mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-04-16 23:49:28 +02:00
LCL, patch for the lookup controls implementing the changing of the key fields of a lookup field, from Leslie Kaye, issue #13396
git-svn-id: trunk@19139 -
This commit is contained in:
jesus
parent
aa41109af3
commit
d72c8f6da9
@ -132,28 +132,32 @@ Type
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FHasLookUpField: Boolean;
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FListLink: TFieldDataLink;
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FListSource: TDataSource;
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FKeyFieldName: string;
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FKeyFieldValue: string;
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FDataFieldNames: string;
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FKeyFieldNames: string;
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FListFieldName: string;
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FListFieldValue: string;
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FListFieldIndex: Integer;
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FKeyField: TField;
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FListField: TField;
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procedure ActiveChange(Sender: TObject);
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FLookUpFieldIsCached: Boolean;
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FDataFields: TList; // Data Fields to lookup/edit
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FKeyFields: TList; // Keyfields in lookup dataset
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FListField: TField; // Result field in lookup dataset
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FLookupCache: boolean;
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FLookupList: TLookupList;
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procedure EditingChange(Sender: TObject);
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procedure FetchLookupData;
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procedure LinkGetBookMark;
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procedure LinkGotoBookMark;
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function GetKeyFieldName: string;
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function GetListSource: TDataSource;
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procedure LinkGetBookMark;
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procedure LinkGotoBookMark;
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procedure SetKeyFieldName(const Value: string);
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procedure SetListSource(Value: TDataSource);
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procedure SetLookupCache(const Value: boolean);
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public
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constructor Create(AOwner: TComponent); override;
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destructor Destroy; override;
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procedure Initialize(AControlDataLink: TFieldDataLink; AControlItems: TStrings);
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function KeyFieldValueOf(const AListFieldValue: string): string;
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function ListFieldValueOf(const AKeyFieldValue: string): string;
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function ListFieldValue: string;
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procedure UpdateData(const AListFieldValue: string);
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property LookupCache: boolean read FLookupCache write SetLookupCache;
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// properties to be published by owner control
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// these are not used where data control Field is dbLookup
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property KeyField: string read GetKeyFieldName write SetKeyFieldName;
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@ -407,10 +411,12 @@ Type
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function GetListField: string;
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function GetListFieldIndex: Integer;
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function GetListSource: TDataSource;
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function GetLookupCache: boolean;
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procedure SetKeyField(const Value: string);
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procedure SetListField(const Value: string);
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procedure SetListFieldIndex(const Value: Integer);
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procedure SetListSource(const Value: TDataSource);
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procedure SetLookupCache(const Value: boolean);
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protected
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procedure DataChange(Sender: TObject); override;
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procedure Loaded; override;
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@ -432,6 +438,7 @@ Type
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property ListField: string read GetListField write SetListField;
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property ListFieldIndex: Integer read GetListFieldIndex write SetListFieldIndex;
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property ListSource: TDataSource read GetListSource write SetListSource;
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property LookupCache: boolean read GetLookupCache write SetLookupCache;
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// property MultiSelect;
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property OnClick;
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property OnDblClick;
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@ -709,10 +716,12 @@ Type
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function GetListField: string;
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function GetListFieldIndex: Integer;
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function GetListSource: TDataSource;
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function GetLookupCache: boolean;
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procedure SetKeyField(const Value: string);
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procedure SetListField(const Value: string);
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procedure SetListFieldIndex(const Value: Integer);
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procedure SetListSource(const Value: TDataSource);
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procedure SetLookupCache(const Value: boolean);
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protected
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procedure Loaded; override;
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procedure UpdateData(Sender: TObject); override;
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@ -740,6 +749,7 @@ Type
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property ListField: string read GetListField write SetListField;
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property ListFieldIndex: Integer read GetListFieldIndex write SetListFieldIndex;
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property ListSource: TDataSource read GetListSource write SetListSource;
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property LookupCache: boolean read GetLookupCache write SetLookupCache;
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// property MaxLength default -1;
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property OnChange;
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property OnChangeBounds;
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@ -24,30 +24,62 @@
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{ TDBLookup }
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{
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Note:
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TField lookup properties
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KeyFields: Semicolon separate list of Data fields in TField's dataset
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LookupDataSet: The Dataset to search for values
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LookupKeyFields: Semicolon separated list of key field names in LookupDataset
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lookupResultField: Name of the field in the LookupDataset which must be the
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same data type as the TField
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The lookup Value of the TField is the Value of the LookupResultField determined
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by a Locate in the lookupDataSet of the LookupKeyFields based on the Values of
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the KeyFields
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Lookup DataControl properties
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KeyField: Name of the field in the LookupDataset which must be the
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same data type as the TField
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ListSource: The Datasource linking to the lookup dataset
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ListField: The Name of the field in the lookup dataset to list in the control
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Usage
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TDBLookup
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fields:
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FDataFields is the list of fields in the dataset which provide the lookup
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values and can be edited based on the Control's selected item
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If the Control's Datafield is a normal field then the Datafield is pointed
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to by FDataFields[0] and FDataFields.Count is 1.
