code.vuplus.com Git - vuplus_dvbapp/blob - components.py

   1 from enigma import *
   2 import time
   3 import sys
   4
   5 # some helper classes first:
   6 class HTMLComponent:
   7         def produceHTML(self):
   8                 return ""
   9
  10 class HTMLSkin:
  11         order = ()
  12
  13         def __init__(self, order):
  14                 self.order = order
  15
  16         def produceHTML(self):
  17                 res = "<html>\n"
  18                 for name in self.order:
  19                         res += self[name].produceHTML()
  20                 res += "</html>\n";
  21                 return res
  22
  23 class GUISkin:
  24         def __init__(self):
  25                 pass
  26
  27         def createGUIScreen(self, parent):
  28                 for (name, val) in self.items():
  29                         if isinstance(val, GUIComponent):
  30                                 val.GUIcreate(parent, None)
  31
  32         def deleteGUIScreen(self):
  33                 for (name, val) in self.items():
  34                         if isinstance(val, GUIComponent):
  35                                 val.GUIdelete()
  36                         try:
  37                                 val.fix()
  38                         except:
  39                                 pass
  40
  41                         # note: you'll probably run into this assert. if this happens, don't panic!
  42                         # yes, it's evil. I told you that programming in python is just fun, and
  43                         # suddently, you have to care about things you don't even know.
  44                         #
  45                         # but calm down, the solution is easy, at least on paper:
  46                         #
  47                         # Each Component, which is a GUIComponent, owns references to each
  48                         # instantiated eWidget (namely in screen.data[name]["instance"], in case
  49                         # you care.)
  50                         # on deleteGUIscreen, all eWidget *must* (!) be deleted (otherwise,
  51                         # well, problems appear. I don't want to go into details too much,
  52                         # but this would be a memory leak anyway.)
  53                         # The assert beyond checks for that. It asserts that the corresponding
  54                         # eWidget is about to be removed (i.e., that the refcount becomes 0 after
  55                         # running deleteGUIscreen).
  56                         # (You might wonder why the refcount is checked for 2 and not for 1 or 0 -
  57                         # one reference is still hold by the local variable 'w', another one is
  58                         # hold be the function argument to sys.getrefcount itself. So only if it's
  59                         # 2 at this point, the object will be destroyed after leaving deleteGUIscreen.)
  60                         #
  61                         # Now, how to fix this problem? You're holding a reference somewhere. (References
  62                         # can only be hold from Python, as eWidget itself isn't related to the c++
  63                         # way of having refcounted objects. So it must be in python.)
  64                         #
  65                         # It could be possible that you're calling deleteGUIscreen trough a call of
  66                         # a PSignal. For example, you could try to call screen.doClose() in response
  67                         # to a Button::click. This will fail. (It wouldn't work anyway, as you would
  68                         # remove a dialog while running it. It never worked - enigma1 just set a
  69                         # per-mainloop variable on eWidget::close() to leave the exec()...)
  70                         # That's why Session supports delayed closes. Just call Session.close() and
  71                         # it will work.
  72                         #
  73                         # Another reason is that you just stored the data["instance"] somewhere. or
  74                         # added it into a notifier list and didn't removed it.
  75                         #
  76                         # If you can't help yourself, just ask me. I'll be glad to help you out.
  77                         # Sorry for not keeping this code foolproof. I really wanted to archive
  78                         # that, but here I failed miserably. All I could do was to add this assert.
