Reload paintEvent to draw rect but QLabel can't display pixmap or text

[klyjm]

I want to draw a rectangle on a picture displayed in a QLabel, so I reload the paintEvent of QLabel. I find that the rect can be display, but the pixmap or text can't. I have add arg__1 in reloaded paintEvent, but it is no use. How to solve it?

        class ImageLabel(QLabel):

            def __init__(self, parent: MainWindow):
                super().__init__()
                self.rect_1_point = QPoint(0, 0)
                self.rect_2_point = QPoint(0, 0)
                self.rect_1_x = 0
                self.rect_1_y = 0
                self.rect_2_x = 0
                self.rect_2_y = 0
                self.press_flag = False
                self.painted_flag = False
                self.main_window = parent

            def mouseMoveEvent(self, ev: QMouseEvent):
                if self.press_flag and self.press_flag:
                    self.rect_2_x = ev.x() - self.x()
                    self.rect_2_y = ev.y() - self.y()
                    self.rect_2_point = ev.pos()
                    self.update()

            def mousePressEvent(self, ev: QMouseEvent):
                if ev.button() == Qt.LeftButton and self.pixmap() is not None:
                    self.rect_1_x = ev.x() - self.x()
                    self.rect_1_y = ev.y() - self.y()
                    self.rect_1_point = ev.pos()
                    self.rect_2_point = ev.pos()
                    self.press_flag = True

            def mouseReleaseEvent(self, ev: QMouseEvent):
                if self.press_flag:
                    self.rect_2_x = ev.x() - self.x()
                    self.rect_2_y = ev.y() - self.y()
                    self.rect_2_point = ev.pos()
                    # self.press_flag = False

            def paintEvent(self, arg__1: QPaintEvent):
                arg__1
                if self.press_flag and not self.rect_1_point == self.rect_2_point:
                    rect_painter = QPainter(self)
                    pen = QPen()
                    pen.setColor(QColor(Qt.red))
                    rect_painter.setPen(pen)
                    pen.setWidth(1)
                    rect_painter.drawRect(QRect(self.rect_1_point, self.rect_2_point))

If I use arg__1(), there will be an error. I don't know how to solve it.

[jsulm]

@klyjm said in Reload paintEvent to draw rect but QLabel can't display pixmap or text:

but the pixmap or text can't.

Can you show how you paint those?

[klyjm]

@jsulm I don't paint them, I just use setPixmap() and setText() to show them. When override paintEvent in C++, painting rectangle and showing text or pixmap can be in the same time by use QLabel::paintEvent(event). But I find in PySide2, I can't show the pixmap or text. Do you know how to do it?

[SGaist]

Hi,

Like in C++, you have to call the base class paintEvent first if you want to draw on top of it later.

[klyjm]

@SGaist I don't know how to call it before, now I found using super().paintEvent(arg__1) can solve it.