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javaswinglayout-managergridbaglayout

Another GridBagLayout Alignment

I read a lot about this problem here... But I just don't seem to get how to solve this. All the solutions I tried are not working.

But let's start at the beginning: I'm building my interface with Swing and trying to be modular. So I've got a class (extending JPanel) for my left Main Menu. The Menu is built with several buttons in a GridBagLayout.

But I am not able to get this layout to aligned to the top of the window (panel). Example: Label at the Top of the Panel, Text Field below, button below the text field, etc.

Please see my code:

public class LeftMenu extends JPanel {
  public LeftMenu(){

    GridBagLayout gbl_panel = new GridBagLayout();
    gbl_panel.columnWidths = new int[] { 86, 0 };
    gbl_panel.rowHeights = new int[] {32, 32, 32, 32, 32, 32, 32, 32, 32 };
    gbl_panel.columnWeights = new double[] { 0.0, Double.MIN_VALUE };
    gbl_panel.rowWeights = new double[] { 0.0, 0.0, 0.0, 0.0, 0.0 };
    setLayout(gbl_panel);

    JLabel lblEnterTrunkId = new JLabel("Enter Trunk ID");
    GridBagConstraints gbc_lblEnterTrunkId = new GridBagConstraints();
    gbc_lblEnterTrunkId.fill = GridBagConstraints.HORIZONTAL;
    gbc_lblEnterTrunkId.insets = new Insets(0, 0, 5, 0);
    gbc_lblEnterTrunkId.gridx = 0;
    gbc_lblEnterTrunkId.gridy = 0;
    gbc_lblEnterTrunkId.anchor = GridBagConstraints.NORTH;
    add(lblEnterTrunkId, gbc_lblEnterTrunkId);
    }
 }

There is a text field and some buttons following behind the Label. But I assume, these are not relevant... If they are... they are mostly looking like the Label (just that they are not Labels... I think you get me)

All guides I read, are all pointing to the anchor of the GridBagConstraint. It is there.... but not working. It's wonderfully aligned in the middle of the panel.

If it does matter: the Panel ist used as a LeftComponent of a SplitPane:

public LeftMenu leftpanel = new LeftMenu(); 

splitPaneTrunks.setLeftComponent(leftpanel);

Looking forward to your help.

Here is a picture of my side menu... centered horizontally. as it should not be.

https://i.sstatic.net/NsBg2.png

Solution

  • Instead of using GridBagLayout, you could make a wrap using a JPanel with the layout BorderLayout, like so:

        setLayout(new BorderLayout());

    JPanel gridBagWrap = new JPanel();

    GridBagLayout gbl_panel = new GridBagLayout();
    gbl_panel.columnWidths = new int[] { 86, 0 };
    gbl_panel.rowHeights = new int[] {32, 32, 32, 32, 32, 32, 32, 32, 32 };
    gbl_panel.columnWeights = new double[] { 0.0, Double.MIN_VALUE };
    gbl_panel.rowWeights = new double[] { 0.0, 0.0, 0.0, 0.0, 0.0 };
    gridBagWrap.setLayout(gbl_panel);

    JLabel lblEnterTrunkId = new JLabel("Enter Trunk ID");
    GridBagConstraints gbc_lblEnterTrunkId = new GridBagConstraints();
    gbc_lblEnterTrunkId.fill = GridBagConstraints.HORIZONTAL;
    gbc_lblEnterTrunkId.insets = new Insets(0, 0, 5, 0);
    gbc_lblEnterTrunkId.gridx = 0;
    gbc_lblEnterTrunkId.gridy = 0;
    gbc_lblEnterTrunkId.anchor = GridBagConstraints.NORTH;
    gridBagWrap.add(lblEnterTrunkId, gbc_lblEnterTrunkId);

    add(gridBagWrap, BorderLayout.NORTH);