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→Modifying Abacus
Abacus is under GPL license. You are free to use it and learn with it. You are also encouraged to modify it to suit your needs or just for a further opportunity to learn.
Abacus is under GPL license. You are free to use it and learn with it. You are also encouraged to modify it to suit your needs or just for a further opportunity to learn.
Most changes can be confined to two modules: <code>abacus.py</code> and <code>abacus_window.py</code>. The former defines the menu to work from the Gnome desktop; the latter defines what code is executed by each type of abacus.
Most changes can be confined to three modules: <code>AbacusActivity.py</code>, <code>abacus.py</code> and <code>abacus_window.py</code>. The former define the Sugar and GNOME toolbars; the latter defines what code is executed by each type of abacus.
For instance, to add a menu item such as 'Reset' you would do the following in <code>abacus.py</code>:
For instance, to add a menu item such as 'Reset' you would do the following in <code>abacus.py</code>:
* Add these lines to the menu items list:
menu_items = gtk.MenuItem(_("Reset"))
menu_items = gtk.MenuItem(_("Reset"))
menu.append(menu_items)
menu.append(menu_items)
menu_items.connect("activate", self._reset)
menu_items.connect("activate", self._reset)
* The _reset() method is trivial:
def _reset(self, event, data=None):
def _reset(self, event, data=None):
""" Reset """
""" Reset """
self.abacus.mode.reset_abacus()
self.abacus.mode.reset_abacus()
This will complete the changes in the <code>abacus.py</code>. The method <code>reset_abacus()</code> will have to be defined for each abacus in the <code>abacus_window.py</code>. This can be done by creating that method in the <code>AbacusGeneric</code> class used by all the varieties of abacus. The method may have to be overridden in some abacus subclasses for customization reasons. For instance, <code>reset_abacus()</code> was defined in <code>AbacusGeneric</code> class and then overridden in <code>Schety</code>.
Similarly, you can add another button to the Sugar toolbar in <code>AbacusActivity.py</code>:
* Add these lines to the toolbar block:
# Reset the beads on the abacus to the initial cleared position
self.reset_button = ToolButton( "reset" )
self.reset_button.set_tooltip(_('Reset'))
self.reset_button.props.sensitive = True
self.reset_button.connect('clicked', self._reset_button_cb)
toolbar_box.toolbar.insert(self.reset_button, -1)
self.reset_button.show()
* The _reset_button_cb() method is trivial:
def _reset_button_cb(self, event, data=None):
""" Reset the beads on the abacus to the initial cleared position """
self.abacus.mode.reset_abacus()
* You'll have to create an icon for the button (<code>reset.svg</code>) and put it into the <code>icon</code> subdirectory of the bundle.
This will complete the changes in the <code>abacus.py</code>. The method <code>reset_abacus()</code> will have to be defined for each abacus in the <code>abacus_window.py</code>. This can be done by creating that method in the <code>AbacusGeneric</code> class used by all the varieties of abacus. The method may have to be overridden in some abacus subclasses for customization reasons. For instance, <code>reset_abacus()</code> was defined in <code>AbacusGeneric</code> class and then overridden in <code>Schety</code>.
If the changes involve modifying the graphics, then other methods may need to be modified as well. For instance, in order to introduce a reset button that can be clicked to reset the bead positions to the beginning, the following methods had to be modified – all in <code>abacus_window.py</code>:
If the changes involve modifying the graphics, then other methods may need to be modified as well. For instance, in order to introduce a reset button that can be clicked to reset the bead positions to the beginning, the following methods had to be modified – all in <code>abacus_window.py</code>: