src/demo/share/jfc/TransparentRuler/transparentruler/Ruler.java - platform/libcore - Gitiles

 /*
  * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *   - Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  *
  *   - Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  *   - Neither the name of Oracle nor the names of its
  *     contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 /*
  * This source code is provided to illustrate the usage of a given feature
  * or technique and has been deliberately simplified. Additional steps
  * required for a production-quality application, such as security checks,
  * input validation and proper error handling, might not be present in
  * this sample code.
  */

 package transparentruler;


 import java.awt.*;
 import java.awt.GraphicsDevice.WindowTranslucency;
 import static java.awt.GraphicsDevice.WindowTranslucency.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ComponentAdapter;
 import java.awt.event.ComponentEvent;
 import java.awt.event.KeyAdapter;
 import java.awt.event.KeyEvent;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.awt.geom.Path2D.Float;
 import java.lang.reflect.InvocationTargetException;
 import javax.swing.AbstractAction;
 import javax.swing.Action;
 import javax.swing.JFrame;
 import javax.swing.JMenuItem;
 import javax.swing.JPanel;
 import javax.swing.JPopupMenu;
 import javax.swing.SwingUtilities;
 import javax.swing.WindowConstants;


 /**
  * This sample demonstrates shaped and translucent window feature.
  * @author Alexander Kouznetsov
  */
 @SuppressWarnings("serial")
 public class Ruler extends JFrame {

     private static final Color BACKGROUND = Color.RED;
     private static final Color FOREGROUND = Color.WHITE;
     private static final int OPACITY = 180;
     private static final int W = 70;
     private static final int F_HEIGHT = 400;
     private static final int F_WIDTH = (int) (F_HEIGHT * 1.618 + 0.5);

     private static boolean translucencySupported;
     private static boolean transparencySupported;

     private static boolean checkTranslucencyMode(WindowTranslucency arg) {
         GraphicsEnvironment ge =
                 GraphicsEnvironment.getLocalGraphicsEnvironment();
         GraphicsDevice gd = ge.getDefaultScreenDevice();
         return gd.isWindowTranslucencySupported(arg);
     }

     public Shape buildShape() {
         int h = getHeight();
         int w = getWidth();
         float a = (float) Math.hypot(h, w);
         Float path = new java.awt.geom.Path2D.Float();
         path.moveTo(0, 0);
         path.lineTo(w, 0);
         path.lineTo(0, h);
         path.closePath();
         path.moveTo(W, W);
         path.lineTo(W, h - W * (a + h) / w);
         path.lineTo(w - W * (a + w) / h, W);
         path.closePath();
         return path;
     }

     private final ComponentAdapter componentListener = new ComponentAdapter() {

         /**
          * Applies the shape to window. It is recommended to apply shape in
          * componentResized() method
          */
         @Override
         public void componentResized(ComponentEvent e) {

             // We do apply shape only if PERPIXEL_TRANSPARENT is supported
             if (transparencySupported) {
                 setShape(buildShape());
             }
         }
     };

     private final Action exitAction = new AbstractAction("Exit") {

         {
             putValue(Action.MNEMONIC_KEY, KeyEvent.VK_X);
         }

         @Override
         public void actionPerformed(ActionEvent e) {
             System.exit(0);
         }
     };

     private final JPopupMenu jPopupMenu = new JPopupMenu();

     {
         jPopupMenu.add(new JMenuItem(exitAction));

         // To avoid popup cutting by main window shape forbid light-weight popups
         jPopupMenu.setLightWeightPopupEnabled(false);
     }

     /**
      * Implements mouse-related behavior: window dragging and popup menu
      * invocation
      */
     private final MouseAdapter mouseListener = new MouseAdapter() {

         int x, y;

         @Override
         public void mousePressed(MouseEvent e) {
             if (e.getButton() == MouseEvent.BUTTON1) {
                 x = e.getX();
                 y = e.getY();
             }
         }

