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Bug 417393

Summary:	Scroll event handling
Product:	[Eclipse Project] Platform	Reporter:	Christoph Cantillon <christoph.cantillon>
Component:	SWT	Assignee:	Platform-SWT-Inbox <platform-swt-inbox>
Status:	RESOLVED WORKSFORME	QA Contact:
Severity:	normal
Priority:	P3	CC:	christoph.cantillon, ericwill
Version:	4.3	Keywords:	triaged
Target Milestone:	---
Hardware:	PC
OS:	Linux
Whiteboard:

Description Christoph Cantillon

2013-09-17 03:27:47 EDT

I'm running Eclipse 4.3.0 on Ubuntu 12.04 and I'm using a Logitech Performance MX. This mouse can generate scroll events very quickly thanks to its notchless flywheel scrollwheel. What I notice when scrolling through code in Eclipse is that when I flick the wheel and stop it, Eclipse continues scrolling for some time after stopping it.
This seems to me as if Eclipse queues each scroll event and renders a frame for each event, even if the scroll events are arriving faster than Eclipse can render the editor. A much better solution would be to aggregate similar scrolling events into a single event while the editor is still rendering, and then render just once so no backlog is created and scrolling stops almost immediately after stopping the scroll wheel.

Comment 1 Christoph Cantillon

2013-09-17 05:03:12 EDT

Forgot to mention: this only happens in text editors. The Console e.g. stops scrolling correctly.

Comment 2 Eric Williams

2018-05-11 14:11:09 EDT

I cannot reproduce this issue on Fedora 28, 4.8 M7, and GTK3.22. Please re-open this ticket if the bug persists.