I have a JPanel containing JButtons and a few other things, and I want the entire panel to have a tool-tip. When I call setToolTipText on the JPanel, the tool-tip only appears in empty spaces within the JPanel.
Is there a way to set a tool-tip on the JPanel such that it applies to the JPanel and its children, or am I stuck with calling setToolTipText on all the children as well?
Create a recursive method:
public static void setToolTipRecursively(JComponent c, String text) {
c.setToolTipText(text);
for (Component cc : c.getComponents())
if (cc instanceof JComponent)
setToolTipRecursively((JComponent) cc, text);
}
Full example:
public static void main(String[] args) {
final JFrame frame = new JFrame("Test");
frame.add(new JLabel("Testing (no tooltip here)"), BorderLayout.NORTH);
final JPanel panel = new JPanel(new GridLayout(2, 1));
panel.setBackground(Color.RED);
panel.add(new JLabel("Hello"));
panel.add(new JTextField("World!"));
setToolTipRecursively(panel, "Hello World!");
frame.add(panel, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setVisible(true);
}
Related
I am trying to write a Title for the main menu of my program, by using a JLabel, but it doesn't seem to appear on my screen.
import javax.swing.*;
public class GUI {
public GUI() {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
panel.setBorder(BorderFactory.createEmptyBorder(30,30,10,30));
panel.setLayout(new GridLayout());
frame.add(panel, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Title");
frame.pack();
frame.setSize(854,560);
frame.setVisible(true);
JLabel title = new JLabel();
title.setText("Title");
//title.setSize();
title.setVisible(true);
}
public static void main(String[] args) {
new GUI();
}
}
What am I doing wrong and how could I change the position of the Text if I manage to make it visible?
And I also want to add a button to go to the next page so if you could tell me how to do that too that would be great.
I would quickly and untested say that you are adding the label after you set the frame visible.
Do it before. Else you would have to revalidate and repaint the frame
As I can see in your code you are not adding title in panel. As a quick solution put panel.add(title); after title.setVisible(true); line in your code, it will display the label.
JFrame frame = new JFrame();
JPanel panel = new JPanel();
panel.setBorder(BorderFactory.createEmptyBorder(30,30,10,30));
panel.setLayout(new GridLayout());
frame.add(panel, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Title");
frame.pack();
frame.setSize(854,560);
frame.setVisible(true);
JLabel title = new JLabel();
title.setText("Title");
//title.setSize();
title.setVisible(true);
panel.add(title); //<---- this one line will diaplay label in GUI
I am having some difficulty getting a JDesktopPane (that contains a JInternalFrame) to add to a JPanel. What is the proper way to do this? What am I doing wrong?
Here is my bare bones example:
import javax.swing.*;
import java.awt.*;
public class MainPanel extends JPanel {
JDesktopPane jDesktopPane = new JDesktopPane();
JInternalFrame jInternalFrame = new JInternalFrame();
public MainPanel() {
jDesktopPane.add(jInternalFrame);
add(jDesktopPane);
setSize(400,400);
setVisible(true);
}
private static void createAndShowGui() {
JFrame frame = new JFrame("This isn't working...");
MainPanel mainPanel = new MainPanel();
frame.setLayout(new BorderLayout());
frame.add(mainPanel, BorderLayout.CENTER);
frame.setContentPane(mainPanel);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setLocationByPlatform(false);
frame.setSize(500, 500);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
JDesktop doesn't use a layout manager, so it's default/preferred size is 0x0
JPanel uses FlowLayout by default, which honours the preferredSize of it's child components when it lays them out
So, in your constructor, you could try changing the default layout manager to BorderLayout instead...
public MainPanel() {
setLayout(new BorderLayout());
jDesktopPane.add(jInternalFrame);
add(jDesktopPane);
// pointless
//setSize(400,400);
// pointless
//setVisible(true);
}
Now, you because nothing is actually defining a preferred size for anything, you should provide your own...
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
Then when you create the UI you can simply pack the frame...
private static void createAndShowGui() {
JFrame frame = new JFrame("This should be working now...");
MainPanel mainPanel = new MainPanel();
frame.setLayout(new BorderLayout());
// pointless considering the setContentPane call
//frame.add(mainPanel, BorderLayout.CENTER);
frame.setContentPane(mainPanel);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.pack();
frame.setLocationByPlatform(false);
//frame.setSize(500, 500);
frame.setVisible(true);
}
Now because JDesktopPane doesn't use any layout manager, you become responsible for ensuring that anything your add to it is positioned and size
jInternalFrame.setBounds(10, 10, 200, 200);
// Just like any frame, it's not visible when it's first created
jInternalFrame.setVisible(true);
How can I switch Panels with ScrollPanes in a Frame? I've tried many possible ways but cannot come up with a solution to.