  79 #                       assert sys.getrefcount(w) == 2, "too many refs hold to " + str(w)
  80
  81         def close(self):
  82                 self.deleteGUIScreen()
  83
  84 class GUIComponent:
  85         """ GUI component """
  86
  87         def __init__(self):
  88                 pass
  89
  90         def execBegin(self):
  91                 pass
  92
  93         def execEnd(self):
  94                 pass
  95
  96 class VariableText:
  97         """VariableText can be used for components which have a variable text, based on any widget with setText call"""
  98
  99         def __init__(self):
 100                 self.message = ""
 101                 self.instance = None
 102
 103         def setText(self, text):
 104                 self.message = text
 105                 if self.instance:
 106                         self.instance.setText(self.message)
 107
 108         def getText(self):
 109                 return self.message
 110
 111         def GUIcreate(self, parent, skindata):
 112                 self.instance = self.createWidget(parent, skindata)
 113                 self.instance.setText(self.message)
 114
 115         def GUIdelete(self):
 116                 self.removeWidget(self.instance)
 117                 del self.instance
 118
 119         def removeWidget(self, instance):
 120                 pass
 121
 122 class VariableValue:
 123         """VariableValue can be used for components which have a variable value (like eSlider), based on any widget with setValue call"""
 124
 125         def __init__(self):
 126                 self.value = 0
 127                 self.instance = None
 128
 129         def setValue(self, value):
 130                 self.value = value
 131                 if self.instance:
 132                         self.instance.setValue(self.value)
 133
 134         def getValue(self):
 135                 return self.value
 136
 137         def GUIcreate(self, parent, skindata):
 138                 self.instance = self.createWidget(parent, skindata)
 139                 self.instance.setValue(self.value)
 140
 141         def GUIdelete(self):
 142                 self.removeWidget(self.instance)
 143                 del self.instance
 144
 145         def removeWidget(self, instance):
 146                 pass
 147
 148 # now some "real" components:
 149
 150 class Clock(HTMLComponent, GUIComponent, VariableText):
 151         def __init__(self):
 152                 VariableText.__init__(self)
 153                 GUIComponent.__init__(self)
 154                 self.doClock()
 155
 156                 self.clockTimer = eTimer()
 157                 self.clockTimer.timeout.get().append(self.doClock)
 158                 self.clockTimer.start(1000)
 159
 160 # "funktionalitaet"
 161         def doClock(self):
 162                 self.setText("clock: " + time.asctime())
 163
 164 # realisierung als GUI
 165         def createWidget(self, parent, skindata):
 166                 return eLabel(parent)
 167
 168         def removeWidget(self, w):
 169                 del self.clockTimer
 170
 171 # ...und als HTML:
 172         def produceHTML(self):
 173                 return self.getText()
 174
 175 class Button(HTMLComponent, GUIComponent, VariableText):
 176         def __init__(self, text="", onClick = [ ]):
 177                 GUIComponent.__init__(self)
 178                 VariableText.__init__(self)
 179                 self.setText(text)
 180                 self.onClick = onClick
 181
 182         def push(self):
 183                 for x in self.onClick:
 184                         x()
 185                 return 0
 186
 187         def disable(self):
 188 #               self.instance.hide()
 189                 pass
 190
 191         def enable(self):
 192 #               self.instance.show()
 193                 pass
 194
 195 # html:
 196         def produceHTML(self):
 197                 return "<input type=\"submit\" text=\"" + self.getText() + "\">\n"
 198
 199 # GUI:
 200         def createWidget(self, parent, skindata):
 201                 g = eButton(parent)
 202                 g.selected.get().append(self.push)
 203                 return g
 204
 205         def removeWidget(self, w):
 206                 w.selected.get().remove(self.push)
 207
 208 class Label(HTMLComponent, GUIComponent, VariableText):
 209         def __init__(self, text=""):
 210                 GUIComponent.__init__(self)
 211                 VariableText.__init__(self)
 212                 self.setText(text)
 213
 214 # html:
 215         def produceHTML(self):
 216                 return self.getText()
 217
 218 # GUI:
 219         def createWidget(self, parent, skindata):
 220                 return eLabel(parent)
 221
 222 class Header(HTMLComponent, GUIComponent, VariableText):
 223
 224         def __init__(self, message):
 225                 GUIComponent.__init__(self)
 226                 VariableText.__init__(self)
 227                 self.setText(message)
 228
 229         def produceHTML(self):
 230                 return "<h2>" + self.getText() + "</h2>\n"
 231
 232         def createWidget(self, parent, skindata):
 233                 g = eLabel(parent)
 234                 return g
 235
 236 class VolumeBar(HTMLComponent, GUIComponent, VariableValue):
 237
 238         def __init__(self):
 239                 GUIComponent.__init__(self)
 240                 VariableValue.__init__(self)
 241
 242         def createWidget(self, parent, skindata):
 243                 g = eSlider(parent)
 244                 g.setRange(0, 100)
 245                 return g
 246
 247 # a general purpose progress bar
 248 class ProgressBar(HTMLComponent, GUIComponent, VariableValue):
 249         def __init__(self):
 250                 GUIComponent.__init__(self)
 251                 VariableValue.__init__(self)
 252
 253         def createWidget(self, parent, skindata):
 254                 g = eSlider(parent)
 255                 g.setRange(0, 100)
 256                 return g
 257
 258 class MenuList(HTMLComponent, GUIComponent):
 259         def __init__(self, list):
 260                 GUIComponent.__init__(self)
 261                 self.l = eListboxPythonStringContent()
 262                 self.l.setList(list)
 263
 264         def getCurrent(self):
 265                 return self.l.getCurrentSelection()
 266
 267         def GUIcreate(self, parent, skindata):
 268                 self.instance = eListbox(parent)
 269                 self.instance.setContent(self.l)
 270
 271         def GUIdelete(self):
 272                 self.instance.setContent(None)
 273
 274 class ServiceList(HTMLComponent, GUIComponent):
 275         def __init__(self):
 276                 GUIComponent.__init__(self)
 277                 self.l = eListboxServiceContent()
 278
 279         def getCurrent(self):
 280                 r = eServiceReference()
 281                 self.l.getCurrent(r)
 282                 return r
 283
 284         def GUIcreate(self, parent, skindata):
 285                 self.instance = eListbox(parent)
 286                 self.instance.setContent(self.l)
 287
 288         def GUIdelete(self):
 289                 del self.instance
 290
 291         def setRoot(self, root):
 292                 self.l.setRoot(root)
 293
 294 class ServiceScan:
 295
 296         Idle = 1
 297         Running = 2
 298         Done = 3
 299         Error = 4
 300
 301         def scanStatusChanged(self):
 302                 if self.state == self.Running:
 303                         self.progressbar.setValue(self.scan.getProgress())
 304                         if self.scan.isDone():
 305                                 self.state = self.Done
 306                         else:
 307                                 self.text.setText("scan in progress - %d %% done!\n%d services found!" % (self.scan.getProgress(), self.scan.getNumServices()))
 308
 309                 if self.state == self.Done:
 310                         self.text.setText("scan done!")
