CPCursor implementation tested in WebKit/FF/IE/Opera. See comments in the file for more details.

AppKit/CPCursor.j

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+/*
+Testing browsers:
+    WebKit r50235 (Safari 4.0.3+)
+    FireFox 3.5
+    Opera 10.0.0
+
+Implemented class methods:
+    Webkit : All
+    IE     : All
+    FireFox Win : All
+    FireFox Mac : All except closedHandCursor disappearingItemCursor // Firefox mac does not support url cursors
+    Opera       : All except resizeLeftRightCursor resizeUpDownCursor operationNotAllowedCursor dragCopyCursor dragLinkCursor contextualMenuCursor openHandCursor closedHandCursor disappearingItemCursor // Opera does not support url cursors so these won't work with images
+*/
+
+var currentCursor = nil,
+    cursorStack = [],
+    cursors = {},
+    cursorURLFormat = nil;
+
+@implementation CPCursor : CPObject
+{
+    CPString _cssString;
+    BOOL     _isSetOnMouseEntered @accessors(readwrite, getter=isSetOnMouseEntered, setter=setOnMouseEntered:);
+    BOOL     _isSetOnMouseExited @accessors(readwrite, getter=isSetOnMouseExited, setter=setOnMouseExited:);
+}
+
++ (CPCursor)currentCursor
+{
+    return currentCursor;
+}
+
+- (id)initWithCSSString:(CPString)aString
+{
+    self = [super init];
+    _cssString = aString;    
+    return self;
+}
+
++ (CPCursor)cursorWithCSSString:(CPString)cssString
+{
+    var cursor = cursors[cssString];
+
+    if (typeof cursor == 'undefined')
+    {
+        cursor = [[CPCursor alloc] initWithCSSString:cssString];
+        cursors[cssString] = cursor;
+    }
+
+    return cursor;
+}
+
++ (CPCursor)cursorWithImageNamed:(CPString)imageName
+{
+    if (!cursorURLFormat)
+    {
+        cursorURLFormat = @"url(" + [[CPBundle bundleForClass:self] resourcePath] + @"/CPCursor/%@.cur)";
+        if CPBrowserIsEngine(CPGeckoBrowserEngine)
+            cursorURLFormat+ = ", default";
+    }
+    
+    var url = [CPString stringWithFormat:cursorURLFormat, imageName];
+    
+    return [[CPCursor alloc] initWithCSSString:url];
+}
+
+- (CPString)_cssString
+{
+    return _cssString;
+}
+
++ (CPCursor)arrowCursor
+{
+    return [CPCursor cursorWithCSSString:@"default"]; // WebKit | FF | opera | IE
+}
+
++ (CPCursor)crosshairCursor
+{
+    return [CPCursor cursorWithCSSString:@"crosshair"]; // WebKit | FF | opera | IE
+}
+
++ (CPCursor)IBeamCursor
+{
+    return [CPCursor cursorWithCSSString:@"text"]; // WebKit | FF | opera | IE
+}
+
++ (CPCursor)pointingHandCursor
+{
+    return [CPCursor cursorWithCSSString:@"pointer"]; // WebKit | FF | opera | IE
+}
+
++ (CPCursor)resizeDownCursor
+{
+    if (CPBrowserIsEngine(CPInternetExplorerBrowserEngine))
+        return [CPCursor cursorWithImageNamed:CPStringFromSelector(_cmd)];
+        
+    return [CPCursor cursorWithCSSString:"s-resize"]; // WebKit | FF | opera
+}
+
++ (CPCursor)resizeUpCursor
+{
+    if (CPBrowserIsEngine(CPInternetExplorerBrowserEngine))
+        return [CPCursor cursorWithImageNamed:CPStringFromSelector(_cmd)];
+
+    return [CPCursor cursorWithCSSString:@"n-resize"]; // WebKit | FF | opera
+}
+
++ (CPCursor)resizeLeftCursor
+{
+    if (CPBrowserIsEngine(CPInternetExplorerBrowserEngine))
+        return [CPCursor cursorWithImageNamed:CPStringFromSelector(_cmd)];
+
+    return [CPCursor cursorWithCSSString:@"w-resize"]; // WebKit | FF | opera