Actually this is one of the Java Problems my professor gave me and I needed to accomplish this by not using other layouts (such as CardLayout) and I should use the null layout only. Additional classes are allowed as long as I maintain these three classes and the scroll pane.
public class MainDriver {
public static void main(String[] args) {
JFrame frame = new JFrame("Frame");
panel1 p1 = new panel1();
panel2 p2 = new panel2();
JScrollPane jsp = new JScrollPane(panel1.panel);
Container c = frame.getContentPane();
jsp.getVerticalScrollBar().setUnitIncrement(10);
c.add(jsp);
//codes for panel switching from panel1 to panel2 vice versa
frame.setDefaultCloseOperation(JFrame.exit_ON_CLOSE);
frame.setSize(1058, 600);
frame.setLocation(100, 50);
frame.setVisible(true);
}
}
---------------------------------------------
public class panel1{
public JPanel panel(){
JPanel fore = new JPanel();
fore.setLayout(null);
fore.setPreferredSize(new Dimension (1024, 600));
fore.setBackground(Color.decode("#004050"));
fore.setVisible(true);
JButton but = new JButton();
but.setLocation(425, 300);
but.setSize(100, 35);
//button action/mouse listener
fore.add(but);
return fore;
}
}
---------------------------------------------
public class panel2{
public JPanel panel(){
JPanel fore = new JPanel();
fore.setLayout(null);
fore.setPreferredSize(new Dimension (1024, 600));
fore.setBackground(Color.decode("#004050"));
fore.setVisible(true);
JButton but = new JButton();
but.setLocation(425, 300);
but.setSize(100, 35);
//button action/mouse listener
fore.add(but);
return fore;
}
}
How can I switch Panels with ScrollPanes in a Frame?
scrollPane.setViewportView( anotherPanel );
Can anyone help me. Why is the Label "Current" NOT left aligned in Panel/Frame?
public static void main(String[] args) {
JFrame TFrame = new JFrame("Test DisplayLayout");
TFrame.setResizable(true);
TFrame.setSize(new Dimension(900, 840));
TFrame.setLocationRelativeTo(null);
TFrame.setTitle("DisplayLayout");
TFrame.setVisible(true);
JPanel P = DisplayLayout2();
P.setVisible(true);
P.setOpaque(true);
P.setLayout(new BoxLayout(P, BoxLayout.Y_AXIS));
TFrame.add(P);
TFrame.revalidate();
TFrame.repaint();
}
public static JPanel DisplayLayout2() {
JPanel Panel=new JPanel();
Panel.setVisible(true);
Panel.setOpaque(true);
Panel.setLayout(new BoxLayout(Panel, BoxLayout.Y_AXIS));
Panel.setAlignmentX(Component.LEFT_ALIGNMENT);
JLabel lab = new JLabel("Current");
lab.setHorizontalAlignment(SwingConstants.LEFT);
lab.setForeground(Color.WHITE);
lab.setBackground(Color.PINK);
lab.setOpaque(true);
Panel.add(lab,Component.LEFT_ALIGNMENT);
JPanel posPanel = new JPanel();
JScrollPane scrollPane = new JScrollPane(posPanel,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
scrollPane.setPreferredSize(new Dimension(290, 200));
scrollPane.setOpaque(true);
posPanel.setBackground(Color.YELLOW);
posPanel.setPreferredSize(new Dimension(290, 200));
posPanel.setLayout(new BoxLayout(posPanel, BoxLayout.Y_AXIS));
posPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
Panel.add(scrollPane);
return Panel;
}
This is one of the quirks of the BoxLayout (well, quirk to me, but it is a documented expected behavior of the layout), and I'm forgetting off the top of my head why it does this, but I do know of at least one way around it: put your JLabel into a JPanel that uses FlowLayout.LEFT (or LEADING), and add that to your BoxLayout-using container:
JPanel labPanel = new JPanel(new FlowLayout(FlowLayout.LEFT, 0, 0));
labPanel.add(lab);
panel.add(labPanel, Component.LEFT_ALIGNMENT);
Note, that I believe that it has something to do with the JLabel not wanting to expand while the JPanel that encloses it does, but don't quote me on that.
Edit
From the BoxLayout Tutorial:
For a top-to-bottom box layout, the preferred width of the container is that of the maximum preferred width of the children. If the container is forced to be wider than that, BoxLayout attempts to size the width of each component to that of the container's width (minus insets). If the maximum size of a component is smaller than the width of the container, then X alignment comes into play.
