Source

orange / Orange / OrangeCanvas / orngCanvas.pyw

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# Author: Gregor Leban (gregor.leban@fri.uni-lj.si)
# Description:
#    main file, that creates the MDI environment

# This module has to be imported first because it takes care of the system PATH variable
# Namely, it throws out the MikTeX directories which contain an incompatible Qt .dll's
import Orange
import orngEnviron, Orange.utils.addons

from PyQt4.QtCore import *
from PyQt4.QtGui import *
    
import sys, os, cPickle, orngRegistry, OWGUI
import pkg_resources
import orngTabs, orngDoc, orngDlgs, orngOutput, orngHelp, OWReport
import user, orngMisc

import gc

RedR = False
product = "Red R" if RedR else "Orange"

class OrangeCanvasDlg(QMainWindow):
    def __init__(self, app, parent=None, flags=0):
        QMainWindow.__init__(self, parent)
        self.debugMode = 1        # print extra output for debuging
        self.setWindowTitle("%s Canvas" % product)
        self.windows = []    # list of id for windows in Window menu
        self.recentDocs = []
        self.iconNameToIcon = {}
        self.toolbarIconSizeList = [16, 32, 40, 48, 60]
        self.schemeIconSizeList = [32, 40, 48]
        self.widgetsToolBar = None
        self.originalPalette = QApplication.palette()

        self.__dict__.update(orngEnviron.directoryNames)
            
        self.defaultPic = os.path.join(self.picsDir, "Unknown.png")
        self.defaultBackground = os.path.join(self.picsDir, "frame.png")
        canvasPicsDir = os.path.join(self.canvasDir, "icons")
        self.file_new = os.path.join(canvasPicsDir, "doc.png")
        self.outputPix = os.path.join(canvasPicsDir, "output.png")
        self.file_open = os.path.join(canvasPicsDir, "open.png")
        self.file_save = os.path.join(canvasPicsDir, "save.png")
        if RedR:
            self.reload_pic = os.path.join(canvasPicsDir, "update1.png")
        self.text_icon = os.path.join(canvasPicsDir, "text.png")
        self.file_print = os.path.join(canvasPicsDir, "print.png")
        self.file_exit = os.path.join(canvasPicsDir, "exit.png")
        canvasIconName = os.path.join(canvasPicsDir, "CanvasIcon.png")
        if os.path.exists(canvasIconName):
            self.setWindowIcon(QIcon(canvasIconName))
            
        self.settings = {}
        if RedR:
            self.settings['svnSettings'] = {}
            self.settings['versionNumber'] = 'Version1.0'
        self.menuSaveSettingsID = -1
        self.menuSaveSettings = 1

        self.loadSettings()
        if RedR:
            import updateRedR
            self.settings['svnSettings'], self.settings['versionNumber'] = updateRedR.start(self.settings['svnSettings'], self.settings['versionNumber'])
           
#        self.widgetSelectedColor = QColor(*self.settings["widgetSelectedColor"])
#        self.widgetActiveColor = QColor(*self.settings["widgetActiveColor"])
#        self.lineColor = QColor(*self.settings["lineColor"])

        # output window
        self.output = orngOutput.OutputWindow(self)
#        self.output.catchException(1)
        self.output.catchOutput(1)
        
        self.updateWidgetRegistry()

        # create error and warning icons
        informationIconName = os.path.join(canvasPicsDir, "information.png")
        warningIconName = os.path.join(canvasPicsDir, "warning.png")
        errorIconName = os.path.join(canvasPicsDir, "error.png")
        if os.path.exists(errorIconName) and os.path.exists(warningIconName) and os.path.exists(informationIconName):
            self.errorIcon = QPixmap(errorIconName)
            self.warningIcon = QPixmap(warningIconName)
            self.informationIcon = QPixmap(informationIconName)
            self.widgetIcons = {"Info": self.informationIcon, "Warning": self.warningIcon, "Error": self.errorIcon}
        else:
            self.errorIcon = None
            self.warningIcon = None
            self.informationIcon = None
            self.widgetIcons = None
            print "Unable to load all necessary icons. Please reinstall Orange."
        
        #########
        # Actions
        #########
        self.showMainToolbarAction = QAction("Main Toolbar", self)
        self.showMainToolbarAction.setCheckable(True)
        self.showMainToolbarAction.setChecked(self.settings.get("showToolbar", True))
        self.connect(self.showMainToolbarAction,
                     SIGNAL("triggered(bool)"),
                     self.menuItemShowToolbar)
        
        self.showWidgetToolbarAction = QAction("Widget Toolbar", self)
        self.showWidgetToolbarAction.setCheckable(True)
        self.showWidgetToolbarAction.setChecked(self.settings.get("showWidgetToolbar", True))
        self.connect(self.showWidgetToolbarAction,
                     SIGNAL("triggered(bool)"),
                     self.menuItemShowWidgetToolbar)
        
        # TODO: Move other actions currently defined elsewhere
        
        self.setStatusBar(MyStatusBar(self))
        self.statusBar().setVisible(self.settings.get("showStatusBar", True))
        self.sizeGrip = SizeGrip(self)
        self.sizeGrip.setVisible(not self.settings.get("showStatusBar", True))
        
        self.updateStyle()
        
        self.eventNotifier = EventNotifier(parent=self)
        # create toolbar
        self.toolbar = self.addToolBar("Toolbar")
        self.toolbar.setOrientation(Qt.Horizontal)
#        self.toolbar.setToolButtonStyle(Qt.ToolButtonTextUnderIcon)
        if not self.settings.get("showToolbar", True):
            self.toolbar.hide()
        
        # create a schema
        self.schema = orngDoc.SchemaDoc(self)
        # A corner widget to reserve space for the size grip when
        # the status bar is hidden
        self.schema.canvasView.setCornerWidget(QWidget())
        
        self.setCentralWidget(self.schema)
        self.schema.setFocus()

        self.toolbar.addAction(QIcon(self.file_open), "Open schema", self.menuItemOpen)
#        self.toolbar.addAction(QIcon(self.style().standardIcon(QStyle.SP_FileIcon)), "Open schema", self.menuItemOpen)
        self.toolSave = self.toolbar.addAction(QIcon(self.file_save), "Save schema", self.menuItemSave)
#        self.toolSave = self.toolbar.addAction(QIcon(self.style().standardIcon(QStyle.SP_DialogSaveButton)), "Save schema", self.menuItemSave)
        if RedR:
            self.toolReloadWidgets = self.toolbar.addAction(QIcon(self.reload_pic), "Reload Widgets", self.reloadWidgets)
        self.toolbar.addSeparator()
        self.toolbar.addAction(QIcon(self.file_print), "Print", self.menuItemPrinter)
        self.toolbar.addSeparator()
        
