Kerning

See also

Notifications:
The Kerning object uses notifications to notify observers of changes.

Tasks

Parent

Kerning

class defcon.Kerning

This object contains all of the kerning pairs in a font.

This object posts the following notifications:

Name Note
Kerning.Changed Posted when the dirty attribute is set.

This object behaves like a dict. For example, to get a list of all kerning pairs:

pairs = kerning.keys()

To get all pairs including the values:

for (left, right), value in kerning.items():

To get the value for a particular pair:

value = kerning["a", "b"]

To set the value for a particular pair:

kerning["a", "b"] = 100

And so on.

Note: This object is not very smart in the way it handles zero values, exceptions, etc. This may change in the future.

addObserver(observer, methodName, notification)

Add an observer to this object’s notification dispatcher.

  • observer An object that can be referenced with weakref.
  • methodName A string epresenting the method to be called when the notification is posted.
  • notification The notification that the observer should be notified of.

The method that will be called as a result of the action must accept a single notification argument. This will be a defcon.tools.notifications.Notification object.

This is a convenience method that does the same thing as:

dispatcher = anObject.dispatcher
dispatcher.addObserver(observer=observer, methodName=methodName,
    notification=notification, observable=anObject)
dirty

The dirty state of the object. True if the object has been changed. False if not. Setting this to True will cause the base changed notification to be posted. The object will automatically maintain this attribute and update it as you change the object.

disableNotifications(notification=None, observer=None)

Disable this object’s notifications until told to resume them.

  • notification The specific notification to disable. This is optional. If no notification is given, all notifications will be disabled.

This is a convenience method that does the same thing as:

dispatcher = anObject.dispatcher
dispatcher.disableNotifications(
    observable=anObject, notification=notification, observer=observer)
dispatcher

The defcon.tools.notifications.NotificationCenter assigned to this object.

enableNotifications(notification=None, observer=None)

Enable this object’s notifications.

  • notification The specific notification to enable. This is optional.

This is a convenience method that does the same thing as:

dispatcher = anObject.dispatcher
dispatcher.enableNotifications(
    observable=anObject, notification=notification, observer=observer)
getParent()

Get the parent. Returns None if no parent is set. Note that because the reference to the parent is stored as a weakref, the parent can disappear if it is no longer referenced by any object other than this one.

hasObserver(observer, notification)

Returns a boolean indicating is the observer is registered for notification.

This is a convenience method that does the same thing as:

dispatcher = anObject.dispatcher
dispatcher.hasObserver(observer=observer,
    notification=notification, observable=anObject)
holdNotifications(notification=None)

Hold this object’s notifications until told to release them.

  • notification The specific notification to hold. This is optional. If no notification is given, all notifications will be held.

This is a convenience method that does the same thing as:

dispatcher = anObject.dispatcher
dispatcher.holdNotifications(
    observable=anObject, notification=notification)
releaseHeldNotifications(notification=None)

Release this object’s held notifications.

  • notification The specific notification to hold. This is optional.

This is a convenience method that does the same thing as:

dispatcher = anObject.dispatcher
dispatcher.releaseHeldNotifications(
    observable=anObject, notification=notification)
removeObserver(observer, notification)

Remove an observer from this object’s notification dispatcher.

  • observer A registered object.
  • notification The notification that the observer was registered to be notified of.

This is a convenience method that does the same thing as:

dispatcher = anObject.dispatcher
dispatcher.removeObserver(observer=observer,
    notification=notification, observable=anObject)
setParent(obj)

Set the parent of the object. This will reference the parent using weakref.

undoManager

The undo manager assigned to this object.