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root/public/ibx/trunk/ibcontrols/IBLookupComboEditBox.pas

Comparing ibx/trunk/ibcontrols/IBLookupComboEditBox.pas (file contents):
Revision 31 by tony, Tue Jul 14 15:31:25 2015 UTC vs.
Revision 311 by tony, Mon Aug 24 09:32:58 2020 UTC

#	Line 30 | Line 30 | unit IBLookupComboEditBox;
30		interface
31
32		uses
33	<	Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs, DbCtrls,
34	<	ExtCtrls, IBSQLParser, DB, StdCtrls, IBCustomDataSet;
33	>	Classes, SysUtils, LCLType, LResources, Forms, Controls, Graphics, Dialogs, DbCtrls,
34	>	ExtCtrls, IBSQLParser, DB, StdCtrls, IBCustomDataSet, LCLVersion;
35
36		type
37
#	Line 54 | Line 54 | type
54		FOwner: TIBLookupComboEditBox;
55		protected
56		procedure ActiveChanged; override;
57	+	{$if lcl_fullversion < 2000000}
58	+	procedure DataEvent(Event: TDataEvent; Info: Ptrint); override;
59	+	{$endif}
60		procedure RecordChanged(Field: TField); override;
61		procedure UpdateData; override;
62		public
#	Line 76 | Line 79 | type
79
80		TIBLookupComboEditBox = class(TDBLookupComboBox)
81		private
79	–	FCanAutoInsert: TCanAutoInsert;
82		{ Private declarations }
83		FDataLink: TIBLookupComboDataLink;
84		FIBLookupControlLink: TIBLookupControlLink;
#	Line 92 | Line 94 | type
94		FUpdating: boolean;
95		FInserting: boolean;
96		FExiting: boolean;
97	+	FForceAutoComplete: boolean;
98	+	FInCheckAndInsert: boolean;
99		FLastKeyValue: variant;
100	+	FCurText: string;
101	+	FModified: boolean;
102		procedure DoActiveChanged(Data: PtrInt);
103		function GetAutoCompleteText: TComboBoxAutoCompleteText;
104		function GetListSource: TDataSource;
#	Line 107 | Line 113 | type
113		procedure UpdateSQL(Sender: TObject; Parser: TSelectSQLParser);
114		procedure HandleEnter(Data: PtrInt);
115		procedure UpdateLinkData(Sender: TObject);
116	+	procedure ValidateListField;
117		protected
118		{ Protected declarations }
119		procedure ActiveChanged(Sender: TObject);
120		procedure CheckAndInsert;
121		procedure DoEnter; override;
122		procedure DoExit; override;
123	+	{$if lcl_fullversion >= 2000002}
124	+	{Deferred update changes in Lazarus 2.0 stop the combo box working when
125	+	the datasource is nil. We thus have to reverse out the changes :(}
126	+	function DoEdit: boolean; override;
127	+	procedure Change; override;
128	+	procedure CloseUp; override;
129	+	procedure Select; override;
130	+	{$ifend}
131	+	{$if lcl_fullversion = 2000002}
132	+	procedure UTF8KeyPress(var UTF8Key: TUTF8Char); override;
133	+	{$ifend}
134		procedure KeyUp(var Key: Word; Shift: TShiftState); override;
135		procedure Loaded; override;
136		procedure Notification(AComponent: TComponent; Operation: TOperation); override;
137		procedure SetItemIndex(const Val: integer); override;
120	–	function SQLSafe(aText: string): string;
138		procedure UpdateShowing; override;
139	<
139	>	procedure UpdateData(Sender: TObject); override;
140		public
141		{ Public declarations }
142		constructor Create(TheComponent: TComponent); override;
#	Line 143 | Line 160 | type
160
161		implementation
162
163	<	uses IBQuery, LCLType, Variants, LCLProc;
163	>	uses Variants, LCLProc, LazUTF8, IBUtils, IBMessages;
164
165		{ TIBLookupControlLink }
166
#	Line 165 | Line 182 | begin
182		FOwner.ActiveChanged(self)
183		end;
184
185	+	{$if lcl_fullversion < 2000000}
186	+	procedure TIBLookupComboDataLink.DataEvent(Event: TDataEvent; Info: Ptrint);
