qtdefines.py

################################################################################
#                                                                              #
# Copyright (C) 2011-2014, Armory Technologies, Inc.                           #
# Distributed under the GNU Affero General Public License (AGPL v3)            #
# See LICENSE or http://www.gnu.org/licenses/agpl.html                         #
#                                                                              #
################################################################################
import struct
from tempfile import mkstemp

from PyQt4.QtCore import *
from PyQt4.QtGui import *
import urllib

from armorycolors import Colors, htmlColor
from armoryengine.ArmoryUtils import *
from armoryengine.BinaryUnpacker import *
from armoryengine.MultiSigUtils import *


SETTINGS_PATH   = os.path.join(ARMORY_HOME_DIR, 'ArmorySettings.txt')
USERMODE        = enum('Standard', 'Advanced', 'Expert')
SATOSHIMODE     = enum('Auto', 'User')
NETWORKMODE     = enum('Offline', 'Full', 'Disconnected')
WLTTYPES        = enum('Plain', 'Crypt', 'WatchOnly', 'Offline')
WLTFIELDS       = enum('Name', 'Descr', 'WltID', 'NumAddr', 'Secure', \
                       'BelongsTo', 'Crypto', 'Time', 'Mem', 'Version')
MSGBOX          = enum('Good','Info', 'Question', 'Warning', 'Critical', 'Error')
MSGBOX          = enum('Good','Info', 'Question', 'Warning', 'Critical', 'Error')
DASHBTNS        = enum('Close', 'Browse', 'Install', 'Instruct', 'Settings')

STYLE_SUNKEN = QFrame.Box | QFrame.Sunken
STYLE_RAISED = QFrame.Box | QFrame.Raised
STYLE_PLAIN  = QFrame.Box | QFrame.Plain
STYLE_STYLED = QFrame.StyledPanel | QFrame.Raised
STYLE_NONE   = QFrame.NoFrame
VERTICAL = 'vertical'
HORIZONTAL = 'horizontal'
CHANGE_ADDR_DESCR_STRING = '[[ Change received ]]'
HTTP_VERSION_FILE = 'https://bitcoinarmory.com/versions.txt'
BUG_REPORT_URL = 'https://bitcoinarmory.com/scripts/receive_debug.php'
PRIVACY_URL = 'https://bitcoinarmory.com/privacy-policy'
# For announcements handling
ANNOUNCE_FETCH_INTERVAL = 1 * HOUR
if CLI_OPTIONS.testAnnounceCode:
   HTTP_ANNOUNCE_FILE = \
      'https://s3.amazonaws.com/bitcoinarmory-testing/testannounce.txt'
else:
   HTTP_ANNOUNCE_FILE = 'https://bitcoinarmory.com/atiannounce.txt'

# Keep track of dialogs and wizard that are executing
runningDialogsList = []

def AddToRunningDialogsList(func):
   def wrapper(*args, **kwargs):
      runningDialogsList.append(args[0])
      result = func(*args, **kwargs)
      runningDialogsList.remove(args[0])
      return result
   return wrapper

################################################################################
def tr(txt, replList=None, pluralList=None):
   """
   This is a common convention for implementing translations, where all 
   translatable strings are put int the _(...) function, and that method 
   does some fancy stuff to present the translation if needed. 

   This is being implemented here, to not only do translations in the 
   future, but also to clean up the typical text fields I use.  I've 
   ended up with a program full of stuff like this:

      myLabel = QRichLabel( \
         'This text is split across mulitple lines '
         'with a space after each one, and single '
         'quotes on either side.')
   
   Instead it should really look like: 
      
      myLabel = QRichLabel( tr('''
         This text is split across mulitple lines 
         and it will acquire a space after each line 
         as well as include newlines because it's HTML
         and uses <br>. ''' ))

   Added easy plural handling:

      Just add an extra argument to specify a variable on which plurality
      should be chosen, and then decorate your text with 

         @{singular|plural}@
   
   For instance:

      tr('The @{cat|cats}@ danced.  @{It was|They were}@ happy.', nCat)
      tr('The @{cat|%d cats}@ danced.  @{It was|They were}@ happy.'%nCat, nCat)
      tr('The @{cat|cats}@ attacked the @{dog|dogs}@', nCat, nDog)

   This should work well for 
   """

   txt = toUnicode(txt)
   lines = [l.strip() for l in txt.split('\n')]
   txt = (' '.join(lines)).strip()

   # Eventually we do something cool with this transalate function.
   # It will be defined elsewhere, but for now stubbed with identity fn
   TRANSLATE = lambda x: x

   txt = TRANSLATE(txt)

   return formatWithPlurals(txt, replList, pluralList)
   


