XRCed是wxPython附带的UI设计器,生成xrc资源文件,也可以输出python代码。本文对XRCed输出的python代码进行分析。
创建一个xrc文件如下,有两个窗口,每个窗口内一个按钮,UNTITLED.xrc:
<?xml version="1.0" encoding="utf-8"?>
<resource>
<object class="wxFrame" name="FRAME1">
<title></title>
<object class="wxPanel">
<object class="wxButton" name="myTestButton">
<label>BUTTON</label>
</object>
</object>
</object>
<object class="wxFrame" name="FRAME2">
<title></title>
<object class="wxPanel">
<object class="wxButton">
<label>BUTTON</label>
</object>
</object>
</object>
</resource>
然后生成python代码,UNTITLED_xrc.py:
#This file was automatically generated by pywxrc, do not edit by hand.
# -*- coding: UTF-8 -*-
import wx
import wx.xrc as xrc
__res = None
def get_resources():
""" Thisfunction provides access to the XML resources in this module."""
global __res
if __res== None:
__init_resources()
return __res
class xrcFRAME1(wx.Frame):
def PreCreate(self, pre):
""" This function is called during theclass's initialization.
Overrideit for custom setup before the window is created usually to
setadditional window styles using SetWindowStyle() and SetExtraStyle()."""
pass
def __init__(self, parent):
# Two stage creation (see http://wiki.wxpython.org/index.cgi/TwoStageCreation)
pre= wx.PreFrame()
self.PreCreate(pre)
get_resources().LoadOnFrame(pre,parent, "FRAME1")
self.PostCreate(pre)
# create attributes for the named items inthis container
self.myTestButton= xrc.XRCCTRL(self, "myTestButton")
class xrcFRAME2(wx.Frame):
def PreCreate(self, pre):
""" This function is called during theclass's initialization.
Overrideit for custom setup before the window is created usually to
setadditional window styles using SetWindowStyle() and SetExtraStyle()."""
pass
def __init__(self, parent):
# Two stage creation (see http://wiki.wxpython.org/index.cgi/TwoStageCreation)
pre= wx.PreFrame()
self.PreCreate(pre)
get_resources().LoadOnFrame(pre,parent, "FRAME2")
self.PostCreate(pre)
# create attributes for the named items inthis container
# ------------------------ Resourcedata ----------------------
def __init_resources():
global __res
__res = xrc.EmptyXmlResource()
__res.Load('UNTITLED.xrc')
从生成的Python代码可以看到:
* 只生成了Frame类,而不是一个可运行的Python程序。
为了运行显示上述的两个窗口,必须手工写如下代码:
import wx
import UNTITLED_xrc
app = wx.PySimpleApp()
frm1 = UNTITLED_xrc.xrcFRAME1(parent=None)
frm2 = UNTITLED_xrc.xrcFRAME2(parent=None)
frm1.Show()
frm2.Show()
app.MainLoop()
* 两个窗口资源在同一个文件中。
如果要分开多个文件,只能分多个xrc文件创建。
* 该自动生成文件不应该手工编辑,见头部:“do not edit by hand”。
所以对窗口类的自定义行为,如消息绑定,都需要继承该xrcFRAME。
其中有个“PreCreate()”,可以在子类中覆盖,对窗口进行预创建。
* 资源仅在使用到时才装载。所以分多个xrc资源是有利的。
* 对于命名控件,如“myTestButton”会自动创建,变量名相同。
(转载请注明来源于金庆的专栏)