187	+	begin
188	+	inherited DataEvent(Event, Info);
189	+	if Event = deLayoutChange then
190	+	FOwner.LookupCache := FOwner.LookupCache; {sneaky way of calling UpdateLookup}
191	+	end;
192	+	{$endif}
193	+
194		procedure TIBLookupComboDataLink.RecordChanged(Field: TField);
195		begin
196		FOwner.RecordChanged(self,Field);
#	Line 184 | Line 210 | end;
210		{ TIBLookupComboEditBox }
211
212		procedure TIBLookupComboEditBox.HandleTimer(Sender: TObject);
187	–	var ActiveState: boolean;
213		begin
214		FTimer.Interval := 0;
215		FFiltered := Text <> '';
#	Line 227 | Line 252 | begin
252		and ListSource.DataSet.Active   then
253		begin
254		begin
255	+	ValidateListField;
256		if varIsNull(FLastKeyValue) and (ItemIndex = -1) then
257		KeyValue := ListSource.DataSet.FieldByName(KeyField).AsVariant
258		else
#	Line 313 | Line 339 | procedure TIBLookupComboEditBox.UpdateLi
339		var
340		iSelStart: Integer; // char position
341		sCompleteText, sPrefixText, sResultText: string;
316	–	curText: string;
342		begin
343		if assigned(ListSource) and assigned(ListSource.DataSet) and (ListSource.DataSet is TIBCustomDataSet)
344		and ListSource.DataSet.Active then
345		begin
346	+	FCurText := Text;
347		FUpdating := true;
348		try
349		iSelStart := SelStart;//Capture original cursor position
350		if ((iSelStart < UTF8Length(Text)) and
351		(cbactEndOfLineComplete in AutoCompleteText)) then
352		Exit;
327	–	curText := Text;
353		sPrefixText := UTF8Copy(Text, 1, iSelStart);
354		ListSource.DataSet.Active := false;
355		ListSource.DataSet.Active :=  true;
356	<	Text := curText;
357	<	if not FExiting and Focused and (Text <> '')then
356	>	Text := FCurText;
357	>	if not FExiting and (FForceAutoComplete or Focused) and (FCurText <> '')then
358		begin
359		if ListSource.DataSet.Active and (ListSource.DataSet.RecordCount > 0) then
360		begin
361		sCompleteText := ListSource.DataSet.FieldByName(ListField).AsString;
362	<	if (sCompleteText <> Text) then
362	>	if (sCompleteText <> FCurText) then
363		begin
364	+	KeyValue := ListSource.DataSet.FieldByName(KeyField).AsVariant;
365		sResultText := sCompleteText;
366		if ((cbactEndOfLineComplete in AutoCompleteText) and
367		(cbactRetainPrefixCase in AutoCompleteText)) then
#	Line 344 | Line 370 | begin
370		UTF8Insert(sPrefixText, sResultText, 1);
371		end;
372		Text := sResultText;
347	–	SelStart := iSelStart;
348	–	SelLength := UTF8Length(Text);
373		end;
374	<	KeyValue := ListSource.DataSet.FieldByName(KeyField).AsVariant;
374	>	SelStart := iSelStart;
375	>	SelLength := UTF8Length(Text) - iSelStart;
376	>	end
377	>	else
378	>	begin
379	>	SelStart := iSelStart;
380	>	SelLength := 0;
381		end;
382		end;
383		finally
384		FUpdating := false
385		end;
386	+	FModified := true;
387		end;
388		end;
389
390		procedure TIBLookupComboEditBox.UpdateSQL(Sender: TObject;
391		Parser: TSelectSQLParser);
392		var FieldPosition: integer;
393	+	FilterText: string;
394	+	SQLDialect: integer;
395		begin
396		if FFiltered then
397		begin
398	+	if FUpdating then
399	+	FilterText := FCurText
400	+	else
401	+	FilterText := Text;
402	+
403	+	if Parser.DataSet <> nil then
404	+	SQLDialect := (Parser.DataSet as TIBCustomDataSet).Database.SQLDialect
405	+	else
406	+	SQLDialect := 1;
407	+
408		if cbactSearchCaseSensitive in AutoCompleteText then
409	<	Parser.Add2WhereClause(GetRelationNameQualifier + '"' + ListField + '" Like ''' +
410	<	SQLSafe(Text) + '%''')
