jdk.awt.event.HierarchyEvent
An event which indicates a change to the Component hierarchy to which Component belongs.
Hierarchy Change Events (HierarchyListener)
addition of an ancestor
removal of an ancestor
hierarchy made displayable
hierarchy made undisplayable
hierarchy shown on the screen (both visible and displayable)
hierarchy hidden on the screen (either invisible or undisplayable)
Ancestor Reshape Events (HierarchyBoundsListener)
an ancestor was resized
an ancestor was moved
Hierarchy events are provided for notification purposes ONLY. The AWT will automatically handle changes to the hierarchy internally so that GUI layout and displayability works properly regardless of whether a program is receiving these events or not.
This event is generated by a Container object (such as a Panel) when the Container is added, removed, moved, or resized, and passed down the hierarchy. It is also generated by a Component object when that object's addNotify, removeNotify, show, or hide method is called. The ANCESTOR_MOVED and ANCESTOR_RESIZED events are dispatched to every HierarchyBoundsListener or HierarchyBoundsAdapter object which registered to receive such events using the Component's addHierarchyBoundsListener method. (HierarchyBoundsAdapter objects implement the HierarchyBoundsListener interface.) The HIERARCHY_CHANGED events are dispatched to every HierarchyListener object which registered to receive such events using the Component's addHierarchyListener method. Each such listener object gets this HierarchyEvent when the event occurs.
An unspecified behavior will be caused if the id parameter of any particular HierarchyEvent instance is not in the range from HIERARCHY_FIRST to HIERARCHY_LAST.
The changeFlags parameter of any HierarchyEvent instance takes one of the following values:
HierarchyEvent.PARENT_CHANGED HierarchyEvent.DISPLAYABILITY_CHANGED HierarchyEvent.SHOWING_CHANGED
Assigning the value different from listed above will cause unspecified behavior.
An event which indicates a change to the Component
hierarchy to which Component belongs.
Hierarchy Change Events (HierarchyListener)
addition of an ancestor
removal of an ancestor
hierarchy made displayable
hierarchy made undisplayable
hierarchy shown on the screen (both visible and displayable)
hierarchy hidden on the screen (either invisible or undisplayable)
Ancestor Reshape Events (HierarchyBoundsListener)
an ancestor was resized
an ancestor was moved
Hierarchy events are provided for notification purposes ONLY.
The AWT will automatically handle changes to the hierarchy internally so
that GUI layout and displayability works properly regardless of whether a
program is receiving these events or not.
This event is generated by a Container object (such as a Panel) when the
Container is added, removed, moved, or resized, and passed down the
hierarchy. It is also generated by a Component object when that object's
addNotify, removeNotify, show, or
hide method is called. The ANCESTOR_MOVED and
ANCESTOR_RESIZED
events are dispatched to every HierarchyBoundsListener or
HierarchyBoundsAdapter object which registered to receive
such events using the Component's addHierarchyBoundsListener
method. (HierarchyBoundsAdapter objects implement the
HierarchyBoundsListener interface.) The HIERARCHY_CHANGED events are
dispatched to every HierarchyListener object which registered
to receive such events using the Component's addHierarchyListener
method. Each such listener object gets this HierarchyEvent
when the event occurs.
An unspecified behavior will be caused if the id parameter
of any particular HierarchyEvent instance is not
in the range from HIERARCHY_FIRST to HIERARCHY_LAST.
The changeFlags parameter of any HierarchyEvent instance takes one of the following
values:
HierarchyEvent.PARENT_CHANGED
HierarchyEvent.DISPLAYABILITY_CHANGED
HierarchyEvent.SHOWING_CHANGED
Assigning the value different from listed above will cause unspecified behavior.*-ancestor-movedclj
Static Constant.
The event id indicating an ancestor-Container was moved.
type: int
Static Constant. The event id indicating an ancestor-Container was moved. type: int
*-ancestor-resizedclj
Static Constant.
The event id indicating an ancestor-Container was resized.
type: int
Static Constant. The event id indicating an ancestor-Container was resized. type: int
*-displayability-changedclj
Static Constant.
A change flag indicates that the HIERARCHY_CHANGED event was generated due to the changing of the hierarchy displayability. To discern the current displayability of the hierarchy, call the Component.isDisplayable method. Displayability changes occur in response to explicit or implicit calls of the Component.addNotify and Component.removeNotify methods.
type: int
Static Constant. A change flag indicates that the HIERARCHY_CHANGED event was generated due to the changing of the hierarchy displayability. To discern the current displayability of the hierarchy, call the Component.isDisplayable method. Displayability changes occur in response to explicit or implicit calls of the Component.addNotify and Component.removeNotify methods. type: int
*-hierarchy-changedclj
Static Constant.
The event id indicating that modification was made to the entire hierarchy tree.
type: int
Static Constant. The event id indicating that modification was made to the entire hierarchy tree. type: int
*-hierarchy-firstclj
Static Constant.
