| Author: | Asko Soukka |
|---|---|
| Date-Created: | 2003-09-03 |
| Last-Modified: | 2003-09-08 |
| Revision: | 1.8 |
| Status: | Implemented |
| Scope: | Minor |
| Type: | Interface |
This PEG prososes a new Alph scrollblock type: ImageScrollBlock. ImageScrollBlock would be the interface for Alph scrollblocks containing only a single image.
Currently our FenPDF application supports importing only PDF and PS files. This PEG arose from the need of importing also plain images.
Own scrollblock type for images is needed because handling images differ from handling any of the current scrollblock types. Therefore imagescrollblocks must be able to distinguish from other scrollblocks and they need their own type.
Aren't current interfaces enough?
RESOLVED: The currently existing scrollblock interfaces are PageScrollBlock and TextScrollBlock, both extending the basic ScrollBlock interface. TextScrollBlock is meant for text and PageScrollBlock for PDF and PS documents.
scrollblocks containing single images should be handled separately from both the text scrollblocks and PDF/PS document scrollblocks. Therefore, they need their own scrollblock interface.
What spesific methods should the new interface provide?
RESOLVED: None for now. The interface is currently needed only to separate ImageScrollBlocks from other ScrollBlocks. New ImageScrollBlock spesific methods could be pegged later, if found necessary.
Create the new interface org.nongnu.alph.ImageScrollBlock with no method.
Change SimpleImageScroll to implement the new interface. No changes into SimpleImageScroll's code is needed, since the interface doesn't present any new methods.