[Oberon] Trying to understand vertical scrolling

[Srinivas Nayak]

Dear Chris,

Your opinion is very much correct.
As Peter suggested, ET shows exactly this behavior.

As a side note, I also think, some of my messages disappear.
Not sure why....

With thanks and best regards,

Yours sincerely,
Srinivas Nayak

Home: http://www.mathmeth.com/sn/
Blog: http://srinivas-nayak.blogspot.in/

On 04/08/2016 06:38 PM, Chris Burrows wrote:
>> -----Original Message-----
>> From: Oberon [mailto:oberon-bounces at lists.inf.ethz.ch] On Behalf Of
>> Srinivas Nayak
>> Sent: Friday, 8 April 2016 3:36 PM
>> To: ETH Oberon and related systems
>> Subject: [Oberon] Trying to understand vertical scrolling
>>
>> Dear All,
>>
>> When I MR click on scroll bar of System.Text, I see that instead of
>> directly going to the beginning of System.text, it takes several MR
>> clicks to reach line number 1 of System.Text
>>
>
> Click MM near the top of the scrollbar to scroll to the beginnng of text.
> Click MM near the bottom of the scroll bar to scroll to the end of text.
>
>> I found, in Martin Reiser's book, section 2.4.3, it is written that:
>>
>> Then:
>> - Clicking the right key scrolls to the beginning OF THE TEXT.
>> ...
>
> I'm not sure exactly what he meant either :(
>
> This is how it works:
>
> MR clicking (scroll up) corresponds to ML clicking (scroll down) but in
> reverse. i.e. ML clicking scrolls the text so that the line that was next to
> the mouse pointer becomes the *first* line of the window.  MR clicking
> scrolls the text so that the line that was next to the mouse pointer becomes
> the *last* line of the window.
>
> Hence the number of lines scrolled depends on whether the mouse pointer is
> positioned nearer the top or the bottom of the scrollbar when you click the
> button.
>
> If you ML click near the top of the scrollbar, scroll down movement is only
> a couple of lines. If you ML click near the bottom of the scroll bar the
> scroll down movement is almost the whole screen.
>
> Conversely, if you MR click near the top of the scrollbar, scroll up
> movement is almost a whole screen. If you MR click near the bottom of the
> scroll bar the scroll up movement is only a couple of lines.
>
> Regards,
> Chris
>
> Chris Burrows
> CFB Software
> http://www.cfbsoftware.com
>
>
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