Jam.Shell.Controls.DriveList.TJamDriveList

Component lists all drives of the system.

Syntax

Pascal

TJamDriveList = class(TJamCustomFileList, IDiskSpaceViewer);

Remarks

JamDriveList lists all local and network drives of the system. It also displays the capacity and the free space of each drive. You can use the Add or AddEditable method to add files or folders to the list.

It is not possible to rename drives using the shell contextmenu's rename command or by pressing F2. Instead in combination with AddEditable renaming can be used to add new items to the list.

Namespace

Jam.Shell.Controls.DriveList

Public Methods

Jam.Shell.Controls.BaseShellListView.TJamBaseShellListView

	Name	Description
	constructor Create(AOwner: TComponent); override;	Creates and intializes an instance of this component.
	destructor Destroy; override;	Destroys an instance of a TJamBaseShellListView component

Jam.Shell.Controls.BaseShellListView.TJamCustomFileList

	Name	Description
	constructor Create(AOwner: TComponent); override;	Constructor of an instances of a TJamCustomFileList component
	destructor Destroy; override;	Destructor of an instances of a TJamCustomFileList component

Jam.Shell.Controls.DriveList.TJamDriveList

	Name	Description
	constructor Create(AOwner: TComponent); override;	Creates an instance of a TJamDriveList component
	destructor Destroy; override;	Destroys an instance of a TJamDriveList component

TJamBaseShellListView Events

Jam.Shell.Controls.BaseShellListView.TJamBaseShellListView

	Name	Description
	property OnAfterShellColumnChanged: TOnAfterShellColumnChangedEvent read fOnAfterShellColumnChanged write fOnAfterShellColumnChanged;	This event is triggered before the user changes the columns by using the header context menu.
	property OnBeforeShellColumnChanged: TOnBeforeShellColumnChangedEvent read fOnBeforeShellColumnChanged write fOnBeforeShellColumnChanged;	This event is triggered before the user changes the columns by using the header context menu.
	property OnGetColumnInfo: TOnGetColumnInfo read fOnGetColumnInfo write fOnGetColumnInfo;	This event can be implemented to customize columns. It is called when a column is added to the view, but also when the header context menu or the column selection dialog is displayed.
	property OnSort: TOnSort read fOnSort write fOnSort;	This event is triggered before and after the sort.

Jam.Shell.Controls.BaseShellListView.TJamCustomFileList

	Name	Description
	property OnAddItem: TOnAddItem read fOnAddItem write fOnAddItem;	This event is fired if a file is to be added to the listview.
	property OnAddPath: TOnAddPath read fOnAddPath write fOnAddPath;	OnAddPath occurs, whenever a new path is added to the listview.
	property OnBeforeCommand: TOnBeforeCommand read GetOnBeforeCommand write SetOnBeforeCommand;	The OnBeforeCommand event is fired before a command (usually a context menu command) is executed.
	property OnBeforeShellCommand: TOnBeforeShellCommand read GetOnBeforeShellCommand write SetOnBeforeShellCommand;	This event occurs, before a context menu command is executed. This event is deprecated and will be removed. Use Jam.Shell.Controls.BaseShellListView.TJamCustomFileList.OnBeforeCommand instead.
	property OnBeforeShellDrag: TOnBeforeShellDragEvent read fOnBeforeShellDrag write fOnBeforeShellDrag;	Happens when the user starts a shell drag operation.
	property OnBeforeShellDrop: TOnBeforeShellDropEvent read fOnBeforeShellDrop write fOnBeforeShellDrop;	Allows you to prevent unwanted shell drops.
	property OnCheckStateChanged;	This event is fired, if the state of a checkbox was changed by the user.
	property OnOperation;	The OnOperation event occurs after a shell operation like pasting or dragging and dropping files was performed.