        # Create the controls for widget list type in the main toolbar
        # Commented out because this duplicates the entries in the View menu.
#        def updateWidgetListType():
#            self.createWidgetsToolbar()
#            ind = min(len(self.widgetListTypeActions) - 1, self.settings["widgetListType"])
#            self.widgetListTypeActions[ind].setChecked(True)
#            
#        def updateToolbarIconSize():
#            self.createWidgetsToolbar()
#            ind = min(len(self.iconSizeActions) - 1, self.settings["toolbarIconSize"])
#            self.iconSizeActions[ind].setChecked(True)
#            
#        w = QWidget()
#        w.setLayout(QHBoxLayout())
#        
#        items = ["Tool box", "Tree view", "Tree view (no icons)", "Tabs without labels", "Tabs with labels"]
#        ind = max(len(items) - 1, self.settings["widgetListType"])
#        self.widgetListTypeCB = OWGUI.comboBox(w, self.settings, "widgetListType",
#                                    label="Style:", orientation="horizontal",
#                                    items=items,
#                                    callback=updateWidgetListType,
#                                    debuggingEnabled=0)
#        
#        self.widgetListTypeCB.setFocusPolicy(Qt.TabFocus)
#        self.toolbar.addWidget(w)
#        
#        self.toolbar.addSeparator()
#
#        w = QWidget()
#        w.setLayout(QHBoxLayout())
#        items = ["%d x %d" % (v, v) for v in self.toolbarIconSizeList]
#        self.settings["toolbarIconSize"] = min(len(items) - 1, self.settings["toolbarIconSize"])
#        cb = OWGUI.comboBoxWithCaption(w, self.settings, "toolbarIconSize", "Icon size:",
#                                       items=items,
#                                       tooltip="Set the size of the widget icons in the toolbar, tool box, and tree view area",
#                                       callback=updateToolbarIconSize,
#                                       debuggingEnabled=0)
#        cb.setFocusPolicy(Qt.TabFocus)
#        
#        self.toolbar.addWidget(w)
        
        self.freezeAction = self.toolbar.addAction("Freeze signals")
        self.freezeAction.setCheckable(True)
        self.freezeAction.setIcon(QIcon(self.style().standardIcon(QStyle.SP_MediaPause))) #self.schema_pause))
        
        def toogleSchemaFreeze(freeze):
            self.freezeAction.setIcon(QIcon(self.style().standardIcon(QStyle.SP_MediaPlay if freeze else QStyle.SP_MediaPause))) #self.schema_pause))
            self.schema.setFreeze(freeze)
            
        self.connect(self.freezeAction, SIGNAL("toggled(bool)"), toogleSchemaFreeze)
        
        # Restore geometry before calling createWidgetsToolbar.
        # On Mac OSX with unified title bar the canvas can move up on restarts
        state = self.settings.get("CanvasMainWindowGeometry", None)
        if state is not None:
            state = self.restoreGeometry(QByteArray(state))
            width, height = self.width(), self.height()
        
        if not state:
            width, height = self.settings.get("canvasWidth", 700), self.settings.get("canvasHeight", 600)

        # center window in the desktop
        # on multiheaded desktops if it does not fit
        
        desktop = qApp.desktop()
        space = desktop.availableGeometry(self)
        geometry, frame = self.geometry(), self.frameGeometry()
        
        #Fit the frame size to fit in space
        width = min(space.width() - (frame.width() - geometry.width()), geometry.width())
        height = min(space.height() - (frame.height() - geometry.height()), geometry.height())
        
        self.resize(width, height)
        
        self.addToolBarBreak()
        orngTabs.constructCategoriesPopup(self)
        self.createWidgetsToolbar()
        self.readShortcuts()
        
        def addOnRefreshCallback():
            self.updateWidgetRegistry()
            orngTabs.constructCategoriesPopup(self)
            self.createWidgetsToolbar()
        Orange.utils.addons.addon_refresh_callback.append(addOnRefreshCallback)

        # create menu
        self.initMenu()
        self.readRecentFiles()
        
        #move to center if frame not fully contained in space
        if not space.contains(self.frameGeometry()):
            x = max(0, space.width() / 2 - width / 2)
            y = max(0, space.height() / 2 - height / 2)
            
            self.move(x, y)

        self.helpWindow = orngHelp.HelpWindow(self)
        self.reportWindow = OWReport.ReportWindow()
        self.reportWindow.widgets = self.schema.widgets
        self.reportWindow.saveDir = self.settings["reportsDir"]
        

        # did Orange crash the last time we used it? If yes, you will find a tempSchema.tmp file
        if not RedR:
            if os.path.exists(os.path.join(self.canvasSettingsDir, "tempSchema.tmp")):
                mb = QMessageBox('%s Canvas' % product, "Your previous %s Canvas session was not closed successfully.\nYou can choose to reload your unsaved work or start a new session.\n\nIf you choose 'Reload', the links will be disabled to prevent reoccurence of the crash.\nYou can enable them by clicking Options/Enable all links." % product, QMessageBox.Information, QMessageBox.Ok | QMessageBox.Default, QMessageBox.Cancel | QMessageBox.Escape, QMessageBox.NoButton)
                mb.setButtonText(QMessageBox.Ok, "Reload")
                mb.setButtonText(QMessageBox.Cancel, "New schema")
                if mb.exec_() == QMessageBox.Ok:
                    self.schema.loadDocument(os.path.join(self.canvasSettingsDir, "tempSchema.tmp"), freeze=1)
        
        if self.schema.widgets == [] and len(sys.argv) > 1 and os.path.exists(sys.argv[-1]) and os.path.splitext(sys.argv[-1])[1].lower() == ".ows":
            self.schema.loadDocument(sys.argv[-1])
        
        # Raise the size grip so it is above all other widgets
        self.sizeGrip.raise_()
        
        # show message box if no numpy
        qApp.processEvents()
        try:
            import numpy
        except ImportError:
            if QMessageBox.warning(self, '%s Canvas' % product, 'Several widgets now use numpy module, \nthat is not yet installed on this computer. \nDo you wish to download it?', QMessageBox.Ok | QMessageBox.Default, QMessageBox.Cancel | QMessageBox.Escape) == QMessageBox.Ok:
                import webbrowser
                webbrowser.open("http://sourceforge.net/projects/numpy/")
                
        # On Mac if the user clicks the Toolbar button in the title bar
        if sys.platform == "darwin":
            self.eventNotifier.attach(self, QEvent.ToolBarChange, self.toogleToolbarState)
            
        self.output.catchException(1)

    def updateWidgetRegistry(self):
        """ Update the widget registry and add new category tabs to the
        settings dict.  
        """
        # The default Widget tabs order
        if not self.settings.has_key("WidgetTabs") or self.settings["WidgetTabs"] == []:
            f = open(os.path.join(self.canvasDir, "WidgetTabs.txt"), "r")
            defaultTabs = [c for c in [line.split("#")[0].strip() for line in f.readlines()] if c!=""]
            for i in xrange(len(defaultTabs)-1,0,-1):
                if defaultTabs[i] in defaultTabs[0:i]:
                    del defaultTabs[i]
            self.settings["WidgetTabs"] = [(name, Qt.Checked) for name in defaultTabs] + [("Visualize Qt", Qt.Unchecked), ("Prototypes", Qt.Unchecked)]
            
        widgetTabList = self.settings["WidgetTabs"]
        self.widgetRegistry = orngRegistry.readCategories()
        
        extraTabs = [(name, 1) for name in self.widgetRegistry.keys() if name not in [tab for (tab, s) in widgetTabList]]
        extraTabs = sorted(extraTabs)
        
        # Keep Prototypes as last in list
        if widgetTabList[-1][0] == "Prototypes" and widgetTabList[-2][0] == "Visualize Qt":
            widgetTabList = widgetTabList[: -2] + extraTabs + widgetTabList[-2 :]
        elif widgetTabList[-1][0] == "Prototypes":
            widgetTabList = widgetTabList[: -1] + extraTabs + widgetTabList[-1 :]
        else:
            widgetTabList = widgetTabList + extraTabs
        self.settings["WidgetTabs"] = widgetTabList
            
    def createWidgetsToolbar(self):
        barstate, treestate = None, None
        if self.widgetsToolBar:
            self.settings["showWidgetToolbar"] = self.widgetsToolBar.isVisible()
            if isinstance(self.widgetsToolBar, QToolBar):
                self.removeToolBar(self.widgetsToolBar)
                barstate = (self.tabs.currentIndex(), )
            elif isinstance(self.widgetsToolBar, orngTabs.WidgetToolBox):
                self.settings["toolboxWidth"] = self.widgetsToolBar.toolbox.width()
                self.removeDockWidget(self.widgetsToolBar)
                barstate = (self.tabs.toolbox.currentIndex(), )
            elif isinstance(self.widgetsToolBar, orngTabs.WidgetTree):
                self.settings["toolboxWidth"] = self.widgetsToolBar.treeWidget.width()
                self.removeDockWidget(self.widgetsToolBar)
                treestate = ( [self.tabs.treeWidget.topLevelItem(i).isExpanded()
                               for i in range(self.tabs.treeWidget.topLevelItemCount())], )
            
