sface/mainwindow.py

   1 import os, os.path
   2 import sys
   3 import time
   4 import traceback
   5
   6 from PyQt4.QtCore import *
   7 from PyQt4.QtGui import *
   8
   9 import sface.screens
  10 from sface.config import config
  11 from sface.logwindow import LogWindow
  12 from sface.rspecwindow import RSpecWindow
  13 from sface.screens.sfascreen import SfaScreen
  14
  15 # depending on the platform..
  16 # could probably use Qt's resource system but looks overkill for just one file...
  17 def locate_image_file (filename):
  18     for dir in [ '/usr/share', '/Applications/sface.app/Contents/Resources/sface' ] :
  19         for suffix in ['png','jpg']:
  20             attempt=os.path.join(dir,'images',"%s.%s"%(filename,suffix))
  21             if os.path.isfile(attempt) : return attempt
  22     return os.path.join('/could/not/locate/image/file',filename)
  23
  24 def load_screens(dirname):
  25     modnames = []
  26     for fn in os.listdir(dirname):
  27         if not fn.endswith(".py"):
  28             continue
  29         modname = fn.rsplit(".py",1)[0]
  30         if modname == "sfascreen":
  31             # ignore this, it's the base class, not a screen
  32             continue
  33         modnames.append(modname)
  34
  35     # we want the stock screens to show up in a specific order. plugins can
  36     # show up in any order afterward.
  37
  38     sort_order = ["mainscreen", "configscreen", "helpscreen"]
  39     sort_order.reverse()
  40     for modname in sort_order:
  41         if modname in modnames:
  42             modnames.remove(modname)
  43             modnames.insert(0,modname)
  44
  45     # import each module and find whatever class(es) is descendant from
  46     # SfaScreen within the module. Might be a better idea to just define a
  47     # screens=[] variable in each module
  48
  49     screens = []
  50     for modname in modnames:
  51         try:
  52             mod = __import__("sface.screens." + modname, fromlist=["modname"])
  53         except:
  54             print "Exception while importing screen", modname
  55             traceback.print_exc()
  56             continue
  57
  58         for object in dir(mod):
  59             object = getattr(mod, object)
  60             if hasattr(object, "__bases__") and sface.screens.sfascreen.SfaScreen in object.__bases__:
  61                 screens.append(object)
  62
  63     return screens
  64
  65 class Nav(QWidget):
  66     def __init__(self, screens, parent=None):
  67         QWidget.__init__(self, parent)
  68
  69         self.title = QLabel("", self)
  70         scene=QGraphicsScene()
  71         pixmap = QPixmap(locate_image_file('graphic-sfa64'))
  72         logolabel=QLabel("",self)
  73         logolabel.setPixmap(pixmap)
  74
  75         hlayout = QHBoxLayout()
  76         hlayout.addWidget(logolabel)
  77         hlayout.addWidget(self.title)
  78         hlayout.addStretch()
  79         gotolabel=QLabel("Go to: ", self)
  80         gotolabel.setAlignment(Qt.AlignRight)
  81         hlayout.addWidget(gotolabel)
  82
  83         self.screenLabels = []
  84         for screen in screens:
  85             label = QLabel(screen.getLinkText(), self)
  86             label.setAlignment(Qt.AlignRight)
  87             self.screenLabels.append(label)
  88             hlayout.addWidget(label)
  89
  90         self.setLayout(hlayout)
  91
  92     def setTitle(self, title):
  93         self.title.setText(title)
  94
  95
  96 class Status(QLabel):
  97     def __init__(self, parent=None):
  98         QLabel.__init__(self, "", parent)
  99         self.sliceUpdateDate()
 100
 101     def set(self, msg, timeout):
 102         self.setText(msg)
 103         if timeout:
 104             QTimer.singleShot(timeout, self.reset)
 105
 106     def sliceUpdateDate(self):
 107         rspec_file = config.getSliceRSpecFile()
 108         if not os.path.exists(rspec_file):
 109             return
 110
 111         creation_time = os.stat(rspec_file).st_ctime
 112         last_update = time.ctime(creation_time)
 113         self.set("Slice data last refreshed on %s" % last_update, timeout=None)
 114
 115     def reset(self):
 116         self.setText("")
 117         QTimer.singleShot(1500, self.sliceUpdateDate)
 118
 119
 120 class MainWindow(QWidget):
 121     def __init__(self, parent=None):
 122         QWidget.__init__(self, parent)
 123
 124         # These are top-level windows and should be initialized with parent set
 125         # to our parent. Otherwise, getting a segfault on exit in Ubuntu.
