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Adding initial spec for Reunion Picker API. #99

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This is the high level specification for the File/Folder picker in Reunion. This initial draft includes the API of the proposed File/Folder picker.

@ghost ghost added the needs-triage label Jun 30, 2020
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mdtauk commented Jun 30, 2020

Is this intending to be a wrap for the existing picker experiences, or will this be a new File/Folder Picking UI and UX which could be built in Xaml, and used by all lifecycles of WinUI and Reunion apps? #Resolved

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ZenBird-zz commented Jun 30, 2020

Is this intending to be a wrap for the existing picker experiences, or will this be a new File/Folder Picking UI and UX which could be built in Xaml, and used by all lifecycles of WinUI and Reunion apps?

This API will reuse some code from the existing experience. This will for the most part be a rewrite and hence will benefit from being built in Xaml. #Resolved

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mdtauk commented Jun 30, 2020

Is this intending to be a wrap for the existing picker experiences, or will this be a new File/Folder Picking UI and UX which could be built in Xaml, and used by all lifecycles of WinUI and Reunion apps?

This API will reuse some code from the existing experience. This will for the most part be a rewrite and hence will benefit from being build in Xaml.

Great to hear! File Picking dialogs are some of the most commonly seen UI (like the UAC prompt), and having them be modern and reflect the modern Shell and Fluent design will go a long way to making the whole OS feel more consistent.

I would like to see most things that are currently possible with the Win32 dialogs carried over, (with the relevant permissions dialogs).

The removal of outdated or undesirable extensibility and features should be considered, as Reunion and WinUI 3 are both opt ins, and so there is an expectation of code changes for the most part - but keeping existing code working should be a goal as much as possible. #Resolved

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Some preliminary feedback.

Also, I just wanted to make sure that I can get a filesystem path out of the StorageItem (at least in a full-trust process) so I can use it with whatever API I need. The UWP storage subsystem is infamously slow and difficult to use (cf. #8). Thanks!

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wjk commented Jun 30, 2020

One other thought: I’m torn about the namespace Microsoft.Reunion.Storage.Pickers. I can think of three different responses to this:

  1. Keep the Microsoft.Reunion part and have all other namespaces in this repo start with that string. Clunky, but much more consistent.
  2. Change the namespace to Microsoft.Storage.Pickers, by analogy to Windows.Storage.Pickers.
  3. Change the namespace to Microsoft.FilePickers or Microsoft.StoragePickers.

My personal namespace design principles lean heavily towards option 3. If it was my decision, every Reunion API would have a root namespace something like Microsoft.MultiWordDescriptionWithoutDots, with sub-namespaces under that namespace if required. While I understand the reasoning behind the choice of Windows.Storage.Pickers for the original API, parroting that design exactly (while removing the use of the reserved Windows namespace) I feel does a disservice towards reorganizing these APIs. WinUI 3, with its Microsoft.UI.Xaml namespace, is IMO a very bad choice of namespace, but it is of course too late to change that project. I am raising this early so we don’t make the same mistake. Thanks! #Resolved

@ZenBird-zz ZenBird-zz force-pushed the master branch 2 times, most recently from 943b5e3 to cee7d60 Compare June 30, 2020 23:28
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A great start! @ShawnSteele - can you help guide updates?

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# Background

The current FilePicker API for UWP has several limitations. Some of the top limitations
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How closely should we be following the .NET file open dialog?

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Should we encapsulate the core "picking" experience (the list of folders / files) into a stand-alone control so that developers can build their own picker UI for when they need additional features? For example, Notepad customizes the standard Win32 dialog to add an "Encoding" drop-down; Photoshop adds a bunch of advanced options; etc. The control would of course only work within the constraints of whatever permissions the app had (eg, just Pictures library) but relieves the developer of having to do all the messy filesystem work and trying to copy the look and feel of the "real" dialog.

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For example, Win32 apps can embed an Explorer control or use the ancient DlgDirListComboBox function.

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Could we start off with enabling the Win32 file/folder picker dialog from UWP and then make improvements to provide a modern UI.

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@zenbird the dialog needs to run out-of-proc in the broker in order to access the files and then grant them to the UWP process. So the existing dialogs can be used, but there still needs to be some code in the middle to jump over to the broker and back again. #Resolved

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Should we encapsulate the core "picking" experience (the list of folders / files) into a stand-alone control so that developers can build their own picker UI for when they need additional features? For example, Notepad customizes the standard Win32 dialog to add an "Encoding" drop-down; Photoshop adds a bunch of advanced options; etc. The control would of course only work within the constraints of whatever permissions the app had (eg, just Pictures library) but relieves the developer of having to do all the messy filesystem work and trying to copy the look and feel of the "real" dialog.

