Learing GridBagLayout, The issue here is, the name label and combox don't show up on the top of the panel, but I have set its anchor to NORTH. Why ?
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.WindowConstants;
public class Test2 {
public Test2() {
JFrame frame = new JFrame();
frame.setTitle("test");
frame.getContentPane().setLayout(new GridLayout(1,2));
frame.setSize(800, 600);
JPanel panel1 = new JPanel();
panel1.setLayout(new GridBagLayout());
JLabel label = new JLabel("name");
GridBagConstraints gridBagConstraints = new GridBagConstraints();
gridBagConstraints.anchor = GridBagConstraints.NORTH;
gridBagConstraints.weightx = 0.0;
gridBagConstraints.weighty = 0.0;
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
panel1.add(label, gridBagConstraints);
String[] petStrings = { "Bird", "Cat", "Dog", "Rabbit", "Pig" };
JComboBox petList = new JComboBox(petStrings);
gridBagConstraints = new GridBagConstraints();
gridBagConstraints.anchor = GridBagConstraints.NORTH;
gridBagConstraints.fill = GridBagConstraints.HORIZONTAL;
gridBagConstraints.weightx = 1.0;
gridBagConstraints.weighty = 0.0;
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = 0;
panel1.add(petList, gridBagConstraints);
frame.getContentPane().add(panel1);
frame.getContentPane().add(new JPanel());
frame.setVisible(true);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new Test2();
}
}
You have to change
gridBagConstraints.weighty = 0.0;
to
gridBagConstraints.weighty = 1.0;
otherwise the area reserved for the component is slimmed to the size of the component, and it doesn't matter in which direction you "anchor" the component.
The result after changing the weighty is the following:
Related
I've recently been working with the layout manager GridBagLayout and have been running into trouble when it comes to the grid system it uses.
What I want to do is have the JButton I create here:
JButton myButton = new JButton("Some text");
gc.gridx = 2;
gc.gridy = 4;
gc.weightx = 0.5;
gc.weighty = 0.5;
jp.add(myButton, gc);
To be 2 columns over, and 4 rows down given the code:
gc.gridx = 2
gc.gridy = 4
I define the number of columns and rows in the component (JPanel) here:
GridBagConstraints gc = new GridBagConstraints();
gc.gridwidth = 2;
gc.gridheight = 10;
However, what I am getting is this:
The components are overlapping despite being in clearly different sections. Any help is much appreciated. Here is the full code:
package com.UI;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class UserInterface{
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame f = createFrame();
JPanel jp = createPanel();
addLabelAndText(jp);
f.add(jp, BorderLayout.WEST);
}
});
}
static JFrame createFrame() {
JFrame f = new JFrame();
f.setLayout(new BorderLayout());
f.setSize(new Dimension(600, 600));
f.setVisible(true);
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
return f;
}
static JPanel createPanel() {
JPanel jp = new JPanel();
jp.setBackground(Color.gray);
jp.setLayout(new GridBagLayout());
Dimension size = jp.getPreferredSize();
size.width = 200;
jp.setPreferredSize(size);
jp.setBorder(BorderFactory.createEtchedBorder());
return jp;
}
static void addLabelAndText(JPanel jp) {//How to call a type represented by the passed String? JLabel, for example?
GridBagConstraints gc = new GridBagConstraints();
gc.gridwidth = 2;
gc.gridheight = 10;
JTextField jtb = new JTextField(5);
JLabel jl = new JLabel("Enter input here: ");
gc.gridx = 2;
gc.gridy = 0;
gc.weightx = 0.5;
gc.weighty = 0.5;
gc.anchor = GridBagConstraints.NORTHEAST;
jp.add(jtb, gc);
gc.gridx = 1;
gc.gridy = 2;
gc.weightx = 0.5;
gc.weighty = 0.5;
gc.anchor = GridBagConstraints.NORTHWEST;
gc.anchor = GridBagConstraints.FIRST_LINE_END;
jp.add(jl, gc);
JButton myButton = new JButton("Some text");
gc.gridx = 2;
gc.gridy = 4;
gc.weightx = 0.5;
gc.weighty = 0.5;
jp.add(myButton, gc);
}
}
Thanks for any help
Okay, so I need your help guys. I don't know what I missed but the insets and anchor is not taking effect even though I've set the layout to GridBag.