Jam.Shell.Controls.DriveList.TJamDriveList

	Name	Description
	property OnDriveSpaceChanged: TOnDriveSpaceChanged read fOnDriveSpaceChanged write fOnDriveSpaceChanged;	The OnDriveSpaceChanged event is fired, when the total or free space of one of the listed drives changes.
	property OnListItemAction: TOnListItemEvent read fOnListItemEvent write fOnListItemEvent;	This event occurs after the existance of DriveListItems has been checked asnchronously.
	property OnShellNotification;	This event occurs, when the DriveList receives shell notifications.

ICancellationIndicator Methods

	Name	Description
	function IsCancellationRequested: Boolean;	Gets whether cancellation has been requested for this token.

Jam.Threading.ICancellationToken

	Name	Description
	procedure Cancel;	Communicates a request for cancellation.

ShellLink.IJamShellControl

	Name	Description
	procedure FileChanged(FolderPIDL: IItemIdList; FilePIDL: IItemIdList);	This method is called by the ShellLink instance if the currently selected item has changed.
	function getShellLink: TJamShellLink;	Getter method for the ShellLink property.
	function GoUp: Boolean;	This method indicates that the callee should go up one level and display the contents of the current folder's parent folder.
	procedure PathChanged(FolderPIDL: IItemIdList);	This method is called by the ShellLink instance if the currently displayed folder has changed.
	procedure Refresh(pRefreshLevel: TRefreshLevel; pItemIdList: IItemIdList = nil);	This method indicates that the control should perform a refresh of its contents.
	procedure SelectAll;	This method indicates that the callee should select all item it currently displays.
	procedure setShellLink(aValue: TJamShellLink);	Setter method for the ShellLink property.

Jam.Shell.Controls.BaseShellListView.TJamBaseShellListView

	Name	Description
	procedure AutoAdjustColumnWidths(const pMinWidth: integer = 50; const pMaxWidth: integer = 750);	Auto adjust the widths of all columns.
	function FindCaption(StartIndex: Integer; Value: string; Partial: Boolean; Inclusive: Boolean; Wrap: Boolean): TListItem; virtual;	Returns a list view item, if any, with the specified caption. See TCustomListView.FindCaption
	function GetColumnPosition(const pColumnID: TShellColumnId): NativeInt; virtual; deprecated;	Returns the current column index for a given TSHColumnId.
	function GetDragImages: TDragImageList; override;	Returns a drag cursor if a list item is being dragged.
	function GetVisibleColumns: TColumnArray; deprecated;	Use this function to get an array of currently visible columns.
	function IsColumnVisible(const pColumnID: TShellColumnId): Boolean;	Returns whether the given SHColumnId is currently visible or not.
	function IsEmpty: Boolean;	Checks if the list is empty.
	function IsItemSelected(pIndex: integer): boolean;	Checks if the Item with the passed index is selected.
	procedure ResetColumns;	Resets the current columns and the saved widths for the current special folder and restores the initial state.
	procedure SelectAll; override;	Selects all Items in a TJamShellList.
	function SetColumnVisibility(const pColumnID: TShellColumnId; const pVisible: Boolean): Integer; virtual;	Set the visibility of a column.
	function ShowContextMenu(const p: TPoint): String; virtual;	Use this method to display the context menu for the selected entry.
	procedure Sort; overload;	Triggers sorting by the current settings (SortedBy, SortOrder)
	procedure Sort(const pColumn: TShellColumnId; const pSortDirection: TJamSortDirection); overload;	Sorts the current view by the passed attribute in the passed order.

Jam.Shell.Types.IUICommandInvokable

	Name	Description
	function GetSelCount: Integer;	Returns the number of selected Objects in the control.
	function InvokeCommandOnSelected(const pCommand: TShellCommand): Boolean;	Executes a shell command on the objects selected in the control.
	function ShowContextMenu(const pPosition: TPoint): String;	Displays a context menu for the selected items.

ShellLink.IJamMultiSelectShellControl

	Name	Description
	function GetSelectedElements: IItemIdListCollection;	Returns an IItemIdListCollection containing the selected ItemIdLists or an empty list if nothing is selected.

