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Revision as of 05:57, 26 April 2010
This page describes the technical details of Gramplets. If you are interested in using Gramplets, please see Gramps 3.2 Wiki Manual - Gramplets.
A Gramplet is a type of GRAMPS plugin. A Gramplet is a mini-view that is designed to be composed with other Gramplets or Views to create a way to see your Family Tree that is just right for you. In fact, Gramplets can be made to do just about anything that you want. There are 6 main kinds of plugins:
- Reports: output for printing or display
- Tools: a method for processing data
- Quick View: a list of details based on the current object
- Importer: reads a file into your current tree
- Exporter: writes a file from your current tree
- Gramplets: interactive views for moving, analysing, displaying, etc.
There are two plugin directories: a global/system one, and a private/personal one. You can easily create a plugin by simply putting a file in your personal plugin directory (usually in .gramps/grampsxx/plugins).
In teaching programming, a common "first program" is to write a program that says "Hello World". Let's jump right in and take a look at such a gramplet named HelloWorld.py:
def init(gui): gui.set_text("Hello world!")
Then an other python file named HelloWorld.gpr.py
register(GRAMPLET, id="Hello World Gramplet", name=_("Hello World Gramplet"), description = _("a program that says 'Hello World'"), status = STABLE, version="0.0.1", fname="HelloWorld.py", height = 20, gramplet = 'init', gramps_target_version="3.2", gramplet_title=_("Sample Gramplet") )
If you copy this files into a file in your plugins directory, and then either restart GRAMPS or go to Help -> Plugin Status -> Reload, the you'll be able to create this Gramplet. On the Gramplet View, right-click in an open area and select the "Hello World Gramplet". You should then see:
The main work of a Gramplet is performed in a function, or a class. In this very simple example, a function init is defined that takes a single argument, gui. The function simply sets the gui's text area to be "Hello World!", and that's it. It does this just once, and never changes.
Before a plugin can be used, it needs to be "registered". You call the register function with a number of named-arguments. There are a number of named-arguments that you can provide, including: name, height, content, title, expand, state, and data. We will explore those in detail, below.
Hello World, with Class
Here is the same functionality again, but this time as a class:
class HelloWorldGramplet(Gramplet): def init(self): self.set_text("Hello world!")
register(GRAMPLET, id="Hello World2 Gramplet", name=_("Hello World2 Gramplet"), description = _("a program that says 'Hello World'"), version="0.0.1", gramps_target_version="3.2", status = STABLE, fname="HelloWorld2.py", height = 20, gramplet = 'HelloWorld2Gramplet', gramps_target_version="3.2", gramplet_title=_("Sample Gramplet") )
This is the recommended method of creating a Gramplet. The following details describe the properties and methods of this class.
- id: the case-insensitive keyword "gramplet"
- name: the gramplet's name (can be translated), unique among gramplets
- height: the minimum or maximum height of the gramplet in normal mode
- fname: the name of your file
- title: the default gramplet title; user changeable
- status: STABLE or UNSTABLE
- version: a string with 2 dots (such as "1.23.14") representing the version number
- gramps_target_version: a string with 2 dots representing the version of GRAMPS that this gramplet was written for
At the bare minimum, you need to have the above 8 options when registering your Gramplets.
In addition, you can use the following as well:
- detached_width: the size in pixels of the minimum and default detached height
- detached_height: the size in pixels of the minimum and default detached height
- expand: whether or not the Gramplet should expand to fill the column, if it can
- init(): run once, on construction
- main(): run once per update
- update(): don't change this, it calls main
- active_changed(): run when active-changed is triggered
- db_changed(): run when db-changed is triggered
- set_tooltip(TEXT) - tooltip for gramplet
Don't call main directly; use the update method.
