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python将资源管理器拖放到tkinter条目小部件

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我对Python很新 . 我正在尝试将文件名(包含完整路径)输入到TKinter条目小部件 . 由于文件名的路径可能很长,我希望能够直接从Windows资源管理器拖放文件 . 在Perl中我看到了以下内容:

use Tk::DropSite;
.
.
my $mw = new MainWindow;
$top = $mw->Toplevel;
$label_entry = $top->Entry(-width => '45',. -background => 'ivory2')->pack();
$label_entry->DropSite(-dropcommand => \&drop,-droptypes => 'Win32',);

我在Python中使用TKinter可以做些什么吗?

2 回答

  • 15

    Tk没有任何处理它的命令,并且Python不包含任何额外的Tk扩展来执行拖放进程间应用程序,因此您需要扩展来执行操作 . Tkdnd(http://sourceforge.net/projects/tkdnd的Tk扩展,而不是Tkdnd.py模块)适合我 . 要从Python中使用它,需要一个包装器 . 快速搜索一个,似乎http://mail.python.org/pipermail/tkinter-discuss/2005-July/000476.html包含这样的代码 . 我做了另一个,因为我不喜欢那个 . 我的包装器的问题在于它是高度未经测试的,事实上我只使用函数 bindtarget 并且只用了10秒左右 .

    使用下面的包装器,您可以创建一些小部件并宣布它支持接收拖动的文件 . 这是一个例子:

    # The next two lines are not necessary if you installed TkDnd
    # in a proper place.
    import os
    os.environ['TKDND_LIBRARY'] = DIRECTORYTOTHETKDNDBINARY
    
    import Tkinter
    from untested_tkdnd_wrapper import TkDND
    
    root = Tkinter.Tk()
    
    dnd = TkDND(root)
    
    entry = Tkinter.Entry()
    entry.pack()
    
    def handle(event):
        event.widget.insert(0, event.data)
    
    dnd.bindtarget(entry, handle, 'text/uri-list')
    
    root.mainloop()
    

    以下是 untested_tkdnd_wrapper.py 的代码:

    import os
    import Tkinter
    
    def _load_tkdnd(master):
        tkdndlib = os.environ.get('TKDND_LIBRARY')
        if tkdndlib:
            master.tk.eval('global auto_path; lappend auto_path {%s}' % tkdndlib)
        master.tk.eval('package require tkdnd')
        master._tkdnd_loaded = True
    
    
    class TkDND(object):
        def __init__(self, master):
            if not getattr(master, '_tkdnd_loaded', False):
                _load_tkdnd(master)
            self.master = master
            self.tk = master.tk
    
        # Available pre-defined values for the 'dndtype' parameter:
        #   text/plain
        #   text/plain;charset=UTF-8
        #   text/uri-list
    
        def bindtarget(self, window, callback, dndtype, event='<Drop>', priority=50):
            cmd = self._prepare_tkdnd_func(callback)
            return self.tk.call('dnd', 'bindtarget', window, dndtype, event,
                    cmd, priority)
    
        def bindtarget_query(self, window, dndtype=None, event='<Drop>'):
            return self.tk.call('dnd', 'bindtarget', window, dndtype, event)
    
        def cleartarget(self, window):
            self.tk.call('dnd', 'cleartarget', window)
    
    
        def bindsource(self, window, callback, dndtype, priority=50):
            cmd = self._prepare_tkdnd_func(callback)
            self.tk.call('dnd', 'bindsource', window, dndtype, cmd, priority)
    
        def bindsource_query(self, window, dndtype=None):
            return self.tk.call('dnd', 'bindsource', window, dndtype)
    
        def clearsource(self, window):
            self.tk.call('dnd', 'clearsource', window)
    
    
        def drag(self, window, actions=None, descriptions=None,
                cursorwin=None, callback=None):
            cmd = None
            if cursorwin is not None:
                if callback is not None:
                    cmd = self._prepare_tkdnd_func(callback)
            self.tk.call('dnd', 'drag', window, actions, descriptions,
                    cursorwin, cmd)
    
    
        _subst_format = ('%A', '%a', '%b', '%D', '%d', '%m', '%T',
                '%W', '%X', '%Y', '%x', '%y')
        _subst_format_str = " ".join(_subst_format)
    
        def _prepare_tkdnd_func(self, callback):
            funcid = self.master.register(callback, self._dndsubstitute)
            cmd = ('%s %s' % (funcid, self._subst_format_str))
            return cmd
    
        def _dndsubstitute(self, *args):
            if len(args) != len(self._subst_format):
                return args
    
            def try_int(x):
                x = str(x)
                try:
                    return int(x)
                except ValueError:
                    return x
    
            A, a, b, D, d, m, T, W, X, Y, x, y = args
    
            event = Tkinter.Event()
            event.action = A       # Current action of the drag and drop operation.
            event.action_list = a  # Action list supported by the drag source.
            event.mouse_button = b # Mouse button pressed during the drag and drop.
            event.data = D         # The data that has been dropped.
            event.descr = d        # The list of descriptions.
            event.modifier = m     # The list of modifier keyboard keys pressed.
            event.dndtype = T
            event.widget = self.master.nametowidget(W)
            event.x_root = X       # Mouse pointer x coord, relative to the root win.
            event.y_root = Y
            event.x = x            # Mouse pointer x coord, relative to the widget.
            event.y = y
    
            event.action_list = str(event.action_list).split()
            for name in ('mouse_button', 'x', 'y', 'x_root', 'y_root'):
                setattr(event, name, try_int(getattr(event, name)))
    
            return (event, )
    

    与Tkdnd一起,你会发现一个 tkdnd.tcl 程序,它比它提供的自己的C扩展更高级别 . 我没有包装这个更高级别的代码,但是在Python中复制它比使用这个更低级别的包装器更有趣 .

  • 8

    自从这个问题最初发布以来,事情已经取得了进展,并且在SourceForge.net上可以使用tkdnd2.8(Tcl extensions)和TkinterDnD2(tkdnd2.8的Python包装器) .

    这里是最简单的示例代码,可以完全按照您的要求进行操作 .

    import Tkinter
    from TkinterDnD2 import *
    
    def drop(event):
        entry_sv.set(event.data)
    
    root = TkinterDnD.Tk()
    entry_sv = Tkinter.StringVar()
    entry = Tkinter.Entry(root, textvar=entry_sv, width=80)
    entry.pack(fill=Tkinter.X)
    entry.drop_target_register(DND_FILES)
    entry.dnd_bind('<<Drop>>', drop)
    root.mainloop()
    

    您可以在Python 2.7和3.6上查看How to Install and Use TkDnD with Python 2.7 Tkinter on OSX以获取Windows和Mac的下载和安装信息 .

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