Difference between revisions of "Report API"
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==Draw document API==
==Draw document API==
==Graph document API==
==Graph document API==
Latest revision as of 00:41, 28 April 2020
The Simple Document API interface
It is a report API(Application programming interface) made for Gramps plugin/addon writers
Please update or expand this section.
In Gramps there are five different types of reports.
- Text report
- Graphical report
- Web pages
Only Text reports, Graphical reports and Graphs use the Report (Document) API, since Web reports write their output directly into files, while Book reports are simply combination of Text reports and Graphical reports.
At the moment the combination of textual and graphical elements within one document is not supported (for future plans refer to Report API redesign), thus Text and Graphical reports are implemented via separate APIs, though they have a common part. This common part is implemented in the BaseDoc class, which contains among others basic document opening, closing, and stylesheet handling methods. It also stores the physical description of a page (sheet of paper in print).
The BaseDoc.open and the BaseDoc.close methods have to be implemented by the subclassed document generators.
Description of the paper, which every report will be rendered on, is stored by an instance of the PaperStyle class. This instance is available via the BaseDoc.paper_style class attribute. The chosen PaperStyle is given to the document generator at initialization, and is handled by the reporting framework.
The PaperStyle holds information on the size of the paper (PaperSize class instance), the size of the margins, and the orientation of the paper. Use the proper accessor methods to get the values. To get the metrics of the usable area of a paper (page without the margins) one can also use the PaperStyle.get_usable_width and PaperStyle.get_usable_height convenience methods. Width and height are always given according to the orientation of the paper, thus width is always the horizontal, and height is always the vertical dimension.
Text reports do not need to care about paper properties, as the document generator (or the external viewer) paginates the report according to those properties. While, on the other hand, graphical reports do need to take paper properties into account when creating graphical elements, i.e. they should not draw on the margins.
The origin of the coordinate system is the top left corner of the usable area.
Text document API
The specification of the Textdoc API is here
The interface for adding media objects is as follows:
add_media_object(name, align, w_cm, h_cm, alt='', style_name=None, crop=None)[source] Add a photo of the specified width (in centimeters). Parameters: name – filename of the image to add align – alignment of the image. Valid values are ‘left’, ‘right’, ‘center’, and ‘single’ w_cm – width in centimeters h_cm – height in centimeters alt – an alternative text to use. Useful for eg html reports style_name – style to use for captions crop – image cropping parameters
Note that because of the structure of these documents, Images are only allowed as children (i.e. following) Document or Cell.
This interface is used in the following reports:
|Detailed Ancestral Report||Built-in||right||DDR-Caption||via gen/plug/report/utils.py|
|Detailed Descendant Report||Built-in||right||DDR-Caption||via gen/plug/report/utils.py|
|Individual Complete Report||Built-in||right||None||direct|
|Book (Title Page)||Built-in||center||None||direct|
None of the reports use 'alt'. It is understood (from looking at the code in odfdoc.py) that left and right alignment should cause the text to wrap around the media object, while for single alignment, there should be no text on either side of the media object.
Since style_name should be used as the style for the caption (i.e. the alt string) it should also be used for the image itself. Otherwise the caption would not be below the picture.
As at December 2014, output appears as follows:
|HTML||OK Picture on right, text wrapped round it||?||Picture on left margin, text not wrapped|
|RTF||Picture on left margin, text not wrapped||?||OK Picture aligned with previous paragraph, text not wrapped|
|ODF||OK Picture on right, text wrapped round it||?||Picture centred, text not wrapped|
|Picture on right, text not wrapped||?||Picture on left margin, text not wrapped|