<table><tr><td style="">rmacmaster abandoned this revision.<br />rmacmaster added a comment.
</td><a style="text-decoration: none; padding: 4px 8px; margin: 0 8px 8px; float: right; color: #464C5C; font-weight: bold; border-radius: 3px; background-color: #F7F7F9; background-image: linear-gradient(to bottom,#fff,#f1f0f1); display: inline-block; border: 1px solid rgba(71,87,120,.2);" href="https://phabricator.kde.org/D9857" rel="noreferrer">View Revision</a></tr></table><br /><div><div><p>Sorry, I sort of abandoned this patch because I got caught up in other things.</p>
<div class="remarkup-code-block" style="margin: 12px 0;" data-code-lang="text" data-sigil="remarkup-code-block"><pre class="remarkup-code" style="font: 11px/15px "Menlo", "Consolas", "Monaco", monospace; padding: 12px; margin: 0; background: rgba(71, 87, 120, 0.08);">* Smooth scrolling: Scrolling using the scroll wheel, arrow keys, PageUp/PageDown keys, or the spacebar will results in an animated transition effect rather than the view "jumping" to the new location
* Pixel scrolling: Doing a two-finger scroll gesture on a touchpad scrolls scroll pixel-by pixel proportionally with your fingers' movement, rather than the movement being interpreted as a scroll wheel and advancing the view by a fixed or user-configurable number of lines</pre></div>
<p>Originally, I was going for the first implementation, where users have the option to enable / disable the animation.<br />
I was inspired by the Mozilla Firefox UI, which allows users to toggle "smooth scrolling" in their preferences with a checkbox option.</p>
<p>Smooth scrolling seems to be a controversial feature. Some people love it, but others really hate it and don't understand why others love it.<br />
I'm one of those people who's addicted to his phone, so I've grown spoiled by mobile scrolling.<br />
On a phone, you can hold your finger on the screen and drag the text line-by-line smoothly.<br />
Okular's instant scrolling is a little hard on my eyes when I read text at different zoom levels. <br />
Sometimes I need to hit the arrow key multiple times to feed a single line of text. <br />
Sometimes one keystroke is too little, but two keystrokes is too much.</p>
<p>The patch I wrote is basic and filled with bugs.<br />
It does two things poorly (controlling step size and animating the scroll).<br />
This could possibly be solved by experimenting with the timers built into Okular, but a better approach is probably more along the lines of what you mentioned.<br />
I think the responsibility of enabling smooth scrolling should fall on the Qt widgets rather than the Okular scroll event processing functions.<br />
Qt has a QScrollBar widget. Perhaps a QSmoothScrollBar or an instance method with a boolean option to enable smooth scrolling could be added.<br />
I'm running KDE on Debian, so I don't have a system setting I can change to universally enable smooth scrolling like those on Ubuntu might.</p>
<ul class="remarkup-list">
<li class="remarkup-list-item">Step Size</li>
</ul>
<p>Changing the step size might be a nice feature to add on its own. <br />
It's simple and can be added as a configuration parameter with a default value of 20. <br />
This would allow users to fiddle with the step size so that it works comfortably at their desired zoom level.<br />
A step size of 20 may work well for 100% zoom, but what about 150%, 80%, full screen?</p>
<p>Here are some links showing demand for a smooth scrolling feature:<br />
<a href="http://okular-devel.kde.narkive.com/ZM0xtQx4/okular-bug-319870-new-add-smooth-scrolling" class="remarkup-link" target="_blank" rel="noreferrer">http://okular-devel.kde.narkive.com/ZM0xtQx4/okular-bug-319870-new-add-smooth-scrolling</a><br />
<a href="https://askubuntu.com/questions/66489/is-there-a-way-to-enable-smooth-scrolling-for-pdfs" class="remarkup-link" target="_blank" rel="noreferrer">https://askubuntu.com/questions/66489/is-there-a-way-to-enable-smooth-scrolling-for-pdfs</a></p></div></div><br /><div><strong>REPOSITORY</strong><div><div>R223 Okular</div></div></div><br /><div><strong>REVISION DETAIL</strong><div><a href="https://phabricator.kde.org/D9857" rel="noreferrer">https://phabricator.kde.org/D9857</a></div></div><br /><div><strong>To: </strong>rmacmaster, okular-devel, Okular, ngraham<br /><strong>Cc: </strong>ngraham, Okular, michaelweghorn, simgunz, aacid<br /></div>