Transactions and DOM events

A few weeks ago, I talked about reusing code. Working on a similar problem, I found that reusing pre-existing Mozilla code isn’t as easy when the code doesn’t exist.

Take Composer’s Paste command. It takes content from a clipboard and inserts it, sometimes wiping out the pre-existing content to do so. But a paste-content transaction is not a paste-content command. As there’s no obvious transaction class which handles that, I’m stuck. I need a transaction so I can do, undo and redo the paste.

Martin Honnen in the m.d.t.dom newsgroup posted a simple solution for one part of this problem, doing the insertion. I replied, wondering how to undo it. This morning, I think I solved my conceptual problem… in an unorthodox manner.

Whenever an application changes a DOM node in a way, Gecko looks for a mutation event listener for that type of change. If one or more such mutation listeners are applicable, Gecko dispatches a mutation event, and the listeners pick it up.

A transaction, via its doTransaction method, can modify a document in a number of ways, but the types of changes (as far as the DOM and event listeners are concerned) are finite and well-defined. So while the transaction acts on a portion of the document, a specialized set of event listeners can get all the details of the changes. If those details are recorded as a property of the transaction, then undoing the transaction becomes relatively simple: just undo the recorded actions in reverse order. Redoing the transaction is equally simple.

So a few more library functions, and now people who write editors for Verbosio’s XML documents may only need a doRecordedTransaction() (meaning “go forward for the first time”) method

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. Undo and redo are just absorbed into the master application; authors won’t have to write specific code for those cases.

This means another API change to Verbosio (I am making too many of those), but it’s early in the process and not too much code rewriting. Sure, the application has to work harder, but that’s all right. It’s more good stuff for extensions down the road.

Verbosio progress, 01/07/2006

During the winter break, I mostly spent my time off, dealing with various family issues, including the death of my grandfather.

I also implemented adding an attribute to an element. This is significant because it is the first editing action which couldn’t be done inline. Other edits to date have been text node changes, or deleting a node — stuff that doesn’t require a lot of detail. A new attribute can have a namespace URI, a prefix, a local name and a value. That’s four different input fields.

DOM Inspector does this (thanks to bug 205872 and Shawn Wilsher) through a dialog. But I’ve long understood that, as I say in the Verbosio overview, “Dialogs are exceedingly annoying to the end-user.” To solve this, I came up with the idea of an inline <xul:precondition/> element binding. I had even written some mockup code in July 2006 to express how Verbosio should handle preconditions.

Mockup code is, naturally, not real-world code. Over the break, I realized the code was not workable and had to be scrapped. Good intent, presumably good UI, just not usable. A bit of rewriting, some debugging and a real-world application (adding attributes) later, and the code is now operational.

Next on my to-do list is a bit of code reorganization; I wrote a lot of code just for this Inspector-based feature which I expect I’ll be reusing in a more global setting for Verbosio (the XML template editor I talked about a few months ago). I’ll also be implementing the ability to insert new content into a XML document (something I know DOM-I doesn’t do right now). Both of these will be done via the precondition model.

Lastly, for several months I’ve been hunting for a book which describes best practices in user-interface design. It’s one thing to have technical references on UI elements. It’s something else entirely to know how to design a user-friendly UI. The Firefox UI team succeeded at this brilliantly and raised the standard for the rest of us! So I’ve been scratching my head trying to figure out what’s good and what’s bad in UI design, and there is an astonishing lack of written work about that.

Two days ago, I found “Designing Interfaces”, by Jenifer Tidwell. I think this book is exactly what I’ve been looking for – I’ve only gotten into it about three chapters, and it’s a fairly well-written guide. More importantly, it’s not a code-based guide. It guides readers towards sensible, useful user-interface layouts and the motivations behind them

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. I think anyone doing lots of UI work should take a look at this book, and UI reviewers should probably read it too (though they may find they already know most of it).

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Congratulations to the San Diego Chargers for pulling off that last-minute fluke touchdown.

Verbosio progress, 12/20/2006

In developing Verbosio, I’m making localized patches to my mozilla.org source code (as Daniel Veditz correctly points out, fixing mozilla.org bugs that Verbosio needs is Verbosio development)

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. However, these patches haven’t yet been checked into the mozilla.org code, and may need further work before they do. To account for this, I hope to have an addition to the Verbosio bugs page listing the status of certain Verbosio-required bugs with patches people can apply. It needs some minor PHP work I don’t know how to do yet, so stay tuned.

