// NewNotifyIcon creates and returns a new NotifyIcon.
//
// The NotifyIcon is initially not visible.
func NewNotifyIcon() (*NotifyIcon, error) {
// Create the message-only window for the NotifyIcon.
hWnd := win.CreateWindowEx(
0,
syscall.StringToUTF16Ptr(notifyIconWindowClass),
nil,
0,
0,
0,
0,
0,
win.HWND_MESSAGE,
0,
0,
nil)
if hWnd == 0 {
return nil, lastError("CreateWindowEx")
}
// Add our notify icon to the status area and make sure it is hidden.
nid := win.NOTIFYICONDATA{
HWnd: hWnd,
UFlags: win.NIF_MESSAGE | win.NIF_STATE,
DwState: win.NIS_HIDDEN,
DwStateMask: win.NIS_HIDDEN,
UCallbackMessage: notifyIconMessageId,
}
nid.CbSize = uint32(unsafe.Sizeof(nid))
if !win.Shell_NotifyIcon(win.NIM_ADD, &nid) {
return nil, newError("Shell_NotifyIcon")
}
// We want XP-compatible message behavior.
nid.UVersion = win.NOTIFYICON_VERSION
if !win.Shell_NotifyIcon(win.NIM_SETVERSION, &nid) {
return nil, newError("Shell_NotifyIcon")
}
// Create and initialize the NotifyIcon already.
menu, err := NewMenu()
if err != nil {
return nil, err
}
ni := &NotifyIcon{
id: nid.UID,
hWnd: hWnd,
contextMenu: menu,
}
// Set our *NotifyIcon as user data for the message window.
win.SetWindowLongPtr(hWnd, win.GWLP_USERDATA, uintptr(unsafe.Pointer(ni)))
return ni, nil
}
func (ni *NotifyIcon) showMessage(title, info string, iconType uint32) error {
nid := ni.notifyIconData()
nid.UFlags = win.NIF_INFO
nid.DwInfoFlags = iconType
copy(nid.SzInfoTitle[:], syscall.StringToUTF16(title))
copy(nid.SzInfo[:], syscall.StringToUTF16(info))
if !win.Shell_NotifyIcon(win.NIM_MODIFY, nid) {
return newError("Shell_NotifyIcon")
}
return nil
}
// SetToolTip sets the tool tip text of the NotifyIcon.
func (ni *NotifyIcon) SetToolTip(toolTip string) error {
if toolTip == ni.toolTip {
return nil
}
nid := ni.notifyIconData()
nid.UFlags = win.NIF_TIP
copy(nid.SzTip[:], syscall.StringToUTF16(toolTip))
if !win.Shell_NotifyIcon(win.NIM_MODIFY, nid) {
return newError("Shell_NotifyIcon")
}
ni.toolTip = toolTip
return nil
}
// Dispose releases the operating system resources associated with the
// NotifyIcon.
//
// The associated Icon is not disposed of.
func (ni *NotifyIcon) Dispose() error {
if ni.hWnd == 0 {
return nil
}
nid := ni.notifyIconData()
if !win.Shell_NotifyIcon(win.NIM_DELETE, nid) {
return newError("Shell_NotifyIcon")
}
if !win.DestroyWindow(ni.hWnd) {
return lastError("DestroyWindow")
}
ni.hWnd = 0
return nil
}
// SetVisible sets if the NotifyIcon is visible.
func (ni *NotifyIcon) SetVisible(visible bool) error {
if visible == ni.visible {
return nil
}
nid := ni.notifyIconData()
nid.UFlags = win.NIF_STATE
nid.DwStateMask = win.NIS_HIDDEN
if !visible {
nid.DwState = win.NIS_HIDDEN
}
if !win.Shell_NotifyIcon(win.NIM_MODIFY, nid) {
return newError("Shell_NotifyIcon")
}
ni.visible = visible
return nil
}
// SetIcon sets the Icon of the NotifyIcon.
func (ni *NotifyIcon) SetIcon(icon *Icon) error {
if icon == ni.icon {
return nil
}
nid := ni.notifyIconData()
nid.UFlags = win.NIF_ICON
if icon == nil {
nid.HIcon = 0
} else {
nid.HIcon = icon.hIcon
}
if !win.Shell_NotifyIcon(win.NIM_MODIFY, nid) {
return newError("Shell_NotifyIcon")
}
ni.icon = icon
return nil
}