summaryrefslogtreecommitdiff
path: root/src/gui/fpg_editcombo.pas
blob: 8d6606647afe30f81dbcaffcef0f440a9177e01b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
{
    fpGUI  -  Free Pascal GUI Toolkit

    Copyright (C) 2006 - 2008 See the file AUTHORS.txt, included in this
    distribution, for details of the copyright.

    See the file COPYING.modifiedLGPL, included in this distribution,
    for details about redistributing fpGUI.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

    Description:
      Defines a edit ComboBox control with auto-complete feature.
}

unit fpg_editcombo;

{$mode objfpc}{$H+}

{.$Define DEBUG}

{
    ***********************************************************
    **********   This is still under development!   ***********
    ***********************************************************

    It needs lots of testing and debugging.
}


{ TODO: Needs a lot of refactoring to get rid of code duplication. }

{
This is an example of what we can aim for:
You need a mono font to see the correct layout.


               TfpgBaseComboBox
              _________|______________
             |                        |
   TfpgBaseStaticCombo        TfpgBaseEditCombo
       ______|_________               |
      |                |         TfpgEditCombo
      |                |
 TfpgComboBox   TfpgBaseColorCombo
                       |
                 TfpgColorComboBox
}

interface

uses
  Classes,
  SysUtils,
  fpg_base,
  fpg_main,
  fpg_widget,
  fpg_popupwindow,
  fpg_combobox;

type
  TAllowNew = (anNo, anYes, anAsk);


  { TfpgBaseEditCombo }

  TfpgBaseEditCombo = class(TfpgBaseComboBox)
  private
    FAutoCompletion: Boolean;
    FAllowNew: TAllowNew;
    FText: string;
    FSelectedItem: integer;
    FMaxLength: integer;
    FNewItem: boolean;
    procedure   SetAllowNew(const AValue: TAllowNew);
    procedure   InternalBtnClick(Sender: TObject);
    procedure   InternalListBoxSelect(Sender: TObject);
    procedure   InternalListBoxKeyPress(Sender: TObject; var keycode: word; var shiftstate: TShiftState;
                var consumed: Boolean);
  protected
    FDropDown: TfpgPopupWindow;
    FDrawOffset: integer;
    FSelStart: integer;
    FSelOffset: integer;
    FCursorPos: integer;
    procedure   DoDropDown; override;
    function    GetText: string; virtual;
    function    HasText: boolean; virtual;
    procedure   SetText(const AValue: string); virtual;
    procedure   HandleResize(AWidth, AHeight: TfpgCoord); override;
    procedure   HandleKeyChar(var AText: TfpgChar; var shiftstate: TShiftState; var consumed: Boolean); override;
    procedure   HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: Boolean); override;
    procedure   HandleLMouseDown(x, y: integer; shiftstate: TShiftState); override;
    procedure   HandleLMouseUp(x, y: integer; shiftstate: TShiftState); override;
    procedure   HandlePaint; override;
    property    AutoCompletion: Boolean read FAutocompletion write FAutoCompletion default False;
    property    AllowNew: TAllowNew read FAllowNew write SetAllowNew default anNo;
    property    BackgroundColor default clBoxColor;
    property    TextColor default clText1;
    property    Text: string read GetText write SetText;
  public
    constructor Create(AOwner: TComponent); override;
    destructor  Destroy; override;
    procedure   Clear;
    procedure   SetFocus;
    procedure   Update;
    property    NewText: boolean read FNewItem;
  end;


