java.awt.Image.getWidth() Not Working!

[drkestrel]

Right- this is want I want to do.

I have a background image which is added to as a background image to a third party API class which extends Java.awt.Container. Such container is then added to the Content Pane of MyClass (which extends JFrame)

I want to read the width and height of the image and resize MyClass accordingly.

Problem is calling theImage.getWidth(MyClass.this) or theImage.getWidth(theThirdPartyAPIContainer) always return -1 and -1 denoting that no information is available.

What do I need to do to obtain the height and width?

 

[drkestrel]

Now I figure out I need to do something like

    Image img = getToolkit().getImage(imgURL);
    MediaTracker tracker = new MediaTracker(this);
    tracker.addImage(img,0);
    try   
    {
        tracker.waitForID(0);
    }
    catch (InterruptedException e){}
    int w = img.getWidth(this);
    int h = img.getHeight(this);

However, what I have is the following

MyFrame---
          |
_________ \/____________________________________
|                JMenuBar                       |
|_______________________________________________|
|                                               |
|                                               |
|                                               |
|Third Party Class extending java.awt.Container |
|      containing an image of known size        |
|                                               |
|_______________________________________________|

I am trying to calculate what size MyFrame needs to be. MyFrame extends JFrame.

I am fine for the width
I do

Insets frameInsets = this.getInsets();
width = image.getWidth() + frameInsets.left + frameInsets.right;

Height is the problem
After some Trial an error it LOOKS on Solaris as if the following is right-

height = image.getHeight()+frameInsets.top+ myJMenuBar.getSize()+getHeight+ myJMenuBar.getInsets().top + myJMenuBar.getInsets().bottom

I cannot comprehend whether this is just a coincidence or not as I don't know why frameInsets.bottom should in any case be excluded.
Here are the dimensions-
frameInsets.left = 6
frameInsets.right= 6
frameInsets.top =28
frameInsets.bottom = 6
JMenuBar height = 23
JMenuBar's Insets.top = 1
JMenuBar's Insets.bottom = 1

What should be the 'correct' calculations and does the Insets for the JMenuBar and the JFrame overlaps?

 

[drkestrel]

After some more experimentation, it turns out that the calculation is really

height = image.getHeight()+frameInsets.top + frameInsets.bottom + myJMenuBar.getSize()+getHeight+ myJMenuBar.getInsets().top + myJMenuBar.getInsets().bottom

This works fine. However, MyFrame has a "New Window" JMenuItem that creates another window with the same image inside the theThirdPartyAPIContainer. Very strangely, for the new window, I get
frameInsets.left = 0
frameInsets.right= 0
frameInsets.top =0
frameInsets.bottom = 0
JMenuBar height = 0.0
JMenuBar's Insets.top = 1
JMenuBar's Insets.bottom = 1

Just what is going on?

The skeleton of my code is

class MyFrame extends JFrame
/// .....
    public MyFrame()
    {
    //.. do something
    buildFrame();
    drawMenu();

    this.show();
    }

    private buildFrame()
    {
        //Load image into myURL and set it as
        // background in a thirdParty API awtComponent

    }

    private drawMenu()
    {
        JMenuItem newItem = new JMenuItem("New Window");
        newItem.addListener(// a Listener which does 
        MyFrame newFrame = new MyFrame());
        JMenu fileMenu = new JMenu("File");
        fileMenu.add(newItem);
        JMenuBar myBar = new JMenuBar();
        myBar.add(fileMeun);
    }
}