python-pyGTK / GTK filechooser-是否可以在将文件或文件夹写入光盘之前验证用户输入？

创建新文件夹时,我想在gtk.FileChooser对话框中验证用户对文件夹名称的选择.
我尝试连接到对话“响应”信号,但为时已晚,新文件夹将被写入光盘.
是否有其他方法可以实现此目的,然后在将文件夹写入光盘后验证文件夹？

感谢Mark …这是我正在使用的代码：

import gtk

def _newFolderDialog(currentFolder=None):

    newDialog = gtk.FileChooserDialog(
        title="Create new folder", parent=None, 
        action=gtk.FILE_CHOOSER_ACTION_CREATE_FOLDER, 
        buttons= (gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL), backend=None)
    newButton = newDialog.add_button(gtk.STOCK_NEW, gtk.RESPONSE_OK)
    if currentFolder is not None:
        newDialog.set_current_folder(currentFolder)

    newButton.connect("pressed", validateChoice, newDialog)

    response = newDialog.run()

    if response == gtk.RESPONSE_OK:
        newFolder = newDialog.get_filename()
        newDialog.destroy()
        return newFolder

    elif response == 1: # Validation was not satisfied
        msg = gtk.MessageDialog(parent=None, flags=gtk.DIALOG_MODAL,
            type=gtk.MESSAGE_ERROR, buttons=gtk.BUTTONS_OK, 
            message_format="Try again!")
        msg.run()
        msg.destroy()
        current_folder = newDialog.get_current_folder()
        newDialog.destroy()
        return _newFolderDialog(current_folder)

    elif response == 2: # Ok button was pressed, but with no entry
        current_folder = newDialog.get_current_folder()
        newDialog.destroy()
        return _newFolderDialog(current_folder)

    elif response == gtk.RESPONSE_CANCEL:
        newDialog.destroy()
        return None

def validateChoice(button, dialog):
    newFolder = dialog.get_filename()

    if newFolder is None: # The cursor was in the empty text entry box
        dialog.response(2)
    else:
        # If cursor is selecting a folder, lets unselect it, we are intereste
        # in the value in the entry text box.
        dialog.unselect_filename(newFolder) 
        newFolder = dialog.get_filename()

        if newFolder is None: # A folder was selected but empty text entry box
            dialog.response(2)

        ## do some validation, in this case the folder has to start with "/home"
        elif not newFolder.startswith("/home"):  
            dialog.response(1)
        else:
            dialog.response(gtk.RESPONSE_OK)

newFolder = _newFolderDialog()
print newFolder

解决方法:

我可以看到几种方法.

一种是,只需编写自己的响应ID处理程序,而不使用gtk.RESPONSE_OK(对于小部件而言,这意味着创建文件夹).如果以这种方式进行操作,则您将负责在验证后实际创建文件夹(os.path.mkdir).

第二,您可以覆盖对“新建”按钮的点击：

import gtk

def new_button_pressed(widget, data=None):
    ## data is a reference to the dialog widget
    ## do some validation, in this case the folder has to start with "/home"
    if not(data.get_filename().startswith("/home")):
        ## force cancel response
        print "failed validation..."        
        data.response(gtk.RESPONSE_CANCEL)
    else:
        print "success validation..."
        data.response(gtk.RESPONSE_OK)

newDialog = gtk.FileChooserDialog(
title="Create new folder", parent=None, 
action=gtk.FILE_CHOOSER_ACTION_CREATE_FOLDER, 
buttons= (gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL), backend=None)
new_button = newDialog.add_button(gtk.STOCK_NEW, gtk.RESPONSE_OK)
new_button.connect("pressed", new_button_pressed, newDialog)
newDialog.run()

标签：gtk,pygtk,filechooser,python
来源： https://codeday.me/bug/20191208/2094769.html