[patch] UI improvements: attachments, images

[Albrecht Dreß <albrecht dress arcor de>]

Hi all,

below is a patch against today's HEAD cvs branch with several UI related  
improvements:

* remove "category" from part context popups, but keep the "select all"  
item for text. This is a repost of the patch I submitted on June 11th (see  
http://mail.gnome.org/archives/balsa-list/2004-June/msg00073.html);

* add a button to the toplevel headers box for quick attachment  
navigation. It also introduces an attachment numbering scheme like the one  
used in Mozilla. Again, this is a repost of the June 11th patch;

* improve treatment of images. Users often attach multi-MB images with  
high resolution to mails. As Balsa used to display them "as is", the  
recipient in this case will only see a fraction of the image and has to  
open it in an external application.

To improve the display, the patch first just checks if the attachment can  
be converted into a pixbuf, but just displays the "broken image" stock  
icon (part_info_init_image). When the message container gets a size- 
allocate event (on_content_size_alloc), it scans all containers for images  
(check_images_resize) and schedules the resize function using an idle  
callback. This function (img_check_size) finally adjusts large images to  
the width of the surrounding containers. Smaller images are still  
displayed "as is".

This quite complex process is necessary as the GtkViewport apparently  
doesn't pass the size-allocate event downstream when it shrinks. So if we  
just try to catch this event for every GtkImage, the image would expand if  
you enlarge the message window, but it would stay large if it shrinks.

The drawback of this method is a short delay between the initial display  
of the message and the call to the image resize function due to the nature  
of g_idle_add, though.

As always, all comments are really welcome!

Cheers,

	Albrecht.


--
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Albrecht Dreß  -  Johanna-Kirchner-Straße 13  -  D-53123 Bonn (Germany)
      Phone (+49) 228 6199571  -  mailto:albrecht dress arcor de
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