My first panel's layout is BorderLayout and my second panel's layout is GridBagLayout. I don't know how to show them both at the same time.
I already tried adding two panels to on another panel.
Adding both to another panel is the way to go! But you have to make the right choice of LayoutManager for this "parent" panel. Let me give you an example:
The JFrame's content pane (where you add all your Components to) can be setup with a LayoutManager of your choice. See this runnable example, which creates two JPanels of 100x100 pixels in different colors. The panels are using the LayoutManagers you mentioned, but the main content pane of the JFrame is set to a BoxLayout (horizontal, but you can also set it to vertical!).
You can do this to any other panel, too. A panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS)); is enough. The below example just uses the content pane, but you can adapt it to your needs:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagLayout;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TwoPanels extends JFrame {
private static final long serialVersionUID = 1L;
private static final Dimension DEFAULT_DIMENSION = new Dimension(100, 100);
public static void main(String[] args) {
new TwoPanels();
}
public TwoPanels() {
//create panel 1
JPanel panel1 = new JPanel(new BorderLayout());
panel1.setPreferredSize(DEFAULT_DIMENSION);
panel1.setBackground(Color.RED);
//create panel 2
JPanel panel2 = new JPanel(new GridBagLayout());
panel2.setPreferredSize(DEFAULT_DIMENSION);
panel2.setBackground(Color.GREEN);
//set content pane layout
setLayout(new BoxLayout(this.getContentPane(), BoxLayout.X_AXIS));
//add to content pane
add(panel1);
add(panel2);
//setup and display window
pack();
setVisible(true);
}
}
It looks like this:
EDIT: It's a little unclear from your question that you actually want to stack overlaying panels. You might find what you need here: https://docs.oracle.com/javase/tutorial/uiswing/components/layeredpane.html
Related
I want two Panels to be added here within one frame, I want some buttons and text fields on the right side there to edit the drawing panel class but I can't figure out how to add GUI components to panel2. Whenever I try to add GUI components to panel2, it just doesn't work how it would work normally and I don't understand why.
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Main {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setTitle("WaferMap");
frame.setSize(1286, 829);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setVisible(true);
Container contentPane = frame.getContentPane();
contentPane.setLayout(new BorderLayout());
DrawingPanel panel1 = new DrawingPanel();
JPanel panel2 = new JPanel();
frame.add(panel1, BorderLayout.WEST);
panel1.setPreferredSize(new Dimension(1080, 800));
final JButton button = new JButton();
panel2.add(button, BorderLayout.EAST);
button.setBounds(50,50,100,50);
frame.add(panel2, BorderLayout.EAST);
panel2.setPreferredSize(new Dimension(200, 800));
}
}
This is the main, I have another class called drawingPanel with a paintComponent in it.
Don't use setPreferredSize(). It is the job of the layout manager to calculate the preferred size of the panel based on the rules of the layout manager and the preferred size of the components added to the panel.
Don't use setSize(). Instead use pack(). The frame will be sized based on the preferred size of all components added to the frame.
The real problem is that by default a component has a size of (0. 0) so there is nothing to paint. It is the job of the layout manager to give the component a size/location to the component. The problem is that you made the frame visible before you added the components to the panel, so the layout manager was never invoked. So the solution is that the pack() and setVisible(true) statements should be invoked AFTER all components have been added to the frame.
Note, the tutorial also has a section on Custom Painting that you should be reading so you implement the painting properly to make sure your DrawingPanel has a preferred size.
I have a JPanel with layout set to null and the background is white. Then I added that JPanel to JScrollPane.
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
public class TestJScollPane extends JPanel {
private static final long serialVersionUID = 1L;
public TestJScollPane() {
initUI();
}
private void initUI()
{
JScrollPane scrollPane = new JScrollPane();
scrollPane.getViewport().setBackground(Color.GRAY);
scrollPane.setBounds(1, 1, 200, 200);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
setBorder(BorderFactory.createEtchedBorder(Color.GREEN, Color.MAGENTA));
setBackground(Color.WHITE);
setLayout(null);
JFrame frame = new JFrame();
scrollPane.setViewportView(this);
frame.add(scrollPane);
frame.setLayout(null);
frame.setVisible(true);
frame.setSize(800, 500);
frame.getContentPane().setBackground(Color.BLACK);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(30,30);
}
public static void main(String[] args)
{
new TestJScollPane();
}
}
My scenario is I have a zoom tool that if I zoom out the JPanel and all its shapes that were painted were scaled using AffineTransform. So I expect that if I zoom out, the background of JScrollPane was color gray but the actual was color white.