################################################################################
def HLINE(style=QFrame.Plain):
   qf = QFrame()
   qf.setFrameStyle(QFrame.HLine | style)
   return qf

def VLINE(style=QFrame.Plain):
   qf = QFrame()
   qf.setFrameStyle(QFrame.VLine | style)
   return qf



# Setup fixed-width and var-width fonts
def GETFONT(ftype, sz=10, bold=False, italic=False):
   fnt = None
   if ftype.lower().startswith('fix'):
      if OS_WINDOWS:
         fnt = QFont("Courier", sz)
      elif OS_MACOSX:
         fnt = QFont("Menlo", sz)
      else: 
         fnt = QFont("DejaVu Sans Mono", sz)
   elif ftype.lower().startswith('var'):
      if OS_MACOSX:
         fnt = QFont("Lucida Grande", sz)
      else:
         fnt = QFont("Verdana", sz)
      #if OS_WINDOWS:
         #fnt = QFont("Tahoma", sz)
      #else: 
         #fnt = QFont("Sans", sz)
   elif ftype.lower().startswith('money'):
      if OS_WINDOWS:
         fnt = QFont("Courier", sz)
      elif OS_MACOSX:
         fnt = QFont("Menlo", sz)
      else: 
         fnt = QFont("DejaVu Sans Mono", sz)
   else:
      fnt = QFont(ftype, sz)

   if bold:
      fnt.setWeight(QFont.Bold)

   if italic:
      fnt.setItalic(True)
   
   return fnt
      

def UnicodeErrorBox(parent):
   QMessageBox.warning(parent, 'ASCII Error', \
      toUnicode('Armory does not currently support non-ASCII characters in '
      'most text fields (like \xc2\xa3\xc2\xa5\xc3\xa1\xc3\xb6\xc3\xa9).  '
      'Please use only letters found '
      'on an English(US) keyboard.  This will be fixed in an upcoming '
      'release'), QMessageBox.Ok)




#######
def UserModeStr(mode):
   if mode==USERMODE.Standard:
      return 'Standard'
   elif mode==USERMODE.Advanced:
      return 'Advanced'
   elif mode==USERMODE.Expert:
      return 'Expert'


#######
def tightSizeNChar(obj, nChar):
   """ 
   Approximates the size of a row text of mixed characters

   This is only aproximate, since variable-width fonts will vary
   depending on the specific text
   """

   try:
      fm = QFontMetricsF(QFont(obj.font()))
   except AttributeError:
      fm = QFontMetricsF(QFont(obj))
   szWidth,szHeight = fm.boundingRect('abcfgijklm').width(), fm.height()
   szWidth = int(szWidth * nChar/10.0 + 0.5)
   return szWidth, szHeight

#######
def tightSizeStr(obj, theStr):
   """ Measure a specific string """
   try:
      fm = QFontMetricsF(QFont(obj.font()))
   except AttributeError:
      fm = QFontMetricsF(QFont(obj))
   szWidth,szHeight = fm.boundingRect(theStr).width(), fm.height()
   return szWidth, szHeight
   
#######
def relaxedSizeStr(obj, theStr):
   """
   Approximates the size of a row text, nchars long, adds some margin
   """
   try:
      fm = QFontMetricsF(QFont(obj.font()))
   except AttributeError:
      fm = QFontMetricsF(QFont(obj))
   szWidth,szHeight = fm.boundingRect(theStr).width(), fm.height()
   return (10 + szWidth*1.05), 1.5*szHeight

#######
def relaxedSizeNChar(obj, nChar):
   """
   Approximates the size of a row text, nchars long, adds some margin
   """
   try:
      fm = QFontMetricsF(QFont(obj.font()))
   except AttributeError:
      fm = QFontMetricsF(QFont(obj))
   szWidth,szHeight = fm.boundingRect('abcfg ijklm').width(), fm.height()
   szWidth = int(szWidth * nChar/10.0 + 0.5)
   return (10 + szWidth*1.05), 1.5*szHeight

#############################################################################
def determineWalletType(wlt, wndw):
   if wlt.watchingOnly:
      if wndw.getWltSetting(wlt.uniqueIDB58, 'IsMine'):
         return [WLTTYPES.Offline, 'Offline']
      else:
         return [WLTTYPES.WatchOnly, 'Watching-Only']
   elif wlt.useEncryption:
      return [WLTTYPES.Crypt, 'Encrypted']
   else:
      return [WLTTYPES.Plain, 'No Encryption']





