Package org.eclipse.ui.forms.widgets

Class LayoutCache

java.lang.Object

org.eclipse.ui.forms.widgets.LayoutCache

public class LayoutCache
extends Object

Caches the preferred sizes of an array of controls

Since:

3.0

Constructor Summary

Constructors

Constructor	Description
LayoutCache()	Creates an empty layout cache
LayoutCache(Control[] controls)	Creates a cache for the given array of controls

Method Summary

Modifier and Type	Method	Description
Point	computeSize(int controlIndex, int widthHint, int heightHint)	Computes the preferred size of the nth control
void	flush()	Flushes the cache.
void	flush(int controlIndex)	Flushes the cache for the given control.
SizeCache	getCache(int idx)	Returns the size cache for the given control
void	setControls(Control[] controls)	Sets the controls that are being cached here.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

LayoutCache

public LayoutCache()

Creates an empty layout cache

LayoutCache

public LayoutCache(Control[] controls)

Creates a cache for the given array of controls

Parameters:

controls - controls to cache

Method Details

getCache

public SizeCache getCache(int idx)

Returns the size cache for the given control

Parameters:

idx - control's index

Returns:

the size cache for the given control

setControls

public void setControls(Control[] controls)

Sets the controls that are being cached here. If these are the same controls that were used last time, this method does nothing. Otherwise, the cache is flushed and a new cache is created for the new controls.

Parameters:

controls - new controls to cache

computeSize

public Point computeSize(int controlIndex,
 int widthHint,
 int heightHint)

Computes the preferred size of the nth control

Parameters:

controlIndex - index of the control whose size will be computed

widthHint - width of the control (or SWT.DEFAULT if unknown)

heightHint - height of the control (or SWT.DEFAULT if unknown)

Returns:

the preferred size of the control

flush

public void flush(int controlIndex)

Flushes the cache for the given control. This should be called if exactly one of the controls has changed but the remaining controls remain unmodified

Parameters:

controlIndex - index of control to flush

flush

public void flush()

Flushes the cache.