Deleting a JPanel inside a JPanel... inside a JPanel - java

I am trying to make a slideshow-like application in Java using NetBeans.
I have a JFrame (the main window) and inside it are two buttons (back and next) for navigation, and a JPanel (mainPanel) which acts as holder of the 'slides' of the app. I am also using custom JPanel (SlidePanel) objects which are then placed inside the mainPanel. Some of these SlidePanel objects have JPanels within them.
Now, I've been able to place these SlidePanel objects inside the mainPanel and also navigate through them (for example, if I click the next button, SlidePanel 1 would be replaced by SlidePanel 2, or if I click the back button, SlidePanel 2 would be replaced by SlidePanel 1.) I've done this by using the removeAll(), revalidate(), and repaint() methods.
The problem starts here. The third SlidePanel object contains a JPanel inside it. What happens when you get to the third SlidePanel, it works fine. But from there, if you click the back button (which takes you back to SlidePanel 2), the JPanel from SlidePanel 3 remains on the screen, with the components inside SlidePanel 2 adjusted to fit the mainPanel.
What should I do to fix this?
EDIT: Thank you very much to all those who answered. I tried CardLayout on a dummy project and it worked fine. Now, all I have to do is add it to the original one. Thanks again. :)

I suggest to use CardLayout for that, rather as add and remove JPanels on the Runtime example for CardLayout and together with your idea could be here

I suggest you use a different layout manager (e.g. CardLayout); let the layout manager worry about juggling it's components.

Related

Open elements and struct of jFrame in another like a menu

i have 5 jFrames in my java project. And i want to make like a Main Menu.
I mean, i want that the program starts with a jFrame and when i click a button insteand of open the jFrame, all the elements like labels, buttons and tables are being shown in my principal jFrame.
And if i click other button the main frame will clean and charge other jframe.
It is possible? im programming with java jdk 8 and netbeans.
Thanks
Edit:
I think who marked duplicate didn't understand my question. I don't want to open or close the frame, or other frames, I want to load the structure and components of several in the same frame. Please read my question before you start complain that is duplicated
i have 5 jFrames in my java project.
And that's a problem.
And i want to make like a Main Menu. I mean, i want that the program starts with a jFrame and when i click a button insteand of open the jFrame, all the elements like labels, buttons and tables are being shown in my principal jFrame. And if i click other button the main frame will clean and charge other jframe.
Yes this can be solved by getting the contentPane (usually a JPanel) from the JFrame whose content you want to display within the currently displayed JFrame, and making it the contentPane of the displayed JFrame, for example:
// create the new JFrame, the one whose content you wish to display
NewJFrame newJFrame = new NewJFrame();
// get its contentPane
Container newContentPane = newJFrame.getContentPane();
// add this content pane into the displayed JFrame
displayedJFrame.setContentPane(newContentPane);
// revalidate and repaint the JFrame so that its new data is well displayed
displayedJFrame.revalidate();
displayedJFrame.repaint();
// displayedJFrame.pack(); // and you might need to do this if sizes are way off
But this extra gymnastics is bulky, prone to bugs and unnecessary. You are painting yourself in a corner by having your class extend JFrame, forcing you to create and display JFrames, when often more flexibility is called for. In fact, I would venture that most of the Swing GUI code that I've created and that I've seen does not extend JFrame, and in fact it is rare that you'll ever want to do this. More commonly your GUI classes will be geared towards creating JPanels, which can then be placed into JFrames or JDialogs, or JTabbedPanes, or swapped via CardLayouts, wherever needed. This will greatly increase the flexibility of your GUI coding.
For this situation what I recommend is that you do that, that your GUI classes create JPanels, and that you add the ones that you want to swap to a JPanel that uses a CardLayout. And then whenever you want to show a different "card", call show(...) on the CardLayout object, passing in the JPanel that uses it, as well as the String key that was used when adding the "card" JPanel to the CardLayout-using JPanel. This is all well-explained in the CardLayout Tutorials.
Other useful links:
For rationale on why to avoid manually swapping please see: What's so special about CardLayout vs manual adding/removal of JPanels?
For using a CardLayout to help control a "multi-page" application with multiple classes, please see: How to Integrate Multi-page Java Desktop Application from Multiple GUI Classes

How to create dynamic wizard?

I am making project with GUI. The thing is, that I have a button and what I need to do is that after clicking this button I need to change Frame layout. For example, like when you are installing some program and you click "next" button, the Frame layout changes and you can see some different content. Basicly, dynamic wizard.
I have tried use another Frame, but it opens in another window and that is not what I want. I want to open it in the same window.
Another thing I have tried is set visibility of these components I don't want to be displayed to false, but I find it unprofessional and it is overlook in making a desing, when I have components over themselfs.
So do you guys have any idea? Thank you.
Most of the times for a wizard like GUI, you should have JFrame and a set of JPanels. In each step you can pass the shared data as constructor arguments to each panel, and when you are making one of them invisible and make another one visible, you can get some date from the previous step panel and pass it to the next step panel(if needed).
It is very common that your panels extend the JPanel and have some argument in their constructor(s). You use these data for initializing your panel and managing the state of the overall progress.
There is no a total plan for all situations. So you should decide what to do which is best fit for your case.
Try not to have multiple JFrames.
Hope this would be helpful.

