不规则窗体形状的ToolTip （二）

前一篇利用层实现ToolTip，利用图形组合实现不规则的ToolTip    是实现不规则窗体的ToolTip的方法，该方法虽然实现了要求，但却有两点不足：

第一：该方法太笨拙，每个需要ToolTip的组件都得重新去设置一次新的ToolTip类；

第二：在ToolTip超出窗体边缘时，没法显示超出部分。

   于是乎觉得这样处理是不正确的，定有其他方法来更好的实现。所以在网上找了下。找了N久，还是在google中找到了比较满意的解决方法。而且该方法能解决上面的两点不足。    

这里说下该方法的思想。

第一用到了

01.PopupFactory.setSharedInstance（PopupFactory popu）//方法  

这里为什么要用该方法呢？原来所有的Popup的获取都会从该PopupFactory中获取，所以在这里调用该方法设置用于获取 Popup 的 PopupFactory后系统的调用Popup就在我们的控制范围内了。

所以我们就必须得重新实现PopupFactory类来拦截对JToolTip的处理。

第二用到了实时截图并实时绘制截图，使得我们呈现出来的JToolTip窗体和其周围的内容没有出入。

先看效果：

下面贴出代码：

自己实现的PopupFactory类，这里主要拦截了JToolTip。

 

package com.michael.swingx.tooltip;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Robot;
import java.awt.Shape;
import java.awt.geom.Area;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;

import javax.swing.JComponent;
import javax.swing.JToolTip;
import javax.swing.Popup;
import javax.swing.PopupFactory;
import javax.swing.border.Border;

public class NonRectanglePopupFactory extends PopupFactory {
    private static final int BORDER_PAD = 20;
    private static Robot robot;
    static {
try {
    robot = new Robot();
} catch (Exception e) {
}
    }

    public NonRectanglePopupFactory() {
    }

    @Override
    public Popup getPopup(Component owner, Component contents, int x, int y)
    throws IllegalArgumentException {
if (contents instanceof JToolTip) {
    ((JToolTip) contents).setBorder(null);
    Dimension dim = contents.getPreferredSize();
    Rectangle bound = new Rectangle(x, y, dim.width + 2 * BORDER_PAD,
    dim.height + 2 * BORDER_PAD);
    /**
     * 这是关键创建包含从屏幕中读取的像素的图像。该图像不包括鼠标光标。 
     */
    BufferedImage backgroundImage = robot.createScreenCapture(bound);
    NonRectangleFrame frame = new NonRectangleFrame(owner, contents,
    backgroundImage);
    return super.getPopup(owner, frame, x, y);
} else
    return super.getPopup(owner, contents, x, y);
    }

    /**
     * 
     * @author mengke
     * @email [e-mail]
     * @version 1.0
     */
    class NonRectangleFrame extends JComponent {
public NonRectangleFrame(Component owner, Component content,
BufferedImage backgroundImage) {
    setLayout(new BorderLayout());
    add(content, BorderLayout.CENTER);
    setBorder(new NonRectangleBorder(owner, content, backgroundImage));
}
    }

    /**
     * @author mengke
     * @email [e-mail]
     * @version 1.0
     */
    class NonRectangleBorder implements Border {
private BufferedImage leftImage;
private BufferedImage rightImage;
private BufferedImage topImage;
private BufferedImage bottomImage;
private Component content;
private Color backColor = new Color(205, 235, 235);
private Color borderColor = new Color(95, 145, 145);

NonRectangleBorder(Component owner, Component content,
BufferedImage backgroundImage) {
    this.content = content;
    // backColor = this.content.getBackground();
    // borderColor  = backColor.darker();
    generateLeftImage(backgroundImage);
    generateTopImage(backgroundImage);
    generateRightImage(backgroundImage);
    generateBottomImage(backgroundImage);
}