I need to put the logout button just above the tabbedpane and position the logout button on the upper right hand corner. In other words, tabbed pane on position gridx = 0, gridy = 1; and logout Button on position gridx = 0, gridy = 0;
Also, the myaccount button, leftpanel and rightpanel which are inside the home panel, won't get the insets i applied.
What am I missing. Please help because I'm new to this layout.
TopPanel.java
package MainComponents;
import java.awt.Color;
import javax.swing.BorderFactory;
import javax.swing.JPanel;
import javax.swing.border.Border;
import MainTab_TabbedPane.TopTabbedPane;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
public class TopPanel extends JPanel {
//DECLARATION
JButton logOutButton = new JButton("Logout");
TopTabbedPane topTabbedPane = new TopTabbedPane();
private final Border myLineBorder = BorderFactory.createLineBorder(Color.BLACK, 2);
//CONSTRUCTOR
public TopPanel(){
setPanelInitialProperties();
addComponents();
}
//METHODS
private void setPanelInitialProperties(){
setLayout(new GridBagLayout());
setBorder(myLineBorder); //sets a Line Border for this panel
}
private void addComponents(){
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 1;
this.add(topTabbedPane); //adds TabbedPane holding Home, Administration... to this Top Panel
gbc.gridx = 0;
gbc.gridy = 0;
this.add(logOutButton);
}
}
HomeTopPanel.java
package HomeTab;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.border.Border;
public class HomeTopPanel extends JPanel {
private final JButton MyAccountButton = new JButton("My Account");
private final JPanel leftPanel = new JPanel(new GridBagLayout());
private final JPanel rightPanel = new JPanel(new GridBagLayout());
private final Border leftPanelLineBorder = BorderFactory.createLineBorder(Color.BLACK, 2);
private final Border rightPanelLineBorder = BorderFactory.createLineBorder(Color.BLACK, 2);
//CONSTRUCTOR
public HomeTopPanel(){
constructMyAccountButton();
constructPanels();
setLeftRightPanelBorders();
this.setLayout(new GridBagLayout());
}
private void constructMyAccountButton(){
GridBagConstraints MyAccountButton_gbc = new GridBagConstraints();
MyAccountButton_gbc.gridx = 0; MyAccountButton_gbc.gridy = 0;
MyAccountButton_gbc.anchor = GridBagConstraints.NORTHWEST;
this.add(MyAccountButton);
}
private void constructPanels(){
GridBagConstraints leftPanelgbc = new GridBagConstraints();
GridBagConstraints rightPanelgbc = new GridBagConstraints();
leftPanelgbc.insets = new Insets(3,3,3,3);
leftPanelgbc.gridx = 1; leftPanelgbc.gridy = 0;
leftPanel.setPreferredSize(new Dimension(300, 500));
this.add(leftPanel);
rightPanelgbc.insets = new Insets(3,3,3,3);
rightPanelgbc.gridx = 2; leftPanelgbc.gridy = 0;
rightPanel.setPreferredSize(new Dimension(300, 500));
this.add(rightPanel);
}
private void setLeftRightPanelBorders(){
leftPanel.setBorder(leftPanelLineBorder);
rightPanel.setBorder(rightPanelLineBorder);
this.setBorder(leftPanelLineBorder);
}
}
Thanks in advanced. I'm sure there's something I missed but I don't know.
INSETS won't apply. =( ??
