Mercurial Repositories > eric / file comparison
comparison: E4Gui/E4ModelMenu.py
E4Gui/E4ModelMenu.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 a menu populated from a QAbstractItemModel. | |
| 8 """ | |
| 9 | |
| 10 from PyQt4.QtCore import * | |
| 11 from PyQt4.QtGui import * | |
| 12 | |
| 13 import UI.PixmapCache | |
| 14 | |
| 15 class E4ModelMenu(QMenu): | |
| 16 """ | |
| 17 Class implementing a menu populated from a QAbstractItemModel. | |
| 18 | |
| 19 @signal activated(const QModelIndex&) emitted when an action has been triggered | |
| 20 """ | |
| 21 def __init__(self, parent = None): | |
| 22 """ | |
| 23 Constructor | |
| 24 | |
| 25 @param parent reference to the parent widget (QWidget) | |
| 26 """ | |
| 27 QMenu.__init__(self, parent) | |
| 28 | |
| 29 self.__maxRows = -1 | |
| 30 self.__firstSeparator = -1 | |
| 31 self.__maxWidth = -1 | |
| 32 self.__statusBarTextRole = 0 | |
| 33 self.__separatorRole = 0 | |
| 34 self.__model = None | |
| 35 self.__root = QModelIndex() | |
| 36 self.__dragStartPosition = QPoint() | |
| 37 | |
| 38 self.setAcceptDrops(True) | |
| 39 | |
| 40 self._mouseButton = Qt.NoButton | |
| 41 self._keyboardModifiers = Qt.KeyboardModifiers(Qt.NoModifier) | |
| 42 self.__dropRow = -1 | |
| 43 self.__dropIndex = None | |
| 44 | |
| 45 self.connect(self, SIGNAL("aboutToShow()"), self.__aboutToShow) | |
| 46 self.connect(self, SIGNAL("triggered(QAction*)"), self.__actionTriggered) | |
| 47 | |
| 48 def prePopulated(self): | |
| 49 """ | |
| 50 Public method to add any actions before the tree. | |
| 51 | |
| 52 @return flag indicating if any actions were added | |
| 53 """ | |
| 54 return False | |
| 55 | |
| 56 def postPopulated(self): | |
| 57 """ | |
| 58 Public method to add any actions after the tree. | |
| 59 """ | |
| 60 pass | |
| 61 | |
| 62 def setModel(self, model): | |
| 63 """ | |
| 64 Public method to set the model for the menu. | |
| 65 | |
| 66 @param model reference to the model (QAbstractItemModel) | |
| 67 """ | |
| 68 self.__model = model | |
| 69 | |
| 70 def model(self): | |
| 71 """ | |
| 72 Public method to get a reference to the model. | |
| 73 | |
| 74 @return reference to the model (QAbstractItemModel) | |
| 75 """ | |
| 76 return self.__model | |
| 77 | |
| 78 def setMaxRows(self, rows): | |
| 79 """ | |
| 80 Public method to set the maximum number of entries to show. | |
| 81 | |
| 82 @param rows maximum number of entries to show (integer) | |
| 83 """ | |
| 84 self.__maxRows = rows | |
| 85 | |
| 86 def maxRows(self): | |
| 87 """ | |
| 88 Public method to get the maximum number of entries to show. | |
| 89 | |
| 90 @return maximum number of entries to show (integer) | |
| 91 """ | |
| 92 return self.__maxRows | |
| 93 | |
| 94 def setFirstSeparator(self, offset): | |
| 95 """ | |
| 96 Public method to set the first separator. | |
| 97 | |
| 98 @param offset row number of the first separator (integer) | |
| 99 """ | |
| 100 self.__firstSeparator = offset | |
| 101 | |
| 102 def firstSeparator(self): | |
| 103 """ | |
| 104 Public method to get the first separator. | |
| 105 | |
| 106 @return row number of the first separator (integer) | |
| 107 """ | |
| 108 return self.__firstSeparator | |
| 109 | |
| 110 def setRootIndex(self, index): | |
| 111 """ | |
| 112 Public method to set the index of the root item. | |
| 113 | |
