1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtCore import (Qt, QEvent, QObject, QTimer, Signal, Slot)
from PySide6.QtGui import (QColor, QFont, QPalette)
from PySide6.QtWidgets import (QApplication, QGridLayout, QLabel, QMainWindow, QVBoxLayout, QWidget)
import outcome
import signal
import sys
import traceback
import trio
from random import randint
class MainWindow(QMainWindow):
set_num = Signal(int, QColor)
def __init__(self, rows, cols):
super().__init__()
self.rows = rows
self.cols = cols
widget_central = QWidget()
self.setCentralWidget(widget_central)
layout_outer = QVBoxLayout(widget_central)
self.widget_outer_text = QLabel()
font = QFont()
font.setPointSize(14)
self.widget_outer_text.setFont(font)
layout_outer.addWidget(self.widget_outer_text, alignment=Qt.AlignmentFlag.AlignCenter)
widget_inner_grid = QWidget()
layout_outer.addWidget(widget_inner_grid, alignment=Qt.AlignmentFlag.AlignCenter)
self.layout_inner_grid = QGridLayout(widget_inner_grid)
k = 1
for i in range(self.rows):
for j in range(self.cols):
box = QLabel(f"{k}")
self.layout_inner_grid.addWidget(box, i, j, Qt.AlignmentFlag.AlignCenter)
k += 1
self.set_num.connect(self.set_num_handler)
@Slot(int, QColor)
def set_num_handler(self, i, color):
row = int((i - 1) / self.cols)
col = (i - 1) - (row * self.cols)
widget = self.layout_inner_grid.itemAtPosition(row, col).widget()
font = QFont()
font.setWeight(QFont.Bold)
palette = QPalette()
palette.setColor(QPalette.WindowText, color)
widget.setFont(font)
widget.setPalette(palette)
class Eratosthenes(QObject):
""" This Sieve of Eratosthenes runs on a configurable tick (default
0.1 seconds). At each tick, a new subroutine will be created
that will check multiples of the next prime number. Each of
these subroutines also operates on the same tick. """
def __init__(self, num, window, tick=0.1):
super().__init__()
self.num = num
self.sieve = [True] * self.num
self.base = 0
self.window = window
self.tick = tick
self.coroutines = []
self.done = False
self.nursery = None
async def start(self):
async with trio.open_nursery() as self.nursery:
self.nursery.start_soon(self.update_text)
while self.base <= self.num / 2:
await trio.sleep(self.tick)
for i in range(self.base + 1, self.num):
if self.sieve[i]:
self.base = i
break
self.nursery.start_soon(self.mark_number, self.base + 1)
while sum(self.coroutines) > 0:
await trio.sleep(self.tick)
self.done = True
async def mark_number(self, base):
id = len(self.coroutines)
self.coroutines.append(1)
color = QColor(randint(64, 192), randint(64, 192), randint(64, 192))
for i in range(2 * base, self.num + 1, base):
if self.sieve[i - 1]:
self.sieve[i - 1] = False
self.window.set_num.emit(i, color)
await trio.sleep(self.tick)
self.coroutines[id] = 0
async def update_text(self):
while not self.done:
await trio.sleep(self.tick)
if int(trio.lowlevel.current_clock().current_time() + self.tick) % 2:
text = "⚙️ ...Calculating prime numbers... ⚙️"
else:
text = "👩💻 ...Hacking the universe... 👩💻"
self.window.widget_outer_text.setText(text)
self.window.widget_outer_text.setText(
"🥳 Congratulations! You found all the prime numbers and solved mathematics. 🥳"
)
class AsyncHelper(QObject):
class ReenterQtObject(QObject):
""" This is a QObject to which an event will be posted, allowing
Trio to resume when the event is handled. event.fn() is the
next entry point of the Trio event loop. """
def event(self, event):
if event.type() == QEvent.User + 1:
event.fn()
return True
return False
class ReenterQtEvent(QEvent):
""" This is the QEvent that will be handled by the ReenterQtObject.
self.fn is the next entry point of the Trio event loop. """
def __init__(self, fn):
super().__init__(QEvent.Type(QEvent.User + 1))
self.fn = fn
def __init__(self, worker, entry):
super().__init__()
self.reenter_qt = self.ReenterQtObject()
self.entry = entry
self.worker = worker
if hasattr(self.worker, "start_signal") and isinstance(self.worker.start_signal, Signal):
self.worker.start_signal.connect(self.launch_guest_run)
@Slot()
def launch_guest_run(self):
""" To use Trio and Qt together, one must run the Trio event
loop as a "guest" inside the Qt "host" event loop. """
if not self.entry:
raise Exception("No entry point for the Trio guest run was set.")
trio.lowlevel.start_guest_run(
self.entry,
run_sync_soon_threadsafe=self.next_guest_run_schedule,
done_callback=self.trio_done_callback,
)
def next_guest_run_schedule(self, fn):
""" This function serves to re-schedule the guest (Trio) event
loop inside the host (Qt) event loop. It is called by Trio
at the end of an event loop run in order to relinquish back
to Qt's event loop. By posting an event on the Qt event loop
that contains Trio's next entry point, it ensures that Trio's
event loop will be scheduled again by Qt. """
QApplication.postEvent(self.reenter_qt, self.ReenterQtEvent(fn))
def trio_done_callback(self, outcome_):
""" This function is called by Trio when its event loop has
finished. """
if isinstance(outcome_, outcome.Error):
error = outcome_.error
traceback.print_exception(type(error), error, error.__traceback__)
if __name__ == "__main__":
rows = 40
cols = 40
num = rows * cols
app = QApplication(sys.argv)
main_window = MainWindow(rows, cols)
eratosthenes = Eratosthenes(num, main_window)
async_helper = AsyncHelper(eratosthenes, eratosthenes.start)
# This establishes the entry point for the Trio guest run. It varies
# depending on how and when its event loop is to be triggered, e.g.,
# from the beginning (as here) or rather at a specific moment like
# a button press.
QTimer.singleShot(0, async_helper.launch_guest_run)
main_window.show()
signal.signal(signal.SIGINT, signal.SIG_DFL)
app.exec()
|