toolbarlayout.java

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// $Id: ToolBarLayout.java,v 1.1 2007/08/03 16:45:09 mike Exp $

package org.faceless.pdf2.viewer2;

import java.awt.*;
import javax.swing.JToolBar;

/**
 * Simple class to position toolbar elements so they wrap onto the next line
 */
class ToolBarLayout implements LayoutManager
{
    /**
     * Adds the specified component to the layout.  Sets the orientation to be horizontal.
     * @param name the name of the component
     * @param comp the component to be added
     */
    public void addLayoutComponent(String name, Component comp) {
        if (comp instanceof JToolBar) {
            ((JToolBar)comp).setOrientation(JToolBar.HORIZONTAL);
        }
    }

    public void removeLayoutComponent(Component comp) {
    }

    public Dimension preferredLayoutSize(Container c) {
        synchronized (c.getTreeLock()) {
            Dimension dim = new Dimension(0, 0);
            Insets insets = c.getInsets();
            int numrows	= 1;
            int rowwidth = insets.left + insets.right;
            int rowheight = 0;
            boolean first = true;
             
            for (int i=0;i<c.getComponentCount();i++) {
                Component m = c.getComponent(i);
                if (m.isVisible()) {
                    Dimension d = m.getPreferredSize();
                    if (d.height > rowheight) rowheight = d.height;
                    rowwidth += d.width;
                    if (rowwidth > c.getSize().width && !first) {
                        numrows++;
                        rowwidth = insets.left + insets.right + d.width;
                        first = true;
                    } else {
                        first = false;
                    }
                }
            }
            dim.width = c.getSize().width;
            dim.height = insets.top + insets.bottom + (numrows*rowheight);
            return dim;
        }
    }

    public Dimension minimumLayoutSize(Container c) {
        synchronized (c.getTreeLock()) {
            Dimension dim = new Dimension(0, 0);
            for (int i=0;i<c.getComponentCount();i++) {
                Component m = c.getComponent(i);
                if (m.isVisible()) {
                    Dimension d = m.getMinimumSize();
                    if (d.height > dim.height) dim.height = d.height;
                    dim.width += d.width;
                }
            }
            Insets insets = c.getInsets();
            dim.width += insets.left + insets.right;
            dim.height += insets.top + insets.bottom;
            return dim;
        }
    }

    private void setPositions(Container c, int start, int end, int x, int y, int h) {
        for (int i=start;i<end;i++) {
            Component m = c.getComponent(i);
            if (m.isVisible()) {
                m.setLocation(x, y + (h - m.getSize().height) / 2);
                x += m.getSize().width;
            }
        }
    }

    public void layoutContainer(Container c) {
        synchronized (c.getTreeLock()) {
            Insets insets = c.getInsets();
            int maxwidth = c.getSize().width - insets.left - insets.right;
            int rowh = 0, start = 0, x = 0, y = insets.top;
            for (int i=0;i<c.getComponentCount();i++) {
                Component m = c.getComponent(i);
                if (m.isVisible()) {
                    Dimension d = m.getPreferredSize();
                    m.setSize(d.width, d.height);
                    if (x == 0 || x+d.width <= maxwidth) {
                        x += d.width;
                        if (d.height > rowh) rowh = d.height;
                    } else {
                        setPositions(c, start, i, insets.left, y, rowh);
                        x = d.width;
                        y += rowh;
                        rowh = d.height;
                        start = i;
                    }
                }
            }
            setPositions(c, start, c.getComponentCount(), insets.left, y, rowh);
        }
    }
}