如何在 Java 中创建大尺寸自定义光标？
How To create A Large Size Custom Cursor In Java?
我正在为屡获殊荣的密码保护系统开发 Java Swing 应用程序，我需要一个大的自定义光标 [80 x 80]，您可能会问为什么这么大，网上有一个您可以查看演示以了解为什么它需要这么大：http://gatecybertech.net
上面link中的登录页面使用了那个大光标。当然，您需要先创建一个测试密码，然后才能尝试登录。
但无论如何，在我的 Swing 应用程序中，我将最大可能的自定义光标限制为 32 x 32，我的代码如下所示：
Image cursorImage = toolkit.getImage("Cursor_Crosshair.PNG");
Tabular_Panel.setCursor(Toolkit.getDefaultToolkit().createCustomCursor(cursorImage,new Point(0,0),"custom cursor"));
Cursor_Crosshair.PNG 的图像大小为：80 x 80
但屏幕上显示的是它的缩小版：32 x 32
所以我的问题是：如何绕过客户光标图像的大小限制，并使光标以 80 x 80 的大小显示？
我知道 OS 可能是限制的原因，有没有办法克服它？
好的，经过一番研究和修改，我找到了答案：
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import javax.swing.event.MouseInputAdapter;
public class Demo_Large_Custom_Cursor
{
static private MyGlassPane myGlassPane;
// Create the GUI and show it. For thread safety, this method should be invoked from the event-dispatching thread.
private static void createAndShowGUI()
{
//Create and set up the window.
JFrame frame=new JFrame("Demo_Large_Custom_Cursor");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Start creating and adding components.
JCheckBox changeButton=new JCheckBox("Custom Cursor \"visible\"");
changeButton.setSelected(false);
//Set up the content pane, where the "main GUI" lives.
Container contentPane=frame.getContentPane();
contentPane.setLayout(new FlowLayout());
contentPane.add(changeButton);
JButton Button_1=new JButton("<Html><Table Cellpadding=7><Tr><Td>A</Td><Td>B</Td></Tr><Tr><Td>C</Td><Td>D</Td></Tr></Table></Html>");
Button_1.setPreferredSize(new Dimension(80,80));
Button_1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { Out("Button 1"); } });
contentPane.add(Button_1);
JButton Button_2=new JButton("<Html><Table Cellpadding=7><Tr><Td>1</Td><Td>2</Td></Tr><Tr><Td>3</Td><Td>4</Td></Tr></Table></Html>");
Button_2.setPreferredSize(new Dimension(80,80));
Button_2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { Out("Button 2"); } });
contentPane.add(Button_2);
//Set up the menu bar, which appears above the content pane.
JMenuBar menuBar=new JMenuBar();
JMenu menu=new JMenu("Menu");
menu.add(new JMenuItem("Do nothing"));
menuBar.add(menu);
frame.setJMenuBar(menuBar);
//Set up the glass pane, which appears over both menu bar
//and content pane and is an item listener on the change
//button.
myGlassPane=new MyGlassPane(changeButton,menuBar,frame.getContentPane());
changeButton.addItemListener(myGlassPane);
frame.setGlassPane(myGlassPane);
//Show the window.
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}
private static void out(String message) { System.out.print(message); }
private static void Out(String message) { System.out.println(message); }
public static void main(String[] args)
{
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
}
/**
We have to provide our own glass pane so that it can paint.
*/
class MyGlassPane extends JComponent implements ItemListener
{
Point point;
//React to change button clicks.
public void itemStateChanged(ItemEvent e)
{
setVisible(e.getStateChange()==ItemEvent.SELECTED);
}
protected void paintComponent(Graphics g)
{
try
{
if (point!=null)
{
// g.setColor(Color.red);
// g.fillOval(point.x-10,point.y-10,20,20);
BufferedImage image=ImageIO.read(new File("C:/Cursor_Crosshair.PNG"));
g.drawImage(image,point.x-39,point.y-39,null);
}
}
catch (Exception e) { }
}
public void setPoint(Point p)
{
point=p;
}
public MyGlassPane(AbstractButton aButton,JMenuBar menuBar,Container contentPane)
{
CBListener listener=new CBListener(aButton,menuBar,this,contentPane);
addMouseListener(listener);
addMouseMotionListener(listener);
}
}
/**
Listen for all events that our check box is likely to be interested in. Redispatch them to the check box.
