Mercurial Repositories > eric / file comparison
comparison: Helpviewer/History/HistoryTreeModel.py
Helpviewer/History/HistoryTreeModel.py
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| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2009 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing the history tree model. | |
| 8 """ | |
| 9 | |
| 10 import bisect | |
| 11 | |
| 12 from PyQt4.QtCore import * | |
| 13 from PyQt4.QtGui import QAbstractProxyModel | |
| 14 | |
| 15 from HistoryModel import HistoryModel | |
| 16 | |
| 17 import UI.PixmapCache | |
| 18 | |
| 19 class HistoryTreeModel(QAbstractProxyModel): | |
| 20 """ | |
| 21 Class implementing the history tree model. | |
| 22 """ | |
| 23 def __init__(self, sourceModel, parent = None): | |
| 24 """ | |
| 25 Constructor | |
| 26 | |
| 27 @param sourceModel reference to the source model (QAbstractItemModel) | |
| 28 @param parent reference to the parent object (QObject) | |
| 29 """ | |
| 30 QAbstractProxyModel.__init__(self, parent) | |
| 31 | |
| 32 self.__sourceRowCache = [] | |
| 33 self.__removingDown = False | |
| 34 | |
| 35 self.setSourceModel(sourceModel) | |
| 36 | |
| 37 def headerData(self, section, orientation, role = Qt.DisplayRole): | |
| 38 """ | |
| 39 Public method to get the header data. | |
| 40 | |
| 41 @param section section number (integer) | |
| 42 @param orientation header orientation (Qt.Orientation) | |
| 43 @param role data role (integer) | |
| 44 @return header data (QVariant) | |
| 45 """ | |
| 46 return self.sourceModel().headerData(section, orientation, role) | |
| 47 | |
| 48 def data(self, index, role = Qt.DisplayRole): | |
| 49 """ | |
| 50 Public method to get data from the model. | |
| 51 | |
| 52 @param index index of history entry to get data for (QModelIndex) | |
| 53 @param role data role (integer) | |
| 54 @return history entry data (QVariant) | |
| 55 """ | |
| 56 if role in [Qt.DisplayRole, Qt.EditRole]: | |
| 57 start = index.internalId() | |
| 58 if start == 0: | |
| 59 offset = self.__sourceDateRow(index.row()) | |
| 60 if index.column() == 0: | |
| 61 idx = self.sourceModel().index(offset, 0) | |
| 62 date = idx.data(HistoryModel.DateRole).toDate() | |
| 63 if date == QDate.currentDate(): | |
| 64 return QVariant(self.trUtf8("Earlier Today")) | |
| 65 return QVariant(date.toString("yyyy-MM-dd")) | |
| 66 if index.column() == 1: | |
| 67 return QVariant(self.trUtf8( | |
| 68 "%n item(s)", "", self.rowCount(index.sibling(index.row(), 0)))) | |
| 69 | |
| 70 elif role == Qt.DecorationRole: | |
| 71 if index.column() == 0 and not index.parent().isValid(): | |
| 72 return QVariant(UI.PixmapCache.getIcon("history.png")) | |
| 73 | |
| 74 elif role == HistoryModel.DateRole: | |
| 75 if index.column() == 0 and index.internalId() == 0: | |
| 76 offset = self.__sourceDateRow(index.row()) | |
| 77 idx = self.sourceModel().index(offset, 0) | |
| 78 return idx.data(HistoryModel.DateRole) | |
| 79 | |
| 80 return QAbstractProxyModel.data(self, index, role) | |
| 81 | |
| 82 def columnCount(self, parent = QModelIndex()): | |
| 83 """ | |
| 84 Public method to get the number of columns. | |
| 85 | |
| 86 @param parent index of parent (QModelIndex) | |
| 87 @return number of columns (integer) | |
| 88 """ | |
| 89 return self.sourceModel().columnCount(self.mapToSource(parent)) | |
| 90 | |
| 91 def rowCount(self, parent = QModelIndex()): | |
| 92 """ | |
| 93 Public method to determine the number of rows. | |
| 94 | |