Apologies, I added a sample. Actually, this is not the actual code I created this so that I can provide a sample for you guys to help me.
I set the preferred size of JPanel to 30x30 so I expect that the background of JScrollPane will become visible but it was not.
Thanks in advance for any help.
By default the panel is sized to fit the viewport so you will not see the background of the viewport.
You need to implement the Scrollable interface of your JPanel to tell the scroll pane you want the panel displayed at its preferred size.
Or, instead of implementing the Scrollable interface yourself you can use the Scrollable Panel which, by default, will display the panel at its preferred size.
Changes to your code would be:
ScrollablePanel panel = new ScrollablePanel();
panel.setPreferredSize( new Dimension(30, 30) );
panel.setBorder(BorderFactory.createEtchedBorder(Color.GREEN, Color.MAGENTA));
panel.setBackground(Color.WHITE);
//panel.setLayout(null);
scrollPane.setViewportView(panel);
//scrollPane.setViewportView(this);
Change:
scrollPane.setViewportView(this);
To something like:
JPanel centerPanel = new JPanel(new GridBagLayout());
centerPanel.add(this);
scrollPane.setViewportView(centerPanel);
A GridBagLayout (by default, unless configured otherwise) will respect the preferred size of the child components and won't stretch them to fill the 'cell'. A scroll pane on the other hand, will stretch the content to (at least) fill the visible area.
Result:
But seriously, drop the use of null layouts. If the effect cannot be achieved using an existing layout (inbuilt or 3rd party) or a combination of layouts, it must have such esoteric positioning constraints that it deserves a custom layout manager.
I'm trying to align a JLabel to the right in a JPanel. I'm adding a JTabbedPane, a JPanel which contains my JLabel and JTextArea to a main JPanel.
I have searched SO and tried some methods like setAlignmentX, setHorizontalAlignment(SwingConstants.LEFT) and nested containers to no avail.
Here's my code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class LabelProblem
{
public static void main(String[] args)
{
JFrame frame = new JFrame("Label Problem");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel Main = new JPanel();
Main.setLayout(new BoxLayout(Main, BoxLayout.Y_AXIS));
JPanel ComponentPanel = new JPanel();
JLabel label = new JLabel("Sample Text");
label.setHorizontalAlignment(SwingConstants.LEFT);
label.setBorder(BorderFactory.createLineBorder(Color.BLACK));
label.setAlignmentX(Component.RIGHT_ALIGNMENT);
ComponentPanel.add(label);
JTabbedPane Tab = new JTabbedPane();
Tab.add("Document 1", new JPanel());
Main.add(Tab);
Main.add(ComponentPanel);
JTextArea Area = new JTextArea(10,10);
JScrollPane Scroll = new JScrollPane(Area);
frame.add(Main);
frame.add(Scroll, BorderLayout.SOUTH);
frame.setSize(450,450);
frame.setVisible(true);
}
}
How can I align my JLabel to the right?
Thanks!
So, the place of that label is determined by the layout of ComponentPanel. Since you didn't specify any layout it is using the default FlowLayout with a CENTER alignment. Assuming that you are ok with a FlowLayout it is a mere question of setting the alignment of the LEFT since this is possible with this layout.