#############################################################################
def initialColResize(tblViewObj, sizeList):
   """
   We assume that all percentages are below 1, all fixed >1.  
   TODO:  This seems to almost work.  providing exactly 100% input will
          actually result in somewhere between 75% and 125% (approx).  
          For now, I have to experiment with initial values a few times
          before getting it to a satisfactory initial size.
   """   
   totalWidth = tblViewObj.width()
   fixedCols, pctCols = [],[]

   nCols = tblViewObj.model().columnCount()
   
   for col,colVal in enumerate(sizeList):
      if colVal > 1:
         fixedCols.append( (col, colVal) )
      else:
         pctCols.append( (col, colVal) )

   for c,sz in fixedCols:
      tblViewObj.horizontalHeader().resizeSection(c, sz)

   totalFixed = sum([sz[1] for sz in fixedCols])
   szRemain = totalWidth-totalFixed
   for c,pct in pctCols:
      tblViewObj.horizontalHeader().resizeSection(c, pct*szRemain)

   tblViewObj.horizontalHeader().setStretchLastSection(True)




class QRichLabel(QLabel):
   def __init__(self, txt, doWrap=True, \
                           hAlign=Qt.AlignLeft, \
                           vAlign=Qt.AlignVCenter, \
                           **kwargs):
      super(QRichLabel, self).__init__(txt)
      self.setTextFormat(Qt.RichText)
      self.setWordWrap(doWrap)
      self.setAlignment(hAlign | vAlign)
      self.setText(txt, **kwargs)
      # Fixes a problem with QLabel resizing based on content
      # ACR:  ... and makes other problems.  Removing for now.
      #self.setSizePolicy(QSizePolicy.Preferred, QSizePolicy.MinimumExpanding)
      #self.setMinimumHeight(int(relaxedSizeStr(self, 'QWERTYqypgj')[1]))

   def setText(self, text, color=None, size=None, bold=None, italic=None):
      text = unicode(text)
      if color:
         text = '<font color="%s">%s</font>' % (htmlColor(color), text)
      if size:
         if isinstance(size, int):
            text = '<font size=%d>%s</font>' % (size, text)
         else:
            text = '<font size="%s">%s</font>' % (size, text)
      if bold:
         text = '<b>%s</b>' % text
      if italic:
         text = '<i>%s</i>' % text

      super(QRichLabel, self).setText(text)

   def setBold(self):
      self.setText('<b>' + self.text() + '</b>')
      
   def setItalic(self):
      self.setText('<i>' + self.text() + '</i>')



class QMoneyLabel(QRichLabel):
   def __init__(self, nSatoshi, ndec=8, maxZeros=2, wColor=True, 
                              wBold=False, txtSize=10):
      QLabel.__init__(self, coin2str(nSatoshi))

      self.setValueText(nSatoshi, ndec, maxZeros, wColor, wBold, txtSize)


   def setValueText(self, nSatoshi, ndec=None, maxZeros=None, wColor=None, 
                                             wBold=None, txtSize=10):
      """
      When we set the text of the QMoneyLabel, remember previous values unless
      explicitly respecified
      """
      if not ndec is None:
         self.ndec = ndec

      if not maxZeros is None:
         self.max0 = maxZeros

      if not wColor is None:
         self.colr = wColor

      if not wBold is None:
         self.bold = wBold
         

      theFont = GETFONT("Fixed", txtSize)
      if self.bold:
         theFont.setWeight(QFont.Bold)

      self.setFont(theFont)
      self.setWordWrap(False)
      valStr = coin2str(nSatoshi, ndec=self.ndec, maxZeros=self.max0)
      goodMoney = htmlColor('MoneyPos')
      badMoney  = htmlColor('MoneyNeg')
      if nSatoshi < 0 and self.colr:
         self.setText('<font color=%s>%s</font>' % (badMoney, valStr))
      elif nSatoshi > 0 and self.colr:
         self.setText('<font color=%s>%s</font>' % (goodMoney, valStr))
      else:
         self.setText('%s' % valStr)
      self.setAlignment(Qt.AlignLeft | Qt.AlignVCenter)


def setLayoutStretchRows(layout, *args):
   for i,st in enumerate(args):
      layout.setRowStretch(i, st)

def setLayoutStretchCols(layout, *args):
   for i,st in enumerate(args):
      layout.setColumnStretch(i, st)

# Use this for QHBoxLayout and QVBoxLayout, where you don't specify dimension
def setLayoutStretch(layout, *args):
   for i,st in enumerate(args):
      layout.setStretch(i, st)

################################################################################
def QPixmapButton(img):
   btn = QPushButton('')
   px = QPixmap(img)
   btn.setIcon( QIcon(px))
   btn.setIconSize(px.rect().size())
   return btn
################################################################################
def QAcceptButton():
   return QPixmapButton('img/btnaccept.png')
def QCancelButton():
   return QPixmapButton('img/btncancel.png')
def QBackButton():
   return QPixmapButton('img/btnback.png')
def QOkButton():
   return QPixmapButton('img/btnok.png')
def QDoneButton():
   return QPixmapButton('img/btndone.png')
   

