Graphics/UMLItem.py

Tue, 11 Sep 2012 18:46:46 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Tue, 11 Sep 2012 18:46:46 +0200
changeset 2038
72557ef75de1
parent 2034
8de0fc1f7fef
child 2039
fa41ccd7f7bc
permissions
-rw-r--r--

Added ability to move graphics items in the diagram via the cursor keys and to limit the item position to the scene.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2004 - 2012 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing the UMLItem base class.
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8 """
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9
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10 from PyQt4.QtCore import Qt, QSizeF
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11 from PyQt4.QtGui import QGraphicsItem, QGraphicsRectItem, QStyle
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12
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13 import Preferences
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14
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15
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16 class UMLItem(QGraphicsRectItem):
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17 """
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18 Class implementing the UMLItem base class.
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19 """
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20 ItemType = "UMLItem"
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21
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22 def __init__(self, x=0, y=0, rounded=False, parent=None):
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23 """
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24 Constructor
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25
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26 @param x x-coordinate (integer)
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27 @param y y-coordinate (integer)
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28 @param rounded flag indicating a rounded corner (boolean)
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29 @keyparam parent reference to the parent object (QGraphicsItem)
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30 """
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31 super().__init__(parent)
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32 self.font = Preferences.getGraphics("Font")
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33 self.margin = 5
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34 self.associations = []
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35 self.shouldAdjustAssociations = False
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36 self.__id = -1
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37
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38 self.setRect(x, y, 60, 30)
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39
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40 if rounded:
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41 p = self.pen()
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42 p.setCapStyle(Qt.RoundCap)
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43 p.setJoinStyle(Qt.RoundJoin)
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44
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45 self.setFlag(QGraphicsItem.ItemIsMovable, True)
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46 self.setFlag(QGraphicsItem.ItemIsSelectable, True)
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47 try:
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48 self.setFlag(QGraphicsItem.ItemSendsGeometryChanges, True)
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49 except AttributeError:
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50 # only available for Qt 4.6.0 and newer
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51 pass
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52
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53 def setSize(self, width, height):
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54 """
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55 Public method to set the rectangles size.
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56
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57 @param width width of the rectangle (float)
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58 @param height height of the rectangle (float)
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59 """
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60 rect = self.rect()
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61 rect.setSize(QSizeF(width, height))
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62 self.setRect(rect)
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63
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64 def addAssociation(self, assoc):
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65 """
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66 Method to add an association to this widget.
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67
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68 @param assoc association to be added (AssociationWidget)
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69 """
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70 if assoc and not assoc in self.associations:
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71 self.associations.append(assoc)
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72
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73 def removeAssociation(self, assoc):
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74 """
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75 Method to remove an association to this widget.
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76
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77 @param assoc association to be removed (AssociationWidget)
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78 """
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79 if assoc and assoc in self.associations:
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80 self.associations.remove(assoc)
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81
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82 def removeAssociations(self):
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83 """
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84 Method to remove all associations of this widget.
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85 """
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86 for assoc in self.associations[:]:
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87 assoc.unassociate()
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88 assoc.hide()
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89 del assoc
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90
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91 def adjustAssociations(self):
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92 """
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93 Method to adjust the associations to widget movements.
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94 """
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95 if self.shouldAdjustAssociations:
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96 for assoc in self.associations:
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97 assoc.widgetMoved()
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98 self.shouldAdjustAssociations = False
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99
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100 def moveBy(self, dx, dy):
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101 """
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102 Overriden method to move the widget relative.
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103
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104 @param dx relative movement in x-direction (float)
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105 @param dy relative movement in y-direction (float)
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106 """
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107 super().moveBy(dx, dy)
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108 self.adjustAssociations()
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109
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110 def setPos(self, x, y):
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111 """
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112 Overriden method to set the items position.
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113
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114 @param x absolute x-position (float)
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115 @param y absolute y-position (float)
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116 """
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117 super().setPos(x, y)
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118 self.adjustAssociations()
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119
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120 def itemChange(self, change, value):
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121 """
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122 Protected method called when an items state changes.
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123
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124 @param change the item's change (QGraphicsItem.GraphicsItemChange)
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125 @param value the value of the change
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126 @return adjusted values
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127 """
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128 if change == QGraphicsItem.ItemPositionChange:
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129 # 1. remember to adjust associations
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130 self.shouldAdjustAssociations = True
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131
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132 # 2. ensure the new position is inside the scene
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133 rect = self.scene().sceneRect()
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134 if not rect.contains(value):
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135 # keep the item inside the scene
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136 value.setX(min(rect.right(), max(value.x(), rect.left())))
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137 value.setY(min(rect.bottom(), max(value.y(), rect.top())))
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138 return value
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139
0
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140 return QGraphicsItem.itemChange(self, change, value)
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141
945
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142 def paint(self, painter, option, widget=None):
0
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143 """
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144 Public method to paint the item in local coordinates.
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145
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146 @param painter reference to the painter object (QPainter)
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147 @param option style options (QStyleOptionGraphicsItem)
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148 @param widget optional reference to the widget painted on (QWidget)
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149 """
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150 pen = self.pen()
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151 if (option.state & QStyle.State_Selected) == QStyle.State(QStyle.State_Selected):
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152 pen.setWidth(2)
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153 else:
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154 pen.setWidth(1)
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155
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156 painter.setPen(pen)
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157 painter.setBrush(self.brush())
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158 painter.drawRect(self.rect())
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159 self.adjustAssociations()
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160
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161 def setId(self, id):
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162 """
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163 Public method to assign an ID to the item.
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164
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165 @param id assigned ID (integer)
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166 """
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167 self.__id = id
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168
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169 def getId(self):
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170 """
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171 Public method to get the item ID.
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172
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173 @return ID of the item (integer)
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174 """
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175 return self.__id
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176
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177 def getItemType(self):
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178 """
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179 Public method to get the item's type.
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180
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181 @return item type (string)
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182 """
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183 return self.ItemType
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184
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185 def buildItemDataString(self):
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186 """
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187 Public method to build a string to persist the specific item data.
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188
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189 This string must start with ", " and should be built like
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190 "attribute=value" with pairs separated by ", ". value must not contain ", "
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191 or newlines.
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192
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193 @return persistence data (string)
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194 """
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195 return ""
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196
2034
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197 def parseItemDataString(self, version, data):
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198 """
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199 Public method to parse the given persistence data.
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200
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201 @param version version of the data (string)
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202 @param data persisted data to be parsed (string)
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203 @return flag indicating success (boolean)
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204 """
2034
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205 return True

eric ide

mercurial