Quote:
Originally Posted by eschwartz
Double-click will open the book for reading.
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Only if
Preferences->Tweaks-># Control behavior of the book list is set to
open_viewer (default) - I have it set to
do_nothing
Quote:
ID: doubleclick_on_library_view
You can control the behavior of doubleclicks on the books list.
Choices: open_viewer, do_nothing, edit_cell, edit_metadata. Selecting anything other than open_viewer has the side effect of disabling editing a field using a single click.
Default: open_viewer.
Example: doubleclick_on_library_view = 'do_nothing'
You can also control whether the book list scrolls horizontal per column or per pixel. Default is per column.
# Control behavior of the book list
doubleclick_on_library_view = 'do_nothing'
horizontal_scrolling_per_column = True
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There is no setting that will try to add a book that's already added
Quote:
Originally Posted by eschwartz
Depending on the viewer configuration, calibre may want to open certain book formats using the OS default, instead of specifically passing it to the ebook-viewer.app; when the OS is configured to open certain filetypes  with calibre GUI, you end up (re-)adding the book. |
Whether a given format is opened in the ebook-viewer program from the library manager (calibre.exe) is controlled by the ticks in the
Preferences->Behaviour->Use Internal viewer for: list.
However if an association has been set for TPZ in OS/X that references calibre.exe then that would probably cause calibre to try to add the book again. But I very doubt calibre itself would have established such an association.
BR