         @Override
         public void mouseDragged(MouseEvent e) {
             if ((e.getModifiersEx() & MouseEvent.BUTTON1_DOWN_MASK) != 0) {
                 setLocation(e.getXOnScreen() - x, e.getYOnScreen() - y);
             }
         }

         @Override
         public void mouseReleased(MouseEvent e) {
             if (e.isPopupTrigger()) {
                 jPopupMenu.show(getContentPane(), e.getX(), e.getY());
             }
         }
     };

     /**
      * Implements keyboard navigation. Arrows move by 5 pixels, Ctrl + arrows
      * move by 50 pixels, Alt + arrows move by 1 pixel.
      * Esc exits the application.
      */
     private final KeyAdapter keyboardListener = new KeyAdapter() {

         @Override
         public void keyPressed(KeyEvent e) {
             int step = e.isControlDown() ? 50 : e.isAltDown() ? 1 : 5;
             switch (e.getKeyCode()) {
                 case KeyEvent.VK_LEFT:
                     setLocation(getX() - step, getY());
                     break;
                 case KeyEvent.VK_RIGHT:
                     setLocation(getX() + step, getY());
                     break;
                 case KeyEvent.VK_UP:
                     setLocation(getX(), getY() - step);
                     break;
                 case KeyEvent.VK_DOWN:
                     setLocation(getX(), getY() + step);
                     break;
                 case KeyEvent.VK_ESCAPE:
                     exitAction.actionPerformed(null);
             }
         }
     };

     public Ruler() {
         setUndecorated(true);

         // Enables perpixel translucency
         setBackground(new Color(BACKGROUND.getRed(), BACKGROUND.getGreen(),
                 BACKGROUND.getBlue(), OPACITY));

         addMouseListener(mouseListener);
         addMouseMotionListener(mouseListener);
         addComponentListener(componentListener);
         addKeyListener(keyboardListener);
         setContentPane(new JPanel() {

             @Override
             protected void paintComponent(Graphics g) {
                 Graphics2D gg = (Graphics2D) g.create();
                 int w = getWidth();
                 int h = getHeight();
                 int hh = gg.getFontMetrics().getAscent();

                 // This is an approach to apply shape when PERPIXEL_TRANSPARENT
                 // isn't supported
                 if (!transparencySupported) {
                     gg.setBackground(new Color(0, 0, 0, 0));
                     gg.clearRect(0, 0, w, h);
                     gg.clip(buildShape());

                     gg.setBackground(Ruler.this.getBackground());
                     gg.clearRect(0, 0, w, h);
                 }

                 gg.setColor(FOREGROUND);
                 for (int x = 0; x < w * (h - 8) / h - 5; x += 5) {
                     boolean hi = x % 50 == 0;
                     gg.drawLine(x + 5, 0, x + 5,
                             hi ? 20 : (x % 25 == 0 ? 13 : 8));
                     if (hi) {
                         String number = Integer.toString(x);
                         int ww = gg.getFontMetrics().stringWidth(number);
                         gg.drawString(number, x + 5 - ww / 2, 20 + hh);
                     }
                 }

                 gg.dispose();
             }
         });
         setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
         setSize(F_WIDTH, F_HEIGHT);
         setLocationByPlatform(true);
     }

     /**
      * @param args the command line arguments are ignored
      */
     public static void main(String[] args) throws InterruptedException, InvocationTargetException {

         SwingUtilities.invokeAndWait(new Runnable() {

             @Override
             public void run() {
                 translucencySupported = checkTranslucencyMode(PERPIXEL_TRANSLUCENT);
                 transparencySupported = checkTranslucencyMode(PERPIXEL_TRANSPARENT);

                 if (!translucencySupported) {
                     System.err.println("This application requires "
                             + "'PERPIXEL_TRANSLUCENT' translucency mode to "
                             + "be supported.");
                     System.exit(-1);
                 }

