在 python 中定期更新 gtk 的列表存储

updating the list store of gtk periodically in python

我是phyton编程新手,开发的gui界面有gtk框架和串口。它有一个 treeview 的 liststore 模型。我可以轻松地插入新行。 我在与主 gui 线程不同的线程中使用 serialport recive 回调,避免错过任何数据。收到新数据后,它应该更新树视图。但是,由于串口在不同的线程中,我不知道如何更新列表。请帮我做一下。

图形界面 class:

class MainGUI():
def __init__(self):
    self.builder = Gtk.Builder()
    self.builder.add_from_file("main.glade")
    self.builder.connect_signals(MainGUI)
    self.window = self.builder.get_object("window1")
    self.mycombobox = self.builder.get_object('comboboxtext1')
    self.toggle = self.builder.get_object('togglebutton1')
    self.table = self.builder.get_object('treeview2')
    self.list = self.builder.get_object('liststore1')
    self.scroll_window = self.builder.get_object('scrolledwindow1')

def show(self):
    print("App main thread number", format(threading.get_ident()))
    self.window.show()
    Gtk.main()

@staticmethod
def connect_toggled(_self):
    if main.toggle.get_active():
        main.toggle.set_label("Disconnect")
        serial_port.connect(main.mycombobox.get_active_text())
        t3 = threading.Thread(target=serial_port.read_from_port)
        t3.start()
        serial_port.disconnect()

def row_inserted_event(self, path, iter):
    """The actual scrolling method"""
    adj = main.scroll_window.get_vadjustment()
    adj.set_value(adj.get_upper() - adj.get_page_size())

def update_table(self):
    # for i in range(256):
    #     main.list.append(['aaa', 'ddds', i])
    #     if len(main.list) > 50:
    #         main.list.remove(main.list.get_iter(0))
    main.list.append(['aaa', 'ddds', 0])
    if len(main.list) > 50:
        main.list.remove(main.list.get_iter(0))
    print(len(main.list))

if __name__ == "__main__":
    serial_port = SerialPort()
    ports = SerialPort().list_ports()
    main = MainGUI()
    for port in ports:
        main.mycombobox.append_text(port)
    main.mycombobox.set_active(0)
    main.toggle.set_label("Connect")
    main.update_table()
    main.show()

串口class:

class SerialPort:
    def __init__(self):
        self.ser = serial.Serial()
        self.baud_rate = 115200

    def write(self, data):
        self.ser.write(bytes(data))
        print(data)

    def connect(self, port):
        print("serial port thread number = %d" % (threading.get_ident()))
        print("connected the port =  %s" % (port))
        self.ser.port = port
        self.ser.baudrate = self.baud_rate
        self.ser.timeout = 0
        if self.ser.isOpen():
            print("already connected this port = %s" % (port))
        else:
            self.ser.open()

    def disconnect(self):
        if self.ser.isOpen():
            self.ser.close()
            print("disconnected port")

    def read_from_port(self):
        while True:
            if self.ser.isOpen():
                reading = self.ser.readline()
                if len(reading) > 0:
                    self.received_callback(reading)
            time.sleep(0.1)

    def received_callback(self, data):
        print(data)

    def list_ports(self):
        if sys.platform.startswith('win'):
            ports = ['COM%s' % (i + 1) for i in range(256)]
        elif sys.platform.startswith('linux') or sys.platform.startswith('cygwin'):
            # this excludes your current terminal "/dev/tty"
            # ports = glob.glob('/dev/tty[A-Za-z]*')
            ports = ['/dev/pts/%s' % (i + 1) for i in range(256)]
        elif sys.platform.startswith('darwin'):
            ports = glob.glob('/dev/tty.*')
        else:
            raise EnvironmentError('Unsupported platform')

        result = []
        for port in ports:
            try:
                s = serial.Serial(port)
                s.close()
                result.append(port)
            except (OSError, serial.SerialException):
                pass
        return result

我认为您的问题更多地与线程 + GUI 有关,而不是 GTK。

据我所知,当您修改 treeview 的模型 liststore 时,后者应该立即更新。所以,那里应该没有问题。

使用线程和 GUI 时的一个基本原则是,您应该只从其自己的线程(主循环)内更新 GUI。所以你需要做的是让你的工作线程(串行端口连接线程)将更新发送到主 GUI 线程并让它更新 treeview。可以使用 GLib.idle_add 函数安排更新,让 GTK 在最方便的时候进行。

现在,要在线程之间进行通信,您可以使用 queue 模块。

我不太明白你的代码。所以我会写一个简单的例子(使用 gtk3 PyGObject,因为你没有指定)。

import threading
import queue
import gi
gi.require_version('Gtk', '3.0')
gi.require_version('GLib', '2.0')
from gi.repository import Gtk, GLib

def do_work(com_queue):
    # do some work
    com_queue.put("update for your treeview")
    # continue

class MainGUI(object):
    def __init__(self):
        self.com_queue = queue.Queue()
        self.worker_thread = None
        self.liststore = None
        # more gui initialization...

    def launch_worker_thread(self):
        self.worker_thread = threading.Thread(target=do_work, args=(self.com_queue,))
        self.worker_thread.start()
        Glib.timeout_add(1000, self.check_queue) # run check_queue every 1 second

    def check_queue(self):
        if self.worker_thread.is_alive():
            try:
                update = self.com_queue.get()
                GLib.idle_add(self.update_treeview, (update,)) # send tuple
            except queue.Empty:
                pass
            return True # to keep timeout running
        else:
            return False # to end timeout

    def update_treeview(self, update):
        self.liststore.append(update) # here update the treeview model with tuple

if __name__ == "__main__":
    gui = MainGUI()
    Gtk.main()

希望对您有所帮助。