Jam.Shell.Controls.BaseShellListView.TJamCustomFileList

	Name	Description
	function Add(const pItemIdList: IItemIdList; pChecked: Boolean = false; pPos: integer = -1): TJamFileListItem; virtual; overload;	Adds a file or folder to the list.
	function Add(const pPath: UnicodeString; pChecked: Boolean = false; pPos: integer = -1): TJamFileListItem; virtual; overload;	Adds a file or folder to the list.
	procedure AddStrings(pPaths: TStrings; pInitiallyChecked: Boolean = false);	Add a list of paths to the list.
	procedure CheckAll;	Checks all items in the list
	procedure Clear; override;	Removes all items from the FileList
	procedure DeleteItem(const pFullPath: UnicodeString);	Removes an item from the list view and frees the associated memory.
	procedure FullRefresh; override;	Executes a full refresh on the control.
	function GetFullPath(Index: Integer): UnicodeString; overload;	Use this function to get the full path of an item of the list.
	function GetFullPath(item: TJamFileListItem): UnicodeString; overload;	Use this function to get the full path of an item of the list.
	function GetSelectedElements: IItemIdListCollection; virtual;	Returns an IItemIdListCollection containing the selected ItemIdLists or an empty list if nothing is selected.
	function InvokeCommandOnSelected(const pCommand: TShellCommand): Boolean;	Executes a command of the context menu of the current object.
	function InvokeContextMenuCommand(const Command: String): Boolean; deprecated;	Executes a command of the context menu of the current object.
	function IsItemInList(const FileName: UnicodeString): Boolean;	Checks whether an item with the given filename can be found in the list.
	function ReturnItemInList(const pFilePath: UnicodeString; const lStartIndex: integer = 0): TJamFileListItem; virtual;	Returns the item that is associated to the filename, if it is in the list, otherwise nil.
	procedure SelectAll; override;	Selects all items of the list.
	function ShowContextMenu(const p: TPoint): String; override;	Show the context menu for the selected items.
	procedure SmartRefresh; override;	Executes a quick refresh on the control.
	procedure UnCheckAll;	Sets the Checked state of all Items to "unchecked" (false).

Jam.Shell.Controls.DriveList.TJamDriveList

	Name	Description
	function Add(const Path: UnicodeString; Checked: Boolean = false; pPos: integer = -1): TJamFileListItem; override;	Adds a drive or path to the drive list.
	function AddEditable(const Path: UnicodeString; Checked: Boolean = false): TJamFileListItem;	Add an object to the list and sets the item to edit-mode.
	procedure FillDriveList;	Populates the drive list and ensures that all drives that are currently available are present in the list.
	procedure FullRefresh; override;	Enures that all drives that are currently available are present in the list and recalculates their free and total disk space.
	procedure SmartRefresh; override;	Executes a quick refresh on the control.

IJamShellControl Properties

ShellLink.IJamShellControl

	Name	Description
	property ShellLink: TJamShellLink read getShellLink write setShellLink;	The TJamShellLink instance to which the current control connected.

