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Thread: JComboBox with scroll bars.

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    Default JComboBox with scroll bars.

    Hello,

    I have to make a graphical application, which has a JComboBox and scroll bars. I tried quite a few things, nothing worked and I don't know why. Here is the code I currently have.

    package Java24;
     
    import java.awt.*;
    import javax.swing.*;
     
    public class HR16ComboScroll extends JFrame{
    	//Hour sixteen, activity one.	
     
     
    	public HR16ComboScroll(){
    		super("Combo Scroll");
    		setSize(400,600);
    		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);		
    		FlowLayout flo = new FlowLayout();
    		setLayout(flo);
     
    		String[] contents = new String[]{"Alem", "Habtam", "Desta", "Almaz", 
    				"Zewdit", "Abraham", "Tsehaye"};
    		JScrollBar pane = new JScrollBar();
    		JComboBox list = new JComboBox(contents);
    		list.addItem(pane);
    		add(list);
     
    		setVisible(true);
    	}
     
    	//run
    	public static void main(String[] args){
    		HR16ComboScroll pane = new HR16ComboScroll();
    	}
    }
    Last edited by Melawe; October 9th, 2011 at 07:04 PM.


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    Administrator copeg's Avatar
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    Default Re: JComboBox with scroll bars.

    I moved your post to the Swing forum - perhaps get more attention there. And ++ for the SSCCE.

    I'm not sure what you mean when you say "which has a JComboBox and scroll bars". How do you want these components organized?

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    Default Re: JComboBox with scroll bars.

    Quote Originally Posted by copeg View Post
    And ++ for the SSCCE.
    Sorry not sure what you mean.

    Quote Originally Posted by copeg View Post
    I'm not sure what you mean when you say "which has a JComboBox and scroll bars". How do you want these components organized?
    Quote from book: "Create a GUI that includes a combo box in a scroll pane.".

    Edit:
    It does compile but the list doesn't have scroll bars, rather a long string, I don't know what the string means though(looks kinda like an exception).
    Last edited by Melawe; October 9th, 2011 at 11:25 PM.

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    Default Re: JComboBox with scroll bars.

    Updated code:
    public class HR16ComboScroll extends JFrame{
     
    	public HR16ComboScroll(){
    		super("Combo Scroll");
    		setSize(200,50);
    		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);		
    		FlowLayout flo = new FlowLayout();
    		setLayout(flo);
     
    		String[] contents = new String[]{"Alem", "Habtam", "Desta", "Almaz", 
    				"Zewdit", "Abraham", "Tsehaye"};		
    		JComboBox list = new JComboBox(contents);
    		JScrollPane pane = new JScrollPane(list,
                    JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
    		JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    		//list.addItem(pane);
    		add(pane);
     
    		setVisible(true);
    	}
     
    	//run
    	public static void main(String[] args){
    		HR16ComboScroll pane = new HR16ComboScroll();
    	}
    }

    The drop down list currently has the names in the contents array only. Problem: scroll bars should be within the combo box; not the other way around.
    Last edited by Melawe; October 9th, 2011 at 11:53 PM.

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    Administrator copeg's Avatar
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    Default Re: JComboBox with scroll bars.

    Sorry not sure what you mean.
    Just a thanks for the short, self contained, complable example (sscce).

    JComboBox by default already has a JScrollPane capability within the popup window. You can use the method setMaximumRowCount() to set the number of rows displayed you wish to display - the rest are viewable by scrolling

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    Default Re: JComboBox with scroll bars.

    Quote Originally Posted by copeg View Post
    Just a thanks for the short, self contained, complable example (sscce).
    Ah, yourwelcome.

    Quote Originally Posted by copeg View Post
    JComboBox by default already has a JScrollPane capability within the popup window. You can use the method setMaximumRowCount() to set the number of rows displayed you wish to display - the rest are viewable by scrolling
    Oh, hmm, I think I've completed the assignment. If so, the scroll bar is useless, do you think I completed it?

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    Default Re: JComboBox with scroll bars.

    I guess I completed it. Thanks for you help!

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