Viewer filters in Java

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514 Viewer filters
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A viewer filter (see Figure 5 6 for the ViewerFilter hierarchy) is used to display a subset of the elements provided by the content provider (see Figure 5 1) If a view does not have a viewer filter, all the elements are displayed A viewer filter is associated with a viewer using the setFilter() method
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JFace Viewers
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Figure 5 6
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ViewerFilter hierarchy
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Useful APIs defined by ViewFilter are listed next Simple viewer filters need only to override the select(Viewer, Object, Object) method to determine whether an object should be visible in the viewer
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filter(Viewer, Object, Object[]) Filters the given elements for the given viewer The default implementation of this method calls the following select(Viewer, Object, Object) method isFilterProperty(Object, String) Returns whether this viewer filter would be affected by a change to the given property of the given element The default implementation of this method returns false select(Viewer, Object, Object) Returns whether the given ele-
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ment makes it through this filter
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515 StructuredViewer class
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The StructuredViewer class is the abstract superclass of list viewers, table viewers, and tree viewers (see Figure 5 7)
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Figure 5 7 StructuredViewer hierarchy
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It defines a large number of useful APIs that are common to each class
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addDoubleClickListener(IDoubleClickListener) Adds a lis-
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tener for double-clicks in this viewer
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addDragSupport(int, Transfer[], DragSourceListener) Adds
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support for dragging items out of this viewer via a user drag-and-drop operation
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51 List-Oriented Viewers
addDropSupport(int, Transfer[], DropTargetListener) Adds
support for dropping items into this viewer via a user drag-and-drop operation
addFilter(ViewerFilter) Adds the given filter to this viewer and triggers refiltering and resorting of the elements addHelpListener(HelpListener) Adds a listener for help requests
in this viewer
addOpenListener(IOpenListener) Adds a listener for selection
open in this viewer
addSelectionChangedListener(ISelectionChangedListener)
Adds a listener for selection changes in this selection provider
addPostSelectionChangedListener(ISelectionChangedListener) Adds a listener for post-selection in this viewer getSelection() The StructuredViewer implementation of this method returns the result as an IStructuredSelection refresh() Refreshes this viewer completely with information freshly obtained from this viewer s model refresh(boolean) Refreshes this viewer with information freshly
obtained from this viewer s model
refresh(Object) Refreshes this viewer starting with the given element refresh(Object, boolean) Refreshes this viewer starting with the
given element
resetFilters() Discards this viewer s filters and triggers refiltering and resorting of the elements setComparer(IElementComparer) Sets the comparator to use for comparing elements, or null to use the default equals and hashCode methods on the elements themselves setContentProvider(IContentProvider) The implementation, StructuredViewer, of this method checks to ensure that the content provider is an IStructuredContentProvider setData(String, Object) Sets the value of the property with the given name to the given value, or to null if the property is to be removed setInput(Object) The ContentViewer implementation of this viewer method invokes inputChanged on the content provider and then the inputChanged hook method The content provider s getElements(Object) method is called later with this input object as its argument to determine the root-level elements in the viewer
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CHAPTER 5
JFace Viewers
setSelection(ISelection, boolean) The StructuredViewer
implementation of this method updates the current viewer selection based on the specified selection setSorter(ViewerSorter) Sets this viewer s sorter and triggers refiltering and resorting of this viewer s element setUseHashlookup(boolean) Configures whether this structured viewer uses an internal hash table to speed up the mapping between elements and SWT items update(Object[], String[]) Updates the given element s presentation when one or more of its properties changes update(Object, String[]) Updates the given element s presentation when one or more of its properties changes
516 ListViewer class
The ListViewer class wraps the List widget and is used to view a collection of objects rather than a flat collection of strings A list viewer needs to be configured with label and content providers Useful APIs include:
add(Object) Adds the given element to this list viewer add(Object[]) Adds the given elements to this list viewer getControl() Returns the primary control associated with this
viewer
getElementAt(int) Returns the element with the given index from
this list viewer
getList() Returns this list viewer s list control remove(Object) Removes the given element from this list viewer remove(Object[]) Removes the given elements from this list viewer reveal(Object) Ensures that the given element is visible, scrolling the viewer if necessary setLabelProvider(IBaseLabelProvider) The list viewer implementation of this Viewer framework method ensures that the given label provider is an instance of ILabelProvider
The Person domain model class for the next few examples looks like the following
public class Person { public String firstName = "John"; public String lastName = "Doe"; public int age = 37; public Person[] children = new Person[0]; public Person parent = null;