Mercurial Repositories > eric / file comparison
comparison: E4Gui/E4ModelToolBar.py
E4Gui/E4ModelToolBar.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 tool bar populated from a QAbstractItemModel. | |
| 8 """ | |
| 9 | |
| 10 from PyQt4.QtCore import * | |
| 11 from PyQt4.QtGui import * | |
| 12 | |
| 13 from E4ModelMenu import E4ModelMenu | |
| 14 | |
| 15 class E4ModelToolBar(QToolBar): | |
| 16 """ | |
| 17 Class implementing a tool bar populated from a QAbstractItemModel. | |
| 18 """ | |
| 19 def __init__(self, title = None, parent = None): | |
| 20 """ | |
| 21 Constructor | |
| 22 | |
| 23 @param title title for the tool bar (string) | |
| 24 @param parent reference to the parent widget (QWidget) | |
| 25 """ | |
| 26 if title is not None: | |
| 27 QToolBar.__init__(self, title, parent) | |
| 28 else: | |
| 29 QToolBar.__init__(self, parent) | |
| 30 | |
| 31 self.__model = None | |
| 32 | |
| 33 self.__root = QModelIndex() | |
| 34 self.__dragStartPosition = QPoint() | |
| 35 | |
| 36 if self.isVisible(): | |
| 37 self._build() | |
| 38 | |
| 39 self.setAcceptDrops(True) | |
| 40 | |
| 41 self._mouseButton = Qt.NoButton | |
| 42 self._keyboardModifiers = Qt.KeyboardModifiers(Qt.NoModifier) | |
| 43 self.__dropRow = -1 | |
| 44 self.__dropIndex = None | |
| 45 | |
| 46 def setModel(self, model): | |
| 47 """ | |
| 48 Public method to set the model for the tool bar. | |
| 49 | |
| 50 @param model reference to the model (QAbstractItemModel) | |
| 51 """ | |
| 52 if self.__model is not None: | |
| 53 self.disconnect(self.__model, | |
| 54 SIGNAL("modelReset()"), | |
| 55 self._build) | |
| 56 self.disconnect(self.__model, | |
| 57 SIGNAL("rowsInserted(const QModelIndex&, int, int)"), | |
| 58 self._build) | |
| 59 self.disconnect(self.__model, | |
| 60 SIGNAL("rowsRemoved(const QModelIndex&, int, int)"), | |
| 61 self._build) | |
| 62 self.disconnect(self.__model, | |
| 63 SIGNAL("dataChanged(const QModelIndex&, const QModelIndex&)"), | |
| 64 self._build) | |
| 65 | |
| 66 self.__model = model | |
| 67 | |
| 68 if self.__model is not None: | |
| 69 self.connect(self.__model, | |
| 70 SIGNAL("modelReset()"), | |
| 71 self._build) | |
| 72 self.connect(self.__model, | |
| 73 SIGNAL("rowsInserted(const QModelIndex&, int, int)"), | |
| 74 self._build) | |
| 75 self.connect(self.__model, | |
| 76 SIGNAL("rowsRemoved(const QModelIndex&, int, int)"), | |
| 77 self._build) | |
| 78 self.connect(self.__model, | |
| 79 SIGNAL("dataChanged(const QModelIndex&, const QModelIndex&)"), | |
| 80 self._build) | |
| 81 | |
| 82 def model(self): | |
| 83 """ | |
| 84 Public method to get a reference to the model. | |
| 85 | |
| 86 @return reference to the model (QAbstractItemModel) | |
| 87 """ | |
| 88 return self.__model | |
| 89 | |
| 90 def setRootIndex(self, idx): | |
| 91 """ | |
| 92 Public method to set the root index. | |
| 93 | |
| 94 @param idx index to be set as the root index (QModelIndex) | |
| 95 """ | |
| 96 self.__root = idx | |
| 97 | |
| 98 def rootIndex(self): | |
| 99 """ | |
| 100 Public method to get the root index. | |
| 101 | |
