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Useful APIs defined by ILabelProvider include:
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getImage(Object)
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- Returns the image for the label of the given
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getText(Object)
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- Returns the text for the label of the given
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List-oriented Viewers
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Figure 5-2
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Label Provider Hierarchy
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Useful APIs defined by ITableLabelProvider include:
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getColumnImage(Object, int)
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- Returns the label image for the
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getColumnText(Object, int)
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- Returns the label text for the
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TT 5 JFace Viewers
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Table Label Provider Hierarchy
See Section 516 for an example of label providers
512 Content Providers A content provider is another of the most common adapter types that are used in list viewers A content provider is used to map between a domain model object or a collection of domain model objects used as the input to the viewer and the internal list structure needed by the viewer itself The two most common types of content providers are IStructuredContentProvider used in lists and tables and ITreeContentProvider used in trees (see Figure 54) The former maps a domain model input into an array while the latter adds support for retrieving an item's parent or children within a tree A content provider is associated with a viewer using the setContentProvider() method A domain model input is associated with a viewer using the setInput() method
List-oriented Viewers
Figure 5-4
Content Provider Hierarchy
Useful APIs defined by IStructuredContentProvider include:
getElements (Object)
- Returns the elements to display in the
viewer when its input is set to the given element
inputChanged(Viewer, Object, Object)
- Notifies this content
provider that the given viewer's input has been switched to a different element
Useful APIs added by ITreeContentProvider include:
Object[] getChildren(Object)
- Returns the child elements of
the given parent element The difference between this
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method and the getElements(Object) method listed above is that getElements(Object) is called to obtain the tree viewer's root elements, whereas getChildren(Object) is used to obtain the children of a given parent element in the tree (including a root)
getParent(Object)
- Returns the parent for the given element, or
null indicating that the parent can't be computed
hasChildren(Object)
- Returns whether the given element has
children
See Section 516 for an example of content providers
513 Viewer Sorters A viewer sorter (see Figure 5-5 for the ViewerSorter hierarchy) is used to sort the elements provided by the content provider (see Figure 5-1) If a viewer does not have a viewer sorter, the elements are shown in the order returned
List-oriented Viewers
by the content provider A viewer sorter is associated with a viewer using the
setSorter()
method
The default sorting algorithm uses a two-step process First, it groups elements into categories (ranked 0 through n), and second it sorts each category based on the text labels returned by the label provider By default, all items are in the same category, so all of the items are sorted relative to their text labels Your application can override the default categorization as well as the default comparison routine to use some criteria other than the item s text label
Figure 5-5
Viewer Sorter Hierarchy
Useful APIs defined by ViewerSorter include:
category(Object)
- Returns the category of the given element - Returns a negative, zero, or
compare(Viewer, Object, Object)
positive number depending on whether the first element is
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less than, equal to, or greater than the second element
getCollator()
- Returns the collator used to sort strings - Returns whether this viewer
isSorterProperty(Object, String)
sorter would be affected by a change to the given property of the given element
sort(Viewer viewer, Object[])
- Sorts the given elements in-
place, modifying the given array
See Section 516 for an example of viewer sorters
514 Viewer Filters 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 51) If a view does not have a viewer filter all of the elements are displayed A viewer filter is associated with a viewer using the setFilter() method
List-oriented Viewers
Figure 5-6
Viewer Filter Hierarchy
Useful APIs defined by ViewFilter are listed below Simple viewer filters need only override the select(Viewer,
Object, Object)
method to de-
termine whether or not an object should be visible in the viewer
filter(Viewer, Object, Object[])
- Filters the given elements
for the given viewer The default implementation of this method calls the select(Viewer, listed below
isFilterProperty(Object, String) Object, Object)
method
- 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
element makes it through this filter
TT 5 JFace Viewers
515 StructuredViewer The StructuredViewer class is the abstract superclass of list viewers, table viewers and tree viewers (see Figure 5-7)
Figure 5-7
Structured Viewer Hierarchy
It defines a large number of useful APIs that are common to each class
addDoubleClickListener(IDoubleClickListener)
- Adds a listener
for double-clicks in this viewer
addDragSupport(int, Transfer[], DragSourceListener)
- Adds
support for dragging items out of this viewer via a user drag-and-drop operation
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 re-
quests 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
TT 5 JFace Viewers
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 refil-
tering 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 - The StructuredViewer
setContentProvider(IContentProvider)
implementation 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
List-oriented Viewers
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
setSelection(ISelection, boolean)
- The StructuredViewer im-