UPDATE:
I added the insets with the following code:
private void constructPanels(){
GridBagConstraints gbc2 = new GridBagConstraints();
gbc2.gridx = 1; gbc2.gridy = 0;
gbc2.insets = new Insets(5, 5, 5, 5);
leftPanel.setPreferredSize(new Dimension(250, 300));
this.add(leftPanel,gbc2);
gbc2.gridx = 2; gbc2.gridy = 0;
gbc2.insets = new Insets(5, 5, 5, 5);
rightPanel.setPreferredSize(new Dimension(300, 500));
this.add(rightPanel,gbc2);
}
but still not getting any inset of 5.
Apply the constraints when adding components
add(topTabbedPane, gbc);
GridBagConstraints MyAccountButton_gbc = new GridBagConstraints();
Variable names should NOT start with an upper case character. Most of your other names are correct. Then is no reason to be sloppy. Follow the Java conventions.
constructMyAccountButton();
constructPanels();
setLeftRightPanelBorders();
this.setLayout(new GridBagLayout());
The layout must be set BEFORE you add components to the panel.
GridBagConstraints MyAccountButton_gbc = new GridBagConstraints();
MyAccountButton_gbc.gridx = 0; MyAccountButton_gbc.gridy = 0;
MyAccountButton_gbc.anchor = GridBagConstraints.NORTHWEST;
//this.add(MyAccountButton); // where is the constraint?
this.add(MyAccountButton, myAccountButton_gbc);
You actually have to use the constraint.
I have problems with GridBagLayout. I have to replace a component but after inserting the new one the positions change. See the following code as example.
At the start it is CYAN and YELLOW (from left to the right). After replacing it is YELLOW and RED. My desired result is RED and YELLOW. How can I fix this (with GridBagLayout)?
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class GBLTest extends JFrame
{
public static void main(String [] args)
{
new GBLTest();
}
JPanel panelA;
JPanel panelB;
JPanel panelAReplacement;
GBLTest()
{
this.setLayout(new GridBagLayout());
GridBagConstraints cons = new GridBagConstraints();
cons.weightx = 1.0;
cons.weighty = 1.0;
cons.fill = GridBagConstraints.BOTH;
panelA = new JPanel();
panelA.setBackground(Color.CYAN);
panelB = new JPanel();
panelB.setBackground(Color.YELLOW);
panelAReplacement = new JPanel();
panelAReplacement.setBackground(Color.RED);
cons.anchor = GridBagConstraints.EAST;
this.add(panelA, cons);
cons.anchor = GridBagConstraints.WEST;
this.add(panelB, cons);
GridBagConstraints oldCons = ((GridBagLayout) this.getContentPane().getLayout()).getConstraints(panelA);
this.remove(panelA);
this.add(panelAReplacement, oldCons);
this.setSize(new Dimension(200, 200));
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
}
}
I think you are not using the correct Layout for this pourpose.
You should use BorderLayout instead GridBagLayout. Or use the gridx and gridy properties to set the cell where each panel should be allocated.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class GBLTest extends JFrame
{
public static void main(String [] args)
{
new GBLTest();
}
JPanel panelA;
JPanel panelB;
JPanel panelAReplacement;
GBLTest()
{
this.setLayout(new GridBagLayout());
GridBagConstraints consA = new GridBagConstraints();
consA.weightx = 1.0;
consA.weighty = 1.0;
consA.fill = GridBagConstraints.BOTH;
consA.gridx = 0;
consA.gridy = 0;
GridBagConstraints consB = new GridBagConstraints();
consB.weightx = 1.0;
consB.weighty = 1.0;
consB.fill = GridBagConstraints.BOTH;
consB.gridx = 1;
consB.gridy = 0;
panelA = new JPanel();
panelA.setBackground(Color.CYAN);
panelB = new JPanel();
panelB.setBackground(Color.YELLOW);
panelAReplacement = new JPanel();
panelAReplacement.setBackground(Color.RED);
consA.anchor = GridBagConstraints.EAST;
this.add(panelA, consA);
consA.anchor = GridBagConstraints.WEST;
this.add(panelB, consB);
GridBagConstraints oldCons = ((GridBagLayout) this.getContentPane().getLayout()).getConstraints(panelA);
this.remove(panelA);
this.add(panelAReplacement, oldCons);
this.setSize(new Dimension(200, 200));
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
}
}
Here is my code. When I resize the program the other layouts, it works fine except for the CheckPanel (with GridBagLayout); somehow it became bigger. How can I handle this?