Jam.Shell.Controls.BaseShellListView.TJamBaseShellListView

	Name	Description
	property AutoSizeColumn: Integer read fAutoSizeColumn write fAutoSizeColumn default -;	Adjust the size of the given column so that it fills the remaining horizontal space.
	property ChangeDelay: Integer read GetChangeDelay write SetChangeDelay;	The delay in ms after the selection has been changed before connected controls are informed. Default 100 ms.
	property Columns: TJamShellListColumns read GetColumns write SetColumns;	Gets the collection of all column headers that appear in the control.
	property DefaultColumnWidth: integer read fDefaultColumnWidth write SetDefaultColumnWidth default -;	Sets the column width that is used in ViewStyle vsList
	property DoubleBuffered default True;	Determines whether the control's image is rendered directly to the window or painted to an in-memory bitmap first.
	property IconSize: TJamIconSize read GetIconSize write SetIconSize;	The TJamIconSize that shall be used in viewstyle vsIcon.
	property IconSpacing: Integer read fIconSpacing write SetIconSpacing default -;	Lets you control the spacing between the large icons and thumbnails. -1 means the spacing is automatically set. A value >= 0 will be added to the width and height of the images of the current view. The small icons should not be affected by this property.
	property OnCreateColumns: TNotifyEvent read fOnCreateColumns write fOnCreateColumns;	This event is triggered after the columns were created
	property OnCreateItemClass;	OnCreateItemClass occurs when a list item object is about to be created.
	property ParentFont read GetParentFont write SetParentFont default False;	Specifies where a control looks for its font information.
	property ReadOnly read GetReadOnly write SetReadOnly default false;	Prevents operations that change the file system from being executed.
	property ShellContextMenu: Boolean read fContextMenu write fContextMenu default True;	Automatically display the shell context menu.
	property ShowHeaderContextMenu: Boolean read fShowHeaderContextMenu write fShowHeaderContextMenu default True;	Use this property to determine if the header conext menu should be displayed when the user right clicks on the columns
	property UseSystemStyles: Boolean read fUseSystemStyles write SetUseSystemStyles default true;	Use the same styles as the Windows Explorer.
	property Version: String read GetVersion stored false;	The version number of the ShellBrower controls.