You could probably solve this by setting both the JLabel's and the JScrollPane's x-alignment to Component.LEFT_ALIGNMENT. Your current code forgets to set the JScrollPane's x-alignment, and that's where your trouble lies:
scrollPane.setAlignmentX(Component.LEFT_ALIGNMENT);
For example:
import java.awt.*;
import javax.swing.*;
public class Foo2 {
private static void createAndShowGui() {
JLabel topLabel = new JLabel("Top Label", SwingConstants.LEFT);
topLabel.setOpaque(true);
topLabel.setBackground(Color.pink);
JScrollPane scrollpane = new JScrollPane(
Box.createRigidArea(new Dimension(400, 400)),
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.PAGE_AXIS));
topLabel.setAlignmentX(Component.LEFT_ALIGNMENT);
mainPanel.add(topLabel);
scrollpane.setAlignmentX(Component.LEFT_ALIGNMENT);
mainPanel.add(scrollpane);
JFrame frame = new JFrame("Foo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
This results in:
Use constant into Component(Left,Right,Center)
I have a JFrame and a Jpanel over that in which various buttons are placed.so on click of a button I have called a new class which is also having containers placed in a Jpanel.so I want to show that new class panel over the main Jframe panel.How can I do that?
And if we use card layout in it then how can i use that as on click button i have called an object of a new class.
as
Card layout consider each component in a container as card and i want whole Jpanel as a card so is it possible to do that???
Can We do nesting of Jpanels in it?
Please suggest me a right way to do that?
here is SSCCE:
// this is the main class on which i want to use panel of other class
public class mymain
{
JFrame jframe = new JFrame();
JPanel panel = new JPanel();
BorderLayout borderlayout = new BorderLayout();
public mymain()
{
jframe.setLayout(borderlayout);
JMenuBar menubar = new JMenuBar();
jframe.setJMenuBar(menubar);
JButton home_button = new JButton("HOME");
menubar.add(home_button);
jframe.getContentPane().add(panel,BorderLayout.CENTER);
panel.setLayout(new GridBagLayout());
//here used containers over that frame
and call it from main()
}
here is another class to manage category is
public class manageCategory
{
JPanel panel = new JPanel();
GridBagLayout gridbglayout = new GridBagLayout();
GridBagConstraints gridbgconstraint = new GridBagConstraints();
public manageCategory()
{
panel.setLayout(new BorderLayout());
// i have again here used containers placed with grid bag layout
}
}
So now i want that as i click on home button used in mymain class then the panel that is used in manageCategory() should be displayed on the same panel.and when i again click on home button then the mymain panel get displayed.how can i do that???
I would advise you to use a CardLayout for this task.
Updated example with JPanel and "classes":
static class MainPanel extends JPanel {
public MainPanel(final Container frame) {
add(new JButton(new AbstractAction("Click to view next") {
#Override
public void actionPerformed(ActionEvent e) {
frame.add(new NextPanel(), "NextPanel");
((CardLayout) frame.getLayout()).show(frame, "NextPanel");
}
}));
}
}
static class NextPanel extends JPanel {
public NextPanel() {
add(new JLabel("Next page in the card layout"));
}
}
public static void main(String[] args) throws Exception {
JFrame frame = new JFrame("Test");
frame.setLayout(new CardLayout());
frame.add(new MainPanel(frame.getContentPane()), "MainPanel");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setVisible(true);
}
CardLayout is one of possible ways, but there are another options valid or required by most completed GUI
1) BorderLayout, because there only one JComponent can occupate decision area
someContainer.add(myPanel, BorderLayout.CENTER)
revalidate();
repaint();
2) GridBagLayout
before anything you have to get declared GridBagConstraints from myOldComponent layed by GridBagLayout
myContainer.setVisible(myOldComponent);
//or
myContainer.remove(myOldComponent);
myContainer.add(myNewComponent, gbc);
revalidate();
repaint();
You can
JFrame myFrame = new JFrame();
JPanel panel1 = new JPanel();
Panel1.setVisible(true);
myFrame.add(panel1);
JPanel panel2 = new JPanel();
Panel2.setVisible(false);
myFrame.add(panel2);
//Here you setup your panels and your actionlisteners etc and when
//you wish for your second panel to show up just run the code below.
panel1.setVisible(false);
panel2.setVisible(true);
Obviously you first have to add both panels to your Jframe. Panel1 will be at first visible, as it is the one shown by default. Panel2 must be set to be invisible in the beginning.