I have been working on a series of JPanel and I wanted to add a JFrame from another class to one of my panels. Can this be done.
No, you cannot add any Window to another component, doing so results in a RuntimeException. What you can do is add the contentPane from the JFrame to your JPanel.
Related
I am working with a JFrame Gui, and I have not found a way to change the background of a JLabel using the event handler actionlistener. The main problem is that I have a JPanel created with 4 JLabels inside. I am unsure why I'm not able to use the JLabel variables that are inside the JPanel container. I've tried creating a field for the JLabel, but it returns null when I try to use the .getBackground() method. I've also tried getting the components of the JPanel using a for loop, and changing the labels through that. So far nothing, hopefully this question makes sense, please help me understand this.
https://i.stack.imgur.com/Hnoj5.png
This image shows the refactored method that has my JPanel container with its 4 JLabel components.
https://i.stack.imgur.com/Gw7Xs.png
This image shows the actionlistener part of my code.
why don't you declare a jframe first? Example
JFrame frame = new JFrame();
and then you create a JPanel after that.
JPanel panel = new JPanel();
and then add your jlabel and stuff in the jpanel and then that is when you call your jframe.
example
frame.add(panel);
i have the same project before the only difference about our problem is that I forgot to use the JPanel, but I have a JFrame. Create a JFrame first.
I'm trying to reuse a JPanel inside a JDialog instead of replicating another JPanel that has the exact features. I tried removing and adding the component to the JDialog, but it's not working as I expected. What is the recommended approach to this issue?
write a class "myFeaturesJPanel" that extends jPanel having the needed features. then just add a own instance to your popUpPanel and your original panel
I have a JPanel that is used to draw the menu for my game and a JFrame that it is added to, I have to add the menu to the middle of the frame so that it will look just as good on a higher resolution as on a lower. I have tried frame.add(menu, BorderLayout.CENTER) and menu.setLocation(windowW / 2, windowH / 2) but none of these options work. What is the easiest way to accomplish this on?
Position a JComponent at the center of a JFrame
use GridBaglayout without override GridBagConstraints, or BoxLayout then JComponent will be placed into center and isn't resizable with container
You need to call the method frame.setLocationRealtiveTo(null) or as parameter the window where the new frame should be referenced to.
EDIT: Think I understood it wrong. You want to add a component to a JFrame to the middle of all. Add instead a JPanel to the JFrame and add the component to the JPanel (BorderLayout.Center).
Once a JPanel has been instantiated and added to a visible JFrame, how do I add a new JComponent to it and update the display to show said new JComponent?
Original Question:
How to add JComponent to JPanel after JPanel has been added to a JFrame. I think I may have to extend JPanel and possibly override paintComponent().
JPanel.add() should work fine. If the frame is already visible, then call:
validate();
repaint();
Also, depending on the size and layout you may need to repack the frame with pack().
It is easier if you can post SSCCE with your question.
I don't know if I understand your question, there should be no problem adding any JComponent to a JPanel, befor or after it has been added to a JFrame:
JPanel panel = new JPanel();
frame.setContentPane(panel);
// sometime later
panel.add(new JLabel("JLabel is a JComponent"));
Maybe if you post your code, the question will be somewhat more clear.
I generate a bunch of JPanels and then pass them into a class that extends JFrame. How do I add an indefinite number of JPanels to this JFrame. I was also reading about JScrollPane should I incorporate this somehow into the design?
Example Code:
class foo extends JPanel
{
//generate JPanels
}
class bar extends JFrame
{
//grab some amount of foo classes and put them into this JFrame and show it
}
Also is there anything I need to watch out for when showing this JFrame?
Thanks
How do I add an indefinite number of JPanels to this JFrame?
CardLayout, JDesktopPane/JInternalFrame, JTabbedPane, JScrollPane - there are a number of options.
Also is there anything I need to watch out for when showing this JFrame?
(shrugs)
Construct and show GUI components on the EDT.
pack() the GUI before setting the position and calling setVisible(true).
Don't rely on the default layouts of content panes.
Don't implement custom painting in a top level container.
..
JFrame -> JScrollPane -> fathers JPanel then you'll decide which of LayoutManager will lay your bunch of JPanels, by defalut FlowLayout, don't forget to play with PreferedSize for childsPanels