Can someone work out why my JScrollPane is not working. Perhaps something I may have missed. I realize this might be silly without any more context than what I've shown but please ask and I shall be happy to provide more.
public ApplicationFrame(String title, int x, int y, int width, int height) {
// Constructor for the ApplicationFrame, no implicit Construc.
setTitle(title);
setResizable(true);
setBounds(x, y, width, height);
setLayout(new BorderLayout());
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setIconImage(new ImageIcon(getClass().getResource("resources/topLeft.png")).getImage());
topMostMenuBar = new TopMenuBar(this);
setJMenuBar(topMostMenuBar.getMyJMenuBar());
paneEdge = BorderFactory.createLineBorder(Color.gray);
blackline = BorderFactory.createLineBorder(Color.black);
this.frameContent = new ApplicationPanel() {
//@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(TI, 0, 0, null);
}
};
mainImageScrollPane = new JScrollPane(frameContent);
statusPanel = new ApplicationPanel(new Color(0xfff0f0f0));
leftPanel = new ApplicationPanel(new Color(0xfff0f0f0));
testPanel = new ColorPanel(new Color(0xfff0f0f0));
testPanel.setPreferredSize(new Dimension(50,300));
add(mainImageScrollPane, BorderLayout.CENTER );
add(statusPanel, BorderLayout.SOUTH);
add(leftPanel, BorderLayout.WEST);
Container visibleArea = getContentPane();
visibleArea.add(frameContent);
setVisible(true);
do {
loadImageIn();
} while (!initLoadSuccess);
initButtons();
leftPanel.add(testPanel, BorderLayout.SOUTH);
} // end Constructor **
This is a big piece of code so I'm not sure how to make an SSCCE out of it. What youre looking at is the constructor to my subclass of a JFrame, which holds 3 panels. The ApplicationPanel is at this point just a JPanel. The loadImageIn() method opens a filechooser and then loads the chosen image which is painted onto frameContent. The image displays fine, everything works, except when I resize the window, there are no scrollbars.
You have this line, which adds the ApplicationPanel to the visibleArea...
visibleArea.add(frameContent);
Maybe you actually mean this, which adds the JScrollPane to the visibleArea (and the JScrollPane already contains the ApplicationPanel)...
visibleArea.add(mainImageScrollPane);
When you call new JScrollPane(frameContent), it doesn't do anything to the panel inside it, it just adds a wrapper around the outside. So, if you want the ability to scroll, you need to refer to the JScrollPane wrapper, rather than the panel itself.