ref: ad1df2d2a01bd064e643287ff305673dfede3ce3
dir: /qview/dpp.py/
# This is an example of QView customization for a specific application
# (DPP in this case). This example animates the Phil images on the
# QView canvas. Additionally, there is a button in the middle of the screen,
# which, when clicked once pauses the DPP ("forks" are not being served).
# A second click on the button, "un-pauses" the DPP ("forks" are served
# to all hungry Philosophers).
#
# This version of the DPP customization uses the application-specific
# trace record QS_USER_00 (PHILO_STAT) produced when the status of
# a Philo changes.
class DPP:
def __init__(self):
# add commands to the Custom menu...
QView.custom_menu.add_command(label="Custom command",
command=self.cust_command)
# configure the custom QView.canvas...
QView.show_canvas() # make the canvas visible
QView.canvas.configure(width=400, height=260)
# tuple of activity images (correspond to self._philo_state)
self._act_img = (
PhotoImage(file=HOME_DIR + "/img/thinking.gif"),
PhotoImage(file=HOME_DIR + "/img/hungry.gif"),
PhotoImage(file=HOME_DIR + "/img/eating.gif"),
)
# tuple of philo canvas images (correspond to self._philo_obj)
self._philo_img = (\
QView.canvas.create_image(190, 57, image=self._act_img[0]),
QView.canvas.create_image(273, 100, image=self._act_img[0]),
QView.canvas.create_image(237, 185, image=self._act_img[0]),
QView.canvas.create_image(146, 185, image=self._act_img[0]),
QView.canvas.create_image(107, 100, image=self._act_img[0])
)
# button images for UP and DOWN
self.img_UP = PhotoImage(file=HOME_DIR + "/img/BTN_UP.gif")
self.img_DWN = PhotoImage(file=HOME_DIR + "/img/BTN_DWN.gif")
# images of a button for pause/serve
self.btn = QView.canvas.create_image(200, 120, image=self.img_UP)
QView.canvas.tag_bind(self.btn, "<ButtonPress-1>", self.cust_pause)
# request target reset on startup...
# NOTE: Normally, for an embedded application you would like
# to start with resetting the Target, to start clean with
# Qs dictionaries, etc.
reset_target()
# on_reset() callback
def on_reset(self):
# clear the lists
self._philo_obj = [0, 0, 0, 0, 0]
self._philo_state = [0, 0, 0]
# on_run() callback
def on_run(self):
glb_filter("QS_USER_00")
# NOTE: the names of objects for current_obj() must match
# the QS Object Dictionaries produced by the application.
current_obj(OBJ_AO, "Table_inst")
# turn lists into tuples for better performance
self._philo_obj = tuple(self._philo_obj)
self._philo_state = tuple(self._philo_state)
# example of a custom command
def cust_command(self):
command(1, 12345)
# example of a custom interaction with a canvas object (pause/serve)
def cust_pause(self, event):
if QView.canvas.itemcget(self.btn, "image") != str(self.img_UP):
QView.canvas.itemconfig(self.btn, image=self.img_UP)
post("SERVE_SIG")
QView.print_text("Table SERVING")
else:
QView.canvas.itemconfig(self.btn, image=self.img_DWN)
post("PAUSE_SIG")
QView.print_text("Table PAUSED")
# Intercept the QS_USER_00 application-specific trace record.
# This record has the following structure (see bsp.c:displayPhilStat()):
# Seq-Num, Record-ID, Timestamp, format-byte, Philo-num,
# format-byte, Zero-terminated string (status)
def QS_USER_00(self, packet):
# unpack: Timestamp->data[0], Philo-num->data[1], status->data[3]
data = qunpack("xxTxBxZ", packet)
i = data[1]
j = ("t", "h", "e").index(data[2][0]) # the first letter
# animate the given philo image according to its activity
QView.canvas.itemconfig(self._philo_img[i], image=self._act_img[j])
# print a message to the text view
QView.print_text("%010d Philo %1d is %s"%(data[0], i, data[2]))
#=============================================================================
QView.customize(DPP()) # set the QView customization