将 PyQt4 代码翻译成 PyQt5 并非易事：
- PyQt4 和 PyQt5 分别是 Qt4 和 Qt5 的封装，所以两者都受到那个转换变化的影响，其中一个转换是 Qt4 的 QtGui 子模块被分为 QtGui 和 QtWidgets 子模块Qt5 的。
- 某些类和方法已被弃用，因此您必须找到等效的（如果存在）。
在这种情况下，两种情况都会发生，第一种情况的解决方案很简单：您必须查看 Qt 文档并检查它属于哪个子模块，例如QToolTip，顶部有一个表格：
观察QT += widgets中属于QtWidgets子模块的部分。
但第二种情况稍微复杂一些，因为它涉及寻找可能在或不在同一类中的等价物，在这种情况下，它发生在已弃用的 QPixmap.grabWindow() 方法上（see here 了解更多信息）。进行搜索后，您可以将该代码替换为 QApplication.primaryScreen().grabWindow(0)。
综合以上，翻译为：
import sys
from PyQt5.QtCore import QRectF, Qt
from PyQt5.QtGui import QColor, QFont, QPainter, QPixmap, QTextOption, QScreen
from PyQt5.QtWidgets import QApplication, QToolTip, QWidget
class AreaSelector(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, None, Qt.FramelessWindowHint)
self.setAttribute(Qt.WA_TranslucentBackground)
self.setAttribute(Qt.WA_DeleteOnClose)
self.setWindowState(Qt.WindowFullScreen)
self.setAutoFillBackground(False)
self.parent = parent
self.start_x = 0
self.start_y = 0
self.end_x = 0
self.end_y = 0
self.current_x = 0
self.current_y = 0
def showEvent(self, event):
self.bg = QApplication.primaryScreen().grabWindow(0)
self.screen_geometry = QApplication.primaryScreen().geometry()
def mousePressEvent(self, event):
self.start_x = event.globalX()
self.start_y = event.globalY()
def mouseReleaseEvent(self, event):
self.end_x = event.globalX()
self.end_y = event.globalY()
def mouseMoveEvent(self, event):
self.current_x = event.globalX()
self.current_y = event.globalY()
self.repaint()
text = "Start: %sx%s \nEnd: %sx%s" % (
self.start_x,
self.start_y,
self.current_x,
self.current_y,
)
QToolTip.showText(event.pos(), text)
def keyPressEvent(self, event):
if event.key() == Qt.Key_Return:
self._acceptSelection()
elif event.key() == Qt.Key_Escape:
self.close()
def _acceptSelection(self):
if self.parent is not None:
self.parent.areaSelectEvent(
self.start_x, self.start_y, self.end_x, self.end_y
)
self.close()
def paintEvent(self, event):
painter = QPainter()
painter.begin(self)
painter.fillRect(self.screen_geometry, QColor(10, 10, 10, 125))
self._paint_selection(painter)
self._paint_usage_text(painter)
painter.end()
def _paint_usage_text(self, painter):
font = QFont("Helvetica [Cronyx]", 26, QFont.Bold)
painter.setFont(font)
painter.setPen(QColor(255, 255, 255, 255))
screen_width = self.screen_geometry.width()
text_width = 800
text_start_x = screen_width / 2 - text_width / 2
screen_height = self.screen_geometry.height()
text_height = 200
text_start_y = screen_height / 2 - text_height / 2
textoption = QTextOption(Qt.AlignCenter)
textbox = QRectF(text_start_x, text_start_y, text_width, text_height)
painter.drawText(
textbox,
"Click & Drag to select an area\n" "ENTER to confirm or ESC to cancel",
textoption,
)
painter.drawRoundedRect(textbox, 20, 20)
def _paint_selection(self, painter):
"""Draws the current user selection"""
rectangle = QRectF()
if self.start_x > self.current_x:
rectangle.setLeft(self.current_x)
rectangle.setRight(self.start_x)
else:
rectangle.setLeft(self.start_x)
rectangle.setRight(self.current_x)
if self.start_y > self.current_y:
rectangle.setTop(self.current_y)
rectangle.setBottom(self.start_y)
else:
rectangle.setTop(self.start_y)
rectangle.setBottom(self.current_y)
painter.drawPixmap(rectangle, self.bg, rectangle)
painter.drawRect(rectangle)
if __name__ == "__main__":
app = QApplication(sys.argv)
main = AreaSelector()
main.show()
sys.exit(app.exec_())