summaryrefslogtreecommitdiff
path: root/src/gui/fpg_menu.pas
blob: fa1c8bad97b4b873429f44812ea3fc15541431f5 (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
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
{
    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 MainMenu Bar, Popup Menu and Menu Item controls.
}

unit fpg_menu;

{$mode objfpc}{$H+}

{.$Define DEBUG}

{
  TODO:
    * Refactor the HotKey painting code into Canvas.DrawString so that other
      widgets like TfpgButton could also use it.
    * Global keyboard activation of menu items are still missing.
}

interface

uses
  Classes,
  SysUtils,
  fpg_base,
  fpg_main,
  fpg_widget,
  fpg_popupwindow,
  fpg_stringutils,
  fpg_command_intf;
  
type
  TfpgHotKeyDef = string;
  
  TfpgMenuOption = (mnuo_autoopen,          // auto open menus when mouse over menubar
                    mnuo_nofollowingmouse   // don't auto open new menus as mouse moves over menubar
                    );
  
  TfpgMenuOptions = set of TfpgMenuOption;
  
  // forward declarations
  TfpgPopupMenu = class;
  TfpgMenuBar = class;
  
  
  TfpgMenuItem = class(TComponent, ICommandHolder)
  private
    FCommand: ICommand;
    FEnabled: boolean;
    FHotKeyDef: TfpgHotKeyDef;
    FOnClick: TNotifyEvent;
    FSeparator: boolean;
    FSubMenu: TfpgPopupMenu;
    FText: TfpgString;
    FVisible: boolean;
    procedure   SetEnabled(const AValue: boolean);
    procedure   SetHotKeyDef(const AValue: TfpgHotKeyDef);
    procedure   SetSeparator(const AValue: boolean);
    procedure   SetText(const AValue: TfpgString);
    procedure   SetVisible(const AValue: boolean);
  public
    constructor Create(AOwner: TComponent); override;
    procedure   Click;
    function    Selectable: boolean;
    function    GetAccelChar: string;
    procedure   DrawText(ACanvas: TfpgCanvas; x, y: TfpgCoord);
    function    GetCommand: ICommand;
    procedure   SetCommand(ACommand: ICommand);
    property    Text: TfpgString read FText write SetText;
    property    HotKeyDef: TfpgHotKeyDef read FHotKeyDef write SetHotKeyDef;
    property    Separator: boolean read FSeparator write SetSeparator;
    property    Visible: boolean read FVisible write SetVisible;
    property    Enabled: boolean read FEnabled write SetEnabled;
    property    SubMenu: TfpgPopupMenu read FSubMenu write FSubMenu;
    property    OnClick: TNotifyEvent read FOnClick write FOnClick;
  end;
  
  
  // Actual Menu Items are stored in TComponent's Components property
  // Visible only items are stored in FItems just before a paint
  TfpgPopupMenu = class(TfpgPopupWindow)
  private
    FBeforeShow: TNotifyEvent;
    FMargin: TfpgCoord;
    FTextMargin: TfpgCoord;
    procedure   DoSelect;
    procedure   CloseSubmenus;
    function    GetItemPosY(index: integer): integer;
    function    CalcMouseRow(y: integer): integer;
    function    VisibleCount: integer;
    function    VisibleItem(ind: integer): TfpgMenuItem;
    function    MenuFocused: boolean;
    function    SearchItemByAccel(s: string): integer;
  protected
    FMenuFont: TfpgFont;
    FMenuAccelFont: TfpgFont;
    FMenuDisabledFont: TfpgFont;
    FSymbolWidth: integer;
    FItems: TList;
    FFocusItem: integer;
    procedure   HandleMouseEnter; override;
    procedure   HandleMouseExit; override;
    procedure   HandleMouseMove(x, y: integer; btnstate: word; shiftstate: TShiftState); override;
    procedure   HandleLMouseDown(x, y: integer; shiftstate: TShiftState); override;
    procedure   HandleLMouseUp(x, y: integer; shiftstate: TShiftState); override;
    procedure   HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: boolean); override;
    procedure   HandlePaint; override;
    procedure   HandleShow; override;
    procedure   HandleClose; override;
    procedure   DrawItem(mi: TfpgMenuItem; rect: TfpgRect); virtual;
    procedure   DrawRow(line: integer; focus: boolean); virtual;
    function    ItemHeight(mi: TfpgMenuItem): integer; virtual;
    procedure   PrepareToShow;
  public
    OpenerPopup: TfpgPopupMenu;
    OpenerMenuBar: TfpgMenuBar;
    constructor Create(AOwner: TComponent); override;
    destructor  Destroy; override;
    procedure   Close; override;
    function    AddMenuItem(const AMenuName: TfpgString; const hotkeydef: string; HandlerProc: TNotifyEvent): TfpgMenuItem;
    function    MenuItemByName(const AMenuName: TfpgString): TfpgMenuItem;
    function    MenuItem(const AMenuPos: integer): TfpgMenuItem;  // added to allow for localization
    property    BeforeShow: TNotifyEvent read FBeforeShow write FBeforeShow;
  end;
  
