Help on setting size of JFrame?

[A Watcher]

I'm trying to develop a slider control for an application. The slider
would be in a new Window. I can't seem to set the size of it. Here
is the code. Setting the location works, but not the size. In this
example SliderDemo2 is a class that extends JPanel. What am I doing
wrong? I've tried setting the size of the JPanel too, without
success.

public static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("SliderDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Wrapper.slider = new SliderDemo2();
frame.setLocation(600,300);
Dimension minSize = new Dimension(400,200);
frame.setMinimumSize(minSize);

//Add content to the window.
frame.add(Wrapper.slider, BorderLayout.WEST);

//Display the window.
frame.pack();
frame.setVisible(true);

}

 

[A Watcher]

I'm trying to develop a slider control for an application. The slider
would be in a new Window. I can't seem to set the size of it. Here
is the code. Setting the location works, but not the size. In this
example SliderDemo2 is a class that extends JPanel. What am I doing
wrong? I've tried setting the size of the JPanel too, without
success.

public static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("SliderDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Wrapper.slider = new SliderDemo2();
frame.setLocation(600,300);
Dimension minSize = new Dimension(400,200);
frame.setMinimumSize(minSize);

//Add content to the window.
frame.add(Wrapper.slider, BorderLayout.WEST);

//Display the window.
frame.pack();
frame.setVisible(true);

}

I also tried frame.setSize(600,300);

That didn't work either.

 

[thenerdwonder]

..pack() uses the preferredSize of each component to do its calculations

 

[A Watcher]

.pack() uses the preferredSize of each component to do its calculations

Thanks!

I knew it had to be something simple

 

[Mark Space]

Thanks!

I knew it had to be something simple

You can also use pack() first to size everything, then use setSize to
make certain stuff larger. setSize won't make things smaller, it just
makes them bigger (check the Java Doc, it says that right there in the
description). That's a simple way of setting the size of objects.

You can also make a new slider of your own like so:

public class MySlider extends javax.swing.JSlider {

}

and override the getPreferredSize() method. Or you could use a Layout
Manager that was a bit more sophisticated and didn't just smash
everything down to the preferred size. Either of these latter two
options is probably a better long term solution.

 

[thenerdwonder]

You can also use pack() first to size everything, then use setSize to
make certain stuff larger. setSize won't make things smaller, it just
makes them bigger (check the Java Doc, it says that right there in the
description). That's a simple way of setting the size of objects.

It's also fragile. If the layout manager decides to recalculate
everything, you go back to the default preferredSize

You can also make a new slider of your own like so:

public class MySlider extends javax.swing.JSlider {

}

and override the getPreferredSize() method.

Which is better than just calling setPreferredSize() how? Creating a
subclass just to resize a component is silly at best.

Or you could use a Layout Manager that was a bit more sophisticated
> and didn't just smash everything down to the preferred size. Either
> of these latter two options is probably a better long term solution.

Sure, or you could learn how Swing works and use it properly.