python - PyQt4 - 创建一个计时器

Question

对于这个问题，我很抱歉，但我已经阅读了很多东西，但似乎我不知道如何制作计时器。所以我发布了我的代码:

from PyQt4 import QtGui, QtCore
from code.pair import Pair
from code.breadth_first_search import breadth_first_search
import functools


class Ghosts(QtGui.QGraphicsPixmapItem):

    def __init__(self, name):
        super(Ghosts, self).__init__()

        self.set_image(name)

    def chase(self, goal):
        pos = Pair(self.x(), self.y())
        path = breadth_first_search(pos, goal)
        while not path.empty():
            aim = path.get_nowait()
            func = functools.partial(self.move_towards, aim)
            timer = QtCore.QTimer()
            QtCore.QTimer.connect(timer, QtCore.SIGNAL("timeout()"), self, QtCore.SLOT("func()"))
            timer.start(200)

    def move_towards(self, goal):
        self.setPos(goal.first(), goal.second())

我试图让物体每 200 毫秒向其目标移动一次。 我没有 self 尝试它给了我同样的错误:

QObject.connect(QObject, SIGNAL(), QObject, SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'bytes'
QObject.connect(QObject, SIGNAL(), callable, Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'bytes'
QObject.connect(QObject, SIGNAL(), SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 2 has unexpected type 'bytes'

我不知道如何将计时器连接到带参数的函数。 我认为我没有正确使用 SLOT 参数，但它给了我那些神秘的赌注。我想这都是错误的。我会很感激一些帮助:)

Answer 1

使用新样式的信号，它们更容易理解。

交换-

QtCore.QTimer.connect(timer, QtCore.SIGNAL("timeout()"), self, QtCore.SLOT("func()"))

与 -

timer.timeout.connect(self.move_towards)   # assuming that move_towards is the handler

一个简单但完整的工作计时器示例 -

import sys

from PyQt4.QtCore import QTimer
from PyQt4.QtGui import QApplication

app = QApplication(sys.argv)
app.setQuitOnLastWindowClosed(False)

def tick():
    print 'tick'

timer = QTimer()
timer.timeout.connect(tick)
timer.start(1000)

# run event loop so python doesn't exit
app.exec_()