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Thread: JComboBox size?

  1. #1
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    Default JComboBox size?

    I'm trying to set a maximum size in a JComboBox, but I can't do it.
    I'm willing to do it so I can put the selecter next to a JLabel, but it's going into the second line, and not following the GridLayout

    package temporizadorDeEventos;
     
    import java.awt.Container;
    import java.awt.Dimension;
    import java.awt.GridLayout;
     
    import javax.swing.JComboBox;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
     
    @SuppressWarnings("serial")
    public class Informacoes extends JFrame {
     
    	JLabel qualDia;
    	public Integer[] dias = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,29,21,22,23,24,25,26,27,28,29,30,31};
    	JComboBox<Integer> opDias;
    	public Dimension tamanhoJB = new Dimension(2, 3);
     
    	public Informacoes(){
     
    		super("Novo Temporizador");
     
    		Container c1 = getContentPane();
    		c1.setLayout(new GridLayout(15,3));
     
    		qualDia = new JLabel("Select a number");
    		opDias = new JComboBox<Integer>(dias);
    			opDias.setPrototypeDisplayValue(22);
    			opDias.setMaximumSize(tamanhoJB);
    			opDias.setSize(tamanhoJB);
     
    		c1.add(qualDia);
    		c1.add(opDias);
     
    		setDefaultCloseOperation(EXIT_ON_CLOSE);
    		setSize(300, 300);
    		setVisible(true);	
    	}
     
     
    	public static void main(String[] args){
    		new Informacoes();
     
    	}
     
    }

    I tried using the methods

    opDias.setPrototypeDisplayValue(00);
    opDias.setMaximumSize(tamanhoJB);
    opDias.setSize(tamanhoJB);

    But neither of this work, the size is still big!


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    Default Re: JComboBox size?

    You might want to experiment with FlowLayout. I don't know what else you plan to add to the interface, but setting the layout to a FlowLayout and then adding the JLabel and JComboBox will give you the effect you've described.

    As an aside, using the JFrame's content pane was a technique that became unnecessary with Java 1.4 (I think). You can accomplish the same thing now by adding directly to the JFrame.

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    Default Re: JComboBox size?

    I got the part of the content pane! Thanks for that!!

    About the FlowLayout, could you tell me how to make a linebreak on a FlowLayout? Because I need 15 lines of information, and making a FlowLayout would put everything in a row, wouldn't it?


    @@Edit

    For the getContentPane() trick I were using, I changed it for
    this.setLayout(new FlowLayout());
    this.add(); etc...
    Was this what you meant?
    Last edited by Kerooker; May 23rd, 2014 at 07:16 PM.

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    Default Re: JComboBox size?

    Are the 15 lines of info of the same format:

    JLabel, JComboBox
    JLabel, JComboBox
    JLabel, JComboBox

    etc. , 15 times?

    You had a third column. What was that for?

    As for your edits, Yes, that's what I had in mind, but the 'this.' is not required. It's okay to include, but not necessary.

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    Default Re: JComboBox size?

    The third column was a mistake

    No, not all with the same format. Some are Label-Jbox ; some are Label-JTextBox .... Some are with imageicon.. That's why I needed the GridLayout

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    Default Re: JComboBox size?

    Then I think a GridLayout is not what you want. In a GridLayout, "each cell is exactly the same size." (From the How to Use GridLayout page.) That's great for chess/checker boards, tic-tac-toe, and other applications where the sizes of each cell don't need to accommodate different sized contents like what you've described.

    I don't know which layout is (or layouts are) best for your design. If you size the components appropriately and prevent the container from being resized, FlowLayout might be the simplest to do. If that approach does not meet your requirements, then you'll have to try a combination of containers and components. Don't restrict yourself to a single container. Maybe a container containing multiple containers will give the flexibility and control you need.

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    Default Re: JComboBox size?

    You might want to try SpringLayout. Take a look at the screenshots at How to Use SpringLayout (The Java™ Tutorials > Creating a GUI With JFC/Swing > Laying Out Components Within a Container) to see if it meets your needs.

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