The existing File Picker UIs will co-exist with the Reunion ones - so I don't think there is a huge need to support rendering of GDI elements.

Any new WinUI XAML based dialog, could support custom content, and the UIs get built with WinUI.
In fact I proposed that the main content region could display XAML content, as well as HTML, with OneDrive, Google Drive and Photos as examples.

image

The Photos example, being a WinUI app, could provide a picker UI that renders in the dialog.

image

As for the customisations made by Notepad and Adobe - I believe these use existing Win32 APIs for adding controls. So at least in the mockup designs I have worked on, I visualised these as a collapsible panel containing WinUI controls.

image

microsoft/microsoft-ui-xaml#2854


Then there is the question of whether this API makes its way to Xbox, Surface Hub and Hololens. I would initially suggest that the APIs should match all platforms, but with a different UI/UX to suit the platform - and any overrides such as file system restrictions

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Correct. V0.5 of the picker will use the existing win32 dialogs until we figure out the details of the intermediate process that will "broker" the permissions.


In reply to: 488307896 [](ancestors = 488307896)

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The goal of this API is to address the gaps in the existing File/Folder picker APIs. The API surface is similar to the existing
Picker APIs in Windows SDK with additional methods to support File + Folder picker and multiple folder picker. The API removes the
deprecated methods from Windows SDK.
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When returned to an app, I assume the app has all the same access to these objects as if they'd been picked by the platform API instead? Future access, available through CreateFileFromApp/FindFirstFileExFromApp, etc. #Resolved

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That's not the case now for the pickers and the behavior should remain the same. E.g. The items returned from the picker are available temporarily and are not available by PATH or any other means unless added to the MRU or FutureAccessList. In particular the implementation must NOT internally add items to either list as the contents of those lists are owned by the application - not the system. Though we may want to take the opportunity here to include the user intent that access is supposed to only be one time to and block adding the item to the MRU/FAL @ptorr-msft may have some thoughts on that as he's talked about that before. #Resolved

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Though we may want to take the opportunity here to include the user intent that access is supposed to only be one time to and block adding the item to the MRU/FAL

This in turn begs the question: If you are blocked from adding a path selected via the picker to the MRU/FAL, then how are you supposed to populate those lists in the first place? (Especially in an AppContainer app, where the only way to get access to arbitrary paths is to use the picker.) This is a bizarre limitation, especially since the platform pickers don’t do this. If we go through with this idea, then apps will lose functionality by moving to Reunion. This does not sound like a good idea to me.

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Since we're blue-skying here... the ultimate goal is for the duration of the consent to be specified by the user -- "Until I close the app" or "Always" or "Only when the app is in the foreground" etc. -- and also the scope of the grant (read-only vs. read/write) to be under their control. The apps should not be required to use FAL in order to maintain access once we do this; it should "just work."

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I agree. The picker should return a vector if IStorageItem with no guarantees on the underlying object.


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mdtauk commented Jul 17, 2020

Will this specification include the notion of WinUI/UWP apps acting as file providers, rendering UI within this new File Dialog?

The conversation here microsoft/microsoft-ui-xaml#2854 brought up apps like Camera which can appear within the Win32 file dialog, but which do not work very well today. #Resolved

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The goal of this API is to address the gaps in the existing File/Folder picker APIs. The API surface is similar to the existing
Picker APIs in Windows SDK with additional methods to support File + Folder picker and multiple folder picker. The API removes the
deprecated methods from Windows SDK.
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That's not the case now for the pickers and the behavior should remain the same. E.g. The items returned from the picker are available temporarily and are not available by PATH or any other means unless added to the MRU or FutureAccessList. In particular the implementation must NOT internally add items to either list as the contents of those lists are owned by the application - not the system. Though we may want to take the opportunity here to include the user intent that access is supposed to only be one time to and block adding the item to the MRU/FAL @ptorr-msft may have some thoughts on that as he's talked about that before. #Resolved

String CancelButtonText { set; }
Windows.Foundation.Collections.IMap<String, String> FilterAndDescription{ get; }
PickerViewMode ViewMode;
StorageItemPickerKinds PickerKinds;
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PickerKinds [](start = 35, length = 11)

ItemKinds #Resolved

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I think another feature that can be added in reunion picker api is the choice to add custom options to picker dialog like Win32 apps Notepad and Microsoft Word do:

WINWORD_IMRdJFIyN0
notepad_8albpPKwAM

This can either be done in the same way PrintManager allows custom options or hosting custom xaml control in the picker dialog itself.

