Lose focus event?

dgm · January 19, 2008, 6:20pm

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I’m new to wxruby, and I haven’t found any answer with google: Is
there a way to capture a lose focus event on controls, such as a combo
box? All my experiments show events when changing the text, but not
when leaving the box.

I want to make a combobox that autocompletes if I press tab (or down
arrow or something), but if I click out or hit enter it needs to
prompt me to add a new value. I’m trying to duplicate a behaviour in
an Access app - I’d really like to ditch Access!

On a higher level explanation, in case there’s a better way to do it…

I want it to search as I type, displaying possible matches, and let me
complete with one of the matches, or if there is no match use the
current search to create a new record.

David M.
Maia Mailguard http://www.maiamailguard.com
[email protected]

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dgm · January 19, 2008, 6:40pm

Hello David,

First off, welcome to the wxRuby community. Always nice to see new
faces
around, and more interest being sparked in wxRuby, especially since it
is
getting more stable with every release we make. To capture Focus Lost,
you
would need to use evt_kill_focus(), this detects when a control looses
focus. It’s specifically for Windows, but since 99.9 percent of the
classes
we use in wxRuby, are derived from wxWindow, you should be able to
utilize
the evt_kill_focus() to detect when a control (Such as a combo box), has
lost focus.

Don’t think we have a full example of evt_kill_focus() and it’s
counterpart
evt_set_focus(), but it’s pretty simple, and you can find the docs for
it
here: http://wxruby.rubyforge.org/doc/focusevent.html

If you have any more questions, feel free to ask, we’re more then happy
to
help out.

L8ers,

Mario S.

dgm · January 19, 2008, 10:27pm

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On Jan 19, 2008, at 11:39 AM, Mario S. wrote:

Don’t think we have a full example of evt_kill_focus() and it’s
counterpart evt_set_focus(), but it’s pretty simple, and you can
find the docs for it here: http://wxruby.rubyforge.org/doc/focusevent.html

If you have any more questions, feel free to ask, we’re more then
happy to help out.

Thanks for the generous welcome. I’m usually a unix person, and web
based, but got roped into working on an Access project. (Hence why I’d
rather do this in ruby)

GUI stuff by hand is quite new to me.

I see that event firing, but it appears global, firing for everything
that loses focus. I’ve tried to identify what object was responsible
via #get_event_object, #get_id, and #id, but no luck so far. How do
I associate it with the combo box?

require ‘rubygems’

require “wx”
include Wx

class HelloWorld < App
def on_init
helloframe = Frame.new(nil, -1, “Hello World”)

  button = Button.new(helloframe, :label => 'Close', :pos =>

[200,200])
evt_button(button) {exit}
cbo = ComboBox.new(helloframe,
:pos =>Point.new(10,10),
:choices => [“foo”,“bar”],
:value => “asdasd”,
:style => CB_SORT)
helloframe.show()
evt_set_focus() {|w|
# how do I tie this to cbo ?
}
end
end
HelloWorld.new.main_loop

David M.
Maia Mailguard http://www.maiamailguard.com
[email protected]

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dgm · January 20, 2008, 1:23am

evt_focus does capture all focus changes. The thing to do, is utilize
EvtFocus.get_window, that will return the window that the focus is being
called for.

dgm · January 20, 2008, 1:13am

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I see that event firing, but it appears global, firing for everything
that loses focus. I’ve tried to identify what object was responsible
via #get_event_object, #get_id, and #id, but no luck so far. How do
I associate it with the combo box?

I found and example in
HTTP://wxruby.rubyforge.org/svn/trunk/wxruby2/samples/controls/

but it doesn’t work. Did you mean MS Windows when you said it was
related to windows, or WX windows?

class MyComboBox < ComboBox
def initialize(*args)
super(*args)#, style)

 evt_set_focus {|event| onFocusGot(event)}

end

def onFocusGot(event)
log_message(“MyComboBox::OnFocusGot”)
event.skip()
end

end

David M.
Maia Mailguard http://www.maiamailguard.com
[email protected]

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dgm · January 20, 2008, 1:40am

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On Jan 19, 2008, at 6:22 PM, Mario S. wrote:

evt_focus does capture all focus changes. The thing to do, is
utilize EvtFocus.get_window, that will return the window that the
focus is being called for.

