##// END OF EJS Templates
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Backport PR #2294: inputhook_qt4: Use QEventLoop instead of starting up the QCoreApplication...
Backport PR #2294: inputhook_qt4: Use QEventLoop instead of starting up the QCoreApplication I referenced this branch in #2080 and was letting it sit for a little while, but I have decided to make it a full pull request to get some additional visibility. Essentially our Qt event loop mechanism repeatedly starts and quits a `QCoreApplication` object. Unfortunately the `QCoreApplication::quit` slot has a lot of unintended side effects (like emitting an `aboutToQuit` signal which closes all open file dialogs). For our input hook, we _might_ be able to get by with just using a `QEventLoop` whose quit slot is much simpler and less destructive. For a little bit of background on why one might want to just use `QEventLoop::exec`, let's examine what `QCoreApplication::exec` does: ```c++ int QCoreApplication::exec() { if (!QCoreApplicationPrivate::checkInstance("exec")) return -1; // ... [some assertions] threadData->quitNow = false; QEventLoop eventLoop; self->d_func()->in_exec = true; self->d_func()->aboutToQuitEmitted = false; int returnCode = eventLoop.exec(); threadData->quitNow = false; if (self) { self->d_func()->in_exec = false; if (!self->d_func()->aboutToQuitEmitted) emit self->aboutToQuit(); self->d_func()->aboutToQuitEmitted = true; sendPostedEvents(0, QEvent::DeferredDelete); } return returnCode; } ``` As far as I can tell, it's a small wrapper around `QEventLoop::exec` which also: * Sets some variables regarding the current status * Emits an `aboutToQuit` signal right before the function returns (which is the root cause of @denisri's problem in #2080). Historically, our Qt event loop is a python implementation of the (win 32) input hook supplied with the PyQt4 source (see qtcore_input_hook` in `python-qt4/sip/QtCore/qcoreapplication.sip`), which more or less dates to a [mailing list post](http://www.riverbankcomputing.com/pipermail/pyqt/2007-July/016512.html) from July 2007.
Brian Granger - - Load All Authors

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printnotebook.html
81 lines | 3.2 KiB | text/html | HtmlLexer
/ IPython / frontend / html / notebook / templates / printnotebook.html
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{% extends page.html %}
{% block stylesheet %}
{% if mathjax_url %}
<script type="text/javascript" src="{{mathjax_url}}?config=TeX-AMS_HTML" charset="utf-8"></script>
{% end %}
<script type="text/javascript">
// MathJax disabled, set as null to distingish from *missing* MathJax,
// where it will be undefined, and should prompt a dialog later.
window.mathjax_url = "{{mathjax_url}}";
</script>
<link rel="stylesheet" href="{{ static_url("codemirror/lib/codemirror.css") }}">
<link rel="stylesheet" href="{{ static_url("codemirror/theme/ipython.css") }}">
<link rel="stylesheet" href="{{ static_url("prettify/prettify.css") }}"/>
<link rel="stylesheet" href="{{ static_url("css/notebook.css") }}" type="text/css" />
<link rel="stylesheet" href="{{ static_url("css/printnotebook.css") }}" type="text/css" />
<link rel="stylesheet" href="{{ static_url("css/renderedhtml.css") }}" type="text/css" />
{% end %}
{% block params %}
data-project={{project}}
data-base-project-url={{base_project_url}}
data-base-kernel-url={{base_kernel_url}}
data-read-only={{read_only and not logged_in}}
data-notebook-id={{notebook_id}}
{% end %}
{% block header %}
{% end %}
{% block site %}
<div id="main_app">
<div id="notebook_panel">
<div id="notebook"></div>
</div>
</div>
{% end %}
{% block script %}
<script src="{{ static_url("codemirror/lib/codemirror.js") }}" charset="utf-8"></script>
<script src="{{ static_url("codemirror/mode/python/python.js") }}" charset="utf-8"></script>
<script src="{{ static_url("codemirror/mode/htmlmixed/htmlmixed.js") }}" charset="utf-8"></script>
<script src="{{ static_url("codemirror/mode/xml/xml.js") }}" charset="utf-8"></script>
<script src="{{ static_url("codemirror/mode/javascript/javascript.js") }}" charset="utf-8"></script>
<script src="{{ static_url("codemirror/mode/css/css.js") }}" charset="utf-8"></script>
<script src="{{ static_url("codemirror/mode/rst/rst.js") }}" charset="utf-8"></script>
<script src="{{ static_url("codemirror/mode/markdown/markdown.js") }}" charset="utf-8"></script>
<script src="{{ static_url("pagedown/Markdown.Converter.js") }}" charset="utf-8"></script>
<script src="{{ static_url("prettify/prettify.js") }}" charset="utf-8"></script>
<script src="{{ static_url("dateformat/date.format.js") }}" charset="utf-8"></script>
<script src="{{ static_url("js/events.js") }}" type="text/javascript" charset="utf-8"></script>
<script src="{{ static_url("js/utils.js") }}" type="text/javascript" charset="utf-8"></script>
<script src="{{ static_url("js/initmathjax.js") }}" type="text/javascript" charset="utf-8"></script>
<script src="{{ static_url("js/outputarea.js") }}" type="text/javascript" charset="utf-8"></script>
<script src="{{ static_url("js/cell.js") }}" type="text/javascript" charset="utf-8"></script>
<script src="{{ static_url("js/codecell.js") }}" type="text/javascript" charset="utf-8"></script>
<script src="{{ static_url("js/textcell.js") }}" type="text/javascript" charset="utf-8"></script>
<script src="{{ static_url("js/kernel.js") }}" type="text/javascript" charset="utf-8"></script>
<script src="{{ static_url("js/notebook.js") }}" type="text/javascript" charset="utf-8"></script>
<script src="{{ static_url("js/printnotebookmain.js") }}" type="text/javascript" charset="utf-8"></script>
{% end %}