private SafeNativeMethods.FOS 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.
SafeNativeMethods.FOS flags =
SafeNativeMethods.FOS.FOS_NOTESTFILECREATE
| SafeNativeMethods.FOS.FOS_FORCEFILESYSTEM;
// Call to derived (concrete) dialog to
// set dialog-specific flags.
flags = GetDerivedOptionFlags(flags);
#if WIN7
if (!forceFileSystem)
{
flags &= ~SafeNativeMethods.FOS.FOS_FORCEFILESYSTEM;
}
#endif
// Apply other optional flags.
if (checkFileExists)
{
flags |= SafeNativeMethods.FOS.FOS_FILEMUSTEXIST;
}
if (checkPathExists)
{
flags |= SafeNativeMethods.FOS.FOS_PATHMUSTEXIST;
}
if (!checkValidNames)
{
flags |= SafeNativeMethods.FOS.FOS_NOVALIDATE;
}
if (!CheckReadOnly)
{
flags |= SafeNativeMethods.FOS.FOS_NOREADONLYRETURN;
}
if (restoreDirectory)
{
flags |= SafeNativeMethods.FOS.FOS_NOCHANGEDIR;
}
if (!showPlacesList)
{
flags |= SafeNativeMethods.FOS.FOS_HIDEPINNEDPLACES;
}
if (!addToMruList)
{
flags |= SafeNativeMethods.FOS.FOS_DONTADDTORECENT;
}
if (showHiddenItems)
{
flags |= SafeNativeMethods.FOS.FOS_FORCESHOWHIDDEN;
}
if (!dereferenceLinks)
{
flags |= SafeNativeMethods.FOS.FOS_NODEREFERENCELINKS;
}
return(flags);
}
internal override SafeNativeMethods.FOS GetDerivedOptionFlags(SafeNativeMethods.FOS flags)
{
if (multiselect)
{
flags |= SafeNativeMethods.FOS.FOS_ALLOWMULTISELECT;
}
if (foldersOnly)
{
flags |= SafeNativeMethods.FOS.FOS_PICKFOLDERS;
}
return(flags);
}
internal override SafeNativeMethods.FOS GetDerivedOptionFlags(SafeNativeMethods.FOS flags)
{
if (overwritePrompt)
{
flags |= SafeNativeMethods.FOS.FOS_OVERWRITEPROMPT;
}
if (createPrompt)
{
flags |= SafeNativeMethods.FOS.FOS_CREATEPROMPT;
}
if (!enableMiniMode)
{
flags |= SafeNativeMethods.FOS.FOS_DEFAULTNOMINIMODE;
}
if (strictExtensions)
{
flags |= SafeNativeMethods.FOS.FOS_STRICTFILETYPES;
}
return(flags);
}
internal abstract SafeNativeMethods.FOS GetDerivedOptionFlags(SafeNativeMethods.FOS flags);
internal static bool IsOptionSet(IFileDialog dialog, SafeNativeMethods.FOS flag)
{
SafeNativeMethods.FOS currentFlags = GetCurrentOptionFlags(dialog);
return((currentFlags & flag) == flag);
}
