Re: [Fxruby-users] controlling a FXComboBox size

[Sander J. <sa...@kn...>]

ie. LAYOUT_FILL_X prevents the resizing when you select from the list.


On Wednesday 03 December 2003 09:15 pm, Sander Jansen wrote:
> In my experience, for FXComboBox I use the LAYOUT_FILL_X style since it may
> resize itself based on the string it is displaying (so unless you have set
> to biggest string it will have to display, it always adjust its size...
> very annoying).
>
> 	Sander
>
>
> On Wednesday 03 December 2003 08:15 pm, Lyle Johnson wrote:
>
> 0> On Dec 3, 2003, at 4:09 PM, Brett S Hallett wrote:
> > > Find attached a few (small :-) example programs that I generated , the
> > > only
> > > one that produces a "correct" combobox is the one (testfox.rb) which
> > > explicitly uses the coordinate AND size parameters, in every other
> > > case I get
> > > a VERY narrow displayed field ( and drop down field).
> > >
> > > I suspect that I am simply not using the correct opts= parameters to
> > > get the
> > > desired effect, which is :
> > >
> > > a) let the user define the width & height of the combobox field
> > > b) let the field fall into its 'natural' position depending upon the
> > > frame
> > >    type declared.
> >
> > When you specify an explicit (a.k.a. fixed) width for the combo-box,
> > there is obviously no question as to which size the layout manager
> > should assign to that combo-box. But if you don't specify a fixed
> > width, the layout manager needs some other way to determine an
> > appropriate default size for it. (This is of course true for any child
> > widget, but today we're talking about combo-boxes ;)
> >
> > For the combo-box (as well as text fields, and some other widgets) the
> > default size depends on the number of columns passed in as an argument
> > to the constructor. In the case of your examples, you're passing in 1
> > as the number of columns, e.g.
> >
> > 	postcode = FXComboBox.new(combo, 1, 10, nil, 0,
> > FRAME_SUNKEN|FRAME_THICK|COMBOBOX_NORMAL)
> >
> > which causes the combo-box to report a very small default width, since
> > it thinks it only needs to be wide enough to display a string that is
> > one character long. To quickly prove this to yourself, simply change
> > the above line (from testfox1.rb) to read something like:
> >
> > 	postcode = FXComboBox.new(combo, 8, 10, nil, 0,
> > FRAME_SUNKEN|FRAME_THICK|COMBOBOX_NORMAL)
> >
> > and you should like the result better. Of course, the "right" number of
> > columns is going to depend on the lengths of the items' text, which you
> > don't know in advance. Some people get around this by adjusting the
> > number of columns after all of the items have been added, e.g.
> >
> > 	comboBox = FXComboBox.new(p, 1, ...)
> > 	maxStringLen = 0
> > 	itemStrings.each do |itemString|
> > 		comboBox.appendItem(itemString)
> > 		maxStringLen = [maxStringLen, itemString.length].max
> > 	end
> > 	comboBox.numColumns = maxStringLen
> >
> > > Also note the file "testfox.fxs" which is FOX Script Language I am
> > > developing
> > > to see if this shorthand technique of describing forms is a viable
> > > technique.
> > > Although I've had plenty of experience with DELPHI, et al, I'm not
> > > convinced
> > > that a GUI IDE is necessarly the most efficient method for describing
> > > forms
> > > when the developers Language (Ruby) is using a independent GUI tool.
> > > Delphi
> > > works well because of the very tight intergration of Form/Language.
> >
> > I've never used Delphi itself, but have used Borland C++ Builder which
> > is closely related, and yes, it is very nice. A lot of people are
> > interested in "GUI building" tools for FOX and FXRuby (see for example
> > http://fox-tool.rubyforge.org) and so I'm glad you're investigating
> > this alternative approach.
> >
> >
> >
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