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Thread: How to get visible size of jpanel

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    Default How to get visible size of jpanel

    a.jpg
    So, i noticed a little misbehavior in java with all the sizes of jpanel. When i set bounds of jpanel, i.e., setbounds(0, 0, 100, 100), then the first point's (0,0) position is normal, but the second point is not point (100,100), because the size actually includes window decorations and/or shadows - a real mess, dont know what excatly is included, and the last visible point is something like (80,80) ... How can i get window decoration size, or how can i set visible size, not real size ?


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    Senior Member PhHein's Avatar
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    Default Re: How to get visible size of jpanel

    You have to make a difference between the window size and the panel size. setBounds is hardly needed as LayoutManagers take care of that stuff.
    What are you actually trying to do? Your approach smells like a misuse of the API.

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    Default Re: How to get visible size of jpanel

    I dont like layout managers and the way they work, so i dont use them, i do everything manually, it is much easier to place elements in the right place manualy, layout manager is like stupid AI in games Actually, this is not a big deal, i could just calculate myself java's miscalculations, but i just wondered if there is something in java, that determines size of window borders.

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    Default Re: How to get visible size of jpanel

    Quote Originally Posted by startas View Post
    How can i get window decoration size, or how can i set visible size, not real size ?
    Sounds like a bug introduced by the the code itself. Post the code in question where we can have a look

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    Default Re: How to get visible size of jpanel

    There are no miscalculations, there are wrong excpectations on your part. If you don't use LayoutManagers, you have to come up with these silly hacks. I wonder what your GUI looks like on different devices with different screen sizes and users resizing the top level component
    You have to get the panel's location in all parent containers and have to do the math yourself.

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    Default Re: How to get visible size of jpanel

    It will be just a program for myself, so no different pcs, especially devices, and screens. I'm just starting to build my programs gui, but initial code looks like this :
    import java.awt.Dimension;
    import javax.swing.ImageIcon;
    import javax.swing.JLabel;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
     
    public class MyProgram{
        private JFrame frame;
        private JPanel panel;
        private JLabel label;
        private int frameWidth = 1300;
        private int frameHeight = 700;
        private ImageIcon backgroundImage;
     
        public MyProgram() {
            initUI();
        }
     
     
        public void initUI() {
            frame = new JFrame("my program");
            backgroundImage = new ImageIcon("images/background.jpg"); 
            panel = new JPanel();
            label = new JLabel(backgroundImage);
     
            panel.setLayout(null);
            frame.setLayout(null);
            frame.add(label);
     
            frame.setBounds(10, 10, frameWidth, frameHeight);
            panel.setBounds(0, 0, frameWidth, frameHeight);
     
            panel.setSize(new Dimension(frameWidth, frameHeight));
            frame.setSize(new Dimension(frameWidth, frameHeight));
            label.setSize(new Dimension(frameWidth, frameHeight));
            label.setBounds(0, 0, frameWidth, frameHeight);
            frame.setResizable(false);
     
     
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        }
     
        public static void main(String[] args) {
            new MyProgram();
        }
    }

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    Default Re: How to get visible size of jpanel

    The panel is never added to the frame, fix that first...

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    Default Re: How to get visible size of jpanel

    Ok, my bad, update : it's not the point if it is jpanel or jlabel or jbutton or whatever, the point is, i can set frame's size i.e. to 1300x700, but i cant fit other elements into frame's work place 1:1, my element's (buttons, labels, other things...) starting point (0,0) gets good position, as you can see in picture above - it's point number 1, but i dont know how to get/set the last point in frame's work place (xxx,yyy) - point number 2 in picture above - without manual calculations / tweaks like frameWidth-15 or whatever i will get from experiments.

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    Default Re: How to get visible size of jpanel

    See post #5.
    Learn to use layout managers, it is not hard, and very helpful when used correctly.

    Do not force the size of the frame. Set the preferred size of the JPanel, add everything to the panel, add the panel to the frame, call frame.pack().
    The frame will size itself around the panel and give itself room for the decorations, the top left corner of the displayable area will be 0,0

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    Default Re: How to get visible size of jpanel

    If i have a simple JTabbedPane tabbedPane, and i add a few tabs to it with tabbedPane.addTab("name", JPanel panel), is it possible to add the same one element, i.e. JButton, to all of those panels-tabs ? Because i simply tried to do to all panels panelX.add(button), but button is visible only on the last panel i added it to, not on all panels.

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    Default Re: How to get visible size of jpanel

    s it possible to add the same one element, i.e. JButton, to all of those panels-tabs ?
    No it is not. A component can only be in one place at any given point in time. If added to a new/different container, it will remove itself from its previous container (as shown by your tests). I do not have the documentation handy at this point, but this rule is printed somewhere in there, and should be easy enough to discover with a search engine and enough keywords.

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    Default Re: How to get visible size of jpanel

    So the only variant to keep one element over every other element is to add that element directly to frame, i.e. JFrame frame.add(button, 0) ?

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    Default Re: How to get visible size of jpanel

    What do you mean by "over every other element"?
    ---What ever, the answer will still be 'No'
    JFrame is a Container and will function like all other Containers in terms of how things are treated when added, (Other factors do come in to play like LayoutManager)

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    Default Re: How to get visible size of jpanel

    Well, visually. I have a few panels-tabs, tabs has their own elements, and i need a way to add somewhere element, which will be visible over all other elements, so far the only way i found is to add element directly to jframe to position 0, frame.add(element, 0).

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    Default Re: How to get visible size of jpanel

    I do not understand the effect you are trying to achieve, perhaps a screenshot of what you want, or some code to show what you are attempting to accomplish?

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    Default Re: How to get visible size of jpanel

    I'm making a simple game, and part of the game is elements, that randomly appears/disappears at random positions, i realised these elements via jbutton, and i'm looking for the best way to keep these elements always on top over the rest of graphics. The part of appearing of element is realised via a simple frame.add(button, 0), and part of removing button is realised via frame.remove(button).
    There is nothing to not understand, open task manager and set "always on top", you will see what i'm trying to do.

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    Default Re: How to get visible size of jpanel

    You have an endearing personality, even in this medium.

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    Default Re: How to get visible size of jpanel

    "on top" and "over" could mean the y or z ordering depending on the context, and you were never specific.
    Look at the glass pane and the layered pane

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