        if self.settings["widgetListType"] == 0:
            self.tabs = self.widgetsToolBar = orngTabs.WidgetToolBox(self, self.widgetRegistry)
            self.addDockWidget(Qt.LeftDockWidgetArea, self.widgetsToolBar)
        elif self.settings["widgetListType"] in [1, 2]:
            self.tabs = self.widgetsToolBar = orngTabs.WidgetTree(self, self.widgetRegistry)
            self.addDockWidget(Qt.LeftDockWidgetArea, self.widgetsToolBar)
        else:
            if sys.platform == "darwin":
                self.setUnifiedTitleAndToolBarOnMac(False)
            self.widgetsToolBar = self.addToolBar("Widgets")
            self.insertToolBarBreak(self.widgetsToolBar)
            self.tabs = orngTabs.WidgetTabs(self, self.widgetRegistry, self.widgetsToolBar)
            self.widgetsToolBar.addWidget(self.tabs)
            
        if sys.platform == "darwin":
            self.setUnifiedTitleAndToolBarOnMac(self.settings["widgetListType"] in [0, 1, 2] and self.settings["style"].lower() == "macintosh (aqua)")

        # find widgets and create tab with buttons
        self.tabs.createWidgetTabs(self.settings["WidgetTabs"], self.widgetRegistry, self.widgetDir, self.picsDir, self.defaultPic)
        if not self.settings.get("showWidgetToolbar", True): 
            self.widgetsToolBar.hide()
        if barstate:
            if self.settings["widgetListType"] == 0:
                self.tabs.toolbox.setCurrentIndex(barstate[0])
            elif self.settings["widgetListType"] in [1, 2]:
                widget = self.tabs.treeWidget
                widget.scrollToItem(widget.topLevelItem(barstate[0]),
                                    QAbstractItemView.PositionAtTop)
            else:
                self.tabs.setCurrentIndex(barstate[0])
        if treestate and self.settings["widgetListType"] in [1, 2]:
            for i, e in enumerate(treestate[0]):
                self.tabs.treeWidget.topLevelItem(i).setExpanded(e)


    def readShortcuts(self):
        self.widgetShortcuts = {}
        shfn = os.path.join(self.canvasSettingsDir, "shortcuts.txt")
        if os.path.exists(shfn):
            for t in file(shfn).readlines():
                key, info = [x.strip() for x in t.split(":")]
                if len(info) == 0: continue
                if info[0] == "(" and info[-1] == ")":
                    cat, widgetName = eval(info)            # new style of shortcuts are of form F: ("Data", "File")
                else:
                    cat, widgetName = info.split(" - ")   # old style of shortcuts are of form F: Data - File
                if self.widgetRegistry.has_key(cat) and self.widgetRegistry[cat].has_key(widgetName):
                    self.widgetShortcuts[key] = self.widgetRegistry[cat][widgetName]

    def initMenu(self):
        self.menuRecent = QMenu("Recent Schemas", self)

        self.menuFile = QMenu("&File", self)
        self.menuFile.addAction("New Scheme", self.menuItemNewScheme, QKeySequence.New)
        self.menuFile.addAction(QIcon(self.file_open), "&Open...", self.menuItemOpen, QKeySequence.Open)
        self.menuFile.addAction(QIcon(self.file_open), "&Open and Freeze...", self.menuItemOpenFreeze)
        if RedR:
            self.menuFile.addAction("Import Schema", self.importSchema)
        if os.path.exists(os.path.join(self.canvasSettingsDir, "lastSchema.tmp")):
            self.menuFile.addAction("Reload Last Schema", self.menuItemOpenLastSchema, Qt.CTRL + Qt.Key_R)
        #self.menuFile.addAction( "&Clear", self.menuItemClear)
        self.menuFile.addSeparator()
        self.menuReportID = self.menuFile.addAction("&Report", self.menuItemReport, Qt.CTRL + Qt.ALT + Qt.Key_R)
        self.menuFile.addSeparator()
        self.menuSaveID = self.menuFile.addAction(QIcon(self.file_save), "&Save", self.menuItemSave, QKeySequence.Save)
        self.menuSaveAsID = self.menuFile.addAction("Save &as...", self.menuItemSaveAs)
        if not RedR:
            self.menuFile.addAction("&Save as Application (Tabs)...", self.menuItemSaveAsAppTabs)
            self.menuFile.addAction("&Save as Application (Buttons)...", self.menuItemSaveAsAppButtons)
        self.menuFile.addSeparator()
        self.menuFile.addAction(QIcon(self.file_print), "&Print Schema / Save image", self.menuItemPrinter, QKeySequence.Print)
        self.menuFile.addSeparator()
        self.menuFile.addMenu(self.menuRecent)
        self.menuFile.addSeparator()
        self.menuFile.addAction("E&xit", self.close, Qt.CTRL + Qt.Key_Q)
        
        self.menuView = QMenu("&View", self)
        # Show Toolbars menu
        toolbars = self.createPopupMenu()
        self.menuView.addMenu(toolbars)
        self.menuView.addSeparator()
        
        
        # Widget list type menu
        actions = ["Toolbox", "Tree View", "Tree View (no icons)",
                   "Tabs Without Labels", "Tabs With Labels"]
        style = QMenu("Widget Toolbar Style", self)
        styleGroup = QActionGroup(style)
        styleGroup.setExclusive(True)
        
        def setListType(id):
            self.settings["widgetListType"] = id
            self.createWidgetsToolbar()
            
        for id, action in enumerate(actions):
            action = style.addAction(action, lambda id=id: setListType(id))
            action.setCheckable(True)
            styleGroup.addAction(action)
            style.addAction(action)
            
        styleActions = list(styleGroup.actions()) 
        ind = min(len(styleActions) -1 , self.settings.get("widgetListType", -1))
        styleActions[ind].setChecked(True)
        self.widgetListTypeActions = styleActions
        
        self.menuView.addMenu(style)
        
        # Widget toobox icon size menu
        iconSize = QMenu("Widget Icon Size", self)
        sizes = ["%i x %i" % (s, s) for s in self.toolbarIconSizeList]
        sizeGroup = QActionGroup(iconSize)
        
        def setIconSize(id):
            self.settings["toolbarIconSize"] = id
            self.createWidgetsToolbar()
            
        for id, size in enumerate(sizes):
            action = iconSize.addAction(size, lambda id=id: setIconSize(id))
            action.setCheckable(True)
            sizeGroup.addAction(action)
            iconSize.addAction(action)
            
        sizeActions = list(sizeGroup.actions())
        ind = min(len(sizeActions) - 1, self.settings.get("toolbarIconSize", -1))
        sizeActions[ind].setChecked(True)
        self.iconSizeActions = sizeActions
        
        self.menuView.addMenu(iconSize)
        
        self.menuView.addSeparator()
        self.showStatusBarAction = self.menuView.addAction("Show Status Bar",
                                                self.menuItemShowStatusBar)
        self.showStatusBarAction.setCheckable(True)
        self.showStatusBarAction.setChecked(self.settings.get("showStatusBar", True))

        self.menuOptions = QMenu("&Options", self)
        self.menuOptions.addAction("Enable All Links", self.menuItemEnableAll, Qt.CTRL + Qt.Key_E)
        self.menuOptions.addAction("Disable All Links", self.menuItemDisableAll, Qt.CTRL + Qt.Key_D)
        self.menuOptions.addSeparator()
        self.menuOptions.addAction("Show Output Window", self.menuItemShowOutputWindow)
        self.menuOptions.addAction("Clear Output Window", self.menuItemClearOutputWindow)
        self.menuOptions.addAction("Save Output Text...", self.menuItemSaveOutputWindow)
        if RedR:
            self.menuOptions.addAction("Set to debug mode", self.setDebugMode)
        
