Mercurial Repositories > eric / file comparison
comparison: eric7/E5Gui/E5OverrideCursor.py
eric7/E5Gui/E5OverrideCursor.py
- branch
- eric7
- changeset 8356
- 68ec9c3d4de5
- parent 8355
- 8a7677a63c8d
- child 8357
- a081458cc57b
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| 8355:8a7677a63c8d | 8356:68ec9c3d4de5 |
|---|---|
| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2020 - 2021 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing a context manager class for an override cursor and a | |
| 8 QProcess class controlling an override cursor. | |
| 9 """ | |
| 10 | |
| 11 import contextlib | |
| 12 | |
| 13 from PyQt6.QtCore import pyqtSlot, Qt, QProcess, QEventLoop | |
| 14 from PyQt6.QtGui import QCursor, QGuiApplication | |
| 15 | |
| 16 | |
| 17 class E5OverrideCursor(contextlib.AbstractContextManager): | |
| 18 """ | |
| 19 Class implementing a context manager class for an override cursor. | |
| 20 """ | |
| 21 def __init__(self, cursorShape=Qt.CursorShape.WaitCursor): | |
| 22 """ | |
| 23 Constructor | |
| 24 | |
| 25 @param cursorShape shape of the override cursor | |
| 26 @type Qt.CursorShape | |
| 27 """ | |
| 28 self.__cursorShape = cursorShape | |
| 29 | |
| 30 def __enter__(self): | |
| 31 """ | |
| 32 Special method called when entering the runtime ccontext. | |
| 33 | |
| 34 @return reference to the context manager object | |
| 35 @rtype E5OverrideCursor | |
| 36 """ | |
| 37 QGuiApplication.setOverrideCursor(QCursor(self.__cursorShape)) | |
| 38 QGuiApplication.processEvents( | |
| 39 QEventLoop.ProcessEventsFlag.ExcludeUserInputEvents) | |
| 40 | |
| 41 return self | |
| 42 | |
| 43 def __exit__(self, exc_type, exc_value, traceback): | |
| 44 """ | |
| 45 Special method called when exiting the runtime ccontext. | |
| 46 | |
| 47 @param exc_type type of an exception raised in the runtime context | |
| 48 @param exc_value value of an exception raised in the runtime context | |
| 49 @param traceback traceback of an exception raised in the runtime | |
| 50 context | |
| 51 @return always returns None to not suppress any exception | |
| 52 @rtype None | |
| 53 """ | |
| 54 QGuiApplication.restoreOverrideCursor() | |
| 55 QGuiApplication.processEvents( | |
| 56 QEventLoop.ProcessEventsFlag.ExcludeUserInputEvents) | |
| 57 | |
| 58 return None # __IGNORE_WARNING_M831__ | |
| 59 | |
| 60 | |
| 61 class E5OverridenCursor(contextlib.AbstractContextManager): | |
| 62 """ | |
| 63 Class implementing a context manager class for an overriden cursor. | |
| 64 | |
| 65 The cursor is reset upon entering the runtime context and restored | |
| 66 upon exiting it. | |
| 67 """ | |
| 68 def __init__(self): | |
| 69 """ | |
| 70 Constructor | |
| 71 """ | |
| 72 self.__cursorShape = None | |
| 73 | |
| 74 def __enter__(self): | |
| 75 """ | |
| 76 Special method called when entering the runtime ccontext. | |
| 77 | |
| 78 @return reference to the context manager object | |
| 79 @rtype E5OverrideCursor | |
| 80 """ | |
| 81 cursor = QGuiApplication.overrideCursor() | |
| 82 if cursor is not None: | |
| 83 self.__cursorShape = cursor.shape() | |
| 84 QGuiApplication.restoreOverrideCursor() | |
| 85 QGuiApplication.processEvents( | |
| 86 QEventLoop.ProcessEventsFlag.ExcludeUserInputEvents) | |
| 87 | |
| 88 return self | |
| 89 | |
| 90 def __exit__(self, exc_type, exc_value, traceback): | |
| 91 """ | |
| 92 Special method called when exiting the runtime ccontext. | |
| 93 | |
| 94 @param exc_type type of an exception raised in the runtime context | |
| 95 @param exc_value value of an exception raised in the runtime context | |
| 96 @param traceback traceback of an exception raised in the runtime | |
| 97 context | |
| 98 @return always returns None to not suppress any exception | |
| 99 @rtype None | |
| 100 """ | |
| 101 if self.__cursorShape is not None: | |
| 102 QGuiApplication.setOverrideCursor(QCursor(self.__cursorShape)) | |
| 103 QGuiApplication.processEvents( | |
| 104 QEventLoop.ProcessEventsFlag.ExcludeUserInputEvents) | |
| 105 | |
| 106 return None # __IGNORE_WARNING_M831__ | |
| 107 | |
| 108 | |
| 109 class E5OverrideCursorProcess(QProcess): | |
| 110 """ | |
| 111 Class implementing a QProcess subclass controlling an override cursor. | |
| 112 """ | |
| 113 def __init__(self, parent=None, cursorShape=Qt.CursorShape.WaitCursor): | |
| 114 """ | |
| 115 Constructor | |
| 116 | |
| 117 @param parent reference to the parent object | |
| 118 @type QObject | |
| 119 @param cursorShape shape of the override cursor | |
| 120 @type Qt.CursorShape | |
| 121 """ | |
| 122 super().__init__(parent) | |
| 123 | |
| 124 self.__cursorShape = cursorShape | |
| 125 | |
| 126 self.started.connect(self.__processStarted) | |
| 127 self.finished.connect(self.__processFinished) | |
| 128 | |
| 129 @pyqtSlot() | |
| 130 def __processStarted(self): | |
| 131 """ | |
| 132 Private slot setting the cursor after the process has started. | |
| 133 """ | |
| 134 QGuiApplication.setOverrideCursor(QCursor(self.__cursorShape)) | |
| 135 QGuiApplication.processEvents( | |
| 136 QEventLoop.ProcessEventsFlag.ExcludeUserInputEvents) | |
| 137 | |
| 138 @pyqtSlot() | |
| 139 def __processFinished(self): | |
| 140 """ | |
| 141 Private slot resetting the cursor when the process finished. | |
| 142 """ | |
| 143 QGuiApplication.restoreOverrideCursor() | |
| 144 QGuiApplication.processEvents( | |
| 145 QEventLoop.ProcessEventsFlag.ExcludeUserInputEvents) |