| 114 @param index index of the root item (QModelIndex) | |
| 115 """ | |
| 116 self.__root = index | |
| 117 | |
| 118 def rootIndex(self): | |
| 119 """ | |
| 120 Public method to get the index of the root item. | |
| 121 | |
| 122 @return index of the root item (QModelIndex) | |
| 123 """ | |
| 124 return self.__root | |
| 125 | |
| 126 def setStatusBarTextRole(self, role): | |
| 127 """ | |
| 128 Public method to set the role of the status bar text. | |
| 129 | |
| 130 @param role role of the status bar text (integer) | |
| 131 """ | |
| 132 self.__statusBarTextRole = role | |
| 133 | |
| 134 def statusBarTextRole(self): | |
| 135 """ | |
| 136 Public method to get the role of the status bar text. | |
| 137 | |
| 138 @return role of the status bar text (integer) | |
| 139 """ | |
| 140 return self.__statusBarTextRole | |
| 141 | |
| 142 def setSeparatorRole(self, role): | |
| 143 """ | |
| 144 Public method to set the role of the separator. | |
| 145 | |
| 146 @param role role of the separator (integer) | |
| 147 """ | |
| 148 self.__separatorRole = role | |
| 149 | |
| 150 def separatorRole(self): | |
| 151 """ | |
| 152 Public method to get the role of the separator. | |
| 153 | |
| 154 @return role of the separator (integer) | |
| 155 """ | |
| 156 return self.__separatorRole | |
| 157 | |
| 158 def __aboutToShow(self): | |
| 159 """ | |
| 160 Private slot to show the menu. | |
| 161 """ | |
| 162 self.clear() | |
| 163 | |
| 164 if self.prePopulated(): | |
| 165 self.addSeparator() | |
| 166 max_ = self.__maxRows | |
| 167 if max_ != -1: | |
| 168 max_ += self.__firstSeparator | |
| 169 self.createMenu(self.__root, max_, self, self) | |
| 170 self.postPopulated() | |
| 171 | |
| 172 def createBaseMenu(self): | |
| 173 """ | |
| 174 Public method to get the menu that is used to populate sub menu's. | |
| 175 | |
| 176 @return reference to the menu (E4ModelMenu) | |
| 177 """ | |
| 178 return E4ModelMenu(self) | |
| 179 | |
| 180 def createMenu(self, parent, max_, parentMenu = None, menu = None): | |
| 181 """ | |
| 182 Public method to put all the children of a parent into a menu of a given length. | |
| 183 | |
| 184 @param parent index of the parent item (QModelIndex) | |
| 185 @param max_ maximum number of entries (integer) | |
| 186 @param parentMenu reference to the parent menu (QMenu) | |
| 187 @param menu reference to the menu to be populated (QMenu) | |
| 188 """ | |
| 189 if menu is None: | |
| 190 v = QVariant(parent) | |
| 191 | |
| 192 title = parent.data().toString() | |
| 193 modelMenu = self.createBaseMenu() | |
| 194 # triggered goes all the way up the menu structure | |
| 195 self.disconnect(modelMenu, SIGNAL("triggered(QAction*)"), | |
| 196 modelMenu.__actionTriggered) | |
| 197 modelMenu.setTitle(title) | |
| 198 | |
| 199 icon = parent.data(Qt.DecorationRole).toPyObject() | |
| 200 if icon == NotImplemented or icon is None: | |
| 201 icon = UI.PixmapCache.getIcon("defaultIcon.png") | |
| 202 modelMenu.setIcon(icon) | |
| 203 if parentMenu is not None: | |
| 204 parentMenu.addMenu(modelMenu).setData(v) | |
| 205 modelMenu.setRootIndex(parent) | |
| 206 modelMenu.setModel(self.__model) | |
| 207 return | |
| 208 | |
| 209 if self.__model is None: | |
| 210 return | |
| 211 | |
| 212 end = self.__model.rowCount(parent) | |
| 213 if max_ != -1: | |
| 214 end = min(max_, end) | |
| 215 | |
| 216 for i in range(end): | |