  TfpgEditCombo = class(TfpgBaseEditCombo)
  published
    property    AllowNew;
    property    AutoCompletion;
    property    BackgroundColor;
    property    DropDownCount;
    property    ExtraHint;
    property    FocusItem;
    property    FontDesc;
    property    Height;
    property    Items;
    property    Margin;
    property    Text;
    property    TextColor;
    property    Width;
    property    OnChange;
    property    OnCloseUp;
    property    OnDropDown;
    property    OnEnter;
    property    OnExit;
    property    OnKeyPress;
  end;


function CreateEditCombo(AOwner: TComponent; x, y, w: TfpgCoord; AList:TStringList; ACompletion: boolean = False;
      ANew: TAllowNew = anNo; h: TfpgCoord = 0): TfpgEditCombo;


implementation

uses
  fpg_stringutils,
  fpg_constants,
  fpg_listbox,
  fpg_dialogs;

var
  OriginalFocusRoot: TfpgWidget;

type
  { This is the class representing the dropdown window of the combo box. }
  TDropDownWindow = class(TfpgPopupWindow)
  private
    FCallerWidget: TfpgWidget;
    ListBox:    TfpgListBox;
  protected
    procedure   HandlePaint; override;
    procedure   HandleKeyChar(var AText: TfpgChar; var shiftstate: TShiftState; var consumed: Boolean); override;
    procedure   HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: boolean); override;
    procedure   HandleShow; override;
    procedure   HandleHide; override;
  public
    constructor Create(AOwner: TComponent); override;
    property    CallerWidget: TfpgWidget read FCallerWidget write FCallerWidget;
  end;


{ TDropDownWindow }

procedure TDropDownWindow.HandlePaint;
begin
  Canvas.BeginDraw;
//  inherited HandlePaint;
  Canvas.Clear(clWhite);
  Canvas.EndDraw;
end;

procedure TDropDownWindow.HandleKeyChar(var AText: TfpgChar;
  var shiftstate: TShiftState; var consumed: Boolean);
begin
  if TfpgEditCombo(FCallerWidget).FAutoCompletion then
    TfpgEditCombo(FCallerWidget).HandleKeyChar(AText,shiftstate,consumed);
end;

procedure TDropDownWindow.HandleKeyPress(var keycode: word;
  var shiftstate: TShiftState; var consumed: boolean);
begin
  if TfpgEditCombo(FCallerWidget).FAutoCompletion then
  begin
    TfpgEditCombo(FCallerWidget).HandleKeyPress(keycode,shiftstate,consumed);
//    consumed:= True;
  end
  else
  begin
    inherited HandleKeyPress(keycode, shiftstate, consumed);
    if keycode = keyEscape then
    begin
      consumed := True;
      Close;
    end;
  end;
end;

procedure TDropDownWindow.HandleShow;
begin
  ListBox.SetPosition(0, 0, Width, Height);
  inherited HandleShow;
  ActiveWidget := ListBox;
end;

procedure TDropDownWindow.HandleHide;
begin
  // HandleHide also gets called in TfpgWidget.Destroy so we need a few
  // if Assigned() tests here. This should be improved on.
//  if Assigned(FocusRootWidget) then
//    FocusRootWidget.ReleaseMouse;  // for internal ListBox

  if Assigned(CallerWidget) then
    CallerWidget.SetFocus;
  inherited HandleHide;
end;

constructor TDropDownWindow.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  ListBox := TfpgListBox.Create(self);
  ListBox.PopupFrame := True;
end;

function CreateEditCombo(AOwner: TComponent; x, y, w: TfpgCoord; AList:TStringList; ACompletion: boolean = False;
      ANew: TAllowNew = anNo; h: TfpgCoord = 0): TfpgEditCombo;
begin
  Result           := TfpgEditCombo.Create(AOwner);
  Result.Left      := x;
  Result.Top       := y;
  Result.Width     := w;
  Result.Focusable := True;
  Result.AutoCompletion := ACompletion;
  Result.AllowNew       := ANew;
  if h < TfpgEditCombo(Result).Font.Height + (Result.FMargin * 2) then
    Result.Height := TfpgEditCombo(Result).Font.Height + (Result.FMargin * 2)
  else
    Result.Height:= h;

  if Assigned(AList) then
    Result.Items.Assign(AList);
end;

