/// <summary>
/// File picker implementation for WPF; uses the Win32 OpenFileDialog from
/// PresentationFoundation reference assembly.
/// </summary>
/// <param name="allowedTypes">
/// Specifies one or multiple allowed types. When null, all file types
/// can be selected while picking.
/// On WPF, specify strings like this: "Data type (*.ext)|*.ext", which
/// corresponds how the Windows file open dialog specifies file types.
/// </param>
/// <returns>file data of picked file, or null when picking was cancelled</returns>
public Task <FileData> PickFile(string[] allowedTypes = null, string defaultName = null, bool saving = false)
{
var picker = new Gtk.FileChooserDialog(
saving ? "Save As" : "Open",
null, saving ? FileChooserAction.Save : FileChooserAction.Open,
"Cancel", ResponseType.Cancel,
saving ? "Save As" : "Open", ResponseType.Accept
);
foreach (var type in allowedTypes)
{
var filter = new FileFilter();
filter.AddMimeType(type);
filter.Name = $"{type.Split('/')[0]} files (*.{type.Split('/')[1]})";
picker.AddFilter(filter);
}
picker.SetCurrentFolder(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments));
picker.CurrentName = defaultName;
var result = picker.Run();
if (result == (int)Gtk.ResponseType.Accept)
{
FileData data = new PlatformFileData(picker.Filename);
picker.Destroy();
return(Task.FromResult(data));
}
else
{
picker.Destroy();
return(Task.FromResult <FileData>(null));
}
}
public Task <FileData> PickFile(string[] allowedTypes, string defaultName, bool saving)
{
// for consistency with other platforms, only allow selecting of a single file.
// would be nice if we passed a "file options" to override picking multiple files & directories
var openPanel = new NSOpenPanel();
openPanel.CanChooseFiles = true;
openPanel.AllowsMultipleSelection = false;
openPanel.CanChooseDirectories = false;
// macOS allows the file types to contain UTIs, filename extensions or a combination of the two.
// If no types are specified, all files are selectable.
if (allowedTypes != null)
{
openPanel.AllowedFileTypes = allowedTypes;
}
FileData data = null;
var result = openPanel.RunModal();
if (result == 1)
{
// Nab the first file
var url = openPanel.Urls[0];
if (url != null)
{
var path = url.Path;
data = new PlatformFileData(path);
}
}
return(Task.FromResult(data));
}
