PyQt子窗口小部件不接收paintEvent
我在qt设计器中创建了一个小部件,并使用pyuic将ui文件转换为一个名为ui_wid_canvas的python类。这应该用作特殊画布:PyQt子窗口小部件不接收paintEvent,qt,pyqt,paintevent,Qt,Pyqt,Paintevent,我在qt设计器中创建了一个小部件,并使用pyuic将ui文件转换为一个名为ui_wid_canvas的python类。这应该用作特殊画布: # file mgcanvas.py from PyQt4 import QtCore, QtGui class Ui_wid_canvas(object): def setupUi(self, wid_canvas): wid_canvas.setObjectName("wid_canvas") wid_canva
# file mgcanvas.py
from PyQt4 import QtCore, QtGui
class Ui_wid_canvas(object):
def setupUi(self, wid_canvas):
wid_canvas.setObjectName("wid_canvas")
wid_canvas.resize(400, 300)
self.horizontalLayout = QtGui.QHBoxLayout(wid_canvas)
self.horizontalLayout.setObjectName("horizontalLayout")
self.pushButton = QtGui.QPushButton(wid_canvas)
self.pushButton.setObjectName("pushButton")
self.horizontalLayout.addWidget(self.pushButton)
self.retranslateUi(wid_canvas)
QtCore.QMetaObject.connectSlotsByName(wid_canvas)
def retranslateUi(self, wid_canvas):
wid_canvas.setWindowTitle(QtGui.QApplication.translate("wid_canvas", "Form", None, QtGui.QApplication.UnicodeUTF8))
self.pushButton.setText(QtGui.QApplication.translate("wid_canvas", "PushButton", None, QtGui.QApplication.UnicodeUTF8))
我从Ui_wid_canvas派生了一个类MyCanvas来实现paintEvent函数和一些实用函数,如moo()。在paintevent中,它所要做的就是画两个矩形。如果我使用下面的类作为我的应用程序,那么一切都像一个符咒
# file mycanvas.py
from PyQt4 import QtCore, QtGui
import mgcanvas
class MyCanvas(mgcanvas.Ui_wid_canvas, QtGui.QWidget):
def __init__(self):
super(mgcanvas.Ui_wid_canvas, self).__init__()
self.setupUi(self)
def paintEvent(self, qpaintevent):
print "PaintEvent canvas"
painter = QtGui.QPainter(self)
painter.setBrush(QtGui.QColor(255,0,0,80))
painter.setPen(QtGui.QColor(00,00,00,255))
painter.drawRect(10,10,100,100)
r = QtCore.QRectF(110,110,100,100)
painter.drawRect(r)
painter.drawText(r,"Hello", QtGui.QTextOption(QtCore.Qt.AlignCenter))
def moo(self):
print "This is canvas mooing"
现在,当我创建一个实例化MyCanvas的应用程序测试(见下文)时,将调用测试的paintEvent,但从未调用MyCanvcas的paintEvent,不会绘制矩形,也不会在控制台上输出“paintEvent Canvas”。如果在Test.paintevent()中调用self.widget.update()
或self.widget.redraw()
,则不会捕获paintevent。如果我手动调用self.widget.paintevent(),则会调用该函数,但不会激活画师。另一方面,显示的是按钮,从中我可以看出小部件被正确地包含,但子小部件并没有调用绘制事件
# file test.py; executed with `python test.py`
from PyQt4 import QtCore, QtGui
import mycanvas
class Test(object):
def setupUi(self, Gui):
self.counter = 0
Gui.setObjectName("TestObject")
Gui.resize(500,500)
self.layout = QtGui.QVBoxLayout()
self.widget = mycanvas.MyCanvas()
self.widget.setupUi(self)
self.widget.setObjectName("wid_canvas")
self.layout.addWidget(self.widget)
self.retranslateUi(Gui)
QtCore.QMetaObject.connectSlotsByName(Gui)
def retranslateUi(self, Gui):
Gui.setWindowTitle(QtGui.QApplication.translate("TestObject", "Title", None, QtGui.QApplication.UnicodeUTF8))
def paintEvent(self, qpaintevent):
print "---> Enter"
self.counter += 1
print "counter", self.counter
self.widget.repaint()
self.widget.moo()
print "<-- Leave"
class MyTest(Test, QtGui.QWidget):
def __init__(self):
super(Test, self).__init__()
self.setupUi(self)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
ui = MyTest()
ui.show()
sys.exit(app.exec_())
#文件test.py;使用“python test.py”执行`
从PyQt4导入QtCore、QtGui
导入mycanvas
类别测试(对象):
def设置UI(自我,Gui):
self.counter=0
setObjectName(“TestObject”)
Gui.resize(500500)
self.layout=QtGui.QVBoxLayout()
self.widget=mycanvas.mycanvas()
self.widget.setupUi(self)
self.widget.setObjectName(“wid_画布”)
self.layout.addWidget(self.widget)
自重传(Gui)
QtCore.QMetaObject.connectSlotsByName(Gui)
def重新传输(自身、Gui):
setWindowTitle(QtGui.QApplication.translate(“TestObject”,“Title”,None,QtGui.QApplication.UnicodeUTF8))
def paintEvent(自我、qpaintevent):
打印“-->Enter”
self.counter+=1
打印“计数器”,自我计数器
self.widget.repaint()
self.widget.moo()
打印“在您的类测试中,您没有将布局作为参数传递给QVBoxLayout,从而将布局附加到参数Gui
,并且您调用了self.widget.setupUi
,用于MyCanvas
,尽管MyCanvas
构造函数已经调用了它
class Test(object):
def setupUi(self, Gui):
self.counter = 0
Gui.setObjectName("TestObject")
Gui.resize(500,500)
self.layout = QtGui.QVBoxLayout(Gui)
self.widget = mycanvas.MyCanvas()
self.widget.setObjectName("wid_canvas")
self.layout.addWidget(self.widget)
self.retranslateUi(Gui)
QtCore.QMetaObject.connectSlotsByName(Gui)
在您的类测试中,您没有通过将布局作为参数传递给QVBoxLayout来将布局附加到参数Gui
,并且您为MyCanvas
调用了self.widget.setupUi
,尽管它已经被MyCanvas
构造函数调用
class Test(object):
def setupUi(self, Gui):
self.counter = 0
Gui.setObjectName("TestObject")
Gui.resize(500,500)
self.layout = QtGui.QVBoxLayout(Gui)
self.widget = mycanvas.MyCanvas()
self.widget.setObjectName("wid_canvas")
self.layout.addWidget(self.widget)
self.retranslateUi(Gui)
QtCore.QMetaObject.connectSlotsByName(Gui)
类MyCanvas
的代码在哪里?抱歉,粘贴了错误的代码。已修复。类MyCanvas
的代码在哪里?抱歉,粘贴了错误的代码。已修复。