        # uncomment this only for debugging
#        self.menuOptions.addSeparator()
#        self.menuOptions.addAction("Dump widget variables", self.dumpVariables)

        self.menuOptions.addSeparator()
#        self.menuOptions.addAction( "Channel preferences",  self.menuItemPreferences)
        #self.menuOptions.addSeparator()
        self.menuOptions.addAction("&Customize Shortcuts", self.menuItemEditWidgetShortcuts)
        self.menuOptions.addAction("&Delete Widget Settings", self.menuItemDeleteWidgetSettings)
        self.menuOptions.addSeparator()
        self.menuOptions.addAction(sys.platform == "darwin" and "&Preferences..." or "Canvas &Options...", self.menuItemCanvasOptions)
        self.menuOptions.addAction("&Add-ons...", self.menuItemAddOns)

        localHelp = 0
        self.menuHelp = QMenu("&Help", self) 
        self.menuHelp.addAction("Orange Online Reference", self.menuOpenOnlineOrangeReference)
#        if os.path.exists(os.path.join(self.orangeDir, r"doc/catalog/index.html")):
#            self.menuHelp.addAction("Orange Widget Catalog", self.menuOpenLocalWidgetCatalog)
#        if os.path.exists(os.path.join(self.orangeDir, r"doc/canvas/default.htm")):
#            self.menuHelp.addAction("Orange Canvas Help", self.menuOpenLocalCanvasHelp)
        self.menuHelp.addAction("Orange Online Widget Catalog", self.menuOpenOnlineOrangeHelp)
        #self.menuHelp.addAction("Orange Canvas Online Help", self.menuOpenOnlineCanvasHelp)            
        self.menuHelp.addSeparator()
        self.menuHelp.addAction("About Orange", self.menuItemAboutOrange)

        # widget popup menu
        self.widgetPopup = QMenu("Widget", self)
        self.openActiveWidgetAction = self.widgetPopup.addAction("Open", self.schema.canvasView.openActiveWidget)
        self.widgetPopup.addSeparator()
        self.renameActiveWidgetAction = rename = self.widgetPopup.addAction("&Rename", self.schema.canvasView.renameActiveWidget, Qt.Key_F2)
        self.removeActiveWidgetAction = delete = self.widgetPopup.addAction("Remove", self.schema.canvasView.removeActiveWidget, Qt.Key_Delete)
        if sys.platform != "darwin":
            delete.setShortcuts([Qt.Key_Delete, Qt.CTRL + Qt.Key_Backspace, Qt.CTRL + Qt.Key_Delete])
        else:
            delete.setShortcuts([Qt.CTRL + Qt.Key_Backspace, Qt.Key_Delete, Qt.CTRL + Qt.Key_Delete])
        self.widgetPopup.addSeparator()
        self.helpActiveWidgetAction = self.widgetPopup.addAction("Help", self.schema.canvasView.helpOnActiveWidget, Qt.Key_F1)
        self.widgetPopup.setEnabled(0)
        
        if sys.platform == "darwin":
            self.windowPopup = QMenu("Window", self)
            self.windowPopup.addAction("Minimize", self.showMinimized, Qt.CTRL + Qt.Key_M)
            self.windowPopup.addAction("Zoom", self.showMaximized, 0)

        self.menuBar = QMenuBar(self)
        self.menuBar.addMenu(self.menuFile)
        self.menuBar.addMenu(self.menuView)
        self.menuBar.addMenu(self.menuOptions)
        self.menuBar.addMenu(self.widgetPopup)
        
        if hasattr(self, "windowPopup"):
            self.menuBar.addMenu(self.windowPopup)
            
        self.menuBar.addMenu(self.menuHelp)
        
        self.setMenuBar(self.menuBar)
        
    def setDebugMode(self):   # RedR specific
        if self.output.debugMode:
            self.output.debugMode = 0
        else:
            self.output.debugMode = 1
    def importSchema(self):   # RedR specific
        name = QFileDialog.getOpenFileName(self, "Import File", self.settings["saveSchemaDir"], "Orange Widget Scripts (*.ows)")
        if name.isEmpty():
            return
        name = unicode(name)
        self.schema.clear()
        self.schema.loadDocument(name, freeze = 0, importBlank = 1)
        self.addToRecentMenu(name)
    
    def openSchema(self, filename):
        if self.schema.isSchemaChanged() and self.schema.widgets:
            ret = QMessageBox.warning(self, "Orange Canvas", "Changes to your present schema are not saved.\nSave them?",
                                      QMessageBox.Save | QMessageBox.Discard | QMessageBox.Cancel, QMessageBox.Save)
            if ret == QMessageBox.Save:
                self.schema.saveDocument()
            elif ret == QMessageBox.Cancel:
                return
        self.schema.clear()
        dirname = os.path.dirname(filename)
        os.chdir(dirname)
        self.schema.loadDocument(filename)
        
    def menuItemOpen(self):
        name = QFileDialog.getOpenFileName(self, "Open Orange Schema", self.settings["saveSchemaDir"], "Orange Widget Scripts (*.ows)")
        if name.isEmpty():
            return
        name = unicode(name)
        self.schema.clear()
        dirname = os.path.dirname(name)
        os.chdir(dirname)
        self.schema.loadDocument(name, freeze=0)
        self.addToRecentMenu(name)

    def menuItemOpenFreeze(self):
        name = QFileDialog.getOpenFileName(self, "Open Orange Schema", self.settings["saveSchemaDir"], "Orange Widget Scripts (*.ows)")
        if name.isEmpty():
            return
        name = unicode(name)
        self.schema.clear()
        dirname = os.path.dirname(name)
        os.chdir(dirname)
        self.schema.loadDocument(name, freeze=1)
        self.addToRecentMenu(name)

    def menuItemOpenLastSchema(self):
        fullName = os.path.join(self.canvasSettingsDir, "lastSchema.tmp")
        if os.path.exists(fullName):
            self.schema.loadDocument(fullName)

    def menuItemReport(self):
        self.schema.reportAll()
        
    def menuItemSave(self):
        self.schema.saveDocument()
        
    def menuItemSaveAs(self):
        self.schema.saveDocumentAs()

    def menuItemSaveAsAppButtons(self):
        self.schema.saveDocumentAsApp(asTabs=0)

    def menuItemSaveAsAppTabs(self):
        self.schema.saveDocumentAsApp(asTabs=1)

    def menuItemPrinter(self):
        try:
            import OWDlgs
            sizeDlg = OWDlgs.OWChooseImageSizeDlg(self.schema.canvas, defaultName=self.schema.schemaName or "schema", parent=self)
            sizeDlg.exec_()
        except:
            print "Missing file 'OWDlgs.py'. This file should be in OrangeWidgets folder. Unable to print/save image."
        

    def readRecentFiles(self):
        self.menuRecent.clear()
        recentDocs = self.settings.get("RecentFiles", [])