*/
class CBListener extends MouseInputAdapter
{
Toolkit toolkit;
Component liveButton;
JMenuBar menuBar;
MyGlassPane glassPane;
Container contentPane;
public CBListener(Component liveButton,JMenuBar menuBar,MyGlassPane glassPane,Container contentPane)
{
toolkit=Toolkit.getDefaultToolkit();
this.liveButton=liveButton;
this.menuBar=menuBar;
this.glassPane=glassPane;
this.contentPane=contentPane;
}
public void mouseMoved(MouseEvent e)
{
// redispatchMouseEvent(e,false);
redispatchMouseEvent(e,true);
}
public void mouseDragged(MouseEvent e)
{
redispatchMouseEvent(e,false);
}
public void mouseClicked(MouseEvent e)
{
redispatchMouseEvent(e,false);
}
public void mouseEntered(MouseEvent e)
{
redispatchMouseEvent(e,false);
}
public void mouseExited(MouseEvent e)
{
redispatchMouseEvent(e,false);
}
public void mousePressed(MouseEvent e)
{
redispatchMouseEvent(e,false);
}
public void mouseReleased(MouseEvent e)
{
redispatchMouseEvent(e,true);
}
//A basic implementation of redispatching events.
private void redispatchMouseEvent(MouseEvent e,boolean repaint)
{
Point glassPanePoint=e.getPoint();
Container container=contentPane;
Point containerPoint=SwingUtilities.convertPoint(glassPane,glassPanePoint,contentPane);
if (containerPoint.y<0)
{ //we're not in the content pane
if (containerPoint.y+menuBar.getHeight()>=0)
{
//The mouse event is over the menu bar.
//Could handle specially.
}
else
{
//The mouse event is over non-system window
//decorations, such as the ones provided by
//the Java look and feel.
//Could handle specially.
}
}
else
{
//The mouse event is probably over the content pane.
//Find out exactly which component it's over.
Component component=SwingUtilities.getDeepestComponentAt(container,containerPoint.x,containerPoint.y);
// if ((component!=null) && (component.equals(liveButton)))
if ((component!=null))
{
//Forward events over the check box.
Point componentPoint=SwingUtilities.convertPoint(glassPane,glassPanePoint,component);
component.dispatchEvent(new MouseEvent(component,e.getID(),e.getWhen(),e.getModifiers(),componentPoint.x,componentPoint.y,e.getClickCount(),e.isPopupTrigger()));
}
}
//Update the glass pane if requested.
if (repaint)
{
glassPane.setPoint(glassPanePoint);
glassPane.repaint();
}
}
}
而 Cursor_Crosshair.PNG 是这样的：
这是我对玻璃板绘画方法的看法。这被设置为表现得非常像设置自定义光标。默认 "arrow" 光标在显示自定义光标时隐藏，当组件具有其他光标集（例如文本框）时自定义光标隐藏。
不幸的是，它最终似乎需要相当多的 Swing 黑魔法，所以我不太喜欢它，但它似乎工作正常。我以前做过这样的游标，但它是为了更简单的东西，所以我没有 运行 涉及这些问题。
我 运行 遇到的一些问题是：
玻璃窗格拦截光标更改（例如在 SO here). The only solution I've been able to find is to override Component.contains(int,int) to return false (described here, shown here 上描述），但为什么它有效并且似乎没有破坏其他任何东西是神秘的。
鼠标退出事件有时 return 组件边界内的一个位置，所以我认为没有可靠的方法知道鼠标何时离开 window除了使用计时器。
package mcve;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.net.*;
import java.io.*;
public class LargeCursor {
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame frame = new JFrame();
JPanel glass = new CustomGlassPane();
glass.add(new CursorPanel(), BorderLayout.CENTER);
frame.setGlassPane(glass);
// This next call is necessary because JFrame.setGlassPane delegates to the root pane:
// - https://docs.oracle.com/javase/9/docs/api/javax/swing/RootPaneContainer.html#setGlassPane-java.awt.Component-
// - http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/javax/swing/JFrame.java#l738
// And JRootPane.setGlassPane may call setVisible(false):
// - https://docs.oracle.com/javase/9/docs/api/javax/swing/JRootPane.html#setGlassPane-java.awt.Component-
// - http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/javax/swing/JRootPane.java#l663
glass.setVisible(true);
