https://bugs.documentfoundation.org/show_bug.cgi?id=105808
Bug ID: 105808
Summary: make the scroll bar useful for really large documents,
currently it is too sensitive for them
Product: LibreOffice
Version: 5.3.0.2 rc
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: enhancement
Priority: medium
Component: Writer
Assignee: [email protected]
Reporter: [email protected]
If you have long documents, e.g. one with more than 100 pages or even with more
than 500 pages the "elevator" gets smaller and smaller as it reflects the
proportion of the document shown on one full screen window with respect to the
whole document. Also the elevator shows the position of the current display
window with respect to the whole document.
This is well understood and it was appropriate for small documents up to say
100 pages.
For larger documents it gets worse, especially if the documents get much larger
than 100 pages. I have some with 300++ pages and even some with 500+pages. But
doing small adjustments by using the scrollbar gets annoying with those
documents.
For larger documents the rule "the length of the elevator reflects the portion
of a full height window with respect to the whole document" should be given up:
The elevator should not get smaller than 7 mm or even 10mm, so you have 3.5mm
or even 5mm up and down from its middle.
If you click on the elevator, the mouse cursor always should always initially
attach itself on the middle of the elevator to add some dynamic feature as
described below:
If you move the mouse with the (left) mouse switch pressed, the speed of
display movement should be limited to some maximum speed of say at most 5 pages
per second as long as the mouse-attached indicator is displaced from the middle
of the elevator and stays in the elevator (this maximum speed from inside the
elevator should be a configuration item). The speed should depend on the amount
of the actual displacement from the middle height of the elevator.
After this improvement has been added, you can easily shift the displayed
portion of the document by small amounts. If you leave it a bit displaced from
the middle but on the elevator and with the key pressed, the display movement
eventually will come to a halt when due to the displayed portion movement, the
elevator is centered again under the current mouse position. Of course,
scrolling should always be interrupted as soon as the mouse key is released.
Now we need some other means to control large scrolls in the document: If the
mouse-pointer is moved out of the elevator but stays still in the elevator
shaft, the elevator should switch to higher gears. It still should have a
maximum scrolling speed of say 500 pages per second (also something which
should be configured) as soon as the mouse pointer is in the elevator more than
4 cm away from the middle of the center of the elevator (the elevator then gets
attracted by a very strong spring). The scrolling speed should depend on the
displacement off the elevator. Of course, if the mouse key gets no longer
depressed, scrolling should stop immediately. If you would move the mouse
pointer (with mouse key pressed) on the scroll bar to some estimated portion of
the document ad stop it there holding the key pressed, as the elevator
approaches the mouse position, the elevator speed would continuously decrease
coming to a soft rest when the mouse pointer is centered on the middle of the
elevator again as a consequence of the elevator movement. As the elevator is
softly approaching its destination, the user can still correct the final
position by moving the mouse a bit up or down.
This improvement would make the scrolbar useful for large documents. Of course,
this proposal is not limited to LO Writer, it might be applied in the other LO
products too.
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