eric6/Snapshot/SnapshotDefaultGrabber.py

Mon, 23 Sep 2019 19:22:12 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Mon, 23 Sep 2019 19:22:12 +0200
changeset 7259
7c017076c12e
parent 7229
53054eb5b15a
child 7360
9190402e4505
permissions
-rw-r--r--

Continued to resolve code style issue M841.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2019 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 grabber object for non-Wayland desktops.
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8 """
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9
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10
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11 from PyQt5.QtCore import pyqtSignal, Qt, QObject, QTimer, QEvent
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12 from PyQt5.QtGui import QPixmap, QCursor
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13 from PyQt5.QtWidgets import QWidget, QApplication
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14
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15 from .SnapshotModes import SnapshotModes
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16
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17 import Globals
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18
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19
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20 class SnapshotDefaultGrabber(QObject):
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21 """
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22 Class implementing a grabber object for non-Wayland desktops.
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23
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24 @signal grabbed(QPixmap) emitted after the grab operation is finished
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25 """
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26 grabbed = pyqtSignal(QPixmap)
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27
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28 def __init__(self, parent=None):
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29 """
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30 Constructor
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31
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32 @param parent reference to the parent object
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33 @type QObject
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34 """
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35 super(SnapshotDefaultGrabber, self).__init__(parent)
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36
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37 self.__grabber = None
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38 self.__grabberWidget = QWidget(None, Qt.X11BypassWindowManagerHint)
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39 self.__grabberWidget.move(-10000, -10000)
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40 self.__grabberWidget.installEventFilter(self)
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41
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42 from .SnapshotTimer import SnapshotTimer
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43 self.__grabTimer = SnapshotTimer()
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44 self.__grabTimer.timeout.connect(self.__grabTimerTimeout)
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45
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46 def supportedModes(self):
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47 """
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48 Public method to get the supported screenshot modes.
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49
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50 @return tuple of supported screenshot modes
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51 @rtype tuple of SnapshotModes
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52 """
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53 return (
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54 SnapshotModes.Fullscreen,
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55 SnapshotModes.SelectedScreen,
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56 SnapshotModes.Rectangle,
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57 SnapshotModes.Freehand,
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58 SnapshotModes.Ellipse,
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59 )
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60
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61 def grab(self, mode, delay=0, captureCursor=False,
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62 captureDecorations=False):
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63 """
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64 Public method to perform a grab operation potentially after a delay.
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65
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66 @param mode screenshot mode
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67 @type ScreenshotModes
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68 @param delay delay in seconds
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69 @type int
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70 @param captureCursor flag indicating to include the mouse cursor
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71 (not used)
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72 @type bool
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73 @param captureDecorations flag indicating to include the window
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74 decorations (not used)
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75 @type bool
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76 """
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77 self.__mode = mode
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78 if delay:
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79 self.__grabTimer.start(delay)
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80 else:
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81 QTimer.singleShot(200, self.__startUndelayedGrab)
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82
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83 def __grabTimerTimeout(self):
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84 """
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85 Private slot to perform a delayed grab operation.
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86 """
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87 if self.__mode == SnapshotModes.Rectangle:
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88 self.__grabRectangle()
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89 elif self.__mode == SnapshotModes.Ellipse:
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90 self.__grabEllipse()
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91 elif self.__mode == SnapshotModes.Freehand:
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92 self.__grabFreehand()
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93 else:
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94 self.__performGrab(self.__mode)
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95
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96 def __startUndelayedGrab(self):
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97 """
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98 Private slot to perform an undelayed grab operation.
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99 """
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100 if self.__mode == SnapshotModes.Rectangle:
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101 self.__grabRectangle()
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102 elif self.__mode == SnapshotModes.Ellipse:
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103 self.__grabEllipse()
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104 elif self.__mode == SnapshotModes.Freehand:
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105 self.__grabFreehand()
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106 else:
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107 if Globals.isMacPlatform():
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108 self.__performGrab(self.__mode)
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109 else:
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110 self.__grabberWidget.show()
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111 self.__grabberWidget.grabMouse(Qt.CrossCursor)
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112
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113 def __grabRectangle(self):
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114 """
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115 Private method to grab a rectangular screen region.
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116 """
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117 from .SnapshotRegionGrabber import SnapshotRegionGrabber
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118 self.__grabber = SnapshotRegionGrabber(
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119 mode=SnapshotRegionGrabber.Rectangle)
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120 self.__grabber.grabbed.connect(self.__captured)
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121
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122 def __grabEllipse(self):
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123 """
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124 Private method to grab an elliptical screen region.
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125 """
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126 from .SnapshotRegionGrabber import SnapshotRegionGrabber
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127 self.__grabber = SnapshotRegionGrabber(
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128 mode=SnapshotRegionGrabber.Ellipse)
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129 self.__grabber.grabbed.connect(self.__captured)
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130
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131 def __grabFreehand(self):
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132 """
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133 Private method to grab a non-rectangular screen region.
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134 """
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135 from .SnapshotFreehandGrabber import SnapshotFreehandGrabber
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136 self.__grabber = SnapshotFreehandGrabber()
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137 self.__grabber.grabbed.connect(self.__captured)
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138
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139 def __performGrab(self, mode):
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140 """
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141 Private method to perform a screen grab other than a selected region.
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142
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143 @param mode screenshot mode
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144 @type SnapshotModes
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145 """
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146 self.__grabberWidget.releaseMouse()
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147 self.__grabberWidget.hide()
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148 self.__grabTimer.stop()
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149
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150 if mode == SnapshotModes.Fullscreen:
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151 desktop = QApplication.desktop()
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152 snapshot = QApplication.screens()[0].grabWindow(
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153 desktop.winId(), desktop.x(), desktop.y(),
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154 desktop.width(), desktop.height())
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155 elif mode == SnapshotModes.SelectedScreen:
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156 desktop = QApplication.desktop()
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157 if Globals.qVersionTuple() >= (5, 10, 0):
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158 screen = QApplication.screenAt(QCursor.pos())
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159 geom = screen.geometry()
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160 else:
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161 screenId = desktop.screenNumber(QCursor.pos())
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162 geom = desktop.screenGeometry(screenId)
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163 x = geom.x()
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164 y = geom.y()
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165 snapshot = QApplication.screens()[0].grabWindow(
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166 desktop.winId(), x, y, geom.width(), geom.height())
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167 else:
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168 snapshot = QPixmap()
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169
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170 self.grabbed.emit(snapshot)
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171
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172 def __captured(self, pixmap):
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173 """
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174 Private slot to show a preview of the snapshot.
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175
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176 @param pixmap pixmap of the snapshot (QPixmap)
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177 """
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178 self.__grabber.close()
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179 snapshot = QPixmap(pixmap)
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180
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181 self.__grabber.grabbed.disconnect(self.__captured)
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182 self.__grabber = None
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183
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184 self.grabbed.emit(snapshot)
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185
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186 def eventFilter(self, obj, evt):
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187 """
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188 Public method to handle event for other objects.
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189
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190 @param obj reference to the object (QObject)
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191 @param evt reference to the event (QEvent)
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192 @return flag indicating that the event should be filtered out (boolean)
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193 """
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194 if (
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195 obj == self.__grabberWidget and
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196 evt.type() == QEvent.MouseButtonPress
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197 ):
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198 if QWidget.mouseGrabber() != self.__grabberWidget:
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199 return False
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200 if evt.button() == Qt.LeftButton:
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201 self.__performGrab(self.__mode)
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202
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203 return False

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