  
  // Actual Menu Items are stored in TComponents Components property
  // Visible only items are stored in FItems just before a paint
  TfpgMenuBar = class(TfpgWidget)
  private
    FBeforeShow: TNotifyEvent;
    FLightColor: TfpgColor;
    FDarkColor: TfpgColor;
    FMenuOptions: TfpgMenuOptions;
    FPrevFocusItem: integer;
    FFocusItem: integer;
    procedure   SetFocusItem(const AValue: integer);
    procedure   DoSelect;
    procedure   CloseSubmenus;
    function    ItemWidth(mi: TfpgMenuItem): integer;
  protected
    FItems: TList;  // stores visible items only
    property    FocusItem: integer read FFocusItem write SetFocusItem;
    procedure   PrepareToShow;
    function    VisibleCount: integer;
    function    VisibleItem(ind: integer): TfpgMenuItem;
    procedure   HandleShow; override;
    procedure   HandleMouseMove(x, y: integer; btnstate: word; shiftstate: TShiftState); override;
    procedure   HandleLMouseDown(x, y: integer; shiftstate: TShiftState); override;
    procedure   HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: boolean); override;
    procedure   HandlePaint; override;
    function    CalcMouseCol(x: integer): integer;
    function    GetItemPosX(index: integer): integer;
    function    MenuFocused: boolean;
    function    SearchItemByAccel(s: string): integer;
    procedure   ActivateMenu;
    procedure   DeActivateMenu;
    procedure   DrawColumn(col: integer; focus: boolean); virtual;
  public
    constructor Create(AOwner: TComponent); override;
    destructor  Destroy; override;
    function    AddMenuItem(const AMenuTitle: string; OnClickProc: TNotifyEvent): TfpgMenuItem;
    function    MenuItem(const AMenuPos: integer): TfpgMenuItem;  // added to allow for localization
    property    MenuOptions: TfpgMenuOptions read FMenuOptions write FMenuOptions;
    property    BeforeShow: TNotifyEvent read FBeforeShow write FBeforeShow;
  end;


function CreateMenuBar(AOwner: TfpgWidget; x, y, w, h: TfpgCoord): TfpgMenuBar; overload;
function CreateMenuBar(AOwner: TfpgWidget): TfpgMenuBar; overload;


implementation

var
  uFocusedPopupMenu: TfpgPopupMenu;

function CreateMenuBar(AOwner: TfpgWidget; x, y, w, h: TfpgCoord): TfpgMenuBar;
begin
  if AOwner = nil then
    raise Exception.Create('MenuBar component must have an Owner assigned');
  Result       := TfpgMenuBar.Create(AOwner);
  Result.Left  := x;
  Result.Top   := y;
  if w = 0 then
    Result.Width := AOwner.Width
  else
    Result.Width := w;
  if h > 0 then
    Result.Height := h;
end;

function CreateMenuBar(AOwner: TfpgWidget): TfpgMenuBar;
begin
  Result := CreateMenuBar(AOwner, 0, 0, 0, 0);
end;


{ TfpgMenuItem }

procedure TfpgMenuItem.SetText(const AValue: TfpgString);
begin
  if FText = AValue then
    Exit; //==>
  FText := AValue;
end;

procedure TfpgMenuItem.SetVisible(const AValue: boolean);
begin
  if FVisible=AValue then exit;
  FVisible:=AValue;
end;

procedure TfpgMenuItem.SetHotKeyDef(const AValue: TfpgHotKeyDef);
begin
  if FHotKeyDef=AValue then exit;
  FHotKeyDef:=AValue;
end;

procedure TfpgMenuItem.SetEnabled(const AValue: boolean);
begin
  if FEnabled=AValue then exit;
  FEnabled:=AValue;
end;

procedure TfpgMenuItem.SetSeparator(const AValue: boolean);
begin
  if FSeparator=AValue then exit;
  FSeparator:=AValue;
end;

constructor TfpgMenuItem.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  Text := '';
  HotKeyDef := '';
  FSeparator := False;
  FVisible := True;
  FEnabled := True;
  FSubMenu := nil;
  FOnClick := nil;
end;

procedure TfpgMenuItem.Click;
begin
  if Assigned(FOnClick) then
    FOnClick(self);
end;

function TfpgMenuItem.Selectable: boolean;
begin
  Result := Enabled and Visible and (not Separator);
end;