{ TfpgBaseEditCombo }

procedure TfpgBaseEditCombo.SetAllowNew(const AValue: TAllowNew);
begin
  if FAllowNew <> AValue then
    FAllowNew := AValue;
end;

function TfpgBaseEditCombo.GetText: string;
begin
  if FAutoCompletion then
    Result := FText
  else
    if (FocusItem >= 0) and (FocusItem <= FItems.Count-1) then
      Result := FItems.Strings[FocusItem]
    else
      Result := '';
end;

function TfpgBaseEditCombo.HasText: boolean;
begin
  Result := FFocusItem >= 0;
end;

procedure TfpgBaseEditCombo.DoDropDown;
var
  ddw: TDropDownWindow;
  rowcount, i: integer;
  r: TfpgRect;
begin
  if (not Assigned(FDropDown)) or (not FDropDown.HasHandle) then
  begin
    FreeAndNil(FDropDown);
    OriginalFocusRoot := FocusRootWidget;
    FDropDown := TDropDownWindow.Create(nil);
    ddw := TDropDownWindow(FDropDown);
    ddw.Width := Width;
    ddw.CallerWidget := self;
    ddw.ListBox.OnSelect := @InternalListBoxSelect;
    ddw.ListBox.OnKeyPress := @InternalListBoxKeyPress;

    // Assign combobox text items to internal listbox
    if FAutoCompletion then
    begin
      for i := 0 to FItems.Count-1 do
        if SameText(UTF8Copy(FItems.Strings[i], 1, UTF8Length(FText)), FText) then
          ddw.ListBox.Items.Add(FItems.Strings[i]);
    end
    else
      ddw.ListBox.Items.Assign(FItems);

    // adjust the height of the dropdown
    rowcount := ddw.ListBox.Items.Count;
    if rowcount > DropDownCount then
      rowcount := DropDownCount;
    if rowcount < 1 then
      rowcount := 1;
    ddw.Height := (ddw.ListBox.RowHeight * rowcount) + 4;
    ddw.ListBox.Height := ddw.Height;   // needed in follow focus, otherwise, the default value (80) is used

    // set default focusitem
    ddw.ListBox.FocusItem := FFocusItem;

    ddw.DontCloseWidget := self;  // now we can control when the popup window closes
    r := GetDropDownPos(Parent, self, ddw);
    ddw.Height := r.Height;

    if (FItems.Count > 0) then
      DoOnDropDown;
    ddw.OnClose := @InternalOnClose;

    ddw.ShowAt(Parent, r.Left, r.Top);
  end
  else
  begin
    FBtnPressed := False;
    ddw := TDropDownWindow(FDropDown);
    ddw.Close;
    FreeAndNil(FDropDown);
  end;
end;

procedure TfpgBaseEditCombo.InternalBtnClick(Sender: TObject);
begin
  DoDropDown;
end;

procedure TfpgBaseEditCombo.InternalListBoxSelect(Sender: TObject);
var
  i: Integer;
begin
  for i := 0 to Items.Count-1 do
  begin
    if Items[i]= TDropDownWindow(FDropDown).ListBox.Items[TDropDownWindow(FDropDown).ListBox.FocusItem] then
    begin
      FocusItem := i;
      FSelectedItem:= i;
      FText:= Items[i];
      Break;
    end;
  end;
  FDropDown.Close;
  //Repaint will check if Handle is created
  Repaint;
end;

procedure TfpgBaseEditCombo.InternalListBoxKeyPress(Sender: TObject; var keycode: word;
          var shiftstate: TShiftState; var consumed: Boolean);
var
  i: Integer;
begin
  if ((keycode = keyUp) or (keycode = keyDown)) and (TDropDownWindow(FDropDown).ListBox.FocusItem > -1) then
    for i := 0 to Items.Count-1 do
    begin
      if Items[i]= TDropDownWindow(FDropDown).ListBox.Items[TDropDownWindow(FDropDown).ListBox.FocusItem] then
      begin
        FSelectedItem:= i;
        Break;
      end;
    end;

