Component

See also

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

Tasks

Reference Data

Hit Testing

Changed State

Parent

Component

class defcon.Component

This object represents a reference to another glyph.

This object posts the following notifications:

Name Note
Component.Changed Posted when the dirty attribute is set.
Component.BaseGlyphChanged Posted when the baseGlyph attribute is set.
bounds

The bounds of the components’s outline expressed as a tuple of form (xMin, yMin, xMax, yMax).

controlPointBounds

The control bounds of all points in the components. This only measures the point positions, it does not measure curves. So, curves without points at the extrema will not be properly measured.

baseGlyph

The glyph that the components references. Setting this will post Component.BaseGlyphChanged and Component.Changed notifications.

transformation

The transformation matrix for the component. Setting this will posts a Component.Changed notification.

draw(pen)

Draw the component with pen.

drawPoints(pointPen)

Draw the component with pointPen.

move((x, y))

Move the component by (x, y).

This posts a Component.Changed notification.

pointInside((x, y), evenOdd=False)

Returns a boolean indicating if (x, y) is in the “black” area of the component.

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.