blocks|key|873401|text|移动到下一个单元格的行为由IPython包装代码定义，它可能检查游标是否位于当前单元格的末尾，并覆盖默认的CodeMirror行为。您必须找到该处理程序，并将其替换为检查游标是否位于最后一行的处理程序。(我对IPython不太了解，只知道CodeMirror，所以我不能指出找到和重写相关代码的正确方法。它们可能已经绑定了Down键，也可能重写了goLineDown+命令。)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|873402|entityMap|0|LINK|mutability|MUTABLE|url|http://codemirror.net/doc/manual.html#commands^0|4H|4|4T|A|54|2|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

The moving-to-next-cell behavior is defined by IPython wrapper code, which probably checks whether the cursor is at the end of the current cell, and overrides the default CodeMirror behavior in that case. You'll have to find that handler and somehow replace it with one that checks whether the cursor is on the last line. (I don't know much about IPython, only about CodeMirror, so I can't point you at the proper way to find and override the relevant code. They might have bound the <code>Down</code> key, or they might have overridden the <code>goLineDown</code> <a href="http://codemirror.net/doc/manual.html#commands" rel="nofollow">command</a>.)

blocks|key|869245|text|我知道在代码单元格的最后一行中跳过“行结束”行为的并不是我一个人，所以我调查了这种行为，并发现：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|869246|当您键入代码单元格的最后一行时(文件:+CodeMirror；“方法”：findPosV和moveV)，它将进入行尾。|unordered-list-item|offset|length|style|CODE|869247|是IPython决定了在CodeMirror+(文件：cell.js；class：Cell；method：handle_codemirror_keyevent)处理"down“事件之后该做什么；查看代码，我发现IPython忽略了事件，而不是在最后一行的最后一个字符。|869248|这在本质上证实了马里金的回答。|869249|主要目标是跳转到下一个单元格，我认为没有必要阻止CodeMirror到达该行的末尾。关键是强制IPython无论如何处理事件。|869250|我的解决方案是将代码从Cell.prototype.handle_codemirror_keyevent更改为：|869251|Cell.prototype.handle_codemirror_keyevent+=+function+(editor,+event)+{
++++var+shortcuts+=+this.keyboard_manager.edit_shortcuts;

++++var+cur+=+editor.getCursor();
++++if((cur.line+!==+0)+&&+event.keyCode+===+38){
++++++++//+going+up,+but+not+from+the+first+line
++++++++//+don't+do+anything+more+with+the+event
++++++++event._ipkmIgnore+=+true;
++++}
++++var+nLastLine+=+editor.lastLine();
++++if+((event.keyCode+===+40)+&&
+++++++++((cur.line+!==+nLastLine))
+++++++)+{
++++++++//+going+down,+but+not+from+the+last+line
++++++++//+don't+do+anything+more+with+the+event
++++++++event._ipkmIgnore+=+true;
++++}
++++//+if+this+is+an+edit_shortcuts+shortcut,+the+global+keyboard/shortcut
++++//+manager+will+handle+it
++++if+(shortcuts.handles(event))+{
++++++++return+true;
++++}

++++return+false;
};|code-block|syntax|javascript|869252|这段代码为“向下箭头”键提供了所需的行为(几乎:光标仍然到行的末尾，只是我们没有看到它，因为我们已经在另一个单元格中了)，并且同样处理“向上箭头”键。|869253|要修改handle_codemirror_keyevent原型，有两种可能：|869254|您编辑cell.js文件并将原型的代码更改为我前面给出的代码。该文件在<python>/Lib/site-packages/IPython/html/static/notebook/js或类似的版本中，取决于您的发行版。|ordered-list-item|869255|要好得多，在加载页面之后，您可以通过以下操作动态地更改该原型：
IPython.Cell.prototype.handle_codemirror_keyevent+=函数(编辑器，事件){+}；
例如，您可以在custom.js中这样做，也可以在创建一个扩展中这样做(这就是我所做的)。|BOLD|869256|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/ipython-contrib/IPython-notebook-extensions/wiki^0|0|10|8|19|5|0|R|7|15|4|1H|Q|0|0|0|B|15|0|0|0|3|Q|0|3|7|Z|1M|0|0|V|W|1T|2Q|19|2X|9|3F|6|0|0^^$0|@$1|2|3|4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1E|8|@$E|1F|F|1G|G|H]|$E|1H|F|1I|G|H]]|9|@]|A|$]]|$1|I|3|J|5|D|7|1J|8|@$E|1K|F|1L|G|H]|$E|1M|F|1N|G|H]|$E|1O|F|1P|G|H]]|9|@]|A|$]]|$1|K|3|L|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1R|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1S|8|@$E|1T|F|1U|G|H]]|9|@]|A|$]]|$1|Q|3|R|5|S|7|1V|8|@]|9|@]|A|$T|U]]|$1|V|3|W|5|6|7|1W|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1X|8|@$E|1Y|F|1Z|G|H]]|9|@]|A|$]]|$1|Z|3|10|5|11|7|20|8|@$E|21|F|22|G|H]|$E|23|F|24|G|H]]|9|@]|A|$]]|$1|12|3|13|5|11|7|25|8|@$E|26|F|27|G|14]|$E|28|F|29|G|14]|$E|2A|F|2B|G|14]|$E|2C|F|2D|G|H]]|9|@$E|2E|F|2F|1|2G]]|A|$]]|$1|15|3|-4|5|6|7|2H|8|@]|9|@]|A|$]]]|16|$17|$5|18|19|1A|A|$1B|1C]]]]

