Posts in category development - page 6

Ten commandments for developers

In order that applications and operating systems shall not drive users insane, thou shall:

1. Allow immediate termination

I hit the wrong button. I changed my mind. I didn’t know it would take this long.

Either way, the operation needs a cancel button that causes immediate effect and quickly clean up what it can.

If it was copying or uploading a file, delete what was done. For database operations, rollback the transaction. Formatting a disk leave it half formatted and un-format the first sector but do it FAST.

If you think the consequences are too great, ask what effect forceful termination or switching off the power is going to be like in comparison.

2. Leave start-up alone

I’ll do that right now; just let me log in… Zzz… Sorry. It should be done in a minute. Sigh.

Your app might be the centre of your world developing day and night – it’s not the centre of mine.

I might use it for several hours a day if you’re lucky. That doesn’t mean I want it starting automatically unasked.

It also doesn’t mean you can install services, background tasks or other junk that prevents me from doing what I need when I’m in a hurry and running with a low battery.

If you need to check for updates, do it silently in the background when I launch the app or add something to the Windows scheduler. Don’t create an entire service.

3. Not modify existing file associations

I tried that last time, and it screwed up my associations. I’m not going to try the new version no matter what.

I might want all video files to go through your app. I might not.

Let me make that choice and reverse it. If I uninstall your program, reverse it automatically and clean up the registry.

Associating every media file on my system with your app isn’t going to wow me. It isn’t going to make the sale or make me believe my system can’t live without your software.

There may be incompatibilities. Features you don’t support or perhaps a clunky UI, and I’ll uninstall your app to go back to my old favourite.

When all my associations break, you can’t bet I won’t be coming back to see what you’ve done in version 2.

4. Not ask inappropriate questions

Do you want to move or copy files from this zone? Yes or No.

Zone? What? Err, copy please. What do you mean, Yes or No?

I just performed a non-destructive operation, and you want me to confirm it?

Do you want to remember your password?

An insanely stupid question that appears after a login box doesn’t have a password stored, either because:

  • I don’t use the feature but can’t switch it off (never ask me again)
  • I’m not on my own computer (shut up for 30 minutes)
  • I have a new machine and haven’t typed it for months (ask me in 10 seconds when I find out if it’s right)

You rarely get useful options, but at least Firefox 3 realizes it should ask quietly at the top of the page after you can see if it worked.

5. Keep noise to a minimum

Windows has installed updates! AVG Anti-Virus updated successfully.

Business-as-normal – I DON’T CARE.

If there is a problem updating, let me know – unless it’s something simple that goes away without my involvement in a day or so.

People don’t call or message me day in and out to tell me nothing, neither should my computer.

This also goes for audio notification of trivial activities.

Don’t annoy people in their offices and homes with stupid noises just because somebody on the other side of the world has logged in.

6. Stay focused on the goal

The instant messaging crown was taken from ICQ because they overloaded the client with games and junk. People wanted simple messaging, but by the time they figured this out and delivered ICQ Lite, it was too late.

REAL repeated the same blunder where a good video player expanded to consume all available files, starting messaging me and breaking every commandment there is.

Adobe believes Acrobat should be more than a quick PDF viewer for physical page reproduction. They built a piggyback mechanism for a whole document management system. People don’t want their web browser locking up for 20 seconds while they load plug-in’s they’ll never use.

7. Make actions obvious and reversible

I don’t want a dialogue box with some sob story about why your app can’t do what I just asked or three paragraphs of text I have to scan for negatives, digest and mentally figure out what Yes and No will actually do.

Even worse is prompting a slightly different message with the same Yes and No options sending the user to the button they normally hit for a totally different message with potentially disastrous results.

If Yes is doing to delete the file label the button Delete. Dialogs in OS X do this, and you can answer them lightning fast with accurate results.

Better yet, just do it, put some text in the status bar, update the UI and learn how to write an undo mechanism.

8. Avoid restarts

If your application absolutely has to install a service, start it yourself.

If common files you are installing might be in use, check them or, better yet, put them in your own application folder.

9. Make configurations count

Adding options to your application is a choice to a certain point. Beyond that, it causes people to be unable to find the option they are looking for, becoming bewildered at the choices available before quickly heading to the close button instead.

If you absolutely must have extra options that only a small percentage of the population care about, just store them in the configuration system and forget about giving it presence on the user interface.

10. Adhere to the platform

Read user interface guidelines and only deviate when you know better than the expert team behind them. If you have to explain it, then you didn’t know better after all.

If the operating system has conventions for files, configuration and help, use them. Don’t claim that being the same across platforms is more important – people who use more than one platform know and expect them to be different already.

If you want to use an update, notification, or other commodity services, find what is already popular and a good fit and use that, don’t develop something different.


More screen-shots of Envy Code R preview #7

Work on my Envy Code R programming font has resumed and I’ve spent hours playing with the hinting process to ensure it looks good at sizes above and below 10 point:

Screen-shot of Envy Code R PR7 without smoothing on WindowsScreenshot of Envy Code R PR7 with standard smoothing on WindowsScreenshot of Envy Code R PR7 with ClearType on Windows

These look great – even more so when you consider there are no embedded bitmaps and very few delta hints.

There is still a lot of work to do – all the foreign characters, symbols and box-drawing characters (another 600 glyphs) require hinting and I should test it on the Mac, Java and Flash font rendering engines to make sure there are no show-stoppers there.

Preview 7 will consist of of just a plain style regular and bold because I need to get this out – it’s been too long since the last release. Preview 8 will add back italics and the Visual Studio italics-as-bold hack shortly afterwards.

Check out Talios’s shots using Java/Linux and Eddy Young’s shots in NetBeans.

A newer version of Envy Code R is available.


Safari 3.1 includes developer tools

Safari 3.1 has just been released and besides the partial CSS3 (fonts) and partial HTML5 (media tags, off-line storage) support there are some new developer tools included.

Safari has had a hidden Debug menu for some time and WebKit featured developer tools but with 3.1 Apple have unleashed them to the masses.

Head into Preferences > Advanced and choose Show Develop menu in menu bar to get this new Develop menu.

It includes:

  • Open Page With (Internet Explorer, Firefox 2/3, Camino, Mobile Safari etc.)
  • User Agent switching
  • Show Web Inspector (inspect element)
  • Show Error Console (including HTML errors)
  • Show Network Timeline (like Firebug’s network view)
  • Show Snippet Editor
  • Disable Caches/Images/Styles
  • Disable JavaScript/Runaway JavaScript Timer/Site-specific hacks

Here’s the Network Timeline in action on OS X:

Screen-shot of Safari 3.1's Network Timeline on Mac OS X

There are some odd drawing issues within the snippet editor and inspecting from the inspector on Windows but with this, Firebug and Internet Explorer 8’s Developer Tools we’re spoiled for choice!


And no, it doesn’t pass the rather abstract Acid3 test

Testing web sites with the iPhone SDK

Apple’s iPhone SDK is now available in beta format for free download (running your apps on a real iPhone is a one-time $99 charge).

The 2.1GB download contains the full Xcode 3.1 environment for Mac app development but also an extra 22MB of iPhone-specific SDK goodness including an iPhone simulator named Aspen Simulator (perhaps the code-name for iPhone). Whilst most of the iPhone’s apps are absent you can still access settings, photos, Safari and contacts.

Besides the cool idea of creating real iPhone apps you can also use Mobile Safari to test your sites on an iPhone – very cool! Here’s in the simulator when twisted round 90′. rendered on the iPhone