Assigning a different (new) JPanel to a JTabbedPane at run time

I have a JTabbedPane (say myTabPane) having one tab (lets take only one tab for clarity sake). While creating the JTabbedPane, I added a JPanel (say panel_A) to this tab. I have a button on this JPanel. The tab displays my JPanel perfectly with the button on it. So far so good.
I have defined a listener on the button which creates an instance (say panel_B) of another class extending JPanel. This JPanel has got a different set of components on it. I want panel_B to super-impose panel_A. That is, JTabbedPane's tab should show panel_B and hide panel_A.
Please note that I am able to display panel_A OR panel_B when I "bind" the respective panel (one of them) to the tab during creation of the JTabbedPane. However, I want a selective display (or binding, whichever is possible) of only one of the panels with a button-click (ie. at runtime).
How can this be achieved?
Thank you!
This will do what you need:
myTabPane.removeTabAt(0);
myTabPane.addTab("B", panelB);

how to start, developing swing based application with few panels with next buttons for each

I'm new to java.I'm creating a swing based UI. I've created 2 frames, each one in separate .java file inside same package.
These two frames represents 2 screens (panels) of application. When Next button in first frame is clicked, it should move to second frame.
When I checked, these two classes are having main method, I think it should be correct way for creating applications. there should be only one main method.
When Next is clicked, I'm trying to make setVisible(false) for main panel of first frame and setVisible(true) for main panel of second frame. But this cannot be done, since the panels within a class are private. Any resolution for the above problem?
As I'm beginner, Can somebody suggest me in how to start up with these kind of applications? what are the guidelines that need to be followed? And please help me in finding documentation related to starting up with the development of such applications.
After going through the answers, My comments are:
I used the following code to go to next panel from first panel, but didn't worked.
private void gotoNextPanel(){
// jPanelFirstScreen.setVisible(false);
JPanelSecondScreen jpanelSecondScreen= new JPanelSecondScreen();
jpanelSecondScreen.setVisible(true);
UpgradeUtilityGUI upgradeUtilityGUI = new UpgradeUtilityGUI();
upgradeUtilityGUI.removeAll();
validate();
repaint();
// upgradeUtilityGUI.add(jpanelSecondScreen);
upgradeUtilityGUI.getContentPane().add(jpanelSecondScreen, "card2");
jpanelSecondScreen.setVisible(true);
validate();
repaint();
}
I'm using netbeans, and 've added two panels to the cardlayout of frame. And when I use the above code to change panels, Nothing is happening, the first panel is still appearing. Can somebody tell me, how to write code for moving from one panel to another when both the panels 've been added to cardlayout of jFrame ?
Use a CardLayout, as shown here (and one frame) as mentioned by others.
When Next is clicked, I'm trying to make setVisible(false) for main panel of first frame and setVisible(true) for main panel of second frame. But this cannot be done, since the panels within a class are private. Any resolution for the above problem?
Make the panels public access level and they will be available from other packages.
One problem in that code snippet is implied by the line:
UpgradeUtilityGUI upgradeUtilityGUI = new UpgradeUtilityGUI();
It goes out of scope before ever being added to a container. Also, their should be no need to remove anything when adding a new card to the layout, and no need to call repaint().
If your application is as simple as having only two panels you shouldn't create two JFrames. You should create a JFrame with two JPanel each of them contains the neccessary information for you. If you are ready with your first panel you can call setVisible(false) on it, and call setVisible(true) on the 2nd frame. It is the one of the most easy-to-understand solution.
But, it only depends on you if it is good for you or you would like to use some more detailed solution.
Don't use two or more JFrames, nor with separated and compiled Jar files, this is road to the hell, better would be look at CardLayout,
What you should do is have a single JFrame for the application, then you add and remove JPanels as you want to move between screens.
Each of your JPanels should basically have the following...
1. A JButton called "Next"
2. A ButtonListener for each button, that tells the JFrame to load panel2, panel3, etc.
As part of the ButtonListener, you basically just want to call something like JFrame.removeAll() to remove the existing panel, then JFrame.add(JPanel) to add the next panel.
By having 1 JFrame, you also only have 1 main() method.

JFrame in a Java desktop application

I am developing a desktop Java application with GUI implemented through Swing. I have made a JFrame and have added three buttons on it - Add, Edit, Delete.
Now I want that whenever a user clicks on any of the button, the content specific to that button appears besides those three buttons.
So how to implement this? Should I need to add a JPanel besides those three buttons and then add the content specific to the button to that JPanel?
So far, I have taken a JFrame and have added 3 buttons on it. That's it.
For the Add button, I want to add some buttons and textfields to add information to the database.
For the Delete button, I want to add some buttons to find records in the database based on the information entered through the user in the textfield that appears when the user clicks on the Delete button.
Similar type of content for Edit button.
So how to implement this. Should I need to add a JPanel besides those three buttons and then add the content specific to the button to that JPane
That would be fine. When you push the button, you can call JPanel.removeAll() to remove all the controls currently in the control, and then just do the layout again, specific to whatever button you pushed.
If you have custom swing controls, just add your custom control the JPanel using a BorderLayout and putting in the center.
Another option would be to use a CardLayout, and flipping between the cards when a user presses one of the buttons. If the layouts for the buttons never change, that would probably be a better way to do it. Obviously if the content changes between button presses, you'll need to redo the layout each time.
Either of Chad's or Alex's answers would be fine. You will probably need to call a combination of revalidate() and repaint() on the panel that you've changed, as in the past I've noticed Swing doesn't always like panels being swapped out.
Also, have you considered using a JTabbedPane instead of manually coding the interaction with the add/edit/delete buttons?
I haven't done a lot of Java programming, but I think using 2-3 different JPanel, and make visible the one you need depending on the button that was clicked would do the trick.
I'm not sure if this is the right approach though.
I was using a JFrame to add all buttons and make a new JFrame for a new window and hide a previous one.
gven way are better. I will do that now.

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