Here's the code with the fix, however I suspect that as you put more elements to the ComponentPanel you will want to use another layout since FlowLayout is more adequate for menus and the like and not for displaying the main content.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.FlowLayout;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
class LabelProblem
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
initGUI();
}
});
}
public static void initGUI()
{
JFrame frame = new JFrame("Label Problem");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel main = new JPanel();
main.setLayout(new BoxLayout(main, BoxLayout.Y_AXIS));
JPanel componentPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
JLabel label = new JLabel("Sample Text");
label.setBorder(BorderFactory.createLineBorder(Color.BLACK));
componentPanel.add(label);
JTabbedPane Tab = new JTabbedPane();
Tab.add("Document 1", new JPanel());
main.add(Tab);
main.add(componentPanel);
JTextArea area = new JTextArea(10, 10);
JScrollPane scroll = new JScrollPane(area);
frame.add(main);
frame.add(scroll, BorderLayout.SOUTH);
frame.setSize(450, 450);
frame.setVisible(true);
}
}
Result:
Note: I also changed the variable names to follow the java style convention: variable names should start with lower case to differenciate them from clases names, starting in upper case.
One simple approach is to set the label's horizontalAlignment to JLabel.RIGHT in the constructor.
import java.awt.*;
import javax.swing.*;
class LabelProblem {
public static void main(String[] args) {
JFrame frame = new JFrame("Label Problem");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridLayout(0, 1));
JTabbedPane tab = new JTabbedPane();
tab.add("Document 1", new JPanel());
frame.add(tab);
JLabel label = new JLabel("Sample Text", JLabel.RIGHT);
frame.add(label);
JTextArea area = new JTextArea(10, 10);
JScrollPane scroll = new JScrollPane(area);
frame.add(scroll);
frame.pack();
frame.setSize(450, 450);
frame.setVisible(true);
}
}
I think it may be a matter of you not actually setting layouts where you imagine you're setting layouts.
You have a JPanel with a vertically oriented BoxLayout (Main) enclosing another JPanel with default layout (ComponentPanel), finally enclosing your label. The reason why your label can't be pushed to the right is because is already is pushed to the right within it's enclosing container. If you set a colored border around ComponentPanel, you'll see what I mean -- it only occupies the same amount of space as the JLabel, giving the JLabel nowhere to move.
You need to set a layout and constraints for your intermediate ComponentPanel, allowing it to horizontally fill its parent container so that the label has someplace to go.
You haven't really specified how your layout is supposed to look, but if you change the layout on Main to X_AXIS, your label will pop over to the left (as will its parent container). Without knowing what you're really trying to do, I can't say much more.
I would however, suggest you throw your BoxLayout away entirely and look into using GridBagLayout, which gives you a high level control over your UI. GridBagLayout isn't the most concise construct, but that's the price of control.
I have this incredibly easy task of wanting a nice centered JPanel inside another JPanel. The parent is set to 900, 550, and the child should be approximately 200,400 or so.
To do this, I thought giving the parent a BorderLayout and then setting the setPreferredSize(200, 400) of the child. This child would be in the CENTER. Two empty JPanels would be on the EAST and WEST. Of course this did not work. Giving the two sidepanels a setPreferredSize() of course DID work. Problem with this is that narrowing the Frame causes the center pane to go away.
Here's some sample code that should give show the issue:
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Component;
import java.awt.Dimension;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Temporary {
public static Temporary myObj = null;
private JFrame mainFrame;
public void go(){
mainFrame = new JFrame("Swing");
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setPreferredSize(new Dimension(900,550));
JPanel mainCards = new JPanel(new CardLayout());
mainCards.add(loginLayer(), "Login");
mainFrame.setContentPane(mainCards);
mainFrame.pack();
mainFrame.setLocationRelativeTo(null);
mainFrame.setVisible(true);
}
public JPanel loginLayer(){
JPanel masterPane = new JPanel(new BorderLayout());
JPanel centerPane = new JPanel();
centerPane.setLayout(new BoxLayout(centerPane, BoxLayout.Y_AXIS));
centerPane.setPreferredSize(new Dimension(100,200));
JLabel label = new JLabel("Swing is overly");
label.setAlignmentX(Component.CENTER_ALIGNMENT);
centerPane.add(label);
JButton button = new JButton("complicated");
button.setAlignmentX(Component.CENTER_ALIGNMENT);
centerPane.add(button);
JTextField textField = new JTextField(10);
centerPane.add(textField);
JPanel filler = new JPanel();
JPanel filler2 = new JPanel();
masterPane.add(filler, BorderLayout.WEST);
masterPane.add(centerPane, BorderLayout.CENTER);
masterPane.add(filler2, BorderLayout.EAST);
return masterPane;
}
public static void main(String[] args){
myObj = new Temporary();
myObj.go();
}
}
BorderLayout will, by it's nature, give as much of the available space as it can to the CENTER component. This is how it's designed.
