发布于 2014-09-30 14:20:01 | 372 次阅读 | 评论: 0 | 来源: 网友投递
wxPython Python GUI图形库
wxPython是Python语言的一套优秀的GUI图形库,允许Python程序员很方便的创建完整的、功能键全的GUI用户界面。 wxPython是作为优秀的跨平台GUI库wxWidgets的Python封装和Python模块的方式提供给用户的。
本文为大家讲解了wxPython库的事件驱动机制,以一个获取当前位置信息的实例形式讲述了wxPython事件驱动机制及其相关函数的用法,感兴趣的朋友可以参考下
先来看看如下代码:
#!/usr/bin/python # moveevent.py import wx #导入wx库 class MoveEvent(wx.Frame): def __init__(self, parent, id, title): wx.Frame.__init__(self, parent, id, title, size=(250, 180)) #窗口大小为(250, 180) wx.StaticText(self, -1, 'x:', (10,10))#parent, id, title, point wx.StaticText(self, -1, 'y:', (10,30)) self.st1 = wx.StaticText(self, -1, '', (30, 10)) self.st2 = wx.StaticText(self, -1, '', (30, 30)) self.Bind(wx.EVT_MOVE, self.OnMove) #绑定Frame的move事件 self.Centre() self.Show(True) def OnMove(self, event): x, y = event.GetPosition() self.st1.SetLabel(str(x)) self.st2.SetLabel(str(y)) app = wx.App()#生成应用程序 MoveEvent(None, -1, 'move event')#调用自己的类,三个参数为:parent, id , title app.MainLoop()#应用程序事件循环
程序运行效果如下图所示:
wxStaticText的两个构造函数官方文档如下:
wxStaticText ()
Default constructor.
wxStaticText (wxWindow *parent, wxWindowID id, const wxString &label, const wxPoint &pos=wxDefaultPosition, const wxSize &size=wxDefaultSize, long style=0, const wxString&name=wxStaticTextNameStr)
Constructor, creating and showing a text control.
The event parameter in the OnMove() method is an object specific to a particular event type. In our case it is the instance of a wx.MoveEvent class. This object holds information about the event. For example the Event object or the position of the window. In our case the Event object is the wx.Frame widget. We can find out the current position by calling the GetPosition() method of the event.
OnMove()方法中的event参数是一种特殊的事件类型,在我们的例子中,它是wx.MoveEvnet类的一个实例.这个对象保存了事件的一些信息,比如这个事件对象或者窗口的位置.在我们例子中事件对象是一个wx.Frame控件.我们可以通过调用事件对象的GetPosition()得到当前位置信息.
Vetoing events
Sometimes we need to stop processing an event. To do this, we call the method Veto().
#!/usr/bin/python # veto.py import wx class Veto(wx.Frame): def __init__(self, parent, id, title): wx.Frame.__init__(self, parent, id, title, size=(250, 200)) self.Bind(wx.EVT_CLOSE, self.OnClose) self.Centre() self.Show(True) def OnClose(self, event): dial = wx.MessageDialog(None, 'Are you sure to quit?', 'Question', wx.YES_NO | wx.NO_DEFAULT | wx.ICON_QUESTION) ret = dial.ShowModal() if ret == wx.ID_YES: self.Destroy() else: event.Veto() app = wx.App() Veto(None, -1, 'Veto') app.MainLoop()