flowlayout

/**
* A modified version of FlowLayout that allows containers using this
* Layout to behave in a reasonable manner when placed inside a
* JScrollPane

* @author Babu Kalakrishnan
*/


public class IntelligentFlowLayout extends FlowLayout
{
public IntelligentFlowLayout()
{
super();
}

public IntelligentFlowLayout(int align)
{
super(align);
}

public IntelligentFlowLayout(int align, int hgap, int vgap)
{
super(align, hgap, vgap);
}

public Dimension minimumLayoutSize(Container target)
{
return computeSize(target, false);
}

public Dimension preferredLayoutSize(Container target)
{
return computeSize(target, true);
}

private Dimension computeSize(Container target, boolean minimum)
{
synchronized (target.getTreeLock())
{
int hgap = getHgap();
int vgap = getVgap();
int w = target.getWidth();

// Let this behave like a regular FlowLayout (single row)
// if the container hasn't been assigned any size yet
if (w == 0)
w = Integer.MAX_VALUE;

Insets insets = target.getInsets();
if (insets == null)
insets = new Insets(0, 0, 0, 0);
int reqdWidth = 0;

int maxwidth = w - (insets.left insets.right hgap * 2);
int n = target.getComponentCount();
int x = 0;
int y = insets.top;
int rowHeight = 0;

for (int i = 0; i < n; i )
{
Component c = target.getComponent(i);
if (c.isVisible())
{
Dimension d =
minimum ? c.getMinimumSize() : c.getPreferredSize();
if ((x == 0) || ((x d.width) 0)
{
x = hgap;
}
x = d.width;
rowHeight = Math.max(rowHeight, d.height);
} else
{
x = d.width;
y = vgap rowHeight;
rowHeight = d.height;
}
reqdWidth = Math.max(reqdWidth, x);
}
}
y = rowHeight;
return new Dimension(reqdWidth insets.left insets.right, y);
}
}