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Bug 215817

Summary:

Gallery: how to implement pagewise keyboard scrolling

Product:

z_Archived

Reporter:

Robert Handschmann <robert.handschmann>

Component:

Nebula

Assignee:

Nicolas Richeton <nicolas.richeton>

Status:

CLOSED FIXED

QA Contact:

Severity:

minor

Priority:

Keywords:

plan

Version:

unspecified

Target Milestone:

---

Hardware:

OS:

Windows XP

Whiteboard:

Attachments:

Description	Flags
Changed classes based on a nightly build from 18.1.2008	nicolas.richeton: iplog+
mylyn/context/zip	none
mylyn/context/zip	none

Description Robert Handschmann

2008-01-18 10:26:39 EST

I would like to implement a KeyListener on a Gallery for scrolling by page using the keys SWT.PAGE_DOWN and SWT.PAGE_UP.
How can I determine the last completely visible gallery item of the page? Or better: the first item of the last completely visible row?

Comment 1 Peter Centgraf

2008-01-18 13:13:39 EST

I'd love to see this feature myself.  I don't think there is a high-level method for exactly what you want, but it won't be hard to write.  Look at Gallery.getVisibleItems(Rectangle) for inspiration.

Also, keep in mind that the scroll bar scale is exact pixels.  If all you want to do is move the scroll bar by one page, you could manipulate the scroll bar directly.  If you want to move the selection (which is probably a better idea), find the current selection and iterate over the items until you find one at the appropriate distance.

Comment 2 Robert Handschmann

2008-01-21 12:39:28 EST

I implemented the keys HOME, END, PAGE_UP and PAGE_DOWN. I tested it in my application that uses the NoGroupRenderer.
The changed classes are attached.

Comment 3 Robert Handschmann

2008-01-21 12:40:39 EST

Created attachment 87419 [details]
Changed classes based on a nightly build from 18.1.2008

Comment 4 Nicolas Richeton

2008-11-02 13:24:45 EST

Ok, I've applied the patch. It works great but with several groups (DefaultGroupRenderer), we cannot reach the top or the bottom of the gallery using only PageUp and PageDown. 
This has yet to be fixed.

Robert : Thanks for the patch.

Comment 5 Nicolas Richeton

2008-11-02 13:24:48 EST

Created attachment 116729 [details]
mylyn/context/zip

Comment 6 Nicolas Richeton

2009-04-17 09:00:57 EDT

Fixed the remaining issues with DefaultGroupRenderer. 
CVS > 20090417.

Comment 7 Nicolas Richeton

2009-04-17 09:01:01 EDT

Created attachment 132232 [details]
mylyn/context/zip

Comment 8 Nicolas Richeton

2009-06-17 06:21:50 EDT

Closing this bug