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README.markdown

DWT Mac OS X

This is a temporarily repository for the Mac OS X port of DWT.

Note, this is a port of SWT 3.5.

Contributing

The plan is to finishing the Mac OS X port in this repository using D1 and Tango. When the port is finished we will move the repository to a new one and integrated it with the DWT repository. When that is done we will port the code to D2 and drop the support for D1.

There's an archive with prepared sources. These are the original Java files with a few modifications:

  • All trailing whitespace are removed
  • All tabs are converted to spaces
  • Imports are expanded
  • SWT is replaced with DWT in a few places

https://github.com/d-widget-toolkit/dwt-mac/downloads

Types

32/64 bits

We're aiming to support both 32 and 64bit systems in the same repository with this port.

Pointers

In Java a pointer is represented as an integer, usually declared as int /*long*/. This will mean int is used on 32bit systems and long is used on 64bit systems. These integer types are replaced with their actual native pointer type.

Integers

In many cases a type declared as int /*long*/ will mean an integer type with different size on different architectures. Here we again replace it with the actual native type, for example NSInteger, declared in dwt.internal.objc.cocoa.Cocoa.

Floating points

Floating point numbers declared as float /*double*/ should in most cases be replaced with CGFloat, declared in dwt.internal.c.Carbon.

The id type

The id type is a native used to store Objective-C objects. This is the only way to store an Objective-C object in D. In Objective-C this type can store any type of value, even non-objects.

See also The Objective-C Programming Language

There's also type named id in the Java code. This is a regular class containing a pointer to an Objective-C object, represented with an integer in Java and the native id type in D. This is the base class of all Objective-C classes in D/Java.

For more info about bridging Objective-C and D see: http://www.dsource.org/projects/dstep

For more info about Objective-C see:

Callbacks

The Callback class is completely remove and replaced with native function pointers.

The dwt.internal.cocoa.OS module

All native functions declared in the Java file are replaced with aliases in the D code. The actual function declaration are in another module, usually some of the following modules:

  • dwt.internal.c.Carbon
  • dwt.internal.c.custom
  • dwt.internal.objc.cocoa.Cocoa
  • dwt.internal.objc.runtime
  • tango.stdc.*

The same approach is used for integer values representing enums, but these are replaced with actual enums on a need to need basis.

The binding modules

Any module named binding contains bindings to C functions. These modules are rarely used directly but are instead brought into scope by aliasing or wrapping them into another module. For example class_addIvar is declared in dwt.internal.objc.bindings but are then later wrapped in dwt.internal.objc.runtime. class_addProtocol declared in dwt.internal.objc.bindings and is then aliased into scope in dwt.internal.objc.runtime.

The reason for this is to be able to wrap some methods and convert the arguments, i.e. converting D strings to C strings.