-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://git.reviewboard.kde.org/r/115413/
-----------------------------------------------------------
Review request for Okular.
Bugs: 319870
http://bugs.kde.org/show_bug.cgi?id=319870
Repository: okular
Description
-------
This implements https://bugs.kde.org/show_bug.cgi?id=319870.
This patch is largely inspired by a firefox extension, called "SmoothWheel".
This patch only affects the behaviour of mouse wheel, not the scroll bar. This
is because in order to make the scroll bar have smooth scroll feature, we need
to totally rewrite QScrollBar and QScrollArea, which is a too big task for me.
It provides following parameter to control the behavior the smooth scrolling:
1. FPS (Frames per second): control the fluency of the smooth scrolling.
2. Duration: How long does it take to finish a mouse wheel scroll.
3. SmoothMode: The function of time t and the scroll speed s: s = f(t).
Suppose t is defined at [-m, +m], and a, b, c, d are come constant:
I. CONSTANT: f(t) = c
II. LINEAR: f(t) = (m - |t|) * c
III. QUADRATIC: f(t) = a - b*t^2
IV. COSINE: f(t) = (cos(c*t) + 1)/d
a, b, c, d are determined by equation \integral_{-m}^{+m} f(t) dt = 1.
4. Acceration: Dynamic change the step size: when a user scroll his mouse
frequently, we will increase its step size so that it can enjoy a faster
scroll.
5. Big Step Modifier: When user press a modifier (by default, Alt) key and
scroll his wheel, the step size will be bigger (by default, 5 times).
6. Small Step Modifier: When user press a modifier (by default, Shift) key
and scroll his wheel, the step size will be smaller (by default, 1/5).
I hope all these settings will be exposed to the user finally. I will
implement the configuration UI after
https://git.reviewboard.kde.org/r/115335
is merged. Should I open a new configuration page since this will occupy some
space? Anyway, that should be relatively easy since all the interfaces are
implemented.
Diffs
-----
ui/qsmoothscrollarea.cpp PRE-CREATION
ui/qsmoothscrollarea.h PRE-CREATION
ui/pageview.h 9c15af6
ui/pageview.cpp 65967bf
CMakeLists.txt 63d2922
Diff: https://git.reviewboard.kde.org/r/115413/diff/
Testing
-------
Thanks,
Yichao Zhou
_______________________________________________
Okular-devel mailing list
Okular-devel@kde.org
https://mail.kde.org/mailman/listinfo/okular-devel
