Forums Register Login

JPanel refresh problem - new content shows only on mouse action

+Pie Number of slices to send: Send
Hello!

I'm trying to change JPanel content after clicking some button in a JFrame.

I use following method to change my panel content:




I used this method in my previous projects and it worked perfectly, but now something strange is happening.
The panel looks as it was empty after clicking the button which should cause the content change. But when I move my mouse over the panel
- the new content (buttons, tables, etc.) is showing (when I move my mouse over the place where the button shoud be, it immediately appears).

I tried revalidate() and repaint() methods but they don't make any difference.

Does anybody know what can possibly cause this effect?
+Pie Number of slices to send: Send
Hi Joan,
Welcome to the Ranch

Why do you want to remove and add panel? There is no need to do that for content change.
Content changes in Swing are be done through the model (which holds the data) and that change will automatically notify the view which can update itself.

Let us know what content is changing in the panel.
+Pie Number of slices to send: Send
Hello!

Maybe I used wrong words to describe what is changing. I have a main window (JFrame) and a panel in it (JPanel).
I also have some options to choose like f.e. books, toys, etc. Each option has its own panel (separate JPanel classes) with the table and buttons.
After choosing some option currentPanel (which is the current panel in main window) shoud change to new panel (f.e books panel, toys panel, etc.).

As I said, it worked in my previous projects that's why I'm so confused right now. It looks like the new panel is refreshing only when I move my mouse over the element of the new panel.
+Pie Number of slices to send: Send
Rather than trying to swap panels in and out I suggest you look at using java.awt.CardLayout.
+Pie Number of slices to send: Send
 

Tony Docherty wrote:Rather than trying to swap panels in and out I suggest you look at using java.awt.CardLayout.



I used CardLayout as you suggested, but the problem stays the same. The content of the panel appears only when I move my mouse over it.
So it's not the problem of the layout...
+Pie Number of slices to send: Send
Can you show the code you have used.
+Pie Number of slices to send: Send
 

Tony Docherty wrote:Can you show the code you have used.







I really appreciate your help.
+Pie Number of slices to send: Send
The method add(String, Component) is obsolete, you should use add(Component, Object). ie:
+Pie Number of slices to send: Send
 

Tony Docherty wrote:The method add(String, Component) is obsolete, you should use add(Component, Object). ie:




Hi again!

I changed the code again just as you suggested but the problem remains the same. The items of my panel appear only when I move my mouse over it.

What can cause this effect? I don't have any mouse listeners added in my project...
+Pie Number of slices to send: Send
You'll need to post an SSCCE so I can run the code and see what is going on.
Self destruct mode activated. Instructions for deactivation encoded in this tiny ad.
a bit of art, as a gift, the permaculture playing cards
https://gardener-gift.com


reply
reply
This thread has been viewed 3003 times.
Similar Threads
Adding listeners to Components
Export to pdf
problem with moving a JWindow
can't add to JPanel after removeAll() is triggered by another swing component
BackgroundPanel.java cannot be placed in BorderLayout.NORTH
More...

All times above are in ranch (not your local) time.
The current ranch time is
Mar 30, 2024 01:25:30.