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// 27 february 2014
package main
import (
"fmt"
"unsafe"
"time"
)
// #cgo LDFLAGS: -lobjc -framework Foundation -framework AppKit
// #include <stdlib.h>
// #include "objc_darwin.h"
// Class NilClass = Nil; /* for newtypes.go */
// id Nilid = nil;
import "C"
func objc_getClass(class string) C.id {
cclass := C.CString(class)
defer C.free(unsafe.Pointer(cclass))
return C.objc_getClass(cclass)
}
func sel_getUid(sel string) C.SEL {
csel := C.CString(sel)
defer C.free(unsafe.Pointer(csel))
return C.sel_getUid(csel)
}
var NSApp C.id
var defNC C.id
var delegate C.id
var notesel C.SEL
func init() {
// need an NSApplication first - see https://github.com/TooTallNate/NodObjC/issues/21
NSApplication := objc_getClass("NSApplication")
sharedApplication := sel_getUid("sharedApplication")
NSApp = C.objc_msgSend_noargs(NSApplication, sharedApplication)
defNC = C.objc_msgSend_noargs(
objc_getClass("NSNotificationCenter"),
sel_getUid("defaultCenter"))
selW := sel_getUid("windowShouldClose:")
selB := sel_getUid("buttonClicked:")
selN := sel_getUid("gotNotification:")
mk("hello", selW, selB, selN)
delegate = C.objc_msgSend_noargs(
objc_getClass("hello"),
alloc)
notesel = selN
}
const (
NSBorderlessWindowMask = 0
NSTitledWindowMask = 1 << 0
NSClosableWindowMask = 1 << 1
NSMiniaturizableWindowMask = 1 << 2
NSResizableWindowMask = 1 << 3
NSTexturedBackgroundWindowMask = 1 << 8
)
const (
// NSBackingStoreRetained = 0 // "You should not use this mode."
// NSBackingStoreNonretained = 1 // "You should not use this mode."
NSBackingStoreBuffered = 2
)
const (
NSRoundedBezelStyle = 1
)
var alloc = sel_getUid("alloc")
func notify(source string) {
csource := C.CString(source)
defer C.free(unsafe.Pointer(csource))
// we need to make an NSAutoreleasePool, otherwise we get leak warnings on stderr
pool := C.objc_msgSend_noargs(
objc_getClass("NSAutoreleasePool"),
sel_getUid("new"))
src := C.objc_msgSend_str(
objc_getClass("NSString"),
sel_getUid("stringWithUTF8String:"),
csource)
C.objc_msgSend_sel_id_bool(
delegate,
sel_getUid("performSelectorOnMainThread:withObject:waitUntilDone:"),
notesel,
src,
C.BOOL(C.YES)) // wait so we can properly drain the autorelease pool; on other platforms we wind up waiting anyway (since the main thread can only handle one thing at a time) so
C.objc_msgSend_noargs(pool,
sel_getUid("release"))
}
func main() {
NSWindow := objc_getClass("NSWindow")
NSWindowinit :=
sel_getUid("initWithContentRect:styleMask:backing:defer:")
setDelegate := sel_getUid("setDelegate:")
makeKeyAndOrderFront := sel_getUid("makeKeyAndOrderFront:")
style := uintptr(NSTitledWindowMask | NSClosableWindowMask)
backing := uintptr(NSBackingStoreBuffered)
deferx := C.BOOL(C.YES)
window := C.objc_msgSend_noargs(NSWindow, alloc)
window = objc_msgSend_rect_uint_uint_bool(window, NSWindowinit,
100, 100, 320, 240,
style, backing, deferx)
C.objc_msgSend_id(window, makeKeyAndOrderFront, window)
C.objc_msgSend_id(window, setDelegate,
delegate)
windowView := C.objc_msgSend_noargs(window,
sel_getUid("contentView"))
NSButton := objc_getClass("NSButton")
button := C.objc_msgSend_noargs(NSButton, alloc)
button = objc_msgSend_rect(button,
sel_getUid("initWithFrame:"),
20, 20, 200, 200)
C.objc_msgSend_id(button,
sel_getUid("setTarget:"),
delegate)
C.objc_msgSend_sel(button,
sel_getUid("setAction:"),
sel_getUid("buttonClicked:"))
objc_msgSend_uint(button,
sel_getUid("setBezelStyle:"),
NSRoundedBezelStyle)
C.objc_msgSend_id(windowView,
sel_getUid("addSubview:"),
button)
go func() {
for {
<-time.After(5 * time.Second)
fmt.Println("five seconds passed; sending notification...")
notify("timer")
}
}()
C.objc_msgSend_noargs(NSApp,
sel_getUid("run"))
}
func helloworld() {
_hello := C.CString("hello, world\n")
defer C.free(unsafe.Pointer(_hello))
NSString := objc_getClass("NSString")
stringWithUTF8String :=
sel_getUid("stringWithUTF8String:")
str := C.objc_msgSend_str(NSString,
stringWithUTF8String,
_hello)
UTF8String := sel_getUid("UTF8String")
res := C.objc_msgSend_noargs(str,
UTF8String)
cres := (*C.char)(unsafe.Pointer(res))
fmt.Printf("%s", C.GoString(cres))
}
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