Advance Thanks.
JPanel CheckPanel = new JPanel();
CheckPanel.setBackground(Color.WHITE);
GridBagConstraints gbc_CheckPanel = new GridBagConstraints();
gbc_CheckPanel.gridwidth = 2;
gbc_CheckPanel.fill = GridBagConstraints.BOTH;
gbc_CheckPanel.gridx = 0;
gbc_CheckPanel.gridy = 1;
CenterPanel.add(CheckPanel, gbc_CheckPanel);
CheckPanel.setLayout(new GridLayout(0, 6, 0, 0));
The constraint
gbc_CheckPanel.fill = GridBagConstraints.BOTH;
tells the GridBagLayout to let this component use any available extra space (also depending on its preferred- and maximum size). Using GridBagConstraints.NONE or GridBagConstraints.VERTICAL could solve this, but you still have to decide which component will receive the extra space.
EDIT: Based on the comments, it is still not clear how the other components are inserted, and how the distribution of extra space is specified. In this example, the weighty fields are used to say that the table should receive all extra space. Maybe it helps to identify differences to the original program:
import java.awt.Color;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class CheckboxConstraints
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
#Override
public void run()
{
createAndShowGUI();
}
});
}
private static void createAndShowGUI()
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel centerPanel = new JPanel(new GridBagLayout());
centerPanel.setBackground(Color.RED);
fill(centerPanel);
f.getContentPane().setLayout(new GridLayout(1,1));
f.getContentPane().add(centerPanel);
f.setSize(500, 300);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
private static void fill(JPanel centerPanel)
{
addSearchBar(centerPanel);
addCheckBoxPanel(centerPanel);
addTable(centerPanel);
}
private static void addSearchBar(JPanel centerPanel)
{
GridBagConstraints gbc = null;
gbc = new GridBagConstraints();
gbc.gridwidth = 1;
gbc.fill = GridBagConstraints.BOTH;
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 0;
gbc.weighty = 0;
centerPanel.add(new JButton("Search"), gbc);
gbc = new GridBagConstraints();
gbc.gridwidth = 1;
gbc.fill = GridBagConstraints.BOTH;
gbc.gridx = 1;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.weighty = 0;
centerPanel.add(new JTextField(), gbc);
}
private static void addCheckBoxPanel(JPanel centerPanel)
{
JPanel checkPanel = new JPanel();
checkPanel.setBackground(Color.WHITE);
GridBagConstraints gbc_CheckPanel = new GridBagConstraints();
gbc_CheckPanel.gridwidth = 2;
gbc_CheckPanel.fill = GridBagConstraints.BOTH;
gbc_CheckPanel.gridx = 0;
gbc_CheckPanel.gridy = 1;
gbc_CheckPanel.weighty = 0;
centerPanel.add(checkPanel, gbc_CheckPanel);
checkPanel.setLayout(new GridLayout(0, 6, 0, 0));
checkPanel.add(new JCheckBox("C0"));
checkPanel.add(new JCheckBox("C1"));
checkPanel.add(new JCheckBox("C2"));
checkPanel.add(new JCheckBox("C3"));
checkPanel.add(new JCheckBox("C4"));
checkPanel.add(new JCheckBox("C5"));
}
private static void addTable(JPanel centerPanel)
{
JTable table = new JTable(new Object[][] {
{"C00", "C01" },
{"C00", "C01" },
}, new Object[]{ "H0", "H1" });
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = 2;
gbc.fill = GridBagConstraints.BOTH;
gbc.gridx = 0;
gbc.gridy = 2;
gbc.weighty = 1.0;
JScrollPane scrollPane = new JScrollPane(table);
centerPanel.add(scrollPane, gbc);
}
}
Please try:
gbc_CheckPanel.fill =GridBagConstraints.HORIZONTAL
and to adjust the space vertically
gbc_CheckPanel.ipady = 20; //Not sure this works in your case but this should fix the resizing issue
Another solution is to add a new JPanel with BorderLayout and insert the panel with JCheckBoxes using the constraint BorderLayout.NORTH and the table with constraint BorderLayout.CENTRE
I want to have a JSeparator between each JLabel in a GridBagLayout. Currently it looks like this:
And now I want to add a JSeparator after each TESTSTEP Label in between the icon and the JLabel. The following constraint are only for the JLabel and the icon. What do I have to add to get a JSeparator all over the complete vertical line?
