JLayeredPaneをJScrollPaneにはめ込む
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BGPanel.java
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import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.imageio.*;
import javax.swing.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.io.*;
import java.net.*;
/**
* $Id: L-S.html,v 1.1 2009/06/22 16:11:48 kishi Exp kishi $
* @author KISHI Yasuhiro
*/
public class BGPanel extends JPanel {
private BufferedImage image = null;
private Color bgColor = null;
public BGPanel() {
super();
bgColor = new Color( 0xcc, 0xcc, 0xff );
System.out.println( "画像URLを読み取り中・・・" );
image = null;
try {
image = ImageIO.read( new URL( "http://img.yahoo.co.jp/i/jp/my/top7.gif" ) );
} catch ( IOException ex ) {
ex.printStackTrace();
}
System.out.println( "完了しました！" );
}
public void paint( Graphics g ) {
int width = getWidth();
int height = getHeight();
g.setColor( bgColor );
// 背景色でこのコンポーネントを全て塗りつぶす
g.fillRect( 0 , 0 , width , height );
Graphics2D g2 = ( Graphics2D ) g;
g2.drawImage( image, width / 2, height / 2, this );
}
}
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LayeredPaneAndScrollPane.java
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import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.awt.geom.*;
import javax.swing.event.*;
import javax.swing.*;
import javax.swing.border.*;
/**
* $Id: L-S.html,v 1.1 2009/06/22 16:11:48 kishi Exp kishi $
* @author KISHI Yasuhiro
*/
public class LayeredPaneAndScrollPane extends JFrame {
public LayeredPaneAndScrollPane() {
super( "JLayeredPaneをJScrollPaneにはめ込むテスト" );
try {
// 外観を設定します
UIManager.setLookAndFeel( "com.sun.java.swing.plaf.windows.WindowsLookAndFeel" );
// 外観を変更します
SwingUtilities.updateComponentTreeUI( this );
} catch ( Exception e ) {
e.printStackTrace();
System.exit( -1 );
}
setBounds( 0, 0, 640, 480 );
// LayeredPaneをコンテナに配置
MyLayeredPane lPane = new MyLayeredPane( this.getWidth(), this.getHeight() );
JScrollPane sPane = new JScrollPane();
sPane.getViewport().setView( lPane );
sPane.setPreferredSize( new Dimension( 640, 480 ) );
Container container = getContentPane();
container.add( sPane );
setVisible( true );
addWindowListener( new WindowAdapter() {
public void windowClosing( WindowEvent ev ) {
dispose();
System.exit( 0 );
}
}
);
}
private static void createAndShowGUI() {
JFrame frame = new LayeredPaneAndScrollPane();
}
public static void main( String[] args ) {
javax.swing.SwingUtilities.invokeLater( new Runnable() {
public void run() {
createAndShowGUI();
}
}
);
}
}
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MyLayeredPane.java
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import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.awt.geom.*;
import javax.swing.event.*;
import javax.swing.*;
import javax.swing.border.*;
/**
* $Id: L-S.html,v 1.1 2009/06/22 16:11:48 kishi Exp kishi $
* @author KISHI Yasuhiro
*/
public class MyLayeredPane extends JLayeredPane {
public MyLayeredPane( int width, int height ) {
super();
System.out.println( "現在の使用しているレイアウトマネージャーは、" + getLayout() );
System.out.println( "preferredSize: " + getPreferredSize() );
//--- 重要 ---------------------------------------------------------------------------------------------
// レイアウトマネージャがnull、あるいは、PreferredSizeが未設定の場合、JScrollPaneがスクロールバーを表示できないので、
// PreferredSizeを適宜セットする
//------------------------------------------------------------------------------------------------------
setPreferredSize( new Dimension( width, height ) );
// 背景となるPanel
BGPanel bgPanel = new BGPanel();
bgPanel.setBounds( 0, 0, width, height );
this.add( bgPanel );
this.setLayer( bgPanel , -1 );
// 重ね合わせするPanel
OverlayedPanel olPanel = new OverlayedPanel();
olPanel.setBounds( 0, 0, width, height );
this.add( olPanel );
this.setLayer( olPanel , 0 );
}
}
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OverlayedPanel.java
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import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.*;
import java.awt.geom.*;
import javax.swing.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.imageio.*;
import java.awt.image.*;
import java.io.*;
/**
* $Id: L-S.html,v 1.1 2009/06/22 16:11:48 kishi Exp kishi $
* @author KISHI Yasuhiro
*/
public class OverlayedPanel extends JPanel implements ActionListener {
private BufferedImage offImage = null;
private Point currentPoint;
public OverlayedPanel() {
super();
setLayout( null );
// 透明にする
setOpaque( false );
JButton saveButton = new JButton( "画像を保存" );
saveButton.setLocation( 500, 350 );
saveButton.setSize( 100, 50 );
saveButton.setActionCommand( "SAVE" );
saveButton.addActionListener( this );
this.add( saveButton );
this.addMouseMotionListener( new MouseMotionAdapter() {
public void mouseDragged( MouseEvent e ) {
Point p = e.getPoint();
if ( offImage == null ) {
// ここは注意が必要 ⇒ BufferedImage.TYPE_INT_ARGB
// BufferedImage.TYPE_INT_RGBを使うと下のレイヤーの画像が塗り消されてしまいます
// アルファチャネルも追加しておく
offImage = new BufferedImage( getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB );
}
Graphics2D g2d = ( Graphics2D ) offImage.createGraphics();
g2d.setStroke( new BasicStroke( 3.0F ) );
g2d.setPaint( Color.black );
g2d.drawLine( currentPoint.x, currentPoint.y, p.x, p.y );
g2d.dispose();
repaint();
currentPoint = e.getPoint();
}
}
);
this.addMouseListener( new MouseAdapter() {
public void mousePressed( MouseEvent e ) {
currentPoint = e.getPoint();
}
}
);
}
public void paintComponent( Graphics g ) {
super.paintComponent( g );
if ( offImage != null ) {
( ( Graphics2D ) g ).drawImage( offImage, 0, 0, this );
}
}
public void actionPerformed( ActionEvent event ) {
String command = event.getActionCommand();
if ( "SAVE".equals( command ) ) {
System.out.println( "画像をファイルに保存しています..." );
try {
boolean result = ImageIO.write( offImage, "png", new File( "mytest.png" ) );
System.out.println( "画像をファイルに保存しました！" );
} catch ( Exception e ) {
e.printStackTrace();
}
}
}
}
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