        # remove missing recent files
        for i in range(len(recentDocs) - 1, -1, -1):
            if not os.path.exists(recentDocs[i]):
                recentDocs.remove(recentDocs[i])

        recentDocs = recentDocs[:9]
        self.settings["RecentFiles"] = recentDocs
        
        if len(recentDocs) == 0 :
            self.menuRecent.addAction("None").setEnabled(False)
        else :            
            for i in range(len(recentDocs)):
                shortName = "&" + str(i + 1) + " " + os.path.basename(recentDocs[i])
                self.menuRecent.addAction(shortName, lambda ind=i: self.openRecentFile(ind),)

    def openRecentFile(self, index):
        if index < len(self.settings["RecentFiles"]):
            name = self.settings["RecentFiles"][index]
            if self.schema.saveBeforeClose():
                self.schema.clear()
                dirname = os.path.dirname(name)
                os.chdir(dirname)
                self.schema.loadDocument(name)
                self.addToRecentMenu(name)

    def addToRecentMenu(self, name):
        recentDocs = []
        if self.settings.has_key("RecentFiles"):
            recentDocs = self.settings["RecentFiles"]

        # convert to a valid file name
        name = os.path.realpath(name)

        if name in recentDocs:
            recentDocs.remove(name)
        recentDocs.insert(0, name)

        if len(recentDocs) > 5:
            recentDocs.remove(recentDocs[5])
        self.settings["RecentFiles"] = recentDocs
        self.readRecentFiles()

    def menuItemSelectAll(self):
        return

    def updateSnapToGrid(self):
        if self.settings["snapToGrid"]:
            for widget in self.schema.widgets:
                widget.setCoords(widget.x(), widget.y())
            self.schema.canvas.update()

    def menuItemEnableAll(self):
        self.schema.enableAllLines()

    def menuItemDisableAll(self):
        self.schema.disableAllLines()

    def menuItemSaveSettings(self):
        self.menuSaveSettings = not self.menuSaveSettings
        self.menuOptions.setItemChecked(self.menuSaveSettingsID, self.menuSaveSettings)

    def menuItemNewScheme(self):
        if self.schema.saveBeforeClose():
            self.schema.clear()
            self.schema.removeTempDoc()

    def dumpVariables(self):
        self.schema.dumpWidgetVariables()

    def menuItemShowOutputWindow(self):
        self.output.show()
        self.output.raise_()
#        self.output.activateWindow()

    def menuItemClearOutputWindow(self):
        self.output.textOutput.clear()
        self.statusBar().showMessage("")

    def menuItemSaveOutputWindow(self):
        qname = QFileDialog.getSaveFileName(self, "Save Output To File", self.canvasSettingsDir + "/Output.html", "HTML Document (*.html)")
        if qname.isEmpty(): return
        
        text = str(self.output.textOutput.toHtml())
        #text = text.replace("</nobr>", "</nobr><br>")

        file = open(unicode(name), "wt")
        file.write(text)
        file.close()

    def menuItemShowToolbar(self, show=True):
        self.toolbar.setVisible(show)
        self.settings["showToolbar"] = show
        self.showMainToolbarAction.setChecked(show)

    def menuItemShowWidgetToolbar(self, show=True):
        self.widgetsToolBar.setVisible(show)
        self.settings["showWidgetToolbar"] = show
        self.showWidgetToolbarAction.setChecked(show)
        
    def createPopupMenu(self):
        """ Create a menu with show toolbar entries.
        """
        toolbars = QMenu("Show Toolbars", self)
        toolbars.addAction(self.showMainToolbarAction)
        toolbars.addAction(self.showWidgetToolbarAction)
        return toolbars
        
    def toogleToolbarState(self):
        """ Toogle the toolbar state (Mac OSX specific). This gets called when
        the toolbar button in the unified title bar was clicked.
        """
        state = not self.settings["showToolbar"]
        self.settings["showToolbar"] = state
        self.showMainToolbarAction.setChecked(state)
        

    def menuItemEditWidgetShortcuts(self):
        dlg = orngDlgs.WidgetShortcutDlg(self, self)
        if dlg.exec_() == QDialog.Accepted:
            self.widgetShortcuts = dict([(y, x) for x, y in dlg.invDict.items()])
            shf = file(os.path.join(self.canvasSettingsDir, "shortcuts.txt"), "wt")
            for k, widgetInfo in self.widgetShortcuts.items():
                shf.write("%s: %s\n" % (k, (widgetInfo.category, widgetInfo.name)))

    def menuItemDeleteWidgetSettings(self):
        if QMessageBox.warning(self, 'Orange Canvas', 'Delete all settings?\nNote that for a complete reset there should be no open schema with any widgets.', QMessageBox.Ok | QMessageBox.Default, QMessageBox.Cancel | QMessageBox.Escape) == QMessageBox.Ok:
            if os.path.exists(self.widgetSettingsDir):
                for f in os.listdir(self.widgetSettingsDir):
                    if os.path.splitext(f)[1].lower() == ".ini":
                        os.remove(os.path.join(self.widgetSettingsDir, f))

    def menuOpenLocalOrangeHelp(self):
        import webbrowser
        webbrowser.open("file:///" + os.path.join(self.orangeDir, "doc/reference/default.htm"))

    def menuOpenLocalWidgetCatalog(self):
        import webbrowser
        webbrowser.open("file:///" + os.path.join(self.orangeDir, "doc/catalog/index.html"))

    def menuOpenLocalCanvasHelp(self):
        import webbrowser
        webbrowser.open(os.path.join(self.orangeDir, "doc/canvas/default.htm"))

    def menuOpenOnlineOrangeReference(self):
        import webbrowser
        webbrowser.open("http://orange.biolab.si/doc/reference/")
        
    def menuOpenOnlineOrangeHelp(self):
        import webbrowser
        webbrowser.open("http://orange.biolab.si/doc/widgets/")

    def menuOpenOnlineCanvasHelp(self):
        import webbrowser
        #webbrowser.open("http://orange.biolab.si/orangeCanvas") # to be added on the web
        webbrowser.open("http://orange.biolab.si")

    def menuCheckForUpdates(self):
        import updateOrange
        self.updateDlg = updateOrange.updateOrangeDlg(None)#, Qt.WA_DeleteOnClose)

    def menuItemAboutOrange(self):
        dlg = orngDlgs.AboutDlg(self)
        dlg.exec_()


