使用Grix，gridy删除JTextField

Question

I want to know if its possible to remove a JTextField using GridBagLayout and removing like this.

PANEL.remove(gridx.5, gridy.5) ---< is this possible?

Or how can I remove with this sort of logic.

Answer 1

No there is no method that does that, you will need to write your own.

1. The Container class has a method getLayout() . This will allow you to get the GridBagLayout instance for your panel.
2. The Container class also has a method getComponents()

So once you get all the components in an array you iterate through the array. For each component you would:

1. Use the getConstraints() method of the GridBagLayout .
2. Then check the gridx and gridy value of the GridBagConstraints object to see what clumn/row the component is in.
3. Remove the component from the panel if it meets your criteria.

After the loop is finished you invoke revalidate() on the panel.

Edit:

Somewhere in your code you need to set the layout manager to the GridBagLayout. Then you add components to the panel using your GridBagConstraints.

Then in the future when you want to remove the component from the panel you need to reference:

1. the JPanel you added the components to
2. the GridBagLayout of the above panel

I gave you the methods you need to accomplish this. So did you read the API for the methods I suggest you need to use?

The basic code would be:

GridBagLayout layout = (GridBagLayout)panel;
Component[] components = panel.getComponent();

for (each component in the array)
{
    GridBagConstraint gbc = layout.getConstraints( component )

    if (gbc.gridX == ?? && gbc.gridY = ??)
    {
        // remove the component from the panel
    }
}

panel.revalidate();

So I would suggest you create a method that passes in the row and column of the component you want to find. Then you can change the if condition to access these parameters.