| 102 @return root index (QModelIndex) | |
| 103 """ | |
| 104 return self.__root | |
| 105 | |
| 106 def _build(self): | |
| 107 """ | |
| 108 Protected slot to build the tool bar. | |
| 109 """ | |
| 110 assert self.__model is not None | |
| 111 | |
| 112 self.clear() | |
| 113 | |
| 114 for i in range(self.__model.rowCount(self.__root)): | |
| 115 idx = self.__model.index(i, 0, self.__root) | |
| 116 v = QVariant(idx) | |
| 117 | |
| 118 title = idx.data(Qt.DisplayRole).toString() | |
| 119 icon = idx.data(Qt.DecorationRole).toPyObject() | |
| 120 if icon == NotImplemented or icon is None: | |
| 121 icon = QIcon() | |
| 122 folder = self.__model.hasChildren(idx) | |
| 123 | |
| 124 act = self.addAction(icon, title) | |
| 125 act.setData(v) | |
| 126 | |
| 127 button = self.widgetForAction(act) | |
| 128 button.installEventFilter(self) | |
| 129 | |
| 130 if folder: | |
| 131 menu = self._createMenu() | |
| 132 menu.setModel(self.__model) | |
| 133 menu.setRootIndex(idx) | |
| 134 act.setMenu(menu) | |
| 135 button.setPopupMode(QToolButton.InstantPopup) | |
| 136 button.setToolButtonStyle(Qt.ToolButtonTextBesideIcon) | |
| 137 | |
| 138 def index(self, action): | |
| 139 """ | |
| 140 Public method to get the index of an action. | |
| 141 | |
| 142 @param action reference to the action to get the index for (QAction) | |
| 143 @return index of the action (QModelIndex) | |
| 144 """ | |
| 145 if action is None: | |
| 146 return QModelIndex() | |
| 147 | |
| 148 v = action.data() | |
| 149 if not v.isValid(): | |
| 150 return QModelIndex() | |
| 151 | |
| 152 idx = v.toPyObject() | |
| 153 if not isinstance(idx, QModelIndex): | |
| 154 return QModelIndex() | |
| 155 | |
| 156 return idx | |
| 157 | |
| 158 def _createMenu(self): | |
| 159 """ | |
| 160 Protected method to create the menu for a tool bar action. | |
| 161 | |
| 162 @return menu for a tool bar action (E4ModelMenu) | |
| 163 """ | |
| 164 return E4ModelMenu(self) | |
| 165 | |
| 166 def eventFilter(self, obj, evt): | |
| 167 """ | |
| 168 Public method to handle event for other objects. | |
| 169 | |
| 170 @param obj reference to the object (QObject) | |
| 171 @param evt reference to the event (QEvent) | |
| 172 @return flag indicating that the event should be filtered out (boolean) | |
| 173 """ | |
| 174 if evt.type() == QEvent.MouseButtonRelease: | |
| 175 self._mouseButton = evt.button() | |
| 176 self._keyboardModifiers = evt.modifiers() | |
| 177 act = obj.defaultAction() | |
| 178 idx = self.index(act) | |
| 179 if idx.isValid(): | |
| 180 self.emit(SIGNAL("activated(const QModelIndex&)"), idx) | |
| 181 elif evt.type() == QEvent.MouseButtonPress: | |
| 182 if evt.buttons() & Qt.LeftButton: | |
| 183 self.__dragStartPosition = self.mapFromGlobal(evt.globalPos()) | |
| 184 | |
| 185 return False | |
| 186 | |
| 187 def dragEnterEvent(self, evt): | |
| 188 """ | |
| 189 Protected method to handle drag enter events. | |
| 190 | |
| 191 @param evt reference to the event (QDragEnterEvent) | |
| 192 """ | |
| 193 if self.__model is not None: | |
| 194 mimeTypes = self.__model.mimeTypes() | |
| 195 for mimeType in mimeTypes: | |