  //Repaint will check if Handle is created
  Repaint;
end;

procedure TfpgBaseEditCombo.SetText(const AValue: string);
var
  i: integer;
begin
  if AValue = '' then
  begin
    FText:= '';
    FocusItem := -1;  // nothing selected
  end
  else
  begin
    for i := 0 to Items.Count-1 do
    begin
      if SameText(UTF8Copy(Items.Strings[i], 1, UTF8Length(AVAlue)), AValue) then
      begin
        FocusItem := i;
        FText:= AValue;
        Repaint;
        Exit; //==>
      end;
    end;
    // if we get here, we didn't find a match
    FocusItem := -1;
  end;
end;

procedure TfpgBaseEditCombo.HandleResize(AWidth, AHeight: TfpgCoord);
begin
  inherited HandleResize(AWidth, AHeight);
  if FSizeIsDirty then
    CalculateInternalButtonRect;
end;

procedure TfpgBaseEditCombo.HandleKeyChar(var AText: TfpgChar;
    var shiftstate: TShiftState; var consumed: Boolean);
var
  s: TfpgChar;
  prevval: string;
  i: integer;
begin
  prevval   := FText;
  s         := AText;
  consumed  := False;
  if FText = '' then
    FNewItem := False;

  // Handle only printable characters
  // Note: This is now UTF-8 compliant!
  if Enabled and (Ord(AText[1]) > 31) and (Ord(AText[1]) < 127) or (Length(AText) > 1) then
  begin
    if (FMaxLength <= 0) or (UTF8Length(FText) < FMaxLength) then
    begin
      UTF8Insert(s, FText, FCursorPos + UTF8Length(s));
      Inc(FCursorPos);
      FSelStart := FCursorPos;
      if Assigned(FDropDown) then
        FDropDown.Close;
      FSelectedItem := -1;
      for i := 0 to FItems.Count-1 do
        if SameText(UTF8Copy(FItems.Strings[i], 1, UTF8Length(FText)), FText) then
        begin
          FSelectedItem:= i;
          DoDropDown;
          Break;
        end;
      if FSelectedItem = -1 then
        if FAllowNew = anNo then
        begin
          UTF8Delete(FText, FCursorPos, 1);
          Dec(FCursorPos);
          FSelStart := FCursorPos;
          for i := 0 to FItems.Count-1 do
            if SameText(UTF8Copy(FItems.Strings[i], 1, UTF8Length(FText)), FText) then
            begin
              FSelectedItem:= i;
              DoDropDown;
              Break;
            end;
        end
        else
          FNewItem:= True;
    end;
    consumed := True;
  end;

  if prevval <> FText then
    DoOnChange;

  if consumed then
    RePaint;
//  else
    inherited HandleKeyChar(AText, shiftstate, consumed);
end;

procedure TfpgBaseEditCombo.HandleKeyPress(var keycode: word;
    var shiftstate: TShiftState; var consumed: boolean);
var
  hasChanged: boolean;
  i: integer;
begin
  hasChanged := False;

  if not Enabled then
    consumed := False
  else
  begin
    consumed := True;

    case keycode of
      keyBackSpace:
          begin
            if FCursorPos > 0 then
            begin
              UTF8Delete(FText, FCursorPos, 1);
              Dec(FCursorPos);
              FSelStart := FCursorPos;
            if Assigned(FDropDown) then
              FDropDown.Close;
            FSelectedItem := -1;
            for i := 0 to FItems.Count-1 do
              if SameText(UTF8Copy(FItems.Strings[i], 1, UTF8Length(FText)), FText) then
              begin
                FSelectedItem:= i;
                if FNewItem then
                  FNewItem:= False;
                DoDropDown;
                Break;
              end;
            hasChanged := True;
            end;
          end;
      keyDelete:
          begin
            if FAllowNew <> anNo then
            begin
              FocusItem := -1;
              FSelectedItem := -1;
              FNewItem:= True;
              hasChanged := True;
            end;
          end;

