我有一个图表,当用户右键单击时会显示一个弹出菜单。默认情况下会检查子选项A.我希望用户能够为不同的行为切换此复选标记。因此,我想知道A是否已经检查过,我希望在自己的函数中处理它。让我们调用创建菜单showPopupMenu()的函数和需要知道A commandA()的检查状态的函数。
现在,如果我默认选中A并打印出A的IsChecked()状态,则在showPopupMenu()中,该值为True,而在commandA()中,该值为false。如果默认情况下未选中A,则答案将被反转 - showPopupMenu()将检查状态显示为false,并且commandA()将其显示为true。这使得看起来commandA()中的IsChecked()状态与showPopupMenu()中的IsChecked()状态相反。为什么是这样?
import wxversion
wxversion.ensureMinimal('2.8')
from numpy import arange, sin, pi
import matplotlib
matplotlib.use('WX')
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.backends.backend_wx import NavigationToolbar2Wx
from matplotlib.figure import Figure
import wx
class MyForm(wx.Frame):
def __init__(self):
wx.Frame.__init__(self,None,-1,
'Example Frame',size=(550,350))
self.SetBackgroundColour(wx.NamedColor("WHITE"))
self.figure = Figure()
self.axes = self.figure.add_subplot(111)
t = arange(0.0,3.0,0.01)
s = sin(2*pi*t)
self.axes.plot(t,s)
self.canvas = FigureCanvas(self, -1, self.figure)
self.canvas.Bind(wx.EVT_RIGHT_DOWN,
self.showPopupMenu)
self.sizer = wx.BoxSizer(wx.VERTICAL)
self.sizer.Add(self.canvas, 1, wx.LEFT | wx.TOP | wx.GROW)
self.SetSizer(self.sizer)
self.Fit()
def showPopupMenu(self, event):
if not hasattr(self, "popupTwo"):
self.popupOne = wx.NewId()
self.popupTwo = wx.NewId()
self.popupThree = wx.NewId()
self.popupA = wx.NewId()
self.popupB = wx.NewId()
self.popupOne = wx.Menu()
my_a = self.popupOne.Append(self.popupA, "A", kind=wx.ITEM_CHECK)
self.popupOne.Append(self.popupB, "B")
self.popupOne.Check(self.popupA, True)
#self.popupOne.Check(self.popupA, False)
print "in showPopupMenu(): ",self.popupOne.IsChecked(self.popupA)
self.Bind(wx.EVT_MENU, self.commandA, my_a)
menu = wx.Menu()
menu.AppendMenu(-1, 'One', self.popupOne)
menu.Append(self.popupTwo, "Two")
menu.Append(self.popupThree, "Three")
self.PopupMenu(menu)
menu.Destroy()
def commandA(self, event):
print "in commandA(): ", self.popupOne.IsChecked(self.popupA)
# Run the program
if __name__ == "__main__":
app = wx.PySimpleApp()
frame = MyForm().Show()
app.MainLoop()
此脚本的输出:
showPopupMenu()中的:True
命令A()中的:错误
答案 0 :(得分:0)
单击A时,复选标记从True切换为False,这就是为什么在那里看到输出False的原因。但是,您每次都会创建并销毁窗口,这就是为什么您从未看到它改变检查状态的原因。
以下是如何设置菜单而不是每次都创建和销毁菜单的示例:
import wx
import gui
class MainFrame(wx.Frame):
def __init__( self, parent ):
wx.Frame.__init__ (self, parent)
# Layout my frame
sizer = wx.BoxSizer(wx.VERTICAL)
self.panel = wx.Panel(self)
self.panel.Layout()
self.panel.Bind(wx.EVT_RIGHT_DOWN, self.showPopupMenu)
sizer.Add( self.panel, 1, wx.EXPAND |wx.ALL, 0 )
self.SetSizer( sizer )
self.Layout()
# Add the menu
self.popupA = wx.NewId()
self.popupOne = wx.Menu()
my_a = self.popupOne.Append(self.popupA, "A", kind=wx.ITEM_CHECK)
self.popupOne.Check(self.popupA, True)
self.Bind(wx.EVT_MENU, self.commandA, my_a)
self.menu = wx.Menu()
self.menu.AppendMenu(-1, 'One', self.popupOne)
def showPopupMenu(self, event):
print "in showPopupMenu(): ",self.popupOne.IsChecked(self.popupA)
self.PopupMenu(self.menu)
def commandA(self, event):
event.Skip()
print "in commandA(): ", self.popupOne.IsChecked(self.popupA)
class app(wx.App):
def OnInit(self):
self.m_frame = MainFrame(None)
self.m_frame.Show()
self.SetTopWindow(self.m_frame)
return True
app = app(0)
app.MainLoop()