function TfpgMenuItem.GetAccelChar: string;
var
  p: integer;
begin
  p := UTF8Pos('&', Text);
  if p > 0 then
  begin
    Result := UTF8Copy(Text, p+1, 1);
  end
  else
    Result := '';
end;

procedure TfpgMenuItem.DrawText(ACanvas: TfpgCanvas; x, y: TfpgCoord);
var
  s: string;
  p: integer;
  achar: string;
begin
//  writeln('DrawText  x:', x, '  y:', y);
  if not Enabled then
    ACanvas.SetFont(fpgStyle.MenuDisabledFont)
  else
    ACanvas.SetFont(fpgStyle.MenuFont);

  achar := '&';
  s := Text;

  repeat
    p := UTF8Pos(achar, s);
    if p > 0 then
    begin
      // first part of text before the & sign
      ACanvas.DrawString(x, y, UTF8Copy(s, 1, p-1));
      inc(x, fpgStyle.MenuFont.TextWidth(UTF8Copy(s, 1, p-1)));
      if UTF8Copy(s, p+1, 1) = achar then
      begin
        // Do we need to paint a actual & sign (create via && in item text)
        ACanvas.DrawString(x, y, achar);
        inc(x, fpgStyle.MenuFont.TextWidth(achar));
      end
      else
      begin
        // Draw the HotKey text
        if Enabled then
          ACanvas.SetFont(fpgStyle.MenuAccelFont);
        ACanvas.DrawString(x, y, UTF8Copy(s, p+1, 1));
        inc(x, ACanvas.Font.TextWidth(UTF8Copy(s, p+1, 1)));
        if Enabled then
          ACanvas.SetFont(fpgStyle.MenuFont);
      end;
      s := UTF8Copy(s, p+2, UTF8Length(s));
    end;  { if }
  until p < 1;

  // Draw the remaining text after the & sign
  if UTF8Length(s) > 0 then
    ACanvas.DrawString(x, y, s);
end;

function TfpgMenuItem.GetCommand: ICommand;
begin
  Result := FCommand;
end;

procedure TfpgMenuItem.SetCommand(ACommand: ICommand);
begin
  FCommand := ACommand;
end;

{ TfpgMenuBar }

procedure TfpgMenuBar.SetFocusItem(const AValue: integer);
begin
  if FFocusItem = AValue then
    Exit;
  FPrevFocusItem := FFocusItem;
  FFocusItem := AValue;
end;

procedure TfpgMenuBar.PrepareToShow;
var
  n: integer;
  mi: TfpgMenuItem;
begin
  if Assigned(FBeforeShow) then
    FBeforeShow(self);

  FItems.Count := 0;
  // Collecting visible items
  for n := 0 to ComponentCount-1 do
  begin
    if Components[n] is TfpgMenuItem then
    begin
      mi := TfpgMenuItem(Components[n]);
      if mi.Visible then
        FItems.Add(mi);
    end;
  end;
end;

function TfpgMenuBar.VisibleCount: integer;
begin
  Result := FItems.Count;
end;

function TfpgMenuBar.VisibleItem(ind: integer): TfpgMenuItem;
begin
  if (ind < 0) or (ind > FItems.Count-1) then
    Result := nil
  else
    Result := TfpgMenuItem(FItems.Items[ind]);
end;

procedure TfpgMenuBar.HandleShow;
begin
  PrepareToShow;
  inherited HandleShow;
end;

procedure TfpgMenuBar.HandleMouseMove(x, y: integer; btnstate: word; shiftstate: TShiftState);
var
  newf: integer;
begin
  inherited HandleMouseMove(x, y, btnstate, shiftstate);

  // process menu options
  if mnuo_nofollowingmouse in FMenuOptions then
  begin
    if not MenuFocused then
      Exit; //==>
  end
  else if mnuo_autoopen in FMenuOptions then
  begin
    if not Focused then
      ActivateMenu;
  end
  else
  begin
    if not Focused then
      Exit;
  end;


  newf := CalcMouseCol(x);
  if not VisibleItem(newf).Selectable then
    Exit; //==>

  if newf = FFocusItem then
    Exit; //==>

  FocusItem := newf;
  // continue processing menu options
  if mnuo_autoopen in FMenuOptions then
    DoSelect
  else
  begin
    Repaint;
    if not MenuFocused then
      DoSelect;
  end
end;

procedure TfpgMenuBar.HandleLMouseDown(x, y: integer; shiftstate: TShiftState);
var
  newf: integer;
begin
  inherited HandleLMouseDown(x, y, shiftstate);
  
  if ComponentCount = 0 then
    Exit; // We have no menu items in MainMenu.

