2008-10-04

Functioning Keyboard

The keyboard works!

I’ve added the missing glyphs to the sysfont. Came up with a new glyph for the Ctrl key - a caret (^) with “ctl” written below it. The caret is the standard UNIX symbol for the Ctrl key but I needed some way to distinguish if from the actual caret key, hence the dinky “ctl” text.

I’ve re-worked the layout a bit - it’s now a more standardised American layout rather than the British layout I was originally working towards. It seems that the pound sign (£) isn’t in the standard 7-bit ASCII set; it’s actually 163 in the extended ASCII set. That places it well into the region of glyphs that I’m not intending to support, so there was little point in trying to replicate the British layout if it had a key missing.

The keyboard now acts on click rather than release events. Reacting to release events is of no use if we want to support key repeats whilst the keys are held down. However, the modifier keys still react to release events on other keys. We don’t want the modifiers to reset themselves as soon as a key is pressed because we might need to read the state of the modifiers outside of the keyboard class. So, clicking a key now fires the EVENT_ACTION event from the keyboard, and releasing a key causes any modifiers currently in the “down” position to revert back to the “up” position.

As it makes more sense when you see it in action, here’s the demo that produced the screenshot above:

Keyboard Demo

The code for this is in a new “keyboard” example in the “examples” folder. Wiring the keyboard up to an output window is trivial; there’s barely any code in the example.

Other new things include WoopsiKeyboard::isShiftDown() (etc) functions for reading the modifier states, WoopsiKey::getValue() for getting the display value of a key, and addText(char) methods for both the TextBox and MultiLineTextBox classes.

Things left to do are:

  • Key repeats (still)
  • Some way of removing characters from text boxes, to enable the delete key to work

Once that’s done, I’ll be all set up to enhance the various text box classes with cursor support.

EDIT:

This demo highlights the vertical alignment problems still in the MultLineTextBox class. Must get that fixed.

Comments

chango on 2008-10-21 at 17:41 said:

Hey there!!! It’s been a long time since I visited your site!!! Keep up the good work! I hope more people start using this library to do it’s development! I was wondering if you have any plans to make a Danzeff keyboard??

ant on 2008-10-23 at 11:24 said:

Can’t say I’ve got any plans to at the moment, but there’s no reason why someone couldn’t build one.