Updating JFrame from a child JFrame

[agodfrey]

Hi, I am writing a Java program that uses a menu that is set up as a JFrame and one of the panels in it contain a ImageIcon. I then have a configuration JFrame that is created in a separate class from the menu class, but is created when the user clicks the config button in the menu panel. In the configuration JFrame the user can select a picture from the hard disk and it saves the path inside an Access database. This picture is the picture for the ImageIcon in the menu JFrame. I cant get it to update the picture in the menu frame when a user changes the picture, it will only do it when the program is restarted. I do have a method that updates picture and when it is called it updates the picture, but I cannot call it from the Configuration class i don't think sense the menu class has been started from main and the config class has been started from the listener in the menu class. any ideas. I hope this makes sense with what I am tring to do. Thanks.

 

[Miros]

You need to pass the menu JFrame into the configuration JFrame class (probably in the constructor) so that you can call its methods.

 

[agodfrey]

Im not sure how I would do that. let see if i can explain it better.

my code:

public class menuClass(){
//constructor

//methods to create JFrame and buttons

public void updatePic(){
//code to update picture
}

//listener for Configuration button that calls other class
...
Config con = new Config();
...
}

with code set up like this, i dont know how from the config class I can call the updatePic method, or access the JFrame.

I cannot pass the menuClass as a parameter can I?

Any help is much appreciated.

 

[Miros]

Yes, you can pass the menuClass as a parameter to the Config constructor:

Config con = new Config(this);

You just specify (menuClass menu) as a parameter for your Config constructor and save it off in a class variable there so you can use it later.