409	>	Parser.Add2WhereClause(GetRelationNameQualifier + QuoteIdentifierIfNeeded(SQLDialect,ListField) + ' Like ''' +
410	>	SQLSafeString(FilterText) + '%''')
411		else
412	<	Parser.Add2WhereClause(GetRelationNameQualifier + 'Upper("' + ListField + '") Like Upper(''' +
413	<	SQLSafe(Text) + '%'')');
412	>	Parser.Add2WhereClause('Upper(' + GetRelationNameQualifier + QuoteIdentifierIfNeeded(SQLDialect,ListField) + ') Like Upper(''' +
413	>	SQLSafeString(FilterText) + '%'')');
414
415	<	end;
416	<	if cbactSearchAscending in AutoCompleteText then
417	<	begin
418	<	FieldPosition := Parser.GetFieldPosition(ListField);
376	<	if FieldPosition = 0 then Exit;
415	>	if cbactSearchAscending in AutoCompleteText then
416	>	begin
417	>	FieldPosition := Parser.GetFieldPosition(ListField);
418	>	if FieldPosition = 0 then Exit;
419
420	<	Parser.OrderByClause := IntToStr(FieldPosition) + ' ascending';
420	>	Parser.OrderByClause := IntToStr(FieldPosition) + ' ascending';
421	>	end;
422		end;
423		end;
424
#	Line 391 | Line 434 | begin
434		ListSource.DataSet.FieldByName(ListField).AsString := Text
435		end;
436
437	+	{Check to ensure that ListField exists and convert to upper case if necessary}
438	+
439	+	procedure TIBLookupComboEditBox.ValidateListField;
440	+	var SQLDialect: integer;
441	+	FieldNames: TStringList;
442	+	begin
443	+	if (ListSource = nil) or (ListSource.DataSet = nil) or
444	+	not (ListSource.DataSet is TIBCustomDataSet) or
445	+	((ListSource.DataSet as TIBCustomDataSet).Database = nil) then Exit;
446	+	SQLDialect := (ListSource.DataSet as TIBCustomDataSet).Database.SQLDialect;
447	+	FieldNames := TStringList.Create;
448	+	try
449	+	FieldNames.CaseSensitive := true;
450	+	FieldNames.Sorted := true;
451	+	FieldNames.Duplicates := dupError;
452	+	ListSource.DataSet.GetFieldNames(FieldNames);
453	+	if FieldNames.IndexOf(ListField) = -1 then {not found}
454	+	begin
455	+	if (SQLDialect = 3) and (FieldNames.IndexOf(AnsiUpperCase(ListField)) <> - 1) then {normalise to upper case}
456	+	ListField := AnsiUpperCase(ListField)
457	+	else
458	+	IBError(ibxeListFieldNotFound,[ListField])
459	+	end;
460	+	finally
461	+	FieldNames.Free;
462	+	end;
463	+	end;
464	+
465		procedure TIBLookupComboEditBox.CheckAndInsert;
466		var Accept: boolean;
467		NewKeyValue: variant;
468		begin
469	<	if AutoInsert and (Text <> '') and assigned(ListSource) and assigned(ListSource.DataSet)
470	<	and ListSource.DataSet.Active and (ListSource.DataSet.RecordCount = 0) then
469	>	if FInCheckAndInsert then Exit;
470	>	FInCheckAndInsert := true;
471		try
472	<	{Is it OK to insert a new list member?}
473	<	Accept := true;
474	<	if assigned(FOnCanAutoInsert) then
475	<	OnCanAutoInsert(self,Text,Accept);
476	<	if not Accept then
477	<	begin
478	<	ResetParser;
479	<	Text := FOriginalTextValue;
480	<	SelectAll;
481	<	Exit;
482	<	end;
472	>	if AutoInsert and (Text <> '') and assigned(ListSource) and assigned(ListSource.DataSet)
473	>	and ListSource.DataSet.Active and (ListSource.DataSet.RecordCount = 0) then
474	>	try
475	>	{Is it OK to insert a new list member?}
476	>	Accept := true;
477	>	if assigned(FOnCanAutoInsert) then
478	>	OnCanAutoInsert(self,Text,Accept);
479	>	if not Accept then
480	>	begin
481	>	ResetParser;
482	>	Text := FOriginalTextValue;
483	>	SelectAll;
484	>	Exit;
485	>	end;
486
487	<	FInserting := true;
488	<	try
489	<	{New Value}
490	<	FFiltered := false;
491	<	if assigned(FOnAutoInsert) then
492	<	begin
