IStorageProviderKnownFolderSyncInfoSource Interface

Definition

Namespace:

Windows.Storage.Provider

The interface that a cloud provider implements to provide information about the sync status of known folders.

public interface class IStorageProviderKnownFolderSyncInfoSource

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Storage.Provider.CloudFilesContract, 458752)]
/// [Windows.Foundation.Metadata.Guid(1362465602, 63424, 21456, 187, 182, 28, 220, 9, 142, 189, 169)]
struct IStorageProviderKnownFolderSyncInfoSource

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Storage.Provider.CloudFilesContract), 458752)]
[Windows.Foundation.Metadata.Guid(1362465602, 63424, 21456, 187, 182, 28, 220, 9, 142, 189, 169)]
public interface IStorageProviderKnownFolderSyncInfoSource

Public Interface IStorageProviderKnownFolderSyncInfoSource

Attributes

ContractVersionAttribute GuidAttribute

Windows requirements

Device family	Windows 11 Insider Preview (introduced in 10.0.23504.0)
API contract	Windows.Storage.Provider.CloudFilesContract (introduced in v7.0)

Examples

The following example shows a storage provider's implementation of IStorageProviderKnownFolderSyncInfoSource:

namespace winrt::CloudMirror::implementation
{
    struct MyKnownFolderInfoSource : implements<MyKnownFolderInfoSource,
            winrt::CloudMirror::IStorageProviderKnownFolderSyncInfoSource>
    {
        MyKnownFolderInfoSource();

        StorageProviderKnownFolderSyncInfo GetKnownFolderSyncInfo();

        winrt::event_token KnownFolderSyncInfoChanged(
            winrt::Windows::Foundation::TypedEventHandler<IStorageProviderKnownFolderSyncInfoSource,
            winrt::Windows::Foundation::IInspectable> const& handler);
        void KnownFolderSyncInfoChanged(winrt::event_token const& token) noexcept;

    private:
        winrt::hstring GetProviderDisplayName();
        winrt::Uri GetAvailableIcon();
        winrt::Uri GetEnrollingIcon();
        void NotifyStateChanged();

    winrt::event<winrt::TypedEventHandler<IStorageProviderKnownFolderSyncInfoSource, IInspectable>> m_changedEvent;
        std::vector<StorageProviderKnownFolderEntry> m_knownFolderEntries;
    };
}

...

using namespace winrt::Windows::Storage::Provider;

namespace winrt::CloudMirror::implementation
{
    MyKnownFolderInfoSource::MyKnownFolderInfoSource()
    {
        // The cloud provider would assess its current state and use it to
        // inform File Explorer. In this example, Documents is available for
        // backup, Pictures is currently enrolling, and Downloads is already
        // backed up (enrolled).
        winrt::StorageProviderKnownFolderEntry documents{};
        documents.KnownFolderId(FOLDERID_Documents);
        documents.Status(StorageProviderKnownFolderSyncStatus::Available);
        m_knownFolderState.push_back(documents);

        winrt::StorageProviderKnownFolderEntry pictures{};
        pictures.KnownFolderId(FOLDERID_Pictures);
        pictures.Status(StorageProviderKnownFolderSyncStatus::Enrolling);
        m_knownFolderState.push_back(pictures);

        winrt::StorageProviderKnownFolderEntry downloads{};
        downloads.KnownFolderId(FOLDERID_Downloads);
        downloads.Status(StorageProviderKnownFolderSyncStatus::Enrolled);
        m_knownFolderState.push_back(downloads);
    }

    // GetKnownFolderSyncInfo is called by File Explorer whenever it needs to get the
    // latest known folder sync status from the cloud provider. Once returned, the
    // StorageProviderKnownFolderSyncInfo is considered immutable.
    //
    // A SyncRequested handler must be set on the returned object to be considered valid
    // and to be displayed in File Explorer.
    StorageProviderKnownFolderSyncInfo MyKnownFolderInfoSource::GetKnownFolderSyncInfo()
    {
        winrt::StorageProviderKnownFolderSyncInfo info{};
        info.ProviderDisplayName(GetProviderDisplayName());
        // Setting a SyncRequested handler to respond to user action.
        auto syncRequestHandler = [](
            winrt::CloudMirror::StorageProviderKnownFolderSyncRequestArgs const& args)
        {
            // The user wants to sync some known folders with our cloud provider.
            // We can show some UI to sign in, confirm their choice, etc.
            MyStorageProviderSyncManager::ShowFolderEnrollmentUI(args.KnownFolders(), args.Source());

            // Or we can immediately start syncing the requested folders.
            MyStorageProviderSyncManager::StartSyncingFolders(args.KnownFolders(), args.Source());
        };

        info.SyncRequested(syncRequestHandler);
        info.KnownFolderEntries().ReplaceAll(m_knownFolderEntries);
        return info;
    }
}

Remarks

File Explorer obtains an instance of IStorageProviderKnownFolderSyncInfoSource for a given provider by calling GetKnownFolderSyncInfoSource.

This interface provides a KnownFolderSyncInfoChanged event, which the app raises when any property or folder status changes, including the display name. The cloud provider should not expect GetKnownFolderSyncInfoSource to be called immediately after raising the event. File Explorer will only request a new object as it's needed.

Methods

GetKnownFolderSyncInfo()

GetKnownFolderSyncInfo is called by File Explorer whenever it needs to get the latest known folder sync status from the cloud provider.

Events

KnownFolderSyncInfoChanged

The event that is raised when the sync status of a known folder changes.

See also

• GetKnownFolderSyncInfoSource()
• KnownFolderSyncInfoChanged