test.rb:63:in on_init': undefined method 'get_window' for #<Wx::FocusEvent:0x11d26a98> (NoMethodError) from test.rb:68:in call’
from test.rb:68:in `main_loop’
from test.rb:68

class HelloWorld < App
def on_init
helloframe = Frame.new(nil, -1, “Hello World”)

  button = Button.new(helloframe, :label => 'Close', :pos =>

[200,200])
evt_button(button) {exit}
cbo = MyComboBox.new(helloframe,
:pos =>Point.new(10,10),
:choices => [“foo”,“bar”],
:value => “asdasd”,
:style => CB_SORT)
helloframe.show()
evt_set_focus() {|w|
puts w.get_window
# how do I tie this to cbo ?
}
end
end
HelloWorld.new.main_loop

David M.
Maia Mailguard http://www.maiamailguard.com
[email protected]

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dgm · January 21, 2008, 1:07am

Hi David

David M. wrote:

I see that event firing, but it appears global, firing for everything
that loses focus. I’ve tried to identify what object was responsible
via #get_event_object, #get_id, and #id, but no luck so far. How do
I associate it with the combo box?

FocusEvents aren’t CommandEvents, so they don’t “bubble” upwards to
parent widgets. So I think you need to call the evt_kill_focus method on
each ComboBox instance. Have a look at the event handling tutorial in
the main API docs for more info.

get_event_object should return the widget that triggered any event.

  cbo = ComboBox.new(helloframe,
                     :pos =>Point.new(10,10),
                     :choices => ["foo","bar"],
                     :value => "asdasd",
                     :style => CB_SORT)
  helloframe.show()
  evt_set_focus() {|w|
    # how do I tie this to cbo ?
    }
end

try:
cbo.evt_set_focus { … }

Note that there’s a bug on OS X that means ComboBoxes aren’t firing
evt_kill_focus for some reason. But it should work fine on Windows or
Linux.

hth
alex

dgm · January 20, 2008, 3:38am

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From what I can tell from various wxwidget sources, it seems that
most controls do not send the event up to the control level, and I saw
one post that was attempting to bind an event… is this the
EvtHandler#connect method?

On Jan 19, 2008, at 6:22 PM, Mario S. wrote:

everything
related to windows, or WX windows?
log_message(“MyComboBox::OnFocusGot”)

wxruby-users mailing list
http://rubyforge.org/projects/wxride/
http://rubyforge.org/projects/vwmc/

wxruby-users mailing list
[email protected]
http://rubyforge.org/mailman/listinfo/wxruby-users

David M.
Maia Mailguard http://www.maiamailguard.com
[email protected]

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dgm · January 21, 2008, 1:24am

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On Jan 20, 2008, at 6:07 PM, Alex F. wrote:

Note that there’s a bug on OS X that means ComboBoxes aren’t firing
evt_kill_focus for some reason. But it should work fine on Windows
or Linux.

Hah, I just fired off a message about that. lol. Is this a wxwidgets
thing, or a deeper OS X thing?

David M.
Maia Mailguard http://www.maiamailguard.com
[email protected]

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dgm · January 21, 2008, 1:36am

David M. wrote:

I uncommented that log_message call in onFocusGot(). It works in
WinXP, but it does not work in OS X. In XP, I get a popup with that
message, but in OS X, nothing happens at all. Eventually the pp is
going to be used in XP, but I’d like to develop on OS X. Any ideas?

http://rubyforge.org/tracker/index.php?func=detail&aid=5532&group_id=35&atid=218

It’s a bug I would very much like to fix as I want to do something
similar to what you describe in my own app. But I suspect it’s a
wxWidgets problem, and haven’t got around to writing a C++ test case to
find out.

As a workaround you could use evt_child_focus, which definitely does
work on OS X. You cna use get_window to see what child received focus,
and if you track what the last focus was, you could see when the CB lost
focus.

alex

dgm · January 21, 2008, 1:16am

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Starting over on this thread. I found an example in the sample code
controls/controls.rb around line 110-149:

class MyComboBox < ComboBox
def initialize(parent,id,value = EmptyString,
pos = DEFAULT_POSITION,
size = DEFAULT_SIZE,
choices = [],
style = 0)
super(parent, id, value, pos, size, choices)#, style)

 evt_char {|event| onChar(event)}
 evt_key_down {|event| onKeyDown(event)}
 evt_key_up {|event| onKeyUp(event)}

 evt_set_focus {|event| onFocusGot(event)}

end

[snip]

def onFocusGot(event)
log_message(“MyComboBox::OnFocusGot”)
event.skip()
end
end

I uncommented that log_message call in onFocusGot(). It works in
WinXP, but it does not work in OS X. In XP, I get a popup with that
message, but in OS X, nothing happens at all. Eventually the pp is
going to be used in XP, but I’d like to develop on OS X. Any ideas?

David M.
Maia Mailguard http://www.maiamailguard.com
[email protected]

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