隐藏Tkinter根窗口，同时显示模态窗口-Java 学习之路

我有一个基于TKinter的应用程序，试图管理游戏的设置 . 用户可能安装了此游戏的多个版本，在这种情况下，我需要询问用户他们想要在启动时管理哪个安装 . 那部分单独运作得很好;构建主窗口后弹出选择对话框，并以模态方式运行 .

但是，由于游戏版本之间存在差异，如果我可以针对这些情况稍微调整界面将会很有用 . 然而，这意味着我无法真正构建主窗口，直到我知道我正在处理哪个安装，因此在用户做出选择之前它将是空白的 .

我希望在显示此对话框时隐藏根窗口，但在根窗口上调用 withdraw 只会导致模式对话框也不显示 - Python最终会挂起而没有CPU使用情况，我可以't figure out how to get around the problem without having to resort to a non-modal window (and a significantly different control flow, which I'喜欢避免） .

展示问题和一般代码结构的示例代码（Python 2.7）：

from Tkinter import *
from ttk import *

class TkGui(object):
    def __init__(self):
        self.root = root = Tk()
        self.root.withdraw()
        selector = FolderSelection(self.root, ('foo', 'bar'))
        self.root.deiconify()
        print(selector.result)

class ChildWindow(object): #Base class
    def __init__(self, parent, title):
        top = self.top = Toplevel(parent)
        self.parent = parent
        top.title(title)
        f = Frame(top)
        self.create_controls(f)
        f.pack(fill=BOTH, expand=Y)

    def create_controls(self, container):
        pass

    def make_modal(self, on_cancel):
        self.top.transient(self.parent)
        self.top.wait_visibility() # Python will hang here...
        self.top.grab_set()
        self.top.focus_set()
        self.top.protocol("WM_DELETE_WINDOW", on_cancel)
        self.top.wait_window(self.top) # ...or here, if wait_visibility is removed

class FolderSelection(ChildWindow):
    def __init__(self, parent, folders):
        self.parent = parent
        self.listvar = Variable(parent)
        self.folderlist = None
        super(FolderSelection, self).__init__(parent, 'Select folder')
        self.result = ''
        self.listvar.set(folders)
        self.make_modal(self.cancel)

    def create_controls(self, container):
        f = Frame(container)
        Label(
            f, text='Please select the folder '
            'you would like to use.').grid(column=0, row=0)
        self.folderlist = Listbox(
            f, listvariable=self.listvar, activestyle='dotbox')
        self.folderlist.grid(column=0, row=1, sticky="nsew")
        Button(
            f, text='OK', command=self.ok
            ).grid(column=0, row=2, sticky="s")
        self.folderlist.bind("<Double-1>", lambda e: self.ok())
        f.pack(fill=BOTH, expand=Y)

    def ok(self):
        if len(self.folderlist.curselection()) != 0:
            self.result = self.folderlist.get(self.folderlist.curselection()[0])
            self.top.protocol('WM_DELETE_WINDOW', None)
            self.top.destroy()

    def cancel(self):
        self.top.destroy()

TkGui()

1 回答

在您的情况下似乎没有差异，模态窗口与否 . 实际上，您只需要使用 wait_window() 方法 . 根据docs：

在许多情况下，以同步方式处理对话更为实际;创建对话框，显示它，等待用户关闭对话框，然后继续执行您的应用程序 . wait_window方法正是我们所需要的;它进入一个本地事件循环，直到给定的窗口被销毁（通过destroy方法，或通过窗口管理器显式）才返回 .

考虑使用非模态窗口的示例：

from Tkinter import *

root = Tk()

def go():
   wdw = Toplevel()
   wdw.geometry('+400+400')
   e = Entry(wdw)
   e.pack()
   e.focus_set()
   #wdw.transient(root)
   #wdw.grab_set()
   root.wait_window(wdw)
   print 'done!'

Button(root, text='Go', command=go).pack()
Button(root, text='Quit', command=root.destroy).pack()

root.mainloop()

单击 Go 按钮时，将出现非模态对话框，但代码将停止执行，并且只有在关闭对话框窗口后才会显示字符串 done! .

如果这是你想要的行为，那么这是你修改过的形式的例子（我修改了TkGui中的 __init__ 和 make_modal 方法，也添加了 mainloop() ）：

from Tkinter import *
from ttk import *

class TkGui(object):
    def __init__(self):
        self.root = root = Tk()
        self.root.withdraw()
        selector = FolderSelection(self.root, ('foo', 'bar'))
        self.root.deiconify()
        print(selector.result)

class ChildWindow(object): #Base class
    def __init__(self, parent, title):
        top = self.top = Toplevel(parent)
        self.parent = parent
        top.title(title)
        f = Frame(top)
        self.create_controls(f)
        f.pack(fill=BOTH, expand=Y)

    def create_controls(self, container):
        pass

    def make_modal(self, on_cancel):
        #self.top.transient(self.parent)
        #self.top.wait_visibility() # Python will hang here...
        #self.top.grab_set()
        self.top.focus_set()
        self.top.protocol("WM_DELETE_WINDOW", on_cancel)
        self.top.wait_window(self.top) # ...or here, if wait_visibility is removed

class FolderSelection(ChildWindow):
    def __init__(self, parent, folders):
        self.parent = parent
        self.listvar = Variable(parent)
        self.folderlist = None
        super(FolderSelection, self).__init__(parent, 'Select folder')
        self.result = ''
        self.listvar.set(folders)
        self.make_modal(self.cancel)

    def create_controls(self, container):
        f = Frame(container)
        Label(
            f, text='Please select the folder '
            'you would like to use.').grid(column=0, row=0)
        self.folderlist = Listbox(
            f, listvariable=self.listvar, activestyle='dotbox')
        self.folderlist.grid(column=0, row=1, sticky="nsew")
        Button(
            f, text='OK', command=self.ok
            ).grid(column=0, row=2, sticky="s")
        self.folderlist.bind("<Double-1>", lambda e: self.ok())
        f.pack(fill=BOTH, expand=Y)

    def ok(self):
        if len(self.folderlist.curselection()) != 0:
            self.result = self.folderlist.get(self.folderlist.curselection()[0])
            self.top.protocol('WM_DELETE_WINDOW', None)
            self.top.destroy()

    def cancel(self):
        self.top.destroy()

TkGui()
mainloop()

代码在 selector = FolderSelection(self.root, ('foo', 'bar')) 行停止，然后在关闭对话框后继续 .

回复于 2024-04-19T08:29:46+08:00

隐藏Tkinter根窗口，同时显示模态窗口

1 回答

相关问题