################################################################################
class QLabelButton(QLabel):
   mousePressOn = set()

   def __init__(self, txt):
      colorStr = htmlColor('LBtnNormalFG')
      QLabel.__init__(self, '<font color=%s>%s</u></font>' % (colorStr, txt))
      self.plainText = txt
      self.setAlignment(Qt.AlignHCenter | Qt.AlignVCenter)

  
   def sizeHint(self):
      w,h = relaxedSizeStr(self, self.plainText)
      return QSize(w,1.2*h)

   def mousePressEvent(self, ev):  
      # Prevent click-bleed-through to dialogs being opened
      txt = toBytes(unicode(self.text()))
      self.mousePressOn.add(txt)

   def mouseReleaseEvent(self, ev):  
      txt = toBytes(unicode(self.text()))
      if txt in self.mousePressOn:
         self.mousePressOn.remove(txt)
         self.emit(SIGNAL('clicked()'))  

   def enterEvent(self, ev):  
      ssStr = "QLabel { background-color : %s }" % htmlColor('LBtnHoverBG')
      self.setStyleSheet(ssStr)

   def leaveEvent(self, ev):
      ssStr = "QLabel { background-color : %s }" % htmlColor('LBtnNormalBG')
      self.setStyleSheet(ssStr)

################################################################################
# The optionalMsg argument is not word wrapped so the caller is responsible for limiting
# the length of the longest line in the optionalMsg
def MsgBoxCustom(wtype, title, msg, wCancel=False, yesStr=None, noStr=None, 
                                                      optionalMsg=None): 
   """
   Creates a message box with custom button text and icon
   """

   class dlgWarn(ArmoryDialog):
      def __init__(self, dtype, dtitle, wmsg, withCancel=False, yesStr=None, noStr=None):
         super(dlgWarn, self).__init__(None)
         
         msgIcon = QLabel()
         fpix = ''
         if dtype==MSGBOX.Good:
            fpix = ':/MsgBox_good48.png'
         if dtype==MSGBOX.Info:
            fpix = ':/MsgBox_info48.png'
         if dtype==MSGBOX.Question:
            fpix = ':/MsgBox_question64.png'
         if dtype==MSGBOX.Warning:
            fpix = ':/MsgBox_warning48.png'
         if dtype==MSGBOX.Critical:
            fpix = ':/MsgBox_critical64.png'
         if dtype==MSGBOX.Error:
            fpix = ':/MsgBox_error64.png'
   
   
         if len(fpix)>0:
            msgIcon.setPixmap(QPixmap(fpix))
            msgIcon.setAlignment(Qt.AlignHCenter | Qt.AlignTop)
   
         lblMsg = QLabel(msg)
         lblMsg.setTextFormat(Qt.RichText)
         lblMsg.setWordWrap(True)
         lblMsg.setAlignment(Qt.AlignLeft | Qt.AlignVCenter)
         lblMsg.setOpenExternalLinks(True)
         w,h = tightSizeNChar(lblMsg, 70)
         lblMsg.setMinimumSize( w, 3.2*h )
         buttonbox = QDialogButtonBox()

         if dtype==MSGBOX.Question:
            if not yesStr: yesStr = '&Yes'
            if not noStr:  noStr = '&No'
            btnYes = QPushButton(yesStr)
            btnNo  = QPushButton(noStr)
            self.connect(btnYes, SIGNAL('clicked()'), self.accept)
            self.connect(btnNo,  SIGNAL('clicked()'), self.reject)
            buttonbox.addButton(btnYes,QDialogButtonBox.AcceptRole)
            buttonbox.addButton(btnNo, QDialogButtonBox.RejectRole)
         else:
            cancelStr = '&Cancel' if (noStr is not None or withCancel) else ''
            yesStr    = '&OK' if (yesStr is None) else yesStr
            btnOk     = QPushButton(yesStr)
            btnCancel = QPushButton(cancelStr)
            self.connect(btnOk,     SIGNAL('clicked()'), self.accept)
            self.connect(btnCancel, SIGNAL('clicked()'), self.reject)
            buttonbox.addButton(btnOk, QDialogButtonBox.AcceptRole)
            if cancelStr:
               buttonbox.addButton(btnCancel, QDialogButtonBox.RejectRole)

         spacer = QSpacerItem(20, 10, QSizePolicy.Fixed, QSizePolicy.Expanding)

