design/designer/src/com/fr/grid/GridCorner.java

/*
 * Copyright(c) 2001-2010, FineReport Inc, All Rights Reserved.
 */
package com.fr.grid;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;

import javax.swing.event.MouseInputListener;

import com.fr.base.GraphHelper;
import com.fr.design.mainframe.ElementCasePane;

/**
 * GridCorner used to paint and edit grid cornor.
 */
public class GridCorner extends BaseGridComponent {

    public GridCorner() {
        this.setOpaque(true);
        //james 清除所有的Key Action
        this.getInputMap().clear();
        this.getActionMap().clear();
        MouseInputListener l = new GridCornerMouseHandler(this);
        this.addMouseListener(l);
        this.addMouseMotionListener(l);
    }
    
    /**
     * Paints component
     */
    @Override
	public void paintComponent(Graphics g) {
        Graphics2D g2d = (Graphics2D) g;

        ElementCasePane reportPane = this.getElementCasePane();

        //size
        Dimension size = this.getSize();
        Rectangle2D rect2D = new Rectangle2D.Double(0, 0, size.getWidth(), size.getHeight());
        //paint background.
        if (this.getBackground() != null) {
            g2d.setPaint(this.getBackground());
            GraphHelper.fill(g2d, rect2D);
        } else {
            g2d.setPaint(reportPane.getBackground());
            GraphHelper.fill(g2d, rect2D);
        }
        
        paintArc(g2d, size);
           
        //画左边的边框线.
        g2d.setColor(reportPane.getGridColumn().getSeparatorLineColor());
        GraphHelper.drawLine(g2d, 0, 0, 0, size.getHeight());

        //画上边的边框线.
        g2d.setColor(reportPane.getGridRow().getSeparatorLineColor());
        GraphHelper.drawLine(g2d, 0, 0, size.getWidth(), 0);
    }

    /**
     * Gets the preferred size.
     */
    @Override
	public Dimension getPreferredSize() {
        ElementCasePane reportPane = this.getElementCasePane();

        if (!reportPane.isColumnHeaderVisible() || !reportPane.isRowHeaderVisible()) {
            return new Dimension(0, 0);
        }

        return new Dimension(reportPane.getGridRow().getPreferredSize().width,
            reportPane.getGridColumn().getPreferredSize().height);
    }

    /**
     * Gets corner background.
     */
    @Override
	public Color getBackground() {
        return super.getBackground();
    }

    
    private void paintArc(Graphics2D g2d, Dimension size) {
    	g2d.setColor(Color.gray);
    	int width = size.width - 16;
    	int avgWidth = width / 3;
    	int height = size.height - 8;
    	int avgHeight = height / 3;
    	for (int i = 0; i < 3; i ++) {
    		for (int j = 0; j < 3; j ++) {
    			 GraphHelper.fillArc(g2d, 8 + i * avgWidth, 4 + j * avgHeight, 3, 3, 0, 360);
    		}
    	}
    }
}