| 95 @param parent index of parent (QModelIndex) | |
| 96 @return number of rows (integer) | |
| 97 """ | |
| 98 if parent.internalId() != 0 or \ | |
| 99 parent.column() > 0 or \ | |
| 100 self.sourceModel() is None: | |
| 101 return 0 | |
| 102 | |
| 103 # row count OF dates | |
| 104 if not parent.isValid(): | |
| 105 if self.__sourceRowCache: | |
| 106 return len(self.__sourceRowCache) | |
| 107 | |
| 108 currentDate = QDate() | |
| 109 rows = 0 | |
| 110 totalRows = self.sourceModel().rowCount() | |
| 111 | |
| 112 for row in range(totalRows): | |
| 113 rowDate = \ | |
| 114 self.sourceModel().index(row, 0).data(HistoryModel.DateRole).toDate() | |
| 115 if rowDate != currentDate: | |
| 116 self.__sourceRowCache.append(row) | |
| 117 currentDate = rowDate | |
| 118 rows += 1 | |
| 119 return rows | |
| 120 | |
| 121 # row count FOR a date | |
| 122 start = self.__sourceDateRow(parent.row()) | |
| 123 end = self.__sourceDateRow(parent.row() + 1) | |
| 124 return end - start | |
| 125 | |
| 126 def __sourceDateRow(self, row): | |
| 127 """ | |
| 128 Private method to translate the top level date row into the offset | |
| 129 where that date starts. | |
| 130 | |
| 131 @param row row number of the date (integer) | |
| 132 @return offset where that date starts (integer) | |
| 133 """ | |
| 134 if row <= 0: | |
| 135 return 0 | |
| 136 | |
| 137 if len(self.__sourceRowCache) == 0: | |
| 138 self.rowCount(QModelIndex()) | |
| 139 | |
| 140 if row >= len(self.__sourceRowCache): | |
| 141 if self.sourceModel() is None: | |
| 142 return 0 | |
| 143 return self.sourceModel().rowCount() | |
| 144 | |
| 145 return self.__sourceRowCache[row] | |
| 146 | |
| 147 def mapToSource(self, proxyIndex): | |
| 148 """ | |
| 149 Public method to map an index to the source model index. | |
| 150 | |
| 151 @param proxyIndex reference to a proxy model index (QModelIndex) | |
| 152 @return source model index (QModelIndex) | |
| 153 """ | |
| 154 offset = proxyIndex.internalId() | |
| 155 if offset == 0: | |
| 156 return QModelIndex() | |
| 157 startDateRow = self.__sourceDateRow(offset - 1) | |
| 158 return self.sourceModel().index( | |
| 159 startDateRow + proxyIndex.row(), proxyIndex.column()) | |
| 160 | |
| 161 def index(self, row, column, parent = QModelIndex()): | |
| 162 """ | |
| 163 Public method to create an index. | |
| 164 | |
| 165 @param row row number for the index (integer) | |
| 166 @param column column number for the index (integer) | |
| 167 @param parent index of the parent item (QModelIndex) | |
| 168 @return requested index (QModelIndex) | |
| 169 """ | |
| 170 if row < 0 or \ | |
| 171 column < 0 or \ | |
| 172 column >= self.columnCount(parent) or \ | |
| 173 parent.column() > 0: | |
| 174 return QModelIndex() | |
| 175 | |
| 176 if not parent.isValid(): | |
| 177 return self.createIndex(row, column, 0) | |
| 178 return self.createIndex(row, column, parent.row() + 1) | |
| 179 | |
| 180 def parent(self, index): | |
| 181 """ | |
| 182 Public method to get the parent index. | |
| 183 | |
| 184 @param index index of item to get parent (QModelIndex) | |
| 185 @return index of parent (QModelIndex) | |
| 186 """ | |
| 187 offset = index.internalId() | |
| 188 if offset == 0 or not index.isValid(): | |
| 189 return QModelIndex() | |
| 190 return self.createIndex(offset - 1, 0, 0) | |
| 191 | |
| 192 def hasChildren(self, parent = QModelIndex()): | |
| 193 """ | |
| 194 Public method to check, if an entry has some children. | |
| 195 | |