@Override
public void paintBorder(Component c, Graphics g, int x, int y,
int width, int height) {
    //绘制图形，这些图形是当前位置的截图图形
    g.drawImage(leftImage, x, y, c);
    g.drawImage(rightImage, x + width - BORDER_PAD, y, c);
    g.drawImage(topImage, x + BORDER_PAD, y, c);
    g.drawImage(bottomImage, x + BORDER_PAD, y + height - BORDER_PAD, c);
    Rectangle bounds = new Rectangle(x, y, width, height);
    Graphics2D g2d = (Graphics2D) g;
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
    RenderingHints.VALUE_ANTIALIAS_ON);
    g2d.setColor(backColor); // 背景颜色
    content.setBackground(backColor);//使背景色与填充的多边形颜色一致
    g2d.fill(getArea(bounds.getSize()));
    g2d.setColor(borderColor);
    g2d.draw(getArea(bounds.getSize()));//画边框

    g.setColor(Color.black);
}

/**
 * 返回画图所需要的区域<br>
 * 这里主要用到了图形合并共能。通过图形合并我们可以实现各种自定义的图形
 * 
 * @param dim
 * @return
 */
private Area getArea(Dimension dim) {
    int roundX = BORDER_PAD - 2;
    int roundY = BORDER_PAD - 2;
    Shape r = new RoundRectangle2D.Float(roundX, roundY, dim.width
    - roundX * 2, dim.height - roundY * 2, 5, 5); // 圆角矩形
    Area area = new Area(r);
    Polygon polygon = new Polygon();// 多边形
    polygon.addPoint(22, roundY);
    polygon.addPoint(35, roundY);
    polygon.addPoint(22, 0);
    area.add(new Area(polygon)); // 合并图形
    return area;
}

@Override
public Insets getBorderInsets(Component c) {
    return new Insets(BORDER_PAD, BORDER_PAD, BORDER_PAD, BORDER_PAD);
}

@Override
public boolean isBorderOpaque() {
    return true;
}

private void generateLeftImage(BufferedImage backgroundImage) {
    leftImage = backgroundImage.getSubimage(0, 0, BORDER_PAD,
    backgroundImage.getHeight());
}

private void generateTopImage(BufferedImage backgroundImage) {
    topImage = backgroundImage.getSubimage(BORDER_PAD, 0,
    backgroundImage.getWidth() - 2 * BORDER_PAD, BORDER_PAD);
}

private void generateRightImage(BufferedImage backgroundImage) {
    rightImage = backgroundImage.getSubimage(backgroundImage.getWidth()
    - BORDER_PAD, 0, BORDER_PAD, backgroundImage.getHeight());
}

private void generateBottomImage(BufferedImage backgroundImage) {
    bottomImage = backgroundImage.getSubimage(BORDER_PAD,
    backgroundImage.getHeight() - BORDER_PAD,
    backgroundImage.getWidth() - 2 * BORDER_PAD, BORDER_PAD);
}
    }
}

测试类：

package com.michael.swingx.tooltip;

import java.awt.Dimension;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.PopupFactory;
import javax.swing.UIManager;

/**
 *@author michael
 *@email [e-mail]
 *@version 1.0
 */
public class TestToolTip extends JFrame{

    /***/
    private static final long serialVersionUID = 1L;

    public TestToolTip(){
JButton _btn = new JButton("ToolTip测试");
_btn.setToolTipText(_btn.getText());

JLabel _lb = new JLabel("<html>这是个Label,<br>这里测试ToolTip</html>");
_lb.setToolTipText(_lb.getText());
JPanel _plBody = new JPanel();
_plBody.add(_btn);
_plBody.add(_lb);
getContentPane().add(_plBody);
setLocationRelativeTo(null);
setSize(new Dimension(100,300));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
    }

    public static void main(String args[]) {
   try {
       /**
        *设置用于获取 Popup 的 PopupFactory。
        */
       PopupFactory.setSharedInstance(new NonRectanglePopupFactory());
       UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
   } catch (Exception ex) {
   }
   java.awt.EventQueue.invokeLater(new Runnable() {
       public void run() {
   new TestToolTip().setVisible(true);
       }
   });
       }

}