I would like to add components (JButton and JSpinner) to a JPanel which was created using Netbeans GUI builder. This panel uses GroupLayout, and I can't seem to use add() to add a component. Is there any way to either add something to a panel which has a GroupLayout, or change this panel to a FlowLayout?
It's definitely not an easy thing to do. It depends on where you want to add those components. I usually reserve an empty placeholder JPanel with GUI builder, and then add components to that panel, using whatever layout I want. However, this only works when you want to add components in one place. If they are scattered around the GUI, it may be not that easy.
Another options is to migrate to manual GUI creation, possibly using Netbeans-generated code as a starting point. But depending on how complex your GUI is, it may be a tedious work.
There is an option if you right-click the JPanel to change it to a FlowLayout (Set Layout). This fixed all the problems I was having.
Related
I am creating simple application in java - Eclipse - WindowBuilder Editor. JFrame`s contentPane has JGoodies FormLayout in which I have to place 3 or 4 Panels - depending on mode.
It is proper way to make if construction that decides if content pane will be divided 1x3 or 1x4(facilitation because between all I use relatedgaps and so on..)?
I am not sure if this is good approach but I do not know how can I do this in other way than if construction. It has to be practical and flexible approach - to handle resizing the window, et cetera..
Common approaches for dynamic layout include these:
Use revalidate(), and possibly repaint(), to layout a Container again after adding or removing components, as shown here.
Replace the layout and validate() the Container, as shown here.
Use CardLayout to replace one panel with another, as shown here and here.
I have developed a simple music player in Java which can play any given playlist or simple mp3 song.
For now i have worked all things out in plain JPanels. GUI doesn't look neat.
I need to revamp the GUI using tabbed pane. How this can be achieved using existing JPanels without affecting current functionality?
Also, i am not able to figure out shall i go for Tabbed Pane or Card Layout?
http://docs.oracle.com/javase/tutorial/uiswing/layout/card.html
Because a tabbed pane provides its own GUI, using a tabbed pane is simpler than using the CardLayout class.
"Also, i am not able to figure out shall i go for Tabbed Pane or Card Layout?"
It really depends on your preference of the look of your program. The two layouts perform very similarly, though CardLayout is a little bit more code, though at all not difficult. If you don't want the tab look, which I don't see why you would, for a game, then go with CardLayout
"How this can be achieved using existing JPanels without affecting current functionality? "
You need to create separate JPanel for each containment of whatever components you want in each tab. Then just add those JPanel to the JTabbedPane. It shouldn't break any functionality, just the look. Components from another panel should not be affected, you just won't be able to see any changes made, unless that other panel is in view.
If you want to go with CardLayout you can look at the tutorial
I am somewhat new to the whole java swing scene, and I just want some clarifications due to a slight confusion I have. I have learned about orientation and buttons and all the basics. Also pointing to some good (non oracle) tutorials will be highly appreciated.
As far as I understand, we have our JFrame which is a window.
Then our JFrame consists of ContentPane, which I am using a container for.
Container content = frame.getContentPane();
Now that I have this container, can I add more containers within those containers? Let's say that I would like to have different parts that do different things, and for that I would like to create classes and such that each handle their own containers?
So what I am asking for is, how does one go about storing different content within the container? What is the proper way to go about it?
An example I would give is let's say I have a scoreboard (for soccer) that is on the top part of the window, on the middle part of the window there is some work related business stuff, and on the bottom part of the window I have some textbox that does its thing with a few buttons.
Sorry if this question is stupid, I am just trying to learning swing, and want to know proper way to arrange different components within the window.
Yes, you can. Create an instance of JPanel and add your components to it, and then add them to the frame's content pane using a string:
JPanel panel = new JPanel();
//code to add stuff to the panel
frame.getContentPane().add("Center", panel); //"North", "South", "East", "West", or "Center"
I have search on internet and found a lot of information about drawing in Java. But when I add new JFrame class in Netbeans then I cannot add a own JPane in the JFrame. Hopefully somebody can help me with this issue/question.
Drawing the JPane is possible when I make a new JFrame in a class, but I would like to use the design view in Netbeans. That is not possible when I make a new JFrame.
I look forward to receiving an answer.
It looks like you made a JFrame instance yourself, and then tried to add a JPane(l) to it using NetBeans swing builder. This wont work. Try creating a new swing class using the swing builder and let netbeans make the Jframe.
Also, make sure you set a correct layout for your JFrame.
Also, like BenCole said, I think you mean a JPanel, not a JPane.
As an alternative, create your own top level container and add your designer panel to its content pane. Here's a simple example. In this way you can limit the use of the designer to a single panel, while you explore other layouts.
In my Netbeans code I have JPanels and JDialog which are driving me crazy at times. Some of the controllers on these containers decide not to show up or automatically change size even though I have set up both their size and contents within the code and through using the IDE properties. For instance some of my jButtons on a certain JPanel does not show its text label or the sizes of some of my text field change.
Any solution to this would be grately appreciated!
When you create GUI using the NetBeans IDE wizards the Layout manager attached with JPanel and JFrame is GroupLayout and it works as expected. It keep the size of your JPanel and JFrame as you have specified.
Now if you change the LayoutManager of the JPanel or JFrame then you are on your own. You must know the consequences of changing the LayoutManager and update / add the required code to make the code to run as expected.
I will suggest you to keep the default LayoutManager as GroupLayout if you want to get what you see in the NetBeans component designer.
Unfortunately you did not provide any code snippet that can show your problem. But let me assume that you are confused with layout behavior. Typically we use Layout manager and delegate to it the responsibility of placing and re-sizing the graphical elements. Layout manager does it work when the parent element is being painted, i.e. during execution of method paint() that happens asynchronously and may be caused by various events (e.g. changing focus, re-sizing of window etc).
In this case all your attempts to change size of specific element by calling its setSize() could be overridden by layout manager that decides to change size of the same element differently.
So, if my assumption is correct learn to use layout managers and ask more specific questions if you have any difficulties with them.