Sugar scroll bar clicks should invoke page up/page down and not relocate the scroll cursor

[greenfeld]

In GNOME- and KDE-style applications (such as Xchat, Firefox, Konqueror, etc.) clicking the vertical scroll bar away from where the the scroll location indicator is results in a page up or page down-style action depending on if the click is above or below the indicator.

In Sugar clicking anywhere the scrollbar is not relocates the scrollable item so that the indicator is moved to the clicked position.

Personally I find this confusing. If one clicks on the scrollbar in Read in a 100+ page document, you can end up far away from where you were, and figuring out how to get back to where you were in an epub book can take a significant amount of time.

In all cases clicking & dragging the scroll indicator relocates it to a desired position.

Seen in 13.1.0 os1.

[tonyforster]

added milestone 0.98 so it will come up in searches for that

[tonyforster]

Still present in OS3, in Browse the cursor is relocated, in Write it advances one page

[erikos]

@gary I think a question for you if we want to change that behavior

[erikos]

(marking normal as not a regression)

[garycmartin]

Replying to erikos:

@gary I think a question for you if we want to change that behavior

Yes we should revert to the old paging behaviour. FWIW with the new behaviour you loose all context of where you were so a scroll bar click is not easily recovered from (in an ebook or pdf you are effectively lost).

[erikos]

Sounds like a regression.

[humitos]

It seems like the buttons are inverted. If you right-click on the scrollbar you get the page up/down. I tested this on Read and Browse on sugar-build.

[humitos]

This property (gtk-primary-button-warps-slider) has changed between gtk2 and Gtk3:

• Gtk3 -> default TRUE
  •  http://developer.gnome.org/gtk3/stable/GtkSettings.html#GtkSettings--gtk-primary-button-warps-slider

• gtk2 -> default FALSE
  •  http://developer.gnome.org/gtk/2.24/GtkSettings.html#GtkSettings--gtk-primary-button-warps-slider

I tried to set it up when the Activity starts but it says that property does not exist.

>>> from gi.repository import Gtk
>>> settings = Gtk.Settings.get_default()
>>> settings.get_property('gtk-primary-button-warps-slider')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: object of type `GtkSettings' does not have property `gtk-primary-button-warps-slider'
>>>

[humitos]

This patch only work in a newer version of Gtk3 (since 3.6) - It works on XO-4 13.1.0 build 8

[humitos]

Patch for Sugar itself. It's for the Journal

[erikos]

Fixed in  http://git.sugarlabs.org/sugar-artwork/mainline/commit/a138cf04714a3e871d6ca9ff07c91f399d0f8b15

0.97.9

[greenfeld]

Clicking in scrollbars is now much closer to a page-up/page-down action (although not an exact equivalent) in Sugar 0.98.2/OLPC 13.1.0 os20.