setgridsize.java

一个很好实用的工作流OSWORKFLOW开发例子.有着非常优秀的灵活性.

package com.opensymphony.workflow.designer.actions;

import java.awt.*;
import java.awt.event.ActionEvent;
import javax.swing.*;

import com.opensymphony.workflow.designer.WorkflowGraph;
import com.opensymphony.workflow.designer.ResourceManager;

public class SetGridSize extends JMenuItem
{
	SetGridSizeWidthHandler customHandler;

  class SetGridSizeWidthHandler extends AbstractAction
  {
	private WorkflowGraph graph;
	private Point location;
	private int iSize;

	SetGridSizeWidthHandler(WorkflowGraph graph, Point location, int gridSize, String name)
	{
	  super(name);
	  this.graph = graph;
	  this.location = location;
	  this.iSize = gridSize;
	}

	public void actionPerformed(ActionEvent e)
	{
	  graph.setGridVisible(iSize>1);
	  graph.setGridSize(iSize);
	}
  }

  public SetGridSize(WorkflowGraph graph, Point location, int gridSize)
  {
	super(gridSize>1 ? gridSize + " pt" : ResourceManager.getString("grid.disable"));
	setIcon(new GridIcon(gridSize));
	customHandler = new SetGridSizeWidthHandler(graph, location, gridSize, this.getName());
	addActionListener(customHandler);
  }

  class GridIcon implements Icon
  {
	private int gridSize;

	public GridIcon(int gridSize)
	{
	  this.gridSize = gridSize;
	}

	public void paintIcon(Component c, Graphics g, int x, int y)
	{
	  g.setColor(Color.WHITE);
	  g.fillRect(1, 1, getIconWidth(), getIconHeight() - 2);
	  int gridStep = 2;
	  g.setColor(new Color(220, 220, 220));
	  if (gridSize>1)
	  {
		  while (gridStep<getIconWidth())
		  {
		  	g.drawLine(gridStep, 1, gridStep, getIconHeight() - 2);
			g.drawLine(1, gridStep, getIconWidth(), gridStep);
			gridStep += gridSize;
		  }
	  }
	  g.setColor(Color.GRAY);
	  g.drawRect(1, 1, getIconWidth(), getIconHeight() - 2);
	}

	public int getIconWidth()
	{
	  return 20;
	}

	public int getIconHeight()
	{
	  return getHeight();
	}
  }

}