  if not Focused then
    ActivateMenu;
  //else
  //begin
    //CloseSubmenus;
    //DeActivateMenu;
    //Exit; //==>
  //end;

  newf := CalcMouseCol(x);

  if not VisibleItem(newf).Selectable then
    Exit; //==>

  if newf <> FFocusItem then
  begin
//    DrawColumn(FFocusItem, False);
    FocusItem := newf;
//    DrawColumn(FFocusItem, True);
  end;

  DoSelect;
end;

procedure TfpgMenuBar.HandleKeyPress(var keycode: word;
  var shiftstate: TShiftState; var consumed: boolean);
var
  s: string;
  i: integer;
begin
//  writeln(Classname, '.Keypress');
  s := KeycodeToText(keycode, shiftstate);
//  writeln('s: ', s);
  // handle MenuBar (Alt+?) shortcuts only - for now!
  if (length(s) = 5) and (copy(s, 1, 4) = 'Alt+') then
  begin
    s := KeycodeToText(keycode, []);
    i := SearchItemByAccel(s);
    if i <> -1 then
    begin
      consumed := True;
//      writeln('Selected ', VisibleItem(i).Text);
      FFocusItem := i;
      DoSelect;
    end;
  end;
  inherited HandleKeyPress(keycode, shiftstate, consumed);
end;

procedure TfpgMenuBar.HandlePaint;
var
  n: integer;
  r: TfpgRect;
begin
  Canvas.BeginDraw;
  inherited HandlePaint;
  r.SetRect(0, 0, Width, Height);
  Canvas.Clear(FBackgroundColor);
//  Canvas.DrawButtonFace(r, []);
  // inner bottom line
  Canvas.SetColor(clShadow1);
  Canvas.DrawLine(r.Left, r.Bottom-1, r.Right+1, r.Bottom-1);   // bottom
  // outer bottom line
  Canvas.SetColor(clHilite1);
  Canvas.DrawLine(r.Left, r.Bottom, r.Right+1, r.Bottom);   // bottom

  for n := 0 to VisibleCount-1 do
    DrawColumn(n, n = FocusItem);
  Canvas.EndDraw;
end;

constructor TfpgMenuBar.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FItems := TList.Create;
  FBeforeShow       := nil;
  FFocusItem        := -1;
  FPrevFocusItem    := -1;
  FFocusable        := False;
  FBackgroundColor  := Parent.BackgroundColor;
  FTextColor        := Parent.TextColor;
  // calculate the best height based on font
  FHeight := fpgStyle.MenuFont.Height + 6; // 3px margin top and bottom

  FLightColor := TfpgColor($f0ece3);  // color at top of menu bar
  FDarkColor  := TfpgColor($beb8a4);  // color at bottom of menu bar
  
  FMenuOptions := [];
end;

destructor TfpgMenuBar.Destroy;
begin
  FItems.Free;
  inherited Destroy;
end;

function TfpgMenuBar.ItemWidth(mi: TfpgMenuItem): integer;
begin
  Result := fpgStyle.MenuFont.TextWidth(mi.Text) + (2*6);
end;

procedure TfpgMenuBar.DrawColumn(col: integer; focus: boolean);
var
  n: integer;
  r: TfpgRect;
  mi: TfpgMenuItem;
begin
  Canvas.BeginDraw;
  r.SetRect(2, 1, 1, fpgStyle.MenuFont.Height+1);

  for n := 0 to VisibleCount-1 do
  begin
    mi := VisibleItem(n);
    r.width := ItemWidth(mi);
    if col = n then
    begin
      if focus and Focused then
      begin
        if MenuFocused then
        begin
          Canvas.SetColor(clSelection);
          Canvas.SetTextColor(clSelectionText);
        end
        else
        begin
//          Canvas.SetColor(clInactiveSel);
          Canvas.SetColor(clShadow1);
          Canvas.SetTextColor(clInactiveSelText);
        end;
      end
      else
      begin
        if mi.Enabled then
        begin
          Canvas.SetColor(BackgroundColor);
          Canvas.SetTextColor(clMenuText);
        end
        else
        begin
          Canvas.SetColor(BackgroundColor);
          Canvas.SetTextColor(clMenuDisabled);
        end;
      end;  { if/else }
      Canvas.FillRectangle(r);
      // a possible future theme option
//      Canvas.GradientFill(r, FLightColor, FDarkColor, gdVertical);
      mi.DrawText(Canvas, r.left+4, r.top+1);
      Canvas.EndDraw(r.Left, r.Top, r.Width, r.Height);
      Exit; //==>
    end;  { if col=n }
    inc(r.Left, ItemWidth(mi));
  end;  { for }
end;

function TfpgMenuBar.CalcMouseCol(x: integer): integer;
var
  w: integer;
  n: integer;
begin
  Result := 0;
  w := 0;
  n := 0;
  while (w <= x) and (n < VisibleCount) do
  begin
    Result := n;
    inc(w, ItemWidth(VisibleItem(n)));
    inc(n);
  end;
end;

function TfpgMenuBar.GetItemPosX(index: integer): integer;
var
  n: integer;
begin
  Result := 0;
  if index < 0 then
    Exit; //==>
  n := 0;
  while (n < VisibleCount) and (n < index) do
  begin
    Inc(result, ItemWidth(VisibleItem(n)));
    inc(n);
  end;
end;

procedure TfpgMenuBar.DoSelect;
var
  mi: TfpgMenuItem;
begin
  mi := VisibleItem(FocusItem);
  CloseSubMenus;  // deactivates menubar!

