Scripts/HelloWorld

Download Example

The original PyObjC interface example by Steve Majewski.

A quick guide to runtime name mangling:

ObjC becomes Python [obj method ] obj.method() [obj method:arg ] obj.method_(arg) [obj method:arg1 withOtherArgs:arg2] obj.method_withOtherArgs_( arg1, arg2 )

NOTE: This is no longer the recommended way to build applications using the pyobjc bridge under with OS X. In particular, applications work much better if they are constructed in a proper app wrapper.

This app does demonstrate that it is possible to build full featured Cocoa apps without InterfaceBuilder.

Sources

#!/usr/bin/env pythonw
"""
The original PyObjC interface example by Steve Majewski.

A quick guide to runtime name mangling:

   ObjC             becomes              Python
   [obj method ]                         obj.method()
   [obj method:arg ]                     obj.method_(arg)
   [obj method:arg1 withOtherArgs:arg2]  obj.method_withOtherArgs_( arg1, arg2 )


NOTE:  This is no longer the recommended way to build applications
using the pyobjc bridge under with OS X.  In particular, applications
work much better if they are constructed in a proper app wrapper.

This app does demonstrate that it is possible to build full
featured Cocoa apps without InterfaceBuilder.
"""

from Cocoa import NSObject, NSApplication, NSApp, NSWindow, NSButton, NSSound
from PyObjCTools import AppHelper


class AppDelegate(NSObject):
    def applicationDidFinishLaunching_(self, aNotification):
        print("Hello, World!")

    def sayHello_(self, sender):
        print("Hello again, World!")


def main():
    app = NSApplication.sharedApplication()

    # we must keep a reference to the delegate object ourselves,
    # NSApp.setDelegate_() doesn't retain it. A local variable is
    # enough here.
    delegate = AppDelegate.alloc().init()
    NSApp().setDelegate_(delegate)

    win = NSWindow.alloc()
    frame = ((200.0, 300.0), (250.0, 100.0))
    win.initWithContentRect_styleMask_backing_defer_(frame, 15, 2, 0)
    win.setTitle_("HelloWorld")
    win.setLevel_(3)  # floating window

    hello = NSButton.alloc().initWithFrame_(((10.0, 10.0), (80.0, 80.0)))
    win.contentView().addSubview_(hello)
    hello.setBezelStyle_(4)
    hello.setTitle_("Hello!")
    hello.setTarget_(app.delegate())
    hello.setAction_("sayHello:")

    beep = NSSound.alloc()
    beep.initWithContentsOfFile_byReference_("/System/Library/Sounds/Tink.Aiff", 1)
    hello.setSound_(beep)

    bye = NSButton.alloc().initWithFrame_(((100.0, 10.0), (80.0, 80.0)))
    win.contentView().addSubview_(bye)
    bye.setBezelStyle_(4)
    bye.setTarget_(app)
    bye.setAction_("stop:")
    bye.setEnabled_(1)
    bye.setTitle_("Goodbye!")

    adios = NSSound.alloc()
    adios.initWithContentsOfFile_byReference_("/System/Library/Sounds/Basso.aiff", 1)
    bye.setSound_(adios)

    win.display()
    win.orderFrontRegardless()  # but this one does

    AppHelper.runEventLoop()


if __name__ == "__main__":
    main()