编写自定义窗体和组件

            在学习java图形界面的时候，就想编写一个属于自己的窗体，可以自己定义组件的形状颜色等，今天终于实现了，和大家分享一下

首先编写自定义panel

import java.awt.BasicStroke; 
import java.awt.Color; 
import java.awt.Font; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.RenderingHints; 

import javax.swing.JFrame; 
import javax.swing.JPanel; 


public class MyPane extends JPanel { 

@Override 
protected void paintComponent(Graphics g) { 
Graphics2D g2d = (Graphics2D) g; 
// g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); 

g2d.setColor(new Color(255,255,255,140)); 
g2d.fillRoundRect(3, 3, getWidth()-7, getHeight()-7, 20, 20); 

g2d.setClip(0, 0, getWidth(), 30); 
g2d.setColor(Color.WHITE); 
g2d.fillRoundRect(1, 3, getWidth()-2, getHeight()-1, 20, 20); 
g2d.setClip(null); 

g2d.setColor(Color.darkGray); 
g2d.setStroke(new BasicStroke(6)); 
g2d.drawRoundRect(3, 3, getWidth()-7, getHeight()-7, 20, 20); 

g2d.setFont(new Font("Arial", Font.BOLD, 16)); 
g2d.setColor(Color.DARK_GRAY); 
g2d.drawString("Swing UI Test", 15, 24); 
} 
} 

 

自定义按钮UI

package jcomponent_v3;
import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Rectangle;

import javax.swing.AbstractButton;
import javax.swing.ButtonModel;
import javax.swing.JComponent;
import javax.swing.LookAndFeel;
import javax.swing.plaf.basic.BasicButtonUI;

public class MyButton extends BasicButtonUI  {
	@Override
	protected void installDefaults(AbstractButton b) {
		// TODO Auto-generated method stub
		super.installDefaults(b);
		LookAndFeel.installProperty(b, "opaque", Boolean.FALSE);
	}
	@Override
	public void paint(Graphics g, JComponent c) {
		g.setColor(new Color(255,0,0,150));
		g.fillRoundRect(0, 0, c.getWidth(), c.getHeight(), 50, 50);
		super.paint(g, c);
	}
	@Override
	protected void paintText(Graphics g, AbstractButton b, Rectangle textRect,
			String text) {
		// TODO Auto-generated method stub
		super.paintText(g, b, textRect, text);
	}

	@Override
	protected void paintFocus(Graphics g, AbstractButton b, Rectangle viewRect,
			Rectangle textRect, Rectangle iconRect) {
		// TODO Auto-generated method stub
		super.paintFocus(g, b, viewRect, textRect, iconRect);
	}

	@Override
	protected void paintButtonPressed(Graphics g, AbstractButton b) {
		g.setColor(new Color(255,200,0,150));
		g.fillRoundRect(0, 0, b.getWidth(), b.getHeight(), 50, 50);
	}
	
	@Override
	protected void paintIcon(Graphics g, JComponent c, Rectangle iconRect) {
		// TODO Auto-generated method stub
		super.paintIcon(g, c, iconRect);
	}

	@Override
	protected void paintText(Graphics g, JComponent c, Rectangle textRect,
			String text) {
		super.paintText(g, c, textRect, text);
	}
}

 自定义窗体

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Point;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.LayoutStyle.ComponentPlacement;


public class MyFrame extends JFrame {

	private MyPane contentPane;
	int mx,my,jfx,jfy;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					MyFrame frame = new MyFrame();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MyFrame() {
		setTitle("TestSwingAPI");
		addKeyListener(new KeyAdapter() {
			@Override
			public void keyTyped(KeyEvent e) {
				if (e.getKeyCode() == 0) {
					System.exit(0);
				}
			}
		});
		setUndecorated(true);
		setBackground(new Color(0,0,0,0));
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new MyPane();
		contentPane.addMouseMotionListener(new MouseMotionAdapter() {
			@Override
			public void mouseDragged(MouseEvent e) {
				setLocation(jfx+(e.getXOnScreen()-mx), jfy+(e.getYOnScreen()-my));
			}
		});
		contentPane.addMouseListener(new MouseAdapter() {
			@Override
			public void mousePressed(MouseEvent e) {
				mx = e.getXOnScreen();
				my = e.getYOnScreen();
				jfx = getX();
				jfy = getY();
			}
		});
		contentPane.setOpaque(false);
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		JPanel panel = new JPanel();
		panel.setOpaque(false);
		panel.setBounds(6, 31, 438, 263);
		contentPane.add(panel);
		
		JButton btnExit = new JButton("EXIT");
		btnExit.setUI(new MyButtonUI());
		
		JButton btnMax = new JButton("MAX");
		btnMax.setUI(new MyButtonUI());
		btnMax.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseClicked(MouseEvent e) {
				if (getExtendedState() == JFrame.MAXIMIZED_BOTH) {
					setExtendedState(JFrame.NORMAL);
				}else {
					setExtendedState(JFrame.MAXIMIZED_BOTH);
				}
			}
		});
		
		JButton btnMin = new JButton("MIN");
		btnMin.setUI(new MyButtonUI());
		btnMin.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseClicked(MouseEvent e) {
				setExtendedState(JFrame.ICONIFIED);
			}
		});
		GroupLayout gl_panel = new GroupLayout(panel);
		gl_panel.setHorizontalGroup(
			gl_panel.createParallelGroup(Alignment.TRAILING)
				.addGroup(gl_panel.createSequentialGroup()
					.addContainerGap(195, Short.MAX_VALUE)
					.addComponent(btnMin)
					.addPreferredGap(ComponentPlacement.RELATED)
					.addComponent(btnMax)
					.addPreferredGap(ComponentPlacement.RELATED)
					.addComponent(btnExit)
					.addContainerGap())
		);
		gl_panel.setVerticalGroup(
			gl_panel.createParallelGroup(Alignment.TRAILING)
				.addGroup(Alignment.LEADING, gl_panel.createSequentialGroup()
					.addContainerGap()
					.addGroup(gl_panel.createParallelGroup(Alignment.BASELINE)
						.addComponent(btnExit)
						.addComponent(btnMax)
						.addComponent(btnMin))
					.addContainerGap(228, Short.MAX_VALUE))
		);
		panel.setLayout(gl_panel);
		btnExit.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseClicked(MouseEvent e) {
				System.exit(0);
			}
		});
	}

}

 效果如图：