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(*
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* IBX For Lazarus (Firebird Express)
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*
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* The contents of this file are subject to the Initial Developer's
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* Public License Version 1.0 (the "License"); you may not use this
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* file except in compliance with the License. You may obtain a copy
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* of the License here:
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*
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* http://www.firebirdsql.org/index.php?op=doc&id=idpl
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Initial Developer of the Original Code is Tony Whyman.
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*
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* The Original Code is (C) 2011 Tony Whyman, MWA Software
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* (http://www.mwasoftware.co.uk).
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*
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* All Rights Reserved.
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*
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* Contributor(s): ______________________________________.
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*
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*)
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unit dbFieldLinkPropEditor;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, StdCtrls,
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ExtCtrls, PropEdits, DB;
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type
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{TFieldLinkProperty}
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TFieldLinkProperty = class(TStringProperty)
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private
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FDataSet: TDataSet;
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protected
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function GetDataSet: TDataSet;
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function GetIndexDefs: TIndexDefs; virtual;
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function GetIndexFieldNames: string; virtual; abstract;
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function GetMasterFields: string; virtual; abstract;
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procedure SetIndexFieldNames(const Value: string); virtual; abstract;
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procedure SetMasterFields(const Value: string); virtual; abstract;
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public
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procedure Edit; override;
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function GetAttributes: TPropertyAttributes; override;
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property DataSet: TDataSet read GetDataSet;
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property IndexDefs: TIndexDefs read GetIndexDefs;
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property DetailIndexFieldNames: string read GetIndexFieldNames write SetIndexFieldNames;
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property MasterIndexFieldNames: string read GetMasterFields write SetMasterFields;
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end;
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{ TFieldLinkEditor }
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TFieldLinkEditor = class(TForm)
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Bevel1: TBevel;
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Button1: TButton;
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OKButton: TButton;
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JoinButton: TButton;
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DeleteButton: TButton;
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JoinHint: TLabel;
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Label2: TLabel;
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Label3: TLabel;
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Label4: TLabel;
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DetailedFieldListBox: TListBox;
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JoinedFields: TListBox;
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MasterFieldListBox: TListBox;
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procedure DeleteButtonClick(Sender: TObject);
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procedure DetailedFieldListBoxSelectionChange(Sender: TObject; User: boolean);
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procedure FormShow(Sender: TObject);
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procedure JoinButtonClick(Sender: TObject);
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procedure JoinedFieldsClick(Sender: TObject);
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procedure MasterFieldListBoxSelectionChange(Sender: TObject; User: boolean);
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private
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{ private declarations }
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FDetailedFieldsList: TStringList;
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FMasterFieldsList: TStringList;
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FChanged: boolean;
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procedure ClearJoinList;
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procedure ExtractNames(List: TStringList; Names: string);
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procedure LoadDetailedFields;
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procedure LoadJoinedFields;
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procedure LoadMasterFields;
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procedure SetButtonState;
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procedure ShowJoins;
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public
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{ public declarations }
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DetailIndexDefs: TIndexDefs;
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DetailIndexFieldNames: string;
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MasterIndexFieldNames: string;
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Master: TDataset;
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IndexDefs: TIndexDefs;
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constructor Create(TheOwner: TComponent); override;
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destructor Destroy; override;
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end;
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var
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FieldLinkEditor: TFieldLinkEditor;
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function EditFieldLink(aMaster: TDataSet; aIndexDefs: TIndexDefs;
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var aDetailIndexFieldNames: string;
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var aMasterIndexFieldNames: string): boolean;
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implementation
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function EditFieldLink(aMaster: TDataSet; aIndexDefs: TIndexDefs;
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var aDetailIndexFieldNames: string; var aMasterIndexFieldNames: string
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): boolean;
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begin
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with TFieldLinkEditor.Create(Application) do
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try
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Master := aMaster;
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IndexDefs := aIndexDefs;
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DetailIndexFieldNames := aDetailIndexFieldNames;
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MasterIndexFieldNames := aMasterIndexFieldNames;
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Result := ShowModal = mrOK;
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if Result then
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begin
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aDetailIndexFieldNames := DetailIndexFieldNames;
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aMasterIndexFieldNames := MasterIndexFieldNames
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end;
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finally
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Free
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end;
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end;
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{$R *.lfm}
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{ TFieldLinkProperty }
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function TFieldLinkProperty.GetIndexDefs: TIndexDefs;
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begin
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Result := nil
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end;
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function TFieldLinkProperty.GetDataSet: TDataSet;
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begin
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if FDataSet = nil then
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FDataSet := TDataSet(GetComponent(0));
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Result := FDataSet;
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end;
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procedure TFieldLinkProperty.Edit;
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var detailedFields, masterFields: string;
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begin
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if not assigned(DataSet.DataSource) or not assigned(DataSet.DataSource.DataSet) then
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raise Exception.Create('No Master Dataset');
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detailedFields := DetailIndexFieldNames;
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masterFields := MasterIndexFieldNames;
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if EditFieldLink(DataSet.DataSource.DataSet,IndexDefs,detailedFields,masterFields) then
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Begin
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DetailIndexFieldNames := detailedFields;
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MasterIndexFieldNames := masterFields;
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Modified
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end;
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end;
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function TFieldLinkProperty.GetAttributes: TPropertyAttributes;
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begin
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Result := [paDialog];
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end;
