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add child in parent constructor [message #897331]

Mon, 23 July 2012 15:41

user Kyle

Messages: 19
Registered: April 2012

Junior Member

Hi,

I have a problem, I want to add child in parent constructor but it don't work!

For example (in swing),

In my main I have,

MyPanel panel = new MyPanel();

And MyPanel contains some composite like,

public MyPanel() {
   textField = new JTextField();
   add(textField);
   textField.setColumns(10);
}

If child is not in constructor (so just after line, MyPanel panel = new MyPanel(); for example) it works but not if I put child in my contructor!

Thanks to your help

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Re: add child in parent constructor [message #897423 is a reply to message #897331]

Tue, 24 July 2012 05:09

Eric Clayberg

Messages: 979
Registered: July 2009
Location: Boston, MA

Senior Member

Works fine for me.

I'm not sure what you mean by "it don't work". Please be specific.

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Re: add child in parent constructor [message #897447 is a reply to message #897331]

Tue, 24 July 2012 07:48

user Kyle

Messages: 19
Registered: April 2012

Junior Member

For example, if I use wizard "Application Window" in Swing designer:
I have the code:

private void initialize() {
		frame = new JFrame();
		frame.setBounds(100, 100, 450, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().setLayout(null);
		
		JPanel panel = new JPanel();
		panel.setBounds(21, 11, 373, 226);
		frame.getContentPane().add(panel);
		panel.setLayout(null);
		
		JButton btnNewButton = new JButton("New button");
		btnNewButton.setBounds(124, 107, 89, 23);
		panel.add(btnNewButton);
	}

But if I want to customize my panel and I add child in constructor like:

private void initialize() {
		frame = new JFrame();
		frame.setBounds(100, 100, 450, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().setLayout(null);
		
		MyPanel panel = new MyPanel();
		panel.setBounds(10, 11, 270, 194);
		frame.getContentPane().add(panel);
		panel.setLayout(null);		
	}

And MyPanel constructor (who extends JPanel):

public MyPanel(){
		super();
		JButton btnNewButton = new JButton("New button");
		btnNewButton.setBounds(89, 60, 89, 23);
		add(btnNewButton);
	}

In designer my button does not appear on tree and I can not select it!

Thanks to your answer Wink

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Re: add child in parent constructor [message #898551 is a reply to message #897447]

Thu, 26 July 2012 14:59

user Kyle

Messages: 19
Registered: April 2012

Junior Member

If it's not implemented in original toolkits, have you any idea on how can I proced for my toolkit?

For example, how can I proced to parse and create JavaInfo in all my project? Not only in main page..

[Updated on: Thu, 26 July 2012 15:06]

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Re: add child in parent constructor [message #898642 is a reply to message #897447]

Fri, 27 July 2012 01:35

Eric Clayberg

Messages: 979
Registered: July 2009
Location: Boston, MA

Senior Member

user Kyle wrote on Tue, 24 July 2012 03:48

In designer my button does not appear on tree and I can not select it!

Everything is working as expected. That button should not appear in the tree of the App Window as it is a component private to MyPanel (doing so would require breaking encapsulation which is not allowed). It should only show up in the tree of MyPanel.

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