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# Copyright (C) 2010, Daniel Popowich <danielpopowich@gmail.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# for desktop
import pyjd
# ui imports
from pyjamas.ui.HTML import HTML
from pyjamas.ui.RootPanel import RootPanel
from pyjamas.ui.Button import Button
from pyjamas.ui.DialogBox import DialogBox
from pyjamas.ui.Grid import Grid
from pyjamas.ui.HorizontalSlider import HorizontalSlider
from pyjamas.ui.Label import Label
from pyjamas.ui.HorizontalPanel import HorizontalPanel
from pyjamas.ui.SimplePanel import SimplePanel
from pyjamas.ui.CaptionPanel import CaptionPanel
# other pyjamas imports
from pyjamas import DOM
# pyjamas client-side library
from random import random
from datetime import datetime
# Timer class
from pyjamas.Timer import Timer
######################################################################
# The next three classes demonstrate three ways to create/use timers
######################################################################
class Clock:
# pyjamas doesn't generate __doc__
__doc__ = '''This demonstrates using Timer instantiated with the
notify keyword, as in:<pre> timer = Timer(notify=func) </pre>When
the timer fires it will call func() with no arguments (or
<code>self</code> if it is a bound method as in this example).
This timer is scheduled with the <code>scheduleRepeating()</code>
method, so after func() is called, it is automatically rescheduled
to fire again after the specified period. The timer can be
cancelled by calling the <code>cancel()</code> method; this
happens when you click on the button.
'''
start_txt = 'Click to start the clock'
stop_txt = 'Click to stop the clock'
def __init__(self):
# the button
self.button = Button(listener=self)
# set an attr on the button to keep track of its state
self.button.stop = False
# date label
self.datelabel = Label(StyleName='clock')
# the timer
self.timer = Timer(notify=self.updateclock)
# kick start
self.onClick(self.button)
def onClick(self, button):
if self.button.stop:
# we're stopping the clock
self.button.stop = False
self.timer.cancel()
self.button.setText(self.start_txt)
else:
# we're starting the clock
self.button.stop = True
self.timer.scheduleRepeating(1000)
self.button.setText(self.stop_txt)
def updateclock(self, timer):
# the callable attached to the timer with notify
dt = datetime.now().replace(microsecond=0)
self.datelabel.setText(dt.isoformat(' '))
class PopupTimerButton(Timer, Button):
__doc__ = '''The timer in this demo is a subclass of Timer which
implements the <code>run()</code> method. Worth noting in this
example is the use of the method <code>schedule()</code> at the
end of <code>run()</code> (contrast this to the use of
<code>scheduleRepeating()</code> in the previous example). In this
demo when the timer counts down to zero it creates a popup which
will appear in the box to the left. The timer can be cancelled by
clicking the button before it reaches zero.
'''
def __init__(self, countdown):
# It's a Timer, no it's a Button, WAIT! It's BOTH!!
Timer.__init__(self)
Button.__init__(self)
# save the countdown value
self.countdown_save = countdown
# this instance handles the clicks
self.addClickListener(self)
# the box the popups go into
self.box = SimplePanel(StyleName='popupbox')
# kickstart
self.reset()
def run(self):
# When subclassing, we just implement the run method
# update the countdown
self.setHTML('Popup in <b>%d</b> seconds! (Click to cancel)'
% self.countdown)
# reschdule if we're not to zero else create the popup
self.countdown -= 1
if self.countdown >= 0:
self.schedule(1000)
else:
self.create_popup()
self.reset()
def reset(self):
# reset to starting state
self.setHTML('Click for countdown popup')
self.countdown = self.countdown_save
self.start = True
def onClick(self, *arg):
# handle button clicks
# are we cancelling?
if not self.start:
self.cancel()
self.reset()
return
# no we're starting
self.start = False
self.schedule(1)
def create_popup(self):
# create the popup in the middle box
popup = DialogBox(False, False)
popup.onClick = lambda w: popup.hide()
popup.setHTML('<b>Hello!</b>')
popup.setWidget(Button('Close', popup))
x = self.box.getAbsoluteLeft() + random()*100
y = self.box.getAbsoluteTop() + random()*100
popup.setPopupPosition(x, y)
popup.show()
class RandomColor:
__doc__ = '''This last example demonstrates what most pyjamas
programmers currently do with timers: create a Timer instance
specifying <code>notify</code> with an object that has an
<code>onTimer</code> attribute that is callable. The slider on
the left will adjust how often the middle panel changes color; it
is either OFF or a value of seconds from 1 to 5. Changing the
slider immediately cancels the current timer and starts a new
timer to change the color in the newly specified time. Like the
previous example, this timer reschedules itself (if it wasn't
turned off) at the end of the call to <code>onTimer()</code>.
