eric6/E5Gui/E5OverrideCursor.py

Wed, 30 Dec 2020 11:00:44 +0100

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Wed, 30 Dec 2020 11:00:44 +0100
branch
maintenance
changeset 7924
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parent 7775
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child 8118
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permissions
-rw-r--r--

Updated copyright for 2021.

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1 # -*- coding: utf-8 -*-
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2
7924
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3 # Copyright (c) 2020 - 2021 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 context manager class for an override cursor and a
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8 QProcess class controlling an override cursor.
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9 """
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10
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11 import contextlib
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12
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13 from PyQt5.QtCore import pyqtSlot, Qt, QProcess, QEventLoop
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14 from PyQt5.QtGui import QCursor, QGuiApplication
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15
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16
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17 class E5OverrideCursor(contextlib.AbstractContextManager):
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18 """
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19 Class implementing a context manager class for an override cursor.
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20 """
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21 def __init__(self, cursorShape=Qt.WaitCursor):
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22 """
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23 Constructor
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24
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25 @param cursorShape shape of the override cursor
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26 @type Qt.CursorShape
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27 """
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28 self.__cursorShape = cursorShape
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29
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30 def __enter__(self):
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31 """
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32 Special method called when entering the runtime ccontext.
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33
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34 @return reference to the context manager object
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35 @rtype E5OverrideCursor
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36 """
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37 QGuiApplication.setOverrideCursor(QCursor(self.__cursorShape))
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38 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
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39
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40 return self
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41
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42 def __exit__(self, exc_type, exc_value, traceback):
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43 """
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44 Special method called when exiting the runtime ccontext.
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45
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46 @param exc_type type of an exception raised in the runtime context
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47 @param exc_value value of an exception raised in the runtime context
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48 @param traceback traceback of an exception raised in the runtime
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49 context
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50 @return always returns None to not suppress any exception
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51 @rtype None
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52 """
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53 QGuiApplication.restoreOverrideCursor()
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54 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
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55
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56 return None # __IGNORE_WARNING_M831__
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57
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58
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59 class E5OverridenCursor(contextlib.AbstractContextManager):
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60 """
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61 Class implementing a context manager class for an overriden cursor.
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62
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63 The cursor is reset upon entering the runtime context and restored
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64 upon exiting it.
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65 """
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66 def __init__(self):
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67 """
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68 Constructor
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69 """
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70 self.__cursor = None
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71
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72 def __enter__(self):
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73 """
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74 Special method called when entering the runtime ccontext.
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75
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76 @return reference to the context manager object
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77 @rtype E5OverrideCursor
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78 """
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79 self.__cursor = QGuiApplication.overrideCursor()
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80 if self.__cursor is not None:
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81 QGuiApplication.restoreOverrideCursor()
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82 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
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83
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84 return self
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85
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86 def __exit__(self, exc_type, exc_value, traceback):
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87 """
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88 Special method called when exiting the runtime ccontext.
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89
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90 @param exc_type type of an exception raised in the runtime context
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91 @param exc_value value of an exception raised in the runtime context
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92 @param traceback traceback of an exception raised in the runtime
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93 context
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94 @return always returns None to not suppress any exception
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95 @rtype None
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96 """
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97 if self.__cursor is not None:
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98 QGuiApplication.setOverrideCursor(self.__cursor)
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99 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
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100
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101 return None # __IGNORE_WARNING_M831__
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102
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103
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104 class E5OverrideCursorProcess(QProcess):
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105 """
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106 Class implementing a QProcess subclass controlling an override cursor.
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107 """
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108 def __init__(self, parent=None, cursorShape=Qt.WaitCursor):
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109 """
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110 Constructor
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111
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112 @param parent reference to the parent object
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113 @type QObject
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114 @param cursorShape shape of the override cursor
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115 @type Qt.CursorShape
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116 """
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117 super(E5OverrideCursorProcess, self).__init__(parent)
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118
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119 self.__cursorShape = cursorShape
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120
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121 self.started.connect(self.__processStarted)
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122 self.finished.connect(self.__processFinished)
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123
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124 @pyqtSlot()
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125 def __processStarted(self):
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126 """
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127 Private slot setting the cursor after the process has started.
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128 """
787a6b3f8c9f Optimized the use of Waiting Cursors by using a specialized context manager class.
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129 QGuiApplication.setOverrideCursor(QCursor(self.__cursorShape))
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130 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
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131
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Detlev Offenbach <detlev@die-offenbachs.de>
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132 @pyqtSlot()
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133 def __processFinished(self):
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134 """
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135 Private slot resetting the cursor when the process finished.
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Detlev Offenbach <detlev@die-offenbachs.de>
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136 """
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Detlev Offenbach <detlev@die-offenbachs.de>
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137 QGuiApplication.restoreOverrideCursor()
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Detlev Offenbach <detlev@die-offenbachs.de>
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138 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)

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