Inspired by swing (LWUIT)

[focode]

i present here the source code of my program that when executed will
display four icons with two commands 1 ok 2exit

i have to show next displayble "form" upon click of "ok" soft button ,
anuone told me to use getFocus() to get the current selected image ,
but i don't know how to use it ... just help me out


import com.sun.lwuit.Command;
import com.sun.lwuit.Component;
import com.sun.lwuit.Display;
import com.sun.lwuit.Form;
import com.sun.lwuit.Image;
import com.sun.lwuit.Label;
import com.sun.lwuit.events.ActionEvent;
import com.sun.lwuit.events.ActionListener;
import com.sun.lwuit.layouts.GridLayout;
import java.io.IOException;
import javax.microedition.midlet.MIDlet;


public class ImageListner extends MIDlet implements ActionListener{
Form f1;
public void startApp() {
Display.init(this);
getForm();
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
}
public Form getForm()
{
try {

f1 = new Form("Text");

f1.setLayout(new GridLayout(2,2));
Image i1 = Image.createImage("/res/girl2-32.png");
Label l1 = new Label(i1);
l1.setText("Hello");
l1.setTextPosition(Component.BOTTOM);
l1.setAlignment(Component.CENTER);
l1.setAlignment(Component.CENTER);
l1.getStyle().setMargin(10, 10, 10, 10);
Command ok = new Command("Ok");
f1.addCommand(ok);
Command exit = new Command("Exit");
f1.addCommand(exit);
f1.addComponent(l1);

Label l2 = new Label(i1);
l2.setText("Hello");
l2.setTextPosition(Component.BOTTOM);
l2.setAlignment(Component.CENTER);
l2.setAlignment(Component.CENTER);
l2.getStyle().setMargin(10, 10, 10, 10);
f1.addComponent(l2);

Label l3 = new Label(i1);
l3.setText("Hello");
l3.setTextPosition(Component.BOTTOM);
l3.setAlignment(Component.CENTER);
l3.setAlignment(Component.CENTER);
l3.getStyle().setMargin(10, 10, 10, 10);
f1.addComponent(l3);

Label l4 = new Label(i1);
l4.setText("Hello");
l4.setTextPosition(Component.BOTTOM);
l4.setAlignment(Component.CENTER);
l4.setAlignment(Component.CENTER);
l4.getStyle().setMargin(10, 10, 10, 10);
f1.addComponent(l4);
f1.setCommandListener(this);
}
catch (IOException ex) {
ex.printStackTrace();
}
f1.show();
return f1;
}


public void actionPerformed(ActionEvent ae) {
Form current = Display.getInstance().getCurrent();
if(current == f1)
{


}

}
private Component getFocused() {
throw new UnsupportedOperationException("Not yet
implemented");
}
}

 

[guptan]

i present here the source code of my program that when executed will
display four icons with two commands 1 ok 2 exit

i have to show next displayble "form" upon click of "ok" soft button (?LSK?) ,
anuone (?SOMEONE?) told me to use getFocus() to get the current selected image ,
but i don't know how to use it ... just help me out

import com.sun.lwuit.Command;
import com.sun.lwuit.Component;
import com.sun.lwuit.Display;
import com.sun.lwuit.Form;
import com.sun.lwuit.Image;
import com.sun.lwuit.Label;
import com.sun.lwuit.events.ActionEvent;
import com.sun.lwuit.events.ActionListener;
import com.sun.lwuit.layouts.GridLayout;
import java.io.IOException;
import javax.microedition.midlet.MIDlet;

public class ImageListner extends MIDlet implements ActionListener{
    Form f1;
    public void startApp() {
         Display.init(this);
    getForm();
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
    }
    public Form getForm()
    {
        try {

////////////////////A CONTAINER

            f1 = new Form("Text");

///////////////USES A CERTAIN LAYOUT ALGORITHM

            f1.setLayout(new GridLayout(2,2));

            Image i1 = Image.createImage("/res/girl2-32.png"); /////////////COMPONENT
            Label l1 = new Label(i1);
            l1.setText("Hello");
            l1.setTextPosition(Component.BOTTOM);
            l1.setAlignment(Component.CENTER);
            l1.setAlignment(Component.CENTER);
            l1.getStyle().setMargin(10, 10, 10, 10); /////////////COMPONENT
            Command ok = new Command("Ok");
            f1.addCommand(ok); /////////////COMPONENT
            Command exit = new Command("Exit");
            f1.addCommand(exit);
            f1.addComponent(l1); /////////////COMPONENT
            l2.setText("Hello");
            l2.setTextPosition(Component.BOTTOM);
            l2.setAlignment(Component.CENTER);
            l2.setAlignment(Component.CENTER);
            l2.getStyle().setMargin(10, 10, 10, 10);
            f1.addComponent(l2); /////////////COMPONENT
            l3.setText("Hello");
            l3.setTextPosition(Component.BOTTOM);
            l3.setAlignment(Component.CENTER);
            l3.setAlignment(Component.CENTER);
            l3.getStyle().setMargin(10, 10, 10, 10);
            f1.addComponent(l3); /////////////COMPONENT
            Label l4 = new Label(i1);
            l4.setText("Hello");
            l4.setTextPosition(Component.BOTTOM);
            l4.setAlignment(Component.CENTER);
            l4.setAlignment(Component.CENTER);
            l4.getStyle().setMargin(10, 10, 10, 10);
            f1.addComponent(l4);

/////////////COMPONENT
///REGISTER A LISTENER FOR EVENTS; MESSAGES WILL COME THROUGH THE
INTERFACE

            f1.setCommandListener(this);
        }
         catch (IOException ex) {
        ex.printStackTrace();
        }

///////////////NOW SAFE TO BE RENDERED

            f1.show();
        return f1;
    }

////EVENTS WILL COME HERE AS PER THE CONTRACT
    public void actionPerformed(ActionEvent ae) {

/////////GET THE CURRENT CONTAINER

        Form current = Display.getInstance().getCurrent(); /////
        if(current == f1)
        {

        }

    }
    private Component getFocused() {
        throw new UnsupportedOperationException("Not yet
implemented");
    }

}

first you study AWT programs and test some of them, they are easily
available.
then you will understand how to use action listeners for the
components.

Don't forget to cover up the concepts and design patterns and event
sequences takes place in any UI Framework.

"
told me to use getFocus() to get the current selected image ,

but i don't know how to use it ... just help me out

"
You have formed a grid layout here. So naturally using navigation keys
one can switch from one component to another. when input focus comes
on a component rememember which one. this can be done using a
reference or an integer as you have only four components. " Where is
your commandAction();"
Implement that. for LSK add the loaded image into your currently
selected component, which is being rendered\in focus.

Hope you have got some idea.

 

[Roedy Green]

anuone told me to use getFocus() to get the current selected image ,

I am not quite sure what you are trying to do, but probably want
buttons, radio buttons, CheckBoxGroups -- things designed to be
clicked.

See http://mindprod.com/jgloss/jbutton.html
http://mindprod.com/jgloss/jcheckbox.html
--
Roedy Green Canadian Mind Products
http://mindprod.com

"I mean, source code in files; how quaint, how seventies!"
~ Kent Beck (born: 1961 age: 48), evangelist for extreme programming.