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