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import sys
import reactivex
from reactivex import operators as ops
from reactivex.scheduler.mainloop import QtScheduler
from reactivex.subject import Subject
try:
from PySide2 import QtCore
from PySide2.QtWidgets import QApplication, QLabel, QWidget
except ImportError:
try:
from PyQt5 import QtCore
from PyQt5.QtWidgets import QApplication, QLabel, QWidget
except ImportError:
raise ImportError("Please ensure either PySide2 or PyQt5 is available!")
class Window(QWidget):
def __init__(self):
QWidget.__init__(self)
self.setWindowTitle("Rx for Python rocks")
self.resize(600, 600)
self.setMouseTracking(True)
# This Subject is used to transmit mouse moves to labels
self.mousemove = Subject()
def mouseMoveEvent(self, event):
self.mousemove.on_next((event.x(), event.y()))
def main():
app = QApplication(sys.argv)
scheduler = QtScheduler(QtCore)
window = Window()
window.show()
text = "TIME FLIES LIKE AN ARROW"
def on_next(info):
label, (x, y), i = info
label.move(x + i * 12 + 15, y)
label.show()
def handle_label(label, i):
delayer = ops.delay(i * 0.100)
mapper = ops.map(lambda xy: (label, xy, i))
return window.mousemove.pipe(
delayer,
mapper,
)
labeler = ops.flat_map_indexed(handle_label)
mapper = ops.map(lambda c: QLabel(c, window))
reactivex.from_(text).pipe(
mapper,
labeler,
).subscribe(on_next, on_error=print, scheduler=scheduler)
sys.exit(app.exec_())
if __name__ == "__main__":
main()
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