## to see the signals you have to call: self.output.catchException(0); self.output.catchOutput(0)
## and run orngCanvas.pyw from command line using "python.exe orngCanvas.pyw"
#    def event(self, e):
#        eventDict = dict([(0, "None"), (130, "AccessibilityDescription"), (119, "AccessibilityHelp"), (86, "AccessibilityPrepare"), (114, "ActionAdded"), (113, "ActionChanged"), (115, "ActionRemoved"), (99, "ActivationChange"), (121, "ApplicationActivated"), (122, "ApplicationDeactivated"), (36, "ApplicationFontChange"), (37, "ApplicationLayoutDirectionChange"), (38, "ApplicationPaletteChange"), (35, "ApplicationWindowIconChange"), (68, "ChildAdded"), (69, "ChildPolished"), (71, "ChildRemoved"), (40, "Clipboard"), (19, "Close"), (82, "ContextMenu"), (52, "DeferredDelete"), (60, "DragEnter"), (62, "DragLeave"), (61, "DragMove"), (63, "Drop"), (98, "EnabledChange"), (10, "Enter"), (150, "EnterEditFocus"), (124, "EnterWhatsThisMode"), (116, "FileOpen"), (8, "FocusIn"), (9, "FocusOut"), (97, "FontChange"), (159, "GraphicsSceneContextMenu"), (164, "GraphicsSceneDragEnter"), (166, "GraphicsSceneDragLeave"), (165, "GraphicsSceneDragMove"), (167, "GraphicsSceneDrop"), (163, "GraphicsSceneHelp"), (160, "GraphicsSceneHoverEnter"), (162, "GraphicsSceneHoverLeave"), (161, "GraphicsSceneHoverMove"), (158, "GraphicsSceneMouseDoubleClick"), (155, "GraphicsSceneMouseMove"), (156, "GraphicsSceneMousePress"), (157, "GraphicsSceneMouseRelease"), (168, "GraphicsSceneWheel"), (18, "Hide"), (27, "HideToParent"), (127, "HoverEnter"), (128, "HoverLeave"), (129, "HoverMove"), (96, "IconDrag"), (101, "IconTextChange"), (83, "InputMethod"), (6, "KeyPress"), (7, "KeyRelease"), (89, "LanguageChange"), (90, "LayoutDirectionChange"), (76, "LayoutRequest"), (11, "Leave"), (151, "LeaveEditFocus"), (125, "LeaveWhatsThisMode"), (88, "LocaleChange"), (153, "MenubarUpdated"), (43, "MetaCall"), (102, "ModifiedChange"), (4, "MouseButtonDblClick"), (2, "MouseButtonPress"), (3, "MouseButtonRelease"), (5, "MouseMove"), (109, "MouseTrackingChange"), (13, "Move"), (12, "Paint"), (39, "PaletteChange"), (131, "ParentAboutToChange"), (21, "ParentChange"), (75, "Polish"), (74, "PolishRequest"), (123, "QueryWhatsThis"), (14, "Resize"), (117, "Shortcut"), (51, "ShortcutOverride"), (17, "Show"), (26, "ShowToParent"), (50, "SockAct"), (112, "StatusTip"), (100, "StyleChange"), (87, "TabletMove"), (92, "TabletPress"), (93, "TabletRelease"), (171, "TabletEnterProximity"), (172, "TabletLeaveProximity"), (1, "Timer"), (120, "ToolBarChange"), (110, "ToolTip"), (78, "UpdateLater"), (77, "UpdateRequest"), (111, "WhatsThis"), (118, "WhatsThisClicked"), (31, "Wheel"), (132, "WinEventAct"), (24, "WindowActivate"), (103, "WindowBlocked"), (25, "WindowDeactivate"), (34, "WindowIconChange"), (105, "WindowStateChange"), (33, "WindowTitleChange"), (104, "WindowUnblocked"), (126, "ZOrderChange"), (169, "KeyboardLayoutChange"), (170, "DynamicPropertyChange")])
#        if eventDict.has_key(e.type()):
#            print str(self.windowTitle()), eventDict[e.type()]
#        return QMainWindow.event(self, e)


    def menuItemCanvasOptions(self):
        dlg = orngDlgs.CanvasOptionsDlg(self, self)

        if dlg.exec_() == QDialog.Accepted:
            if self.settings["snapToGrid"] != dlg.settings["snapToGrid"]:
                self.updateSnapToGrid()

            if self.settings["widgetListType"] != dlg.settings["widgetListType"]:
                self.settings["widgetListType"] = dlg.settings["widgetListType"]
                self.createWidgetsToolbar()
                self.widgetListTypeCB.setCurrentIndex(self.settings["widgetListType"])
            self.settings.update(dlg.settings)
            self.updateStyle()
            
#            self.widgetSelectedColor = dlg.selectedWidgetIcon.color
#            self.widgetActiveColor   = dlg.activeWidgetIcon.color
#            self.lineColor           = dlg.lineIcon.color
            
            # update settings in widgets in current documents
            for widget in self.schema.widgets:
                widget.instance._useContexts = self.settings["useContexts"]
                widget.instance._owInfo = self.settings["owInfo"]
                widget.instance._owWarning = self.settings["owWarning"]
                widget.instance._owError = self.settings["owError"]
                widget.instance._owShowStatus = self.settings["owShow"]
                widget.instance.updateStatusBarState()
                widget.resetWidgetSize()
                widget.updateWidgetState()
                
            # update tooltips for lines in all documents
            for line in self.schema.lines:
                line.showSignalNames = self.settings["showSignalNames"]
                line.updateTooltip()
            
            self.schema.canvasView.repaint()
        
#            import orngEnviron, orngRegistry
#            if dlg.toAdd != []:
#                for (name, dir) in dlg.toAdd: 
#                    orngEnviron.registerAddOn(name, dir)
            
#            if dlg.toRemove != []:
#                for (catName, cat) in dlg.toRemove:
#                    addonsToRemove = set()
#                    for widget in cat.values():
#                        addonDir = widget.directory
#                        while os.path.split(addonDir)[1] in ["prototypes", "widgets"]:
#                            addonDir = os.path.split(addonDir)[0]
#                        addonName = os.path.split(addonDir)[1]
#                        addonsToRemove.add( (addonName, addonDir) )
#                    for addonToRemove in addonsToRemove: 
#                        orngEnviron.registerAddOn(add=False, *addonToRemove)
#            
#            if dlg.toAdd != [] or dlg.toRemove != []:
#                self.widgetRegistry = orngRegistry.readCategories()

            # save tab order settings
            newTabList = [(str(dlg.tabOrderList.item(i).text()), int(dlg.tabOrderList.item(i).checkState())) for i in range(dlg.tabOrderList.count())]
            if newTabList != self.settings["WidgetTabs"]:
                self.settings["WidgetTabs"] = newTabList
                self.createWidgetsToolbar()
                orngTabs.constructCategoriesPopup(self)

    def menuItemAddOns(self):
        import time
        t = time.time()
        lastRefresh = self.settings["lastAddonsRefresh"]
        dlg = orngDlgs.AddOnManagerDialog(self, self)
        if t - lastRefresh > 7*24*3600 or Orange.utils.addons.addons_corrupted():
            dlg.show()
            if Orange.utils.addons.addons_corrupted() or \
               QMessageBox.question(self, "Refresh",
                                    "List of add-ons in repository has not been refreshed for more than a week. Do you want to download the list now?",
                                     QMessageBox.Yes | QMessageBox.Default,
                                     QMessageBox.No | QMessageBox.Escape) == QMessageBox.Yes:

                try:
                    dlg.reloadRepo()
                    self.settings["lastAddonsRefresh"] = time.time()
                except Exception, e:
                    import traceback
                    traceback.print_exc()
                    QMessageBox.warning(self,'Download Failed', "Download of add-on list has failed.")

        dlg.exec_()

    def menuItemShowStatusBar(self):
        state = self.showStatusBarAction.isChecked()
        self.statusBar().setVisible(state)
        self.sizeGrip.setVisible(not state)
        self.sizeGrip.raise_()
        self.settings["showStatusBar"] = state

    def updateStyle(self):
        QApplication.setStyle(QStyleFactory.create(self.settings["style"]))
#        qApp.setStyleSheet(" QDialogButtonBox { button-layout: 0; }")       # we want buttons to go in the "windows" direction (Yes, No, Cancel)
        if self.settings["useDefaultPalette"]:
            QApplication.setPalette(qApp.style().standardPalette())
        else:
            QApplication.setPalette(self.originalPalette)


    def setStatusBarEvent(self, text):
        if text == "" or text == None:
            self.statusBar().showMessage("")
            return
        elif text == "\n": return
        text = str(text)
        text = text.replace("<nobr>", ""); text = text.replace("</nobr>", "")
        text = text.replace("<b>", ""); text = text.replace("</b>", "")
        text = text.replace("<i>", ""); text = text.replace("</i>", "")
        text = text.replace("<br>", ""); text = text.replace("&nbsp", "")
        self.statusBar().showMessage("Last event: " + str(text), 5000)

