E5Gui/E5MapWidget.py

Sat, 13 Sep 2014 16:13:52 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sat, 13 Sep 2014 16:13:52 +0200
changeset 3778
0c5bc18da740
parent 3698
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child 3882
447640057bef
permissions
-rw-r--r--

Added more changes to make eric6 usable with PyQt4 as well.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2014 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 a base class for showing a document map.
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8 """
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9
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10 from __future__ import unicode_literals
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11
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12 from PyQt5.QtCore import Qt, QSize, QRect, QCoreApplication, qVersion
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13 from PyQt5.QtGui import QColor, QBrush, QPainter
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14 from PyQt5.QtWidgets import QWidget, QAbstractScrollArea
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15
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16
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17 class E5MapWidget(QWidget):
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18 """
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19 Class implementing a base class for showing a document map.
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20 """
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21 def __init__(self, parent=None):
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22 """
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23 Constructor
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24
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25 @param parent reference to the parent widget (QWidget)
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26 """
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27 super(E5MapWidget, self).__init__(parent)
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28 self.setAttribute(Qt.WA_OpaquePaintEvent)
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29
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30 self.__width = 14
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31 self.__lineBorder = 1
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32 self.__lineHeight = 2
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33 self.__backgroundColor = QColor("#e7e7e7")
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34 self.__setSliderColor()
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35
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36 self._master = None
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37 self.__enabled = False
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38
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39 if parent is not None and isinstance(parent, QAbstractScrollArea):
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40 self.setMaster(parent)
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41
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42 def __setSliderColor(self):
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43 """
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44 Private method to set the slider color depending upon the background
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45 color.
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46 """
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47 if self.__backgroundColor.toHsv().value() < 128:
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48 # dark background, use white slider
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49 self.__sliderColor = Qt.white
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50 else:
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51 # light background, use black slider
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52 self.__sliderColor = Qt.black
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53
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54 def __updateMasterViewportWidth(self):
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55 """
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56 Private method to update the master's viewport width.
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57 """
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58 if self._master:
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59 if self.__enabled:
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60 width = self.__width
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61 else:
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62 width = 0
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63 self._master.setViewportMargins(0, 0, width, 0)
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64
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65 def setMaster(self, master):
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66 """
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67 Public method to set the map master widget.
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68
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69 @param master map master widget (QAbstractScrollArea)
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70 """
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71 self._master = master
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72 self._master.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
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73 self._master.verticalScrollBar().valueChanged.connect(self.repaint)
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74 self.__updateMasterViewportWidth()
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75
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76 def setWidth(self, width):
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77 """
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78 Public method to set the widget width.
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79
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80 @param width widget width (integer)
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81 """
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82 if width != self.__width:
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83 self.__width = max(6, width) # minimum width 6 pixels
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84 self.__updateMasterViewportWidth()
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85 self.update()
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86
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87 def width(self):
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88 """
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89 Public method to get the widget's width.
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90
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91 @return widget width (integer)
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92 """
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93 return self.__width
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94
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95 def setLineDimensions(self, border, height):
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96 """
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97 Public method to set the line (indicator) dimensions.
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98
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99 @param border border width on each side in x-direction (integer)
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100 @param height height of the line in pixels (integer)
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101 """
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102 if border != self.__lineBorder or height != self.__lineHeight:
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103 self.__lineBorder = max(1, border) # min border 1 pixel
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104 self.__lineHeight = max(1, height) # min height 1 pixel
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105 self.update()
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106
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107 def lineDimensions(self):
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108 """
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109 Public method to get the line (indicator) dimensions.
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110
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111 @return tuple with border width (integer) and line height (integer)
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112 """
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113 return self.__lineBorder, self.__lineHeight
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114
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115 def setEnabled(self, enable):
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116 """
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117 Public method to set the enabled state.
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118
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119 @param enable flag indicating the enabled state (boolean)
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120 """
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121 if enable != self.__enabled:
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122 self.__enabled = enable
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123 self.setVisible(enable)
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124 self.__updateMasterViewportWidth()
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125
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126 def isEnabled(self):
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127 """
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128 Public method to check the enabled state.
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129
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130 @return flag indicating the enabled state (boolean)
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131 """
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132 return self.__enabled
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133
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134 def setBackgroundColor(self, color):
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135 """
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136 Public method to set the widget background color.
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137
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138 @param color color for the background (QColor)
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139 """
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140 if color != self.__backgroundColor:
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141 self.__backgroundColor = color
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142 self.__setSliderColor()
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143 self.update()
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144
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145 def backgroundColor(self):
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146 """
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147 Public method to get the background color.
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148
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149 @return background color (QColor)
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150 """
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151 return QColor(self.__backgroundColor)
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152
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153 def sizeHint(self):
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154 """
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155 Public method to give an indication about the preferred size.
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156
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157 @return preferred size (QSize)
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158 """
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159 return QSize(self.__width, 0)
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160
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161 def paintEvent(self, event):
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162 """
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163 Protected method to handle a paint event.
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164
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165 @param event paint event (QPaintEvent)
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166 """
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167 # step 1: fill the whole painting area
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168 painter = QPainter(self)
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169 painter.fillRect(event.rect(), self.__backgroundColor)
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170
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171 # step 2: paint the indicators
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172 self._paintIt(painter)
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173
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174 # step 3: paint the slider
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175 if self._master:
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176 penColor = self.__sliderColor
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177 painter.setPen(penColor)
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178 brushColor = Qt.transparent