JPanel content = createTestPanel();
content.setCursor(BlankCursor.INSTANCE);
frame.setContentPane(content);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
static class CustomGlassPane extends JPanel {
CustomGlassPane() {
super(new BorderLayout());
super.setOpaque(false);
}
@Override
public boolean contains(int x, int y) {
return false;
}
}
static class CursorPanel extends JPanel {
final BufferedImage cursorImage;
Point mouseLocation;
CursorPanel() {
try {
cursorImage = createTransparentImage(
ImageIO.read(new URL("https://i.stack.imgur.com/9h2oI.png")));
} catch (IOException x) {
throw new UncheckedIOException(x);
}
setOpaque(false);
long mask = AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK;
Toolkit.getDefaultToolkit().addAWTEventListener((AWTEvent e) -> {
switch (e.getID()) {
case MouseEvent.MOUSE_ENTERED:
case MouseEvent.MOUSE_EXITED:
case MouseEvent.MOUSE_MOVED:
case MouseEvent.MOUSE_DRAGGED:
capturePoint((MouseEvent) e);
break;
}
}, mask);
// This turned out to be necessary, because
// the 'mouse exit' events don't always have
// a Point location which is outside the pane.
Timer timer = new Timer(100, (ActionEvent e) -> {
if (mouseLocation != null) {
Point p = MouseInfo.getPointerInfo().getLocation();
SwingUtilities.convertPointFromScreen(p, this);
if (!contains(p)) {
setMouseLocation(null);
}
}
});
timer.setRepeats(true);
timer.start();
}
void capturePoint(MouseEvent e) {
Component comp = e.getComponent();
Point onThis = SwingUtilities.convertPoint(comp, e.getPoint(), this);
boolean drawCursor = contains(onThis);
if (drawCursor) {
Window window = SwingUtilities.windowForComponent(this);
if (window instanceof JFrame) {
Container content = ((JFrame) window).getContentPane();
Point onContent = SwingUtilities.convertPoint(comp, e.getPoint(), content);
Component deepest = SwingUtilities.getDeepestComponentAt(content, onContent.x, onContent.y);
if (deepest != null) {
if (deepest.getCursor() != BlankCursor.INSTANCE) {
drawCursor = false;
}
}
}
}
setMouseLocation(drawCursor ? onThis : null);
}
void setMouseLocation(Point mouseLocation) {
this.mouseLocation = mouseLocation;
repaint();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (mouseLocation != null) {
int x = mouseLocation.x - (cursorImage.getWidth() / 2);
int y = mouseLocation.y - (cursorImage.getHeight() / 2);
g.drawImage(cursorImage, x, y, this);
}
}
}
static final class BlankCursor {
static final Cursor INSTANCE =
Toolkit.getDefaultToolkit().createCustomCursor(
new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB),
new Point(),
"BLANK");
}
static JPanel createTestPanel() {
JPanel panel = new JPanel(new GridLayout(3, 3));
panel.setBorder(BorderFactory.createEmptyBorder(100, 100, 100, 100));
for (int i = 0; i < 9; ++i) {
if ((i % 2) == 0) {
JTextField field = new JTextField("Text Field");
field.setHorizontalAlignment(JTextField.CENTER);
panel.add(field);
} else {
panel.add(new JButton("Button"));
}
}
return panel;
}
static BufferedImage createTransparentImage(BufferedImage img) {
BufferedImage copy =
GraphicsEnvironment.getLocalGraphicsEnvironment()
.getDefaultScreenDevice()
.getDefaultConfiguration()
.createCompatibleImage(img.getWidth(),
img.getHeight(),
Transparency.TRANSLUCENT);
for (int x = 0; x < img.getWidth(); ++x) {
for (int y = 0; y < img.getHeight(); ++y) {
int rgb = img.getRGB(x, y) & 0x00FFFFFF;
int bright = (((rgb >> 16) & 0xFF) + ((rgb >> 8) & 0xFF) + (rgb & 0xFF)) / 3;
int alpha = 255 - bright;
copy.setRGB(x, y, (alpha << 24) | rgb);
}
}
return copy;
}
}
我正在为屡获殊荣的密码保护系统开发 Java Swing 应用程序，我需要一个大的自定义光标 [80 x 80]，您可能会问为什么这么大，网上有一个您可以查看演示以了解为什么它需要这么大：http://gatecybertech.net
