JFrame with JscrollPane

Question

I'm trying to add few panel to JScrollpane and in turn to frame, but i'm not able to scroll. Here is the code.

first_panel =  new JPanel();
first_panel.setBackground(Color.red);
second_panel =  new JPanel();
second_panel.setBackground(Color.blue);
third_panel =  new JPanel();
third_panel.setBackground(Color.green);
fourth_panel =  new JPanel();
fourth_panel.setBackground(Color.red);
fifith_panel =  new JPanel();
fifith_panel.setBackground(Color.blue);
six_panel =  new JPanel();
six_panel.setBackground(Color.green);
final_panel =  new JPanel();
final_panel.setLayout(null);
final_panel.setBackground(Color.gray);
final_panel.add(first_panel);
final_panel.add(second_panel);
final_panel.add(third_panel);
final_panel.add(fourth_panel);
final_panel.add(fifith_panel);
final_panel.add(six_panel);

first_panel.setBounds(10,10,200,100);
second_panel.setBounds(10,10,200,200);
third_panel.setBounds(10,10,200,300);
fourth_panel.setBounds(10,10,200,400);
fifith_panel.setBounds(10,10,200,500);
six_panel.setBounds(10,10,200,600);
panel_scroll = new JScrollPane(final_panel);
panel_scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);    
final_panel.setBounds(0,0,400,400);
// scroll_panel =  new JPanel();
// scroll_panel.setLayout(null);
// scroll_panel.add(panel_scroll);
// panel_scroll.setBounds(0,0,400,400);
frame.getContentPane().add(panel_scroll);

Can someone helpme with this. Thanks in advance.

don't do any manual sizing/locating, instead use a suitable LayoutManager — kleopatra, Jul 08 '13 at 10:21
1) For better help sooner, post an [SSCCE](http://sscce.org/). 2) Please learn common [Java naming conventions](http://java.sun.com/docs/books/jls/second_edition/html/names.doc.html#73307) (specifically the case used for the names) for class, method & attribute names & use them consistently. 3) Java GUIs might have to work on a number of platforms, on different screen resolutions & using different PLAFs. They are not conducive to exact placement. To organize the components for a robust GUI, use layout managers, or combinations of them, along with layout padding & borders for white space. — Andrew Thompson, Jul 08 '13 at 10:58
Provide ASCII art of the GUI as it should appear in smallest size and (if resizable) with extra width/height. — Andrew Thompson, Jul 08 '13 at 10:59

score 3 · Answer 1 · answered Jul 08 '13 at 10:24

use standard LayoutManagers instead of AbsoluteLayout, then Swing GUI will be continuously or proportionally resize with JFrame
use GridLayout() for final_panel in the case that all JPanels can have got the same size on the screen
override getPreferredSize for JPanel, for inital and correct PreferredSize on the screen (greater dimension for final_panel than JScrollPane)
is required to override ScrollPanel.setPreferredScrollableViewportSize(new Dimension(int, int));, then to call JFrame.pack() for inital and correct PreferredSize on the screen
is required to override JScrollPane.getVerticalScrollBar().setUnitIncrement(int); for natural scrolling

JFrame with JscrollPane

1 Answers1