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// 28 february 2014
package ui
import (
"fmt"
"runtime"
"unsafe"
)
/*
We will create an Objective-C class goAppDelegate. It contains two methods:
- (void)applicationDidFinishLoading:(NSNotification *)unused
will signal to ui() that we are now in the Cocoa event loop; we make our goAppDelegate instance the NSApplication delegate
- (void)uitask:(NSValue *)functionPointer
the function that actually performs our UI task functions; it is called with NSObject's performSelectorOnMainThread system
*/
// #cgo LDFLAGS: -lobjc -framework Foundation -framework AppKit
// #include "objc_darwin.h"
// extern void appDelegate_uitask(id, SEL, id);
import "C"
// temporary for now
func msgBox(string, string){}
func msgBoxError(string, string){}
var uitask chan func()
var (
_NSAutoreleasePool = objc_getClass("NSAutoreleasePool")
_NSValue = objc_getClass("NSValue")
_uitask = sel_getUid("uitask:")
_valueWithPointer = sel_getUid("valueWithPointer:")
_performSelectorOnMainThread =
sel_getUid("performSelectorOnMainThread:withObject:waitUntilDone:")
_pointerValue = sel_getUid("pointerValue")
_run = sel_getUid("run")
)
func ui(main func()) error {
runtime.LockOSThread()
uitask = make(chan func())
NSApp, appDelegate, err := initCocoa()
if err != nil {
return err
}
// Cocoa must run on the first thread created by the program, so we run our dispatcher on another thread instead
go func() {
for f := range uitask {
// we need to make an NSAutoreleasePool, otherwise we get leak warnings on stderr
pool := objc_new(_NSAutoreleasePool)
fp := C.objc_msgSend_ptr(_NSValue, _valueWithPointer,
unsafe.Pointer(&f))
C.objc_msgSend_sel_id_bool(
appDelegate,
_performSelectorOnMainThread,
_uitask,
fp,
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
objc_release(pool)
}
}()
go main()
C.objc_msgSend_noargs(NSApp, _run)
return nil
}
// TODO move to init_darwin.go?
const (
_goAppDelegate = "goAppDelegate"
)
var (
_NSApplication = objc_getClass("NSApplication")
_sharedApplication = sel_getUid("sharedApplication")
)
func initCocoa() (NSApp C.id, appDelegate C.id, err error) {
var appdelegateclass C.Class
NSApp = C.objc_msgSend_noargs(_NSApplication, _sharedApplication)
err = addDelegateMethod(appdelegateclass, _uitask, C.appDelegate_uitask)
if err != nil {
err = fmt.Errorf("error adding NSApplication delegate uitask: method (to do UI tasks): %v", err)
return
}
// TODO using objc_new() causes a segfault; find out why
// TODO make alloc followed by init (I thought NSObject provided its own init?)
appDelegate = objc_alloc(objc_getClass(_goAppDelegate))
return
}
//export appDelegate_uitask
func appDelegate_uitask(self C.id, sel C.SEL, arg C.id) {
p := C.objc_msgSend_noargs(arg, _pointerValue)
f := (*func ())(unsafe.Pointer(p))
(*f)()
}
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