         layout = QGridLayout()
         layout.addItem(  spacer,         0,0, 1,2)
         layout.addWidget(msgIcon,        1,0, 1,1)
         layout.addWidget(lblMsg,         1,1, 1,1)
         if optionalMsg:
            optionalTextLabel = QLabel(optionalMsg)
            optionalTextLabel.setTextFormat(Qt.RichText)
            optionalTextLabel.setAlignment(Qt.AlignLeft | Qt.AlignVCenter)
            w,h = tightSizeNChar(optionalTextLabel, 70)
            optionalTextLabel.setMinimumSize( w, 3.2*h )
            layout.addWidget(optionalTextLabel, 2,0,1,2)
         layout.addWidget(buttonbox, 3,0, 1,2)
         layout.setSpacing(20)
         self.setLayout(layout)
         self.setWindowTitle(dtitle)

   dlg = dlgWarn(wtype, title, msg, wCancel, yesStr, noStr) 
   result = dlg.exec_()
   
   return result


################################################################################
def MsgBoxWithDNAA(wtype, title, msg, dnaaMsg, wCancel=False, \
                   yesStr='Yes', noStr='No', dnaaStartChk=False):
   """
   Creates a warning/question/critical dialog, but with a "Do not ask again"
   checkbox.  Will return a pair  (response, DNAA-is-checked)
   """

   class dlgWarn(ArmoryDialog):
      def __init__(self, dtype, dtitle, wmsg, dmsg=None, withCancel=False): 
         super(dlgWarn, self).__init__(None)
         
         msgIcon = QLabel()
         fpix = ''
         if dtype==MSGBOX.Info:
            fpix = ':/MsgBox_info48.png'
            if not dmsg:  dmsg = 'Do not show this message again'
         if dtype==MSGBOX.Question:
            fpix = ':/MsgBox_question64.png'
            if not dmsg:  dmsg = 'Do not ask again'
         if dtype==MSGBOX.Warning:
            fpix = ':/MsgBox_warning48.png'
            if not dmsg:  dmsg = 'Do not show this warning again'
         if dtype==MSGBOX.Critical:
            fpix = ':/MsgBox_critical64.png'
            if not dmsg:  dmsg = None  # should always show crits
         if dtype==MSGBOX.Error:
            fpix = ':/MsgBox_error64.png'
            if not dmsg:  dmsg = None  # should always show errors
   
   
         if len(fpix)>0:
            msgIcon.setPixmap(QPixmap(fpix))
            msgIcon.setAlignment(Qt.AlignHCenter | Qt.AlignVCenter)
   
         self.chkDnaa = QCheckBox(dmsg)
         self.chkDnaa.setChecked(dnaaStartChk)
         lblMsg = QLabel(msg)
         lblMsg.setTextFormat(Qt.RichText)
         lblMsg.setWordWrap(True)
         lblMsg.setAlignment(Qt.AlignLeft | Qt.AlignVCenter)
         w,h = tightSizeNChar(lblMsg, 50)
         lblMsg.setMinimumSize( w, 3.2*h )
         lblMsg.setOpenExternalLinks(True)

         buttonbox = QDialogButtonBox()

         if dtype==MSGBOX.Question:
            btnYes = QPushButton(yesStr)
            btnNo  = QPushButton(noStr)
            self.connect(btnYes, SIGNAL('clicked()'), self.accept)
            self.connect(btnNo,  SIGNAL('clicked()'), self.reject)
            buttonbox.addButton(btnYes,QDialogButtonBox.AcceptRole)
            buttonbox.addButton(btnNo, QDialogButtonBox.RejectRole)
         else:
            btnOk = QPushButton('Ok')
            self.connect(btnOk, SIGNAL('clicked()'), self.accept)
            buttonbox.addButton(btnOk, QDialogButtonBox.AcceptRole)
            if withCancel:
               btnOk = QPushButton('Cancel')
               self.connect(btnOk, SIGNAL('clicked()'), self.reject)
               buttonbox.addButton(btnOk, QDialogButtonBox.RejectRole)
            

         spacer = QSpacerItem(20, 10, QSizePolicy.Fixed, QSizePolicy.Expanding)


         layout = QGridLayout()
         layout.addItem(  spacer,         0,0, 1,2)
         layout.addWidget(msgIcon,        1,0, 1,1)
         layout.addWidget(lblMsg,         1,1, 1,1)
         layout.addWidget(self.chkDnaa,   2,0, 1,2)
         layout.addWidget(buttonbox,      3,0, 1,2)
         layout.setSpacing(20)
         self.setLayout(layout)
         self.setWindowTitle(dtitle)


