def add_output(self, name='output', multi_port=False, display_name=True):
"""
Args:
name (str): name for the port.
multi_port (bool): allow multiple connections.
display_name (bool): display the port name.
Returns:
PortItem: output item widget
"""
port = PortItem(self)
port.name = name
port.port_type = OUT_PORT
port.multi_connection = multi_port
port.display_name = display_name
text = QGraphicsTextItem(port.name, self)
text.font().setPointSize(8)
text.setFont(text.font())
text.setVisible(display_name)
self._output_items[port] = text
if self.scene():
self.post_init()
return port
class ScaleLine:
def __init__(self,
parent,
color,
text_color,
text_start="",
margins=(0, 0, 0, 0),
dp=1,
is_upload=False):
self._parent = parent
self._color = color
self._text_color = text_color
self._text_start = text_start
self._left, self._top, self._right, self._bottom = margins
self._dp = dp
self._is_upload = is_upload
self._line = QGraphicsLineItem(self._parent)
self._line.setZValue(12)
pen = QPen(self._color)
pen.setWidth(1)
pen.setStyle(Qt.DashLine)
self._line.setPen(pen)
if not self._is_upload:
self._text_item = QGraphicsTextItem(self._parent)
self._text_item.setZValue(11)
self._text_item.setDefaultTextColor(self._text_color)
font = self._text_item.font()
font_size = 10 * self._dp
if font_size > 0:
self._text_item.setFont(QFont(font.family(), font_size))
def set_line(self, max_value=0, resize=False):
height = self._parent.size().height() + self._top + self._bottom
shift = int(height - height / 1.1)
y = -self._top + shift
if not self._is_upload:
value = 0
max_value = int(max_value / 1.1)
megabyte = 1024 * 1024
if max_value > megabyte:
value = "{} MB".format(round(max_value / megabyte, 1))
elif max_value > 1024:
max_value //= 1024
if max_value >= 10:
max_value = max_value // 10 * 10
value = "{} KB".format(max_value)
elif max_value > 0:
if max_value >= 10:
max_value = max_value // 10 * 10
value = "{} B".format(max_value)
scale_text = self._text_start if not value \
else "{}{}/s".format(self._text_start, value)
font_height = QFontMetrics(self._text_item.font())\
.boundingRect(scale_text).height()
x = 10
self._text_item.setPos(x, y - font_height - 10)
self._text_item.setPlainText(scale_text)
if not resize:
return
self._line.setLine(QLineF(0, y, self._parent.size().width() + 30, y))
