Package org.eclipse.jface.viewers

Class CellNavigationStrategy

java.lang.Object
org.eclipse.jface.viewers.CellNavigationStrategy
public class CellNavigationStrategy extends Object
This class implementation the strategy how the table is navigated using the keyboard.

Subclasses can implement their custom navigation algorithms

Since:
3.3

  • Constructor Details

    • CellNavigationStrategy

      public CellNavigationStrategy()

  • Method Details

    • isNavigationEvent

      public boolean isNavigationEvent(ColumnViewer viewer, Event event)
      is the given event an event which moves the selection to another cell
      Parameters:
      viewer - the viewer we are working for
      event - the key event
      Returns:
      true if a new cell is searched

    • isCollapseEvent

      public boolean isCollapseEvent(ColumnViewer viewer, ViewerCell cellToCollapse, Event event)
      Parameters:
      viewer - the viewer we are working for
      cellToCollapse - the cell to collapse
      event - the key event
      Returns:
      true if this event triggers collapsing of a node

    • isExpandEvent

      public boolean isExpandEvent(ColumnViewer viewer, ViewerCell cellToExpand, Event event)
      Parameters:
      viewer - the viewer we are working for
      cellToExpand - the cell to expand
      event - the key event
      Returns:
      true if this event triggers expanding of a node

    • expand

      public void expand(ColumnViewer viewer, ViewerCell cellToExpand, Event event)
      Parameters:
      viewer - the viewer working for
      cellToExpand - the cell the user wants to expand
      event - the event triggering the expansion

    • collapse

      public void collapse(ColumnViewer viewer, ViewerCell cellToCollapse, Event event)
      Parameters:
      viewer - the viewer working for
      cellToCollapse - the cell the user wants to collapse
      event - the event triggering the expansion

    • findSelectedCell

      public ViewerCell findSelectedCell(ColumnViewer viewer, ViewerCell currentSelectedCell, Event event)
      Parameters:
      viewer - the viewer we are working for
      currentSelectedCell - the cell currently selected
      event - the key event
      Returns:
      the cell which is highlighted next or null if the default implementation is taken. E.g. it's fairly impossible to react on PAGE_DOWN requests

    • shouldCancelEvent

      public boolean shouldCancelEvent(ColumnViewer viewer, Event event)
      This method is consulted to decide whether an event has to be canceled or not. By default events who collapse/expand tree-nodes are canceled
      Parameters:
      viewer - the viewer working for
      event - the event
      Returns:
      true if the event has to be canceled

    • init

      protected void init()
      This method is called by the framework to initialize this navigation strategy object. Subclasses may extend.