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104 lines
4.2 KiB
Python
104 lines
4.2 KiB
Python
# This is an example of QView customization for a specific application
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# (DPP in this case). This example animates the Phil images on the
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# QView canvas. Additionally, there is a button in the middle of the screen,
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# which, when clicked once pauses the DPP ("forks" are not being served).
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# A second click on the button, "un-pauses" the DPP ("forks" are served
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# to all hungry Philosophers).
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#
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# This version of the DPP customization uses the application-specific
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# packet QS_USER_00 (PHILO_STAT) produced when the status of a Philo changes.
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#
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class DPP:
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def __init__(self):
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# add commands to the Custom menu...
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QView.custom_menu.add_command(label="Custom command",
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command=self.cust_command)
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# configure the custom QView.canvas...
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QView.show_canvas() # make the canvas visible
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QView.canvas.configure(width=400, height=260)
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# tuple of activity images (correspond to self._philo_state)
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self._act_img = (
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PhotoImage(file=HOME_DIR + "/img/thinking.gif"),
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PhotoImage(file=HOME_DIR + "/img/hungry.gif"),
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PhotoImage(file=HOME_DIR + "/img/eating.gif"),
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)
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# tuple of philo canvas images (correspond to self._philo_obj)
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self._philo_img = (\
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QView.canvas.create_image(190, 57, image=self._act_img[0]),
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QView.canvas.create_image(273, 100, image=self._act_img[0]),
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QView.canvas.create_image(237, 185, image=self._act_img[0]),
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QView.canvas.create_image(146, 185, image=self._act_img[0]),
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QView.canvas.create_image(107, 100, image=self._act_img[0])
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)
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# button images for UP and DOWN
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self.img_UP = PhotoImage(file=HOME_DIR + "/img/BTN_UP.gif")
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self.img_DWN = PhotoImage(file=HOME_DIR + "/img/BTN_DWN.gif")
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# images of a button for pause/serve
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self.btn = QView.canvas.create_image(200, 120, image=self.img_UP)
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QView.canvas.tag_bind(self.btn, "<ButtonPress-1>", self.cust_pause)
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# request target reset on startup...
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# NOTE: Normally, for an embedded application you would like
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# to start with resetting the Target, to start clean with
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# Qs dictionaries, etc.
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reset_target()
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# on_reset() callback
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def on_reset(self):
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# clear the lists
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self._philo_obj = [0, 0, 0, 0, 0]
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self._philo_state = [0, 0, 0]
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# on_run() callback
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def on_run(self):
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glb_filter("QS_USER_00")
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# NOTE: the name of object for current_obj() must match the
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# QS Object Dictionaries produced by the application.
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current_obj(OBJ_AO, "Table::inst")
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# turn lists into tuples for better performance
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self._philo_obj = tuple(self._philo_obj)
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self._philo_state = tuple(self._philo_state)
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# example of a custom command
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def cust_command(self):
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command(1, 12345)
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# example of a custom interaction with a canvas object (pause/serve)
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def cust_pause(self, event):
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if QView.canvas.itemcget(self.btn, "image") != str(self.img_UP):
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QView.canvas.itemconfig(self.btn, image=self.img_UP)
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post("SERVE_SIG")
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QView.print_text("Table SERVING")
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else:
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QView.canvas.itemconfig(self.btn, image=self.img_DWN)
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post("PAUSE_SIG")
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QView.print_text("Table PAUSED")
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# intercept the QS_USER_00 application-specific packet
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# this packet has the following structure (see bsp.c:displayPhilStat()):
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# record-ID, seq-num, Timestamp, format-byte, Philo-num,
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# format-bye, Zero-terminated string (status)
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def QS_USER_00(self, packet):
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# unpack: Timestamp->data[0], Philo-num->data[1], status->data[3]
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data = qunpack("xxTxBxZ", packet)
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i = data[1]
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j = ("t", "h", "e").index(data[2][0]) # the first letter
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# animate the given philo image according to its activity
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QView.canvas.itemconfig(self._philo_img[i], image=self._act_img[j])
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# print a message to the text view
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QView.print_text("%010d Philo %1d is %s"%(data[0], i, data[2]))
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#=============================================================================
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QView.customize(DPP()) # set the QView customization
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