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If the Control's Datafield is a lookup field then the FDataFields point to
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the field's KeyFields
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FKeyFields is the list of fields in the lookup dataset used
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to locate the lookup result based on the values of the FDataFields
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FKeyFields.Count must equal the FDataFields.Count and the fields be of
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corresponding types
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}
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constructor TDBLookup.Create(AOwner: TComponent);
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begin
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inherited;
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FDataFields := TList.Create;
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FKeyFields := TList.Create;
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FListLink:= TFieldDataLink.Create;
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FListLink.DataSource := TDataSource.Create(Self);
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FListLink.Control := Self;
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FListLink.OnActiveChange:= @ActiveChange;
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FListLink.OnEditingChange:=@EditingChange;
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FHasLookUpField:= False;
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FLookupCache := False;
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end;
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destructor TDBLookup.Destroy;
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begin
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FDataFields.Free;
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FKeyFields.Free;
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FListLink.Free;
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FLookupList.Free;
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inherited Destroy;
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end;
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procedure TDBLookup.ActiveChange(Sender: TObject);
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begin
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if FListLink.Active then
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Initialize(FControlLink, FControlItems)
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else Initialize(nil,nil);
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end;
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procedure TDBLookup.EditingChange(Sender: TObject);
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begin
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if not (FListLink.Editing) then
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@ -60,7 +92,7 @@ begin
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if FHasLookUpField then
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Result:= ''
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else
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Result := FKeyFieldName;
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Result := FKeyFieldNames;
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end;
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function TDBLookup.GetListSource: TDataSource;
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@ -73,7 +105,7 @@ end;
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procedure TDBLookup.SetKeyFieldName(const Value: string);
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begin
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FKeyFieldName:= Value;
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FKeyFieldNames := Value;
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end;
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procedure TDBLookup.SetListSource(Value: TDataSource);
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@ -81,25 +113,11 @@ begin
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FListSource:= Value;
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end;
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procedure TDBLookup.FetchLookupData;
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procedure TDBLookup.SetLookupCache(const Value: boolean);
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begin
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if not Assigned(FControlItems) then
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Exit;
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FControlItems.Clear;
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if (Assigned(FListLink.DataSet) and FListLink.DataSet.Active) then
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begin
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LinkGetBookMark;
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try
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FListLink.DataSet.First;
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while not FListLink.DataSet.EOF do
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begin
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FControlItems.Add(FListField.AsString);
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FListLink.DataSet.Next;
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end;
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finally
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LinkGotoBookMark;
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end;
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end;
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FLookupCache := Value;
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if (Value and not Assigned(FLookupList)) then
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FLookupList := TLookupList.Create;
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end;
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procedure TDBLookup.LinkGetBookMark;
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@ -118,16 +136,49 @@ begin
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end;
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end;
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procedure TDBLookup.FetchLookupData;
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var
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TmpActive: Boolean;
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begin
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if not Assigned(FControlItems) then
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Exit;
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FControlItems.Clear;
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if not (Assigned(FListLink.DataSet) and Assigned(FListField)) then
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Exit;
