private ShellNativeMethods.FileOpenOptions CalculateNativeDialogOptionFlags()
{
// We start with only a few flags set by default,
// then go from there based on the current state
// of the managed dialog's property values.
ShellNativeMethods.FileOpenOptions flags = ShellNativeMethods.FileOpenOptions.NoTestFileCreate;
// Call to derived (concrete) dialog to
// set dialog-specific flags.
flags = GetDerivedOptionFlags(flags);
// Apply other optional flags.
if (ensureFileExists)
{
flags |= ShellNativeMethods.FileOpenOptions.FileMustExist;
}
if (ensurePathExists)
{
flags |= ShellNativeMethods.FileOpenOptions.PathMustExist;
}
if (!ensureValidNames)
{
flags |= ShellNativeMethods.FileOpenOptions.NoValidate;
}
if (!EnsureReadOnly)
{
flags |= ShellNativeMethods.FileOpenOptions.NoReadOnlyReturn;
}
if (restoreDirectory)
{
flags |= ShellNativeMethods.FileOpenOptions.NoChangeDirectory;
}
if (!showPlacesList)
{
flags |= ShellNativeMethods.FileOpenOptions.HidePinnedPlaces;
}
if (!addToMruList)
{
flags |= ShellNativeMethods.FileOpenOptions.DontAddToRecent;
}
if (showHiddenItems)
{
flags |= ShellNativeMethods.FileOpenOptions.ForceShowHidden;
}
if (!navigateToShortcut)
{
flags |= ShellNativeMethods.FileOpenOptions.NoDereferenceLinks;
}
return(flags);
}
internal override ShellNativeMethods.FileOpenOptions GetDerivedOptionFlags(ShellNativeMethods.FileOpenOptions flags)
{
if (overwritePrompt)
{
flags |= ShellNativeMethods.FileOpenOptions.OverwritePrompt;
}
if (createPrompt)
{
flags |= ShellNativeMethods.FileOpenOptions.CreatePrompt;
}
if (!isExpandedMode)
{
flags |= ShellNativeMethods.FileOpenOptions.DefaultNoMiniMode;
}
if (alwaysAppendDefaultExtension)
{
flags |= ShellNativeMethods.FileOpenOptions.StrictFileTypes;
}
return(flags);
}
internal override ShellNativeMethods.FileOpenOptions GetDerivedOptionFlags(ShellNativeMethods.FileOpenOptions flags)
{
if (multiselect)
{
flags |= ShellNativeMethods.FileOpenOptions.AllowMultiSelect;
}
if (isFolderPicker)
{
flags |= ShellNativeMethods.FileOpenOptions.PickFolders;
}
if (!allowNonFileSystem)
{
flags |= ShellNativeMethods.FileOpenOptions.ForceFilesystem;
}
else if (allowNonFileSystem)
{
flags |= ShellNativeMethods.FileOpenOptions.AllNonStorageItems;
}
return(flags);
}
internal abstract ShellNativeMethods.FileOpenOptions GetDerivedOptionFlags(ShellNativeMethods.FileOpenOptions flags);
