blocks|key|4605485|text|在C%2B%2B对我很管用。我在包含名为titleLabel的QLabel对象的QDialog中执行了以下操作。我在Windows+XP计算机上使用Qt+4.8.4。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4605486|QGraphicsDropShadowEffect*+eff+=+new+QGraphicsDropShadowEffect(this);
eff->setBlurRadius(5);
titleLabel->setGraphicsEffect(eff);|code-block|syntax|javascript|4605487|entityMap^0|G|A|R|6|10|7|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

Works for me in C++. I did the following in a <code>QDialog</code> containing a <code>QLabel</code> object named <code>titleLabel</code>. I'm using Qt 4.8.4 on a Windows XP computer.

<pre><code>QGraphicsDropShadowEffect* eff = new QGraphicsDropShadowEffect(this);
eff-&gt;setBlurRadius(5);
titleLabel-&gt;setGraphicsEffect(eff);
</code></pre>

blocks|key|4605548|text|看看这对你是否有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4605549|#!/usr/bin/env+python
#-*-+coding:utf-8+-*-

import+sip
sip.setapi('QString',+2)
sip.setapi('QVariant',+2)

from+PyQt4.QtCore+import+*
from+PyQt4.QtGui+import+*

class+testShadow(QWidget):
++++def+__init__(self,+parent=None):
++++++++super(testShadow,+self).__init__(parent)

++++++++self.resize(94,+35)
++++++++self.verticalLayout+=+QVBoxLayout(self)
++++++++self.verticalLayout.setObjectName("verticalLayout")
++++++++self.label+=+QLabel(self)
++++++++self.label.setText("Text+Label")

++++++++self.shadow+=+QGraphicsDropShadowEffect(self)
++++++++self.shadow.setBlurRadius(5)
++++++++self.label.setGraphicsEffect(self.shadow)

++++++++self.verticalLayout.addWidget(self.label)

if+__name__+==+"__main__":
++++import++sys

++++app+=+QApplication(sys.argv)
++++main+=+testShadow()
++++main.show()
++++sys.exit(app.exec_())|code-block|syntax|javascript|4605550|​|4605551|📷|atomic|offset|length|4605552|4605553|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/c8b3907d69980398dff3598477711c43.png|imageAlt^0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|10|8|@]|9|@$L|11|M|12|1|13]]|A|$]]|$1|N|3|H|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V|W|-4]]]]

See if this works for you:

<pre><code>#!/usr/bin/env python
#-*- coding:utf-8 -*-

import sip
sip.setapi('QString', 2)
sip.setapi('QVariant', 2)

from PyQt4.QtCore import *
from PyQt4.QtGui import *

class testShadow(QWidget):
 def __init__(self, parent=None):
 super(testShadow, self).__init__(parent)

 self.resize(94, 35)
 self.verticalLayout = QVBoxLayout(self)
 self.verticalLayout.setObjectName("verticalLayout")
 self.label = QLabel(self)
 self.label.setText("Text Label")

 self.shadow = QGraphicsDropShadowEffect(self)
 self.shadow.setBlurRadius(5)
 self.label.setGraphicsEffect(self.shadow)

 self.verticalLayout.addWidget(self.label)

if __name__ == "__main__":
 import sys

 app = QApplication(sys.argv)
 main = testShadow()
 main.show()
 sys.exit(app.exec_())
</code></pre>

<img src="https://i.imgur.com/GEasC.png" alt="image">

blocks|key|4123380|text|我只尝试过在QGraphicsScene环境中使用它(并成功地使用了它)。这对我来说很有效，而试图在普通的QWidget上设置它实际上会导致整个应用程序崩溃：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4123381|from+PyQt4+import+QtGui

class+Graphics(QtGui.QWidget):
++++def+__init__(self):
++++++++super(Graphics,+self).__init__()

++++++++layout+=+QtGui.QVBoxLayout(self)
++++++++layout.setMargin(0)

++++++++shad+=+QtGui.QGraphicsDropShadowEffect(self)
++++++++shad.setBlurRadius(5)

++++++++self.scene+=+QtGui.QGraphicsScene(self)
++++++++self.view+=+QtGui.QGraphicsView(self)
++++++++self.view.setScene(self.scene)
++++++++text+=+self.scene.addText("Drop+Shadow!")
++++++++text.setGraphicsEffect(shad)

++++++++layout.addWidget(self.view)

if+__name__+==+"__main__":
++++app+=+QtGui.QApplication([])
++++main+=+Graphics()
++++main.show()
++++main.raise_()
++++app.exec_()|code-block|syntax|javascript|4123382|entityMap^0|6|E|1H|7|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

I have only every tried to use this (and used it successfully) in <code>QGraphicsScene</code> situations. This works for me, while trying to set it on a normal <code>QWidget</code> actually crashes the entire application:

<pre><code>from PyQt4 import QtGui

class Graphics(QtGui.QWidget):
 def __init__(self):
 super(Graphics, self).__init__()

 layout = QtGui.QVBoxLayout(self)
 layout.setMargin(0)

 shad = QtGui.QGraphicsDropShadowEffect(self)
 shad.setBlurRadius(5)

 self.scene = QtGui.QGraphicsScene(self)
 self.view = QtGui.QGraphicsView(self)
 self.view.setScene(self.scene)
 text = self.scene.addText("Drop Shadow!")
 text.setGraphicsEffect(shad)

 layout.addWidget(self.view)

if __name__ == "__main__":
 app = QtGui.QApplication([])
 main = Graphics()
 main.show()
 main.raise_()
 app.exec_()
</code></pre>

I am creating a custom widget <code>my_widget</code> inheriting from <code>QWidget</code>.

Here, I have a label to which I would like to apply <code>QGraphicsDropShadowEffect</code> however it does not seem to be working since I don't see any shadows.

My code is in Python and it's:

<pre><code>eff = QGraphicsDropShadowEffect()
self.my_widget_label.setGraphicsEffect(eff)
</code></pre>

I tried various alterations to this code to no avail.

After doing a through search on Google, I came across many similar questions without answers.

What might be the cause? How can I get the shadow?

Qt QGraphicsDropShadowEffect is not showing

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在创建一个继承自QWidget的自定义小部件my_widget。在这里，我有一个标签，我想要应用QGraphicsDropShadowEffect，但它似乎不起作用，因为我没有看到任何阴影。我的代码是用Python编写的，它是：eff = QGraphicsDropShadowEffect()self.my_wid...

问Qt QGraphicsDropShadowEffect未显示
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