'''
def __init__(self):
# create the label and slider
self.__label = Label('OFF')
self.slider = slider = HorizontalSlider(0, 5, step=1,
StyleName="slider")
slider.setDragable(True)
slider.addControlValueListener(self)
# put them in a hpanel
self.hpanel = hpanel = HorizontalPanel(Spacing=10)
hpanel.add(slider)
hpanel.add(self.__label)
# create the color panel and give it color
self.colorpanel = CaptionPanel('Color:',
SimplePanel(StyleName='colorpanel'))
self.randomcolor()
# we're initially off
self.value = 0
# create our timer
self.timer = Timer(notify=self)
def initialize(self):
# this method solves an apparent bug with the slider: the
# slider doesn't draw its handle if the position is set before
# showing, so instead of doing this in __init__ (where I
# originally had it), this method gets called after it is
# shown on the root panel. See below when it gets called.
self.slider.setValue(self.value)
self.slider.setControlPos(self.value)
def onTimer(self, timer):
# when the timer fires we randomize the color and (maybe)
# reschedule ourselves.
self.randomcolor()
v = self.value * 1000
if v:
self.timer.schedule(v)
def onControlValueChanged(self, sender, old, new):
# event handler for when the slider is moved.
if new == self.value:
return
self.value = new
# is it being turned off?
if new == 0:
self.__label.setText('OFF')
self.timer.cancel()
else:
# no it's being reset
self.__label.setText(str(new) + ' sec')
self.onTimer(self.timer)
def randomcolor(self):
# randomize the color and set the panel accordingly
r = random()*256
g = random()*256
b = random()*256
e = self.colorpanel.getWidget().getElement()
color = '#%02x%02x%02x' % (r, g, b)
self.colorpanel.setCaption('Color: %s' % color)
DOM.setStyleAttribute(e, "background", color)
######################################################################
# The app
######################################################################
class timerdemo:
def __init__(self):
# layed out in a grid with odd rows a different color for
# visual separation
grid = Grid(4,3,CellPadding=50,CellSpacing=0)
rf = grid.getRowFormatter()
rf.setStyleName(1, 'oddrow')
rf.setStyleName(3, 'oddrow')
# the clock
clock = Clock()
grid.setWidget(0, 0, CaptionPanel('Using notify()', clock.button, StyleName='left'))
grid.setWidget(0, 1, clock.datelabel)
grid.setWidget(0, 2, HTML(Clock.__doc__, StyleName='desc'))
# popup timer buttons
ptb = PopupTimerButton(5)
grid.setWidget(1, 0, CaptionPanel('Subclassing Timer()', ptb, StyleName='left'))
grid.setWidget(1, 1, ptb.box)
grid.setWidget(1, 2, HTML(PopupTimerButton.__doc__, StyleName='desc'))
# the second instance
ptb = PopupTimerButton(15)
grid.setWidget(2, 0, CaptionPanel('Subclassing Timer()&nbsp;&nbsp;(<em>again</em>)',
ptb, StyleName='left'))
grid.setWidget(2, 1, ptb.box)
grid.setWidget(2, 2, HTML('''This is the same as the previous
example and is here to demonstrate
creating multiple timers (each with
their own state) which is difficult
to do without sublcassing''', StyleName='desc'))
# random color
randomcolor = RandomColor()
grid.setWidget(3, 0, CaptionPanel('Using onTimer()', randomcolor.hpanel, StyleName='left'))
grid.setWidget(3, 1, randomcolor.colorpanel)
grid.setWidget(3, 2, HTML(RandomColor.__doc__, StyleName='desc'))
# add it all to the root panel
RootPanel().add(grid)
# kickstart the slider handle (see above concerning a
# potential bug)
randomcolor.initialize()
def onModuleLoad():
timerdemo()
if __name__ == '__main__':
pyjd.setup("public/timerdemo.html")
onModuleLoad()
pyjd.run()
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