| 196 @param parent index of the entry to check (QModelIndex) | |
| 197 @return flag indicating the presence of children (boolean) | |
| 198 """ | |
| 199 grandparent = parent.parent() | |
| 200 if not grandparent.isValid(): | |
| 201 return True | |
| 202 return False | |
| 203 | |
| 204 def flags(self, index): | |
| 205 """ | |
| 206 Public method to get the item flags. | |
| 207 | |
| 208 @param index index of the item (QModelIndex) | |
| 209 @return flags (Qt.ItemFlags) | |
| 210 """ | |
| 211 if not index.isValid(): | |
| 212 return Qt.ItemFlags(Qt.NoItemFlags) | |
| 213 return Qt.ItemFlags(Qt.ItemIsSelectable | Qt.ItemIsEnabled | Qt.ItemIsDragEnabled) | |
| 214 | |
| 215 def setSourceModel(self, sourceModel): | |
| 216 """ | |
| 217 Public method to set the source model. | |
| 218 | |
| 219 @param sourceModel reference to the source model (QAbstractItemModel) | |
| 220 """ | |
| 221 if self.sourceModel() is not None: | |
| 222 self.disconnect(self.sourceModel(), | |
| 223 SIGNAL("modelReset()"), | |
| 224 self.__sourceReset) | |
| 225 self.disconnect(self.sourceModel(), | |
| 226 SIGNAL("layoutChanged()"), | |
| 227 self.__sourceReset) | |
| 228 self.disconnect(self.sourceModel(), | |
| 229 SIGNAL("rowsInserted(const QModelIndex &, int, int)"), | |
| 230 self.__sourceRowsInserted) | |
| 231 self.disconnect(self.sourceModel(), | |
| 232 SIGNAL("rowsRemoved(const QModelIndex &, int, int)"), | |
| 233 self.__sourceRowsRemoved) | |
| 234 | |
| 235 QAbstractProxyModel.setSourceModel(self, sourceModel) | |
| 236 | |
| 237 if self.sourceModel() is not None: | |
| 238 self.__loaded = False | |
| 239 self.connect(self.sourceModel(), | |
| 240 SIGNAL("modelReset()"), | |
| 241 self.__sourceReset) | |
| 242 self.connect(self.sourceModel(), | |
| 243 SIGNAL("layoutChanged()"), | |
| 244 self.__sourceReset) | |
| 245 self.connect(self.sourceModel(), | |
| 246 SIGNAL("rowsInserted(const QModelIndex &, int, int)"), | |
| 247 self.__sourceRowsInserted) | |
| 248 self.connect(self.sourceModel(), | |
| 249 SIGNAL("rowsRemoved(const QModelIndex &, int, int)"), | |
| 250 self.__sourceRowsRemoved) | |
| 251 | |
| 252 self.reset() | |
| 253 | |
| 254 def __sourceReset(self): | |
| 255 """ | |
| 256 Private slot to handle a reset of the source model. | |
| 257 """ | |
| 258 self.__sourceRowCache = [] | |
| 259 self.reset() | |
| 260 | |
| 261 def __sourceRowsInserted(self, parent, start, end): | |
| 262 """ | |
| 263 Private slot to handle the insertion of data in the source model. | |
| 264 | |
| 265 @param parent reference to the parent index (QModelIndex) | |
| 266 @param start start row (integer) | |
| 267 @param end end row (integer) | |
| 268 """ | |
| 269 if not parent.isValid(): | |
| 270 if start != 0 or start != end: | |
| 271 self.__sourceRowCache = [] | |
| 272 self.reset() | |
| 273 return | |
| 274 | |
| 275 self.__sourceRowCache = [] | |
| 276 treeIndex = self.mapFromSource(self.sourceModel().index(start, 0)) | |
| 277 treeParent = treeIndex.parent() | |
| 278 if self.rowCount(treeParent) == 1: | |
| 279 self.beginInsertRows(QModelIndex(), 0, 0) | |
| 280 self.endInsertRows() | |
| 281 else: | |
| 282 self.beginInsertRows(treeParent, treeIndex.row(), treeIndex.row()) | |
| 283 self.endInsertRows() | |
| 284 | |
| 285 def mapFromSource(self, sourceIndex): | |
| 286 """ | |
| 287 Public method to map an index to the proxy model index. | |
| 288 | |
| 289 @param sourceIndex reference to a source model index (QModelIndex) | |
| 290 @return proxy model index (QModelIndex) | |
