From kde-devel  Wed Dec 01 16:26:32 2004
From: Holger Schroeder <holger-kde () holgis ! net>
Date: Wed, 01 Dec 2004 16:26:32 +0000
To: kde-devel
Subject: Re: [PATCH] konqueror keyboard link navigation
Message-Id: <200412011726.32702.holger-kde () holgis ! net>
X-MARC-Message: https://marc.info/?l=kde-devel&m=110191803017057

On Wednesday 01 December 2004 12:49, Robert Ewald wrote:
> Hi,
>
> I made a patch implementing my idea of efficient link navigation in an html
> view.
>
> It works as follows:
>
> In an HTML view you hit 'd' and a tooltips over each visible link is
> displayed. The tooltip contains a keysequence to access that link. Entering
> the keysequence focusses the link and upon hitting enter the link is
> followed (although that does not work reliably yet).
>
> Implementation details:
>
> Upon hitting 'D' displayLinkNavTooltips() is called. Each Element in the
> HTMLTree is traversed and tested for HREF. If this Element is also visible,
> it is added to the list linkNavElements.
>
> To fill the tooltips the 26 characters in the alphabet are seen as a
> number, with a=0 and z=26. Converting the position of the element in the
> list to base26 yields a keysequence, which is displayed in the tooltip.
>
> linkNavActivated is set to true and on further keypresses,
> dispatchKeyEventHelper fills a search string, which is converted to a
> decimal position in the element list. This Element is then focussed.
>
> Thats what I think I have implemented. At the moment the element is only
> focussed. I would rather have, that the keypresses are enough so no enter
> is needed. Therefore I have to determine the number of characters needed in
> the tooltips. For this task i would need to include "math.h" (or anything
> implementing a log or ln  function). I am reluctant to add a dependency,
> thats why I would like some advice.
>
i think you can simply check for the different cases:

int k = 0;
int c = visibleRects.count();

if ( c <= 26 )
{
 k = 1;
}
else if ( c <= 26*26 )
{
 k = 2;
}
else if ( c <= 26*26*26 )
{
 k = 3;
}

so no need for a log here. perhaps this is even faster then calculating the 
logs.
> Thanks
>
> Robert Ewald

Holger
 
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