLineNumberAreaWidth)
self.connect(self, SIGNAL('updateRequest(QRect,int)'), self.updateLineNumberArea)
self.connect(self, SIGNAL('cursorPositionChanged()'), self.highlightCurrentLine)

self.updateLineNumberAreaWidth(0)


def lineNumberAreaWidth(self):
digits = 1
count = max(1, self.blockCount())
while count >= 10:
count /= 10
digits += 1
space = 3 + self.fontMetrics().width('9') * digits
return space


def updateLineNumberAreaWidth(self, _):
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.lineNumberArea.width(),
rect.height())

if rect.contains(self.viewport().rect()):
self.updateLineNumberAreaWidth(0)


def resizeEvent(self, event):
super().resizeEvent(event)

cr = self.contentsRect();
self.lineNumberArea.setGeometry(QRect(cr.left(), cr.top(),
self.lineNumberAreaWidth(), cr.height()))


def lineNumberAreaPaintEvent(self, event):
mypainter = QPainter(self.lineNumberArea)

mypainter.fillRect(event.rect(), Qt.lightGray)

block = self.firstVisibleBlock()
blockNumber = block.blockNumber()
top = self.blockBoundingGeometry(block).translated(self.contentOffset()).top()
bottom = top + self.blockBoundingRect(block).height()

# Just to make sure I use the right font
height = self.fontMetrics().height()
while block.isValid() and (top <= event.rect().bottom()):
if block.isVisible() and (bottom >= event.rect().top()):
number = str(blockNumber + 1)
mypainter.setPen(Qt.black)
mypainter.drawText(0, top, self.lineNumberArea.width(), height,
Qt.AlignRight, number)

block = block.next()
top = bottom
bottom = top + self.blockBoundingRect(block).height()
blockNumber += 1


def highlightCurrentLine(self):
extraSelections = []

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)


if __name__ == "__main__":
app = QApplication(sys.argv)

txt = CodeEditor()
txt.show()

sys.exit(app.exec_())

关于python - 在 PyQt 中创建带有行号的文本区域(textEdit),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40386194/

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