[Lazarus] New NumbersOnly property for TCustomEdit (r43678)

zeljko at holobit.net zeljko at holobit.net
Thu Jan 23 09:55:33 CET 2014

On 2014-01-22 18:50, Frank Poretzky wrote:
> On Wed, 22 Jan 2014 11:43:49 -0200, Alexsander Rosa wrote:
>> 2014/1/22 Mattias Gaertner <nc-gaertnma at netcologne.de>
>>> > Frank Poretzky <poretzky at nym.mixmin.net> hat am 22. Januar 2014 um 13:12
>>> > geschrieben:
>>> >
>>> > On Sat, 11 Jan 2014 13:57:48 +0100, Bart wrote:
>>> >
>>> > >Personally I would go for a T(Float)SpinEdit rather than a MaskEdit.
>>> >
>>> > Yes, that's the easiest way to control range-bound number input. It
>>> > just lacks an option to get rid of those spacious up/down elements.
>>> > Any chance to get that done?
>>> A TSpinEdit without spins elements?
>>> Why not use TEdit?
> You're right, that sounds weird. But why extend a TEdit and add
> Min-/Max-/Value properties including all the logistics behind them to
> get what the Float-/SpinEdit controls already offer?
>> Frank, are you complaining about the SIZE of the arrows?
>> Maybe you need smaller ones (or a property to set their size).
> Sometimes I'd like to have them completely removed, not least to gain
> space.
> Think of a 2-dimensional matrix of numbers, which have to be observed
> though hardly changed, where it may be disturbing to see all those
> values separated by spacious arrows.
> And for what reason do I need gradual ups and downs when entering a
> TCP port number, where there's no logical neighborhood between most of
> them and keyboard usage is the only sufficient way to change a value
> (SMTP ports: ..25..465..587..65535)? In those frequent cases offering
> arrows looks like a joke.
> A single boolean ShowArrows property or, following your idea, an
> integer ArrowsWidth property with '0' removing it completely would
> solve that problem preserving a coherent codebase.

It's not "just like that". What widgetsets supports hiding arrows ? Only 
windows or none ? On the other side we don't have ability to create 
special TEdit + Arrows which can be hidden (arrows must be child of 
TEdit), and that's probably possible only with qt and maybe with win32 
(gtk2/carbon does not support such things).
IMO, only solution atm is to create your own class eg. TNumberEdit and 
handle input events so you can discard anything except numbers.


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