Package org.eclipse.jface.viewers

Provides a framework for viewers, which are model-based content adapters for SWT widgets.

See:
Description

Interface Summary

IBaseLabelProvider	A label provider maps an element of the viewer's model to an optional image and optional text string used to display the element in the viewer's control.
IBasicPropertyConstants	Predefined property names used for elements displayed in viewers.
ICellEditorListener	A listener which is notified of significant events in the life of a cell editor.
ICellEditorValidator	An interface for validating a cell editor's input.
ICellModifier	A cell modifier is used to access the data model from a cell editor in an abstract way.
ICheckable	Interface for objects that support elements with a checked state.
ICheckStateListener	A listener which is notified of changes to the checked state of items in checkbox viewers.
IContentProvider	A content provider mediates between the viewer's model and the viewer itself.
IDoubleClickListener	A listener which is notified of double-click events on viewers.
IInputProvider	Interface common to all objects that provide an input.
IInputSelectionProvider	Interface common to all objects that provide both an input and a selection.
ILabelDecorator	A label decorator decorates the label text and image for some element.
ILabelProvider	Extends IBaseLabelProvider with the methods to provide the text and/or image for the label of a given element.
ILabelProviderListener	A listener which is notified when a label provider's state changes.
IOpenListener	A listener which is notified of open events on viewers.
ISelection	Interface for a selection.
ISelectionChangedListener	A listener which is notified when a viewer's selection changes.
ISelectionProvider	Interface common to all objects that provide a selection.
IStructuredContentProvider	An interface to content providers for structured viewers.
IStructuredSelection	A selection containing elements.
ITableLabelProvider	Extends IBaseLabelProvider with the methods to provide the text and/or image for each column of a given element.
ITreeContentProvider	An interface to content providers for tree-structure-oriented viewers.
ITreeViewerListener	A listener which is notified when a tree viewer expands or collapses a node.

Class Summary

AbstractTreeViewer	Abstract base implementation for tree-structure-oriented viewers (trees and table trees).
CellEditor	Abstract base class for cell editors.
CellEditor.LayoutData	Struct-like layout data for cell editors, with reasonable defaults for all fields.
CheckboxCellEditor	A cell editor that manages a checkbox.
CheckboxTableViewer	A concrete viewer based on an SWT Table control with checkboxes on each node.
CheckboxTreeViewer	A concrete tree-structured viewer based on an SWT Tree control with checkboxes on each node.
CheckStateChangedEvent	Event object describing a change to the checked state of a viewer element.
ColorCellEditor	A cell editor that manages a color field.
ColumnLayoutData	An abstract column layout data describing the information needed (by TableLayout) to properly lay out a table.
ColumnPixelData	Describes the width of a table column in pixels, and whether the column is resizable.
ColumnWeightData	Describes the width of a table column in terms of a weight, a minimum width, and whether the column is resizable.
ComboBoxCellEditor	A cell editor that presents a list of items in a combo box.
ContentViewer	A content viewer is a model-based adapter on a widget which accesses its model by means of a content provider and a label provider.
DecoratingLabelProvider	A decorating label provider is a label provider which combines a nested label provider and an optional decorator.
DialogCellEditor	An abstract cell editor that uses a dialog.
DoubleClickEvent	Event object describing a double-click.
LabelProvider	A label provider implementation which, by default, uses an element's toString value for its text and null for its image.
LabelProviderChangedEvent	Event object describing a label provider state change.
ListViewer	A concrete viewer based on an SWT List control.
OpenEvent	Event object describing an open which may be generated from a selection or default selection event.
SelectionChangedEvent	Event object describing a selection change.
StructuredSelection	A concrete implementation of the IStructuredSelection interface, suitable for instantiating or subclassing.
StructuredViewer	Abstract base implementation for structure-oriented viewers (trees, lists, tables).
TableLayout	A layout for a table.
TableTreeViewer	A concrete viewer based on a SWT TableTree control.
TableViewer	A concrete viewer based on a SWT Table control.
TextCellEditor	A cell editor that manages a text entry field.
TreeExpansionEvent	Event object describing a tree node being expanded or collapsed.
TreeViewer	A concrete viewer based on an SWT Tree control.
Viewer	A viewer is a model-based adapter on a widget.
ViewerDropAdapter	This adapter class provides generic drag-and-drop support for a viewer.
ViewerFilter	A viewer filter is used by a structured viewer to extract a subset of elements provided by its content provider.
ViewerSorter	A viewer sorter is used by a structured viewer to reorder the elements provided by its content provider.

Package org.eclipse.jface.viewers Description

Provides a framework for viewers, which are model-based content adapters for SWT widgets.

Package Specification

A viewer is a model-based adapter on an SWT widget. Each viewer has four parts:

an input - the object that serves as the viewer's model

a widget - the SWT control through which the viewer's model is displayed

a content provider - mediates between the model and viewer

a label provider - maps model objects to displayable labels containing text and/or an image

This package contains the viewer framework. The viewer framework is an independent JFace module. Using it requires a knowledge of SWT, but does not require familiarity with any of the other JFace modules. The framework consists of abstract base classes for viewers (Viewer, StructuredViewer, AbstractTreeViewer) together with concrete viewer classes (ListViewer, TreeViewer, TableViewer, TableTreeViewer, CheckboxTreeViewer, and CheckboxTableViewer), and various lesser support classes. The concrete structured viewer classes are ready-to-use and have built-in support for drag-and-drop, filtering (IViewerFilter and ViewerFilter), and sorting (IViewerSorter and ViewerSorter); these classes may also be subclassed further if required.

In general terms, creating a viewer involves the following steps:

• instantiating a viewer on some pre-existing SWT widget,
• setting the viewer's content provider (an object implementing IContentProvider),
• setting the viewer's label provider (an object implementing ILabelProvider),
• and, finally, setting the viewer's input.

Once a viewer's input is set, the viewer becomes active. As the model changes, it is the content provider's responsibility to respond to changes to the model by telling the viewer what to change (done by calling add and remove methods on the viewer). An existing viewer may be retargeted by giving it a different object as input; the viewer is responsible for informing the content provider of these kinds of wholesale changes (IContentProvider.inputChanged). Also, each viewer registers with its label provider for notification of changes that would affect what the viewer displays (see ILabelProviderListener.stateChanged).

Note: None of the classes in this package maintain global state.