Chapter 3, Creating JFace Viewers

Pop quiz – understanding JFace

Q1

getImage() for showing an Image for an entry, and getText() for showing a text value of an entry.

Q2

The hasChildren() method is used to determine whether or not an element is shown with an expandable element, and getChildren() is used to calculate a list of children.

Q3

An ImageRegistry is used to share images between plug-ins or different views in plug-ins, with a means of clearing up the resources when the view is disposed.

Q4

Entries can be styled with an IStyledLabelProvider.

Pop quiz – understanding sorting and filters

Q1

Specifying a ViewerComparator can allow elements to be sorted in a different order other than the default one.

Q2

The select() method is used to filter elements, which is originally derived from the Smalltalk terminology.

Q3

Multiple filters can be combined by setting an array of filters, or by writing a filter to combine two or more filters together.

Pop quiz – understanding properties

Q1

Add a DoubleClickListener to the view.

Q2

The Dialog subclasses are used to create a dialog with custom content.

Q3

Property descriptors are used to represent keys for properties on a particular object.

Q4

Properties are displayed on a Properties view by having an object that is adaptable (either directly through the IAdaptable interface, or indirectly via the IAdapterManager) such that it returns a property source instance, which will return the property descriptors.

Pop quiz – understanding tables

Q1

To get the headers shown, get the Table from the Viewer, and use it to call the setHeaderVisible(true) method.

Q2

TableViewerColumns are used to set properties on individual columns and to bind the label provider for the columns.

Q3

Synchronization is achieved by registering the site as a selection provider (so that the selection events are sent to the workbench) and to listen for incoming selection events and adjusting the view as necessary. Care must be taken to avoid recursive selection calls in this case.

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