vcs.maemo.org Git - ejpi/blob - src/qhistory.py

   1 #!/usr/bin/env python
   2
   3 """
   4 http://www.grigoriev.ru/svgmath/ (MathML->SVG in Python)
   5 http://helm.cs.unibo.it/mml-widget/ (MathML widget in C++)
   6 """
   7
   8 import logging
   9
  10 from PyQt4 import QtGui
  11 from PyQt4 import QtCore
  12
  13 import maeqt
  14 import util.misc as misc_utils
  15 import history
  16 import operation
  17
  18
  19 _moduleLogger = logging.getLogger(__name__)
  20
  21
  22 class QCalcHistory(history.AbstractHistory):
  23
  24         _CLOSE_COLUMN = 0
  25         _EQ_COLUMN = 1
  26         _RESULT_COLUMN = 2
  27
  28         def __init__(self, errorReporter):
  29                 super(QCalcHistory, self).__init__()
  30                 self._prettyRenderer = operation.render_number()
  31                 self._errorReporter = errorReporter
  32
  33                 self._historyStore = QtGui.QStandardItemModel()
  34                 self._historyStore.setHorizontalHeaderLabels(["", "Equation", "Result"])
  35                 self._historyStore.itemChanged.connect(self._on_item_changed)
  36
  37                 self._historyView = QtGui.QTreeView()
  38                 self._historyView.setModel(self._historyStore)
  39                 self._historyView.setUniformRowHeights(True)
  40                 self._historyView.setRootIsDecorated(False)
  41                 self._historyView.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
  42                 self._historyView.setSelectionBehavior(QtGui.QAbstractItemView.SelectRows)
  43                 self._historyView.setSelectionMode(QtGui.QAbstractItemView.SingleSelection)
  44                 self._historyView.setHeaderHidden(True)
  45                 self._historyView.activated.connect(self._on_row_activated)
  46
  47                 viewHeader = self._historyView.header()
  48                 viewHeader.setSortIndicatorShown(True)
  49                 viewHeader.setClickable(True)
  50
  51                 viewHeader.setResizeMode(self._CLOSE_COLUMN, QtGui.QHeaderView.ResizeToContents)
  52                 viewHeader.setResizeMode(self._EQ_COLUMN, QtGui.QHeaderView.Stretch)
  53                 viewHeader.setResizeMode(self._RESULT_COLUMN, QtGui.QHeaderView.ResizeToContents)
  54                 viewHeader.setStretchLastSection(False)
  55
  56                 self._rowCount = 0
  57                 self._programmaticUpdate = False
  58                 self._closeIcon = maeqt.get_theme_icon(("window-close", "general_close", "gtk-close"))
  59
  60         @property
  61         def toplevel(self):
  62                 return self._historyView
  63
  64         @property
  65         def errorReporter(self):
  66                 return self._errorReporter
  67
  68         def push(self, node):
  69                 simpleNode = node.simplify()
  70
  71                 closeIcon = self._closeIcon
  72                 icon = QtGui.QStandardItem(closeIcon, "")
  73                 icon.setEditable(False)
  74                 icon.setCheckable(False)
  75                 equation = QtGui.QStandardItem(operation.render_operation(self._prettyRenderer, node))
  76                 equation.setData(node)
  77                 equation.setCheckable(False)
  78                 eqFont = equation.font()
  79                 eqFont.setPointSize(max(eqFont.pointSize() - 3, 5))
  80                 equation.setFont(eqFont)
  81
  82                 result = QtGui.QStandardItem(operation.render_operation(self._prettyRenderer, simpleNode))
  83                 result.setData(simpleNode)
  84                 result.setEditable(False)
  85                 result.setCheckable(False)
  86
  87                 row = (icon, equation, result)
  88                 self._historyStore.appendRow(row)
  89
  90                 index = result.index()
  91                 self._historyView.scrollTo(index)
  92                 self._rowCount += 1
  93
  94         def pop(self):
  95                 if len(self) == 0:
  96                         raise IndexError("Not enough items in the history for the operation")
  97
  98                 icon, equation, result = self._historyStore.takeRow(self._rowCount - 1)
  99                 self._rowCount -= 1
 100                 return equation.data().toPyObject()
 101
 102         def peek(self):
 103                 if len(self) == 0:
 104                         raise IndexError("Not enough items in the history for the operation")
 105
 106                 icon, equation, result = self._historyStore.takeRow(self._rowCount - 1)
 107                 row = (icon, equation, result)
 108                 self._historyStore.appendRow(row)
 109
 110                 return equation.data().toPyObject()
 111
 112         def clear(self):
 113                 self._historyStore.clear()
 114                 self._rowCount = 0
 115
 116         @misc_utils.log_exception(_moduleLogger)
 117         def _on_row_activated(self, index):
 118                 if index.column() == self._CLOSE_COLUMN:
 119                         self._historyStore.removeRow(index.row(), index.parent())
 120                         self._rowCount -= 1
 121                 elif index.column() == self._EQ_COLUMN:
 122                         self._duplicate_row(index)
 123                 elif index.column() == self._RESULT_COLUMN:
 124                         self._duplicate_row(index)
 125                 else:
 126                         raise NotImplementedError("Unsupported column to activate %s" % index.column())
 127
 128         @misc_utils.log_exception(_moduleLogger)
 129         def _on_item_changed(self, item):
 130                 if self._programmaticUpdate:
 131                         _moduleLogger.info("Blocking updating %r recursively" % item)
 132                         return
 133                 self._programmaticUpdate = True
 134                 try:
 135                         if item.column() in [self._EQ_COLUMN, self._RESULT_COLUMN]:
 136                                 self._update_input(item)
 137                         else:
 138                                 raise NotImplementedError("Unsupported column to edit %s" % item.column())
 139                 except StandardError, e:
 140                         self.errorReporter.push_exception()
 141                 finally:
 142                         self._programmaticUpdate = False
 143
 144         def _duplicate_row(self, index):
 145                 item = self._historyStore.item(index.row(), self._EQ_COLUMN)
 146                 self.push(item.data().toPyObject())
 147
 148         def _parse_value(self, value):
 149                 raise NotImplementedError("What?")
 150
 151         def _update_input(self, item):
 152                 node = item.data().toPyObject()
 153                 try:
 154                         eqNode = self._parse_value(str(item.text()))
 155                         newText = operation.render_operation(self._prettyRenderer, eqNode)
 156
 157                         eqItem = self._historyStore.item(item.row(), self._EQ_COLUMN)
 158                         eqItem.setData(eqNode)
 159                         eqItem.setText(newText)
 160
 161                         resultNode = eqNode.simplify()
 162                         resultText = operation.render_operation(self._prettyRenderer, resultNode)
 163                         resultItem = self._historyStore.item(item.row(), self._RESULT_COLUMN)
 164                         resultItem.setData(resultNode)
 165                         resultItem.setText(resultText)
 166                 except:
 167                         oldText = operation.render_operation(self._prettyRenderer, node)
 168                         item.setText(oldText)
 169                         raise
 170
 171         def __len__(self):
 172                 return self._rowCount
 173
 174         def __iter__(self):
 175                 for i in xrange(self._rowCount):
 176                         item = self._historyStore.item(i, self._EQ_COLUMN)
 177                         if item is None:
 178                                 continue
 179                         yield item.data().toPyObject()