pyffi.qskope.detail

54 """Defines an editor for data in the detail view.""" 55

56 - def _checkValidEditor(self, data, editor):

57 """This function checks that the delegate class has the correct editor. 58 If data and editor do not correspond to one another, then a ValueError is 59 raised. 60 61 All functions checking for delegate base classes should respect 62 the order in this function, because a class may derive from more than 63 one delegate class. So this function determines which editor is 64 preferred if this happens. The order is: 65 66 - ComboBox 67 - FloatSpinBox 68 - SpinBox 69 - TextEdit 70 - LineEdit 71 72 This function is only used for internal debugging purposes. 73 """ 74 # the general idea is to check complex instances (that derive from 75 # simpler ones) first 76 77 # check combo box 78 # (some combo types may also derive from spin box such as bools, 79 # in that case prefer the combo box representation) 80 if isinstance(data, EditableComboBox): 81 isvalid = isinstance(editor, QtGui.QComboBox) 82 # check float spin box 83 elif isinstance(data, EditableFloatSpinBox): 84 isvalid = isinstance(editor, QtGui.QDoubleSpinBox) 85 # check spin box 86 elif isinstance(data, EditableSpinBox): 87 isvalid = isinstance(editor, QtGui.QSpinBox) 88 # check text editor 89 elif isinstance(data, EditableTextEdit): 90 isvalid = isinstance(editor, QtGui.QTextEdit) 91 # check line editor 92 elif isinstance(data, EditableLineEdit): 93 isvalid = isinstance(editor, QtGui.QLineEdit) 94 else: 95 # data has no delegate class, which is classified as invalid 96 isvalid = False 97 98 # if invalid, raise ValueError 99 if not isvalid: 100 raise ValueError("data %s has bad editor %s" 101 % (data.__class__.__name__, 102 editor.__class__.__name__))

103

104 - def createEditor(self, parent, option, index):

105 """Returns the widget used to change data.""" 106 # check if index is valid 107 if not index.isValid(): 108 return None 109 # get the data 110 node = index.internalPointer().data.node 111 # determine editor by checking for delegate base classes 112 # (see _checkValidEditor for the correct delegate preference order) 113 if isinstance(node, EditableComboBox): 114 # a general purpose combo box 115 editor = QtGui.QComboBox(parent) 116 for key in node.get_editor_keys(): 117 editor.addItem(key) 118 elif isinstance(node, EditableFloatSpinBox): 119 # a spinbox for floats 120 editor = QtGui.QDoubleSpinBox(parent) 121 editor.setMinimum(node.get_editor_minimum()) 122 editor.setMaximum(node.get_editor_maximum()) 123 editor.setDecimals(node.get_editor_decimals()) 124 elif isinstance(node, EditableSpinBox): 125 # an integer spin box 126 editor = QtGui.QSpinBox(parent) 127 editor.setMinimum(node.get_editor_minimum()) 128 # work around a qt "bug": maximum must be C type "int" 129 # so cannot be larger than 0x7fffffff 130 editor.setMaximum(min(node.get_editor_maximum(), 0x7fffffff)) 131 elif isinstance(node, EditableTextEdit): 132 # a text editor 133 editor = QtGui.QTextEdit(parent) 134 elif isinstance(node, EditableLineEdit): 135 # a line editor 136 editor = QtGui.QLineEdit(parent) 137 else: 138 return None 139 # check validity 140 self._checkValidEditor(node, editor) 141 # return the editor 142 return editor

143

144 - def setEditorData(self, editor, index):

145 """Provides the widget with data to manipulate.""" 146 # check if index is valid 147 if not index.isValid(): 148 return None 149 # determine the data and its value 150 node = index.internalPointer().data.node 151 editorvalue = node.get_editor_value() 152 # check validity of editor 153 self._checkValidEditor(node, editor) 154 # set editor node 155 # (see _checkValidEditor for the correct delegate preference order) 156 if isinstance(node, EditableComboBox): 157 # a combo box: set the index 158 editor.setCurrentIndex(editorvalue) 159 elif isinstance(node, EditableSpinBox): 160 # a (possibly float) spinbox: simply set the value 161 editor.setValue(editorvalue) 162 elif isinstance(node, EditableLineEdit): 163 # a text editor: set the text 164 editor.setText(editorvalue)

165

166 - def updateEditorGeometry(self, editor, option, index):

167 """Ensures that the editor is displayed correctly with respect to the 168 item view.""" 169 editor.setGeometry(option.rect)

170

171 - def setModelData(self, editor, model, index):

172 """Returns updated data to the model.""" 173 # check if index is valid 174 if not index.isValid(): 175 return None 176 # get the data 177 node = index.internalPointer().data.node 178 # check validity of editor 179 self._checkValidEditor(node, editor) 180 # set model data from editor value 181 # (see _checkValidEditor for the correct delegate preference order) 182 if isinstance(node, EditableComboBox): 183 # a combo box: get the value from the current index 184 editorvalue = editor.currentIndex() 185 elif isinstance(node, EditableSpinBox): 186 # a regular (float) spin box 187 editorvalue = editor.value() 188 elif isinstance(node, EditableLineEdit): 189 # a text editor 190 editorvalue = editor.text() 191 else: 192 # should not happen: no editor 193 print("WARNING: cannot set model data for type %s" 194 % node.__class__.__name__) 195 return 196 # set the model data 197 # EditRole ensures that setData uses set_editor_value to set the data 198 model.setData(index, QtCore.QVariant(editorvalue), QtCore.Qt.EditRole)

Source Code for Module pyffi.qskope.detail_delegate