+}
+
++ (CPCursor)resizeRightCursor
+{
+    if (CPBrowserIsEngine(CPInternetExplorerBrowserEngine))
+        return [CPCursor cursorWithImageNamed:CPStringFromSelector(_cmd)];
+
+    return [CPCursor cursorWithCSSString:@"e-resize"]; // WebKit | FF | opera
+}
+
++ (CPCursor)resizeLeftRightCursor
+{
+    return [CPCursor cursorWithCSSString:@"col-resize"]; // WebKit | FF | IE
+}
+
++ (CPCursor)resizeUpDownCursor
+{
+    return [CPCursor cursorWithCSSString:@"row-resize"]; // WebKit | FF | IE
+}
+
++ (CPCursor)operationNotAllowedCursor
+{
+    return [CPCursor cursorWithCSSString:@"not-allowed"]; // WebKit | FF | IE
+}
+
++ (CPCursor)dragCopyCursor
+{
+    if (CPBrowserIsEngine(CPInternetExplorerBrowserEngine))
+        return [CPCursor cursorWithImageNamed:CPStringFromSelector(_cmd)];
+
+    return [CPCursor cursorWithCSSString:@"copy"]; // WebKit | FF
+}
+
++ (CPCursor)dragLinkCursor
+{
+    if (CPBrowserIsEngine(CPInternetExplorerBrowserEngine))
+        return [CPCursor cursorWithImageNamed:CPStringFromSelector(_cmd)];
+
+    return [CPCursor cursorWithCSSString:@"alias"]; // WebKit | FF
+}
+
++ (CPCursor)contextualMenuCursor
+{
+    if (CPBrowserIsEngine(CPInternetExplorerBrowserEngine))
+        return [CPCursor cursorWithImageNamed:CPStringFromSelector(_cmd)];
+
+    return [CPCursor cursorWithCSSString:@"context-menu"]; // WebKit | FF Mac . Not impl FF Win.
+}
+
++ (CPCursor)openHandCursor
+{
+    if (CPBrowserIsEngine(CPWebKitBrowserEngine))
+        return [CPCursor cursorWithCSSString:@"-webkit-grab"];
+    else if (CPBrowserIsEngine(CPGeckoBrowserEngine) || CPBrowserIsEngine(CPOperaBrowserEngine))
+        return [CPCursor cursorWithCSSString:@"move"];
+
+    return [CPCursor cursorWithImageNamed:CPStringFromSelector(_cmd)]; // WebKit only. move in FFMac|Opera 
+}
+
++ (CPCursor)closedHandCursor
+{
+    if (CPBrowserIsEngine(CPWebKitBrowserEngine))
+        return [CPCursor cursorWithCSSString:@"-webkit-grabbing"];
+
+    return [CPCursor cursorWithImageNamed:CPStringFromSelector(_cmd)]; // WebKit only 
+}
+
++ (CPCursor)disappearingItemCursor
+{
+    return [CPCursor cursorWithImageNamed:CPStringFromSelector(_cmd)]; // None
+}
+
++ (void)hide
+{
+    document.body.style.cursor = 'none'; // Not supported in IE
+}
+
++ (void)unhide
+{
+    document.body.style.cursor = [currentCursor _cssString];
+}
+
++ (void)setHiddenUntilMouseMoves:(BOOL)flag
+{
+    if (flag)
+        [CPCursor hide];
+    else
+        [CPCursor unhide];
+}
+
+- (id)initWithImage:(CPImage)image hotSpot:(CPPoint)hotSpot
+{
+    return [self initWithCSSString:"url(" + [image filename] + ")"];
+}
+
+- (void)mouseEntered:(CPEvent)event
+{
+}
+
+- (void)mouseExited:(CPEvent)event
+{
+}
+
+- (void)set
+{
+    document.body.style.cursor = _cssString;
+    currentCursor = self; 
+}
+
+- (void)push
+{
+    currentCursor = cursorStack.push(self);
+}
+
+- (void)pop
+{
+    [CPCursor pop];
+}
+
++ (void)pop
+{
+    if (cursorStack.length > 1)
+    {
+        cursorStack.pop();
+        currentCursor = cursorStack[cursorStack.length - 1];
+    }
+}
+
+- (id)initWithCoder:(CPCoder)coder
+{
+    self = [super init];
+    _cssString = [coder decodeObjectForKey:@"CPCursorNameKey"];
+    return self;
+}
+
+- (void)encodeWithCoder:(CPCoder)coder
+{
+    [coder encodeObject:_cssString forKey:@"CPCursorNameKey"];
+}
+
+@end
+

