Class FocusTraverseManager

java.lang.Object
org.eclipse.draw2d.FocusTraverseManager

public class FocusTraverseManager extends Object
This class is a helper to the SWTEventDispatcher. It handles the task of determining which Figure will gain focus upon a tab/shift-tab. It also keeps track of the Figure with current focus.

Note: When a Canvas with a LightweightSystem gains focus, it gives focus to the child Figure who had focus when this Canvas lost focus. If the canvas is gaining focus for the first time, focus is given to its first child Figure.

  • Constructor Details

    • FocusTraverseManager

      public FocusTraverseManager()
      Default constructor.
  • Method Details

    • getNextFocusableFigure

      public IFigure getNextFocusableFigure(IFigure root, IFigure prevFocus)
      Returns the IFigure that will receive focus upon a 'tab' traverse event.
      Parameters:
      root - the LightweightSystem's root figure
      prevFocus - the IFigure who currently owns focus
      Returns:
      the next focusable figure
    • getPreviousFocusableFigure

      public IFigure getPreviousFocusableFigure(IFigure root, IFigure prevFocus)
      Returns the IFigure that will receive focus upon a 'shift-tab' traverse event.
      Parameters:
      root - The LightweightSystem's root figure
      prevFocus - The IFigure who currently owns focus
      Returns:
      the previous focusable figure
    • getCurrentFocusOwner

      public IFigure getCurrentFocusOwner()
      Returns:
      the figure that currently has focus
    • setCurrentFocusOwner

      public void setCurrentFocusOwner(IFigure fig)
      Sets the currently focused figure.
      Parameters:
      fig - the figure to get focus