Moving the JSplitPane Divider : JSplitPane « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. JSplitPane

Reset the divider position to that position by calling the resetToPreferredSizes() method of JSplitPane.

1. Change the dividerLocation property with setDividerLocation(newLocation).
2. 0.0 and 1.0, representing a percentage of the JSplitPane container width.

import java.awt.BorderLayout;

import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JSplitPane;

public class MovingJSplitPaneDivider {
  public static void main(String[] a) {
    JFrame horizontalFrame = new JFrame();
    horizontalFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JComponent topButton = new JButton("Left");
    JComponent bottomButton = new JButton("Right");
    final JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);

    splitPane.setTopComponent(topButton);
    splitPane.setBottomComponent(bottomButton);

    

    horizontalFrame.add(splitPane, BorderLayout.CENTER);
    horizontalFrame.setSize(150, 150);
    horizontalFrame.setVisible(true);

    splitPane.setDividerLocation(0.5);
  }
}

With the system-provided look and feel classes, pressing the F8 key allows you to move the divider with the keyboard keys such as Home, End, or the arrows. F8 isn't a modifier like Shift or Alt.

14.50.JSplitPane
	14.50.1.	JSplitPane
	14.50.2.	Moving the JSplitPane Divider
	14.50.3.	Setting Orientation: JSplitPane.VERTICAL_SPLIT or JSplitPane.HORIZONTAL_SPLIT
	14.50.4.	Create a left-right split pane
	14.50.5.	Create a top-bottom split pane
	14.50.6.	Resizing Components and Working with a One-Touch Expandable Divider
	14.50.7.	Nested JSplitPane
	14.50.8.	Listening for JSplitPane Property Changes
	14.50.9.	set Divider Location for JSplitPane
	14.50.10.	Continuously move the divider and resize its child components while the user is dragging the divider
	14.50.11.	The split pane supports a one-touch-expandable capability that allows the user to conveniently move the divider to either end with a single click
	14.50.12.	Distributing Space When a JSplitPane Container Is Resized
	14.50.13.	Getting the Setting the Children in a JSplitPane Container
	14.50.14.	Customizing a JSplitPane Look and Feel