    # Loads settings from the widget's .ini file
    def loadSettings(self):
        self.settings = {"widgetListType": 4, "iconSize": "40 x 40", "toolbarIconSize": 2, "toolboxWidth": 200, 'schemeIconSize': 1,
                       "snapToGrid": 1, "writeLogFile": 1, "dontAskBeforeClose": 0, "saveWidgetsPosition": 1,
#                       "widgetSelectedColor": (0, 255, 0), "widgetActiveColor": (0, 0, 255), "lineColor": (0, 255, 0),
                       "reportsDir": self.defaultReportsDir, "saveSchemaDir": self.canvasSettingsDir, "saveApplicationDir": self.canvasSettingsDir,
                       "showSignalNames": 1, "useContexts": 1, "enableCanvasDropShadows": 0,
                       "canvasWidth": 700, "canvasHeight": 600, "useDefaultPalette": 0,
                       "focusOnCatchException": 1, "focusOnCatchOutput": 0, "printOutputInStatusBar": 1, "printExceptionInStatusBar": 1,
                       "outputVerbosity": 0, "synchronizeHelp": 1,
                       "ocShow": 1, "owShow": 0, "ocInfo": 1, "owInfo": 1, "ocWarning": 1, "owWarning": 1, "ocError": 1, "owError": 1,
                       "lastAddonsRefresh": 0}
        if RedR:
            self.setting.update({"svnSettings": None, "versionNumber": "Version0"})
        try:
            filename = os.path.join(self.canvasSettingsDir, "orngCanvas.ini")
            self.settings.update(cPickle.load(open(filename, "rb")))
        except:
            pass

        if not self.settings.has_key("style"):
            items = [str(n) for n in QStyleFactory.keys()]
            lowerItems = [str(n).lower() for n in QStyleFactory.keys()]
            if sys.platform == "darwin" and qVersion() < "4.6": #On Mac OSX full aqua style isn't supported until Qt 4.6
                currStyle = "cleanlooks"
            else:
                currStyle = str(qApp.style().objectName()).lower()
            self.settings.setdefault("style", items[lowerItems.index(currStyle)])


    # Saves settings to this widget's .ini file
    def saveSettings(self):
        filename = os.path.join(self.canvasSettingsDir, "orngCanvas.ini")
        file = open(filename, "wb")
        if self.settings["widgetListType"] == 1:        # tree view
            self.settings["treeItemsOpenness"] = dict([(key, self.tabs.tabDict[key].isExpanded()) for key in self.tabs.tabDict.keys()])
        cPickle.dump(self.settings, file)
        file.close()

    def closeEvent(self, ce):
        # save the current width of the toolbox, if we are using it
        if isinstance(self.widgetsToolBar, orngTabs.WidgetToolBox):
            self.settings["toolboxWidth"] = self.widgetsToolBar.toolbox.width()
        self.settings["showWidgetToolbar"] = self.widgetsToolBar.isVisible()
        self.settings["showToolbar"] = self.toolbar.isVisible()
        self.settings["reportsDir"] = self.reportWindow.saveDir

        closed = self.schema.close()
        if closed:
            self.canvasIsClosing = 1        # output window (and possibly report window also) will check this variable before it will close the window
            
            self.helpWindow.close()
            self.reportWindow.close()
            
            self.output.catchOutput(False)
            self.output.catchException(False)
            self.output.hide()
            self.output.logFile.close()
            
            ce.accept()
            
        else:
            ce.ignore()
        
        self.reportWindow.removeTemp()
        
        size = self.geometry().size()
        self.settings["canvasWidth"] = size.width()
        self.settings["canvasHeight"] = size.height()
        self.settings["CanvasMainWindowGeometry"] = str(self.saveGeometry())
        
        self.saveSettings()
        
    def wheelEvent(self, event):
        """ Silently accept the wheel event. This is to ensure combo boxes
        and other controls that have focus don't receive this event unless
        the cursor is over them.
        
        """
        event.accept()
        

    def setCaption(self, caption=""):
        if caption:
            caption = caption.split(".")[0]
            self.setWindowTitle(caption + " - %s Canvas" % product)
        else:
            self.setWindowTitle("%s Canvas" % product)
    
    def getWidgetIcon(self, widgetInfo):
        if self.iconNameToIcon.has_key(widgetInfo.icon):
            return self.iconNameToIcon[widgetInfo.icon]
        
        iconNames = self.getFullWidgetIconName(widgetInfo)
        iconBackgrounds = self.getFullIconBackgroundName(widgetInfo)
        icon = QIcon()
        if len(iconNames) == 1:
            iconSize = QPixmap(iconNames[0]).width()
            iconBackgrounds = [name for name in iconBackgrounds if QPixmap(name).width() == iconSize]
        for name, back in zip(iconNames, iconBackgrounds):
            image = QPixmap(back).toImage()
            painter = QPainter(image)
            painter.drawPixmap(0, 0, QPixmap(name))
            painter.end()
            icon.addPixmap(QPixmap.fromImage(image))
        if iconNames != [self.defaultPic]:
            self.iconNameToIcon[widgetInfo.icon] = icon
        return icon
            
    
    def getFullWidgetIconName(self, widgetInfo):
        iconName = widgetInfo.icon
        names = []
        name, ext = os.path.splitext(iconName)
        for num in [16, 32, 40, 48, 60]:
            names.append("%s_%d%s" % (name, num, ext))
        
        if widgetInfo.module:
            widgetDir = ''
        else:
            widgetDir = str(widgetInfo.directory)  #os.path.split(self.getFileName())[0]
        fullPaths = []
        for paths in [(self.widgetDir, widgetInfo.category), (self.widgetDir,), (self.picsDir,), tuple(), (widgetDir,), (widgetDir, "icons")]:
            for name in names + [iconName]:
                fname = os.path.join(*paths + (name,))
                if widgetInfo.module:
                    if pkg_resources.resource_exists(widgetInfo.module, fname):
                        # TODO: Optimize, we should not be required to extract the icon
                        fullPaths.append(pkg_resources.resource_filename(widgetInfo.module, fname))
                elif os.path.exists(fname):
                    fullPaths.append(fname)
            if len(fullPaths) > 1 and fullPaths[-1].endswith(iconName):
                fullPaths.pop()     # if we have the new icons we can remove the default icon
            if fullPaths != []:
                return fullPaths
        return [self.defaultPic]
    
    def getFullIconBackgroundName(self, widgetInfo):
        if widgetInfo.module:
            widgetDir = ''
        else:
            widgetDir = str(widgetInfo.directory)
        fullPaths = []
        for paths in [(widgetDir, "icons"), (self.widgetDir, widgetInfo.category, "icons"), (self.widgetDir, "icons"), (self.picsDir,), tuple(), (widgetDir,), (widgetDir, "icons")]:
            for name in ["background_%d.png" % num for num in [16, 32, 40, 48, 60]]:
                fname = os.path.join(*paths + (name,))
                if widgetInfo.module:
                    if pkg_resources.resource_exists(widgetInfo.module, fname):
                        # TODO: Optimize, we should not be required to extract the icon
                        fullPaths.append(pkg_resources.resource_filename(widgetInfo.module, fname))
                elif os.path.exists(fname):
                    fullPaths.append(fname)
            if fullPaths != []:
                return fullPaths    
        return [self.defaultBackground]
    
class MyStatusBar(QStatusBar):
    def __init__(self, parent):
        QStatusBar.__init__(self, parent)
        self.parentWidget = parent

    def mouseDoubleClickEvent(self, ev):
        self.parentWidget.menuItemShowOutputWindow()
        
class SizeGrip(QSizeGrip):
    def __init__(self, mainwindow):
        QSizeGrip.__init__(self, mainwindow)
        mainwindow.installEventFilter(self)
        self.updateMyPos(mainwindow)
        
    def eventFilter(self, obj, event):
        if obj is self.parent() and isinstance(event, QResizeEvent):
            self.updateMyPos(obj)
            
        return QSizeGrip.eventFilter(self, obj, event)
    
    def updateMyPos(self, mainwindow):
        window_size = mainwindow.size()
        mysize = self.size()
        self.move(window_size.width() - mysize.width(),
                  window_size.height() - mysize.height())
            
from collections import defaultdict
class EventNotifier(QObject):
    """ An Qt event notifier.
    """
    def __init__(self, parent=None):
        QObject.__init__(self, parent)
        self._filtering = set()
        self._attached = defaultdict(list)
        
