a taurus-ified QLabel accepting 2 models

taurus_label_2models.py

import sys
import taurus
from taurus.external.qt import Qt
from taurus.qt.qtgui.application import TaurusApplication
from taurus.qt.qtgui.base import TaurusBaseComponent


class MyLabel(Qt.QLabel, TaurusBaseComponent):
    """A taurus-ified QLabel that sums 2 attributes"""

    def __init__(self, parent=None):
        # call the parent class init
        Qt.QLabel.__init__(self, "waiting...", parent=parent)
        TaurusBaseComponent.__init__(self, "MyLabel")
        self.setMinimumWidth(100)

    def setModel(self, models):
        m1,m2 = models
        self._m1=taurus.Attribute(m1)
        self._m2=taurus.Attribute(m2)
        self._m1.addListener(self)
        self._m2.addListener(self)

    def handleEvent(self, evt_src, evt_type, evt_val):
        """reimplemented from TaurusBaseComponent
        """
        # TaurusBaseComponent.handleEvent does nothing, so no need to call it

        self.setText("{}".format(self._m1.read().rvalue + self._m2.read().rvalue))


if __name__ == "__main__":

    # Initialize a Qt application (Qt will crash if you do not do this first)
    app = TaurusApplication()

    # instantiate the widget
    w = MyLabel()

    model1 = "eval:rand()" 
    model2 = "eval:10+rand()"
    w.setModel((model1, model2))

    # show it (if you do not show the widget, it won't be visible)
    w.show()

    # Initialize the Qt event loop (and exit when we close the app)
    sys.exit(app.exec_())