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