John Scipione 6761bf581f BListView: Update selection on mouse down and mouse up
A version of this feature was originally implemented in hrev50495
that allowed you to scroll through a list of list items while the
mouse was held down updating the selection as you went.

This feature was removed when we switched to selecting on mouse up
in hrev52062 and was never reimplimented when we switched back to
selecting on mouse down in hrev52121.

In BeOS R5 as you scrolled through a single-selection list with the
mouse button held down the selected item appeared to change, but
the selection didn't actually update until you released the mouse
button. The selection never changes on mouse down, only on mouse
up. You could click on one item then move your mouse off the first
item to a second item releasing your mouse button and it would
select the second item without ever selecting the first item.

In this commit we replicate this behavior with one exception, we
always select on mouse down, but still allow the selection to
change on mouse up.

The big difference between this and the BeOS behavior is that on
BeOS you could only select exactly one item on mouse up, while with
this you can select one item on mouse down and a second item on
mouse up.

ScrollToSelection() in MouseMoved() if mouse button is down and
we are not not dragging. This performs auto-scroll.

Create private _DoSelection() method copied from MouseDown().
Remove Thread.h include that is no longer used.

Fixes #15009 (and doesn't cause regression for #9190 #14264 #14289)

Change-Id: Icae02b8d37ed281390647504b4efa3d694ea522a
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1956
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Reviewed-by: John Scipione <jscipione@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
2023-12-05 22:10:10 +00:00
2023-12-02 08:19:09 +00:00
2018-01-04 00:04:02 -06:00
2021-06-13 21:06:58 +00:00

Haiku

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Haiku is an open-source operating system that specifically targets personal computing. Inspired by the BeOS, Haiku is fast, simple to use, easy to learn and yet very powerful.

Goals

  • Sensible defaults with minimal configuration required.
  • Clean, clear, concise code.
  • Unified desktop environment.

Trying Haiku

Haiku provides pre-built nightly images and release images. Haiku is compatible with a large variety of hardware, but in case you don't want to "take the plunge" and install Haiku on bare metal, you can install it on a virtual machine (VM) instead. If you've never used a VM before, you can follow one of the "Emulating Haiku" guides.

Compiling Haiku

See ReadMe.Compiling.

Contributing

Haiku is a meritocratic open source project with a large variety of tasks. Even if you can't write code, you can still help! Haiku needs designers, (technical) writers, translators, testers... Get involved and help out!

Contributing code

If you're submitting a patch to us, please make sure you're following the patch submitting guidelines.

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Contributing documentation

The main piece of documentation that still needs work are the API docs (found in the tree at docs/user). Just find an undocumented class, write documentation for it, and submit a patch.

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Contributing software ports

See HaikuPorts.

Contributing to our infrastructure

See Infrastructure.

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The Haiku operating system
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