    def attach(self, obj, event, slot):
        if hasattr(event, "__iter__"):
            events = list(event)
        else:
            events = [event]
        for e in events:
            self._attached[obj, e].append(slot)
        
        if obj not in self._filtering:
            self._filtering.add(obj)
            obj.installEventFilter(self)
            
    def detach(self, obj, event, slot=None):
        if hasattr(event, "__iter__"):
            events = list(event)
        else:
            events = [event]
        for e in events:
            slots = self._attached.get((obj, e), [])
            if slot is None:
                slots_to_remove = slots
            else:
                slots_to_remove = [slot]
            for s in slots_to_remove: 
                if s in slots:
                    slots.remove(s)
            if not slots:
                del self._attached[obj, e]
        
        if not any([s for (obj_, _), s in self._attached.items() \
                    if obj_ == obj]):
            # If obj has no more slots
            self._filtering.remove(obj)
            obj.removeEventFilter(self)
            
    def eventFilter(self, obj, event):
        if obj in self._filtering:
            if (obj, type(event)) in self._attached or (obj, event.type()) in self._attached:
                slots = self._attached.get((obj, type(event)), []) + \
                        self._attached.get((obj, event.type()), [])
                for slot in slots:
                    slot()
        return False
    
        
class OrangeQApplication(QApplication):
    def __init__(self, *args):
        QApplication.__init__(self, *args)
        
    #QFileOpenEvent are Mac OSX only
    if sys.platform == "darwin":
        def event(self, event):
            if event.type() == QEvent.FileOpen:
                file = str(event.file())
                def send():
                    if hasattr(qApp, "canvasDlg"):
                        qApp.canvasDlg.openSchema(file)
                    else:
                        QTimer.singleShot(100, send)
                send()
            return QApplication.event(self, event)
        
#    def notify(self, receiver, event):
#        eventDict = {0: 'None', 1: 'Timer', 2: 'MouseButtonPress', 3: 'MouseButtonRelease', 4: 'MouseButtonDblClick', 5: 'MouseMove', 6: 'KeyPress', 7: 'KeyRelease', 8: 'FocusIn', 9: 'FocusOut', 10: 'Enter', 11: 'Leave', 12: 'Paint', 13: 'Move', 14: 'Resize', 17: 'Show', 18: 'Hide', 19: 'Close', 21: 'ParentChange', 24: 'WindowActivate', 25: 'WindowDeactivate', 26: 'ShowToParent', 27: 'HideToParent', 31: 'Wheel', 33: 'WindowTitleChange', 34: 'WindowIconChange', 35: 'ApplicationWindowIconChange', 36: 'ApplicationFontChange', 37: 'ApplicationLayoutDirectionChange', 38: 'ApplicationPaletteChange', 39: 'PaletteChange', 40: 'Clipboard', 43: 'MetaCall', 50: 'SockAct', 51: 'ShortcutOverride', 52: 'DeferredDelete', 60: 'DragEnter', 61: 'DragMove', 62: 'DragLeave', 63: 'Drop', 68: 'ChildAdded', 69: 'ChildPolished', 70: 'ChildInserted', 71: 'ChildRemoved', 74: 'PolishRequest', 75: 'Polish', 76: 'LayoutRequest', 77: 'UpdateRequest', 78: 'UpdateLater', 82: 'ContextMenu', 83: 'InputMethod', 86: 'AccessibilityPrepare', 87: 'TabletMove', 88: 'LocaleChange', 89: 'LanguageChange', 90: 'LayoutDirectionChange', 92: 'TabletPress', 93: 'TabletRelease', 94: 'OkRequest', 96: 'IconDrag', 97: 'FontChange', 98: 'EnabledChange', 99: 'ActivationChange', 100: 'StyleChange', 101: 'IconTextChange', 102: 'ModifiedChange', 103: 'WindowBlocked', 104: 'WindowUnblocked', 105: 'WindowStateChange', 109: 'MouseTrackingChange', 110: 'ToolTip', 111: 'WhatsThis', 112: 'StatusTip', 113: 'ActionChanged', 114: 'ActionAdded', 115: 'ActionRemoved', 116: 'FileOpen', 117: 'Shortcut', 118: 'WhatsThisClicked', 119: 'AccessibilityHelp', 120: 'ToolBarChange', 121: 'ApplicationActivate', 122: 'ApplicationDeactivate', 123: 'QueryWhatsThis', 124: 'EnterWhatsThisMode', 125: 'LeaveWhatsThisMode', 126: 'ZOrderChange', 127: 'HoverEnter', 128: 'HoverLeave', 129: 'HoverMove', 130: 'AccessibilityDescription', 131: 'ParentAboutToChange', 132: 'WinEventAct', 150: 'EnterEditFocus', 151: 'LeaveEditFocus', 153: 'MenubarUpdated', 155: 'GraphicsSceneMouseMove', 156: 'GraphicsSceneMousePress', 157: 'GraphicsSceneMouseRelease', 158: 'GraphicsSceneMouseDoubleClick', 159: 'GraphicsSceneContextMenu', 160: 'GraphicsSceneHoverEnter', 161: 'GraphicsSceneHoverMove', 162: 'GraphicsSceneHoverLeave', 163: 'GraphicsSceneHelp', 164: 'GraphicsSceneDragEnter', 165: 'GraphicsSceneDragMove', 166: 'GraphicsSceneDragLeave', 167: 'GraphicsSceneDrop', 168: 'GraphicsSceneWheel', 169: 'KeyboardLayoutChange', 170: 'DynamicPropertyChange', 171: 'TabletEnterProximity', 172: 'TabletLeaveProximity', 173: 'NonClientAreaMouseMove', 174: 'NonClientAreaMouseButtonPress', 175: 'NonClientAreaMouseButtonRelease', 176: 'NonClientAreaMouseButtonDblClick', 177: 'MacSizeChange', 178: 'ContentsRectChange', 181: 'GraphicsSceneResize', 182: 'GraphicsSceneMove', 183: 'CursorChange', 184: 'ToolTipChange', 186: 'GrabMouse', 187: 'UngrabMouse', 188: 'GrabKeyboard', 189: 'UngrabKeyboard'}
#        import time
#        if isinstance(receiver, QWidget):
#            if str(receiver.windowTitle()) != "":
#                print time.strftime("%H:%M:%S"), "%15s %15s" % (str(receiver.windowTitle()) ,type(receiver).__name__)  + ": ",      # print only events for QWidget classes and up
#                if eventDict.has_key(event.type()):
#                    print eventDict[event.type()] 
#                else:
#                    print "unknown event name (" + str(event.type()) + ")"
#        else:
#            print time.strftime("%H:%M:%S"), type(receiver).__name__, str(receiver.objectName()),
#            if eventDict.has_key(event.type()):
#                print eventDict[event.type()] 
#            else:
#                print "unknown event name (" + str(event.type()) + ")"
#                
#        return QApplication.notify(self, receiver, event)


def main(argv=None):
    if argv == None:
        argv = sys.argv

    app = OrangeQApplication(sys.argv)
    dlg = OrangeCanvasDlg(app)
    qApp.canvasDlg = dlg
    dlg.show()
    for arg in sys.argv[1:]:
        if arg == "-reload":
            dlg.menuItemOpenLastSchema()
    r = app.exec_()
    app.closeAllWindows()
    
    del qApp.canvasDlg
    del dlg
    
    app.processEvents()
    
    # Call gc.collect before the app is destroyed to colect any remainig
    # cycles. Some sip objects are stored in it's global state (for instance
    # QGraphicsScene) and can cause a crash in Py_Finalize when sip trys to 
    # deallocate it (a bug in sip?).
    
    gc.collect()
    del app
    
    return r

if __name__ == "__main__":
    sys.exit(main())