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X Review Mac OS X Roots: Next X Review Application • Distributed window system Widget Set • Server is the user’s Terminal WM Xt Intrinsics • Client runs the application Xlib Xlib • Highly modular • (exchange WM, Widget Set) X Server BWS • Available for virtually every OS HW • Very successful in the UNIX world (with Motif) • Many Open Source implementations available • Xt intrinsics already allow OO GUI application programming Jan Borchers 1 media computing group Jan Borchers 2 media computing group Mac OS X Roots: NeXT • 1985 Apple kicks out Jobs, who founds NeXT • 1988 NeXTSTEP 0.8: 68k, Mach kernel, 4.3BSD, Display PostScript, new Objective-C, platform for first web browser at CERN • 1990 NeXTSTEP 2.0: Interface Builder (OO) • 1993 Intel, SPARC, HP PA-RISC support (fat binaries), NeXT hardware dead • NeXT&Sun: OPENSTEP, used by SunOS, HP-UX, MacOS, also on Windows NT, GNUstep Jan Borchers 3 media computing group Jan Borchers 4 media computing group Mac OS X Roots: It’s spelled “Ten” NeXT Mac OS X: Architecture Apps UITK Cocoa, Carbon, Java • 1996 Apple purchases NeXT, Jobs back at Apple, begins replacing Mac OS towards NeXTSTEP WM WindowServer (user-level process) • 1999 Apple releases Mac OS X Preview BWS ! Mac OS X is directly derived from NeXTSTEP/ OPENSTEP (Mach/BSD, Objective-C, Cocoa, Interface GEL Quartz 2D / Core Graphics, IOKit Builder, NetInfo), and combines this with other Apple HW technologies (UI, Multimedia) 6 Jan Borchers 5 media computing group Jan Borchers media computing group Base Operating System Graphics and Event Library • Quartz 2D / Core Graphics, Display PDF • Roots: NeWS, NeXTSTEP (Display PostScript) • Vector-based, resolution-independent • Darwin (Open Source for PowerPC+Intel) • Quartz Extreme: GPU-based compositing (pipe • Based on a Mach microkernel + BSD Unix entire screen through OpenGL if available) • Protected memory, preemptive multitasking • Quartz Extreme 2D / QuartzGL: GPU-based UI • Single application cannot corrupt/freeze entire system rendering (still experimental) • Vista’s XPS is similar to (Display) PDF • The Event Library is contained in IO Kit Jan Borchers 7 media computing group Jan Borchers 8 media computing group User Interface Toolkit Demo: Quartz Extreme • Cocoa AppKit, OO framework • Implements Aqua Look&Feel • Other part of Cocoa (Foundation framework) contains threads, sockets, etc. • Written in Objective-C Jan Borchers 9 media computing group Jan Borchers 10 media computing group Java Carbon Cocoa BSD (JDK) QuickTime Application Services * Multi-API Problems Core Services Kernel Environment • Mac OS X has tried to please everyone • Problem: High cost for supporting many APIs • Cocoa is the recommended API for Mac OS X • Consequences in 2006: • Can be used with Objective-C or Java* • No new Java bindings for new Cocoa features in Mac OS X 10.5 • Java SE 6 SDK is used for 100% Java/Swing applications and beyond (= “Use Objective-C!”) • Carbon is an updated version of the old Macintosh Toolbox • New Intel Macs do not support Classic Mac OS emulation anymore (= “Classic’s dead!”) • Used to easily port existing applications • Carbon apps run on Mac OS 9 and Mac OS X • But: New bridges for Ruby and Python since Leopard • BSD is used for existing standard Unix applications • WebObjects for web-based services Jan Borchers 11 media computing group Jan Borchers 12 media computing group Event Handling • Similar to our Reference Model • Window Server distributes events to per-application (really per- process) queues Steve Jobs burying Mac OS 9 at WWDC 2002 (personal photo) Jan Borchers 13 media computing group Jan Borchers 14 media computing group Objective-C: Objective-C New C Language Constructs • Implementation language of the Cocoa framework • Created in 1983 to combine OO principles with C • status = [socket connectToAddress:127.0.0.1 withPort:80] is analogous to Java’s • Inspired by Smalltalk status = socket.connectToAddressWithPort(127.0.0.1, 80) • In its concepts very similar to Java, unlike C++ • — for instance methods, + for class methods • Dynamic typing, binding, and loading • id corresponds to Object, self corresponds to this • Protocols are analogous to Java’s interfaces • @ compiler directives • Classes are objects of type Class • Reflection possible (not in C++) • @interface..@end, @implementation..