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package systray
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"syscall"
"unsafe"
"github.com/getlantern/filepersist"
)
var (
iconFiles = make([]*os.File, 0)
dllDir = filepath.Join(os.Getenv("APPDATA"), "systray")
dllFileName = "systray" + runtime.GOARCH + ".dll"
dllFile = filepath.Join(dllDir, dllFileName)
mod = syscall.NewLazyDLL(dllFile)
_nativeLoop = mod.NewProc("nativeLoop")
_quit = mod.NewProc("quit")
_setIcon = mod.NewProc("setIcon")
_setTitle = mod.NewProc("setTitle")
_setTooltip = mod.NewProc("setTooltip")
_add_or_update_menu_item = mod.NewProc("add_or_update_menu_item")
_add_separator = mod.NewProc("add_separator")
_hide_menu_item = mod.NewProc("hide_menu_item")
)
func init() {
// Write DLL to file
b, err := Asset(dllFileName)
if err != nil {
panic(fmt.Errorf("Unable to read "+dllFileName+": %v", err))
}
err = os.MkdirAll(dllDir, 0755)
if err != nil {
panic(fmt.Errorf("Unable to create directory %v to hold "+dllFileName+": %v", dllDir, err))
}
err = filepersist.Save(dllFile, b, 0644)
if err != nil {
panic(fmt.Errorf("Unable to save "+dllFileName+" to %v: %v", dllFile, err))
}
}
func nativeLoop() {
_nativeLoop.Call(
syscall.NewCallbackCDecl(systray_ready),
syscall.NewCallbackCDecl(systray_on_exit),
syscall.NewCallbackCDecl(systray_menu_item_selected))
}
func quit() {
_quit.Call()
for _, f := range iconFiles {
err := os.Remove(f.Name())
if err != nil {
log.Debugf("Unable to delete temporary icon file %v: %v", f.Name(), err)
}
}
}
// SetIcon sets the systray icon.
// iconBytes should be the content of .ico for windows and .ico/.jpg/.png
// for other platforms.
func SetIcon(iconBytes []byte) {
f, err := ioutil.TempFile("", "systray_temp_icon")
if err != nil {
log.Errorf("Unable to create temp icon: %v", err)
return
}
defer f.Close()
_, err = f.Write(iconBytes)
if err != nil {
log.Errorf("Unable to write icon to temp file %v: %v", f.Name(), f)
return
}
// Need to close file before we load it to make sure contents is flushed.
f.Close()
name, err := strUTF16(f.Name())
if err != nil {
log.Errorf("Unable to convert name to string pointer: %v", err)
return
}
_setIcon.Call(name.Raw())
}
// SetTitle sets the systray title, only available on Mac.
func SetTitle(title string) {
// do nothing
}
// SetTooltip sets the systray tooltip to display on mouse hover of the tray icon,
// only available on Mac and Windows.
func SetTooltip(tooltip string) {
t, err := strUTF16(tooltip)
if err != nil {
log.Errorf("Unable to convert tooltip to string pointer: %v", err)
return
}
_setTooltip.Call(t.Raw())
}
func addOrUpdateMenuItem(item *MenuItem) {
var disabled = 0
if item.disabled {
disabled = 1
}
var checked = 0
if item.checked {
checked = 1
}
title, err := strUTF16(item.title)
if err != nil {
log.Errorf("Unable to convert title to string pointer: %v", err)
return
}
tooltip, err := strUTF16(item.tooltip)
if err != nil {
log.Errorf("Unable to convert tooltip to string pointer: %v", err)
return
}
_add_or_update_menu_item.Call(
uintptr(item.id),
title.Raw(),
tooltip.Raw(),
uintptr(disabled),
uintptr(checked),
)
}
func addSeparator(id int32) {
_add_separator.Call(uintptr(id))
}
func hideMenuItem(item *MenuItem) {
_hide_menu_item.Call(uintptr(item.id))
}
func showMenuItem(item *MenuItem) {
addOrUpdateMenuItem(item)
}
type utf16 []uint16
// Raw returns the underlying *wchar_t of an utf16 so we can pass to DLL
func (u utf16) Raw() uintptr {
return uintptr(unsafe.Pointer(&u[0]))
}
// strUTF16 converts a Go string into a utf16 byte sequence
func strUTF16(s string) (utf16, error) {
return syscall.UTF16FromString(s)
}
// systray_ready takes an ignored parameter just so we can compile a callback
// (for some reason in Go 1.4.x, syscall.NewCallback panics if there's no
// parameter to the function).
func systray_ready(ignore uintptr) uintptr {
systrayReady()
return 0
}
func systray_on_exit(ignore uintptr) uintptr {
systrayExit()
return 0
}
func systray_menu_item_selected(id uintptr) uintptr {
systrayMenuItemSelected(int32(id))
return 0
}
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