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TmpActive := FListLink.DataSet.Active;
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if TmpActive then
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LinkGetBookMark
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else
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FListLink.DataSet.Active := True;
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try
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if FLookupCache then
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FLookupList.Clear;
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FListLink.DataSet.First;
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while not FListLink.DataSet.EOF do
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begin
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if (FLookupCache and not FLookUpFieldIsCached) then
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FLookupList.Add(FListLink.DataSet.FieldValues[FKeyFieldNames],
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FListField.Value);
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FControlItems.Add(FListField.AsString);
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FListLink.DataSet.Next;
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end;
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finally
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if TmpActive then
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LinkGotoBookMark
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else
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FListLink.DataSet.Active := False;
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end;
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end;
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procedure TDBLookup.Initialize(AControlDataLink: TFieldDataLink; AControlItems: TStrings);
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var
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DataField: TField;
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ListFields: TList;
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TmpActive: Boolean;
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S: string;
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begin
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FKeyField := nil;
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FKeyFieldValue:= '';
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FDataFields.Clear;
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FKeyFields.Clear;
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FListField := nil;
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FListFieldValue:= '';
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if not (Assigned(AControlDataLink) and Assigned(AControlItems)) then
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Exit; // Closing or our DataLink is Active but not the Control's DataLink
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FControlLink:= AControlDataLink;
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@ -139,35 +190,41 @@ begin
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AControlDataLink.FieldName:= '';
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AControlDataLink.FieldName:= S;
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end;
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DataField := AControlDataLink.Field;
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if not Assigned(DataField) then
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if not Assigned(AControlDataLink.Field) then
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Exit;
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// TDBLookupListBox(Owner).Items.Add('Assigned DataField');
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FHasLookUpField:= (DataField.FieldKind = fkLookup);
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FHasLookUpField := (AControlDataLink.Field.FieldKind = fkLookup);
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FLookUpFieldIsCached := (FHasLookupField and AControlDataLink.Field.LookupCache);
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if FHasLookUpField then
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begin
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FListLink.DataSource.DataSet:= DataField.LookupDataSet;
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FKeyFieldName:= DataField.LookupKeyFields;
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FListLink.DataSource.DataSet:= AControlDataLink.Field.LookupDataSet;
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FDataFieldNames := AControlDataLink.Field.KeyFields;
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FKeyFieldNames := AControlDataLink.Field.LookupKeyFields;
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end
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else
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begin
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FListLink.DataSource.DataSet:= FListSource.DataSet;
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if FListLink.Active and (FKeyFieldName <> '') then
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FDataFieldNames := AControlDataLink.Field.FieldName;
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end;
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if (FKeyFieldNames <> '') then
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begin
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ListFields := TList.Create;
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TmpActive := FListLink.DataSet.Active;
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try
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AControlDataLink.DataSet.GetFieldList(FDataFields, FDataFieldNames);
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FListLink.DataSet.Active := True;
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FListLink.DataSet.GetFieldList(ListFields, FListFieldName);
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FListLink.DataSet.GetFieldList(FKeyFields, FKeyFieldNames);
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if FHasLookUpField then
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begin
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FKeyField := FListLink.DataSet.FindField(DataField.LookupResultField);
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if (Assigned(FKeyField) and (ListFields.IndexOf(FKeyField) < 0)) then
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ListFields.Insert(0, FKeyField);
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FListField := FListLink.DataSet.FindField(AControlDataLink.Field.LookupResultField);
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if (Assigned(FListField) and (ListFields.IndexOf(FListField) < 0)) then
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ListFields.Insert(0, FListField);
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if (ListFields.Count > 0) then
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FListField := TField(ListFields[0]);
