Reload paintEvent to draw rect but QLabel can't display pixmap or text
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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.
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@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?
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@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? -
Hi,
Like in C++, you have to call the base class paintEvent first if you want to draw on top of it later.
