python基于Tkinter库实现简单文本编辑器实例

本文实例讲述了python基于Tkinter库实现简单文本编辑器的方法。分享给大家供大家参考。具体实现方法如下：

    ## {{{ http://code.activestate.com/recipes/578568/ (r1)
    from Tkinter import * 
    from tkSimpleDialog import askstring
    from tkFileDialog  import asksaveasfilename
    from tkMessageBox import askokcancel     
    class Quitter(Frame):            
      def __init__(self, parent=None):     
        Frame.__init__(self, parent)
        self.pack()
        widget = Button(self, text='Quit', command=self.quit)
        widget.pack(expand=YES, fill=BOTH, side=LEFT)
      def quit(self):
        ans = askokcancel('Verify exit', "Really quit?")
        if ans: Frame.quit(self)
    class ScrolledText(Frame):
      def __init__(self, parent=None, text='', file=None):
        Frame.__init__(self, parent)
        self.pack(expand=YES, fill=BOTH)        
        self.makewidgets()
        self.settext(text, file)
      def makewidgets(self):
        sbar = Scrollbar(self)
        text = Text(self, relief=SUNKEN)
        sbar.config(command=text.yview)         
        text.config(yscrollcommand=sbar.set)      
        sbar.pack(side=RIGHT, fill=Y)          
        text.pack(side=LEFT, expand=YES, fill=BOTH)   
        self.text = text
      def settext(self, text='', file=None):
        if file: 
          text = open(file, 'r').read()
        self.text.delete('1.0', END)          
        self.text.insert('1.0', text)         
        self.text.mark_set(INSERT, '1.0')       
        self.text.focus()                
      def gettext(self):                
        return self.text.get('1.0', END+'-1c')     
    class SimpleEditor(ScrolledText):            
      def __init__(self, parent=None, file=None): 
        frm = Frame(parent)
        frm.pack(fill=X)
        Button(frm, text='Save', command=self.onSave).pack(side=LEFT)
        Button(frm, text='Cut',  command=self.onCut).pack(side=LEFT)
        Button(frm, text='Paste', command=self.onPaste).pack(side=LEFT)
        Button(frm, text='Find', command=self.onFind).pack(side=LEFT)
        Quitter(frm).pack(side=LEFT)
        ScrolledText.__init__(self, parent, file=file) 
        self.text.config(font=('courier', 9, 'normal'))
      def onSave(self):
        filename = asksaveasfilename()
        if filename:
          alltext = self.gettext()           
          open(filename, 'w').write(alltext)     
      def onCut(self):
        text = self.text.get(SEL_FIRST, SEL_LAST)    
        self.text.delete(SEL_FIRST, SEL_LAST)      
        self.clipboard_clear()       
        self.clipboard_append(text)
      def onPaste(self):                  
        try:
          text = self.selection_get(selection='CLIPBOARD')
          self.text.insert(INSERT, text)
        except TclError:
          pass                   
      def onFind(self):
        target = askstring('SimpleEditor', 'Search String?')
        if target:
          where = self.text.search(target, INSERT, END) 
          if where:                  
            print where
            pastit = where + ('+%dc' % len(target))  
            #self.text.tag_remove(SEL, '1.0', END)   
            self.text.tag_add(SEL, where, pastit)   
            self.text.mark_set(INSERT, pastit)     
            self.text.see(INSERT)          
            self.text.focus()            
    if __name__ == '__main__':
      try:
        SimpleEditor(file=sys.argv[1]).mainloop()  
      except IndexError:
        SimpleEditor().mainloop()

希望本文所述对大家的Python程序设计有所帮助。