上面link中的登录页面使用了那个大光标。当然，您需要先创建一个测试密码，然后才能尝试登录。
但无论如何，在我的 Swing 应用程序中，我将最大可能的自定义光标限制为 32 x 32，我的代码如下所示：
Image cursorImage = toolkit.getImage("Cursor_Crosshair.PNG");
Tabular_Panel.setCursor(Toolkit.getDefaultToolkit().createCustomCursor(cursorImage,new Point(0,0),"custom cursor"));
Cursor_Crosshair.PNG 的图像大小为：80 x 80
但屏幕上显示的是它的缩小版：32 x 32
所以我的问题是：如何绕过客户光标图像的大小限制，并使光标以 80 x 80 的大小显示？
我知道 OS 可能是限制的原因，有没有办法克服它？
好的，经过一番研究和修改，我找到了答案：
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import javax.swing.event.MouseInputAdapter;
public class Demo_Large_Custom_Cursor
{
static private MyGlassPane myGlassPane;
// Create the GUI and show it. For thread safety, this method should be invoked from the event-dispatching thread.
private static void createAndShowGUI()
{
//Create and set up the window.
JFrame frame=new JFrame("Demo_Large_Custom_Cursor");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Start creating and adding components.
JCheckBox changeButton=new JCheckBox("Custom Cursor \"visible\"");
changeButton.setSelected(false);
//Set up the content pane, where the "main GUI" lives.
Container contentPane=frame.getContentPane();
contentPane.setLayout(new FlowLayout());
contentPane.add(changeButton);
JButton Button_1=new JButton("<Html><Table Cellpadding=7><Tr><Td>A</Td><Td>B</Td></Tr><Tr><Td>C</Td><Td>D</Td></Tr></Table></Html>");
Button_1.setPreferredSize(new Dimension(80,80));
Button_1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { Out("Button 1"); } });
contentPane.add(Button_1);
JButton Button_2=new JButton("<Html><Table Cellpadding=7><Tr><Td>1</Td><Td>2</Td></Tr><Tr><Td>3</Td><Td>4</Td></Tr></Table></Html>");
Button_2.setPreferredSize(new Dimension(80,80));
Button_2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { Out("Button 2"); } });
contentPane.add(Button_2);
//Set up the menu bar, which appears above the content pane.
JMenuBar menuBar=new JMenuBar();
JMenu menu=new JMenu("Menu");
menu.add(new JMenuItem("Do nothing"));
menuBar.add(menu);
frame.setJMenuBar(menuBar);
//Set up the glass pane, which appears over both menu bar
//and content pane and is an item listener on the change
//button.
myGlassPane=new MyGlassPane(changeButton,menuBar,frame.getContentPane());
changeButton.addItemListener(myGlassPane);
frame.setGlassPane(myGlassPane);
//Show the window.
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}
private static void out(String message) { System.out.print(message); }
private static void Out(String message) { System.out.println(message); }
public static void main(String[] args)
{
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
}
/**
We have to provide our own glass pane so that it can paint.
*/
class MyGlassPane extends JComponent implements ItemListener
{
Point point;
//React to change button clicks.
public void itemStateChanged(ItemEvent e)
{
setVisible(e.getStateChange()==ItemEvent.SELECTED);
}
protected void paintComponent(Graphics g)
{
try
{
if (point!=null)
{
// g.setColor(Color.red);
// g.fillOval(point.x-10,point.y-10,20,20);
BufferedImage image=ImageIO.read(new File("C:/Cursor_Crosshair.PNG"));
g.drawImage(image,point.x-39,point.y-39,null);
}
}
catch (Exception e) { }
}
public void setPoint(Point p)
{
point=p;
}
public MyGlassPane(AbstractButton aButton,JMenuBar menuBar,Container contentPane)
{
CBListener listener=new CBListener(aButton,menuBar,this,contentPane);
addMouseListener(listener);
addMouseMotionListener(listener);
}
}
/**
Listen for all events that our check box is likely to be interested in. Redispatch them to the check box.
*/
class CBListener extends MouseInputAdapter
{
Toolkit toolkit;
Component liveButton;
JMenuBar menuBar;
MyGlassPane glassPane;
Container contentPane;
public CBListener(Component liveButton,JMenuBar menuBar,MyGlassPane glassPane,Container contentPane)
{
toolkit=Toolkit.getDefaultToolkit();
this.liveButton=liveButton;
this.menuBar=menuBar;
this.glassPane=glassPane;
this.contentPane=contentPane;
}
public void mouseMoved(MouseEvent e)
{
// redispatchMouseEvent(e,false);
redispatchMouseEvent(e,true);
}
public void mouseDragged(MouseEvent e)
{
redispatchMouseEvent(e,false);
}
public void mouseClicked(MouseEvent e)
{
redispatchMouseEvent(e,false);
}
public void mouseEntered(MouseEvent e)
{
redispatchMouseEvent(e,false);
}
public void mouseExited(MouseEvent e)
{
redispatchMouseEvent(e,false);
}
public void mousePressed(MouseEvent e)
{
redispatchMouseEvent(e,false);
}
public void mouseReleased(MouseEvent e)
{
redispatchMouseEvent(e,true);
}
//A basic implementation of redispatching events.
private void redispatchMouseEvent(MouseEvent e,boolean repaint)
{
Point glassPanePoint=e.getPoint();
Container container=contentPane;
Point containerPoint=SwingUtilities.convertPoint(glassPane,glassPanePoint,contentPane);
if (containerPoint.y<0)
{ //we're not in the content pane
if (containerPoint.y+menuBar.getHeight()>=0)
{
//The mouse event is over the menu bar.
//Could handle specially.
}
else
{
//The mouse event is over non-system window
//decorations, such as the ones provided by
//the Java look and feel.
//Could handle specially.
}
}
else
{
//The mouse event is probably over the content pane.
//Find out exactly which component it's over.
Component component=SwingUtilities.getDeepestComponentAt(container,containerPoint.x,containerPoint.y);
// if ((component!=null) && (component.equals(liveButton)))
if ((component!=null))
{
//Forward events over the check box.
Point componentPoint=SwingUtilities.convertPoint(glassPane,glassPanePoint,component);
component.dispatchEvent(new MouseEvent(component,e.getID(),e.getWhen(),e.getModifiers(),componentPoint.x,componentPoint.y,e.getClickCount(),e.isPopupTrigger()));
}
}
//Update the glass pane if requested.
if (repaint)
{
glassPane.setPoint(glassPanePoint);
glassPane.repaint();
}
}
}
而 Cursor_Crosshair.PNG 是这样的：
这是我对玻璃板绘画方法的看法。这被设置为表现得非常像设置自定义光标。默认 "arrow" 光标在显示自定义光标时隐藏，当组件具有其他光标集（例如文本框）时自定义光标隐藏。
不幸的是，它最终似乎需要相当多的 Swing 黑魔法，所以我不太喜欢它，但它似乎工作正常。我以前做过这样的游标，但它是为了更简单的东西，所以我没有 运行 涉及这些问题。
我 运行 遇到的一些问题是：
玻璃窗格拦截光标更改（例如在 SO here). The only solution I've been able to find is to override
Component.contains(int,int)to returnfalse(described here, shown here 上描述），但为什么它有效并且似乎没有破坏其他任何东西是神秘的。鼠标退出事件有时 return 组件边界内的一个位置，所以我认为没有可靠的方法知道鼠标何时离开 window除了使用计时器。
package mcve;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.net.*;
import java.io.*;
public class LargeCursor {
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame frame = new JFrame();
JPanel glass = new CustomGlassPane();
glass.add(new CursorPanel(), BorderLayout.CENTER);
frame.setGlassPane(glass);
// This next call is necessary because JFrame.setGlassPane delegates to the root pane:
// - https://docs.oracle.com/javase/9/docs/api/javax/swing/RootPaneContainer.html#setGlassPane-java.awt.Component-
// - http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/javax/swing/JFrame.java#l738
// And JRootPane.setGlassPane may call setVisible(false):
// - https://docs.oracle.com/javase/9/docs/api/javax/swing/JRootPane.html#setGlassPane-java.awt.Component-
// - http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/javax/swing/JRootPane.java#l663
glass.setVisible(true);
JPanel content = createTestPanel();
content.setCursor(BlankCursor.INSTANCE);
frame.setContentPane(content);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
static class CustomGlassPane extends JPanel {
CustomGlassPane() {
super(new BorderLayout());
super.setOpaque(false);
}
@Override
public boolean contains(int x, int y) {
return false;
}
}
static class CursorPanel extends JPanel {
final BufferedImage cursorImage;
Point mouseLocation;
CursorPanel() {
try {
cursorImage = createTransparentImage(
ImageIO.read(new URL("https://i.stack.imgur.com/9h2oI.png")));
} catch (IOException x) {
throw new UncheckedIOException(x);
}
setOpaque(false);
long mask = AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK;
Toolkit.getDefaultToolkit().addAWTEventListener((AWTEvent e) -> {
switch (e.getID()) {
case MouseEvent.MOUSE_ENTERED:
case MouseEvent.MOUSE_EXITED:
case MouseEvent.MOUSE_MOVED:
case MouseEvent.MOUSE_DRAGGED:
capturePoint((MouseEvent) e);
break;
}
}, mask);
// This turned out to be necessary, because
// the 'mouse exit' events don't always have
// a Point location which is outside the pane.
Timer timer = new Timer(100, (ActionEvent e) -> {
if (mouseLocation != null) {
Point p = MouseInfo.getPointerInfo().getLocation();
SwingUtilities.convertPointFromScreen(p, this);
if (!contains(p)) {
setMouseLocation(null);
}
}
});
timer.setRepeats(true);
timer.start();
}
void capturePoint(MouseEvent e) {
Component comp = e.getComponent();
Point onThis = SwingUtilities.convertPoint(comp, e.getPoint(), this);
boolean drawCursor = contains(onThis);
if (drawCursor) {
Window window = SwingUtilities.windowForComponent(this);
if (window instanceof JFrame) {
Container content = ((JFrame) window).getContentPane();
Point onContent = SwingUtilities.convertPoint(comp, e.getPoint(), content);
Component deepest = SwingUtilities.getDeepestComponentAt(content, onContent.x, onContent.y);
if (deepest != null) {
if (deepest.getCursor() != BlankCursor.INSTANCE) {
drawCursor = false;
}
}
}
}
setMouseLocation(drawCursor ? onThis : null);
}
void setMouseLocation(Point mouseLocation) {
this.mouseLocation = mouseLocation;
repaint();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (mouseLocation != null) {
int x = mouseLocation.x - (cursorImage.getWidth() / 2);
int y = mouseLocation.y - (cursorImage.getHeight() / 2);
g.drawImage(cursorImage, x, y, this);
}
}
}
static final class BlankCursor {
static final Cursor INSTANCE =
Toolkit.getDefaultToolkit().createCustomCursor(
new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB),
new Point(),
"BLANK");
}
static JPanel createTestPanel() {
JPanel panel = new JPanel(new GridLayout(3, 3));
panel.setBorder(BorderFactory.createEmptyBorder(100, 100, 100, 100));
for (int i = 0; i < 9; ++i) {
if ((i % 2) == 0) {
JTextField field = new JTextField("Text Field");
field.setHorizontalAlignment(JTextField.CENTER);
panel.add(field);
} else {
panel.add(new JButton("Button"));
}
}
return panel;
}
static BufferedImage createTransparentImage(BufferedImage img) {
BufferedImage copy =
GraphicsEnvironment.getLocalGraphicsEnvironment()
.getDefaultScreenDevice()
.getDefaultConfiguration()
.createCompatibleImage(img.getWidth(),
img.getHeight(),
Transparency.TRANSLUCENT);
for (int x = 0; x < img.getWidth(); ++x) {
for (int y = 0; y < img.getHeight(); ++y) {
int rgb = img.getRGB(x, y) & 0x00FFFFFF;
int bright = (((rgb >> 16) & 0xFF) + ((rgb >> 8) & 0xFF) + (rgb & 0xFF)) / 3;
int alpha = 255 - bright;
copy.setRGB(x, y, (alpha << 24) | rgb);
}
}
return copy;
}
}