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
14 import util.misc as misc_utils
19 _moduleLogger = logging.getLogger(__name__)
22 class QCalcHistory(history.AbstractHistory):
28 def __init__(self, errorReporter):
29 super(QCalcHistory, self).__init__()
30 self._prettyRenderer = operation.render_number()
31 self._errorReporter = errorReporter
33 self._historyStore = QtGui.QStandardItemModel()
34 self._historyStore.setHorizontalHeaderLabels(["", "Equation", "Result"])
35 self._historyStore.itemChanged.connect(self._on_item_changed)
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)
46 viewHeader = self._historyView.header()
47 viewHeader.setSortIndicatorShown(True)
48 viewHeader.setClickable(True)
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)
56 self._programmaticUpdate = False
57 self._closeIcon = maeqt.get_theme_icon(("window-close", "general_close", "gtk-close"))
61 return self._historyView
64 def errorReporter(self):
65 return self._errorReporter
68 simpleNode = node.simplify()
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)
81 result = QtGui.QStandardItem(operation.render_operation(self._prettyRenderer, simpleNode))
82 result.setData(simpleNode)
83 result.setEditable(False)
84 result.setCheckable(False)
86 row = (icon, equation, result)
87 self._historyStore.appendRow(row)
89 index = result.index()
90 self._historyView.scrollTo(index)
95 raise IndexError("Not enough items in the history for the operation")
97 icon, equation, result = self._historyStore.takeRow(self._rowCount - 1)
99 return equation.data().toPyObject()
103 raise IndexError("Not enough items in the history for the operation")
105 icon, equation, result = self._historyStore.takeRow(self._rowCount - 1)
106 row = (icon, equation, result)
107 self._historyStore.appendRow(row)
109 return equation.data().toPyObject()
112 self._historyStore.clear()
115 @misc_utils.log_exception(_moduleLogger)
116 def _on_row_activated(self, index):
117 if index.column() == self._CLOSE_COLUMN:
118 self._historyStore.removeRow(index.row(), index.parent())
120 elif index.column() == self._EQ_COLUMN:
121 self._duplicate_row(index)
122 elif index.column() == self._RESULT_COLUMN:
123 self._duplicate_row(index)
125 raise NotImplementedError("Unsupported column to activate %s" % index.column())
127 @misc_utils.log_exception(_moduleLogger)
128 def _on_item_changed(self, item):
129 if self._programmaticUpdate:
130 _moduleLogger.info("Blocking updating %r recursively" % item)
132 self._programmaticUpdate = True
134 if item.column() in [self._EQ_COLUMN, self._RESULT_COLUMN]:
135 self._update_input(item)
137 raise NotImplementedError("Unsupported column to edit %s" % item.column())
138 except StandardError, e:
139 self.errorReporter.push_exception()
141 self._programmaticUpdate = False
143 def _duplicate_row(self, index):
144 item = self._historyStore.item(index.row(), self._EQ_COLUMN)
145 self.push(item.data().toPyObject())
147 def _parse_value(self, value):
148 raise NotImplementedError("What?")
150 def _update_input(self, item):
151 node = item.data().toPyObject()
153 eqNode = self._parse_value(str(item.text()))
154 newText = operation.render_operation(self._prettyRenderer, eqNode)
156 eqItem = self._historyStore.item(item.row(), self._EQ_COLUMN)
157 eqItem.setData(eqNode)
158 eqItem.setText(newText)
160 resultNode = eqNode.simplify()
161 resultText = operation.render_operation(self._prettyRenderer, resultNode)
162 resultItem = self._historyStore.item(item.row(), self._RESULT_COLUMN)
163 resultItem.setData(resultNode)
164 resultItem.setText(resultText)
166 oldText = operation.render_operation(self._prettyRenderer, node)
167 item.setText(oldText)
171 return self._rowCount
174 for i in xrange(self._rowCount):
175 item = self._historyStore.item(i, self._EQ_COLUMN)
178 yield item.data().toPyObject()