gdt.jgui.tool.WrapLayout Maven / Gradle / Ivy
package gdt.jgui.tool;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Insets;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
/**
* FlowLayout subclass that fully supports wrapping of components.
*
* Contributed from http://tips4java.wordpress.com/2008/11/06/wrap-layout/
*
* @author Rob Camick
*/
public class WrapLayout extends FlowLayout {
private static final long serialVersionUID = 1L;
public WrapLayout() {
super();
}
public WrapLayout(int align) {
super(align);
}
public WrapLayout(int align, int hgap, int vgap) {
super(align, hgap, vgap);
}
@Override
public Dimension preferredLayoutSize(Container target) {
return layoutSize(target, true);
}
@Override
public Dimension minimumLayoutSize(Container target) {
Dimension minimum = layoutSize(target, false);
minimum.width -= (getHgap() + 1);
return minimum;
}
private Dimension layoutSize(Container target, boolean preferred) {
synchronized (target.getTreeLock()) {
int targetWidth = target.getSize().width;
if (targetWidth == 0)
targetWidth = Integer.MAX_VALUE;
int hgap = getHgap();
int vgap = getVgap();
Insets insets = target.getInsets();
int horizontalInsetsAndGap = insets.left + insets.right + (hgap * 2);
int maxWidth = targetWidth - horizontalInsetsAndGap;
Dimension dim = new Dimension(0, 0);
int rowWidth = 0;
int rowHeight = 0;
int nmembers = target.getComponentCount();
for (int i = 0; i < nmembers; i++) {
Component m = target.getComponent(i);
if (m.isVisible()) {
Dimension d = preferred ? m.getPreferredSize() : m.getMinimumSize();
if (rowWidth + d.width > maxWidth) {
addRow(dim, rowWidth, rowHeight);
rowWidth = 0;
rowHeight = 0;
}
if (rowWidth != 0) {
rowWidth += hgap;
}
rowWidth += d.width;
rowHeight = Math.max(rowHeight, d.height);
}
}
addRow(dim, rowWidth, rowHeight);
dim.width += horizontalInsetsAndGap;
dim.height += insets.top + insets.bottom + vgap * 2;
Container scrollPane = SwingUtilities.getAncestorOfClass(JScrollPane.class, target);
if (scrollPane != null) {
dim.width -= (hgap + 1);
}
return dim;
}
}
private void addRow(Dimension dim, int rowWidth, int rowHeight) {
dim.width = Math.max(dim.width, rowWidth);
if (dim.height > 0) {
dim.height += getVgap();
}
dim.height += rowHeight;
}
}