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inputhook: move inputhook_qt4 related code in own file
Christian Boos -
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@@ -0,0 +1,90 b''
1 # -*- coding: utf-8 -*-
2 """
3 Qt4's inputhook support function
4
5 Author: Christian Boos
6 """
7
8 #-----------------------------------------------------------------------------
9 # Copyright (C) 2011 The IPython Development Team
10 #
11 # Distributed under the terms of the BSD License. The full license is in
12 # the file COPYING, distributed as part of this software.
13 #-----------------------------------------------------------------------------
14
15 #-----------------------------------------------------------------------------
16 # Imports
17 #-----------------------------------------------------------------------------
18
19 from IPython.core import ipapi
20 from IPython.external.qt_for_kernel import QtCore, QtGui
21 from IPython.lib.inputhook import stdin_ready
22
23 #-----------------------------------------------------------------------------
24 # Code
25 #-----------------------------------------------------------------------------
26
27 def create_inputhook_qt4(mgr, app=None):
28 """Create an input hook for running the Qt4 application event loop.
29
30 Parameters
31 ----------
32 mgr : an InputHookManager
33
34 app : Qt Application, optional.
35 Running application to use. If not given, we probe Qt for an
36 existing application object, and create a new one if none is found.
37
38 Returns
39 -------
40 A pair consisting of a Qt Application (either the one given or the
41 one found or created) and a inputhook.
42
43 Notes
44 -----
45 The inputhook function works in tandem with a 'pre_prompt_hook'
46 which automatically restores the hook as an inputhook in case the
47 latter has been temporarily disabled after having intercepted a
48 KeyboardInterrupt.
49 """
50 if app is None:
51 app = QtCore.QCoreApplication.instance()
52 if app is None:
53 app = QtGui.QApplication([" "])
54
55 # Always use a custom input hook instead of PyQt4's default
56 # one, as it interacts better with readline packages (issue
57 # #481).
58
59 # Note that we can't let KeyboardInterrupt escape from that
60 # hook, as no exception can be raised from within a ctypes
61 # python callback. We need to make a compromise: a trapped
62 # KeyboardInterrupt will temporarily disable the input hook
63 # until we start over with a new prompt line with a second
64 # CTRL+C.
65
66 got_kbdint = [False]
67
68 def inputhook_qt4():
69 try:
70 app.processEvents(QtCore.QEventLoop.AllEvents, 300)
71 if not stdin_ready():
72 timer = QtCore.QTimer()
73 timer.timeout.connect(app.quit)
74 while not stdin_ready():
75 timer.start(50)
76 app.exec_()
77 timer.stop()
78 except KeyboardInterrupt:
79 got_kbdint[0] = True
80 mgr.clear_inputhook()
81 print("\n(event loop interrupted - "
82 "hit CTRL+C again to clear the prompt)")
83 return 0
84
85 def preprompthook_qt4(ishell):
86 if got_kbdint[0]:
87 mgr.set_inputhook(inputhook_qt4)
88 ipapi.get().set_hook('pre_prompt_hook', preprompthook_qt4)
89
90 return app, inputhook_qt4
@@ -204,50 +204,10 b' class InputHookManager(object):'
204 204 from PyQt4 import QtCore
205 205 app = QtGui.QApplication(sys.argv)
206 206 """
207 from IPython.external.qt_for_kernel import QtCore, QtGui
208 from IPython.core import ipapi
209
210 if app is None:
211 app = QtCore.QCoreApplication.instance()
212 if app is None:
213 app = QtGui.QApplication([" "])
214
215 # Always use a custom input hook instead of PyQt4's default
216 # one, as it interacts better with readline packages (issue
217 # #481).
218
219 # Note that we can't let KeyboardInterrupt escape from that
220 # hook, as no exception can be raised from within a ctypes
221 # python callback. We need to make a compromise: a trapped
222 # KeyboardInterrupt will temporarily disable the input hook
223 # until we start over with a new prompt line with a second
224 # CTRL+C.
225
226 got_kbdint = [False]
227
228 def inputhook_qt4():
229 try:
230 app.processEvents(QtCore.QEventLoop.AllEvents, 300)
231 if not stdin_ready():
232 timer = QtCore.QTimer()
233 timer.timeout.connect(app.quit)
234 while not stdin_ready():
235 timer.start(50)
236 app.exec_()
237 timer.stop()
238 except KeyboardInterrupt:
239 got_kbdint[0] = True
240 self.clear_inputhook()
241 print("\n(event loop interrupted - "
242 "hit CTRL+C again to clear the prompt)")
243 return 0
207 from IPython.lib.inputhookqt4 import create_inputhook_qt4
208 app, inputhook_qt4 = create_inputhook_qt4(self, app)
244 209 self.set_inputhook(inputhook_qt4)
245 210
246 def preprompthook_qt4(ishell):
247 if got_kbdint[0]:
248 self.set_inputhook(inputhook_qt4)
249 ipapi.get().set_hook('pre_prompt_hook', preprompthook_qt4)
250
251 211 self._current_gui = GUI_QT4
252 212 app._in_event_loop = True
253 213 self._apps[GUI_QT4] = app
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