[IronPython] Python in the Browser updates

Jonathan Slenders jonathan at slenders.be
Wed Jun 18 12:44:41 CEST 2008

2008/6/18 Michael Foord <fuzzyman at voidspace.org.uk>:

> Jimmy Schementi wrote:
>> Michael, question for you:
>>> On every keypress Javascript calls into IronPython (via the C#!).
>> How come you used C# to handle the onkeypress event? This should do it in
>> Python:
> Did you look at the code to see why? I'd be really interested to know if I
> can do what I'm doing from Python inside Silverlight, but I doubt it.
> There's not much code in total, so it should be easy to follow.
> I actually handle the onkeypress event from Javascript (onkeypress.js).
> This calls into 'getSelection' (cursor_pos.js) to work out the current
> selection in the textarea. Naturally this is easy to do in Firefox / Safari
> and scarily awful in IE. :-)
> Having worked these out (and shortcut a few specific scenarios - like
> ctrl-A, ctrl-Z and ctrl-C), the Javascript then calls into IronPython with
> the selection start, selection end, and the character that was pressed. I
> use C# to expose a scriptable type that Javascript can call.
> I use attaching events from Python to provide the sample code. There are
> three links above the console and Python handles the 'onclick' event to swap
> the examples around.

I think Jimmy is right here. And the parts you did in javascript, could also
be done in Silverlight. Some suggestions how I would do this:
- instead of a text area, I'd use a html <div> , with CSS "overflow: auto;"
for the scrollbars.
- insert a <p> tag for each line into the <div>.
- capture the body.onkeypress events for input
- keep a textinput buffer in IronPython, but show the last line by copying
it on each keypress to the last <p>
- The cursor could be <span>, styled in CSS to show a pinking cursor.
- handle the left/right arrows to shift the cursor
- handle the up/down arrows to replace the last <p> with the second last
executed command
- on a "enter" press, process that line.
- when using a <div>, it's even very easy to do syntax highlighting on the
fly. Surround known keywords by a <span class="keyword"> and style them.

That shouldn't be too hard to do. But you should decide whether it's
necessary to have this all in IronPython. Probably, it's the cleanest way to
do it.

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