| 196 if evt.mimeData().hasFormat(mimeType): | |
| 197 evt.acceptProposedAction() | |
| 198 | |
| 199 QToolBar.dragEnterEvent(self, evt) | |
| 200 | |
| 201 def dropEvent(self, evt): | |
| 202 """ | |
| 203 Protected method to handle drop events. | |
| 204 | |
| 205 @param evt reference to the event (QDropEvent) | |
| 206 """ | |
| 207 if self.__model is not None: | |
| 208 act = self.actionAt(evt.pos()) | |
| 209 parentIndex = self.__root | |
| 210 if act is None: | |
| 211 row = self.__model.rowCount(self.__root) | |
| 212 else: | |
| 213 idx = self.index(act) | |
| 214 assert idx.isValid() | |
| 215 row = idx.row() | |
| 216 if self.__model.hasChildren(idx): | |
| 217 parentIndex = idx | |
| 218 row = self.__model.rowCount(idx) | |
| 219 | |
| 220 self.__dropRow = row | |
| 221 self.__dropIndex = parentIndex | |
| 222 evt.acceptProposedAction() | |
| 223 self.__model.dropMimeData(evt.mimeData(), evt.dropAction(), | |
| 224 row, 0, parentIndex) | |
| 225 | |
| 226 QToolBar.dropEvent(self, evt) | |
| 227 | |
| 228 def mouseMoveEvent(self, evt): | |
| 229 """ | |
| 230 Protected method to handle mouse move events. | |
| 231 | |
| 232 @param evt reference to the event (QMouseEvent) | |
| 233 """ | |
| 234 if self.__model is None: | |
| 235 QToolBar.mouseMoveEvent(self, evt) | |
| 236 return | |
| 237 | |
| 238 if not (evt.buttons() & Qt.LeftButton): | |
| 239 QToolBar.mouseMoveEvent(self, evt) | |
| 240 return | |
| 241 | |
| 242 manhattanLength = (evt.pos() - self.__dragStartPosition).manhattanLength() | |
| 243 if manhattanLength <= QApplication.startDragDistance(): | |
| 244 QToolBar.mouseMoveEvent(self, evt) | |
| 245 return | |
| 246 | |
| 247 act = self.actionAt(self.__dragStartPosition) | |
| 248 if act is None: | |
| 249 QToolBar.mouseMoveEvent(self, evt) | |
| 250 return | |
| 251 | |
| 252 idx = self.index(act) | |
| 253 assert idx.isValid() | |
| 254 | |
| 255 drag = QDrag(self) | |
| 256 drag.setMimeData(self.__model.mimeData([idx])) | |
| 257 actionRect = self.actionGeometry(act) | |
| 258 drag.setPixmap(QPixmap.grabWidget(self, actionRect)) | |
| 259 | |
| 260 if drag.exec_() == Qt.MoveAction: | |
| 261 row = idx.row() | |
| 262 if self.__dropIndex == idx.parent() and self.__dropRow <= row: | |
| 263 row += 1 | |
| 264 self.__model.removeRow(row, self.__root) | |
| 265 | |
| 266 def hideEvent(self, evt): | |
| 267 """ | |
| 268 Protected method to handle hide events. | |
| 269 | |
| 270 @param evt reference to the hide event (QHideEvent) | |
| 271 """ | |
| 272 self.clear() | |
| 273 QToolBar.hideEvent(self, evt) | |
| 274 | |
| 275 def showEvent(self, evt): | |
| 276 """ | |
| 277 Protected method to handle show events. | |
| 278 | |
| 279 @param evt reference to the hide event (QHideEvent) | |
| 280 """ | |
| 281 if len(self.actions()) == 0: | |
| 282 self._build() | |
| 283 QToolBar.showEvent(self, evt) | |
| 284 | |
| 285 def resetFlags(self): | |
| 286 """ | |
| 287 Public method to reset the saved internal state. | |
| 288 """ | |
| 289 self._mouseButton = Qt.NoButton | |
| 290 self._keyboardModifiers = Qt.KeyboardModifiers(Qt.NoModifier) |
