Class ResizeTracker

  • All Implemented Interfaces:
    DragTracker, RequestConstants, Tool

    public class ResizeTracker
    extends SimpleDragTracker
    A Tracker for dragging a resize handle. The ResizeTracker will resize all of the selected editparts in the viewer which understand a RESIZE request. A ChangeBoundsRequest is sent to each member of the operation set. The tracker allows for the resize direction to be specified in the constructor.
    • Field Detail

      • MAX_FLAG

        protected static final int MAX_FLAG
        The maximum flag used by this class.
    • Constructor Detail

      • ResizeTracker

        public ResizeTracker​(int direction)
        Deprecated.
        use ResizeTracker(GraphicalEditPart, int) instead
        Constructs a resize tracker that resizes in the specified direction. The direction is specified using PositionConstants.NORTH, PositionConstants.NORTH_EAST, etc.
        Parameters:
        direction - the direction
      • ResizeTracker

        public ResizeTracker​(GraphicalEditPart owner,
                             int direction)
        Constructs a resize tracker that resizes in the specified direction. The direction is specified using PositionConstants.NORTH, PositionConstants.NORTH_EAST, etc.
        Parameters:
        owner - of the resize handle which returned this tracker
        direction - the direction
    • Method Detail

      • activate

        public void activate()
        Description copied from class: AbstractTool
        Activates the tool. Any initialization should be performed here. This method is called when a tool is selected.
        Specified by:
        activate in interface Tool
        Overrides:
        activate in class AbstractTool
        See Also:
        Tool.activate()
      • deactivate

        public void deactivate()
        Description copied from class: AbstractTool
        Deactivates the tool. This method is called whenever the user switches to another tool. Use this method to do some clean-up when the tool is switched. The abstract tool allows cursors for viewers to be changed. When the tool is deactivated it must revert to normal the cursor of the last tool it changed.
        Specified by:
        deactivate in interface Tool
        Overrides:
        deactivate in class SimpleDragTracker
        See Also:
        AbstractTool.deactivate()
      • eraseTargetFeedback

        protected void eraseTargetFeedback()
        This method is invoked when the resize operation is complete. It notifies the target to erase target feedback.
      • getCommand

        protected Command getCommand()
        Description copied from class: AbstractTool
        Returns a new, updated command based on the tool's current properties. The default implementation returns an unexecutable command. Some tools do not work commands and the model, but simply change the viewer's state in some way.
        Overrides:
        getCommand in class AbstractTool
        Returns:
        a newly obtained command
        See Also:
        AbstractTool.getCommand()
      • getCommandName

        protected java.lang.String getCommandName()
        Description copied from class: AbstractTool
        Returns the identifier of the command that is being sought. This name is also the named that will be logged in the debug view.
        Specified by:
        getCommandName in class AbstractTool
        Returns:
        the identifier for the command
        See Also:
        AbstractTool.getCommandName()
      • getOwner

        protected GraphicalEditPart getOwner()
        Returns the owner of this resize tracker.
        Since:
        3.7
      • getResizeDirection

        protected int getResizeDirection()
        Returns the direction of the resize (NORTH, EAST, NORTH_EAST, etc.). These constants are from PositionConstants.
        Returns:
        the resize direction.
      • getTargetEditPart

        protected GraphicalEditPart getTargetEditPart()
        The TargetEditPart is the parent of the EditPart being resized.
        Returns:
        The target EditPart; may be null in 2.1 applications that use the now deprecated constructor.
      • showTargetFeedback

        protected void showTargetFeedback()
        This method is invoked as the drag is happening. It notifies the target to show target feedback.
      • enforceConstraintsForResize

        protected void enforceConstraintsForResize​(ChangeBoundsRequest changeBoundsRequest)
        Ensures size constraints (by default minimum and maximum) are respected by the given request. May be overwritten by clients to enforce additional constraints.
        Parameters:
        changeBoundsRequest - The request to validate
        Since:
        3.7
      • getMaximumSizeFor

        protected org.eclipse.draw2d.geometry.Dimension getMaximumSizeFor​(ChangeBoundsRequest request)
        Determines the maximum size that the host can be resized to for a given request. By default, a default value is returned. The value is interpreted to be a dimension in the host figure's coordinate system (i.e. relative to its bounds), so it is not affected by zooming affects.
        Parameters:
        request - the ChangeBoundsRequest
        Returns:
        the minimum size
        Since:
        3.7
      • getMinimumSizeFor

        protected org.eclipse.draw2d.geometry.Dimension getMinimumSizeFor​(ChangeBoundsRequest request)
        Determines the minimum size that the specified child can be resized to.By default, a default value is returned. The value is interpreted to be a dimension in the host figure's coordinate system (i.e. relative to its bounds), so it is not affected by zooming effects.
        Parameters:
        request - the ChangeBoundsRequest
        Returns:
        the minimum size
        Since:
        3.7