python - 我怎样才能在 pyside QWidget 中有一个透明的背景，但保持它的 child 不透明

Question

我有一个包含很多子项的小部件，我想将其背景设置为透明，但让其子项不透明。

我正在使用 PySide 1.2.1 win7

我尝试过这样的事情:

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self.setAttribute(Qt.WA_TranslucentBackground,True);

---

self.setStyleSheet("背景色:rgba(40,40,150,150);边框:0px;")

---

但它对我不起作用。它使整个小部件透明。我想让 children 不透明。有人能帮我吗 ？太感谢了。这是我的代码，感谢您的帮助。

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import sys
from PySide.QtCore import *
from PySide.QtGui import *

class M_SCROLL_GRID_WIDGET(QWidget):
    # This is a common ui class .
    def __init__(self,column_count):
        super(M_SCROLL_GRID_WIDGET, self).__init__()

        self.column_count = column_count

        self.visible_widget_list = []

        self.scroll_widget = QWidget()

        self.scroll_area = QScrollArea()
        self.scroll_area.setVerticalScrollBarPolicy(Qt.ScrollBarAsNeeded)
        self.scroll_area.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
        self.scroll_area.setWidgetResizable(True)
        self.scroll_area.setWidget(self.scroll_widget)

        self.main_layout = QGridLayout()

        self.main_layout.setSpacing(0)

        self.scroll_widget.setLayout(self.main_layout)
        self.main_layout.setAlignment(Qt.AlignTop)
        master_layout = QVBoxLayout(self)
        master_layout.addWidget(self.scroll_area)

        self.setLayout(master_layout)

        self.setAttribute(Qt.WA_TranslucentBackground, True)
        self.setStyleSheet("background-color:rgba(40,40,150,150);border:0px;")


    def Get_Widget_Count(self):
        return len(self.visible_widget_list)


    def Add_Widget_To_Vis_List(self, widget):
        self.visible_widget_list.append(widget)


    def Remove_Widget_To_Vis_List(self, widget):
        self.visible_widget_list.remove(widget)


    def Remove_All_Widgets(self):
        for i in reversed(range(self.main_layout.count())):
            widget = self.main_layout.itemAt(i).widget()
            widget.setParent(None)


    def Clean_Visible_List(self):
        self.visible_widget_list = []


    def Refresh(self):

        for widget_index in xrange(len(self.visible_widget_list)):
            r_position =  widget_index      / self.column_count
            c_position = (widget_index + 1) % self.column_count
            if c_position == 0:
                c_position = self.column_count
                         self.main_layout.addWidget(self.visible_widget_list[widget_index], r_position, c_position)

if __name__ == '__main__':

    app = QApplication(sys.argv)

    caofan = M_SCROLL_GRID_WIDGET(3)

    btn_list = []

    caofan.Remove_All_Widgets()
    for a in xrange(50):
        btn = QPushButton(str(a+1))
        btn_list.append(btn)
        caofan.Add_Widget_To_Vis_List(btn)

    caofan.Refresh()

    caofan.show()

    app.exec_()

Answer 1

我怀疑真正的问题是您指定的样式表正在传播到子部件。

所以，删除...

self.setStyleSheet("background-color:rgba(40,40,150,150);border:0px;")

并用类似...的东西覆盖QWidget::paintEvent

def paintEvent(self, event):
    painter = QPainter(self)
    painter.fillRect(self.rect(), QColor(40, 40, 150, 150))