VerticalFlowLayout.java

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package org.nbgit.ui.diff;

import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.LayoutManager;

/**
 * Layes components in vertical axis one by one,
 * bottom by top.
 *
 * <p>Uses components preferred height
 * but forces them fixed width.
 *
 * @author Petr Kuzel
 */
public class VerticalFlowLayout implements LayoutManager {

    private final Component parent;

    /**
     * Creates a new instance of VerticalFlowLayout
     * @param parent <tt>parent.getWidth()</tt> defines the fixed width
     */
    public VerticalFlowLayout(Component parent) {
        this.parent = parent;
    }

    public void addLayoutComponent(String name, Component comp) {
    }

    public void removeLayoutComponent(Component comp) {
    }

    public Dimension preferredLayoutSize(Container target) {
        synchronized (target.getTreeLock()) {
            Dimension dim = new Dimension(0, 0);
            int nmembers = target.getComponentCount();

            for (int i = 0; i < nmembers; i++) {
                Component m = target.getComponent(i);
                if (m.isVisible()) {
                    Dimension d = m.getPreferredSize();
                    dim.width = Math.max(dim.width, d.width);
                    dim.height += d.height;
                }
            }
            Insets insets = target.getInsets();
            dim.width += insets.left + insets.right;
            dim.height += insets.top + insets.bottom;
            return dim;
        }
    }

    public Dimension minimumLayoutSize(Container target) {
        synchronized (target.getTreeLock()) {
            Dimension dim = new Dimension(0, 0);
            int nmembers = target.getComponentCount();

            for (int i = 0; i < nmembers; i++) {
                Component m = target.getComponent(i);
                if (m.isVisible()) {
                    Dimension d = m.getMinimumSize();
                    dim.width = Math.max(dim.width, d.width);
                    dim.height += d.height;
                }
            }
            Insets insets = target.getInsets();
            dim.width += insets.left + insets.right;
            dim.height += insets.top + insets.bottom;
            return dim;
        }
    }

    public void layoutContainer(Container target) {

        synchronized (target.getTreeLock()) {
            Insets insets = target.getInsets();
            int maxwidth = parent.getWidth() - (insets.left + insets.right);
            int nmembers = target.getComponentCount();
            int x = insets.left, y = insets.top;

            for (int i = 0; i < nmembers; i++) {
                Component m = target.getComponent(i);
                if (m.isVisible()) {
                    Dimension d = m.getPreferredSize();
                    m.setSize(maxwidth, d.height);
                    m.setLocation(x, y);
                    y += d.height;
                }
            }
        }
    }
}