GridBagLayout, & addComp() What are the parameters?

[Shawn Rieger]

My confusion in in the addComp() function...

addComp(jlbl1, container, gbConst, 0, 0, 2, 1, 5, 1);

What are the last 6 parameters? Im assuming the first 2 ("0, 0,") are row and column. But when I add jlbl3 at ("1, 1") the label ends up at the top row right next to the first label. Im confused. And what are the rest of the parameters?

Any help out there?

public class PaintEstimatorView extends JFrame {

private JLabel jlbl1 = new JLabel("Square Ft/Gallon", JLabel.LEFT);
private JLabel jlbl2 = new JLabel("Gallons Required", JLabel.LEFT);
private JLabel jlbl3 = new JLabel("Number of Coats", JLabel.LEFT);
private JLabel jlbl4 = new JLabel(".", JLabel.LEFT);
private JButton jbtComputeGallons = new JButton("Compute Gallons Needed");
private JLabel jlbl5 = new JLabel("-----------------------------------------", JLabel.CENTER);


public PaintEstimatorView() {
//Set GridBagLayout in the container
Container container = getContentPane();
container.setLayout(new GridBagLayout());

//Create a GridBagConstraints object
GridBagConstraints gbConst = new GridBagConstraints();

gbConst.gridx = 0;
gbConst.gridy = 0;
gbConst.gridwidth = 4;
gbConst.gridheight = 13;
gbConst.fill = GridBagConstraints.NONE;
gbConst.anchor = GridBagConstraints.NORTHWEST;

// jlbl1 - Row 0, Col 0
addComp(jlbl1, container, gbConst, 0, 0, 2, 1, 5, 1);
 
// jlbl3 - Row 1, Col 1
addComp(jlbl3, container, gbConst, 1, 1, 3, 1, 5, 1);
}

/** Add a component to the containter of GridBagLayout */
private void addComp(Component c, Container container,
GridBagConstraints gbConst,
int row, int column,
int numberOfRows, int numberOfColumns,
double weightx, double weighty) {
// Set Parameters
gbConst.gridx = column;
gbConst.gridy = row;
gbConst.gridwidth = numberOfColumns;
gbConst.gridheight = numberOfRows;
gbConst.weightx = weightx;
gbConst.weighty = weighty;

// Add component to the container with the specified layout
container.add(c, gbConst);
}

}

[Stephen Boston]

Ok, you've got the first two (Gridx and Gridy)
then there is gridwidth and gridheight followed by weightx and weighty.

From Sun:

GridBagConstraints

public GridBagConstraints(int gridx,
int gridy,
int gridwidth,
int gridheight,
double weightx,
double weighty,
int anchor,
int fill,
Insets insets,
int ipadx,
int ipady)

Creates a GridBagConstraints object with all of its fields set to the passed-in arguments. Note: Because the use of this constructor hinders readability of source code, this constructor should only be used by automatic source code generation tools.

Parameters:
gridx - The initial gridx value.
gridy - The initial gridy value.
gridwidth - The initial gridwidth value.
gridheight - The initial gridheight value.
weightx - The initial weightx value.
weighty - The initial weighty value.
anchor - The initial anchor value.
fill - The initial fill value.
insets - The initial insets value.
ipadx - The initial ipadx value.
ipady - The initial ipady value.

Sun has a very good tutorial on using GridBagLaout. How to use GridBagLayout

hth

Steve