Pygtk:从容器中删除小部件,稍后再使用

问题描述 投票:7回答:3

我使用的是自定义容器,我需要在其中重新排列小部件的顺序,但是没有方法可以做到。因此,我尝试删除所有小部件并按顺序再次添加它们。

问题是,这无法正常工作,再次添加小部件后我看不到小部件,我猜发生的是,当我删除小部件时,它们变得无法实现。

有什么办法可以删除小部件,以后再使用?

gtk pygtk
3个回答
6
投票

pygtk docs提供了一些见识。

请注意,该容器将拥有一个引用小部件,并且这可能是最后持有的参考资料;所以从其容器中删除小部件可能会导致该小部件被破坏。如果您想再次使用小部件,则可以应该添加一个引用。

编辑

我刚刚快速修改了pygtk的Hello World,以在容器中添加/删除/重新排序窗口小部件。之所以有效,是因为button1是该类的成员变量,它永远不会超出范围。

#!/usr/bin/env python

# example helloworld2.py

import pygtk
pygtk.require('2.0')
import gtk

class HelloWorld2:

    # Our new improved callback.  The data passed to this method
    # is printed to stdout.
    def callback_remove(self, widget, data):
    self.box1.remove(self.button1);

    def callback_add(self, widget, data):
        self.box1.pack_start(self.button1, True, True, 0)

    # another callback
    def delete_event(self, widget, event, data=None):
        gtk.main_quit()
        return False

    def __init__(self):
        # Create a new window
        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)

        # This is a new call, which just sets the title of our
        # new window to "Hello Buttons!"
        self.window.set_title("Hello Buttons!")

        # Here we just set a handler for delete_event that immediately
        # exits GTK.
        self.window.connect("delete_event", self.delete_event)

        # Sets the border width of the window.
        self.window.set_border_width(10)

        # We create a box to pack widgets into.  This is described in detail
        # in the "packing" section. The box is not really visible, it
        # is just used as a tool to arrange widgets.
        self.box1 = gtk.HBox(False, 0)

        # Put the box into the main window.
        self.window.add(self.box1)

        # Creates a new button with the label "Button 1".
        self.button1 = gtk.Button("Button 1")

        # Now when the button is clicked, we call the "callback" method
        # with a pointer to "button 1" as its argument
        self.button1.connect("clicked", self.callback_remove, "button 1")

        # Instead of add(), we pack this button into the invisible
        # box, which has been packed into the window.
        self.box1.pack_start(self.button1, True, True, 0)

        # Always remember this step, this tells GTK that our preparation for
        # this button is complete, and it can now be displayed.
        self.button1.show()

        # Do these same steps again to create a second button
        self.button2 = gtk.Button("Button 2")

        # Call the same callback method with a different argument,
        # passing a pointer to "button 2" instead.
        self.button2.connect("clicked", self.callback_add, "button 2")

        self.box1.pack_start(self.button2, True, True, 0)

        # The order in which we show the buttons is not really important, but I
        # recommend showing the window last, so it all pops up at once.
        self.button2.show()
        self.box1.show()
        self.window.show()

def main():
    gtk.main()

if __name__ == "__main__":
    hello = HelloWorld2()
    main()

1
投票

只需将小部件的可见性属性设置为False,然后使用set_visible方法将其设置为True。


1
投票

不,他只需要widgrt。不需要它的对象。那么必须不要使用可见对象。它只会以图形方式隐藏。但是内存仍然不会释放

删除功能就是答案

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