ctui.java

合并jtable中单元格的例子,简明扼要 很值得参考学习

package com.neuri.ctable;

import javax.swing.table.*;
import javax.swing.plaf.basic.*;
import java.awt.*;
import javax.swing.*;

public class CTUI extends BasicTableUI {
	public void paint(Graphics g, JComponent c) {
		Rectangle r = g.getClipBounds();
		int firstRow = table.rowAtPoint(new Point(0, r.y));
		int lastRow = table.rowAtPoint(new Point(0, r.y + r.height));
		// -1 is a flag that the ending point is outside the table
		if (lastRow < 0)
			lastRow = table.getRowCount() - 1;
		for (int i = firstRow; i <= lastRow; i++)
			paintRow(i, g);
	}

	private void paintRow(int row, Graphics g) {
		Rectangle r = g.getClipBounds();
		for (int i = 0; i < table.getColumnCount(); i++) {
			Rectangle r1 = table.getCellRect(row, i, true);
			if (r1.intersects(r)) // at least a part is visible
			{
				int sk = ((CTable) table).map.visibleCell(row, i);
				paintCell(row, sk, g, r1);
				// increment the column counter
				i += ((CTable) table).map.span(row, sk) - 1;
			}
		}
	}

	private void paintCell(int row, int column, Graphics g, Rectangle area) {
		int verticalMargin = table.getRowMargin();
		int horizontalMargin = table.getColumnModel().getColumnMargin();

		Color c = g.getColor();
		g.setColor(table.getGridColor());
		g.drawRect(area.x, area.y, area.width - 1, area.height - 1);
		g.setColor(c);

		area.setBounds(area.x + horizontalMargin / 2, area.y + verticalMargin
				/ 2, area.width - horizontalMargin, area.height
				- verticalMargin);

		if (table.isEditing() && table.getEditingRow() == row
				&& table.getEditingColumn() == column) {
			Component component = table.getEditorComponent();
			component.setBounds(area);
			component.validate();
		} else {
			TableCellRenderer renderer = table.getCellRenderer(row, column);
			Component component = table.prepareRenderer(renderer, row, column);
			if (component.getParent() == null)
				rendererPane.add(component);
			rendererPane.paintComponent(g, component, table, area.x, area.y,
					area.width, area.height, true);
		}
	}
}