@end,… • Introduces few new language constructs to C • Interface categories allow transparent subclassing Jan Borchers 15 media computing group Jan Borchers 16 media computing group Dynamic Typing/Binding/Loading • C++ is a static language, Java and Obj-C are dynamic • Calling known methods of a subclass • Example: Building objects from data read from a file • In C++, you cannot directly call a method defined in a subclass Demo: Dynamic Binding - You would have to do a dynamic_cast<> • Obj-C (and Java) move this check to run-time • Fragile Base Class Problem • To add a method to a superclass, all subclasses must be recompiled • In C++, a superclass must contain all methods any subclass will use • Dynamic Binding avoids bloated superclasses, and minimizes recompilation due to this problem Jan Borchers 17 media computing group Jan Borchers 18 media computing group Objective-C 2.0 (since Leopard) Manual Memory Management • Supports automatic accessor method generation for • Reference counting object properties • Each object stores how often it is referenced by other objects • Allows Java-like short-hand syntax to access • If it is not used anymore, call dealloc (free memory) properties • Only five methods affect reference counts • [object setName:newName]; • alloc—allocate object and set reference count to 1 object.name = newName; • copy—copy an object. Copy will have reference count 1 • Features an optional garbage collection • retain—increment reference count • only works for Objective-C Objects • release—decrement reference count • you still have to manage any C pointers yourself • autorelease—automatically decrement reference count sometime • Supports fast enumeration of collections after the current method • for (object in list) [object doSomething]; Jan Borchers 19 media computing group Jan Borchers 20 media computing group Cocoa Cocoa Class Hierarchy NSObject •! Fairly flat hierarchy • The UITK (and general toolkit) of Mac OS X NSEvent • Evolved out of NeXTSTEP NSResponder •! Reason: Delegates, and • Cocoa’s class names still give away its heritage (NSObject,…) NSWindow ! categories can be used to mix NSView ! in functionality • Two main parts NSControl • Foundation: Basic programming support NSButton etc. →!no deep subclassing NSApplication ! required - NSObject, values, strings, collections, OS services, notifications, archiving, NSCell (lightweight controls) Objective-C language services, scripting, distributed objects • Full hierarchy: NSMenu • AppKit: Aqua interface NSMenuItem ! see Online Help in Xcode - Interface, fonts, graphics, color, documents, printing, OS support, international support, InterfaceBuilder support etc. - Largest part (over 100) are interface widgets Jan Borchers 21 media computing group Jan Borchers 22 media computing group Example: NSTableView Delegate Methods Delegates Moving and resizing columns Editing a cell – tableView:didDragTableColumn: – tableView: shouldEditTableColumn:row: – tableViewColumnDidMove: Displaying a cell – tableViewColumnDidResize: • Similar to Listeners in Java – tableView: • A delegate is a class whose methods are called from Selecting in table willDisplayCell:forTableColumn:row: Displaying tooltips another class that wants to plan for extending its – selectionShouldChangeInTableView: – tableView:shouldSelectRow: – tableView: functionality toolTipForCell:rect:tableColumn: – tableView:shouldSelectTableColumn: row:mouseLocation: • E.g., you can write a delegate class for NSTableView that will get – tableViewSelectionIsChanging: Allowing variable height rows called when the user changes the width of a column – tableViewSelectionDidChange: – tableView:heightOfRow: • Delegates solve the fragile base class problem Responding to mouse events • If NSTableView is changed, the delegate class doesn’t need to be – tableView:didClickTableColumn: recompiled – tableView: mouseDownInHeaderOfTableColumn: Jan Borchers 23 media computing group Jan Borchers 24 media computing group Categories: Extending a class Protocols without subclassing • Example: Add a “find&replace” method to NSString • Could subclass “MyNSString”—but then have to change all code to use that new class • Could change NSString itself—but that would require access to the source code for that class (and recompiling, rebinding any code using it,…) • Similar to Java’s interfaces • Instead: Create a category “NSStringExtensions”: • Mostly replace the need for multiple inheritance @interface NSString (NSStringExtensions) - (NSString *)find:(NSString *)findString replaceWith:(NSString *)replaceString; @end • Any code using NSString can now use the find:replaceWith: method • An advantage of the Dynamic Loading possible with Objective-C Jan Borchers 25 media computing group Jan Borchers 26 media computing group Events and Actions • Events are generated by user or system (e.g., periodic events) Demo: Categories • Corresponds to input “I” from our formal widget model • Actions are generated by objects (e.g., menus) in response to lower-level events • Corresponds to actions “A” from our formal widget model • InterfaceBuilder lets developer connect actions to custom objects (e.g., from a button to a custom class), using “IBAction” constant in the source Jan Borchers 27 media computing group Jan Borchers 28
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