If you want the component to be centered within the parent container, BUT maintain it's preferred size, you should consider using a GridBagLayout instead. Without any additional constraints, this should achieve the result you're after
For example...
public JPanel loginLayer(){
JPanel masterPane = new JPanel(new GridBagLayout);
JPanel centerPane = new JPanel();
centerPane.setLayout(new BoxLayout(centerPane, BoxLayout.Y_AXIS));
JLabel label = new JLabel("Swing is overly");
label.setAlignmentX(Component.CENTER_ALIGNMENT);
centerPane.add(label);
JButton button = new JButton("complicated");
button.setAlignmentX(Component.CENTER_ALIGNMENT);
centerPane.add(button);
JTextField textField = new JTextField(10);
centerPane.add(textField);
masterPane.add(centerPane);
// Add additional borders to providing padding around the center pane
// as you need
return masterPane;
}
I would also avoid actively setting the preferred size of component in this way, as it's possible that the components you're adding to it will exceed your expectations, instead, make use of things like EmptyBorder (for example) to add additional white space arouond the component and it's contents
In Java Swing, you generally want to avoid creating a bunch of statically positioned items with preferred sizes and absolute positions, because things get weird with resizing (as you've noticed). Instead you want to rely on the fluid LayoutManagers. There is an excellent tutorial here. Or, if you want to supply a mock-up of some sort to show the actual UI you are trying to create, I could provide some more feedback.
I have a JScrollPane (with both scrollbars optional (should not cause the problem)
Inside of the ScrollPane is a panel with BoxLayout and X_Axis - align. (it contains arbitrary number of Panels with fixed (prefference)Size.
The Problem is that the ScrollPane will be much wider than necessary (Horizontal Scrollbar scrolls through "grey screen").
With Y_Axis align it works as it should.
Relevant code:
final JPanel forSpecific = new JPanel();
final JScrollPane scrollSpecific = new JScrollPane(forSpecific,
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
forSpecific.setLayout(new BoxLayout(forSpecific,BoxLayout.X_AXIS));
I have no idea whats the poblem and did not find any solution...
EDITED: sry it took some time. The original code was to complex to extract some sscce.. i wrote a test-class. This example works coorect.. but i dont know whats different.. package getdata;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
public class Sscce {
public static void gui(){
final JFrame rootframe = new JFrame("Time Series Mining");
final JPanel mainPanel = new JPanel(new BorderLayout());
rootframe.setSize(new Dimension(400,400));
rootframe.setContentPane(mainPanel);
mainPanel.setLayout(new BorderLayout());
JPanel center=new JPanel(new GridLayout(2,1));
JPanel forSpecific=new JPanel();
forSpecific.setLayout(new BoxLayout(forSpecific, BoxLayout.X_AXIS));
JPanel test1 = new JPanel();
test1.setPreferredSize(new Dimension(1000,1000));
forSpecific.add(test1);
test1.setBackground(Color.white);
final JScrollPane scrollSpecific = new JScrollPane(forSpecific);
center.add(scrollSpecific);
rootframe.add(center, BorderLayout.CENTER);
rootframe.setVisible(true);
}
}
//final JScrollPane scrollSpecific = new JScrollPane(forSpecific,
// ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
// ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
final JScrollPane scrollSpecific = new JScrollPane(forSpecific);
Not the problem but the "scrollbar as needed" is the default. You don't need to specify this.
Inside of the ScrollPane is a panel with BoxLayout and X_Axis - align. (it contains arbitrary number of Panels with fixed (prefference)Size.
What is a fixed size?
the "main" panel added to the scrollpane
the "child" panels added to the main panel
In any case the size should not be fixed, the layout manager should determine the preferred size. Or if you are creating a custom component then you should override the getPreferredSize() method to return the proper size so the layout manager can do its job.