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mdtauk commented Jul 29, 2020

We were discussing implementing those custom items with a future File Picker Dialog.
FIle Picker Dialog Breakdown
microsoft/microsoft-ui-xaml#2854

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Currently this is not in scope. We can look to address this as part of future work.


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ZodmanPerth commented Sep 24, 2020

Can we consider the case for using the FileSavePicker to allow the user to specify a filename in a folder location without allowing the "overwrite existing file" prompt? Some sort of boolean to control if selecting an existing files is allowed would be wonderful. #Resolved

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Poopooracoocoo commented Sep 29, 2020

so this is opt-in for apps? :( #Resolved

this really shouldn't be up to apps to choose. >:( #Resolved

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This is not going to replace the existing FilePicker api. Apps can choose to use this API instead of the existing FilePicker.


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mdtauk commented Sep 29, 2020

Will this API apply to platforms like Xbox where file storage is handled differently?

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I am not aware of Reunion effort targeting platforms other than Desktop. Maybe @jonwis can comment on this.


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Next up, @ShawnSteele


**3. Unable to specify an arbitrary start location for the picker.**

The existing File/Folder pickers do not allow the developer to specify an arbitrary start location (even if the app has access). Currently, the start location is limited to a set of predefined enum values.
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Please line-wrap at 100 columns. VSCode has various Prettifier plugins that'll do that for you. #Resolved

APIs in the Windows SDK. The Reunion Picker API will supercede the existing APIs and add additional methods
for the functionality: File and folder picker, Multiple folder picker.

- Windows.Storage.Pickers.FileOpenPicker (https://docs.microsoft.com/en-us/uwp/api/Windows.Storage.Pickers.FileOpenPicker)
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Make these real links, like [nice text](http://link/here) #Resolved

if(0 < storageItems.Count)
{
}
```
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Markdown usually likes additional blank lines after headers and triple-ticks. If it's rendering don't worry about it. #Resolved

```c#
var picker = new StorageItemPicker();
picker.FiltersAndDescriptions.Insert("Images", "*.jpg, *.png");
picker.StartLocation = startLocation;
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Expand sample to show the type of startLocation #Resolved

Picker APIs in Windows SDK with additional methods to support File + Folder picker and multiple folder picker. The Project Reunion APIs will supercede the Windows APIs.

# Examples
## Show file and folder picker
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More descriptive title - "Pick specific images or a folder to open" #Resolved

String CommitButtonText;
String CancelButtonText;
Windows.Foundation.Collections.IPropertySet FiltersAndDescriptions{ get; };
ViewMode PickerViewMode;
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Should be PickerViewMode DefaultViewMode; instead ... the user can change the view mode during the pick operation, so either Default... or Initial... to say that it's the app's desired initial state, but not a requirement. #Resolved

# API Notes
# API Details
```c#
namespace Microsoft.Reunion.Storage.Pickers
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Not sure this is the right namespace yet. #Resolved

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@DrusTheAxe DrusTheAxe Oct 6, 2020

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Discussions to date have agreed namespaces shouldn't include 'Reunion' (or ProjectReunion) in their name, and recommended variants of existing APIs should use variants of existing namespaces but Microsoft. instead of Windows. e.g. Microsoft.Storage.Pickers

@jonwis docs\Coding-Guidelines.md makes no mention of namespace guidance. We should add it (in a new WinRT section)? #Resolved

```c#
namespace Microsoft.Reunion.Storage.Pickers
{
enum PickerViewMode
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Should probably be StorageItemPickerViewMode ? #Resolved

String SuggestedSaveFile;
String DefaultFileExtension;
Boolean MultiSelect;
Int64 Result{ get; }
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What is this? #Resolved

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This holds the dialog result(Canceled, Access_Denied etc.). This can be removed in favor of packaging the result with IAsyncOperation


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StorageItemPicker();

/// Properties
String StartLocation;
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This should probably be StartLocationFolderPath, since it's a path. What happens if the app does not have access to this path? Is there a prompt for the user to approve picking from here to start with? Or is the act of picking implicit approval? #Resolved

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IMO, this API app should accept an arbitrary folder path when running in an AppContainer, but not allow any other operations on that folder or its contents except through the usual methods.

