labeledpairlayout.java

Owing to the applet Gantt chart source yard, already Chinese melt, Gantt chart can demonstrate a Chi

/**
 *   Copyright 2004 Carlos Silva A.
 * 
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License. 
 *   You may obtain a copy of the License at  
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 * 
 */
package jgantt.view;
import java.awt.*;
import java.util.*;
import javax.swing.*;

public class LabeledPairLayout implements LayoutManager
{
	public static String LABEL="label";
	public static String FIELD="field";
		
	Vector labels = new Vector();
	Vector fields = new Vector();

	int yGap = 2;
	int xGap = 2;

	public void addLayoutComponent(String s, Component c)
	{
		if (s.equals(LABEL))
		{
			labels.addElement(c);
		}
		else
		{
			fields.addElement(c);
		}
	}

	public void layoutContainer(Container c)
	{
		Insets insets = c.getInsets();

		int labelWidth = 0;
		Enumeration labelIter = labels.elements();
		while(labelIter.hasMoreElements())
		{
			JComponent comp = (JComponent)labelIter.nextElement();
			labelWidth = Math.max( labelWidth, comp.getPreferredSize().width );
		}

		int yPos = insets.top;

		Enumeration fieldIter = fields.elements();
		labelIter = labels.elements();
		while(labelIter.hasMoreElements() && fieldIter.hasMoreElements())
		{
			JComponent label = (JComponent)labelIter.nextElement();
			JComponent field = (JComponent)fieldIter.nextElement();
			int height = Math.max(label.getPreferredSize().height, field.getPreferredSize().height);
			label.setBounds( insets.left, yPos, labelWidth, height ); 
			field.setBounds( insets.left + labelWidth + xGap, 
				yPos, 
				c.getSize().width - (labelWidth +xGap + insets.left + insets.right), 
				height ); 
			yPos += (height + yGap);
		}

	}


	public Dimension minimumLayoutSize(Container c)
	{
		Insets insets = c.getInsets();

		int labelWidth = 0;
		Enumeration labelIter = labels.elements();
		while(labelIter.hasMoreElements())
		{
			JComponent comp = (JComponent)labelIter.nextElement();
			labelWidth = Math.max( labelWidth, comp.getPreferredSize().width );
		}

		int yPos = insets.top;

		labelIter = labels.elements();
		Enumeration fieldIter = fields.elements();
		while(labelIter.hasMoreElements() && fieldIter.hasMoreElements())
		{
			JComponent label = (JComponent)labelIter.nextElement();
			JComponent field = (JComponent)fieldIter.nextElement();
			int height = Math.max(label.getPreferredSize().height, field.getPreferredSize().height);
			yPos += (height + yGap);
		}
		return new Dimension( labelWidth * 3 , yPos );
	}

	public Dimension preferredLayoutSize(Container c)
	{
		Dimension d = minimumLayoutSize(c);
		//d.width *= 2;
		return d;
	}

	public void removeLayoutComponent(Component c)
	{
	}

}