      keyReturn,
      keyPEnter:
          begin
            if FSelectedItem > -1 then
              SetText(Items[FSelectedItem])
            else
              FocusItem:= -1;
            if FNewItem then
              case FAllowNew of
                anYes:
                  begin
                    FItems.Add(FText);
                    FocusItem := Pred(FItems.Count);
                  end;
                anAsk:
                  begin
                    if TfpgMessageDialog.Question(rsNewItemDetected, Format(rsAddNewItem, [FText])) = mbYes then
                    begin
                      FItems.Add(FText);
                      FFocusItem := Pred(FItems.Count);
                    end
                    else
                    begin
                      FNewItem:= False;
                      FFocusItem := -1;
                      FText:= '';
                    end;  { if/else }
                    Parent.ActivateWindow;
                  end;
                end;
            hasChanged := True;
            if Assigned(FDropDown) then
              FDropDown.Close;
          end;
      else
      begin
        Consumed := False;
      end;
    end;
  end;

  if Consumed then
  begin
    FSelStart  := FCursorPos;
    FSelOffset := 0;
  end;

  if consumed and hasChanged then
    RePaint;

  if hasChanged then
    DoOnChange;
  inherited HandleKeyPress(keycode, shiftstate, consumed);
end;

procedure TfpgBaseEditCombo.HandleLMouseDown(x, y: integer;
    shiftstate: TShiftState);
begin
  inherited HandleLMouseDown(x, y, shiftstate);
  // button state is down only if user clicked in the button rectangle.
  FBtnPressed := PtInRect(FInternalBtnRect, Point(x, y));
  if not FAutoCompletion then
  begin
    PaintInternalButton;
    DoDropDown;
  end
  else if FBtnPressed then
    begin
      PaintInternalButton;
      DoDropDown;
    end;
end;

procedure TfpgBaseEditCombo.HandleLMouseUp(x, y: integer;
    shiftstate: TShiftState);
begin
  inherited HandleLMouseUp(x, y, shiftstate);
  FBtnPressed := False;
  PaintInternalButton;
end;

procedure TfpgBaseEditCombo.HandlePaint;
var
  r: TfpgRect;
  tw, tw2, st, len: integer;
  Texte: string;

  // paint selection rectangle
  procedure DrawSelection;
  var
    lcolor: TfpgColor;
  begin
    if Focused then
    begin
      lcolor := clSelection;
      Canvas.SetTextColor(clSelectionText);
    end
    else
    begin
      lcolor := clInactiveSel;
      Canvas.SetTextColor(clText1);
    end;

    len := FSelOffset;
    st  := FSelStart;
    if len < 0 then
    begin
      st  := st + len;
      len := -len;
    end;
    tw  := Font.TextWidth(UTF8Copy(Items[FSelectedItem], 1, st));
    tw2 := Font.TextWidth(UTF8Copy(Items[FSelectedItem], 1, st + len));

    // XOR on Anti-aliased text doesn't look to good. Lets try standard
    // Blue & White like what was doen in TfpgEdit.
{   Canvas.SetColor(lcolor);
    Canvas.FillRectangle(-FDrawOffset + FMargin + tw, 3, tw2 - tw, Font.Height);
    r.SetRect(-FDrawOffset + FMargin + tw, 3, tw2 - tw, Font.Height);
    Canvas.AddClipRect(r);
    Canvas.SetTextColor(clWhite);
    fpgStyle.DrawString(Canvas, -FDrawOffset + FMargin, 3, Text, Enabled);
    Canvas.ClearClipRect;
}
    Canvas.XORFillRectangle(fpgColorToRGB(lcolor) xor $FFFFFF,
      -FDrawOffset + FMargin + tw, 3, tw2 - tw, Font.Height);
  end;

begin
  Canvas.BeginDraw;
//  inherited HandlePaint;
  Canvas.ClearClipRect;
  r.SetRect(0, 0, Width, Height);
  Canvas.DrawControlFrame(r);

  // internal background rectangle (without frame)
  InflateRect(r, -2, -2);
  Canvas.SetClipRect(r);

  if Enabled then
    Canvas.SetColor(FBackgroundColor)
  else
    Canvas.SetColor(clWindowBackground);

  Canvas.FillRectangle(r);

  // paint the fake dropdown button
  PaintInternalButton;

