Class TrDBTreeView
Unit
rDBTreeView
Declaration
type TrDBTreeView = class(TTreeView)
Description
database version of standard TTreeView component which provides function for loading datasets values to tree structure.
Hierarchy
Overview
Methods
Properties
Description
Methods
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constructor Create(AOwner: TComponent); override; |
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procedure EndUpdate; virtual; |
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procedure DragDrop(Source: TObject; X, Y: integer); override; |
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function GetSelectedData: TNodeObject; |
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return datastructure for selected node, Node.Data can be used too
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function GetNodeData(NodeAbsoluteIndex: integer): TNodeObject; |
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return datastructure for node according index, use AbsoluteIndex to get Node index
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procedure ProcessAllItems(UseChanged, UseMoved: boolean; CallBackProc: TTVChangedEvent; ResetState: boolean); |
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go through all items and call CallBackProc for each changed or moved item
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function FindNode(KeyField: TField; KeyValue: variant): TTreeNode; |
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try to find node according KeyField and value
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procedure RefreshData(Delayed: boolean = false; KeepSelectedNode: boolean = false); |
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reload all nodes
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procedure RefreshNode(Node: TTreeNode); |
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reload text of node, it uses current record, so dataset must be moved to correct record before calling
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procedure CreateChildNodes(ParentNode: TTreeNode; MultilevelNode, RemoveCurrentNodes: boolean); |
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create child nodes, it uses current dataset records, so number of items is defined by dataset
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procedure CreateSiblingNode(SiblingNode: TTreeNode); |
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create child nodes, it uses current dataset records, so number of items is defined by dataset
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Properties
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property MasterDataSource: TDataSource read GetMasterDataSource write SetMasterDataSource; |
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define datasource used for automatic loading of data
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property DataItemDefs: TDataItemDefs read FDataItemDefs write SetDataItemDefs; |
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define collection of DataItemDefinition
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property DataItemDesignTime: boolean read FDataItemDesignTime write SetDataItemDesignTime default true; |
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define whether data items is shown in design time and stored to DFM as items
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property LoadFirstLevelOnly: boolean read FLoadFirstLevelOnly write FLoadFirstLevelOnly default false; |
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define whether only first level of items is loaded and child data is loaded after expand of item
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property OnItemEdited: TTVChangedEvent read FOnItemEdited write FOnItemEdited; |
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event is called after edit text of item
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property OnItemMoved: TTVChangedEvent read FOnItemMoved write FOnItemMoved; |
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event is called after drag-and-drop for moved item
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property OnItemObjectDefined: TTVItemObjectDefinedEvent read FOnItemObjectDefined write FOnItemObjectDefined; |
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event is called when new node is created and NodeObject is defined
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property LoadDataDelay: cardinal read FLoadDataDelay write FLoadDataDelay default 0; |
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define delay before Masterdatasource scroll and loading to treeview
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