116 lines
3.4 KiB
Go
116 lines
3.4 KiB
Go
// 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_applicationDidFinishLaunching(id, SEL, id);
|
|
// extern void appDelegate_uitask(id, SEL, id);
|
|
import "C"
|
|
|
|
var uitask chan func()
|
|
|
|
var mtret chan interface{}
|
|
|
|
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")
|
|
)
|
|
|
|
func ui(initDone chan error) {
|
|
runtime.LockOSThread()
|
|
|
|
uitask = make(chan func())
|
|
mtret = make(chan interface{})
|
|
go mainThread()
|
|
v := <-mtret
|
|
if err, ok := v.(error); err {
|
|
initDone <- fmt.Errorf("error initializing Cocoa: %v", err)
|
|
return
|
|
}
|
|
appDelegate := v.(C.id)
|
|
|
|
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)
|
|
}
|
|
}
|
|
|
|
const (
|
|
_goAppDelegate = "goAppDelegate"
|
|
)
|
|
|
|
var (
|
|
_NSApplication = objc_getClass("NSApplication")
|
|
|
|
_sharedApplication = sel_getUid("sharedApplication")
|
|
_applicationDidFinishLaunching = sel_getUid("applicationDidFinishLaunching:")
|
|
_run = sel_getUid("run")
|
|
)
|
|
|
|
func mainThread() {
|
|
runtime.LockOSThread()
|
|
|
|
_NSApp := C.objc_msgSend_noargs(_NSApplication, _sharedApplication)
|
|
appdelegateclass, err := makeDelegateClass(_goAppDelegate)
|
|
if err != nil {
|
|
mtret <- fmt.Errorf("error creating NSApplication delegate: %v", err)
|
|
return
|
|
}
|
|
err = addDelegateMethod(appdelegateclass, _applicationDidFinishLaunching,
|
|
C.appDelegate_applicationDidFinishLaunching)
|
|
if err != nil {
|
|
mtret <- fmt.Errorf("error adding NSApplication delegate applicationDidFinishLaunching: method (to start UI loop): %v", err)
|
|
return
|
|
}
|
|
err = addDelegateMethod(appdelegateclass, _uitask, C.appDelegate_uitask)
|
|
if err != nil {
|
|
mtret <- fmt.Errorf("error adding NSApplication delegate uitask: method (to do UI tasks): %v", err)
|
|
return
|
|
}
|
|
appDelegate := objc_new(objc_getClass(_goAppDelegate))
|
|
objc_setDelegate(_NSApp, appDelegate)
|
|
// and that's it, really
|
|
C.objc_msgSend_noargs(_NSApp, _run)
|
|
}
|
|
|
|
//export appDelegate_applicationDidFinishLaunching
|
|
func appDelegate_applicationDidFinishLaunching(self C.id, sel C.SEL, arg C.id) {
|
|
mtret <- self
|
|
}
|
|
|
|
//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)()
|
|
}
|