[mcclim-devel] Drei and input focus

[Andy Hefner]

On 1/19/07, Christophe Rhodes <csr21 at cantab.net> wrote:
> Well, I say the "Right Thing": _clearly_ the right thing is to abandon
> this horrific focus-follows-mouse-around-widgets disaster and
> implement a sane keyboard focus policy.  Then much of the complexity
> can go away.  Hooray.  (What did Classic CLIM do?)

I'm not familiar with the horrors of  the Goatee input focus kludge,
but it seems straightforward to implement click-to-focus. I've
attached a trivial test which demonstrates that this does indeed work
(click to focus between two mock text-editor gadgets, although it is
initially focus-follows-mouse until the focus is first assigned by
clicking, as that simply seems to be what X does by default).

There appear to be quite a few things left to do on the keyboard focus
front. The frame already has a slot to store the focus, so we need to
assign the correct initial focus when the frame is adopted. I also
notice the correct timestamps do not reach xlib:set-keyboard-focus,
which needs fixing. There's also the issue of how a gadget can detect
when the window manager has taken the focus away, since there's no
'note' function for it that I'm aware of, and relatedly why my
note-input-focus-changed doesn't appear to work, which I'd intended to
note transfer of the assigned focus within an application. Then
there's the fun parts, like cycling of focus with the tab key.
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