git.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.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
  41                 self._historyView.setSelectionBehavior(QtGui.QAbstractItemView.SelectRows)
  42                 self._historyView.setSelectionMode(QtGui.QAbstractItemView.SingleSelection)
  43                 self._historyView.setHeaderHidden(True)
  44                 self._historyView.activated.connect(self._on_row_activated)
  45
  46                 viewHeader = self._historyView.header()
  47                 viewHeader.setSortIndicatorShown(True)
  48                 viewHeader.setClickable(True)
  49
  50                 viewHeader.setResizeMode(self._CLOSE_COLUMN, QtGui.QHeaderView.ResizeToContents)
  51                 viewHeader.setResizeMode(self._EQ_COLUMN, QtGui.QHeaderView.Stretch)
  52                 viewHeader.setResizeMode(self._RESULT_COLUMN, QtGui.QHeaderView.ResizeToContents)
  53                 viewHeader.setStretchLastSection(False)
  54
  55                 self._rowCount = 0
  56                 self._programmaticUpdate = False
  57                 self._closeIcon = maeqt.get_theme_icon(("window-close", "general_close", "gtk-close"))
  58
  59         @property
  60         def toplevel(self):
  61                 return self._historyView
  62
  63         @property
  64         def errorReporter(self):
  65                 return self._errorReporter
  66
  67         def push(self, node):
  68                 simpleNode = node.simplify()
  69
  70                 closeIcon = self._closeIcon
  71                 icon = QtGui.QStandardItem(closeIcon, "")
  72                 icon.setEditable(False)
  73                 icon.setCheckable(False)
  74                 equation = QtGui.QStandardItem(operation.render_operation(self._prettyRenderer, node))
  75                 equation.setData(node)
  76                 equation.setCheckable(False)
  77                 result = QtGui.QStandardItem(operation.render_operation(self._prettyRenderer, simpleNode))
  78                 result.setData(simpleNode)
  79                 result.setEditable(False)
  80                 result.setCheckable(False)
  81
  82                 row = (icon, equation, result)
  83                 self._historyStore.appendRow(row)
  84
  85                 index = result.index()
  86                 self._historyView.scrollTo(index)
  87                 self._rowCount += 1
  88
  89         def pop(self):
  90                 if len(self) == 0:
  91                         raise IndexError("Not enough items in the history for the operation")
  92
  93                 icon, equation, result = self._historyStore.takeRow(self._rowCount - 1)
  94                 self._rowCount -= 1
  95                 return equation.data().toPyObject()
  96
  97         def peek(self):
  98                 if len(self) == 0:
  99                         raise IndexError("Not enough items in the history for the operation")
 100
 101                 icon, equation, result = self._historyStore.takeRow(self._rowCount - 1)
 102                 row = (icon, equation, result)
 103                 self._historyStore.appendRow(row)
 104
 105                 return equation.data().toPyObject()
 106
 107         def clear(self):
 108                 self._historyStore.clear()
 109                 self._rowCount = 0
 110
 111         @misc_utils.log_exception(_moduleLogger)
 112         def _on_row_activated(self, index):
 113                 if index.column() == self._CLOSE_COLUMN:
 114                         self._historyStore.removeRow(index.row(), index.parent())
 115                         self._rowCount -= 1
 116                 elif index.column() == self._EQ_COLUMN:
 117                         self._duplicate_row(index)
 118                 elif index.column() == self._RESULT_COLUMN:
 119                         self._duplicate_row(index)
 120                 else:
 121                         raise NotImplementedError("Unsupported column to activate %s" % index.column())
 122
 123         @misc_utils.log_exception(_moduleLogger)
 124         def _on_item_changed(self, item):
 125                 if self._programmaticUpdate:
 126                         _moduleLogger.info("Blocking updating %r recursively" % item)
 127                         return
 128                 self._programmaticUpdate = True
 129                 try:
 130                         if item.column() in [self._EQ_COLUMN, self._RESULT_COLUMN]:
 131                                 self._update_input(item)
 132                         else:
 133                                 raise NotImplementedError("Unsupported column to edit %s" % item.column())
 134                 except StandardError, e:
 135                         self.errorReporter.push_exception()
 136                 finally:
 137                         self._programmaticUpdate = False
 138
 139         def _duplicate_row(self, index):
 140                 item = self._historyStore.item(index.row(), self._EQ_COLUMN)
 141                 self.push(item.data().toPyObject())
 142
 143         def _parse_value(self, value):
 144                 raise NotImplementedError("What?")
 145
 146         def _update_input(self, item):
 147                 node = item.data().toPyObject()
 148                 try:
 149                         eqNode = self._parse_value(str(item.text()))
 150                         newText = operation.render_operation(self._prettyRenderer, eqNode)
 151
 152                         eqItem = self._historyStore.item(item.row(), self._EQ_COLUMN)
 153                         eqItem.setData(eqNode)
 154                         eqItem.setText(newText)
 155
 156                         resultNode = eqNode.simplify()
 157                         resultText = operation.render_operation(self._prettyRenderer, resultNode)
 158                         resultItem = self._historyStore.item(item.row(), self._RESULT_COLUMN)
 159                         resultItem.setData(resultNode)
 160                         resultItem.setText(resultText)
 161                 except:
 162                         oldText = operation.render_operation(self._prettyRenderer, node)
 163                         item.setText(oldText)
 164                         raise
 165
 166         def __len__(self):
 167                 return self._rowCount
 168
 169         def __iter__(self):
 170                 for i in xrange(self._rowCount):
 171                         item = self._historyStore.item(i, self._EQ_COLUMN)
 172                         if item is None:
 173                                 continue
 174                         yield item.data().toPyObject()