Marks the first integer id for the range of hierarchy event ids.
type: int
Static Constant. Marks the first integer id for the range of hierarchy event ids. type: int
*-hierarchy-lastclj
Static Constant.
Marks the last integer id for the range of ancestor event ids.
type: int
Static Constant. Marks the last integer id for the range of ancestor event ids. type: int
*-parent-changedclj
Static Constant.
A change flag indicates that the HIERARCHY_CHANGED event was generated by a reparenting operation.
type: int
Static Constant. A change flag indicates that the HIERARCHY_CHANGED event was generated by a reparenting operation. type: int
*-showing-changedclj
Static Constant.
A change flag indicates that the HIERARCHY_CHANGED event was generated due to the changing of the hierarchy showing state. To discern the current showing state of the hierarchy, call the Component.isShowing method. Showing state changes occur when either the displayability or visibility of the hierarchy occurs. Visibility changes occur in response to explicit or implicit calls of the Component.show and Component.hide methods.
type: int
Static Constant. A change flag indicates that the HIERARCHY_CHANGED event was generated due to the changing of the hierarchy showing state. To discern the current showing state of the hierarchy, call the Component.isShowing method. Showing state changes occur when either the displayability or visibility of the hierarchy occurs. Visibility changes occur in response to explicit or implicit calls of the Component.show and Component.hide methods. type: int
->hierarchy-eventclj
(->hierarchy-event source id changed changed-parent)(->hierarchy-event source id changed changed-parent change-flags)Constructor.
Constructs an HierarchyEvent object to identify a change in the Component hierarchy. This method throws an IllegalArgumentException if source is null.
source - The Component object that originated the event - java.awt.Component
id - An integer indicating the type of event. For information on allowable values, see the class description for HierarchyEvent - int
changed - The Component at the top of the hierarchy which was changed - java.awt.Component
changed-parent - The parent of the changed component. This may be the parent before or after the change, depending on the type of change - java.awt.Container
change-flags - A bitmask which indicates the type(s) of the HIERARCHY_CHANGED events represented in this event object. For information on allowable values, see the class description for HierarchyEvent - long
throws: java.lang.IllegalArgumentException - if source is null
Constructor. Constructs an HierarchyEvent object to identify a change in the Component hierarchy. This method throws an IllegalArgumentException if source is null. source - The Component object that originated the event - `java.awt.Component` id - An integer indicating the type of event. For information on allowable values, see the class description for HierarchyEvent - `int` changed - The Component at the top of the hierarchy which was changed - `java.awt.Component` changed-parent - The parent of the changed component. This may be the parent before or after the change, depending on the type of change - `java.awt.Container` change-flags - A bitmask which indicates the type(s) of the HIERARCHY_CHANGED events represented in this event object. For information on allowable values, see the class description for HierarchyEvent - `long` throws: java.lang.IllegalArgumentException - if source is null
get-change-flagsclj
(get-change-flags this)Returns a bitmask which indicates the type(s) of HIERARCHY_CHANGED events represented in this event object. The bits have been bitwise-ored together.
returns: the bitmask, or 0 if this is not an HIERARCHY_CHANGED
event - long
Returns a bitmask which indicates the type(s) of HIERARCHY_CHANGED events represented in this event object. The bits have been bitwise-ored together. returns: the bitmask, or 0 if this is not an HIERARCHY_CHANGED event - `long`
get-changedclj
(get-changed this)Returns the Component at the top of the hierarchy which was changed.
returns: the changed Component - java.awt.Component
Returns the Component at the top of the hierarchy which was changed. returns: the changed Component - `java.awt.Component`
get-changed-parentclj
(get-changed-parent this)Returns the parent of the Component returned by getChanged(). For a HIERARCHY_CHANGED event where the change was of type PARENT_CHANGED via a call to Container.add, the parent returned is the parent after the add operation. For a HIERARCHY_CHANGED event where the change was of type PARENT_CHANGED via a call to Container.remove, the parent returned is the parent before the remove operation. For all other events and types, the parent returned is the parent during the operation.
returns: the parent of the changed Component - java.awt.Container
Returns the parent of the Component returned by getChanged(). For a HIERARCHY_CHANGED event where the change was of type PARENT_CHANGED via a call to Container.add, the parent returned is the parent after the add operation. For a HIERARCHY_CHANGED event where the change was of type PARENT_CHANGED via a call to Container.remove, the parent returned is the parent before the remove operation. For all other events and types, the parent returned is the parent during the operation. returns: the parent of the changed Component - `java.awt.Container`
get-componentclj
(get-component this)Returns the originator of the event.
returns: the Component object that originated
the event, or null if the object is not a
Component. - java.awt.Component
Returns the originator of the event. returns: the Component object that originated the event, or null if the object is not a Component. - `java.awt.Component`
param-stringclj
(param-string this)Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.
returns: a string identifying the event and its attributes - java.lang.String
Returns a parameter string identifying this event. This method is useful for event-logging and for debugging. returns: a string identifying the event and its attributes - `java.lang.String`
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