python - wxPython 中加速器的编程绑定(bind)

Question

我正在尝试以编程方式在循环中的 wxPython 中创建和绑定(bind)加速器表，这样我就不必担心为每个加速器获取和分配新的 ID(以及为了从某些外部资源，而不是硬编码)。我还通过 lambda 将一些参数传递给处理程序，因为我的很多处理程序都是相同的，但参数不同(移动、缩放等)。

该类是 wx.Frame 的子类，setup_accelerators() 在初始化期间被调用。

def setup_accelerators(self):

    bindings = [
                  (wx.ACCEL_CTRL,  wx.WXK_UP, self.on_move, 'up'),
                  (wx.ACCEL_CTRL,  wx.WXK_DOWN, self.on_move, 'down'),
                  (wx.ACCEL_CTRL,  wx.WXK_LEFT, self.on_move, 'left'),
                  (wx.ACCEL_CTRL,  wx.WXK_RIGHT, self.on_move, 'right'),
                  ]


    accelEntries = []

    for binding in bindings:
        eventId = wx.NewId()
        accelEntries.append( (binding[0], binding[1], eventId) )

        self.Bind(wx.EVT_MENU, lambda event: binding[2](event, binding[3]), id=eventId)


    accelTable = wx.AcceleratorTable(accelEntries)
    self.SetAcceleratorTable(accelTable)

def on_move(self, e, direction):
    print direction

然而，这似乎将所有加速器绑定(bind)到最后一个条目，因此 Ctrl+Up 打印 "right"，就像所有其他三个。如何以这种方式正确绑定(bind)多个处理程序？

Answer 1

明白了。问题是你没有将你的方向作为你的 lambda 的参数传递(它只查看事件参数(和 self )，因为你的 lambda 被定义为接受)This页面为我提供了使它正常工作所需的帮助(这里是 gist ):

import wx

class MyForm(wx.Frame):

    #----------------------------------------------------------------------
    def __init__(self):
        wx.Frame.__init__(self, None, wx.ID_ANY, "Programmatic binding of accelerators in wxPython", size=(450,150))

        # Add a panel so it looks the correct on all platforms
        panel = wx.Panel(self, wx.ID_ANY)
        bindings = [
                  (wx.ACCEL_CTRL,  wx.WXK_UP, 'up'),
                  (wx.ACCEL_CTRL,  wx.WXK_DOWN, 'down'),
                  (wx.ACCEL_CTRL,  wx.WXK_LEFT, 'left'),
                  (wx.ACCEL_CTRL,  wx.WXK_RIGHT, 'right'),
                  ]


        accelEntries = []

        for binding in bindings:
            eventId = wx.NewId()
            accelEntries.append( (binding[0], binding[1], eventId) )

            self.Bind(wx.EVT_MENU, lambda evt, temp=binding[2]: self.on_move(evt, temp), id=eventId)

        accelTable  = wx.AcceleratorTable(accelEntries)
        self.SetAcceleratorTable(accelTable )
     #----------------------------------------------------------------------

    def on_move(self, Event, direction):
        print "You pressed CTRL+"+direction

# Run the program
if __name__ == "__main__":
    app = wx.App(False)
    frame = MyForm()
    frame.Show()
    app.MainLoop()

我原来的答案(这是一个可接受的替代解决方案)是:

import wx

class MyForm(wx.Frame):

    #----------------------------------------------------------------------
    def __init__(self):
        wx.Frame.__init__(self, None, wx.ID_ANY, "Tutorial", size=(500,500))

        # Add a panel so it looks the correct on all platforms
        panel = wx.Panel(self, wx.ID_ANY)
        bindings = [
                  (wx.ACCEL_CTRL,  wx.WXK_UP, self.on_move_up),
                  (wx.ACCEL_CTRL,  wx.WXK_DOWN, self.on_move_down),
                  (wx.ACCEL_CTRL,  wx.WXK_LEFT, self.on_move_left),
                  (wx.ACCEL_CTRL,  wx.WXK_RIGHT, self.on_move_right),
                  ]


        accelEntries = []

        for binding in bindings:
            eventId = wx.NewId()
            accelEntries.append( (binding[0], binding[1], eventId) )

            self.Bind(wx.EVT_MENU, binding[2], id=eventId)

        accelTable  = wx.AcceleratorTable(accelEntries)
        self.SetAcceleratorTable(accelTable )
     #----------------------------------------------------------------------
    def on_move_up(self, event):
        print "You pressed CTRL+up"
    def on_move_down(self, event):
        print "You pressed CTRL+down"
    def on_move_left(self, event):
        print "You pressed CTRL+left"
    def on_move_right(self, event):
        print "You pressed CTRL+right"

# Run the program
if __name__ == "__main__":
    app = wx.App(False)
    frame = MyForm()
    frame.Show()
    app.MainLoop()