Knowing that I wasn't alone in wanting to skip the "going to end of line" behavior when going down from the last line of a code cell, I investigated that behavior and found out that:

<ul>
<li>it's CodeMirror that goes to the end of line when you type down in the last line of a code cell (file: <code>codemirror.js</code> ; "methods": <code>findPosV</code> and <code>moveV</code>)</li>
<li>and it's IPython that decides what to do with the "down" event after it has been handled by CodeMirror (file: <code>cell.js</code> ; class: <code>Cell</code> ; method: <code>handle_codemirror_keyevent</code>) ; looking at the code, I saw that IPython ignores the event when not at the last character of the last line.</li>
</ul>

This essentially confirms Marijin's answer.

The primary goal being to jump to the next cell, I think there's no need to prevent CodeMirror from going to the end of that line. The point is to force IPython to handle the event anyway.

My solution was to change the code from <code>Cell.prototype.handle_codemirror_keyevent</code> to this:

<pre><code>Cell.prototype.handle_codemirror_keyevent = function (editor, event) {
 var shortcuts = this.keyboard_manager.edit_shortcuts;

 var cur = editor.getCursor();
 if((cur.line !== 0) &amp;&amp; event.keyCode === 38){
 // going up, but not from the first line
 // don't do anything more with the event
 event._ipkmIgnore = true;
 }
 var nLastLine = editor.lastLine();
 if ((event.keyCode === 40) &amp;&amp;
 ((cur.line !== nLastLine))
 ) {
 // going down, but not from the last line
 // don't do anything more with the event
 event._ipkmIgnore = true;
 }
 // if this is an edit_shortcuts shortcut, the global keyboard/shortcut
 // manager will handle it
 if (shortcuts.handles(event)) {
 return true;
 }

 return false;
};
</code></pre>

This code provides the desired behavior for the "down-arrow" key (almost: the cursor still goes to the end of the line, except that we don't see it, as we're already in another cell at that point), and also handles the "up-arrow" key similarly.

To modify the <code>handle_codemirror_keyevent</code> prototype, you have two possibilities:

<ol>
<li>You edit the <code>cell.js</code> file and change the code of the prototype to the code I gave above. The file is in <code>&lt;python&gt;/Lib/site-packages/IPython/html/static/notebook/js</code> or something similar depending on you distro</li>
<li>Much better, after the page is loaded, you change that prototype dynamically by doing this:

<pre><code>IPython.Cell.prototype.handle_codemirror_keyevent = function (editor, event) {
 &lt;same code as above&gt;
};
</code></pre>

You can do that in your <code>custom.js</code> for example, or <a href="https://github.com/ipython-contrib/IPython-notebook-extensions/wiki" rel="nofollow">create an extension</a> to do it (that's what I did).</li>
</ol>

In IPython Notebook / Jupyter, arrow up/down keystrokes within a cell are handled by CodeMirror (as far as I can tell). I use these actions a lot (re-bound to control-p / control-n) to move between cells; but at the end of every cell, the cursor moves to end of line first before jumping to the next cell. This is counter-intuitive and, to me, rather distracting. 

Is there any way to configure CodeMirror to make this move down to be just that - a move down?

Thanks!

"Down arrow" moves cursor to end of line - how to turn it off

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在IPython笔记本/木星中，单元格内上下键的箭头由CodeMirror处理(据我所知)。我经常使用这些操作(重新绑定到control/control)来在单元格之间移动；但是在每个单元格的末尾，光标首先移动到行尾--，然后跳到下一个单元格。这是违反直觉的，而且，对我来说，相当分散注意力。有没有任何方法来配置Code...

问“向下箭头”将光标移至行尾--如何关闭它
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