func (wv *WebView) Dispose() {
if wv.browserObject != nil {
wv.browserObject.Close(win.OLECLOSE_NOSAVE)
wv.browserObject.Release()
wv.browserObject = nil
win.OleUninitialize()
}
wv.WidgetBase.Dispose()
}
func (dlg *FileDialog) ShowBrowseFolder(owner Form) (accepted bool, err error) {
// Calling OleInitialize (or similar) is required for BIF_NEWDIALOGSTYLE.
if hr := win.OleInitialize(); hr != win.S_OK && hr != win.S_FALSE {
return false, newError(fmt.Sprint("OleInitialize Error: ", hr))
}
defer win.OleUninitialize()
pathFromPIDL := func(pidl uintptr) (string, error) {
var path [win.MAX_PATH]uint16
if !win.SHGetPathFromIDList(pidl, &path[0]) {
return "", newError("SHGetPathFromIDList failed")
}
return syscall.UTF16ToString(path[:]), nil
}
// We use this callback to disable the OK button in case of "invalid"
// selections.
callback := func(hwnd win.HWND, msg uint32, lp, wp uintptr) uintptr {
const BFFM_SELCHANGED = 2
if msg == BFFM_SELCHANGED {
_, err := pathFromPIDL(lp)
var enabled uintptr
if err == nil {
enabled = 1
}
const BFFM_ENABLEOK = win.WM_USER + 101
win.SendMessage(hwnd, BFFM_ENABLEOK, 0, enabled)
}
return 0
}
var ownerHwnd win.HWND
if owner != nil {
ownerHwnd = owner.Handle()
}
// We need to put the initial path into a buffer of at least MAX_LENGTH
// length, or we may get random crashes.
var buf [win.MAX_PATH]uint16
copy(buf[:], syscall.StringToUTF16(dlg.InitialDirPath))
const BIF_NEWDIALOGSTYLE = 0x00000040
bi := win.BROWSEINFO{
HwndOwner: ownerHwnd,
PszDisplayName: &buf[0],
LpszTitle: syscall.StringToUTF16Ptr(dlg.Title),
UlFlags: BIF_NEWDIALOGSTYLE,
Lpfn: syscall.NewCallback(callback),
}
pidl := win.SHBrowseForFolder(&bi)
if pidl == 0 {
return false, nil
}
defer win.CoTaskMemFree(pidl)
dlg.FilePath, err = pathFromPIDL(pidl)
accepted = dlg.FilePath != ""
return
}