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
}
func NewWebView(parent Container) (*WebView, error) {
if hr := win.OleInitialize(); hr != win.S_OK && hr != win.S_FALSE {
return nil, newError(fmt.Sprint("OleInitialize Error: ", hr))
}
wv := &WebView{
clientSite: webViewIOleClientSite{
IOleClientSite: win.IOleClientSite{
LpVtbl: webViewIOleClientSiteVtbl,
},
inPlaceSite: webViewIOleInPlaceSite{
IOleInPlaceSite: win.IOleInPlaceSite{
LpVtbl: webViewIOleInPlaceSiteVtbl,
},
inPlaceFrame: webViewIOleInPlaceFrame{
IOleInPlaceFrame: win.IOleInPlaceFrame{
LpVtbl: webViewIOleInPlaceFrameVtbl,
},
},
},
docHostUIHandler: webViewIDocHostUIHandler{
IDocHostUIHandler: win.IDocHostUIHandler{
LpVtbl: webViewIDocHostUIHandlerVtbl,
},
},
webBrowserEvents2: webViewDWebBrowserEvents2{
DWebBrowserEvents2: win.DWebBrowserEvents2{
LpVtbl: webViewDWebBrowserEvents2Vtbl,
},
},
},
}
if err := InitWidget(
wv,
parent,
webViewWindowClass,
win.WS_CLIPCHILDREN|win.WS_VISIBLE,
0); err != nil {
return nil, err
}
wv.clientSite.inPlaceSite.inPlaceFrame.webView = wv
succeeded := false
defer func() {
if !succeeded {
wv.Dispose()
}
}()
var classFactoryPtr unsafe.Pointer
if hr := win.CoGetClassObject(&win.CLSID_WebBrowser, win.CLSCTX_INPROC_HANDLER|win.CLSCTX_INPROC_SERVER, nil, &win.IID_IClassFactory, &classFactoryPtr); win.FAILED(hr) {
return nil, errorFromHRESULT("CoGetClassObject", hr)
}
classFactory := (*win.IClassFactory)(classFactoryPtr)
defer classFactory.Release()
var browserObjectPtr unsafe.Pointer
if hr := classFactory.CreateInstance(nil, &win.IID_IOleObject, &browserObjectPtr); win.FAILED(hr) {
return nil, errorFromHRESULT("IClassFactory.CreateInstance", hr)
}
browserObject := (*win.IOleObject)(browserObjectPtr)
wv.browserObject = browserObject
if hr := browserObject.SetClientSite((*win.IOleClientSite)(unsafe.Pointer(&wv.clientSite))); win.FAILED(hr) {
return nil, errorFromHRESULT("IOleObject.SetClientSite", hr)
}
if hr := browserObject.SetHostNames(syscall.StringToUTF16Ptr("Walk.WebView"), nil); win.FAILED(hr) {
return nil, errorFromHRESULT("IOleObject.SetHostNames", hr)
}
if hr := win.OleSetContainedObject((*win.IUnknown)(unsafe.Pointer(browserObject)), true); win.FAILED(hr) {
return nil, errorFromHRESULT("OleSetContainedObject", hr)
}
var rect win.RECT
win.GetClientRect(wv.hWnd, &rect)
if hr := browserObject.DoVerb(win.OLEIVERB_SHOW, nil, (*win.IOleClientSite)(unsafe.Pointer(&wv.clientSite)), -1, wv.hWnd, &rect); win.FAILED(hr) {
return nil, errorFromHRESULT("IOleObject.DoVerb", hr)
}
var cpcPtr unsafe.Pointer
if hr := browserObject.QueryInterface(&win.IID_IConnectionPointContainer, &cpcPtr); win.FAILED(hr) {
return nil, errorFromHRESULT("IOleObject.QueryInterface(IID_IConnectionPointContainer)", hr)
}
cpc := (*win.IConnectionPointContainer)(cpcPtr)
defer cpc.Release()
var cp *win.IConnectionPoint
if hr := cpc.FindConnectionPoint(&win.DIID_DWebBrowserEvents2, &cp); win.FAILED(hr) {
return nil, errorFromHRESULT("IConnectionPointContainer.FindConnectionPoint(DIID_DWebBrowserEvents2)", hr)
}
defer cp.Release()
var cookie uint32
if hr := cp.Advise(unsafe.Pointer(&wv.clientSite.webBrowserEvents2), &cookie); win.FAILED(hr) {
return nil, errorFromHRESULT("IConnectionPoint.Advise", hr)
}
wv.onResize()
wv.MustRegisterProperty("URL", NewProperty(
func() interface{} {
url, _ := wv.URL()
return url
},
func(v interface{}) error {
return wv.SetURL(v.(string))
},
wv.urlChangedPublisher.Event()))
succeeded = true
return wv, nil
}