'Re: Roberto's themes'

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List:       kde
Subject:    Re: Roberto's themes
From:       mosfet <mosfet () jorsm ! com>
Date:       1998-08-27 16:58:30
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Good example. 

QListBox inherits QTableView. Thus you would need to provide both
a new QTableView and QListBox child. In the QTableView widget, you have to
replace the methods that assigns *vScrollBar and *hScrollBar to a QScrollBar
with an assignment to a KDE themed replacement. Since the replacement widget is
derived from QScrollBar, all you have to do is provide methods for where the
scrollbar is allocated. Since you are not changing that library itself or
providing a replacement of such, I think it would be legal to write methods
identical to the original, only replacing the new statements for themed
children. Tedious, but not difficult. Then your themed QListBox child would
just derive from your new QTableView.       

On Thu, 27 Aug 1998, Roberto Alsina wrote:
>Please notice that there are a few issues with that approach.
>
>For one thing, you need to reimplement a lot of stuff.
>For example, even if you replace QScrollBar with your own XScrollBar, 
>look at QListBox. It creates it's own QScrollBar, and the widget is not 
>created in your code, but in Qt's.
>
>So, you need to reimplement QListBox a lot more deep than you expect.
>
>QMessageBoxes create QPushButtons. QComboBoxes has QlineEdits inside of them.
>
>And so on.
>
>On Thu, 27 Aug 1998, mosfet wrote:
>
>> I thought about this too. Essentially what one can do to get full theme support
>> would be to do the following:
>> 
>> Create a new library, possibly libktheme, that contains children of each QT
>> widget that you want to add theme capability to. These children would have
>> the following methods: 	
>> A) A constructor that reads a KConfig entry for a pixmap and possibly a 
>> foreground and background color entry. We would want to extend color schemes
>> somewhat. Also, we would need to incorparate a check for the parent class.
>> People would probably want different pixmaps/colors for a QButton sitting in a
>> toolbar verses a regular one. Enabling that pixmap in many cases would be
>> simply calling setBackgroundPixmap. In order to be effecient, we would
>> probably want to incorparate inital loading of pixmaps into KApplication (or a
>> theme capable child of it). 	
>> B) The constructor could have three additional arguments: bool enablepixmap,
>> bool enablecolor, bool scale. These would respectively enable the pixmaps,
>> enable the additional color entries, and scale (xForm) the pixmap to the widget
>> size. During testing, all three would default to false. Thus applications can
>> move to using the new widgets before the theming is totally tested, only
>> enabling it for ones known to work. Once the library becomes widely accepted
>> and seems to work well, we could change the default args to true, true, and
>> false.
>> C) We could throw in a few (possibly inline) methods for getting the pixmap,
>> 
>> Using this method, it would be fairly easy to add theme support to KDE. Since
>> the additional constructor parameters all take default values, developers would
>> only need to replace the class names in their code. A sed script could do it.
>> And of course, they would need to link to a new library.
>> 
>> I need to complete a few KDE projects already in progress, but once that is
>> done I would be glad to help.
>> 
>> 
>> Wed, 26 Aug 1998, Kevin Forge wrote: >Martin Konold wrote: >> 
>> >> On Wed, 26 Aug 1998, Roberto Alsina wrote:
>> >> 
>> >> > > Are these scrollbars "home made" or it's something new in Qt ?
>> >> >
>> >> > Those scrollbars are a hack on top of Qt's scrollbars.
>> >> > Not pretty code, but pretty widget, IMHO :-)
>> >> 
>> >> And the nicest thing about this "study" was that Roberto did not change a
>> >> single line of Qt.
>> >
>> >They are cute.  how many people wold want to use those instead ?  
>> >Perhaps we culd have "KScrollbar" or "RScrolbar" in adition to
>> >"QScrollbar" ?
>> >-- 
>> >"So let me get this straight," one IBM lawyer said. 
>> >"We're doing a deal with . . . a Web site?"
>> >http://www.forbes.com/forbes/98/0810/6209094a.htm  For context.
>> >mailto:forgeltd@usa.net  http://www.independence.seul.org
>> >-- 
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>
> ("\''/").__..-''"`-. .         Roberto Alsina
> `9_ 9  )   `-. (    ).`-._.`)  ralsina@unl.edu.ar
> (_Y_.)' ._   ) `._`.  " -.-'   Centro de Telematica
>  _..`-'_..-_/ /-'_.'           Universidad Nacional del Litoral
>(l)-'' ((i).' ((!.'             Santa Fe - Argentina
>                                KDE Developer (MFCH)
>"I can attempt anything, specialization is for insects" (50% Heinlein).
>-- 
>Send posts to:  kde@lists.netcentral.net
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