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{ TFieldLinkEditor }
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procedure TFieldLinkEditor.DeleteButtonClick(Sender: TObject);
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begin
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if (JoinedFields.Items.Count = 0) or
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(DetailIndexFieldNames = '') or
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(MessageDlg('Delete the current Field Bindings?',mtConfirmation,[mbYes,mbNo],0) = mrYes) then
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begin
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ClearJoinList;
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if DetailedFieldListBox.ItemIndex > -1 then
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DetailIndexFieldNames := DetailedFieldListBox.Items[DetailedFieldListBox.ItemIndex]
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else
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DetailIndexFieldNames := '';
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MasterIndexFieldNames := '';
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LoadMasterFields;
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LoadJoinedFields;
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FChanged := true;
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SetButtonState
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end;
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end;
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procedure TFieldLinkEditor.DetailedFieldListBoxSelectionChange(Sender: TObject;
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User: boolean);
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begin
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if (DetailedFieldListBox.ItemIndex > -1) and
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(DetailedFieldListBox.Items[DetailedFieldListBox.ItemIndex] <> DetailIndexFieldNames) then
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DeleteButtonClick(nil)
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end;
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procedure TFieldLinkEditor.FormShow(Sender: TObject);
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begin
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JoinHint.Caption := '';
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LoadDetailedFields;
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LoadMasterFields;
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LoadJoinedFields;
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FChanged := false;
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SetButtonState
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end;
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procedure TFieldLinkEditor.JoinButtonClick(Sender: TObject);
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begin
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FMasterFieldsList.Add(MasterFieldListBox.Items[MasterFieldListBox.ItemIndex]);
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if FMasterFieldsList.Count = FDetailedFieldsList.Count then
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MasterIndexFieldNames := FMasterFieldsList.DelimitedText;
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FChanged := true;
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ShowJoins;
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SetButtonState
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end;
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procedure TFieldLinkEditor.JoinedFieldsClick(Sender: TObject);
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begin
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SetButtonState
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end;
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procedure TFieldLinkEditor.MasterFieldListBoxSelectionChange(Sender: TObject;
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User: boolean);
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begin
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SetButtonState
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end;
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procedure TFieldLinkEditor.ClearJoinList;
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begin
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FDetailedFieldsList.Clear;
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FMasterFieldsList.Clear;
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JoinedFields.Items.Clear;
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end;
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procedure TFieldLinkEditor.ExtractNames(List: TStringList; Names: string);
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var idx: integer;
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begin
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idx := 1;
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List.Clear;
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while idx <= Length(Names) do
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List.Add(ExtractFieldName(Names,idx));
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end;
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procedure TFieldLinkEditor.LoadDetailedFields;
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var
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I: integer;
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begin
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DetailedFieldListBox.Clear;
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IndexDefs.Update;
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for I := 0 to IndexDefs.Count - 1 do
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with IndexDefs[I] do
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if (Options * [ixExpression, ixDescending] = []) and (Fields <> '') then
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DetailedFieldListBox.Items.Add(Fields);
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DetailedFieldListBox.ItemIndex := DetailedFieldListBox.Items.IndexOf(DetailIndexFieldNames)
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end;
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procedure TFieldLinkEditor.LoadJoinedFields;
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begin
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ClearJoinList;
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ExtractNames(FDetailedFieldsList,DetailIndexFieldNames);
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ExtractNames(FMasterFieldsList,MasterIndexFieldNames);
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while FDetailedFieldsList.Count < FMasterFieldsList.Count do
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FMasterFieldsList.Delete(FMasterFieldsList.Count - 1);
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ShowJoins
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end;
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procedure TFieldLinkEditor.LoadMasterFields;
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begin
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MasterFieldListBox.Clear;
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if assigned(Master) then
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Master.GetFieldNames(MasterFieldListBox.Items)
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end;
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procedure TFieldLinkEditor.SetButtonState;
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begin
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DeleteButton.Enabled := JoinedFields.Items.Count > 0;
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JoinButton.Enabled := (DetailedFieldListBox.ItemIndex > -1) and
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(MasterFieldListBox.ItemIndex > -1) and
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(JoinedFields.Items.Count < FDetailedFieldsList.Count);
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if JoinButton.Enabled then
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JoinHint.Caption := Format('Click on the Join Button to bind %s to %s',
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[FDetailedFieldsList[JoinedFields.Items.Count],
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MasterFieldListBox.Items[MasterFieldListBox.ItemIndex]])
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else
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JoinHint.Caption := '';
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OKButton.Enabled := FChanged and (MasterIndexFieldNames <> '');
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end;
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procedure TFieldLinkEditor.ShowJoins;
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var i: integer;
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idx: integer;
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begin
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JoinedFields.Clear;
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for i := 0 to FDetailedFieldsList.Count -1 do
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if i < FMasterFieldsList.Count then
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JoinedFields.Items.Add(FDetailedFieldsList[i] + ' => ' + FMasterFieldsList[i]);
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for i := 0 to FMasterFieldsList.Count - 1 do
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begin
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idx := MasterFieldListBox.Items.IndexOf(FMasterFieldsList[i]);
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if idx > -1 then
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MasterFieldListBox.Items.Delete(idx);
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end;
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end;
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constructor TFieldLinkEditor.Create(TheOwner: TComponent);
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begin
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inherited Create(TheOwner);
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FDetailedFieldsList := TStringList.Create;
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FMasterFieldsList := TStringList.Create;
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FMasterFieldsList.Delimiter := ';';
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FMasterFieldsList.StrictDelimiter := true
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end;
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destructor TFieldLinkEditor.Destroy;
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begin
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ClearJoinList;
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if assigned(FDetailedFieldsList) then
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FDetailedFieldsList.Free;
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if assigned(FMasterFieldsList) then
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FMasterFieldsList.Free;
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inherited Destroy;
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end;
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end.
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