Java Swing - how to show a panel on top of another panel

Question

I wish to have an internal  non window  dialog to ask for member input  I would like the dialog to be placed centrally on an existing JPanel  I have looked at layeredpanes and these seem unusable due to only having a single layout manager  or no layout manager  across all the panes  I guess I could try to override JLayeredPane and provide a custom layout but this seems extreme  Glass panes don t seem to be appropriate either  How can this be done  Is there no usable concept of z-indexes in Swing    EDIT The reason Layered Panes weren t appropriate was due to the lack of a layout manager per layer  The panel is resizeable  Panel A should stay at 100  of area and Panel B should stay centralized

User · Answer

JOptionPane showInternalInputDialog probably does what you want  If not  it would be helpful to understand what it is missing

User · Answer

I think LayeredPane is your best bet here  You would need a third panel though to contain A and B  This third panel would be the layeredPane and then panel A and B could still have a nice LayoutManagers  All you would have to do is center B over A and there is quite a lot of examples in the Swing trail on how to do this  Tutorial for positioning without a LayoutManager   public class Main       private JFrame frame   new JFrame        private JLayeredPane lpane   new JLayeredPane        private JPanel panelBlue   new JPanel        private JPanel panelGreen   new JPanel        public Main                 frame setPreferredSize new Dimension 600  400            frame setLayout new BorderLayout             frame add lpane  BorderLayout CENTER           lpane setBounds 0  0  600  400           panelBlue setBackground Color BLUE           panelBlue setBounds 0  0  600  400           panelBlue setOpaque true           panelGreen setBackground Color GREEN           panelGreen setBounds 200  100  100  100           panelGreen setOpaque true           lpane add panelBlue  new Integer 0   0           lpane add panelGreen  new Integer 1   0           frame pack            frame setVisible true                           param args the command line arguments             public static void main String   args            new Main               You use setBounds to position the panels inside the layered pane and also to set their sizes   Edit to reflect changes to original post You will need to add component listeners that detect when the parent container is being resized and then dynamically change the bounds of panel A and B

User · Answer

Use a 1 by 1 GridLayout on the existing JPanel  then add your Panel to that JPanel  The only problem with a GridLayout that s 1 by 1 is that you won t be able to place other items on the JPanel  In this case  you will have to figure out a layout that is suitable  Each panel that you use can use their own layout so that wouldn t be a problem   Am I understanding this question correctly

User · Answer

You can add an undecorated JDialog like this   import java awt event     import javax swing     public class TestSwing     public static void main String   args  throws Exception       JFrame frame   new JFrame  Parent        frame setDefaultCloseOperation JFrame EXIT ON CLOSE       frame setSize 800  600       frame setVisible true        final JDialog dialog   new JDialog frame   Child   true           dialog setSize 300  200       dialog setLocationRelativeTo frame       JButton button   new JButton  Button        button addActionListener new ActionListener            Override       public void actionPerformed ActionEvent e            dialog dispose                        dialog add button       dialog setUndecorated true       dialog setVisible true

User · Answer

There s another layout manager that may be of interest here  Overlay Layout Here s a simple tutorial  OverlayLayout  for layout management of components that lie on top of one another  Overlay Layout allows you to position panels on top of one another  and set a layout inside each panel  You are also able to set size and position of each panel separately    The reason I m answering this question from years ago is because I have stumbled upon the same problem  and I have seen very few mentions of the Overlay Layout on StackOverflow  while it seems to be pretty well documented  Hopefully this may help someone else who keeps searching for it

User · Answer

I just thought that I d add that there is a notion of Z-order in Swing  see  java awt Component setComponentZOrder  1   which affects the positions of a component in its parents component array  which determines the painting order   Note that you should override javax swing JComponent isOptimizedDrawingEnabled to return false in the parent container to get your overlapping components to repaint correctly  otherwise their repaints will clobber each other   JComponents assume no overlapping children unless isOptimizedDrawingEnabled returns false    1   http   java sun com j2se 1 5 0 docs api java awt Container html setComponentZOrder java awt Component  int

[java] Java Swing - how to show a panel on top of another panel?

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