org.eclipse.nebula.widgets.nattable.layer.event

Class StructuralChangeEventHelper

java.lang.Object

org.eclipse.nebula.widgets.nattable.layer.event.StructuralChangeEventHelper

public class StructuralChangeEventHelper
extends Object

Helper class providing support for modifying cached index lists for IStructuralChangeEvents.

Author:

Dirk Fauth

Constructor Summary

Constructors

Constructor and Description
StructuralChangeEventHelper()

Method Summary

Methods

Modifier and Type	Method and Description
static void	handleRowDelete(Collection<StructuralDiff> rowDiffs, ILayer underlyingLayer, Collection<Integer> cachedRowIndexes, boolean handleNotFound) Will check for events that indicate that a rows has been deleted.
static void	handleRowInsert(Collection<StructuralDiff> rowDiffs, ILayer underlyingLayer, Collection<Integer> cachedRowIndexes, boolean addToCache) Will check for events that indicate that a rows are added.

Methods inherited from class java.lang.Object

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

Constructor Detail

StructuralChangeEventHelper

public StructuralChangeEventHelper()

Method Detail

handleRowDelete

public static void handleRowDelete(Collection<StructuralDiff> rowDiffs,
                   ILayer underlyingLayer,
                   Collection<Integer> cachedRowIndexes,
                   boolean handleNotFound)

Will check for events that indicate that a rows has been deleted. In that case the given cached indexes for the given layer need to be updated because the index of the rows might have changed. E.g. Row with index 3 is hidden in the given layer, deleting row at index 1 will cause the row at index 3 to be moved at index 2. Without transforming the index regarding the delete event, the wrong row would be hidden.

Parameters:

rowDiffs - The collection of StructuralDiffs to handle

underlyingLayer - The underlying layer of the layer who caches the indexes. Needed to translate the transported row positions to indexes, because the conversion to the layer who caches the index is done before it is fired further in the layer stack

cachedRowIndexes - The collection of indexes that is cached by the layer that needs transformation

handleNotFound - flag to tell whether the not found row indexes should be taken into account or not. Needed for last row checks

handleRowInsert

public static void handleRowInsert(Collection<StructuralDiff> rowDiffs,
                   ILayer underlyingLayer,
                   Collection<Integer> cachedRowIndexes,
                   boolean addToCache)

Will check for events that indicate that a rows are added. In that case the given cached indexes need to be updated because the index of the rows might have changed. E.g. Row with index 3 is hidden in the given layer, adding a row at index 1 will cause the row at index 3 to be moved to index 4. Without transforming the index regarding the add event, the wrong row would be hidden.

Parameters:

rowDiffs - The collection of StructuralDiffs to handle

underlyingLayer - The underlying layer of the layer who caches the indexes. Needed to translate the transported row positions to indexes, because the conversion to the layer who caches the index is done before it is fired further in the layer stack

cachedRowIndexes - The collection of indexes that is cached by the layer that needs transformation

addToCache - Flag to configure if the added value should be added to the cache or not. This is necessary to differ whether cachedRowIndexes are a collection of all indexes that need to be updated (e.g. row reordering) or just a collection of indexes that are applied for a specific state (e.g. row hide state)