 311
 312                 if self.state == self.Error:
 313                         self.text.setText("ERROR - failed to scan!")
 314
 315         def __init__(self, progressbar, text):
 316                 self.progressbar = progressbar
 317                 self.text = text
 318                 self.scan = eComponentScan()
 319                 if self.scan.start():
 320                         self.state = self.Error
 321                 else:
 322                         self.state = self.Running
 323                 self.scan.statusChanged.get().append(self.scanStatusChanged)
 324                 self.scanStatusChanged()
 325
 326         def isDone(self):
 327                 return self.state == self.Done
 328
 329         def fix(self):
 330                 self.scan.statusChanged.get().remove(self.scanStatusChanged)
 331
 332 class ActionMap:
 333         def __init__(self, context, actions = { }, prio=0):
 334                 self.actions = actions
 335                 self.context = context
 336                 self.prio = prio
 337                 self.p = eActionMapPtr()
 338                 eActionMap.getInstance(self.p)
 339
 340         def execBegin(self):
 341                 self.p.bindAction(self.context, self.prio, self.action)
 342
 343         def execEnd(self):
 344                 self.p.unbindAction(self.context, self.action)
 345
 346         def action(self, context, action):
 347                 try:
 348                         self.actions[action]()
 349                 except KeyError:
 350                         print "unknown action %s/%s! typo in keymap?" % (context, action)
 351
 352 class PerServiceDisplay(GUIComponent, VariableText):
 353         """Mixin for building components which display something which changes on navigation events, for example "service name" """
 354
 355         def __init__(self, navcore, eventmap):
 356                 GUIComponent.__init__(self)
 357                 VariableText.__init__(self)
 358                 self.eventmap = eventmap
 359                 navcore.m_event.get().append(self.event)
 360                 self.navcore = navcore
 361
 362                 # start with stopped state, so simulate that
 363                 self.event(pNavigation.evStopService)
 364
 365         def event(self, ev):
 366                 # loop up if we need to handle this event
 367                 if self.eventmap.has_key(ev):
 368                         # call handler
 369                         self.eventmap[ev]()
 370
 371         def createWidget(self, parent, skindata):
 372                 # by default, we use a label to display our data.
 373                 g = eLabel(parent)
 374                 return g
 375
 376 class EventInfo(PerServiceDisplay):
 377         Now = 0
 378         Next = 1
 379         def __init__(self, navcore, now_or_next):
 380                 # listen to evUpdatedEventInfo and evStopService
 381                 # note that evStopService will be called once to establish a known state
 382                 PerServiceDisplay.__init__(self, navcore,
 383                         {
 384                                 pNavigation.evUpdatedEventInfo: self.ourEvent,
 385                                 pNavigation.evStopService: self.stopEvent
 386                         })
 387                 self.now_or_next = now_or_next
 388
 389         def ourEvent(self):
 390                 info = iServiceInformationPtr()
 391                 service = iPlayableServicePtr()
 392
 393                 if not self.navcore.getCurrentService(service):
 394                         if not service.info(info):
 395                                 print "got info !"
 396                                 ev = eServiceEventPtr()
 397                                 info.getEvent(ev, self.now_or_next)
 398                                 self.setText(ev.m_event_name)
 399                 print "new event info in EventInfo! yeah!"
 400
 401         def stopEvent(self):
 402                         self.setText("waiting for event data...");
 403
 404 class ServiceName(PerServiceDisplay):
 405         def __init__(self, navcore):
 406                 PerServiceDisplay.__init__(self, navcore,
 407                         {
 408                                 pNavigation.evNewService: self.newService,
 409                                 pNavigation.evStopService: self.stopEvent
 410                         })
 411
 412         def newService(self):
 413                 info = iServiceInformationPtr()
 414                 service = iPlayableServicePtr()
 415
 416                 if not self.navcore.getCurrentService(service):
 417                         if not service.info(info):
 418                                 self.setText("no name known, but it should be here :)")
 419
 420         def stopEvent(self):
 421                         self.setText("");