   dlg = dlgWarn(wtype, title, msg, dnaaMsg, wCancel) 
   result = dlg.exec_()
   
   return (result, dlg.chkDnaa.isChecked())

 
def makeLayoutFrame(dirStr, widgetList, style=QFrame.NoFrame, condenseMargins=False):
   frm = QFrame()
   frm.setFrameStyle(style)

   frmLayout = QHBoxLayout()
   if dirStr.lower().startswith(VERTICAL):
      frmLayout = QVBoxLayout()
      
   for w in widgetList:
      if isinstance(w,str) and w.lower()=='stretch':
         frmLayout.addStretch()
      elif isinstance(w,str) and w.lower().startswith('space'):
         # expect "spacer(30)"
         first = w.index('(')+1 
         last  = w.index(')')
         wid,hgt = int(w[first:last]), 1
         if dirStr.lower().startswith(VERTICAL):
            wid,hgt = hgt,wid
         frmLayout.addItem( QSpacerItem(wid,hgt) )
      elif isinstance(w,str) and w.lower().startswith('line'):
         frmLine = QFrame()
         if dirStr.lower().startswith(VERTICAL):
            frmLine.setFrameStyle(QFrame.HLine | QFrame.Plain)
         else:
            frmLine.setFrameStyle(QFrame.VLine | QFrame.Plain)
         frmLayout.addWidget(frmLine)
      elif isinstance(w,str) and w.lower().startswith('strut'):
         first = w.index('(')+1 
         last  = w.index(')')
         strutSz = int(w[first:last])
         frmLayout.addStrut(strutSz)
      elif isinstance(w,QSpacerItem):
         frmLayout.addItem(w)
      else:
         frmLayout.addWidget(w)

   if condenseMargins:
      frmLayout.setContentsMargins(3,3,3,3)
      frmLayout.setSpacing(3)
   else:
      frmLayout.setContentsMargins(5,5,5,5)
   frm.setLayout(frmLayout)
   return frm
   

def addFrame(widget, style=STYLE_SUNKEN, condenseMargins=False):
   return makeLayoutFrame(HORIZONTAL, [widget], style, condenseMargins)
   
def makeVertFrame(widgetList, style=QFrame.NoFrame, condenseMargins=False):
   return makeLayoutFrame(VERTICAL, widgetList, style, condenseMargins)

def makeHorizFrame(widgetList, style=QFrame.NoFrame, condenseMargins=False):
   return makeLayoutFrame(HORIZONTAL, widgetList, style, condenseMargins)


def QImageLabel(imgfn, size=None, stretch='NoStretch'):

   lbl = QLabel()

   if size==None:
      px = QPixmap(imgfn)
   else:
      px = QPixmap(imgfn).scaled(*size)  # expect size=(W,H)

   lbl.setPixmap(px)
   return lbl
   



def restoreTableView(qtbl, hexBytes):
   try:
      binunpack = BinaryUnpacker(hex_to_binary(hexBytes))
      hexByte = binunpack.get(UINT8)
      binLen = binunpack.get(UINT8)
      toRestore = []
      for i in range(binLen):
         sz = binunpack.get(UINT16)
         if sz>0:
            toRestore.append([i,sz])
         
      for i,c in toRestore[:-1]:
         qtbl.setColumnWidth(i, c)
   except Exception, e:
      print 'ERROR!'
      pass
      # Don't want to crash the program just because couldn't load tbl data


def saveTableView(qtbl):
   nCol = qtbl.model().columnCount()
   sz = [None]*nCol
   for i in range(nCol):
      sz[i] = qtbl.columnWidth(i)      

   # Use 'ff' as a kind of magic byte for this data.  Most importantly
   # we want to guarantee that the settings file will interpret this
   # as hex data -- I once had an unlucky hex string written out with 
   # all digits and then intepretted as an integer on the next load :( 
   first = int_to_hex(nCol)
   rest  = [int_to_hex(s, widthBytes=2) for s in sz]
   return 'ff' + first + ''.join(rest)





################################################################################
# This class is intended to be an abstract frame class that
# will hold all of the functionality that is common to all 
# Frames used in Armory. 
# The Frames that extend this class should contain all of the
# display and control components for some screen used in Armory
# Putting this content in a frame allows it to be used on it's own
# in a dialog or as a component in a larger frame.
class ArmoryFrame(QFrame):
   def __init__(self, parent, main):
      super(ArmoryFrame, self).__init__(parent)
      self.main = main

      # Subclasses should implement a method that returns a boolean to control
      # when done, accept, next, or final button should be enabled.
      self.isComplete = None


