Overview of stage 2
The second part of the tutorial, the Sample2.java
file, see <installdir> /jviews-framework810/codefragments/getstart/index.html,
is an extension of the Sample1
file. Compile the Sample2.java file
and run it as you did for Sample1.
See Running
the example.
In this step, you add interaction to the
view by placing a selection interactor on it. To do this, add a
Select button and associate it with the interactor. When you
click the Select button, the selection interactor is placed on
the view and you can select the graphic objects in the view (in
this case, part of the person's face), move them around, and
modify their shape.
A selection interactor is an instance of the class IlvSelectInteractor, a subclass of the IlvManagerViewInteractor class. This view interactor will process all the input
events, such as mouse and keyboard events, occurring in a manager
view.
Adding the selectInteractor field
To be able to use the class IlvSelectInteractor, first import the Rogue
Wave® JViews packages that contain the interactors, servlets and
events:
import ilog.views.interactor.*; import ilog.views.util.servlet.event.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener;
Then add the
selectInteractor
and
button
instance variables into
Sample2
.
public class Sample2 extends JFrame { IlvManager manager; IlvManagerView mgrview; IlvSelectInteractor selectInteractor; JButton button; .... }
Creating the Select button
The following code creates a Select button and associates it with
the
selectInteractor
:
void createButtons() { JButton button; button = new JButton("Select"); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { if (selectInteractor == null) selectInteractor = new IlvSelectInteractor(); if (mgrview.getInteractor() != selectInteractor) mgrview.setInteractor(selectInteractor); } }); getContentPane().add(button, BorderLayout.SOUTH); }
When you click the Select button, the
actionPerformed
method first creates its interactor (if this has not already been
done), then it installs the interactor on this view using the setInteractor method. Once the interactor
is installed, you can select, move, and modify the graphics
objects displayed in the view.