Jam.Shell.Controls.BaseShellListView.TJamCustomFileList

	Name	Description
	property Align;	Gets or sets the alignment of items in the control.
	property Anchors;	Gets or sets the edges of the container to which a control is bound and determines how a control is resized with its parent.
	property BorderStyle;	Gets or sets the border style of the control.
	property Checkboxes;	See TCustomListView.Checkboxes
	property Color;	Specifies the background color of the control.
	property Constraints;	Specifies the size constraints for the control.
	property Ctl3D;	Determines whether a control has a three-dimensional (3-D) or two-dimensional look.
	property Details;	Choose if details of the listed objects should be shown.
	property DragCursor;	Specifies the image used to represent the mouse pointer when the control is being dragged.
	property DragKind;	Specifies whether the control is being dragged normally or for docking.
	property DragMode;	Specifies how the control initiates drag-and-drop or drag-and-dock operations.
	property Enabled;	Controls whether the control responds to mouse, keyboard, and timer events.
	property FlatScrollBars;	Specifies whether the list view's scroll bars are flat.
	property Font;	Controls the attributes of text written on or in the control. Make sure to turn off UseSystemFont before editing this control! Otherwise the changes will not persist.
	property FullDrag;	Specifies whether headers are repainted when they are dragged.
	property GridLines;	Determines whether grid lines appear between the rows and columns containing the items and subitems in the control.
	property HideSelection;	Determines whether the list view gives a visual indication of which item is selected when focus shifts to another control.
	property Hint;	Hint contains the text string that can appear when the user moves the mouse over the control.
	property HotTrack;	Specifies whether list items are highlighted when the mouse passes over them.
	property IconOptions;	Determines how icons displayed in the list view are arranged.
	property ImeMode;	Gets or sets the Input Method Editor (IME) mode of the control.
	property ImeName;	Specifies the input method editor (IME) to use for converting keyboard input to Asian language characters.
	property Items: TJamFileListItems read GetItems;	Contains the list of items displayed by the list view.
	property MultiSelect default True;	Determines whether the user can select more than one list item at a time.
	property OleDragDrop;	Allow drag and drop operations with the Explorer.
	property OnAdvancedCustomDraw;	See TCustomListView.OnAdvancedCustomDraw
	property OnAdvancedCustomDrawItem;	See TCustomListView.OnAdvancedCustomDrawItem
	property OnAdvancedCustomDrawSubItem;	See TCustomListView.OnAdvancedCustomDrawSubItem
	property OnChange;	Occurs immediately after an item in the list changes.
	property OnChanging;	Occurs when an item in the list is about to change.
	property OnClick;	Occurs when the user clicks the control.
	property OnColumnClick;	Occurs when the user clicks on a column header in a list view.
	property OnColumnDragged;	Occurs when a column is dragged to a new position.
	property OnColumnRightClick;	Occurs when the user right clicks on a column header in a list view.
	property OnCompare;	Occurs when two items need to be compared during a sort of the list.
	property OnContextPopup;	See TControl.OnContextPopup
	property OnCustomDraw;	See TCustomListView.OnCustomDraw
	property OnCustomDrawItem;	See TCustomListView.OnCustomDrawItem
	property OnCustomDrawSubItem;	Occurs when a subitem must be rendered in an owner-draw list view.
	property OnDblClick;	Occurs when the user double-clicks the left mouse button when the mouse pointer is over the control.
	property OnDeletion;	See TCustomListView.OnDeletion
	property OnDragDrop;	Occurs when the user drops an object being dragged.
	property OnDragOver;	Occurs when the user drags an object over a control.
	property OnDrawItem;	See TCustomListView.OnDrawItem
	property OnEdited;	See TCustomListView.OnEdited
	property OnEditing;	See TCustomListView.OnEditing
	property OnEndDock;	See TControl.OnEndDock
	property OnEndDrag;	Occurs when the dragging of an object ends, either by dropping the object or by canceling the dragging.
	property OnEnter;	Occurs when a control receives the input focus.
	property OnExit;	Occurs when the input focus shifts away from one control to another.
	property OnGetImageIndex;	Occurs when an item is about to be displayed in the list view control.
	property OnInfoTip;	See TCustomListView.OnInfoTip
	property OnInsert;	See TCustomListView.OnInsert
	property OnKeyDown;	Occurs when a user presses any key while the control has focus.
	property OnKeyPress;	Occurs when key pressed.
	property OnKeyUp;	Occurs when a user presses any key while the control has focus.
	property OnMouseDown;	Occurs when the user presses a mouse button with the mouse pointer over a control.
	property OnMouseEnter;	Occurs when the mouse pointer moves over the control.
	property OnMouseLeave;	Occurs when the mouse pointer moves off from over the control.
	property OnMouseMove;	Occurs when the user moves the mouse pointer while the mouse pointer is over a control.
	property OnMouseUp;	Occurs when the user releases a mouse button that was pressed with the mouse pointer over a component.
	property OnMouseWheel;	Occurs when the mouse wheel is rotated.
	property OnResize;	Occurs immediately after the control is resized.
	property OnSelectItem;	See TCustomListView.OnSelectItem
	property OnStartDock;	See TControl.OnStartDock
	property OnStartDrag;	Occurs when the user begins to drag the control or an object it contains by left-clicking the control and holding the mouse button down.
	property ParentColor default false;	Specifies where a control looks for its color information.
	property ParentCtl3D;	Determines where a component looks to determine whether it should have a three-dimensional look.
	property ParentShowHint;	Determines where a component looks to determine whether it should have a three-dimensional look.
	property Paths: TFilenames read GetPathList;	Returns a list with the full paths of all items.
	property PopupMenu;	Specifies the pop-up menu associated with the control.
	property ReverseSortOrder;	Indicates if sort order is normal or reverse.
	property RowSelect;	Determines whether an entire row in the list view can be selected.
	property ScrollBars: TScrollStyle read fScrollBars write fScrollBars default ssBoth;	Determines whether the JamFileList control has scroll bars.
	property SelCount;	Specifies the number of selected items in the list view.
	property Selected: TJamFileListItem read GetSelected write SetSelected;	Returns the index of the selected item.
	property SelectedPath: UnicodeString read GetSelectedPath;	Returns the full path for the selected item.
	property SelectedPaths: TFilenames read GetSelectedPaths;	Returns a list with the full paths for the selected items.
	property ShowColumnHeaders;	Determines whether the column headers are displayed.
	property ShowContextMenuOnTop: Boolean read GetShowContextMenuOnTop write SetShowContextMenuOnTop;	Show the context menu on the top of the supplied Delphi TPopupMenu.
	property ShowHint;	ShowHint specifies whether to show the Help Hint when the mouse pointer moves over the control.
	property ShowOverlayIcons: Boolean read fShowOverlayIcons write SetShowOverlayIcons default false;	If set to false, no overlay icons will be shown, which improves the performance of the control.
	property SortColumn;	The column according to which the listed objects are sorted.
	property SortedBy;	The TShellColumnId of the column the view is currently sorted by.
	property SortOrder;	The current sort order of the view.
	property StateImages;	Specifies additional icon images to display next to each item in the list view.
	property TabOrder;	Indicates the position of the control in its parent's tab order.
	property TabStop default true;	Determines whether the user can tab to a control.
	property UseSystemFont;	Set this property to true if you want the component to utilize the default system font.
	property Visible;	Determines whether the component appears onscreen.