AppKit/Resources/CPCursor/test.html

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+<html>
+<head>
+</head>
+<body>
+<div>Test custom cursors with .cur images.</div>
+<div style="width: 20px; height: 20px; margin: 10px; background: #ddd; cursor: url(disappearingItemCursor.cur), default">disappearingItemCursor</div>
+<div style="width: 20px; height: 20px; margin: 10px; background: #ddd; cursor: url(closedHandCursor.cur), default">closedHandCursor</div>
+<div style="width: 20px; height: 20px; margin: 10px; background: #ddd; cursor: url(contextMenuCursor.cur), default">contextMenuCursor</div>
+<div style="width: 20px; height: 20px; margin: 10px; background: #ddd; cursor: url(dragCopyCursor.cur), default">dragCopyCursor</div>
+<div style="width: 20px; height: 20px; margin: 10px; background: #ddd; cursor: url(dragLinkCursor.cur), default">dragLinkCursor</div>
+<div style="width: 20px; height: 20px; margin: 10px; background: #ddd; cursor: url(openHandCursor.cur), default">openHandCursor</div>
+<div style="width: 20px; height: 20px; margin: 10px; background: #ddd; cursor: url(resizeDownCursor.cur), default">resizeDownCursor</div>
+<div style="width: 20px; height: 20px; margin: 10px; background: #ddd; cursor: url(resizeLeftCursor.cur), default">resizeLeftCursor</div>
+<div style="width: 20px; height: 20px; margin: 10px; background: #ddd; cursor: url(resizeRightCursor.cur), default">resizeRightCursor</div>
+<div style="width: 20px; height: 20px; margin: 10px; background: #ddd; cursor: url(resizeUpCursor.cur), default">resizeUpCursor</div>
+</body>
+</html>
+

Tests/CPCursor/AppController.j

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+/*
+ * AppController.j
+ * CursorTest
+ *
+ * Created by You on November 6, 2009.
+ * Copyright 2009, Your Company All rights reserved.
+ */
+
+@import <Foundation/CPObject.j>
+
+var selectors = ["pointingHandCursor", "resizeDownCursor", "resizeLeftCursor", "resizeRightCursor", "resizeUpCursor", "resizeLeftRightCursor", "resizeUpDownCursor", "operationNotAllowedCursor", "dragCopyCursor", "dragLinkCursor", "contextualMenuCursor", "openHandCursor", "closedHandCursor", "disappearingItemCursor"];
+
+@implementation AppController : CPObject
+{
+    CPPopUpButton popup;
+}
+
+- (void)applicationDidFinishLaunching:(CPNotification)aNotification
+{
+    var theWindow = [[CPWindow alloc] initWithContentRect:CGRectMakeZero() styleMask:CPBorderlessBridgeWindowMask],
+        contentView = [theWindow contentView];
+
+    popup = [[CPPopUpButton alloc] initWithFrame:CGRectMake(100,100,150,24)];
+    var menu = [popup menu];
+    for (var i = 0 , count = [selectors count];i < count;i++)
+    {   
+        var selector = selectors[i];
+        var item = [[CPMenuItem alloc] initWithTitle:selector action:nil keyEquivalent:@""];
+        [item setTarget:self];
+        [menu addItem:item];
+    }
+    [contentView addSubview:popup];
+    
+    var button = [[CPButton alloc] initWithFrame:CGRectMake(270,100,100,24)];
+    [button setAction:@selector(setCursor:)];
+    [button setTarget:self];
+    [button setTitle:@"set Cursor"];
+    [contentView addSubview:button];
+    
+    [theWindow orderFront:self];
+    // Uncomment the following line to turn on the standard menu bar.
+    //[CPMenu setMenuBarVisible:YES];
+}
+
+-(void)setCursor:(id)sender
+{
+    var selector = CPSelectorFromString([popup titleOfSelectedItem]);
+    var cursor = [CPCursor performSelector:selector];
+    [cursor set];
+}
+
+@end

Tests/CPCursor/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CPApplicationDelegateClass</key>
+	<string>AppController</string>
+	<key>CPBundleName</key>
+	<string>CursorTest</string>
+	<key>CPPrincipalClass</key>
+	<string>CPApplication</string>
+</dict>
+</plist>

