问题
I have following source code...Can someone please give me an advice how to add jscrollpane onto jframe? I tried several time to add it to jframe but without any progress. It is not even showing.
public class Form3 {
JFrame jframe = new JFrame("Etiket print.");
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JPanel panel3 = new JPanel();
JPanel panel4 = new JPanel();
JScrollPane scrollFrame = new JScrollPane(panel2);
Color myBlue1Color = new Color(168, 175, 247);
Color myBlue2Color = new Color(139, 146, 255);
public Form3(){
jframe.setMinimumSize(new Dimension(1280, 1000));
panel2.setLayout(new BoxLayout(panel2, BoxLayout.Y_AXIS));
panel2.setAutoscrolls(true);
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//---------------------------------Header
panel1 = createSquareJPanel(Color.YELLOW, 600,200);
panel3 = createSquareJPanel(Color.GREEN, 400,200);
panel4 = createSquareJPanel(Color.white, 280,200);
JPanel container = new JPanel();
JPanel container1 = new JPanel();
JPanel container2 = new JPanel();
container.setLayout(new BoxLayout(container, BoxLayout.Y_AXIS));
container1.setLayout(new BoxLayout(container1, BoxLayout.Y_AXIS));
container2.setLayout(new BoxLayout(container2, BoxLayout.X_AXIS));
container1.add(panel1);
container2.add(container1);
container2.add(panel3);
container2.add(panel4);
container.add(container2);
container.add(panel2);
{
for (int i=0; i<25; i++){
JPanel harnessPanel= new JPanel();
harnessPanel.setMinimumSize(new Dimension(1280, 70));
harnessPanel.setMaximumSize(new Dimension(1280, 70));
harnessPanel.setPreferredSize(new Dimension(1280, 70));
if(i%2==0) {
harnessPanel.setBackground(myBlue1Color);
}
else {
harnessPanel.setBackground(myBlue2Color);
}
panel2.add(harnessPanel);
harnessPanel.repaint();
harnessPanel.validate();
}
panel2.repaint();
panel2.validate();
}
jframe.add(scrollFrame);
jframe.add(container);
jframe.pack();
jframe.setLocationRelativeTo(null);
jframe.setVisible(true);
}
private JPanel createSquareJPanel(Color color, int size1, int size2)
{
JPanel tempPanel = new JPanel();
tempPanel.setBackground(color);
tempPanel.setMinimumSize(new Dimension(size1, size2));
tempPanel.setMaximumSize(new Dimension(size1, size2));
tempPanel.setPreferredSize(new Dimension(size1, size2));
return tempPanel;
}
public static void main (String args[]){
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
Form3 myF=new Form3();
}
});
};
}
picture of my app:
actual state:
回答1:
JFrame
uses a BorderLayout
by default. It's default position (if you don't specify one) is CENTER
.
BorderLayout
will only allow one component to occupy any of it's 5 available positions.
So when you do...
jframe.add(scrollFrame);
jframe.add(container);
It adds the scrollFrame
to the center position and effectively removes it when you add container
(it doesn't actually remove it, but the result is just about the same).
Try supplying a position constraint. For example...
jframe.add(scrollFrame);
jframe.add(container, BorderLayout.SOUTH);
See How to use BorderLayout for more details
来源:https://stackoverflow.com/questions/18481241/how-to-add-jscrollpane-to-jframe