                 Ruler ruler = new Ruler();
                 ruler.setVisible(true);
             }
         });
     }
 }
	/*
	* Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* - Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* - Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* - Neither the name of Oracle nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
	* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	/*
	* This source code is provided to illustrate the usage of a given feature
	* or technique and has been deliberately simplified. Additional steps
	* required for a production-quality application, such as security checks,
	* input validation and proper error handling, might not be present in
	* this sample code.
	*/

	package transparentruler;


	import java.awt.*;
	import java.awt.GraphicsDevice.WindowTranslucency;
	import static java.awt.GraphicsDevice.WindowTranslucency.*;
	import java.awt.event.ActionEvent;
	import java.awt.event.ComponentAdapter;
	import java.awt.event.ComponentEvent;
	import java.awt.event.KeyAdapter;
	import java.awt.event.KeyEvent;
	import java.awt.event.MouseAdapter;
	import java.awt.event.MouseEvent;
	import java.awt.geom.Path2D.Float;
	import java.lang.reflect.InvocationTargetException;
	import javax.swing.AbstractAction;
	import javax.swing.Action;
	import javax.swing.JFrame;
	import javax.swing.JMenuItem;
	import javax.swing.JPanel;
	import javax.swing.JPopupMenu;
	import javax.swing.SwingUtilities;
	import javax.swing.WindowConstants;


	/**
	* This sample demonstrates shaped and translucent window feature.
	* @author Alexander Kouznetsov
	*/
	@SuppressWarnings("serial")
	public class Ruler extends JFrame {

	private static final Color BACKGROUND = Color.RED;
	private static final Color FOREGROUND = Color.WHITE;
	private static final int OPACITY = 180;
	private static final int W = 70;
	private static final int F_HEIGHT = 400;
	private static final int F_WIDTH = (int) (F_HEIGHT * 1.618 + 0.5);

	private static boolean translucencySupported;
	private static boolean transparencySupported;

	private static boolean checkTranslucencyMode(WindowTranslucency arg) {
	GraphicsEnvironment ge =
	GraphicsEnvironment.getLocalGraphicsEnvironment();
	GraphicsDevice gd = ge.getDefaultScreenDevice();
	return gd.isWindowTranslucencySupported(arg);
	}

	public Shape buildShape() {
	int h = getHeight();
	int w = getWidth();
	float a = (float) Math.hypot(h, w);
	Float path = new java.awt.geom.Path2D.Float();
	path.moveTo(0, 0);
	path.lineTo(w, 0);
	path.lineTo(0, h);
	path.closePath();
	path.moveTo(W, W);
	path.lineTo(W, h - W * (a + h) / w);
	path.lineTo(w - W * (a + w) / h, W);
	path.closePath();
	return path;
	}

	private final ComponentAdapter componentListener = new ComponentAdapter() {

	/**
	* Applies the shape to window. It is recommended to apply shape in
	* componentResized() method
	*/
	@Override
	public void componentResized(ComponentEvent e) {

	// We do apply shape only if PERPIXEL_TRANSPARENT is supported
	if (transparencySupported) {
	setShape(buildShape());
	}
	}
	};

	private final Action exitAction = new AbstractAction("Exit") {

	{
	putValue(Action.MNEMONIC_KEY, KeyEvent.VK_X);
	}

	@Override
	public void actionPerformed(ActionEvent e) {
	System.exit(0);
	}
	};

	private final JPopupMenu jPopupMenu = new JPopupMenu();

	{
	jPopupMenu.add(new JMenuItem(exitAction));

	// To avoid popup cutting by main window shape forbid light-weight popups
	jPopupMenu.setLightWeightPopupEnabled(false);
	}

	/**
	* Implements mouse-related behavior: window dragging and popup menu
	* invocation
	*/
	private final MouseAdapter mouseListener = new MouseAdapter() {

	int x, y;

	@Override
	public void mousePressed(MouseEvent e) {
	if (e.getButton() == MouseEvent.BUTTON1) {
	x = e.getX();
	y = e.getY();
	}
	}