I’ve also updated the make-project code to fix a couple conditions where the Verbosio objdir just wasn’t usable. No more manual hacks there.

I’ve also filed a tracking bug for bugs blocking Verbosio 0.1. Of these, implementing a DOM-Inspector-like viewer for documents is close to completion (the only one so far). It can let you edit elements, attributes, text nodes, character data nodes, processing instructions and comments. Deletion works, and I’m about to start work on insertion, creation and clipboard operations. What to display in the Inspector view for document nodes, I haven’t decided yet.

Tomorrow, I turn 29. Maybe it’s time for another article from me ruminating on technology. It’s really shocking how much I’ve changed, learned and grown as an engineer in three years. Certainly I’m not as depressed as I was then.

Reusing code really is good for the soul.

Now Verbosio can delete a range of nodes and undo that deletion.

I actually was scratching my head last night trying to figure out how I’d break this thorny problem down into manageable pieces. This morning, it occurred to me mozilla.org’s
editor code had already solved this problem in the old Composer application in SeaMonkey, with a DeleteRangeTxn class. If I could create instances of that class from chrome or JS-based component code, I’d be in business.

Unfortunately, nobody seems to have done that before, either. So I filed bug 363290 for that. The patch is in the review pipeline.

I also found out, from reading the code behind this old transaction class, that I needed a nsIEditor object..

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. something I’ve been avoiding until now in Verbosio. So I wrote up a quick & dirty nsIEditor component with most of the methods and properties not implemented. I expect, right now, to use it only as a placeholder for other calls into native transaction code.

If ETNA and Verbosio merge, hopefully ETNA will have a more complete nsIEditor implementation, and use it better than I do. For now, it’ll work, though.

I estimate that it would have taken me at least a week to implement deleting a selection from the document before I thought of Composer. By reusing that code, I reduced my implementation time down to about four hours (nine to ten if you count the long breaks I took today.) That sort of time savings makes me a happy coder.

Verbosio progress, 12/7/2006

Verbosio can now edit text nodes.

That may sound like very little (“sixteen months of work on this, and the best you can do is edit a little string of text?”), but I’ve put a lot of effort into building infrastructure. Just editing text nodes itself turns into a little hassle

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. Text boxes work differently with keystrokes and clipboard pastes, so I had to handle that carefully. I also had to give people the impression that their changes in the textbox were live (that is, the text node updated as they typed) while letting undo work. My work this week has been centered around handling that case in a somewhat predictable manner.

On top of that, it’s not sixteen months of work on just Verbosio… I’ve had to set it aside often, for weeks at a time.

Really, this is just the tip of the iceberg. Now I can work on more interesting abilities, like deleting a range of nodes and undoing that, or changing attributes on an element. Later on, well, things will get very sweet indeed.

XUL Widgets 0.5.2 Released

New in this release:

  • XULWidgets bug 15889: Partial fix for file uploads in serverpost

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    . Thanks to arno for the patch; bug is still open at the moment for further work.

  • The menudeck widget has been resurrected; controldeck turns out to have a few unanticipated bugs.
  • textbox.xml now lets the standard XUL toolkit define the textbox’s editor property. Also a little tweak to prevent a textbox.xml error.
  • XUL Widgets will no longer be supported on the 1.8.0.x branch of Gecko code. That means Firefox 1.5 and SeaMonkey 1.0. (I realize SM 1.1 isn’t quite out yet, but it is expected soon.)

Where’s that “Profiling Code For Dummies” book?

A couple years ago, I was handed a task I did not know how to do: profile a corporate application and see where the code is spending most of its time. I had a professional tool (Quantify) available to help me do it. It took me weeks to figure out how to use it at a basic level, just enough to confirm what we already suspected: that the bottleneck wasn’t in Mozilla code.

Yesterday, while working with some experimental code, I hit a new perf issue that absolutely should not be happening

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. (Bug 362694 for anyone interested.) Profiling and performance analysis is something I do so infrequently that I never took the time to really learn how to do it.

Ultimately, I found that there are a lot of free tools available to help me gather data… but this is worse than useless for me because I can’t figure out what the data is saying. PEBKAC. Someone suggested Shark to me for the Mac platform, but I found Shark didn’t capture anything from my XULRunner app. I’m not blaming Shark; I just don’t know how to use it.

So I wouldn’t mind a good written tutorial in profiling analysis from start to finish for Mozilla code. Particularly under the constraint of free or inexpensive tools. I’d write it if I had a clue what I was doing.

Alex Vincent’s ramblings about Mozilla technology, authoring, and whatever he feels like.