Jam.Shell.Controls.DriveList.TJamDriveList

	Name	Description
	property AutomaticRefresh default true;	Receives notifications about changes in the shell and performs refreshes automatically.
	property AutoSizeColumn;	Adjust the size of the given column so that it fills the remaining horizontal space.
	property CheckedDrives: TFilenames read GetCheckedDrives;	Returns a list of the checked drives.
	property CheckIfExists;	Offers the possibility to add items that do not exist in the file system.
	property DefaultUpdateInterval: Cardinal read fDefaultUpdateInterval write fDefaultUpdateInterval default cDefaultUpdateInterval;	Refresh interval for the contents of the DriveList. If 0 no regular refresh will take place.
	property DoubleBuffered;	Determines whether the control's image is rendered directly to the window or painted to an in-memory bitmap first.
	property ErrorColor: TColor read fErrorColor write fErrorColor default clRed;	The color free percentage column exceeding the ErrorLevelPercent threshold.
	property ErrorLevelPercent: Integer read fErrorLevel write fErrorLevel default 2;	If the free space on the drive is below this value, the bar will be drawn in red.
	property ExcludeList: TJamPathList read fExcludeList write SetExcludeList;	The ExcludeList contains drives, which should not be displayed in the TJamDriveList.
	property FileSystemOnly default False;	If true virtual objects that do not have a physical path are not accepted. Default value is false.
	property Initialized;	This property indicates whether the DriveList has been initialized.
	property IsSorted default true;	Turns sorting in the list on or off.
	property MultiSelect default false;	Determines whether the user can select more than one list item at a time.
	property OleDragDrop default false;	Allow drag and drop operations with the Explorer.
	property OnCanResize;	Occurs when an attempt is made to resize the control.
	property OnEdited;	This event is fired when an item has been edited.
	property OnEditing;	This event is fired when an item is being edited.
	property ParentDoubleBuffered;	ParentDoubleBuffered is a boolean indicating that the DoubleBuffered property of this component is overridden by the value of the parent's DoubleBuffered property.
	property ReadOnly default true;	Prevents operations that change the file system from being executed.
	property ShowShellObjectNames: Boolean read fShowShellObjectNames write SetShowShellObjectNames default true;	Determines whether the shell object name should be displayed.
	property StatusBarColor: TColor read fStatusBarColor write SetStatusBarColor default $00FF9090;	The color for the status bar that shows the free percentage.
	property StyleElements;	Specifies the style elements that are used by the control.
	property StyleName;	Specifies the style name for this control.
	property Touch;	Touch specifies the touch manager component associated with the control.
	property WarnColor: TColor read fWarnColor write fWarnColor default clYellow;	The color free percentage column exceeding the WarnLevelPercent threshold.
	property WarnLevelPercent: Integer read fWarnLevel write fWarnLevel default 8;	If the free space on the drive is below this value, the bar will be drawn in yellow.

Links

Jam.Shell.Controls.DriveList, Legend, Members, Public Methods, TJamBaseShellListView Events, ICancellationIndicator Methods, IJamShellControl Properties

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