python通过Tkinter库实现的一个简单的文本编辑器代码

## {{{ 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() 

 

 

#该代码片段来自于: http://www.sharejs.com/codes/python/7818