  Dec(r.Width, FInternalBtnRect.Width);
  Canvas.SetClipRect(r);
  Canvas.SetFont(Font);

  if not AutoCompletion then
    if Focused then
    begin
      Canvas.SetColor(clSelection);
      Canvas.SetTextColor(clSelectionText);
      InflateRect(r, -1, -1);
    end
    else
    begin
      if Enabled then
        Canvas.SetColor(FBackgroundColor)
      else
        Canvas.SetColor(clWindowBackground);
      Canvas.SetTextColor(FTextColor);
    end
  else
  begin
    if Enabled then
      Canvas.SetColor(FBackgroundColor)
    else
      Canvas.SetColor(clWindowBackground);
    Canvas.SetTextColor(FTextColor);
  end;
  Canvas.FillRectangle(r);

  // Draw select item's text
  if not AutoCompletion then
  begin
    if HasText then
      fpgStyle.DrawString(Canvas, FMargin+1, FMargin, Text, Enabled)
    else
      begin
      Canvas.SetTextColor(clShadow1);
      fpgStyle.DrawString(Canvas, FMargin+1, FMargin, ExtraHint, Enabled);
      end;
  end
  else
  begin
    if HasText then
    begin
      FSelOffset := 0;
      fpgStyle.DrawString(Canvas, FMargin+1, FMargin, Text, Enabled);
    end
    else
    begin
      Texte := Text;
      if Texte <> '' then
        if FSelectedItem > -1 then
        begin
          FSelOffset := Font.TextWidth(UTF8Copy(Items[FSelectedItem], UTF8Length(FText) + 1,
            UTF8Length(Items[FSelectedItem]) - UTF8Length(FText)));
          fpgStyle.DrawString(Canvas, FMargin+1, FMargin, FText + UTF8Copy(Items[FSelectedItem],
            UTF8Length(FText) + 1, UTF8Length(Items[FSelectedItem]) - UTF8Length(FText)), Enabled);
        end
        else
        begin
          FSelOffset := 0;
          fpgStyle.DrawString(Canvas, FMargin+1, FMargin, FText, Enabled);
        end;
    end;

    if Focused then
    begin
      // drawing selection
      if FSelOffset <> 0 then
        DrawSelection;

      // drawing cursor
      FCursorPos:= UTF8Length(FText);
      tw := Font.TextWidth(UTF8Copy(FText, 1, FCursorPos));
      fpgCaret.SetCaret(Canvas, -FDrawOffset + FMargin + tw, FMargin, fpgCaret.Width, Font.Height);
    end
    else
      fpgCaret.UnSetCaret(Canvas);
  end;

  Canvas.EndDraw;
end;

constructor TfpgBaseEditCombo.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FBackgroundColor  := clBoxColor;
  FTextColor        := Parent.TextColor;
  FWidth            := 120;
  FHeight           := Font.Height + 6;
  FMargin           := 3;
  FFocusable        := True;
  FAutocompletion   := False;
  FAllowNew         := anNo;

  FText             := '';
  FCursorPos        := UTF8Length(FText);
  FSelStart         := FCursorPos;
  FSelOffset        := 0;
  FDrawOffset       := 0;
  FSelectedItem     := -1;       // to allow typing if list is empty
  FNewItem          := False;

  CalculateInternalButtonRect;
end;

destructor TfpgBaseEditCombo.Destroy;
begin
  FDropDown.Free;
  inherited Destroy;
end;

procedure TfpgBaseEditCombo.Clear;
begin
  Text := '';
  Items.Clear;
end;

procedure TfpgBaseEditCombo.SetFocus;
var
  i: integer;
begin
  HandleSetFocus;
  if FText > '' then
    for i := 0 to Items.Count-1 do
      if SameText(UTF8Copy(Items.Strings[i], 1, UTF8Length(FText)), FText) then
      begin
        FSelectedItem := i;
        FNewItem := False;
        Exit; //==>
      end;
end;

procedure TfpgBaseEditCombo.Update;
begin
  FFocusItem := -1;
  Repaint;
end;

end.