Medical Imaging Interaction Toolkit  2018.4.99-86eb38db
Medical Imaging Interaction Toolkit
Introduction: Selection Service Concept

The selection service provided by the BlueBerry workbench allows efficient linking of different parts within the workbench window: View parts that provide additional information for particular objects and update their content automatically whenever such objects are selected somewhere in the workbench window. For example the "Properties" view in MITK applications behaves in this way: Wherever an element is selected in the workbench this view lists the properties of that element.

MitkSelectionService.png
DataNode properties

Other aspects of the workbench like the enablement of global actions may also depend on the current selection.

Each workbench window has its own selection service instance. The service keeps track of the selection in the currently active part and propagates selection changes to all registered listeners. Such selection events occur when the selection in the current part is changed or when a different part is activated. Both can be triggered by user interaction or programmatically.

SelectionServiceDiagram.png
Selection Service Diagram

What can be selected?

From the users point of view a selection is a set of highlighted entries in a viewer like a table or tree widget. A selection can also be a piece of text in an editor.

Internally a selection is a data structure holding the model objects which corresponds to the graphical elements selected in the workbench. As pointed out before there are two fundamental different kinds of selections:

  • A list of objects
  • A piece of text

BlueBerrySelectionServiceIntro_Examples

The following two examples describe different ways of implementing and using the provided selection services. One example is based on the Qt selection model, the other one is based on the MITK Data node selection.

Knowing and using the existing selection mechanisms gives your plug-ins a clean design, smoothly integrates them into the workbench and opens them for future extensions.

[Selection Service] [Next: Qt Model/View selections] [BlueBerry Examples]