| 291 """ | |
| 292 if not sourceIndex.isValid(): | |
| 293 return QModelIndex() | |
| 294 | |
| 295 if len(self.__sourceRowCache) == 0: | |
| 296 self.rowCount(QModelIndex()) | |
| 297 | |
| 298 try: | |
| 299 row = self.__sourceRowCache.index(sourceIndex.row()) | |
| 300 except ValueError: | |
| 301 row = bisect.bisect_left(self.__sourceRowCache, sourceIndex.row()) | |
| 302 if row == len(self.__sourceRowCache) or \ | |
| 303 self.__sourceRowCache[row] != sourceIndex.row(): | |
| 304 row -= 1 | |
| 305 dateRow = max(0, row) | |
| 306 row = sourceIndex.row() - self.__sourceRowCache[dateRow] | |
| 307 return self.createIndex(row, sourceIndex.column(), dateRow + 1) | |
| 308 | |
| 309 def removeRows(self, row, count, parent = QModelIndex()): | |
| 310 """ | |
| 311 Public method to remove entries from the model. | |
| 312 | |
| 313 @param row row of the first entry to remove (integer) | |
| 314 @param count number of entries to remove (integer) | |
| 315 @param index of the parent entry (QModelIndex) | |
| 316 @return flag indicating successful removal (boolean) | |
| 317 """ | |
| 318 if row < 0 or \ | |
| 319 count <= 0 or \ | |
| 320 row + count > self.rowCount(parent): | |
| 321 return False | |
| 322 | |
| 323 self.__removingDown = True | |
| 324 if parent.isValid() and self.rowCount(parent) == count - row: | |
| 325 self.beginRemoveRows(QModelIndex(), parent.row(), parent.row()) | |
| 326 else: | |
| 327 self.beginRemoveRows(parent, row, row + count - 1) | |
| 328 if parent.isValid(): | |
| 329 # removing pages | |
| 330 offset = self.__sourceDateRow(parent.row()) | |
| 331 return self.sourceModel().removeRows(offset + row, count) | |
| 332 else: | |
| 333 # removing whole dates | |
| 334 for i in range(row + count - 1, row - 1, -1): | |
| 335 dateParent = self.index(i, 0) | |
| 336 offset = self.__sourceDateRow(dateParent.row()) | |
| 337 if not self.sourceModel().removeRows(offset, self.rowCount(dateParent)): | |
| 338 return False | |
| 339 return True | |
| 340 | |
| 341 def __sourceRowsRemoved(self, parent, start, end): | |
| 342 """ | |
| 343 Private slot to handle the removal of data in the source model. | |
| 344 | |
| 345 @param parent reference to the parent index (QModelIndex) | |
| 346 @param start start row (integer) | |
| 347 @param end end row (integer) | |
| 348 """ | |
| 349 if not self.__removingDown: | |
| 350 self.__sourceRowCache = [] | |
| 351 self.reset() | |
| 352 return | |
| 353 | |
| 354 if not parent.isValid(): | |
| 355 if self.__sourceRowCache: | |
| 356 i = end | |
| 357 while i >= start: | |
| 358 try: | |
| 359 ind = self.__sourceRowCache.index(i) | |
| 360 except ValueError: | |
| 361 ind = bisect.bisect_left(self.__sourceRowCache, i) | |
| 362 if ind == len(self.__sourceRowCache) or \ | |
| 363 self.__sourceRowCache[ind] != i: | |
| 364 ind -= 1 | |
| 365 row = max(0, ind) | |
| 366 offset = self.__sourceRowCache[row] | |
| 367 dateParent = self.index(row, 0) | |
| 368 # If we can remove all the rows in the date do that | |
| 369 # and skip over them. | |
| 370 rc = self.rowCount(dateParent) | |
| 371 if i - rc + 1 == offset and start <= i - rc + 1: | |
| 372 del self.__sourceRowCache[row] | |
| 373 i -= rc + 1 | |
| 374 else: | |
| 375 row += 1 | |
| 376 i -= 1 | |
| 377 for j in range(row, len(self.__sourceRowCache)): | |
| 378 self.__sourceRowCache[j] -= 1 | |
| 379 | |
| 380 if self.__removingDown: | |
| 381 self.endRemoveRows() | |
| 382 self.__removingDown = False |
