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// 28 february 2014
package ui
import (
"fmt"
"unsafe"
)
// #cgo LDFLAGS: -lobjc -framework Foundation
// #include <stdlib.h>
// #include "objc_darwin.h"
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)
}
// Common Objective-C types and selectors.
var (
_NSObject = objc_getClass("NSObject")
_NSString = objc_getClass("NSString")
_alloc = sel_getUid("alloc")
_new = sel_getUid("new")
_release = sel_getUid("release")
_stringWithUTF8String = sel_getUid("stringWithUTF8String:")
_UTF8String = sel_getUid("UTF8String")
)
func toNSString(str string) C.id {
cstr := C.CString(str)
defer C.free(unsafe.Pointer(cstr))
return C.objc_msgSend_str(_NSString,
_stringWithUTF8String,
cstr)
}
func fromNSString(str C.id) string {
cstr := C.objc_msgSend_noargs(str, _UTF8String)
return C.GoString((*C.char)(unsafe.Pointer(cstr)))
}
// These create new classes.
// selector contains the information for a new selector.
type selector struct {
name string
imp uintptr // not unsafe.Pointer because https://code.google.com/p/go/issues/detail?id=7665
itype itype
desc string // for error reporting
}
type itype uint
const (
sel_void_id itype = iota
sel_bool_id
nitypes
)
var itypes = [nitypes][]C.char{
sel_void_id: []C.char{'v', '@', ':', '@', 0},
sel_bool_id: []C.char{'c', '@', ':', '@', 0},
}
func makeClass(name string, super C.id, sels []selector, desc string) (err error) {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
// an id that describes a class is itself a Class
// thanks to Psy| in irc.freenode.net/##objc
c := C.objc_allocateClassPair(C.Class(unsafe.Pointer(super)), cname, 0)
if c == C.NilClass {
return fmt.Errorf("unable to create Objective-C class %s for %s; reason unknown", name, desc)
}
C.objc_registerClassPair(c)
for _, v := range sels {
ok := C.class_addMethod(c, sel_getUid(v.name),
C.IMP(unsafe.Pointer(v.imp)), &itypes[v.itype][0])
if ok == C.BOOL(C.NO) {
return fmt.Errorf("unable to add selector %s to class %s (needed for %s; reason unknown)", v.name, name, v.desc)
}
}
return nil
}
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