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179 painter.setBrush(QBrush(brushColor))
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180 painter.drawRect(self.__generateSliderRange(
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181 self._master.verticalScrollBar()))
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182
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183 def _paintIt(self, painter):
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184 """
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185 Protected method for painting the widget's indicators.
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186
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187 Note: This method should be implemented by subclasses.
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188
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189 @param painter reference to the painter object (QPainter)
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190 """
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191 pass
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192
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193 def mousePressEvent(self, event):
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194 """
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195 Protected method to handle a mouse button press.
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196
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197 @param event reference to the mouse event (QMouseEvent)
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198 """
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199 if event.button() == Qt.LeftButton and self._master:
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200 vsb = self._master.verticalScrollBar()
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201 value = self.position2Value(event.pos().y() - 1)
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202 vsb.setValue(value - 0.5 * vsb.pageStep()) # center on page
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203 self.__mousePressPos = None
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204
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205 def mouseMoveEvent(self, event):
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206 """
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207 Protected method to handle a mouse moves.
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208
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209 @param event reference to the mouse event (QMouseEvent)
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210 """
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211 if event.buttons() & Qt.LeftButton and self._master:
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212 vsb = self._master.verticalScrollBar()
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213 value = self.position2Value(event.pos().y() - 1)
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214 vsb.setValue(value - 0.5 * vsb.pageStep()) # center on page
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215
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216 def wheelEvent(self, event):
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217 """
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218 Protected slot handling mouse wheel events.
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219
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220 @param event reference to the wheel event (QWheelEvent)
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221 """
3778
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222 if qVersion() >= "5.0.0":
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223 isVertical = event.angleDelta().x() == 0
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224 else:
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225 isVertical = event.orientation() == Qt.Vertical
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226 if self._master and \
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227 event.modifiers() == Qt.NoModifier and \
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228 isVertical:
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229 # TODO: test angleDelta() with Mac Trackpad
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230 QCoreApplication.sendEvent(self._master.verticalScrollBar(), event)
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231
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232 def calculateGeometry(self):
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233 """
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234 Public method to recalculate the map widget's geometry.
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235 """
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236 if self._master:
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237 cr = self._master.contentsRect()
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238 vsb = self._master.verticalScrollBar()
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239 if vsb.isVisible():
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240 vsbw = vsb.contentsRect().width()
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241 else:
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242 vsbw = 0
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243 left, top, right, bottom = self._master.getContentsMargins()
3327
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244 if right > vsbw:
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245 vsbw = 0
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diff changeset
246 self.setGeometry(QRect(cr.right() - self.__width - vsbw, cr.top(),
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247 self.__width, cr.height()))
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248
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249 def scaleFactor(self, slider=False):
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250 """
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251 Public method to determine the scrollbar's scale factor.
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252
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253 @param slider flag indicating to calculate the result for the slider
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254 (boolean)
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255 @return scale factor (float)
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parents:
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256 """
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257 if self._master:
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258 delta = 0 if slider else 2
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259 vsb = self._master.verticalScrollBar()
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260 posHeight = vsb.height() - delta - 1
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261 valHeight = vsb.maximum() - vsb.minimum() + vsb.pageStep()
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262 return float(posHeight) / valHeight
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263 else:
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264 return 1.0
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265
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266 def value2Position(self, value, slider=False):
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267 """
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268 Public method to convert a scrollbar value into a position.
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269
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270 @param value value to convert (integer)
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271 @param slider flag indicating to calculate the result for the slider
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272 (boolean)
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273 @return position (integer)
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274 """
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275 if self._master:
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276 offset = 0 if slider else 1
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277 vsb = self._master.verticalScrollBar()
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278 return (value - vsb.minimum()) * self.scaleFactor(slider) + offset
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279 else:
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280 return value
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281
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282 def position2Value(self, position, slider=False):
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Detlev Offenbach <detlev@die-offenbachs.de>
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283 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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284 Public method to convert a position into a scrollbar value.
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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285
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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286 @param position scrollbar position to convert (integer)
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Detlev Offenbach <detlev@die-offenbachs.de>
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287 @param slider flag indicating to calculate the result for the slider
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Detlev Offenbach <detlev@die-offenbachs.de>
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288 (boolean)
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Detlev Offenbach <detlev@die-offenbachs.de>
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289 @return scrollbar value (integer)
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parents:
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290 """
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Detlev Offenbach <detlev@die-offenbachs.de>
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291 if self._master:
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292 offset = 0 if slider else 1
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293 vsb = self._master.verticalScrollBar()
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parents:
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294 return vsb.minimum() + max(
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parents:
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295 0, (position - offset) / self.scaleFactor(slider))
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parents:
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296 else:
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297 return position
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parents:
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298
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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299 def generateIndicatorRect(self, position):
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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300 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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301 Public method to generate an indicator rectangle.
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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302
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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303 @param position indicator position (integer)
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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304 @return indicator rectangle (QRect)
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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305 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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306 return QRect(self.__lineBorder, position - self.__lineHeight // 2,
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parents:
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307 self.__width - self.__lineBorder, self.__lineHeight)
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parents:
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308
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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309 def __generateSliderRange(self, scrollbar):
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
310 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
311 Private method to generate the slider rectangle.
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
312
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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313 @param scrollbar reference to the vertical scrollbar (QScrollBar)
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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314 @return slider rectangle (QRect)
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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315 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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316 pos1 = self.value2Position(scrollbar.value(), slider=True)
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parents:
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317 pos2 = self.value2Position(scrollbar.value() + scrollbar.pageStep(),
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
318 slider=True)
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parents: 3327
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319 return QRect(0, pos1, self.__width - 1, pos2 - pos1)

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