| 217 idx = self.__model.index(i, 0, parent) | |
| 218 if self.__model.hasChildren(idx): | |
| 219 self.createMenu(idx, -1, menu) | |
| 220 else: | |
| 221 if self.__separatorRole != 0 and idx.data(self.__separatorRole).toBool(): | |
| 222 self.addSeparator() | |
| 223 else: | |
| 224 menu.addAction(self.__makeAction(idx)) | |
| 225 | |
| 226 if menu == self and i == self.__firstSeparator - 1: | |
| 227 self.addSeparator() | |
| 228 | |
| 229 def __makeAction(self, idx): | |
| 230 """ | |
| 231 Private method to create an action. | |
| 232 | |
| 233 @param idx index of the item to create an action for (QModelIndex) | |
| 234 @return reference to the created action (QAction) | |
| 235 """ | |
| 236 icon = idx.data(Qt.DecorationRole).toPyObject() | |
| 237 if icon == NotImplemented or icon is None: | |
| 238 icon = UI.PixmapCache.getIcon("defaultIcon.png") | |
| 239 action = self.makeAction(icon, idx.data().toString(), self) | |
| 240 action.setStatusTip(idx.data(self.__statusBarTextRole).toString()) | |
| 241 | |
| 242 v = QVariant(idx) | |
| 243 action.setData(v) | |
| 244 | |
| 245 return action | |
| 246 | |
| 247 def makeAction(self, icon, text, parent): | |
| 248 """ | |
| 249 Public method to create an action. | |
| 250 | |
| 251 @param icon icon of the action (QIcon) | |
| 252 @param text text of the action (string) | |
| 253 @param reference to the parent object (QObject) | |
| 254 @return reference to the created action (QAction) | |
| 255 """ | |
| 256 fm = QFontMetrics(self.font()) | |
| 257 if self.__maxWidth == -1: | |
| 258 self.__maxWidth = fm.width('m') * 30 | |
| 259 smallText = fm.elidedText(text, Qt.ElideMiddle, self.__maxWidth) | |
| 260 | |
| 261 return QAction(icon, smallText, parent) | |
| 262 | |
| 263 def __actionTriggered(self, action): | |
| 264 """ | |
| 265 Private slot to handle the triggering of an action. | |
| 266 | |
| 267 @param action reference to the action that was triggered (QAction) | |
| 268 """ | |
| 269 idx = self.index(action) | |
| 270 if idx.isValid(): | |
| 271 self.emit(SIGNAL("activated(const QModelIndex&)"), idx) | |
| 272 | |
| 273 def index(self, action): | |
| 274 """ | |
| 275 Public method to get the index of an action. | |
| 276 | |
| 277 @param action reference to the action to get the index for (QAction) | |
| 278 @return index of the action (QModelIndex) | |
| 279 """ | |
| 280 if action is None: | |
| 281 return QModelIndex() | |
| 282 | |
| 283 v = action.data() | |
| 284 if not v.isValid(): | |
| 285 return QModelIndex() | |
| 286 | |
| 287 idx = v.toPyObject() | |
| 288 if not isinstance(idx, QModelIndex): | |
| 289 return QModelIndex() | |
| 290 | |
| 291 return idx | |
| 292 | |
| 293 def dragEnterEvent(self, evt): | |
| 294 """ | |
| 295 Protected method to handle drag enter events. | |
| 296 | |
| 297 @param evt reference to the event (QDragEnterEvent) | |
| 298 """ | |
| 299 if self.__model is not None: | |
| 300 mimeTypes = self.__model.mimeTypes() | |
| 301 for mimeType in mimeTypes: | |
| 302 if evt.mimeData().hasFormat(mimeType): | |
| 303 evt.acceptProposedAction() | |
| 304 | |
| 305 QMenu.dragEnterEvent(self, evt) | |
| 306 | |
| 307 def dropEvent(self, evt): | |
| 308 """ | |
| 309 Protected method to handle drop events. | |
| 310 | |
| 311 @param evt reference to the event (QDropEvent) | |
| 312 """ | |
| 313 if self.__model is not None: | |