493	<	{In an OnAutoInsert handler, the client is expected to insert the new
494	<	row into the List DataSet and to set the KeyValue property to the
495	<	value of the primary key of the new row.}
496	<	OnAutoInsert(self,Text,NewKeyValue);
497	<	end
498	<	else
499	<	begin
500	<	ListSource.DataSet.Append;
501	<	{The new KeyValue should be determined by an external generator or
502	<	in the "OnInsert" handler. If it is the same as the ListField, then
503	<	it will be set from the UpdateLinkData method}
504	<	try
505	<	ListSource.DataSet.Post;
506	<	except
507	<	ListSource.DataSet.Cancel;
508	<	raise;
509	<	end;
510	<	NewKeyValue := ListSource.DataSet.FieldByName(KeyField).AsVariant;
511	<	end;
512	<	Text := ''; {Ensure full list}
513	<	UpdateList;
514	<	KeyValue := NewKeyValue;
515	<	UpdateData(nil); {Force sync with DataField}
516	<	finally
517	<	FInserting := false
518	<	end;
519	<	except
520	<	Text := FOriginalTextValue;
521	<	ResetParser;
522	<	raise;
487	>	FInserting := true;
488	>	try
489	>	{New Value}
490	>	FFiltered := false;
491	>	if assigned(FOnAutoInsert) then
492	>	begin
493	>	{In an OnAutoInsert handler, the client is expected to insert the new
494	>	row into the List DataSet and to set the KeyValue property to the
495	>	value of the primary key of the new row.}
496	>	OnAutoInsert(self,Text,NewKeyValue);
497	>	end
498	>	else
499	>	begin
500	>	ListSource.DataSet.Append;
501	>	{The new KeyValue should be determined by an external generator or
502	>	in the "OnInsert" handler. If it is the same as the ListField, then
503	>	it will be set from the UpdateLinkData method}
504	>	try
505	>	ListSource.DataSet.Post;
506	>	except
507	>	ListSource.DataSet.Cancel;
508	>	raise;
509	>	end;
510	>	NewKeyValue := ListSource.DataSet.FieldByName(KeyField).AsVariant;
511	>	end;
512	>	Text := ''; {Ensure full list}
513	>	UpdateList;
514	>	KeyValue := NewKeyValue;
515	>	UpdateData(nil); {Force sync with DataField}
516	>	finally
517	>	FInserting := false
518	>	end;
519	>	except
520	>	Text := FOriginalTextValue;
521	>	ResetParser;
522	>	raise;
523	>	end;
524	>	finally
525	>	FInCheckAndInsert := false
526		end;
527		end;
528
#	Line 475 | Line 552 | end;
552		procedure TIBLookupComboEditBox.KeyUp(var Key: Word; Shift: TShiftState);
553		begin
554		inherited KeyUp(Key, Shift);
478	–	if Key = VK_RETURN then
479	–	EditingDone
480	–	else
555		if Key = VK_ESCAPE then
556		begin
557		SelStart := UTF8Length(Text);      {Ensure end of line selection}
#	Line 486 | Line 560 | begin
560		SelectAll;
561		end
562		else
563	<	if (IsEditableTextKey(Key) or (Key = VK_BACK))
564	<	and AutoComplete and (Style <> csDropDownList) and
565	<	(not (cbactEndOfLineComplete in AutoCompleteText) or (SelStart = UTF8Length(Text))) then
566	<	FTimer.Interval := FKeyPressInterval
567	<	else
568	<	FTimer.Interval := 0;
563	>	if AutoComplete and (Style <> csDropDownList) then
564	>	begin
565	>	if (Key = VK_BACK) or (Key = VK_DELETE) then
566	>	begin
567	>	if SelStart = 0 then
568	>	begin
569	>	SelStart := UTF8Length(Text);
570	>	SelLength := 0;
571	>	end;
572	>	FTimer.Interval := 0;
573	>	end
574	>	else
575	>	if IsEditableTextKey(Key) and
576	>	(not(cbactEndOfLineComplete in AutoCompleteText) or (SelStart = UTF8Length(Text))) then
577	>	begin
578	>	FTimer.Interval := 0;
579	>	FTimer.Interval := FKeyPressInterval;
580	>	end;
581	>	end;
582		end;
583
584		procedure TIBLookupComboEditBox.Loaded;
#	Line 510 | Line 597 | end;
597