 126         self.logWindow = LogWindow(parent)
 127         self.rspecWindow = RSpecWindow(parent)
 128
 129         self.pix = QLabel(self)
 130
 131         screenClasses = load_screens(os.path.dirname(sface.screens.__file__))
 132         self.screenWidgets = []
 133
 134         self.screens = QStackedWidget(self)
 135         for screen in screenClasses:
 136             # use a try/catch block to isolate the screen. Third-party plugins
 137             # could be buggy.
 138             try:
 139                 screenWidget = screen(self)
 140                 self.screenWidgets.append(screenWidget)
 141                 self.screens.addWidget(screenWidget)
 142             except:
 143                 print "Exception while creating screen", screen.__name__
 144                 traceback.print_exc()
 145
 146         self.screens.addWidget(self.pix)
 147         self.next_screen = None
 148
 149         self.nav = Nav(self.screenWidgets, self)
 150
 151         if self.screenWidgets:
 152             self.nav.setTitle(self.screenWidgets[0].getTitleText())
 153
 154         self.status = Status(self)
 155         self.log = QLabel("<a href='showlog'>Show Log</a>", self)
 156         self.rspec = QLabel("<a href='showlog'>Show RSpec</a>", self)
 157
 158         hlayout = QHBoxLayout()
 159         hlayout.addWidget(self.status)
 160         hlayout.addStretch()
 161         hlayout.addWidget(self.rspec)
 162         hlayout.addWidget(self.log)
 163
 164         layout = QVBoxLayout()
 165         layout.addWidget(self.nav)
 166         layout.addWidget(self.screens)
 167         layout.addLayout(hlayout)
 168         self.setLayout(layout)
 169         self.resize(800, 500)
 170
 171         for link in self.nav.screenLabels:
 172             self.connect(link, SIGNAL('linkActivated(QString)'),
 173                          self.animateToScreen)
 174
 175         self.connect(self.log, SIGNAL('linkActivated(QString)'),
 176                      self.showLogWindow)
 177         self.connect(self.rspec, SIGNAL('linkActivated(QString)'),
 178                      self.showRSpecWindow)
 179
 180     def redirectOutputToLog(self):
 181         self.logWindow.redirectOutput()
 182
 183     def showLogWindow(self, link):
 184         self.logWindow.show()
 185         self.logWindow.resize(800, 200)
 186         self.logWindow.raise_()
 187         self.logWindow.activateWindow()
 188
 189     def showRSpecWindow(self, link):
 190         self.rspecWindow.show()
 191         self.rspecWindow.resize(500, 640)
 192         self.rspecWindow.raise_()
 193         self.rspecWindow.activateWindow()
 194
 195
 196     def animatePixmap(self, y):
 197         self.pix.move(0, y)
 198
 199     def animateToScreen(self, link):
 200         for screen in self.screenWidgets:
 201             if link == screen.name:
 202                 self.next_screen = screen
 203
 204         curr_screen = self.screens.currentWidget()
 205
 206         if self.next_screen == curr_screen:
 207             self.setStatus("Already showing %s" % curr_screen.getTitleText(), timeout=1000)
 208             return
 209
 210         # This is an optimization to have a smoother animation. We
 211         # render the widget into a pixmap and animate that instead of
 212         # moving the whole widget around.
 213         pixmap = QPixmap(self.screens.size())
 214         curr_screen.render(pixmap)
 215         self.screens.setCurrentWidget(self.pix)
 216         self.pix.setPixmap(pixmap)
 217
 218         timeLine = QTimeLine(500, self)
 219         timeLine.setFrameRange(0, self.screens.height());
 220         self.connect(timeLine, SIGNAL('frameChanged(int)'), self.animatePixmap)
 221         self.connect(timeLine, SIGNAL('finished()'), self.toNextScreen)
 222         timeLine.start()
 223
 224
 225     def toNextScreen(self):
 226         self.screens.setCurrentWidget(self.next_screen)
 227         self.nav.setTitle(self.next_screen.getTitleText())
 228
 229     def setStatus(self, msg, timeout):
 230         self.status.set(msg, timeout)
 231
 232     def nodeSelectionChanged(self, hostname):
 233         if self.rspecWindow.isVisible():
 234             self.rspecWindow.showNode(hostname)
 235
 236     def closeEvent(self, event):
 237         # give the screens an opportunity to veto the close
 238         for screen in self.screenWidgets:
 239             if not screen.canClose():
 240                 event.ignore()
 241                 return
 242
 243         # give the screens an opportunity to close gracefully
 244         for screen in self.screenWidgets:
 245             screen.mainWindowClose()
 246
 247         QWidget.closeEvent(self, event)
 248