Tests/CPCursor/Jakefile

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+/*
+ * Jakefile
+ * CursorTest
+ *
+ * Created by You on November 6, 2009.
+ * Copyright 2009, Your Company All rights reserved.
+ */
+
+var ENV = require("system").env,
+    FILE = require("file"),
+    task = require("jake").task,
+    FileList = require("jake").FileList,
+    app = require("cappuccino/jake").app,
+    configuration = ENV["CONFIG"] || ENV["CONFIGURATION"] || ENV["c"] || "Debug";
+
+app ("CursorTest", function(task)
+{
+    task.setBuildIntermediatesPath(FILE.join("Build", "CursorTest.build", configuration));
+    task.setBuildPath(FILE.join("Build", configuration));
+
+    task.setProductName("CursorTest");
+    task.setIdentifier("com.yourcompany.CursorTest");
+    task.setVersion("1.0");
+    task.setAuthor("Your Company");
+    task.setEmail("feedback @nospam@ yourcompany.com");
+    task.setSummary("CursorTest");
+    task.setSources(new FileList("**/*.j"));
+    task.setResources(new FileList("Resources/*"));
+    task.setIndexFilePath("index.html");
+    task.setInfoPlistPath("Info.plist");
+
+    if (configuration === "Debug")
+        task.setCompilerFlags("-DDEBUG -g");
+    else
+        task.setCompilerFlags("-O");
+});
+
+task ("default", ["CursorTest"]);

Tests/CPCursor/index-debug.html

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html
+    PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns = "http://www.w3.org/1999/xhtml" xml:lang = "en" lang = "en">
+<!--
+ index-debug.html
+ CursorTest
+
+ Created by You on November 6, 2009.
+ Copyright 2009, Your Company All rights reserved.
+-->
+    <head>
+        <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
+
+        <title>CursorTest</title>
+
+        <script type = "text/javascript">
+            OBJJ_MAIN_FILE = "main.j";
+            OBJJ_INCLUDE_PATHS = ["Frameworks/Debug", "Frameworks", "SomethingElse"];
+        </script>
+        
+        <script src = "Frameworks/Debug/Objective-J/Objective-J.js" type = "text/javascript"></script>
+        
+        <script type = "text/javascript">
+            objj_msgSend_reset();
+            
+            // DEBUG OPTIONS:
+            
+            // Uncomment to enable printing of backtraces on exceptions:
+            //objj_msgSend_decorate(objj_backtrace_decorator);
+            
+            // Uncomment to enable runtime type checking:
+            //objj_msgSend_decorate(objj_typecheck_decorator);
+            
+            // Uncomment (along with both above) to print backtraces on type check errors:
+            //objj_typecheck_prints_backtrace = true;
+        </script>
+        
+        <style type = "text/css">
+            body{margin:0; padding:0;}
+            #container {position: absolute; top:50%; left:50%;}
+            #content {width:800px; text-align:center; margin-left: -400px; height:50px; margin-top:-25px; line-height: 50px;}
+            #content {font-family: "Helvetica", "Arial", sans-serif; font-size: 18px; color: black; text-shadow: 0px 1px 0px white; }
+            #loadgraphic {margin-right: 0.2em; margin-bottom:-2px;}
+        </style>
+
+        <!--[if lt IE 7]>
+        <STYLE type="text/css">
+            #container { position: relative; top: 50%; }
+            #content { position: relative;}
+        </STYLE>
+        <![endif]-->
+
+    </head>
+
+    <body style="">
+        <div id="loadingcontainer" style=" background-color: #eeeeee; overflow:hidden; width:100%; height:100%; position: absolute; top: 0; left: 0;">
+            <script type = "text/javascript">
+                document.write("<div id='container'><p id='content'>" +
+                               "<img id='loadgraphic' width='16' height='16' src='Resources/spinner.gif' /> " +
+                               "Loading CursorTest...</p></div>");
+            </script>
+    
+            <noscript>
+                <div id="container">
+                    <div style="width: 440px; padding: 10px 25px 20px 25px; font-family: sans-serif; background-color: #ffffff; position: relative; left: -245px; top: -120px; text-align: center; -moz-border-radius: 20px; -webkit-border-radius: 20px; color: #555555">
+                        <p style="line-height: 1.4em;">JavaScript is required for this site to work correctly but is either disabled or not supported by your browser.</p>
+                        <p style="font-size:120%; padding:10px;"><a href="http://cappuccino.org/noscript">Show me how to enable JavaScript</a></p>
+                        <p style="font-size:80%;">You may want to upgrade to a newer browser while you're at it:</p>
+                        <ul style="margin:0;padding:0; text-align: center; font-size:80%;" >
+                            <li style="display: inline;"><a href="http://www.apple.com/safari/download/">Safari</a></li>
+                            <li style="display: inline;"><a href="http://www.mozilla.com/en-US/firefox/">Firefox</a></li>
+                            <li style="display: inline;"><a href="http://www.google.com/chrome/">Chrome</a></li>
+                            <li style="display: inline;"><a href="http://www.opera.com/download/">Opera</a></li>
+                            <li style="display: inline;"><a href="http://www.microsoft.com/windows/downloads/ie/getitnow.mspx">Internet Explorer</a></li>
+                        </ul>
+                    </div>
+                </div>
+            </noscript>
+        </div>
+    </body>
+
+</html>