  if mi.SubMenu <> nil then
  begin
    ActivateMenu;
    // showing the submenu
    mi.SubMenu.ShowAt(self, GetItemPosX(FocusItem)+2, fpgStyle.MenuFont.Height+4);
    mi.SubMenu.OpenerPopup      := nil;
    mi.SubMenu.OpenerMenuBar    := self;
    mi.SubMenu.DontCloseWidget  := self;
    uFocusedPopupMenu           := mi.SubMenu;
    RePaint;
  end
  else
  begin
    VisibleItem(FocusItem).Click;
    DeActivateMenu;
  end;
end;

procedure TfpgMenuBar.CloseSubmenus;
var
  n: integer;
begin
  // Close all previous popups
  for n := 0 to VisibleCount-1 do
    with VisibleItem(n) do
    begin
      if (SubMenu <> nil) and (SubMenu.HasHandle) then
        SubMenu.Close;
    end;
end;

function TfpgMenuBar.MenuFocused: boolean;
var
  n: integer;
  mi: TfpgMenuItem;
begin
  Result := True;
  for n := 0 to VisibleCount-1 do
  begin
    mi := VisibleItem(n);
    if (mi.SubMenu <> nil) and (mi.SubMenu.HasHandle) then
    begin
      Result := False;
      Break;
    end;
  end;
end;

function TfpgMenuBar.SearchItemByAccel(s: string): integer;
var
  n: integer;
begin
  Result := -1;
  for n := 0 to VisibleCount-1 do
  begin
    with VisibleItem(n) do
    begin
      {$Note Should UpperCase take note of UTF-8? }
      if Enabled and (UpperCase(s) = UpperCase(GetAccelChar)) then
      begin
        Result := n;
        Exit; //==>
      end;
    end;
  end;
end;

procedure TfpgMenuBar.DeActivateMenu;
begin
  Parent.ActiveWidget := nil;
end;

procedure TfpgMenuBar.ActivateMenu;
begin
  Parent.ActiveWidget := self;
end;

function TfpgMenuBar.AddMenuItem(const AMenuTitle: string; OnClickProc: TNotifyEvent): TfpgMenuItem;
begin
  Result := TfpgMenuItem.Create(self);
  Result.Text       := AMenuTitle;
  Result.HotKeyDef  := '';
  Result.OnClick    := OnClickProc;
  Result.Separator  := False;
end;

function TfpgMenuBar.MenuItem(const AMenuPos: integer): TfpgMenuItem;
begin
  Result:= TfpgMenuItem(Components[AMenuPos]);
end;

{ TfpgPopupMenu }

procedure TfpgPopupMenu.DoSelect;
var
  mi: TfpgMenuItem;
  op: TfpgPopupMenu;
begin
  mi := VisibleItem(FFocusItem);
  if mi.SubMenu <> nil then
  begin
    CloseSubMenus;
    // showing the submenu
    mi.SubMenu.ShowAt(self, Width, GetItemPosY(FFocusItem));
    mi.SubMenu.OpenerPopup := self;
    mi.SubMenu.OpenerMenuBar := OpenerMenuBar;
    uFocusedPopupMenu := mi.SubMenu;
    RePaint;
  end
  else
  begin
    // Close this popup
    Close;
    op := OpenerPopup;
    while op <> nil do
    begin
      if op.HasHandle then
        op.Close;
      op := op.OpenerPopup;
    end;
    VisibleItem(FFocusItem).Click;
  end;  { if/else }

//  if OpenerMenuBar <> nil then
//    OpenerMenuBar.DeActivateMenu;
end;

procedure TfpgPopupMenu.CloseSubmenus;
var
  n: integer;
begin
  // Close all previous popups
  for n := 0 to VisibleCount-1 do
  with VisibleItem(n) do
  begin
    if (SubMenu <> nil) and (SubMenu.HasHandle) then
      SubMenu.Close;
  end;
end;

function TfpgPopupMenu.GetItemPosY(index: integer): integer;
var
  n: integer;
begin
  Result := 2;
  if index < 0 then
    Exit; //==>
  n := 0;
  while (n < VisibleCount) and (n < index) do
  begin
    Inc(Result, ItemHeight(VisibleItem(n)));
    inc(n);
  end;
end;