GridBagConstraints lastConstraints = new GridBagConstraints();
GridBagConstraints labelConstraints = new GridBagConstraints();
lastConstraints.fill = GridBagConstraints.NONE;
lastConstraints.anchor = GridBagConstraints.EAST;
lastConstraints.weightx = 0.0;
lastConstraints.gridwidth = GridBagConstraints.REMAINDER;
lastConstraints.insets = new Insets(8, 8, 8, 8);
labelConstraints = (GridBagConstraints) lastConstraints.clone();
labelConstraints.weightx = 0.0;
labelConstraints.fill = GridBagConstraints.NONE;
labelConstraints.anchor = GridBagConstraints.WEST;
labelConstraints.gridwidth = 1;
Use:
fill = HORIZONTAL;
weightx = 1.0;
gridwidth = REMAINDER;
Small example:
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
public class TestJSeparator {
public TestJSeparator() {
JFrame frame = new JFrame(TestJSeparator.class.getSimpleName());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel bigPanel = new JPanel(new GridBagLayout());
GridBagConstraints lastConstraints = new GridBagConstraints();
GridBagConstraints labelConstraints = new GridBagConstraints();
GridBagConstraints separatorConstraint = new GridBagConstraints();
lastConstraints.fill = GridBagConstraints.NONE;
lastConstraints.anchor = GridBagConstraints.EAST;
lastConstraints.weightx = 0.0;
lastConstraints.gridwidth = GridBagConstraints.REMAINDER;
lastConstraints.insets = new Insets(8, 8, 8, 8);
labelConstraints = (GridBagConstraints) lastConstraints.clone();
labelConstraints.weightx = 0.0;
labelConstraints.fill = GridBagConstraints.NONE;
labelConstraints.anchor = GridBagConstraints.WEST;
labelConstraints.gridwidth = 1;
separatorConstraint.weightx = 1.0;
separatorConstraint.fill = GridBagConstraints.HORIZONTAL;
separatorConstraint.gridwidth = GridBagConstraints.REMAINDER;
JLabel label1 = new JLabel("1. TESTSTEP 0 TEST 0 DE");
JLabel result1 = new JLabel(UIManager.getIcon("OptionPane.informationIcon"));
JLabel label2 = new JLabel("2. TESTSTEP 0 TEST 1 DE");
JLabel result2 = new JLabel(UIManager.getIcon("OptionPane.errorIcon"));
bigPanel.add(label1, labelConstraints);
bigPanel.add(result1, lastConstraints);
bigPanel.add(new JSeparator(JSeparator.HORIZONTAL), separatorConstraint);
bigPanel.add(label2, labelConstraints);
bigPanel.add(result2, lastConstraints);
bigPanel.add(new JSeparator(JSeparator.HORIZONTAL), separatorConstraint);
frame.add(bigPanel);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
TestJSeparator gui = new TestJSeparator();
}
});
}
}