Scripts/HelloWorld

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HelloWorld.py

#!/usr/bin/env pythonw

# HelloWorld.py
#
# 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()