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Java Discussion Thread
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Views: 1555

Feb 17th, 2007

Passing control

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yay this first time that I develop something larger

My problem: main method display a frame with buttons where you choose what function/action you want to perform. Once you press a button I want the main window become invisible and windows with option for function to become visible.
So what I did is

Java Syntax (Toggle Plain Text)
public void actionPerformed(ActionEvent e)
{
	if(e.getSource() == btnFirst)
	{
		myApp.setVisible(false);  // pass control to selected function
		doSomething();
                myApp.setVisible(true);   // retrive control
	}						
}
public void actionPerformed(ActionEvent e)
{
	if(e.getSource() == btnFirst)
	{
		myApp.setVisible(false);  // pass control to selected function
		doSomething();
                myApp.setVisible(true);   // retrive control
	}						
}

however this get me following error

Java Syntax (Toggle Plain Text)
C:\MyApp.java:54: cannot find symbol
symbol  : method doSomething()
location: class MyApp
            doSomething();
            ^
C:\MyApp.java:54: cannot find symbol
symbol  : method doSomething()
location: class MyApp
            doSomething();
            ^

with call doSomething() I want to triger this

Java Syntax (Toggle Plain Text)
public RenameImage()
{
        myFrame = new JFrame("Do Something");
    	myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	buildGUI();
	myFrame.setSize(470,470);
    	myFrame.setVisible(true);
}
public RenameImage()
{
        myFrame = new JFrame("Do Something");
    	myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	buildGUI();
	myFrame.setSize(470,470);
    	myFrame.setVisible(true);
}

I don't even what to google for

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peter_budo

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Feb 18th, 2007

Re: Passing control

hmm, the blatantly obvious: check whether the method actually exists in the same class you're calling it from.

And of course rename RenameImage to renameImage.

jwenting

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duckman

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since Nov 2004

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Feb 18th, 2007

Re: Passing control

Came to same conclusion when I went to bed(funny enought I always find solution to problem went I go to sleep). But thats fine as long there would be solution :lol:
Now this peace of code doesn't do exactly what I want to do

Java Syntax (Toggle Plain Text)
if(e.getSource() == btnFirst)
{
	myApp.setVisible(false);  // pass control to selected function
	doSomething();
         myApp.setVisible(true);   // retrive control
}
if(e.getSource() == btnFirst)
{
	myApp.setVisible(false);  // pass control to selected function
	doSomething();
         myApp.setVisible(true);   // retrive control
}

it hidde myApp for time which take to display second application window and then it will display it again. I'm missing sort of control mechanizm which check if second window still in use, if yes keep it hidden. I tried to use while loop and check boolean in second application, but that kicked my CPU activity to 100% and I have to force to shut-down.
So how I do I get around this?
Secondly, I use JFrame setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) to close my windows, but this kill both frames.
So how do I specify I want to close only second JFrame?

peter_budo

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Feb 19th, 2007

Re: Passing control

NEW UPDATE
Problem with killing both JFrames sorted, replaced JFrame.EXIT_ON_CLOSE with JFrame.DISPOSE_ON_CLOSE.
Now I add it WindowEvents so if windowDeactivated it will setVisible to false and windowActivated to setVisible to true. However I can't triger windowActivated when I close the second window.
What shall I do?

peter_budo

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Feb 21st, 2007

Re: Passing control

Finaly found solution to my problem :cheesy:
Bellow is example code from java forum(link here) which shows how this thing can be done

Java Syntax (Toggle Plain Text)
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class test extends JFrame implements ActionListener {
  JButton frame1Button, frame2Button;
  JFrame frame1, frame2;
 
  public test() {
    super("Frame 1");
    frame2 = new JFrame("Frame 2");
    frame2Button = new JButton("Hide");
    frame2Button.addActionListener(this);
    JPanel frame2ButtonPanel = new JPanel();
    frame2ButtonPanel.add(frame2Button);
    frame2.getContentPane().add(frame2ButtonPanel, "North");
    frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame2.setSize(300,200);
    frame2.setLocation(350,350);
    frame2.setVisible(true);
    frame1 = this;
    frame1Button = new JButton("Hide");
    frame1Button.addActionListener(this);
    JPanel frame1ButtonPanel = new JPanel();
    frame1ButtonPanel.add(frame1Button);
    getContentPane().add(frame1ButtonPanel, "North");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(300,200);
    setLocation(100,100);
    setVisible(true);
  }
 
  public void actionPerformed(ActionEvent e) {
    JButton button = (JButton)e.getSource();
    if(button == frame1Button) {
      frame1.setVisible(false);
      frame2.setVisible(true);
    }
    if(button == frame2Button) {
      frame1.setVisible(true);
      frame2.setVisible(false);
    }
  }
 
  public static void main(String[] args) {
    new test();
  }
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class test extends JFrame implements ActionListener {
  JButton frame1Button, frame2Button;
  JFrame frame1, frame2;
 
  public test() {
    super("Frame 1");
    frame2 = new JFrame("Frame 2");
    frame2Button = new JButton("Hide");
    frame2Button.addActionListener(this);
    JPanel frame2ButtonPanel = new JPanel();
    frame2ButtonPanel.add(frame2Button);
    frame2.getContentPane().add(frame2ButtonPanel, "North");
    frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame2.setSize(300,200);
    frame2.setLocation(350,350);
    frame2.setVisible(true);
    frame1 = this;
    frame1Button = new JButton("Hide");
    frame1Button.addActionListener(this);
    JPanel frame1ButtonPanel = new JPanel();
    frame1ButtonPanel.add(frame1Button);
    getContentPane().add(frame1ButtonPanel, "North");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(300,200);
    setLocation(100,100);
    setVisible(true);
  }
 
  public void actionPerformed(ActionEvent e) {
    JButton button = (JButton)e.getSource();
    if(button == frame1Button) {
      frame1.setVisible(false);
      frame2.setVisible(true);
    }
    if(button == frame2Button) {
      frame1.setVisible(true);
      frame2.setVisible(false);
    }
  }
 
  public static void main(String[] args) {
    new test();
  }
}

peter_budo

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