598		procedure TIBLookupComboEditBox.SetItemIndex(const Val: integer);
599		begin
600	+	if Val > 0 then
601	+	FCurText := '';
602		inherited SetItemIndex(Val);
603		FLastKeyValue := KeyValue;
604		end;
605
517	–	function TIBLookupComboEditBox.SQLSafe(aText: string): string;
518	–	var I: integer;
519	–	begin
520	–	Result := '';
521	–	for I := 1 to length(aText) do
522	–	if aText[I] = '''' then
523	–	Result := Result + ''''''
524	–	else
525	–	Result := Result + aText[I];
526	–	end;
527	–
606		procedure TIBLookupComboEditBox.UpdateShowing;
607		begin
608		inherited UpdateShowing;
#	Line 532 | Line 610 | begin
610		ActiveChanged(nil);
611		end;
612
613	+	procedure TIBLookupComboEditBox.UpdateData(Sender: TObject);
614	+	begin
615	+	inherited UpdateData(Sender);
616	+	if FCurText <> '' then
617	+	Text := FCurText + Text;
618	+	FModified := false;
619	+	end;
620	+
621	+
622	+	{Workarounds due to bugs in various Lazarus 2.0 release candidates}
623	+	{$if lcl_fullversion >= 2000002}
624	+	type
625	+
626	+	{ THackedCustomComboBox }
627	+
628	+	THackedCustomComboBox = class(TCustomComboBox)
629	+	private
630	+	procedure CallChange;
631	+	procedure CallUTF8KeyPress(var UTF8Key: TUTF8Char);
632	+	end;
633	+
634	+	{ THackedCustomComboBox }
635	+
636	+	procedure THackedCustomComboBox.CallChange;
637	+	begin
638	+	inherited Change;
639	+	end;
640	+
641	+	procedure THackedCustomComboBox.CallUTF8KeyPress(var UTF8Key: TUTF8Char);
642	+	begin
643	+	inherited UTF8KeyPress(UTF8Key);
644	+	end;
645	+
646	+	procedure TIBLookupComboEditBox.Change;
647	+	begin
648	+	if DataSource = nil then
649	+	THackedCustomComboBox(self).CallChange
650	+	else
651	+	inherited Change;
652	+	end;
653	+
654	+	procedure TIBLookupComboEditBox.CloseUp;
655	+	begin
656	+	inherited DoEdit;
657	+	inherited CloseUp;
658	+	EditingDone;
659	+	end;
660	+
661	+	procedure TIBLookupComboEditBox.Select;
662	+	begin
663	+	inherited Select;
664	+	if DataSource = nil then
665	+	inherited DoEdit;
666	+	end;
667	+
668	+	function TIBLookupComboEditBox.DoEdit: boolean;
669	+	begin
670	+	{DoEdit will swallow characters if no editable Field. Hence, to enabled
671	+	writing we must avoid calling the inherited method.}
672	+	if DataSource = nil then
673	+	Result := true
674	+	else
675	+	Result := inherited DoEdit;
676	+	end;
677	+	{$ifend}
678	+
679	+	{$if lcl_fullversion = 2000002}
680	+	procedure TIBLookupComboEditBox.UTF8KeyPress(var UTF8Key: TUTF8Char);
681	+	begin
682	+	if DataSource = nil then
683	+	THackedCustomComboBox(self).CallUTF8KeyPress(UTF8Key)
684	+	else
685	+	inherited;
686	+	end;
687	+	{$ifend}
688	+
689	+
690		constructor TIBLookupComboEditBox.Create(TheComponent: TComponent);
691		begin
692		inherited Create(TheComponent);
#	Line 550 | Line 705 | begin
705		if assigned(FDataLink) then FDataLink.Free;
706		if assigned(FIBLookupControlLink) then FIBLookupControlLink.Free;
707		if assigned(FTimer) then FTimer.Free;
708	+	Application.RemoveAsyncCalls(self);
709		inherited Destroy;
710		end;
711
712		procedure TIBLookupComboEditBox.EditingDone;
713		begin
714	+	FForceAutoComplete := true;
715	+	try
716	+	if FTimer.Interval <> 0 then
717	+	HandleTimer(nil);
718	+	finally
719	+	FForceAutoComplete := false;
720	+	end;
721		CheckAndInsert;
722	+	FCurText := '';
723	+	if FModified then
724	+	Change; {ensure Update}
725		inherited EditingDone;
726		end;
727

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