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cocoa.go
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cocoa.go
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package gallium
/*
#include <stdlib.h>
#include "gallium/gallium.h"
#include "gallium/menu.h"
// It does not seem that we can import "_cgo_export.h" from here
extern void cgo_onMenuClicked(void*);
// This is a wrapper around NSMenu_AddMenuItem that adds the function pointer
// argument, since this does not seem to be possible from Go directly.
static inline gallium_nsmenuitem_t* helper_NSMenu_AddMenuItem(
gallium_nsmenu_t* menu,
const char* title,
const char* shortcutKey,
gallium_modifier_t shortcutModifier,
void *callbackArg) {
return NSMenu_AddMenuItem(
menu,
title,
shortcutKey,
shortcutModifier,
&cgo_onMenuClicked,
callbackArg);
}
*/
import "C"
import (
"errors"
"fmt"
"log"
"strings"
)
type MenuEntry interface {
menu()
}
type MenuItem struct {
Title string
Shortcut string
OnClick func()
}
func (MenuItem) menu() {}
type Menu struct {
Title string
Entries []MenuEntry
}
func (Menu) menu() {}
var menuMgr *menuManager
type menuManager struct {
items map[int]MenuItem
}
func newMenuManager() *menuManager {
return &menuManager{make(map[int]MenuItem)}
}
func (m *menuManager) add(menu MenuEntry, parent *C.gallium_nsmenu_t) {
switch menu := menu.(type) {
case Menu:
item := C.NSMenu_AddMenuItem(parent, C.CString(menu.Title), nil, 0, nil, nil)
submenu := C.NSMenu_New(C.CString(menu.Title))
C.NSMenuItem_SetSubmenu(item, submenu)
for _, entry := range menu.Entries {
m.add(entry, submenu)
}
case MenuItem:
id := len(m.items)
m.items[id] = menu
callbackArg := C.malloc(C.sizeof_int)
*(*C.int)(callbackArg) = C.int(id)
key, modifiers, _ := parseShortcut(menu.Shortcut)
C.helper_NSMenu_AddMenuItem(
parent,
C.CString(menu.Title),
C.CString(key),
C.gallium_modifier_t(modifiers),
callbackArg)
default:
log.Printf("unexpected menu entry: %T", menu)
}
}
func parseShortcut(s string) (key string, modifiers int, err error) {
parts := strings.Split(s, "+")
if len(parts) == 0 {
return "", 0, fmt.Errorf("empty shortcut")
}
key = parts[len(parts)-1]
if len(key) == 0 {
return "", 0, fmt.Errorf("empty key")
}
for _, part := range parts[:len(parts)-1] {
switch strings.ToLower(part) {
case "cmd":
modifiers |= int(C.GalliumCmdModifier)
case "ctrl":
modifiers |= int(C.GalliumCmdModifier)
case "cmdctrl":
modifiers |= int(C.GalliumCmdOrCtrlModifier)
case "alt":
modifiers |= int(C.GalliumAltOrOptionModifier)
case "option":
modifiers |= int(C.GalliumAltOrOptionModifier)
case "fn":
modifiers |= int(C.GalliumFunctionModifier)
case "shift":
modifiers |= int(C.GalliumShiftModifier)
default:
return "", 0, fmt.Errorf("unknown modifier: %s", part)
}
}
return
}
func (app *App) SetMenu(menus []Menu) {
if menuMgr == nil {
menuMgr = newMenuManager()
}
root := C.NSMenu_New(C.CString("<root>"))
for _, m := range menus {
menuMgr.add(m, root)
}
C.NSApplication_SetMainMenu(root)
}
func (app *App) AddStatusItem(width int, title string, highlight bool, entries ...MenuEntry) {
if menuMgr == nil {
menuMgr = newMenuManager()
}
root := C.NSMenu_New(C.CString("<statusbar>"))
for _, m := range entries {
menuMgr.add(m, root)
}
C.NSStatusBar_AddItem(C.int(width), C.CString(title), C.bool(highlight), root)
}
// Image holds a handle to a platform-specific image structure. On OSX it is NSImage.
type Image struct {
c *C.gallium_nsimage_t
}
var (
ErrImageDecodeFailed = errors.New("image could not be decoded")
)
// ImageFromPNG creates an image from a buffer containing a PNG-encoded image.
func ImageFromPNG(buf []byte) (*Image, error) {
cbuf := C.CBytes(buf)
defer C.free(cbuf)
cimg := C.NSImage_NewFromPNG(cbuf, C.int(len(buf)))
if cimg == nil {
return nil, ErrImageDecodeFailed
}
return &Image{cimg}, nil
}
// ImageToPNG writes an image to the given file
func ImageToPNG(image *Image, path string) {
C.NSImage_WriteToFile(image.c, C.CString(path))
}
type Notification struct {
Title string
Subtitle string
InformativeText string
Image *Image
Identifier string
ActionButtonTitle string
OtherButtonTitle string
}
func (app *App) Post(n Notification) {
var cimg *C.gallium_nsimage_t
if n.Image != nil {
cimg = n.Image.c
}
cn := C.NSUserNotification_New(
C.CString(n.Title),
C.CString(n.Subtitle),
C.CString(n.InformativeText),
cimg,
C.CString(n.Identifier),
len(n.ActionButtonTitle) > 0,
len(n.OtherButtonTitle) > 0,
C.CString(n.ActionButtonTitle),
C.CString(n.OtherButtonTitle))
C.NSUserNotificationCenter_DeliverNotification(cn)
}
func RunApplication() {
log.Println("in RunApplication")
C.NSApplication_Run()
}