ConstrainedGrid.java

package se.cth.hedgehogphoto.geocoding.view;

/* Source code derivative work from:
 * http://stackoverflow.com/questions/7949363/java-layout-for-displaying-panels-dynamically-with-scroll-bar 
 */

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.util.List;

import javax.swing.JComponent;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.border.EmptyBorder;

import se.cth.hedgehogphoto.objects.LocationGPSObject;

/** This lays out components in a column that is constrained to the
 * top of an area, like the entries in a list or table.  It uses a GridLayout
 * for the main components, thus ensuring they are each of the same size.
 * For variable height components, a BoxLayout would be better. 
 * @author Florian Minges
 */
@SuppressWarnings("serial")
public class ConstrainedGrid extends JPanel {
	private JPanel componentPanel;
	private MouseAdapter mouseListener;

	public ConstrainedGrid() {
		this.setLayout(new BorderLayout(5,5));
		this.setBorder(new EmptyBorder(3,3,3,3));
		this.setBackground(Color.WHITE);

		this.componentPanel = new JPanel(new GridLayout(0,1,3,3));
		JScrollPane scrollPane = new JScrollPane(this.componentPanel);
		scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
		this.add(scrollPane, BorderLayout.CENTER);

		Dimension dimension = this.getPreferredSize();
		dimension = new Dimension(dimension.width, dimension.height+100);
		this.setPreferredSize(dimension);
	}

	public void addComponent(JComponent component) {
		this.componentPanel.add(component);
		this.validate();
	}

	public void addLocations(List<LocationGPSObject> locations) {
		if (locations == null) {
			return;
		}

		this.componentPanel.removeAll();
		GeoLocationPanel.resetColorScale();
		for (LocationGPSObject location : locations) {
			GeoLocationPanel panel = new GeoLocationPanel(location);
			if (this.mouseListener != null) 
				panel.addMouseListener(this.mouseListener);
			addComponent(panel);
		}
	}

	/**
	 * Doesn't work
	 * @return
	 */
	 public int getPreferredWidth() {
		return this.componentPanel.getPreferredSize().width;
	}

	 public void setMouseAdapter(MouseAdapter adapter) {
		 this.mouseListener = adapter;
	 }
}