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Bug 196572

Summary:

Unify event order of MeasureItem and PaintItem events between different OS

Product:

[Eclipse Project] Platform

Reporter:

Michael Chervil <michael.krkoska>

Component:

SWT

Assignee:

Silenio Quarti <Silenio_Quarti>

Status:

CLOSED WONTFIX

QA Contact:

Severity:

enhancement

Priority:

CC:

ericwill, markus.kell.r, snorthov, tom.schindl

Version:

3.3

Keywords:

triaged

Target Milestone:

---

Hardware:

OS:

Linux-GTK

Whiteboard:

Attachments:

Description	Flags
Snippet to show the situation	none
Output of snippet on win32, carbon and gtk	none

Description Michael Chervil

2007-07-15 10:45:52 EDT

The order of MeasureItem and PaintItem events differs depending on the OS.

The attached Snippet shows the situation. I attached the output for win32, carbon and gtk.

When using owner draw on Table or Tree, sometimes the need arises to cache the results from MeasureItem to reuse it in PaintItem. A primitive caching strategy could assume, that the next event after a MeasureItem event is the corresponding PaintItem event. This is the case with win32 and carbon, but unfortunately not in gtk.

Is it possible to unify the order of the events, or is it determined by the WS?

Comment 1 Michael Chervil

2007-07-15 10:46:26 EDT

Created attachment 73810 [details]
Snippet to show the situation

Comment 2 Michael Chervil

2007-07-15 10:47:19 EDT

Created attachment 73811 [details]
Output of snippet on win32, carbon and gtk

Comment 3 Steve Northover

2007-07-19 12:39:22 EDT

There might be something we can do but the operating system determines when the events are sent.

Comment 4 Eric Williams

2018-09-10 13:54:56 EDT

Ultimately this is up to the OS, and trying to fix this will likely break things.