Python,Gtk3:如何在其他内容运行时使进度条脉动

时间:2016-05-18 06:57:27

标签: python pygtk gtk3 pyobject

基于类,我有一个包含buttonprogressbar的窗口,每当点击按钮时,就会发生两件事情:

  

1 - 应该从对话框传递给class ABCD

     

2 - 当我们的班级ABCD()完成他的工作时,我们的进度条应该进行常规脉冲,直到ABCD()类完成过程。

所以问题是进度条脉冲只有一次,然后一直停留在ABCD()类完成,然后它开始定时脉动。

这是我的尝试:

import gi,time
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk, GObject

class DialogExample(Gtk.Dialog):

    def __init__(self, parent):
        Gtk.Dialog.__init__(self, "My Dialog", parent, 0,
            (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
             Gtk.STOCK_OK, Gtk.ResponseType.OK))

        self.set_default_size(150, 100)

        self.Myinput = Gtk.Entry()

        box = self.get_content_area()
        box.add(self.Myinput)
        self.show_all()

class DialogWindow(Gtk.Window):

    def __init__(self):
        Gtk.Window.__init__(self, title="Dialog Example")

        self.set_border_width(6)
        Hbox = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL)
        self.add(Hbox)

        self.button = Gtk.Button("Open dialog")
        self.button.connect("clicked", self.on_button_clicked)

        Hbox.pack_start(self.button, True, True, 0)

        self.progressbar = Gtk.ProgressBar()
        Hbox.pack_start(self.progressbar, True, True, 0)

#~~~~~~ Progress Bar
    def on_timeout(self, user_data):
        """
        Update value on the progress bar
        """
        if self.activity_mode:
            self.progressbar.pulse()
        else:
            new_value = self.progressbar.get_fraction() + 0.01

            if new_value > 1:
                new_value = 0

            self.progressbar.set_fraction(new_value)

        # As this is a timeout function, return True so that it
        # continues to get called
        return True

    def on_button_clicked(self, widget):
        dialog = DialogExample(self)
        response = dialog.run()

        if response == Gtk.ResponseType.OK:
            variable = dialog.Myinput.get_text()
            print("start")
        dialog.destroy()

        #ProgressBar time function

        self.timeout_id = GObject.timeout_add(50, self.on_timeout, None)
        self.activity_mode = False
        self.progressbar.pulse()

        #this for Updating the Windows and make the progressbar pulsing while waiting
        # the class ABCD finish his stuff, finally should stop pulsing.
        while Gtk.events_pending():
            Gtk.main_iteration_do(False)
        passing_instance = ABCD(variable)


class ABCD(object):
    def __init__(self,value_of_dialog):
        self.get_value = value_of_dialog
        self.for_add = "______ add was done"
        self.final_value = self.get_value+self.for_add
        time.sleep(10)
        print("gonna be finished")
        print(self.final_value)



win = DialogWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()

正如我们在这里看到的,我已经尝试在这部分代码中制作脉冲并刷新窗口

self.timeout_id = GObject.timeout_add(50, self.on_timeout, None)
self.activity_mode = False
self.progressbar.pulse()

#this for Updating the Windows and make the progressbar pulsing while waiting
# the class ABCD finish his stuff, finally should stop pulsing.
while Gtk.events_pending():
    Gtk.main_iteration_do(False)
  

否则因为在my class ABCD()我应该time.sleep(10)   进度条脉冲仅在10秒后才开始   停止。

这段代码应该如何,我需要有人为我提供正确的代码,几乎没有解释。

1 个答案:

答案 0 :(得分:1)

使用sleep来模拟时间的流逝的问题是sleep将停止线程中发生的所有事情,在这种情况下会阻止线程到达Gtk.main()这是进度条脉冲或更新所必需的。

因此,为了正确地做到这一点,有两个选择:

  1. 在一个单独的线程中运行ABCD,以便主线程可以到达Gtk.main()。这将确保进度条按预期移动。一个简单的例子如下:

    self.abcd_thread = ABCD(variable)
    self.abcd_thread.start()
    
    class ABCD(Thread):
        def __init__(self, value_of_dialog):
            super(ABCD, self).__init__()
            self.get_value = value_of_dialog
            self.for_add = "______ add was done"
            self.final_value = self.get_value+self.for_add
    
        def run(self):
            print "Starting " + self.name
    
            time.sleep(10)
            print("gonna be finished")
            print(self.final_value)
    
            print "Exiting " + self.name
    

    使用此功能时,您可以使用self.abcd_thread.isAlive()查看该线程是否仍在计算内容。返回信息的方式很大程度上取决于线程中的工作。

  2. time.sleep替换为以下片段:

    now = time.time()
    while time.time() - now < 10:
        # Insert any code here
        Gtk.main_iteration_do(False)
    

    这仍然会模仿ABCD做10秒的事情,但因为我们在循环的每次迭代中调用Gtk.main_iteration_do(False),GTK能够在循环期间更新接口。

  3. 一般来说,第二个选项最简单,因为它只涉及在你做任何事情时拨打Gtk.main_iteration_do(False)。另一方面,第一个选项在处理复杂计算时更有用,其中添加Gtk调用并不容易。