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Can I specify a StartLocation via a StorageFolder e.g.

var sip = new StorageItemPicker();
sip.Start = Windows.Storage.KnownFolders.PicturesLibrary;

I can see merit in both

String StartFolderPath;
StorageFolder StartFolderLocation;

and .ShowPickerAsync() throws an exception if both are specified

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Woudn't you be able to just use the Path API on the StorageFolder? E.g.:

var sip = new StorageItemPicker();
sip.StartFolderPath = Windows.Storage.KnownFolders.PicturesLibrary.Path;

The documentation for Path states "The full path of the current folder in the file system, if the path is available", so perhaps that's a scenario which would require one can specify a StorageFolder as the StartLocation (no full path available)?

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StorageFolders that represent libraries like the PicturesLibrary don't necessarily have paths, since they are shell constructs and not filesystem directories. You could get the 'best' directory from SHGetKnownFolderPath though (.NET has an equivalent).

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Yes, as I have mentioned in the original thead here, using the .NET equivalent could look like:

var sip = new StorageItemPicker()
{
    StartFolderPath = Environment.GetFolderPath(Environment.SpecialFolder.MyPictures)
};

so at least in that case, we would be fine without shipping a specific StorageFolder StartFolderLocation API.

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IMO, this API app should accept an arbitrary folder path when running in an AppContainer, but not allow any other operations on that folder or its contents except through the usual methods.

Yes, the point of the picker is to get files you don't have access to. If the user doesn't like the location, they can change it.

Relying on a single, fixed list of locations (current Windows. API) or relying on the app already having access vastly reduces the functionality. For example, if I already have access to C:\Foo\bar.txt I might want the user to pick another file from C:\Foo\ even though I don't have access. (I believe the current API remembers the last start location, but that doesn't help if the user picked another file in the meantime...)/

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The new pickers should be easy to nest into user controls or dialogs, and should allow simple access from MVVM viewmodels. Don't repeat WPF's mistakes.

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This can be enabled via a property similar to Win32 IFileDialog interface.


In reply to: 698086497 [](ancestors = 698086497)

Windows.Foundation.Collections.IPropertySet FiltersAndDescriptions{ get; };
ViewMode PickerViewMode;
StorageItemPickerKinds PickerKinds;
String SuggestedSaveFile;
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Suggested? Do we use that terminology? Default seems more natural

File sounds like an object, but this is just a filename. String DefaultSaveFilename? #Resolved

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Suggested mirrors the SuggestedStartLocation, although most WinRT APIs use the term Prefer or Request when the app is giving a hint that the platform can ignore. .NET just calls it FileName (note the different capitalization as well... which is quite dated since now the world recognizes "filename" as a single word in the English language).

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PreferredFilename?


In reply to: 500440519 [](ancestors = 500440519)

picker.FiltersAndDescriptions.Insert("Images", "*.jpg, *.png");
picker.StartLocation = startLocation;
picker.PickerKinds = StorageItemPickerKinds.Folder | StorageItemPickerKinds.FileOpen;
// multi-select will be automatically set
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Multi-select is the default? Is that what applications expect? It defaults to false in the .NET pickers. #Resolved

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MultiSelect is being automatically set since the PickerKind is both files and folders. Multiselect is false by default.


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That doesn't logically follow though... it's legitimate to want to pick a single file or a single folder. Also, having one property change value based on another property's value is against guidelines. For example, the following two bits of code should be equivalent:

picker.PickerKinds = Folder | FileOpen;
picker.Multiselect = false;

and

picker.Multiselect = false;
picker.PickerKinds = Folder | FileOpen;

But they are not equivalent; the first one works as expected, but the second one does not. #Resolved

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Updated to false by default. No automatic setting of the property.


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}
```

## Pick folders
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@ZenBird-zz ZenBird-zz Oct 13, 2020

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s [](start = 14, length = 1)

Pick folder no "s" at the end. Picking a single folder. #Resolved

Adding StorageItemPickerResult to return the result of the operation.
Added more code to the samples.
Addressed feedback comments
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ghost commented Mar 28, 2021

@zenbird what happened to this PR?

@mdtauk
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mdtauk commented May 15, 2021

Yea, what is the status of the updated XAML based File Pickers?

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