procedure TfpgPopupMenu.HandleMouseMove(x, y: integer; btnstate: word; shiftstate: TShiftState);
var
  newf: integer;
begin
  inherited HandleMouseMove(x, y, btnstate, shiftstate);

  if not MenuFocused then
    Exit; //==>

  newf := CalcMouseRow(y);
  if newf < 0 then
    Exit; //==>

  if newf = FFocusItem then
    Exit; //==>

  FFocusItem := newf;
  Repaint;
end;

procedure TfpgPopupMenu.HandleLMouseDown(x, y: integer; shiftstate: TShiftState);
var
  r: TfpgRect;
begin
  inherited HandleLMouseDown(x, y, shiftstate);

  r.SetRect(0, 0, Width, Height);
  if not PtInRect(r, Point(x, y)) then
  begin
    ClosePopups;
    Exit; //==>
  end;
end;

procedure TfpgPopupMenu.HandleLMouseUp(x, y: integer; shiftstate: TShiftState);
var
  newf: integer;
  mi: TfpgMenuItem;
  r: TfpgRect;
begin
  inherited HandleLMouseUp(x, y, shiftstate);

  newf := CalcMouseRow(y);
  if newf < 0 then
    Exit;

  if not VisibleItem(newf).Selectable then
    Exit; //==>

  if newf <> FFocusItem then
    FFocusItem := newf;

  mi := VisibleItem(FFocusItem);
  if (mi <> nil) and (not MenuFocused) and (mi.SubMenu <> nil)
      and mi.SubMenu.HasHandle then
    mi.SubMenu.Close
  else
    DoSelect;
end;

procedure TfpgPopupMenu.HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: boolean);
var
  oldf: integer;
  i: integer;
  s: string;
  op: TfpgPopupMenu;
  trycnt: integer;

  procedure FollowFocus;
  begin
    if oldf <> FFocusItem then
    begin
      Repaint;
    end;
  end;

begin
  inherited HandleKeyPress(keycode, shiftstate, consumed);

  oldf := FFocusItem;

  consumed := true;
  case keycode of
    keyUp:
        begin // up
          trycnt := 2;
          i := FFocusItem-1;
          repeat
            while (i >= 0) and not VisibleItem(i).Selectable do
              dec(i);

            if i >= 0 then
              break;  //==>

            i := VisibleCount-1;
            dec(trycnt);
          until trycnt > 0;

          if i >= 0 then
            FFocusItem := i;
        end;
        
    keyDown:
        begin // down
          trycnt := 2;
          i := FFocusItem+1;
          repeat
            while (i < VisibleCount) and not VisibleItem(i).Selectable do
              inc(i);
            if i < VisibleCount then
              Break;  //==>
            i := 0;
            dec(trycnt);
          until trycnt > 0;

          if i < VisibleCount then
            FFocusItem := i;
        end;
        
    keyReturn:
        begin
          DoSelect;
        end;

    keyLeft:
        begin
          if OpenerMenubar <> nil then
            OpenerMenubar.HandleKeyPress(keycode, shiftstate, consumed);
        end;

    keyRight:
        begin
          if OpenerMenubar <> nil then
            OpenerMenubar.HandleKeyPress(keycode, shiftstate, consumed);
          // VisibleItem(FFocusItem).SubMenu <> nil then DoSelect;
        end;

    keyBackSpace:
        begin
          //if self.OpenerPopup <> nil then
          Close;
        end;

    keyEscape:
        begin
          Close;
          op := OpenerPopup;
          while op <> nil do
          begin
            op.Close;
            op := op.OpenerPopup;
          end;
        end;
  else
    consumed := false;
  end;

  FollowFocus;

  if (not consumed) and ((keycode and $8000) <> $8000) then
  begin
    // normal char
    s := chr(keycode and $00FF) + chr((keycode and $FF00) shr 8);
    i := SearchItemByAccel(s);
    if i >= 0 then
    begin
      FFocusItem := i;
      FollowFocus;
      Consumed := true;
      DoSelect;
    end;
  end;
end;

procedure TfpgPopupMenu.HandlePaint;
var
  n: integer;
begin
  Canvas.BeginDraw;
//  inherited HandlePaint;
  Canvas.Clear(BackgroundColor);
  Canvas.SetColor(clWidgetFrame);
  Canvas.DrawRectangle(0, 0, Width, Height);  // black rectangle border
  Canvas.DrawButtonFace(1, 1, Width-1, Height-1, []);  // 3d rectangle inside black border

  for n := 0 to VisibleCount-1 do
    DrawRow(n, n = FFocusItem);