| 314 act = self.actionAt(evt.pos()) | |
| 315 parentIndex = self.__root | |
| 316 if act is None: | |
| 317 row = self.__model.rowCount(self.__root) | |
| 318 else: | |
| 319 idx = self.index(act) | |
| 320 assert idx.isValid() | |
| 321 row = idx.row() | |
| 322 if self.__model.hasChildren(idx): | |
| 323 parentIndex = idx | |
| 324 row = self.__model.rowCount(idx) | |
| 325 | |
| 326 self.__dropRow = row | |
| 327 self.__dropIndex = parentIndex | |
| 328 evt.acceptProposedAction() | |
| 329 self.__model.dropMimeData(evt.mimeData(), evt.dropAction(), | |
| 330 row, 0, parentIndex) | |
| 331 | |
| 332 QMenu.dropEvent(self, evt) | |
| 333 | |
| 334 def mousePressEvent(self, evt): | |
| 335 """ | |
| 336 Protected method handling mouse press events. | |
| 337 | |
| 338 @param evt reference to the event object (QMouseEvent) | |
| 339 """ | |
| 340 if evt.button() == Qt.LeftButton: | |
| 341 self.__dragStartPosition = evt.pos() | |
| 342 QMenu.mousePressEvent(self, evt) | |
| 343 | |
| 344 def mouseMoveEvent(self, evt): | |
| 345 """ | |
| 346 Protected method to handle mouse move events. | |
| 347 | |
| 348 @param evt reference to the event (QMouseEvent) | |
| 349 """ | |
| 350 if self.__model is None: | |
| 351 QMenu.mouseMoveEvent(self, evt) | |
| 352 return | |
| 353 | |
| 354 if not (evt.buttons() & Qt.LeftButton): | |
| 355 QMenu.mouseMoveEvent(self, evt) | |
| 356 return | |
| 357 | |
| 358 manhattanLength = (evt.pos() - self.__dragStartPosition).manhattanLength() | |
| 359 if manhattanLength <= QApplication.startDragDistance(): | |
| 360 QMenu.mouseMoveEvent(self, evt) | |
| 361 return | |
| 362 | |
| 363 act = self.actionAt(self.__dragStartPosition) | |
| 364 if act is None: | |
| 365 QMenu.mouseMoveEvent(self, evt) | |
| 366 return | |
| 367 | |
| 368 idx = self.index(act) | |
| 369 if not idx.isValid(): | |
| 370 QMenu.mouseMoveEvent(self, evt) | |
| 371 return | |
| 372 | |
| 373 drag = QDrag(self) | |
| 374 drag.setMimeData(self.__model.mimeData([idx])) | |
| 375 actionRect = self.actionGeometry(act) | |
| 376 drag.setPixmap(QPixmap.grabWidget(self, actionRect)) | |
| 377 | |
| 378 if drag.exec_() == Qt.MoveAction: | |
| 379 row = idx.row() | |
| 380 if self.__dropIndex == idx.parent() and self.__dropRow <= row: | |
| 381 row += 1 | |
| 382 self.__model.removeRow(row, self.__root) | |
| 383 | |
| 384 if not self.isAncestorOf(drag.target()): | |
| 385 self.close() | |
| 386 else: | |
| 387 self.emit(SIGNAL("aboutToShow()")) | |
| 388 | |
| 389 def mouseReleaseEvent(self, evt): | |
| 390 """ | |
| 391 Protected method handling mouse release events. | |
| 392 | |
| 393 @param evt reference to the event object (QMouseEvent) | |
| 394 """ | |
| 395 self._mouseButton = evt.button() | |
| 396 self._keyboardModifiers = evt.modifiers() | |
| 397 QMenu.mouseReleaseEvent(self, evt) | |
| 398 | |
| 399 def resetFlags(self): | |
| 400 """ | |
| 401 Public method to reset the saved internal state. | |
| 402 """ | |
| 403 self._mouseButton = Qt.NoButton | |
| 404 self._keyboardModifiers = Qt.KeyboardModifiers(Qt.NoModifier) | |
| 405 | |
| 406 def removeEntry(self, idx): | |
| 407 """ | |
| 408 Public method to remove a menu entry. | |
| 409 | |
| 410 @param idx index of the entry to be removed (QModelIndex) | |
| 411 """ | |
| 412 row = idx.row() | |
| 413 self.__model.removeRow(row, self.__root) | |
| 414 self.emit(SIGNAL("aboutToShow()")) |