Tests/CPCursor/index.html

@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html
+    PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns = "http://www.w3.org/1999/xhtml" xml:lang = "en" lang = "en">
+<!--
+ index.html
+ CursorTest
+
+ Created by You on November 6, 2009.
+ Copyright 2009, Your Company All rights reserved.
+-->
+    <head>
+        <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
+
+        <title>CursorTest</title>
+
+        <script type = "text/javascript">
+            OBJJ_MAIN_FILE = "main.j";
+        </script>
+        
+        <script src = "Frameworks/Objective-J/Objective-J.js" type = "text/javascript"></script>
+
+        <style type = "text/css">
+            body{margin:0; padding:0;}
+            #container {position: absolute; top:50%; left:50%;}
+            #content {width:800px; text-align:center; margin-left: -400px; height:50px; margin-top:-25px; line-height: 50px;}
+            #content {font-family: "Helvetica", "Arial", sans-serif; font-size: 18px; color: black; text-shadow: 0px 1px 0px white; }
+            #loadgraphic {margin-right: 0.2em; margin-bottom:-2px;}
+        </style>
+
+        <!--[if lt IE 7]>
+        <STYLE type="text/css">
+            #container { position: relative; top: 50%; }
+            #content { position: relative;}
+        </STYLE>
+        <![endif]-->
+
+    </head>
+
+    <body style="">
+        <div id="loadingcontainer" style=" background-color: #eeeeee; overflow:hidden; width:100%; height:100%; position: absolute; top: 0; left: 0;">
+            <script type = "text/javascript">
+                document.write("<div id='container'><p id='content'>" +
+                               "<img id='loadgraphic' width='16' height='16' src='Resources/spinner.gif' /> " +
+                               "Loading CursorTest...</p></div>");
+            </script>
+    
+            <noscript>
+                <div id="container">
+                    <div style="width: 440px; padding: 10px 25px 20px 25px; font-family: sans-serif; background-color: #ffffff; position: relative; left: -245px; top: -120px; text-align: center; -moz-border-radius: 20px; -webkit-border-radius: 20px; color: #555555">
+                        <p style="line-height: 1.4em;">JavaScript is required for this site to work correctly but is either disabled or not supported by your browser.</p>
+                        <p style="font-size:120%; padding:10px;"><a href="http://cappuccino.org/noscript">Show me how to enable JavaScript</a></p>
+                        <p style="font-size:80%;">You may want to upgrade to a newer browser while you're at it:</p>
+                        <ul style="margin:0;padding:0; text-align: center; font-size:80%;" >
+                            <li style="display: inline;"><a href="http://www.apple.com/safari/download/">Safari</a></li>
+                            <li style="display: inline;"><a href="http://www.mozilla.com/en-US/firefox/">Firefox</a></li>
+                            <li style="display: inline;"><a href="http://www.google.com/chrome/">Chrome</a></li>
+                            <li style="display: inline;"><a href="http://www.opera.com/download/">Opera</a></li>
+                            <li style="display: inline;"><a href="http://www.microsoft.com/windows/downloads/ie/getitnow.mspx">Internet Explorer</a></li>
+                        </ul>
+                    </div>
+                </div>
+            </noscript>
+        </div>
+    </body>
+
+</html>
+

Tests/CPCursor/main.j

@@ -0,0 +1,18 @@
+/*
+ * AppController.j
+ * CursorTest
+ *
+ * Created by You on November 6, 2009.
+ * Copyright 2009, Your Company All rights reserved.
+ */
+
+@import <Foundation/Foundation.j>
+@import <AppKit/AppKit.j>
+
+@import "AppController.j"
+
+
+function main(args, namedArgs)
+{
+    CPApplicationMain(args, namedArgs);
+}