Carbon keyboard events
One items on Mac porting list of things to do is keyboard support. For this, we need to understand
which keyboard events you can receive in Carbon. All keyboard events are of
Event Manager Reference
), section Keyboard events.
Four events are interesting for us:
kEventRawKeyDown - some key was pressed down
kEventRawKeyUp - some key was released
kEventRawKeyRepeat - some key was pressed in the past and still held down, so Repeat
event is sent instead of Down event
kEventRawKeyModifiersChanged - the status of some (or even more) keyboard modifiers
Keyboard events can have one of the following parameters (not all parameters are described here):
typeUInt32) - contains information about
status of several modifier keys (see below). This parameter is present with every event
typeUInt32) - see my previous blog about keycodes ;-) Almost
every key on the keyboard has its own keycode. We will probably not use it for all keys, only for
some (see below for reasons.)
typeChar) - contains the character that
this key generates.
present for Up, Down and Repeat events (not for ModifiersChanged event). Notice that Repeat event
doesn't have "repeat count"!
Keyboard modifiers bits are: cmdKeyBit (8), shiftKeyBit (9), alphaLockBit (10), optionKeyBit (11),
controlKeyBit (12), rightShiftKeyBit (13), rightOptionKeyBit (14), rightControlKeyBit (15),
kEventKeyModifierNumLockBit (16), kEventKeyModifierFnBit (17). My keyboard is not able to
distinguish left and right keys though ("left" bit is set instead).
Sample patch for keyboard events handling is here
keys up, down work (even with repeat now). Page Up and Page Down work as well. In the font dialog,
try to enter some font names or variants or even sizes. All should work now (at least it works
here ;-). There are minor issues (matching the current state) - when you select the complete
contents of input box, it is not highlighted etc.