  Canvas.EndDraw;
end;

procedure TfpgPopupMenu.HandleShow;
begin
  PrepareToShow;
  inherited HandleShow;
end;

procedure TfpgPopupMenu.HandleClose;
begin
  {$IFDEF DEBUG}
  writeln(Classname, '.HandleClose');
  {$ENDIF}
  inherited HandleClose;
end;

function TfpgPopupMenu.VisibleCount: integer;
begin
  Result := FItems.Count;
end;

function TfpgPopupMenu.VisibleItem(ind: integer): TfpgMenuItem;
begin
  if (ind < 0) or (ind > FItems.Count-1) then
    Result := nil
  else
    Result := TfpgMenuItem(FItems.Items[ind]);
end;

procedure TfpgPopupMenu.DrawItem(mi: TfpgMenuItem; rect: TfpgRect);
var
  s: string;
  x: integer;
  img: TfpgImage;
begin
  if mi.Separator then
  begin
    Canvas.SetColor(clMenuText);
    Canvas.DrawLine(rect.Left, rect.Top+2, rect.Right+1, rect.Top+2);
  end
  else
  begin
    x := rect.Left + FSymbolWidth + FTextMargin;

    mi.DrawText(Canvas, x, rect.top);

    if mi.HotKeyDef <> '' then
    begin
      s := mi.HotKeyDef;
      Canvas.DrawString(rect.Right-FMenuFont.TextWidth(s)-FTextMargin, rect.Top, s);
    end;

    if mi.SubMenu <> nil then
    begin
      canvas.SetColor(Canvas.TextColor);
      x := (rect.height div 2) - 3;
      img := fpgImages.GetImage('sys.sb.right');
      Canvas.DrawImage(rect.right-x-2, rect.Top + ((rect.Height-img.Height) div 2), img);
//      canvas.FillTriangle(rect.right-x-2, rect.top+2,
//                          rect.right-2, rect.top+2+x,
//                          rect.right-x-2, rect.top+2+2*x);
    end;
  end;
end;

procedure TfpgPopupMenu.DrawRow(line: integer; focus: boolean);
var
  n: integer;
  r: TfpgRect;
  mi: TfpgMenuItem;
begin
  Canvas.BeginDraw;
  r.SetRect(FMargin, FMargin, FWidth-(2*FMargin), FHeight-(2*FMargin));

  for n := 0 to VisibleCount-1 do
  begin
    mi := VisibleItem(n);

    r.height := ItemHeight(mi);

    if line = n then
    begin
      if focus and (not mi.Separator) then
      begin
        if MenuFocused then
        begin
          Canvas.SetColor(clSelection);
          if mi.Selectable then
            Canvas.SetTextColor(clSelectionText)
          else
            Canvas.SetTextColor(clMenuDisabled);
        end
        else
        begin
          Canvas.SetColor(clShadow1);
          Canvas.SetTextColor(clInactiveSelText);
        end;
      end
      else
      begin
        if mi.Enabled then
        begin
          Canvas.SetColor(BackgroundColor);
          Canvas.SetTextColor(clMenuText);
        end
        else
        begin
          Canvas.SetColor(BackgroundColor);
          Canvas.SetTextColor(clMenuDisabled);
        end;
      end;
      Canvas.FillRectangle(r);
      DrawItem(mi, r);
      Canvas.EndDraw(r.Left, r.Top, r.Width, r.Height);
      Exit; //==>
    end;
    inc(r.Top, ItemHeight(mi) );
  end;  { for }
end;

function TfpgPopupMenu.ItemHeight(mi: TfpgMenuItem): integer;
begin
  if mi.Separator then
    Result := 5
  else
    Result := FMenuFont.Height + 2;
end;

function TfpgPopupMenu.MenuFocused: boolean;
begin
  Result := (uFocusedPopupMenu = self);
end;

function TfpgPopupMenu.SearchItemByAccel(s: string): integer;
var
  n: integer;
begin
  result := -1;
  for n := 0 to VisibleCount-1 do
  begin
    with VisibleItem(n) do
    begin
      {$Note Do we need to use UTF-8 upper case? }
      if Enabled and (UpperCase(s) = UpperCase(GetAccelChar)) then
      begin
        result := n;
        Exit; //==>
      end;
    end;
  end;
end;

procedure TfpgPopupMenu.HandleMouseEnter;
begin
  {$IFDEF DEBUG}
  writeln(Classname, '.HandleMouseEnter');
  {$ENDIF}
  inherited HandleMouseEnter;
end;

procedure TfpgPopupMenu.HandleMouseExit;
begin
  {$IFDEF DEBUG}
  writeln(Classname, '.HandleMouseExit');
  {$ENDIF}
  inherited HandleMouseExit;
  FFocusItem := -1;
  Repaint;
end;

// Collecting visible items and measuring sizes
procedure TfpgPopupMenu.PrepareToShow;
var
  n: integer;
  h: integer;
  tw: integer;
  hkw: integer;
  x: integer;
  mi: TfpgMenuItem;
begin
  if Assigned(FBeforeShow) then
    BeforeShow(self);

