4 http://www.grigoriev.ru/svgmath/ (MathML->SVG in Python)
5 http://helm.cs.unibo.it/mml-widget/ (MathML widget in C++)
10 from PyQt4 import QtGui
11 from PyQt4 import QtCore
13 import util.misc as misc_utils
18 _moduleLogger = logging.getLogger(__name__)
21 class QCalcHistory(history.AbstractHistory):
27 def __init__(self, errorReporter):
28 super(QCalcHistory, self).__init__()
29 self._prettyRenderer = operation.render_number()
30 self._errorReporter = errorReporter
32 self._historyStore = QtGui.QStandardItemModel()
33 self._historyStore.setHorizontalHeaderLabels(["", "Equation", "Result"])
34 self._historyStore.itemChanged.connect(self._on_item_changed)
36 self._historyView = QtGui.QTreeView()
37 self._historyView.setModel(self._historyStore)
38 self._historyView.setUniformRowHeights(True)
39 self._historyView.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
40 self._historyView.setSelectionBehavior(QtGui.QAbstractItemView.SelectRows)
41 self._historyView.setSelectionMode(QtGui.QAbstractItemView.SingleSelection)
42 self._historyView.setHeaderHidden(True)
44 viewHeader = self._historyView.header()
45 viewHeader.setSortIndicatorShown(True)
46 viewHeader.setClickable(True)
48 viewHeader.setResizeMode(self._CLOSE_COLUMN, QtGui.QHeaderView.ResizeToContents)
49 viewHeader.setResizeMode(self._EQ_COLUMN, QtGui.QHeaderView.Stretch)
50 viewHeader.setResizeMode(self._RESULT_COLUMN, QtGui.QHeaderView.ResizeToContents)
51 viewHeader.setStretchLastSection(False)
54 self._programmaticUpdate = False
58 return self._historyView
61 def errorReporter(self):
62 return self._errorReporter
65 simpleNode = node.simplify()
67 icon = QtGui.QStandardItem(QtGui.QIcon.fromTheme("gtk-close"), "")
68 icon.setEditable(False)
69 equation = QtGui.QStandardItem(operation.render_operation(self._prettyRenderer, node))
70 equation.setData(node)
71 result = QtGui.QStandardItem(operation.render_operation(self._prettyRenderer, simpleNode))
72 result.setData(simpleNode)
74 row = (icon, equation, result)
75 self._historyStore.appendRow(row)
77 index = result.index()
78 self._historyView.scrollTo(index)
83 raise IndexError("Not enough items in the history for the operation")
85 icon, equation, result = self._historyStore.takeRow(self._rowCount - 1)
87 return equation.data().toPyObject()
91 raise IndexError("Not enough items in the history for the operation")
93 icon, equation, result = self._historyStore.takeRow(self._rowCount - 1)
94 row = (icon, equation, result)
95 self._historyStore.appendRow(row)
97 return equation.data().toPyObject()
100 self._historyStore.clear()
103 @misc_utils.log_exception(_moduleLogger)
104 def _on_item_changed(self, item):
105 if self._programmaticUpdate:
106 _moduleLogger.info("Blocking updating %r recursively" % item)
108 self._programmaticUpdate = True
110 if item.column() in [self._EQ_COLUMN, self._RESULT_COLUMN]:
111 self._update_input(item)
113 raise NotImplementedError("Unsupported column to edit %s" % item.column())
114 except StandardError, e:
115 self.errorReporter.push_exception()
117 self._programmaticUpdate = False
119 def _parse_value(self, value):
120 raise NotImplementedError("What?")
122 def _update_input(self, item):
123 node = item.data().toPyObject()
125 eqNode = self._parse_value(str(item.text()))
126 newText = operation.render_operation(self._prettyRenderer, eqNode)
128 eqItem = self._historyStore.item(item.row(), self._EQ_COLUMN)
129 eqItem.setData(eqNode)
130 eqItem.setText(newText)
132 resultNode = eqNode.simplify()
133 resultText = operation.render_operation(self._prettyRenderer, resultNode)
134 resultItem = self._historyStore.item(item.row(), self._RESULT_COLUMN)
135 resultItem.setData(resultNode)
136 resultItem.setText(resultText)
138 oldText = operation.render_operation(self._prettyRenderer, node)
139 item.setText(oldText)
143 return self._rowCount
146 for i in xrange(self._rowCount):
147 yield self._historyStore.item(i, 1).data().toPyObject()