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end else
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begin
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FKeyField:= FListLink.DataSet.FindField(FKeyFieldName);
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if (Assigned(FKeyField) and (ListFields.Count = 0)) then
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ListFields.Add(FKeyField);
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if ((FKeyFields.Count > 0) and (ListFields.Count = 0)) then
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ListFields.Add(FKeyFields[0]);
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if ((FListFieldIndex >= 0) and (FListFieldIndex < ListFields.Count)) then
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FListField := TField(ListFields[FListFieldIndex]) else
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FListField := TField(ListFields[0]);
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@ -176,51 +233,93 @@ begin
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FListLink.FieldName:= FListField.FieldName;
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finally
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ListFields.Free;
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FListLink.DataSet.Active := TmpActive;
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end;
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FetchLookupData;
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end;
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end;
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function TDBLookup.KeyFieldValueOf(const AListFieldValue: string): string;
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function TDBLookup.ListFieldValue: string;
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var
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Key: Variant;
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TmpActive: Boolean;
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begin
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if (FListFieldValue <> AListFieldValue) then
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Result := '';
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if not ((Assigned(FControlLink) and FControlLink.Active)) then
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Exit;
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Key := FControlLink.DataSet.FieldValues[FDataFieldNames];
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if FHasLookupField then
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begin
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FListFieldValue:= AListFieldValue;
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if FHasLookUpField or (AListFieldValue = '') or not Assigned(FKeyField) then
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FKeyFieldValue := AListFieldValue
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else if (Assigned(FListLink.DataSet) and FListLink.DataSet.Active) then
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begin
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LinkGetBookMark;
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try
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if FListLink.DataSet.Locate(FListFieldName, VarArrayOf([AListFieldValue]), []) then
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FKeyFieldValue := FKeyField.AsString
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else FKeyFieldValue:= '';
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finally
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LinkGotoBookMark;
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end;
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end;
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if (FLookupCache and not FLookUpFieldIsCached) then
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Result := FLookupList.ValueOfKey(Key)
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else
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Result := FControlLink.Field.AsString;
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Exit;
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end;
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if FLookupCache then
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begin
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Result := FLookupList.ValueOfKey(Key);
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Exit;
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end;
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TmpActive := FListLink.DataSet.Active;
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if TmpActive then
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LinkGetBookMark
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else
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FListLink.DataSet.Active := True;
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try
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if FListLink.DataSet.Locate(FKeyFieldNames,
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FControlLink.DataSet.FieldValues[FDataFieldNames], []) then
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Result := FListField.AsString
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else Result:= '';
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finally
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if TmpActive then
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LinkGotoBookMark
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else
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FListLink.DataSet.Active := False;
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end;
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Result := FKeyFieldValue;
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end;
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function TDBLookup.ListFieldValueOf(const AKeyFieldValue: string): string;
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procedure TDBLookup.UpdateData(const AListFieldValue: string);
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var
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I: Integer;
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TmpActive: Boolean;
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Key: Variant;
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begin
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if (FKeyFieldValue <> AKeyFieldValue) then
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if AListFieldValue = FControlLink.Field.AsString then
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Exit;
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if FLookupCache and not FLookupFieldIsCached then
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begin
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FKeyFieldValue:= AKeyFieldValue;
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if FHasLookUpField or (AKeyFieldValue = '') or not Assigned(FKeyField) then