In the db_changed method, you should connect all of the signals that will trigger an update. That typically looks like:
def db_changed(self): self.dbstate.db.connect('person-add', self.update) self.dbstate.db.connect('person-delete', self.update) self.dbstate.db.connect('person-update', self.update) self.dbstate.db.connect('family-add', self.update) self.dbstate.db.connect('family-delete', self.update) self.dbstate.db.connect('family-update', self.update)
The method main() can be written as a normal Python method, or it can be written to run nicely in parallel with other GRAMPS code. To make it run nicely in parallel, you should issue a yield True every once in a while. For example:
def main(self): for i in range(5000): if i % 500 == 0: yield True yield False
The True means that there is more to do; False means that there is nothing left to do.
Textual Output Methods
The most common kinds of Gramplets are text-based. There are a number of methods to assist with handling this text.
- set_text(TEXT) - clear and set text to TEXT
- append_text(TEXT, scroll_to=POSITION)
- POSITION is 'begin' (top), 'end' (bottom) or 'start' (start of append)
- clear_text() - clears all text
- render_text(TEXT) - for use with A, B, I, U, and TT tags
- A for creating links; use tag HREF="url" for URLs, and WIKI="name" for pages on the wiki
- B for bold
- I for italics
- U for underlined
- TT for a fixed-width, typewriter font
- link(TEXT, LINK-TYPE, DATA) -
- TEXT can be any text
- LINK-TYPE is:
- 'Person' - and DATA is a person handle
- 'PersonList' - and DATA is a list of handles
- 'Family' - and DATA is a family handle
- 'Surname' - and DATA is a person
- 'Given' -
- 'Filter' - and DATA is either:
- 'all people' -
- 'males' - all males
- 'females' - all females
- 'people with unknown gender' - people marked as unknown
- 'people with incomplete names' - people who have a missing surname or given name
- 'people with missing birth dates' - people who have missing birth dates
- 'disconnected people' - people with no parents and no children
- 'all families' - all families
- 'unique surnames' - list of all unique surnames
- 'people with media' - people who have media
- 'media references' - all of the media
- 'unique media' -
- 'missing media' - media for which the file does not exist
- 'media by size' -
- 'list of people'-
- 'URL' - and DATA is a URL
- 'WIKI' - and DATA is a wiki page
- 'Attribute' - and DATA is an attribute (eg, 'Nickname')
- no_wrap() - turn word wrap off DEPRECATED
- set_wrap(BOOL) - change word wrap
Tags are the manner in which you format the text.
tag = self.gui.buffer.create_tag("fixed") tag.set_property("font", "Courier 8") ... start, end = self.gui.buffer.get_bounds() self.gui.buffer.apply_tag_by_name("fixed", start, end) self.append_text("", scroll_to="begin")
Occasionally, you might have to dive down to the graphical objects that compose a Gramplet.
If you wanted to put an arbitrary gtk object into the main area of a Gramplet, then you need to replace the standard textview object with your own. Here is the basic structure:
from gettext import gettext as _ from DataViews import Gramplet, register import gtk class WidgetGramplet(Gramplet): def init(self): self.gui.WIDGET = gtk.WIDGET() self.gui.get_container_widget().remove(self.gui.textview) self.gui.get_container_widget().add_with_viewport(self.gui.WIDGET) self.gui.WIDGET.show() register(type="gramplet", name= "Widget Gramplet", tname=_("Widget Gramplet"), height=100, expand=False, content = WidgetGramplet, title=_("Widget"), )
In fact, with Python, gtk, and cairo, you can make your own widgets that do pretty much anything and look very nice. Here is an example adding a Cairo Clock (which really keeps time) to GRAMPS: ClockGramplet.addon.tgz
Here it is on the Gramplet view:
- OPTION is one of the menu options:
- see src/gen/plug/menu/ for others
- OPTION is one of the menu options:
There are a number of preset properties:
- dbstate.db.connect(SIGNAL, METHOD)
- force_update: set True to have the gramplet update, even when minimized
To learn more about writing a Gramplet, it is suggested to look at the existing Gramplets. You can see a complete list of the Gramplet source code here:
Click on a filename, and then "(view)" to see the source code of that Gramplet.