org.eclipse.draw2d
Interface LayoutListener

All Known Implementing Classes:

LayoutAnimator, LayoutListener.Stub

public interface LayoutListener

Classes which implement this interface provide callback hooks for various layout related events.

Instances can be hooked to figures by calling IFigure.addLayoutListener(LayoutListener). Listeners will be made aware of various steps of the layout mechanism, and even have the opportunity to prevent normal layout from occurring.

Since:

3.1

Nested Class Summary

static class

LayoutListener.Stub A stub implementation which implements all of the declared methods.

Method Summary

void	invalidate(IFigure container) Called when a container has been invalidated.
boolean	layout(IFigure container) Called prior to layout occurring.
void	postLayout(IFigure container) Called after layout has occurred.
void	remove(IFigure child) Called when a child is about to be removed from its parent.
void	setConstraint(IFigure child, Object constraint) Called when a child's constraint is initialized or updated.

Method Detail

invalidate

void invalidate(IFigure container)

Called when a container has been invalidated.

Parameters:

container - the invalidated Figure

Since:

3.1

layout

boolean layout(IFigure container)

Called prior to layout occurring. A listener may intercept a layout by returning true. If the layout is intercepted, the container's LayoutManager will not receive a layout call.

Parameters:

container - the figure incurring a layout

Returns:

true if the layout has been intercepted by the listener

Since:

3.1

postLayout

void postLayout(IFigure container)

Called after layout has occurred.

Parameters:

container - the figure incurring a layout

Since:

3.1

remove

void remove(IFigure child)

Called when a child is about to be removed from its parent.

Parameters:

child - the child being removed

Since:

3.1

setConstraint

void setConstraint(IFigure child,
                   Object constraint)

Called when a child's constraint is initialized or updated.

Parameters:

child - the child being updated

constraint - the child's new constraint

Since:

3.1