101 lines
2.9 KiB
Go
101 lines
2.9 KiB
Go
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// 27 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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/*
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This creates a class goAppDelegate that will be used as the delegate for /everything/. Specifically, it:
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- runs uitask requests (uitask:)
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- handles window close events (windowShouldClose:)
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- handles window resize events (xxxx:)
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- handles button click events (buttonClick:)
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*/
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// #cgo LDFLAGS: -lobjc -framework Foundation -framework AppKit
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// #include <stdlib.h>
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// #include "objc_darwin.h"
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// extern void appDelegate_uitask(id, SEL, id); /* from uitask_darwin.go */
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// extern BOOL appDelegate_windowShouldClose(id, SEL, id);
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// /* because cgo doesn't like Nil */
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// static Class NilClass = Nil;
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import "C"
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var (
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appDelegate C.id
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)
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const (
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_goAppDelegate = "goAppDelegate"
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)
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var (
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_uitask = sel_getUid("uitask:")
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_windowShouldClose = sel_getUid("windowShouldClose:")
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)
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func mkAppDelegate() error {
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var appdelegateclass C.Class
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appdelegateclass, err = makeDelegateClass(_goAppDelegate)
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if err != nil {
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return fmt.Errorf("error creating NSApplication delegate: %v", err)
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}
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err = addDelegateMethod(appdelegateclass, _uitask,
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C.appDelegate_uitask, delegate_void)
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if err != nil {
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return fmt.Errorf("error adding NSApplication delegate uitask: method (to do UI tasks): %v", err)
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}
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err = addDelegateMethod(appdelegateclass, _windowShouldClose,
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C.appDelegate_windowShouldClose, delegate_bool)
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if err != nil {
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return fmt.Errorf("error adding NSApplication delegate windowShouldClose: method (to handle window close button events): %v", err)
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}
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// TODO using objc_new() causes a segfault; find out why
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// TODO make alloc followed by init (I thought NSObject provided its own init?)
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appDelegate = objc_alloc(objc_getClass(_goAppDelegate))
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return nil
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}
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//export appDelegate_windowShouldClose
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func appDelegate_windowShouldClose(self C.id, sel C.SEL, win C.id) C.BOOL {
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sysData := getSysData(win)
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sysData.signal()
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return C.BOOL(C.NO) // don't close
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}
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// this actually constructs the delegate class
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var (
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_NSObject_Class = C.object_getClass(_NSObject)
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)
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func makeDelegateClass(name string) (C.Class, error) {
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cname := C.CString(name)
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defer C.free(unsafe.Pointer(cname))
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c := C.objc_allocateClassPair(_NSObject_Class, cname, 0)
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if c == C.NilClass {
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return C.NilClass, fmt.Errorf("unable to create Objective-C class %s; reason unknown", name)
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}
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C.objc_registerClassPair(c)
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return c, nil
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}
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var (
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delegate_void = []C.char{'v', '@', ':', '@', 0} // void (*)(id, SEL, id)
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delegate_bool = []C.char{'#', '@', ':', '@', 0} // BOOL (*)(id, SEL, id)
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)
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// according to errors spit out by cgo, C function pointers are unsafe.Pointer
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func addDelegateMethod(class C.Class, sel C.SEL, imp unsafe.Pointer, ty []C.char) error {
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ok := C.class_addMethod(class, sel, C.IMP(imp), &ty[0])
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if ok == C.BOOL(C.NO) {
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// TODO get function name
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return fmt.Errorf("unable to add selector %v/imp %v (reason unknown)", sel, imp)
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}
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return nil
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}
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