hi Dmitrijs ;) On Fri, Jun 4, 2010 at 18:44, Dmitrijs Ledkovs <dmitrij.led...@ubuntu.com>wrote:
> Open up a very large PDF document (or webpage) e.g. emacs 600 page long pdf > [1] > > User asked to: > 1) Scroll to half way. > 2) Scroll to view next three paragraphs at the bottom of the page. > > Accelerate mouse-wheel: > 1) fast scroll wheel action > 2) slow scroll wheel action > > Touch UI: > 1) rapid flick with a finger > 2) gentle slide with a finger > > Keyboard: > 1) page down, hold > 2) arrow key > > So far so good. > > But what about regular notebooks with synaptic touchpads? or using > just a mouse pointer? > > on a touchpad: two finger scrolling is slow (can't easy scroll large > chunks of the document) > mouse pointer: drag the scrollbar or have to click repeatedly the > arrow button at the top/bottom of the scrollbars > > Both of these are IMHO frustrating. Is there a solution to this problem? > > Examples: > > Docks (various implementation). if you have loads of icons they are > simply small and fill the whole width, but you generally have a > magnification of a few icons around the one your are currently > hovering over. This way you quickly get your mouse-pointer to the area > of interest (eg. middle of the doc) that section gets magnified and > you can move your cursor to precisely select the desired near-by icon. > > Two scrollbars (full & current section): e.g. [2] here you have two > timelines top is moths, bottom one is days and the dead centre is the > current date. If you drag bottom one you get the "precission" scroll, > and if you drag top one you get "rapid" scroll. > > Here is an idea [3] for using orthogonal axis to define "precission" > scroll: > * click and drag downwards/upwards -> rapid scroll > * click, hold drag to the left off-the scrollbar, drag up-down -> > precission scroll > > really using the orthogonal axis to define acceleration as in mouse-wheel. > > Are there any other ideas? Have any of them been implemented? > Personally want a Gtk implementation =) > > Now with this continious rendering problem there is another issue of > "jumping scroobar" which can be observed on Google Reader. This one is > related to delayed loading / rendering. > > By default google reader loads a dozen of articles as you scroll down > it loads more articles and your scrollbar jumps upwards since the > whole document became larger. In this case the expected behaviour is > reverse, by default precission scroll is required, with visual > indication of where-abouts you are in the global document length and > ability to switch to rapid scrolling (which is not useful at all in > dynamically loadable documents). No clue how to fix this one. > > [1] http://www.gnu.org/software/emacs/manual/emacs.pdf > [2] http://www.suse.de/~coolo/opensuse_11.3/ > [3] http://www.halfbakery.com/idea/Variable_20Rate_20Scroll_20Bar > > ps. Hope this is appropriate for ayatana discussion. > I'm loving these Yeah, actually i would enjoy seeing slow and fast gestures interpreted so that the mouse can evoke certain items or events while accellerating towards them (notifications, conversations etc)
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