Display PDF in external viewer

[fadden]

When a PDF file is encountered, usually in a ZIP archive that collects a disk image and documentation together, the file viewer currently dumps the raw file as converted text. It should instead offer the conversion option "Host Image", and put a "view with external program" button in the middle of the display tab. When clicked, the default system viewer is launched, with the PDF in a temp file.

The original CiderPress automatically launched an external viewer for GIF/JPEG with no prompting. I don't think automatically launching the viewer is a good idea, because it would be jarring if you were scrolling through things with the prev/next button, but it might make sense to pop it open if the PDF file were double-clicked (i.e. the viewer is opened with a single item selected).

Update: this would also be useful for files on CD-ROM, e.g. the Opus ][ documentation directory. These have HFS file types; on the Opus ][ disc I see:

• PDF/CARO: PDF files
• W8BN/MSWD: Word files
• RTF/MSWD: RTF files; could be displayed directly in the Rich Text control, but probably better to launch a viewer since they might use fancy formatting or be very large

[fadden]

Feature is available in https://github.com/fadden/CiderPress2/releases/tag/v1.0.1-dev1

[fadden]

Available in v1.0.1.