MobileRead Forums - Using image in plugin code

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Jellby

03-09-2014 11:02 AM

Using image in plugin code

In the Prince PDF plugin I use two small images in the "about" dialog (second screnshot in that thread). However, I just noticed it doesn't work. In fact, the images are not read from the plugin file, but from the current directory, so I only see the images if I launch calibre from the directory where I'm developing the plugin (that's why I thought it worked before).

What I want is using the images in HTML code, which currently looks something like this:

Code:

<p style="margin:1em 0 0 0"><img src=":images/prince_icon.png"/> <i>Prince is copyrighted &copy; YesLogic Pty. Ltd.</i></p>

<p style="margin:0"><img src=":images/small_icon.png"/> This plugin is released under GPL v3.</p>

Is there some other way to write the src attribute such that it reads the images from the plugin file?

kovidgoyal

03-09-2014 01:09 PM

In what context are you using this HTML file? Just extract the images into a temp directory and use absolute paths to them, that way it will always work.

Jellby

03-09-2014 02:06 PM

It's just the text for the "about" or "help" dialog (inside the plugin). I simply define a variable with the HTML code:

Code:

help_txt = _('''

<h3 style="text-align:center">The Prince PDF Plugin</h3>

<p style="text-align:center"><i>Created by Jellby</i></p>

...

<p style="margin:1em 0 0 0"><i><img src=":images/prince_icon.png"/> Prince is copyrighted &copy; YesLogic Pty. Ltd.</i></p>

<p style="margin:0"><img src=":images/small_icon.png"/> This plugin is released under GPL v3.</p>

''')

and then show it with.

Code:

QMessageBox.about(self, _('About the Prince PDF Plugin'), help_txt)

How can I portably extract files to a temp dir inside the calibre framework?

kovidgoyal

03-09-2014 11:34 PM

Code:

from calibre.ptempfile import TemporaryDirectory



with TemporaryDirectory('xxx') as tdir:

   for x in ('one.jpg', 'two.jpg'):

      with open(os.path.join(tdir, x) as f:

         f.write(get_resources('images/' + x))

    about.exec_()

It is important to note that you should exec your dialog inside the outermost with block as the temp dir will be deleted when you exit the with block.

Jellby

03-10-2014 05:01 PM

Quote:

Originally Posted by kovidgoyal (Post 2783182)

Code:

from calibre.ptempfile import TemporaryDirectory



with TemporaryDirectory('xxx') as tdir:

   for x in ('one.jpg', 'two.jpg'):

      with open(os.path.join(tdir, x) as f:

         f.write(get_resources('images/' + x))

    about.exec_()

Thanks, make that:

Code:

with open(os.path.join(tdir, x),'w') as f:

;)

A minor, probably trivial question: How can I access the "version" defined in __init__ (or "name", or "author"...) from elsewhere inside the plugin code?

kovidgoyal

03-11-2014 12:11 AM

from calibre_plugins.<plugin_name> import version

Jellby

03-11-2014 03:48 PM

That works for __copyright__, which is defined outside the class, but not for version, which is inside:

Code:

from __future__ import (unicode_literals, division, absolute_import, print_function)



__license__   = 'GPL v3'

__copyright__ = '2014, Jellby <jellby@yahoo.com>'

__docformat__ = 'restructuredtext en'



from calibre.customize import InterfaceActionBase



load_translations()



class PrincePDFPlugin(InterfaceActionBase):

    name                    = _('Prince PDF')

    description             = _('Converts to PDF using the Prince software (third-party)')

    supported_platforms     = ['linux', 'windows']

    author                  = 'Jellby'

    version                 = (1, 1, 3)

    minimum_calibre_version = (1, 16, 0)

    actual_plugin           = 'calibre_plugins.prince_pdf.ui:InterfacePlugin'



...

(ImportError: cannot import name version)

I must be doing something wrong.

kovidgoyal

03-11-2014 11:56 PM

So either define version outside the class like this

version = xxx

class MyClass:

version = version

or import the class

from calibre_plugins.plugin_name import MyClass

version = MyClass.version

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