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// 27 february 2014
package ui
import (
"fmt"
"unsafe"
)
/*
This creates a class goAppDelegate that will be used as the delegate for /everything/. Specifically, it:
- runs uitask requests (uitask:)
- handles window close events (windowShouldClose:)
- handles window resize events (windowDidResize: (TODO also windowDidEndLiveResize:?))
- handles button click events (buttonClicked:)
*/
// #cgo LDFLAGS: -lobjc -framework Foundation -framework AppKit
// #include <stdlib.h>
// #include "objc_darwin.h"
// extern void appDelegate_uitask(id, SEL, id); /* from uitask_darwin.go */
// extern BOOL appDelegate_windowShouldClose(id, SEL, id);
// extern void appDelegate_windowDidResize(id, SEL, id);
// extern void appDelegate_buttonClicked(id, SEL, id);
import "C"
var (
appDelegate C.id
)
const (
_goAppDelegate = "goAppDelegate"
)
var (
_uitask = sel_getUid("uitask:")
_windowShouldClose = sel_getUid("windowShouldClose:")
_windowDidResize = sel_getUid("windowDidResize:")
_buttonClicked = sel_getUid("buttonClicked:")
)
func mkAppDelegate() error {
appdelegateclass, err := makeDelegateClass(_goAppDelegate)
if err != nil {
return fmt.Errorf("error creating NSApplication delegate: %v", err)
}
err = addDelegateMethod(appdelegateclass, _uitask,
C.appDelegate_uitask, delegate_void)
if err != nil {
return fmt.Errorf("error adding NSApplication delegate uitask: method (to do UI tasks): %v", err)
}
err = addDelegateMethod(appdelegateclass, _windowShouldClose,
C.appDelegate_windowShouldClose, delegate_bool)
if err != nil {
return fmt.Errorf("error adding NSApplication delegate windowShouldClose: method (to handle window close button events): %v", err)
}
err = addDelegateMethod(appdelegateclass, _windowDidResize,
C.appDelegate_windowDidResize, delegate_void)
if err != nil {
return fmt.Errorf("error adding NSApplication delegate windowDidResize: method (to handle window resize events): %v", err)
}
err = addDelegateMethod(appdelegateclass, _buttonClicked,
C.appDelegate_buttonClicked, delegate_void)
if err != nil {
return fmt.Errorf("error adding NSApplication delegate buttonClicked: method (to handle button clicks): %v", err)
}
// 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 nil
}
//export appDelegate_windowShouldClose
func appDelegate_windowShouldClose(self C.id, sel C.SEL, win C.id) C.BOOL {
sysData := getSysData(win)
sysData.signal()
return C.BOOL(C.NO) // don't close
}
var (
_object = sel_getUid("object")
_display = sel_getUid("display")
)
//export appDelegate_windowDidResize
func appDelegate_windowDidResize(self C.id, sel C.SEL, notification C.id) {
win := C.objc_msgSend_noargs(notification, _object)
sysData := getSysData(win)
r := C.objc_msgSend_stret_rect_noargs(win, _frame)
if sysData.resize != nil {
err := sysData.resize(int(r.x), int(r.y), int(r.width), int(r.height))
if err != nil {
panic("child resize failed: " + err.Error())
}
}
C.objc_msgSend_noargs(win, _display) // redraw everything; TODO only if resize() was called?
}
//export appDelegate_buttonClicked
func appDelegate_buttonClicked(self C.id, sel C.SEL, button C.id) {
sysData := getSysData(button)
sysData.signal()
}
// this actually constructs the delegate class
var (
_NSObject_Class = C.object_getClass(_NSObject)
)
func makeDelegateClass(name string) (C.Class, error) {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
c := C.objc_allocateClassPair(_NSObject_Class, cname, 0)
if c == C.NilClass {
return C.NilClass, fmt.Errorf("unable to create Objective-C class %s; reason unknown", name)
}
C.objc_registerClassPair(c)
return c, nil
}
var (
delegate_void = []C.char{'v', '@', ':', '@', 0} // void (*)(id, SEL, id)
delegate_bool = []C.char{'c', '@', ':', '@', 0} // BOOL (*)(id, SEL, id)
)
// according to errors spit out by cgo, C function pointers are unsafe.Pointer
func addDelegateMethod(class C.Class, sel C.SEL, imp unsafe.Pointer, ty []C.char) error {
ok := C.class_addMethod(class, sel, C.IMP(imp), &ty[0])
if ok == C.BOOL(C.NO) {
// TODO get function name
return fmt.Errorf("unable to add selector %v/imp %v (reason unknown)", sel, imp)
}
return nil
}
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