################################################################################
class ArmoryDialog(QDialog):
   def __init__(self, parent=None, main=None):
      super(ArmoryDialog, self).__init__(parent)

      self.parent = parent
      self.main   = main

      self.setFont(GETFONT('var'))
      self.setWindowFlags(Qt.Window)

      if USE_TESTNET:
         self.setWindowTitle('Armory - Bitcoin Wallet Management [TESTNET]')
         self.setWindowIcon(QIcon(':/armory_icon_green_32x32.png'))
      else:
         self.setWindowTitle('Armory - Bitcoin Wallet Management')
         self.setWindowIcon(QIcon(':/armory_icon_32x32.png'))
   
   @AddToRunningDialogsList
   def exec_(self):
      return super(ArmoryDialog, self).exec_()
      

################################################################################
class QRCodeWidget(QWidget):

   def __init__(self, asciiToEncode='', prefSize=160, errLevel='L', parent=None):
      super(QRCodeWidget, self).__init__()

      self.parent = parent
      self.qrmtrx = None
      self.setAsciiData(asciiToEncode, prefSize, errLevel, repaint=False)
      

   def setAsciiData(self, newAscii, prefSize=160, errLevel='L', repaint=True):
      if len(newAscii)==0:
         self.qrmtrx = [[0]]
         self.modCt  = 1
         self.pxScale= 1
         return

      self.theData = newAscii
      self.qrmtrx, self.modCt = CreateQRMatrix(self.theData, errLevel)
      self.setPreferredSize(prefSize)


      
            
   def getModuleCount1D(self):
      return self.modCt


   def setPreferredSize(self, px, policy='Approx'):
      self.pxScale,rem = divmod(int(px), int(self.modCt))

      if policy.lower().startswith('approx'):
         if rem>self.modCt/2.0:
            self.pxScale += 1
      elif policy.lower().startswith('atleast'):
         if rem>0:
            self.pxScale += 1
      elif policy.lower().startswith('max'):
         pass
      else:
         LOGERROR('Bad size policy in set qr size')
         return self.pxScale*self.modCt

      return
      

   def getSize(self):
      return self.pxScale*self.modCt

       
   def sizeHint(self):
      sz1d = self.pxScale*self.modCt
      return QSize(sz1d, sz1d)


   def paintEvent(self, e):
      qp = QPainter()
      qp.begin(self)
      self.drawWidget(qp)
      qp.end()



   def drawWidget(self, qp):
      # In case this is not a white background, draw the white boxes
      qp.setPen(QColor(255,255,255))
      qp.setBrush(QColor(255,255,255))
      for r in range(self.modCt):
         for c in range(self.modCt):
            if not self.qrmtrx[r][c]:
               qp.drawRect(*[a*self.pxScale for a in [r,c,1,1]])

      # Draw the black tiles
      qp.setPen(QColor(0,0,0))
      qp.setBrush(QColor(0,0,0))
      for r in range(self.modCt):
         for c in range(self.modCt):
            if self.qrmtrx[r][c]:
               qp.drawRect(*[a*self.pxScale for a in [r,c,1,1]])


   def mouseDoubleClickEvent(self, *args):
      DlgInflatedQR(self.parent, self.theData).exec_()
            
            
# Create a very simple dialog and execute it
class DlgInflatedQR(ArmoryDialog):
   def __init__(self, parent, dataToQR):
      super(DlgInflatedQR, self).__init__(parent)

      sz = QApplication.desktop().size()
      w,h = sz.width(), sz.height()
      qrSize = int(min(w,h)*0.8)
      qrDisp = QRCodeWidget(dataToQR, prefSize=qrSize)

      def closeDlg(*args): 
         self.accept()
      qrDisp.mouseDoubleClickEvent = closeDlg
      self.mouseDoubleClickEvent = closeDlg

      lbl = QRichLabel('<b>Double-click or press ESC to close</b>')
      lbl.setAlignment(Qt.AlignTop | Qt.AlignHCenter)

      frmQR = makeHorizFrame(['Stretch', qrDisp, 'Stretch'])
      frmFull = makeVertFrame(['Stretch',frmQR, lbl, 'Stretch'])

      layout = QVBoxLayout()
      layout.addWidget(frmFull)

      self.setLayout(layout)
      self.showFullScreen()
      





# Pure-python BMP creator taken from:
#
#     http://pseentertainmentcorp.com/smf/index.php?topic=2034.0
#
# This will take a 2D array of ones-and-zeros and convert it to a binary
# bitmap image, which will be stored in a temporary file.  This temporary
# file can be used for display and copy-and-paste into email.