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FListFieldValue := AKeyFieldValue
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else if (Assigned(FListLink.DataSet) and FListLink.DataSet.Active) then
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Key := FLookupList.FirstKeyByValue(AListFieldValue);
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if not VarIsNull(Key) then
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begin
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LinkGetBookMark;
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try
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if FListLink.DataSet.Locate(FKeyFieldName, VarArrayOf([AKeyFieldValue]), []) then
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FListFieldValue := FListField.AsString
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else FListFieldValue:= '';
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finally
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LinkGotoBookMark;
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end;
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FControlLink.DataSet.Edit;
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for I := 0 to FDataFields.Count -1 do
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TField(FDataFields[I]).Value := Key[I];
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if FHasLookupField then
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FControlLink.Field.AsString := AListFieldValue;
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end;
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Exit;
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end;
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if not (Assigned(FListLink.DataSet) and Assigned(FListField)) then
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Exit;
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TmpActive := FListLink.DataSet.Active;
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if TmpActive then
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LinkGetBookMark
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else
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FListLink.DataSet.Active := True;
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try
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if FListLink.DataSet.Locate(FListField.FieldName, VarArrayOf([AListFieldValue]), []) then
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begin
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FControlLink.DataSet.Edit;
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for I := 0 to FDataFields.Count -1 do
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TField(FDataFields[I]).Value := TField(FKeyFields[I]).Value;
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if FHasLookupField then
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FControlLink.Field.AsString := AListFieldValue;
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end;
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finally
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if TmpActive then
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LinkGotoBookMark
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else
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FListLink.DataSet.Active := False;
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end;
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Result := FListFieldValue;
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end;
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@ -39,7 +39,7 @@ end;
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procedure TDBLookupComboBox.UpdateData(Sender: TObject);
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begin
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FDataLink.Field.AsString:= FLookup.KeyFieldValueOf(Text);
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FLookup.UpdateData(Text);
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end;
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procedure TDBLookupComboBox.ActiveChange(Sender: TObject);
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@ -52,10 +52,7 @@ end;
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procedure TDBLookupComboBox.UpdateText;
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begin
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if Assigned(FDataLink.Field) then
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Text:= FLookup.ListFieldValueOf(FDataLink.Field.AsString)
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else
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inherited UpdateText;
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Text:= FLookup.ListFieldValue;
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end;
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function TDBLookupComboBox.GetKeyField: string;
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@ -78,6 +75,11 @@ begin
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Result := FLookup.ListSource;
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end;
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function TDBLookupComboBox.GetLookupCache: boolean;
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begin
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Result := FLookup.LookupCache;
|
||||
end;
|
||||
|
||||
procedure TDBLookupComboBox.SetKeyField(const Value: string);
|
||||
begin
|
||||
FLookup.KeyField:= Value;
|
||||
@ -98,3 +100,8 @@ begin
|
||||
FLookup.ListSource:= Value;
|
||||
end;
|
||||
|
||||
procedure TDBLookupComboBox.SetLookupCache(const Value: boolean);
|
||||
begin
|
||||
FLookup.LookupCache := Value;
|
||||
end;
|
||||
|
||||
|
||||
@ -41,7 +41,7 @@ procedure TDBLookupListBox.UpdateData(Sender: TObject);
|
||||
begin
|
||||
if (ItemIndex < 0) then
|
||||
Exit;
|
||||
FDataLink.Field.AsString:= FLookup.KeyFieldValueOf(Items[ItemIndex]);
|
||||
FLookup.UpdateData(Items[ItemIndex]);
|
||||
end;
|
||||
|
||||
procedure TDBLookupListBox.ActiveChange(Sender: TObject);
|
||||
@ -56,10 +56,7 @@ end;
|
||||
|
||||
procedure TDBLookupListBox.DataChange(Sender: TObject);
|
||||
begin
|
||||
if Assigned(FDataLink.Field) then
|
||||
ItemIndex:= Items.IndexOf(FLookup.ListFieldValueOf(FDataLink.Field.AsString))
|
||||
else
|
||||
ItemIndex:= -1;
|
||||
ItemIndex:= Items.IndexOf(FLookup.ListFieldValue);
|
||||
end;
|
||||
|
||||
function TDBLookupListBox.GetKeyField: string;
|
||||
@ -82,6 +79,11 @@ begin
|
||||
Result := FLookup.ListSource;
|
||||
end;
|
||||
|
||||
function TDBLookupListBox.GetLookupCache: boolean;
|
||||
begin
|
||||
Result := FLookup.LookupCache;
|
||||
end;
|
||||
|
||||
procedure TDBLookupListBox.SetKeyField(const Value: string);
|
||||
begin
|
||||
FLookup.KeyField:= Value;
|
||||
@ -102,3 +104,8 @@ begin
|
||||
FLookup.ListSource:= Value;
|
||||
end;
|
||||
|
||||
procedure TDBLookupListBox.SetLookupCache(const Value: boolean);
|
||||
begin
|
||||
FLookup.LookupCache := Value;
|
||||
end;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user