  // Collecting visible items
  FItems.Count := 0;

  for n := 0 to ComponentCount-1 do
  begin
    if Components[n] is TfpgMenuItem then
    begin
      mi := TfpgMenuItem(Components[n]);
      if mi.Visible then
        FItems.Add(mi);
    end;
  end;

  // Measuring sizes
  h             := 0;   // height
  tw            := 0;   // text width
  hkw           := 0;   // hotkey width
  FSymbolWidth  := 0;
  for n := 0 to VisibleCount-1 do
  begin
    mi  := VisibleItem(n);
    x   := ItemHeight(mi);
    inc(h, x);
    x := FMenuFont.TextWidth(mi.Text);
    if tw < x then
      tw := x;

    if mi.SubMenu <> nil then
      x := FMenuFont.Height
    else
      x := FMenuFont.TextWidth(mi.HotKeyDef);
    if hkw < x then
      hkw := x;
  end;

  if hkw > 0 then
    hkw := hkw + 10; // spacing between text and hotkey text

  FHeight := FMargin*2 + h;
  FWidth  := (FMargin+FTextMargin)*2 + FSymbolWidth + tw + hkw;

  uFocusedPopupMenu := self;
end;

function TfpgPopupMenu.CalcMouseRow(y: integer): integer;
var
  h: integer;
  n: integer;
begin
  h := 2;
  n := 0;
  Result := n;

  // sanity check
  if y < 0 then
    Exit
  else
    n := 0;
    
  while (h <= y) and (n < VisibleCount) do
  begin
    Result := n;
    inc(h, ItemHeight(VisibleItem(n)));
    inc(n);
  end;
end;

constructor TfpgPopupMenu.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FMargin     := 3;
  FTextMargin := 3;
  FItems      := TList.Create;

  // fonts
  FMenuFont         := fpgStyle.MenuFont;
  FMenuAccelFont    := fpgStyle.MenuAccelFont;
  FMenuDisabledFont := fpgStyle.MenuDisabledFont;
  FSymbolWidth      := FMenuFont.Height+2;

  FBeforeShow   := nil;
  FFocusItem    := -1;
  OpenerPopup   := nil;
  OpenerMenubar := nil;
end;

destructor TfpgPopupMenu.Destroy;
begin
  {$IFDEF DEBUG}
  writeln(Classname, '.Destroy');
  {$ENDIF}
  FItems.Free;
  inherited Destroy;
end;

{$Note See if we can move this to HandleHide + not make Close virtual! }
procedure TfpgPopupMenu.Close;
var
  n: integer;
  mi: TfpgMenuItem;
begin
  for n := 0 to FItems.Count-1 do
  begin
    mi := TfpgMenuItem(FItems[n]);
    if mi.SubMenu <> nil then
    begin
      if mi.SubMenu.HasHandle then
        mi.SubMenu.Close;
    end;
  end;
  inherited Close;
  uFocusedPopupMenu := OpenerPopup;
  if (uFocusedPopupMenu <> nil) and uFocusedPopupMenu.HasHandle then
    uFocusedPopupMenu.RePaint;

  if (OpenerMenuBar <> nil) and OpenerMenuBar.HasHandle then
  begin
    if (OpenerPopup = nil) or not OpenerPopup.HasHandle then
    begin
      OpenerMenuBar.DeActivateMenu;
      //OpenerMenuBar.Repaint;
    end;
    //else
    //OpenerMenuBar.RePaint;
  end;
end;

function TfpgPopupMenu.AddMenuItem(const AMenuName: TfpgString;
    const hotkeydef: string; HandlerProc: TNotifyEvent): TfpgMenuItem;
begin
  result := TfpgMenuItem.Create(self);
  if AMenuName <> '-' then
  begin
    result.Text := AMenuName;
    result.hotkeydef := hotkeydef;
    result.OnClick := HandlerProc;
  end
  else
  begin
    result.Separator := true;
  end;
end;

function TfpgPopupMenu.MenuItemByName(const AMenuName: TfpgString): TfpgMenuItem;
var
  i: integer;
begin
  Result := nil;
  for i := 0 to ComponentCount-1 do
  begin
    if Components[i] is TfpgMenuItem then
      if SameText(TfpgMenuItem(Components[i]).Text, AMenuName) then
      begin
        Result := TfpgMenuItem(Components[i]);
        Exit; //==>
      end;
  end;
end;

function TfpgPopupMenu.MenuItem(const AMenuPos: integer): TfpgMenuItem;
begin
  Result:= TfpgMenuItem(Components[AMenuPos]);
end;

initialization
  uFocusedPopupMenu := nil;
  
end.