Question

我在QtDesigner中创建了一个QGraphicsView。现在我想将mouseMoveEvent连接到它。我知道我必须定义一个继承自QGraphicsView的新类，并覆盖mouseMoveEvent。 Here是一个很好的解释如何做到这一点。

所以我将QtDesigner中的QGraphicsView实例提升为新类floorplanView。我想在我的主python文件main.py中定义这个类，因为它在另一个例子中完成：

import QtGui

class floorplanViewClass(QtGui.QGraphicsView):
    moved = pyqtSignal(QMouseEvent)

  def __init__(self, parent = None):
      super(MyView, self).__init__(parent)

  def mouseMoveEvent(self, event):
      super(MyView, self).mouseMoveEvent(event)
      print "Mouse Pointer is currently hovering at: ", event.pos()
      self.moved.emit(event)

我的第一个问题：我必须在Header文件字段中输入什么内容？ main.h和main main都给了我：

File "<stdin>", line 1, in <module>
File "C:\Anaconda2\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 699, in runfile
execfile(filename, namespace)
File "C:\Anaconda2\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 74, in execfile
exec(compile(scripttext, filename, 'exec'), glob, loc)
File "C:/Users/Oliver/Desktop/pyqt/DRS.py", line 23, in <module>
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile)
File "C:\Anaconda2\lib\site-packages\PyQt4\uic\__init__.py", line 211, in loadUiType
exec(code_string.getvalue(), ui_globals)
File "<string>", line 1317, in <module>
File "DRS.py", line 23, in <module>
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile)
File "C:\Anaconda2\lib\site-packages\PyQt4\uic\__init__.py", line 211, in loadUiType
exec(code_string.getvalue(), ui_globals)
File "<string>", line 1317, in <module>
ImportError: cannot import name floorplanViewClass

PyQt是第4版。

Answer 1

我通过反复试验解决了这个问题：

首先（不是问题的解决方案），myView必须替换为新定义的类的名称。并且pyqtsignal和QMouseEvent必须获取相应的模块名称（我的错）：

from PyQt4 import QtCore, QtGui

class floorplanViewClass(QtGui.QGraphicsView):
    moved = QtCore.pyqtSignal(QtGui.QMouseEvent)

    def __init__(self, parent = None):
        super(floorplanViewClass, self).__init__(parent)

    def mouseMoveEvent(self, event):
        # call the base method to be sure the events are forwarded to the scene
        super(floorplanViewClass, self).mouseMoveEvent(event)

        print "Mouse Pointer is currently hovering at: ", event.pos()
        self.moved.emit(event)

问题的原因是

尚未加载Qt GUI

qtCreatorFile = "..."
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile)

但是，这两行必须位于Application类的定义之上。因此，正确的顺序是：

class floorplanViewClass(QtGui.QGraphicsView):
    ...

qtCreatorFile = "..." # insert filename of the GUI here
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile)

class MyApp(QtGui.QMainWindow, Ui_MainWindow):
    ...

通过创建子类将mouseMoveEvent连接到小部件

1 个答案: