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A custom widget has been created to tailor the behavior of QPlainTextEdit to our needs. The new widget, which inherits from it, adds on top: - Current line and error highlighting - Line numbers with customizable offset The previous notification widget has been further integrated onto the program, and now the snippet honors the selected font size and source line numbering.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| from PySide2 import QtWidgets, QtGui, QtCore | ||
| from math import log10, ceil | ||
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| class CodeEdit(QtWidgets.QPlainTextEdit): | ||
| class LineNumberArea(QtWidgets.QWidget): | ||
| def __init__(self, *args, **kwargs): | ||
| super().__init__(*args, **kwargs) | ||
| self._offset = 1 | ||
| self._count = 0 | ||
| self._fontScale = 0.8 | ||
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| def sizeHint(self): | ||
| lastLine = self._offset + self._count | ||
| digits = ceil(log10(lastLine)) | ||
| metrics = QtGui.QFontMetrics(self.font()) | ||
| margins = self.contentsMargins() | ||
| width = margins.left() + margins.right() + metrics.horizontalAdvance('9' * digits) | ||
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| return QtCore.QSize(width, -1) | ||
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| def paintEvent(self, event): | ||
| parent = self.parentWidget() | ||
| painter = QtGui.QPainter(self) | ||
| background = self.palette().color(QtGui.QPalette.Background) | ||
| foreground = self.palette().color(QtGui.QPalette.Foreground) | ||
| painter.fillRect(event.rect(), background) | ||
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| block = parent.firstVisibleBlock() | ||
| number = block.blockNumber() + self.offset() | ||
| top = parent.blockBoundingGeometry(block).translated(parent.contentOffset()).top() | ||
| bottom = top + parent.blockBoundingRect(block).height() | ||
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| font = parent.font() | ||
| font.setPointSizeF(font.pointSizeF() * self._fontScale) | ||
| painter.setFont(font) | ||
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| while block.isValid() and top <= event.rect().bottom(): | ||
| if block.isVisible() and bottom >= event.rect().top(): | ||
| width = self.sizeHint().width() | ||
| height = parent.fontMetrics().height() | ||
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| painter.setPen(foreground) | ||
| painter.drawText(0, top + height * ((1 - self._fontScale) / 2), | ||
| width - self.contentsMargins().right(), height, | ||
| QtGui.Qt.AlignRight, str(number)) | ||
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| block = block.next() | ||
| top = bottom | ||
| bottom = top + parent.blockBoundingRect(block).height() | ||
| number += 1 | ||
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| painter.end() | ||
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| def count(self): | ||
| return self._count | ||
|
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| def setCount(self, count): | ||
| self._count = count | ||
|
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| def offset(self): | ||
| return self._offset | ||
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| def setOffset(self, offset): | ||
| self._offset = offset | ||
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| def fontScale(self): | ||
| return self._fontScale | ||
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| def setFontScale(self, fontScale): | ||
| self._fontScale = fontScale | ||
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| def __init__(self, *args, **kwargs): | ||
| super().__init__(*args, *kwargs) | ||
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| self.lineNumbers = CodeEdit.LineNumberArea(self) | ||
| self.lineNumbers.setContentsMargins(QtCore.QMargins(4, 0, 4, 0)) | ||
| p = self.palette() | ||
| self.lineNumbers.setPalette(p) | ||
| self.textChanged.connect(self.updateLineCount) | ||
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| self.blockCountChanged.connect(self.updateLineCount) | ||
| self.updateRequest.connect(self.updateLineNumbers) | ||
| self.cursorPositionChanged.connect(self.highlightCurrentLine) | ||
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| self.errorSels = [] | ||
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| self.lineSel = QtWidgets.QTextEdit.ExtraSelection() | ||
| self.lineSel.format.setBackground(QtGui.QColor(255, 255, 0, 16)) | ||
| self.lineSel.format.setProperty(QtGui.QTextFormat.FullWidthSelection, True) | ||
| self.lineSel.cursor = self.textCursor() | ||
| self.lineSel.cursor.clearSelection() | ||
| self.updateSelections() | ||
|
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| def offset(self): | ||
| return self.lineNumbers.offset() | ||
|
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| def setOffset(self, offset): | ||
| self.lineNumbers.setOffset(offset) | ||
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| def updateLineCount(self): | ||
| self.lineNumbers.setCount(self.document().blockCount()) | ||
| self.setViewportMargins(self.lineNumbers.sizeHint().width(), 0, 0, 0) | ||
|
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| def updateLineNumbers(self, rect, dy): | ||
| if dy: | ||
| self.lineNumbers.scroll(0, dy) | ||
| else: | ||
| size = self.lineNumbers.sizeHint() | ||
| self.lineNumbers.update(0, rect.y(), size.width(), rect.height()) | ||
|
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| if rect.contains(self.viewport().rect()): | ||
| self.updateLineCount() | ||
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| def highlightCurrentLine(self): | ||
| if not self.isReadOnly(): | ||
| self.lineSel.cursor = self.textCursor() | ||
| self.lineSel.cursor.clearSelection() | ||
|
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| self.updateSelections() | ||
|
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| def clearErrorHighlight(self): | ||
| self.errorSels = [] | ||
| self.updateSelections() | ||
|
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| def addErrorHighlight(self, start, end): | ||
| errorSel = QtWidgets.QTextEdit.ExtraSelection() | ||
| errorSel.format.setBackground(QtGui.QColor(255, 0, 0, 16)) | ||
| errorSel.format.setProperty(QtGui.QTextFormat.TextUnderlineColor, QtGui.QColor(255, 0, 0)) | ||
| errorSel.format.setProperty(QtGui.QTextFormat.TextUnderlineStyle, QtGui.QTextCharFormat.UnderlineStyle.SpellCheckUnderline) | ||
| errorSel.cursor = QtGui.QTextCursor(self.document()) | ||
| errorSel.cursor.setPosition(start) | ||
| errorSel.cursor.setPosition(end, QtGui.QTextCursor.KeepAnchor) | ||
| self.errorSels.append(errorSel) | ||
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| self.updateSelections() | ||
|
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| def updateSelections(self): | ||
| selections = self.errorSels.copy() | ||
|
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| if not self.isReadOnly(): | ||
| selections.append(self.lineSel) | ||
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| self.setExtraSelections(selections) | ||
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| def setFont(self, font): | ||
| super().setFont(font) | ||
| self.lineNumbers.setFont(font) | ||
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| def setReadOnly(self, ro): | ||
| super().setReadOnly(ro) | ||
| self.updateSelections() | ||
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| def resizeEvent(self, event): | ||
| super().resizeEvent(event) | ||
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| cr = self.contentsRect() | ||
| width = self.lineNumbers.sizeHint().width() | ||
| self.lineNumbers.setGeometry(QtCore.QRect(cr.left(), cr.top(), width, cr.height())) |
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