Question

即使禁用了关联的菜单项，

wxPython加速器似乎也会启动。这是错误吗？在这种情况下，不应该不按下加速键吗？

在下面的简短独立示例中，如果右键单击，将显示一个弹出菜单，其中包含一个禁用的菜单项。关联的加速键 CMD S 仍然可以被触发，但是！

import wx

help = """
If you right click on this window, a popup menu will appear with
a single menuitem which is DISABLED.

The associated accelerator key CMD S can still be triggered, however.

Is this a bug?
Shouldn't the accelerator keys NOT fire when its associated menu item
is disabled?
"""

class MyForm(wx.Frame):

    def __init__(self):
        wx.Frame.__init__(self, None, wx.ID_ANY, "Accelerators fire even when menu item is disabled", size=(500,500))
        panel = wx.Panel(self, wx.ID_ANY)
        wx.StaticText(panel, wx.ID_ANY, help, wx.DefaultPosition, wx.DefaultSize, 0)
        self.popupmenu = wx.Menu()

        self.item: wx.Menuself.item = self.popupmenu.Append(wx.ID_ANY, "Do Something (CMD S)")
        self.Bind(wx.EVT_MENU, self.DoSomething, self.item)

        accel_tbl = wx.AcceleratorTable([(wx.ACCEL_CTRL,  ord('S'), self.item.GetId() )])
        self.SetAcceleratorTable(accel_tbl)

        self.item.Enable(False)  # hmm, accelerator still fires :-(

        self.Bind(wx.EVT_CONTEXT_MENU, self.OnRight)

    def OnRight(self, event):
        self.PopupMenu(self.popupmenu)

    def DoSomething(self, event):
        msg = f"Something is being triggered, even though menuitem enabled is {self.item.Enabled}"
        print(msg)
        dlg = wx.MessageDialog(self, msg, "Message", wx.OK | wx.ICON_INFORMATION)
        dlg.ShowModal()
        dlg.Destroy()


class MyApp(wx.App):
    def OnInit(self):
        frame = MyForm()
        frame.Show()
        self.SetTopWindow(frame)
        return True

# Run the program
if __name__ == "__main__":
    app = MyApp()
    app.MainLoop()

也许我需要显式地检查每个处理程序函数，是否启用了“触发它的菜单”。这听起来有点乏味-理想情况下，事情应该是自动的。有趣的是，this post讨论了这些事情如何真正实现自动化（虽然与wxpython不相关，并且似乎特定于Windows）。

如果加速器与菜单项和菜单具有相同的标识符项目为灰色或禁用，加速器已禁用且未启用生成WM_COMMAND或WM_SYSCOMMAND消息。

我正在Python 3.7和wxPython 4.04下运行Mac OSX。

Answer 1

我认为您可能是正确的。
您可能每次都必须检查或重建加速器表。
您可以使用以下方法暂时禁用所有Accelerators：

self.SetAcceleratorTable(wx.NullAcceleratorTable)

即使禁用了关联的菜单项，wxpython加速器也会触发

1 个答案: