How To Implement Large Custom Cursor In Java?
Question
This question is related to my previous question : How To create A Large Size Custom Cursor In Java?
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After the previous question I found a way to create a large custom cursor, and the working answer is posted in my previous post. But in order to achieve it, I have to click a checkbox first, now I want to be able to create a large custom cursor without first need to click a checkbox, so I modified my code to look like the following without a checkbox :
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_Simple
{
static private MyGlassPane_Simple myGlassPane;
private static void createAndShowGUI()
{
JFrame frame=new JFrame("Demo_Large_Custom_Cursor_Simple");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// JCheckBox changeButton=new JCheckBox("Custom Cursor \"visible\"");
// changeButton.setSelected(false);
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);
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_Simple(changeButton,menuBar,frame.getContentPane());
myGlassPane=new MyGlassPane_Simple(menuBar,frame.getContentPane());
// changeButton.addItemListener(myGlassPane);
frame.setGlassPane(myGlassPane);
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) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); }
}
// We have to provide our own glass pane so that it can paint.
class MyGlassPane_Simple extends JComponent implements ItemListener
{
Point point;
// public MyGlassPane_Simple(AbstractButton aButton,JMenuBar menuBar,Container contentPane)
public MyGlassPane_Simple(JMenuBar menuBar,Container contentPane)
{
// CBListener_Simple listener=new CBListener_Simple(aButton,menuBar,this,contentPane);
CBListener_Simple listener=new CBListener_Simple(menuBar,this,contentPane);
addMouseListener(listener);
addMouseMotionListener(listener);
}
// 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; }
}
// Listen for all events that our check box is likely to be interested in. Redispatch them to the check box.
class CBListener_Simple extends MouseInputAdapter
{
Toolkit toolkit;
Component liveButton;
JMenuBar menuBar;
MyGlassPane_Simple glassPane;
Container contentPane;
// public CBListener_Simple(Component liveButton,JMenuBar menuBar,MyGlassPane_Simple glassPane,Container contentPane)
public CBListener_Simple(JMenuBar menuBar,MyGlassPane_Simple 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();
}
}
}
The 3 classes in this app are :
Demo_Large_Custom_Cursor_Simple.java
MyGlassPane_Simple.java
CBListener_Simple.java
They are all the classes needed to run this demo app.
The Cursor_Crosshair.PNG image looks like this :
But, it's not showing large custom cursor any more, I wonder what I did wrong, what should I do based on this existing code to show large custom cursor when mouse enters the app window ?
1 answers
solution1
0 ACCPTED 2018-07-17 16:07:57
Thanks to @Radiodef for the inspirational answer to my previous question at : How To create A Large Size Custom Cursor In Java?
Here is a modified version of the answer that fits my requirements :
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
public class Demo_Large_Custom_Cursor_Simple
{
static Insets An_Inset=new Insets(0,0,0,0);
private static void createAndShowGUI()
{
JFrame frame=new JFrame("Demo_Large_Custom_Cursor_Simple");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container contentPane=frame.getContentPane();
contentPane.setLayout(new FlowLayout());
contentPane.setPreferredSize(new Dimension(2*80+15,2*80+15));
int Font_Size=6;
String Color="blue",Font_Face="Monospaced",
Token_1="<Html>"+
" <Table Border=0 Cellspacing=3 Cellpadding=3>"+
" <Tr><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">1</Font></Td><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">A</Font></Td></Tr>"+
" <Tr><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">\u2664</Font></Td><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">\u203b</Font></Td></Tr>"+
" </Table>"+
"</Html>",
Token_2="<Html>"+
" <Table Border=0 Cellspacing=3 Cellpadding=3>"+
" <Tr><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">2</Font></Td><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">B</Font></Td></Tr>"+
" <Tr><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">\u2660</Font></Td><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">\u2638</Font></Td></Tr>"+
" </Table>"+
"</Html>",
Token_3="<Html>"+
" <Table Border=0 Cellspacing=3 Cellpadding=3>"+
" <Tr><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">3</Font></Td><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">C</Font></Td></Tr>"+
" <Tr><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">\u2667</Font></Td><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">\u2668</Font></Td></Tr>"+
" </Table>"+
"</Html>",
Token_4="<Html>"+
" <Table Border=0 Cellspacing=3 Cellpadding=3>"+
" <Tr><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">4</Font></Td><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">D</Font></Td></Tr>"+
" <Tr><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">\u2663</Font></Td><Td Align=Center><Font Size="+Font_Size+" Color="+Color+">\u262f</Font></Td></Tr>"+
" </Table>"+
"</Html>";
JButton Button_1=new JButton(Token_1);
Button_1.setPreferredSize(new Dimension(80,80));
Button_1.setFont(new Font(Font_Face,0,16));
Button_1.setMargin(An_Inset);
Button_1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { Out(Button_1.getText().replaceAll("<[^>]*>"," ").replaceAll("( )+"," ")); } });
contentPane.add(Button_1);
JButton Button_2=new JButton(Token_2);
Button_2.setPreferredSize(new Dimension(80,80));
Button_2.setFont(new Font(Font_Face,0,16));
Button_2.setMargin(An_Inset);
Button_2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { Out(Button_2.getText().replaceAll("<[^>]*>"," ").replaceAll("( )+"," ")); } });
contentPane.add(Button_2);
JButton Button_3=new JButton(Token_3);
Button_3.setPreferredSize(new Dimension(80,80));
Button_3.setFont(new Font(Font_Face,0,16));
Button_3.setMargin(An_Inset);
Button_3.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { Out(Button_3.getText().replaceAll("<[^>]*>"," ").replaceAll("( )+"," ")); } });
contentPane.add(Button_3);
JButton Button_4=new JButton(Token_4);
Button_4.setPreferredSize(new Dimension(80,80));
Button_4.setFont(new Font(Font_Face,0,16));
Button_4.setMargin(An_Inset);
Button_4.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { Out(Button_4.getText().replaceAll("<[^>]*>"," ").replaceAll("( )+"," ")); } });
contentPane.add(Button_4);
JMenuBar menuBar=new JMenuBar();
JMenu menu=new JMenu("Menu");
menu.add(new JMenuItem("Do nothing"));
menuBar.add(menu);
frame.setJMenuBar(menuBar);
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);
frame.setLocationRelativeTo(null);
frame.pack();
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=ImageIO.read(new File("C:/Cursor_Crosshair.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) 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)+1;
int y=mouseLocation.y-(cursorImage.getHeight()/2)+1;
g.drawImage(cursorImage,x,y,this);
}
}
}
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) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); }
}
Cursor_Crosshair.PNG looks like this :
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