class MarqueeText(QScrollArea):
def __init__(self, parent=None):
QScrollArea.__init__(self)
self.setParent(parent)
self.text = ""
# Set the background colour of the marquee text to white
self.setStyleSheet("QScrollArea { background-color: rgba(255, 255, 255, 1)}")
# Initialise the base label and text
self.label = QLabel()
# Set the font for marquee
font = QFont()
font.setItalic(True)
font.setBold(True)
font.setPixelSize(25)
self.label.setFont(font)
# Set the base label as the base widget of QScrollArea
self.setWidget(self.label)
# Set QScrollBar Policies
self.setWidgetResizable(True)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
# Initialise timer and associated variables, used for marquee effect
self.timer = QTimer(self)
self.x = 0
self.speed = 0
# Connect a function to the timer, which controls the marquee effect
self.timer.timeout.connect(self.updatePos)
# TODO: Set a nominal speed
self.setSpeed(33)
def updatePos(self):
self.x = (self.x + 1) % self.label.fontMetrics().horizontalAdvance(self.text)
self.horizontalScrollBar().setValue(self.x)
def setText(self, text):
# Sets the text of the marquee label
# text: (str) the text to be displayed
# TODO: Change the separator bit when adding universal settings
self.text = text + " "
self.x = 0
# First need the widths of the current label windowspace and the text itself
windowWidth = self.window().geometry().width()
textWidth = self.label.fontMetrics().horizontalAdvance(text)
# Concatenate the text on itself as many times as needed.
self.label.setText(self.text + (self.text * (windowWidth // textWidth + (windowWidth % textWidth > 0))))
# Finally, start the timer to start the effect
self.timer.start(self.timer.interval())
def setSpeed(self, speed):
# Sets the speed of the scroll
# speed: (int) how many pixels to move per second
# Reset the timer with new interval.
self.timer.setInterval(1000 / speed)
