I'm trying to add multiple images to JLabel. The problem is that it is impossible to add more than one image, and I don't know how many images I will need in advance.
How can I overcome the problem? mabye not JLabel..
Thanks
1) Show us what you've done so far :)
2) Short answer is that you can't. JLabels and JButtons can only have one image associated. So you can either have multiple dynamically created JLabels or JPanels.
3) I don't understand why you want the image in a JLabel.
SOLUTION
Create a JPanel called container and give it a grid layout. Dynamically create more JPanels (pnl1, pnl2, etc) and add them to container. Each image should be added to pnl1, pnl2, etc.
Create a class image panel that extends jpanel as your container for each image.
If you don't know during compile time, I assume you know during runtime? Which means you just keep creating new panels until you run out of images.
In your Image Panel class you'll also want to assign an id for each image panel in the event that you want to be able to utilize or change the content/image later. So you'll find panels by id and not by variable name because those will all be dynamic and you won't have them.
Related
I have seen a program and was hoping to replicate one feature of it in my program. The program is a flashcard app, and when you create a new deck it adds another section to the homescreeen. I will attach images. I would love some advice on how to do this.
One of possible way is to use correct layouts, here is examples. Using this you may dynamically add any components (labels, images, buttons etc.) into your JPanel (I recommend to use JPanel as main container of all components instead of JFrame that should be one and just contain your JPanel).
I'm about to write a program using Java and i want it to have the next behavior:
Start with a small screen, just one button (i'm going for the JMenuBar) for the user to select a image file (a country or state map)
Once selected the image file, i'll need to resize the frame to the size of the selected image, and put the image as background.
when the user clicks somewhere inside the frame (click on a state or city) the program will have to create a visual object there, a circle, square or any form in that coordinates.
will need also a listener in those objects to know when they are clicked.
Summary: User has to select an image and trace a graph on it.
I am not asking for the code to do this. I would like to have some ideas about which components use to achieve this since i have been reading and there are plenty of ways to set the background image and stuff. But, considering the requirements, can you recommend me which components to use? I am a bit short of time since i've been given only about a week to code this, otherwise i would try all the alternatives by myself.
Some answer like:
"use a label to set the background and then resize the frame by this way: (some stuff) and then you can create a class extending from JLabel to create the circles with the listeners...." that would be enough help
I hope I was clear, any idea is welcome
Many thanks!
If you're going to stick with Swing I would use a JFileChooser to select the image. Once you got the image you can easily resize the JFrame by using the frame.setSize(image.getWidth(), image.getHeight());
To listen for mouse clicks inside your JFrame you need to use a MouseListener, make sure to add it to the frame, I always forget doing that.
Not sure whether you've succeeded drawing images/shapes at all. If not, you need to use a JPanel, check this topic if you need extra help.
If you are going to use a "JFrame " then you should definitely use Swing JFrames JPanels, and JLabels (as well as any other JComponents you need.) to accomplish this. Use only one JFrame. Use JPanel as the content pane/background for your JFrame and add everything else to it. But I would also suggest learning and using JavaFX because its the newest and I think it would be the easiest to use to do something like this. But if you only have a week and you know some swing use what you know. If you need more information post some code. Or ask a more direct question.
because I am displaying multiple images in my java programm, each image into a new jframe.
I need to identify the selected jframe in oder to make changes on the displayed image and show it in the same jframe.
So, How could I recognize the last selected jframe ?
I suggest you to use some other layout such as CardLayout to share same display space for multiple panel instead of using multiple JFrame.
See The Use of Multiple JFrames, Good/Bad Practice?
If you want to stick with current approach then create a global static reference of type JFrame to keep the reference of selected JFrame.
Use FocusListener to keep track of the selected JFarme
So, How could I recognize the last selected jframe ?
Keep the references of all opened JFrame and iterate all to check for JFrame#isFocused() or JFrame#isActive()
I am creating a JList dynamically and I want to use it on different JPanels where I can call a setQuery(query); on it. There is a Search Button + field connected to it too. Is there a way to place the JList, search button and search field on like 10 different panels without having to duplicate the code everywhere? I can't place it on a seperate JPanel as it has other buttons / gui elements that need be around it depending on what JPanel is being displayed. I've looked everywhere but there is not much mention of reusing a dynamic JList.
You can place a component in one visualized container only. Consider creating a method that creates these components for you, that returns a JPanel that holds the components, and perhaps have all created JLists share the same ListModel, and all JButtons the same AbstractAction.
Or another option, if you are using CardLayout to swap JPanels, and you want all of the panels to hold these components above, consider not doing this but moving the JList, JButton, and JTextField out of the cards and on to a less dynamic portion of your GUI.
Also, this is not clear to me:
I can't place it on a seperate JPanel as it has other buttons / gui elements that need be around it depending on what JPanel is being displayed.
Please clarify and tell us more. Images might help as well.
Also consider the decorator pattern Your list/search panel would be the main component, while the variations would result from decorating the original.
I'm trying to add an image to a JPanel in IntelliJ's GUI editor. I can't find anywhere that lets me do this.
Anyone have any idea?
if you want to add Image/ImageIcon to the GUI, then better way is put picture(s) to the JLabel, links to the tutorials contains examples for that, with for correct usage by LayoutManager and resiziable for/with Top-lavel Container
You haven't defined what "adding an image" means. Is this a background image and other components will be added on top. Do you want the image to fill the entire panel or should the image be painted at its actual size? The approach will be different depending on the answer. Maybe you can use an existing component or maybe you will need to create a custom component.
See Background Panel for a couple of approaches.