	@Override
	public void mouseDragged(MouseEvent e) {
	if ((e.getModifiersEx() & MouseEvent.BUTTON1_DOWN_MASK) != 0) {
	setLocation(e.getXOnScreen() - x, e.getYOnScreen() - y);
	}
	}

	@Override
	public void mouseReleased(MouseEvent e) {
	if (e.isPopupTrigger()) {
	jPopupMenu.show(getContentPane(), e.getX(), e.getY());
	}
	}
	};

	/**
	* Implements keyboard navigation. Arrows move by 5 pixels, Ctrl + arrows
	* move by 50 pixels, Alt + arrows move by 1 pixel.
	* Esc exits the application.
	*/
	private final KeyAdapter keyboardListener = new KeyAdapter() {

	@Override
	public void keyPressed(KeyEvent e) {
	int step = e.isControlDown() ? 50 : e.isAltDown() ? 1 : 5;
	switch (e.getKeyCode()) {
	case KeyEvent.VK_LEFT:
	setLocation(getX() - step, getY());
	break;
	case KeyEvent.VK_RIGHT:
	setLocation(getX() + step, getY());
	break;
	case KeyEvent.VK_UP:
	setLocation(getX(), getY() - step);
	break;
	case KeyEvent.VK_DOWN:
	setLocation(getX(), getY() + step);
	break;
	case KeyEvent.VK_ESCAPE:
	exitAction.actionPerformed(null);
	}
	}
	};

	public Ruler() {
	setUndecorated(true);

	// Enables perpixel translucency
	setBackground(new Color(BACKGROUND.getRed(), BACKGROUND.getGreen(),
	BACKGROUND.getBlue(), OPACITY));

	addMouseListener(mouseListener);
	addMouseMotionListener(mouseListener);
	addComponentListener(componentListener);
	addKeyListener(keyboardListener);
	setContentPane(new JPanel() {

	@Override
	protected void paintComponent(Graphics g) {
	Graphics2D gg = (Graphics2D) g.create();
	int w = getWidth();
	int h = getHeight();
	int hh = gg.getFontMetrics().getAscent();

	// This is an approach to apply shape when PERPIXEL_TRANSPARENT
	// isn't supported
	if (!transparencySupported) {
	gg.setBackground(new Color(0, 0, 0, 0));
	gg.clearRect(0, 0, w, h);
	gg.clip(buildShape());

	gg.setBackground(Ruler.this.getBackground());
	gg.clearRect(0, 0, w, h);
	}

	gg.setColor(FOREGROUND);
	for (int x = 0; x < w * (h - 8) / h - 5; x += 5) {
	boolean hi = x % 50 == 0;
	gg.drawLine(x + 5, 0, x + 5,
	hi ? 20 : (x % 25 == 0 ? 13 : 8));
	if (hi) {
	String number = Integer.toString(x);
	int ww = gg.getFontMetrics().stringWidth(number);
	gg.drawString(number, x + 5 - ww / 2, 20 + hh);
	}
	}

	gg.dispose();
	}
	});
	setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
	setSize(F_WIDTH, F_HEIGHT);
	setLocationByPlatform(true);
	}

	/**
	* @param args the command line arguments are ignored
	*/
	public static void main(String[] args) throws InterruptedException, InvocationTargetException {

	SwingUtilities.invokeAndWait(new Runnable() {

	@Override
	public void run() {
	translucencySupported = checkTranslucencyMode(PERPIXEL_TRANSLUCENT);
	transparencySupported = checkTranslucencyMode(PERPIXEL_TRANSPARENT);

	if (!translucencySupported) {
	System.err.println("This application requires "
	+ "'PERPIXEL_TRANSLUCENT' translucency mode to "
	+ "be supported.");
	System.exit(-1);
	}

	Ruler ruler = new Ruler();
	ruler.setVisible(true);
	}
	});
	}
	}