Why Do Non-Resizable JFrames Overlap When Positioned Side-by-Side in Java Swing with Windows Aero Enabled?

Window Border Positioning and Non-Resizable Windows

In Java Swing applications, when creating non-resizable JFrames, the setLocation method may not properly account for the window border if Windows Aero is enabled. This leads to overlapping window borders when positioning windows side by side.

Consider the following code:

import java.awt.Rectangle;
import javax.swing.JFrame;

public class WindowBorders {
    public static void main(String[] args) {
        JFrame frame1 = new JFrame("frame 1");
        JFrame frame2 = new JFrame("frame 2");

        frame1.setResizable(false);
        frame2.setResizable(false);

        frame1.setVisible(true);
        Rectangle bounds = frame1.getBounds();
        frame2.setLocation(bounds.x + bounds.width, bounds.y);
        frame2.setVisible(true);
    }
}

When using Windows Aero, frame2 would be positioned with its border overlapping frame1's border. However, if Windows Aero is disabled or the frames are set to be resizable, the positioning works as expected.

To understand this issue, consider how non-resizable containers are handled by the operating system. When a window is non-resizable, the operating system determines the minimum size necessary for the window's content and the border. This minimum size is then enforced, and the window cannot be made any smaller.

In our code, the issue arises because when we set the location of frame2 using the setLocation method, we are specifying the position of the window's content, not the window's border. This means that the border of frame2 is not taken into account, resulting in the overlapping borders.

To work around this issue, we can adjust the position of frame2 to account for its border. One way to do this is by subtracting the border width from the desired X-coordinate:

frame2.setLocation(bounds.x + bounds.width - frame2.getInsets().right, bounds.y);

This ensures that frame2's border is properly taken into account and the two windows are positioned side by side without overlapping borders.

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