JamItemIdList.TItemIdListHelper

Helper class for ItemIdLists.

Syntax

Pascal

TItemIdListHelper = class;

Remarks

We're dealing with IItemIdLists throughout ShellBrowser. This class avoids the need to extend the interface for every helper method. Also there are no extensions for interfaces.

Namespace

JamItemIdList

TItemIdListHelper Methods

	Name	Description
	class function HasSubFolders(const pItemIdList: IItemIdList; const pFileSystemOnly: boolean): boolean;	Determines if the ItemIdList has subfolders.
	class function IsFileAndFolder(const pItemIdList: IItemIdList): boolean;	Determines if the passed ItemIdList is both a folder but also has an associated stream, such as for zip-files.
	class function IsNetworkPath(const pItemIdList: IItemIdList): Boolean;	Checks if the provided ItemIdList is of a network path (mapped or UNC does not matter)
	class function IsNetworkPathReachable(const pItemIdList: IItemIdList; const pTimeout: Integer; const pCancellationIndicator: ICancellationIndicator = nil): Boolean;	Checks if a given network path is accessible
	class function IsNullOrInvalid(const pItemIdList: IItemIdList): boolean;	Determines if the ItemIdList is not assigned or invalid.
	class function IsUNCPath(const pItemIdList: IItemIdList): Boolean;	Checks if the provided ItemIdList is of a UNC path
	class function SupportsIShellFolder2(const pItemIdList: IItemIdList): boolean;	Determines if the passed ItemIdList supports IShellFolder and IShellFolder2. This is needed for certain operations, like retrieving columns.
	class function TryGetSpecialFolder(const pItemIdList: IItemIdList; const pStopAfter: integer; var pFinished: Boolean; const pCancellationIndicator: ICancellationIndicator): TJamShellFolder;	Asynchronously retrieves the SpecialFolder for an ItemIdList.
	class function TryHasSubFolders(const pItemIdList: IItemIdList; const pStopAfter: integer; const pFileSystemOnly: Boolean; var pFinished: Boolean; const pCancellationIndicator: ICancellationIndicator = nil): Boolean;	Asynchronously determines if the ItemIdList has subfolders.
	class function TryIsInvalid(const pItemIdList: IItemIdList; const pStopAfter: integer; const pCancellationIndicator: ICancellationIndicator = nil): boolean;	Asynchronously checks if the ItemIdList is valid. If the call is slow, returns true after a given timespan.
	class function TryReload(const pItemIdList: IItemIdList; const pStopAfter: integer; var pFinished: Boolean; const pCancellationIndicator: ICancellationIndicator = nil): boolean;	Tries reloading the ItemIdList asynchronously giving the operation only a definable amount of time.
	class procedure WriteDebugInfo(const pItemIdList: IItemIdList; const pMessage: string);	Outputs verbose info of the passed ItemIdList.

Links

JamItemIdList, Legend, Members, TItemIdListHelper Methods

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