def bmp_binary(header, pixels):
   '''It takes a header (based on default_bmp_header), 
   the pixel data (from structs, as produced by get_color and row_padding),
   and writes it to filename'''
   header_str = ""
   header_str += struct.pack('<B', header['mn1'])
   header_str += struct.pack('<B', header['mn2'])
   header_str += struct.pack('<L', header['filesize'])
   header_str += struct.pack('<H', header['undef1'])
   header_str += struct.pack('<H', header['undef2'])
   header_str += struct.pack('<L', header['offset'])
   header_str += struct.pack('<L', header['headerlength'])
   header_str += struct.pack('<L', header['width'])
   header_str += struct.pack('<L', header['height'])
   header_str += struct.pack('<H', header['colorplanes'])
   header_str += struct.pack('<H', header['colordepth'])
   header_str += struct.pack('<L', header['compression'])
   header_str += struct.pack('<L', header['imagesize'])
   header_str += struct.pack('<L', header['res_hor'])
   header_str += struct.pack('<L', header['res_vert'])
   header_str += struct.pack('<L', header['palette'])
   header_str += struct.pack('<L', header['importantcolors'])
   return header_str + pixels

def bmp_write(header, pixels, filename):
   out = open(filename, 'wb')
   out.write(bmp_binary(header, pixels))
   out.close()

def bmp_row_padding(width, colordepth):
   '''returns any necessary row padding'''
   byte_length = width*colordepth/8
   # how many bytes are needed to make byte_length evenly divisible by 4?
   padding = (4-byte_length)%4 
   padbytes = ''
   for i in range(padding):
      x = struct.pack('<B',0)
      padbytes += x
   return padbytes

def bmp_pack_color(red, green, blue):
   '''accepts values from 0-255 for each value, returns a packed string'''
   return struct.pack('<BBB',blue,green,red)


###################################   
BMP_TEMPFILE = -1
def createBitmap(imgMtrx2D, writeToFile=-1, returnBinary=True):
   try:
      h,w = len(imgMtrx2D), len(imgMtrx2D[0])
   except:
      LOGERROR('Error creating BMP object')
      raise

   header = {'mn1':66,
             'mn2':77,
             'filesize':0,
             'undef1':0,
             'undef2':0,
             'offset':54,
             'headerlength':40,
             'width':w,
             'height':h,
             'colorplanes':0,
             'colordepth':24,
             'compression':0,
             'imagesize':0,
             'res_hor':0,
             'res_vert':0,
             'palette':0,
             'importantcolors':0}

   pixels = ''
   black = bmp_pack_color(  0,  0,  0)
   white = bmp_pack_color(255,255,255)
   for row in range(header['height']-1,-1,-1):# (BMPs are L to R from the bottom L row)
      for col in range(header['width']):
         pixels += black if imgMtrx2D[row][col] else white
      pixels += bmp_row_padding(header['width'], header['colordepth'])
      
   if returnBinary:
      return bmp_binary(header,pixels)
   elif writeToFile==BMP_TEMPFILE:
      handle,temppath = mkstemp(suffix='.bmp')
      bmp_write(header, pixels, temppath)
      return temppath
   else:
      try:
         bmp_write(header, pixels, writeToFile)
         return True
      except:
         return False
      


def selectFileForQLineEdit(parent, qObj, title="Select File", existing=False, \
                           ffilter=[]):

   types = list(ffilter)
   types.append('All files (*)')
   typesStr = ';; '.join(types)
   if not OS_MACOSX:
      fullPath = unicode(QFileDialog.getOpenFileName(parent, \
         title, ARMORY_HOME_DIR, typesStr))
   else:
      fullPath = unicode(QFileDialog.getOpenFileName(parent, \
         title, ARMORY_HOME_DIR, typesStr, options=QFileDialog.DontUseNativeDialog))

   if fullPath:
      qObj.setText( fullPath)
   

def selectDirectoryForQLineEdit(par, qObj, title="Select Directory"):
   initPath = ARMORY_HOME_DIR
   currText = unicode(qObj.text()).strip()
   if len(currText)>0:
      if os.path.exists(currText):
         initPath = currText
    
   if not OS_MACOSX:
      fullPath = unicode(QFileDialog.getExistingDirectory(par, title, initPath))
   else:
      fullPath = unicode(QFileDialog.getExistingDirectory(par, title, initPath, \
                                       options=QFileDialog.DontUseNativeDialog))
   if fullPath:
      qObj.setText( fullPath)
    

def createDirectorySelectButton(parent, targetWidget, title="Select Directory"):

   btn = QPushButton('')
   ico = QIcon(QPixmap(':/folder24.png')) 
   btn.setIcon(ico)


   fn = lambda: selectDirectoryForQLineEdit(parent, targetWidget, title)
   parent.connect(btn, SIGNAL('clicked()'), fn)
   return btn