-
Notifications
You must be signed in to change notification settings - Fork 1
/
camarkup.pas
1101 lines (998 loc) · 29.7 KB
/
camarkup.pas
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
unit caMarkup;
{$INCLUDE ca.inc}
interface
uses
Windows,
Messages,
SysUtils,
Classes,
Graphics,
Controls,
Forms,
Dialogs,
StdCtrls,
caClasses,
caUtils,
// caUtils,
caGraphics;
type
//---------------------------------------------------------------------------
// IcaHTMLElement
//---------------------------------------------------------------------------
IcaHTMLElement = interface
['{EA991982-EC63-4D17-9DF8-FD373629DB4D}']
// Property methods
function GetAscent: Integer;
function GetBeginText: String;
function GetBounds: TRect;
function GetBreakLine: Boolean;
function GetEndText: String;
function GetFontColor: TColor;
function GetFontName: String;
function GetFontSize: Integer;
function GetFontStyle: TFontStyles;
function GetHeight: Integer;
function GetText: String;
function GetWidth: Integer;
procedure SetAscent(const Value: Integer);
procedure SetBeginText(const Value: String);
procedure SetBounds(const Value: TRect);
procedure SetBreakLine(const Value: Boolean);
procedure SetEndText(const Value: String);
procedure SetFontColor(const Value: TColor);
procedure SetFontName(const Value: String);
procedure SetFontSize(const Value: Integer);
procedure SetFontStyle(const Value: TFontStyles);
procedure SetHeight(const Value: Integer);
procedure SetText(const Value: String);
procedure SetWidth(const Value: Integer);
// Public methods
procedure Break(ACanvas: TCanvas; AvailableWidth: Integer);
// Properties
property Ascent: Integer read GetAscent write SetAscent;
property BeginText: String read GetBeginText write SetBeginText;
property Bounds: TRect read GetBounds write SetBounds;
property BreakLine: Boolean read GetBreakLine write SetBreakLine;
property EndText: String read GetEndText write SetEndText;
property FontColor: TColor read GetFontColor write SetFontColor;
property FontName: String read GetFontName write SetFontName;
property FontSize: Integer read GetFontSize write SetFontSize;
property FontStyle: TFontStyles read GetFontStyle write SetFontStyle;
property Height: Integer read GetHeight write SetHeight;
property Text: String read GetText write SetText;
property Width: Integer read GetWidth write SetWidth;
end;
//---------------------------------------------------------------------------
// TcaHTMLElement
//---------------------------------------------------------------------------
TcaHTMLElement = class(TInterfacedObject, IcaHTMLElement)
private
FAscent: Integer;
FBeginText: String;
FBounds: TRect;
FBreakLine: Boolean;
FEndText: String;
FFontColor: TColor;
FFontName: String;
FFontSize: Integer;
FFontStyle: TFontStyles;
FHeight: Integer;
FText: String;
FWidth: Integer;
function GetAscent: Integer;
function GetBeginText: String;
function GetBounds: TRect;
function GetBreakLine: Boolean;
function GetEndText: String;
function GetFontColor: TColor;
function GetFontName: String;
function GetFontSize: Integer;
function GetFontStyle: TFontStyles;
function GetHeight: Integer;
function GetText: String;
function GetWidth: Integer;
procedure SetAscent(const Value: Integer);
procedure SetBeginText(const Value: String);
procedure SetBounds(const Value: TRect);
procedure SetBreakLine(const Value: Boolean);
procedure SetEndText(const Value: String);
procedure SetFontColor(const Value: TColor);
procedure SetFontName(const Value: String);
procedure SetFontSize(const Value: Integer);
procedure SetFontStyle(const Value: TFontStyles);
procedure SetHeight(const Value: Integer);
procedure SetText(const Value: String);
procedure SetWidth(const Value: Integer);
public
procedure Break(ACanvas: TCanvas; AvailableWidth: Integer);
property Ascent: Integer read GetAscent write SetAscent;
property BeginText: String read GetBeginText write SetBeginText;
property Bounds: TRect read GetBounds write SetBounds;
property BreakLine: Boolean read GetBreakLine write SetBreakLine;
property EndText: String read GetEndText write SetEndText;
property FontColor: TColor read GetFontColor write SetFontColor;
property FontName: String read GetFontName write SetFontName;
property FontSize: Integer read GetFontSize write SetFontSize;
property FontStyle: TFontStyles read GetFontStyle write SetFontStyle;
property Height: Integer read GetHeight write SetHeight;
property Text: String read GetText write SetText;
property Width: Integer read GetWidth write SetWidth;
end;
//---------------------------------------------------------------------------
// IcaHTMLElementList
//---------------------------------------------------------------------------
IcaHTMLElementList = interface
['{BA19C11B-22A6-46A8-A945-648AD4AD2ED0}']
// Property methods
function GetItem(Index: Integer): TcaHTMLElement;
procedure SetItem(Index: Integer; const Item: TcaHTMLElement);
// Public methods
function Add(Item: TcaHTMLElement): Integer;
function Extract(Item: TcaHTMLElement): TcaHTMLElement;
function First: TcaHTMLElement;
function IndexOf(Item: TcaHTMLElement): Integer;
function Last: TcaHTMLElement;
function Remove(Item: TcaHTMLElement): Integer;
procedure Insert(Index: Integer; Item: TcaHTMLElement);
// Properties
property Items[Index: Integer]: TcaHTMLElement read GetItem write SetItem;
end;
//---------------------------------------------------------------------------
// IcaHTMLElementStack
//---------------------------------------------------------------------------
IcaHTMLElementStack = interface
['{22A74502-8838-4A61-A267-27CDFD9CF6CE}']
procedure Push(Item: TcaHTMLElement);
function Pop: TcaHTMLElement;
function Peek: TcaHTMLElement;
end;
//---------------------------------------------------------------------------
// TcaHTMLElementList
//---------------------------------------------------------------------------
TcaHTMLElementList = class(TInterfacedObject, IcaList, IcaHTMLElementList, IcaHTMLElementStack)
private
FListBase: IcaList;
function GetItem(Index: Integer): TcaHTMLElement;
procedure SetItem(Index: Integer; const Value: TcaHTMLElement);
public
constructor Create;
function Add(Item: TcaHTMLElement): Integer;
function Extract(Item: TcaHTMLElement): TcaHTMLElement;
function First: TcaHTMLElement;
function IndexOf(Item: TcaHTMLElement): Integer;
function Last: TcaHTMLElement;
function Peek: TcaHTMLElement;
function Pop: TcaHTMLElement;
function Remove(Item: TcaHTMLElement): Integer;
procedure Push(Item: TcaHTMLElement);
procedure Insert(Index: Integer; Item: TcaHTMLElement);
property Items[Index: Integer]: TcaHTMLElement read GetItem write SetItem;
property ListBase: IcaList read FListBase implements IcaList;
end;
//---------------------------------------------------------------------------
// IcaMarkupViewer
//---------------------------------------------------------------------------
IcaMarkupViewer = interface
['{4DAB603A-C02D-4C0C-BABD-8EC67DCDDC20}']
// Property methods
function GetColor: TColor;
function GetLines: TStrings;
function GetMarginLeft: Integer;
function GetMarginRight: Integer;
function GetMarginTop: Integer;
function GetMouseOverElement: TcaHTMLElement;
procedure SetColor(const Value: TColor);
procedure SetLines(const Value: TStrings);
procedure SetMarginLeft(const Value: Integer);
procedure SetMarginRight(const Value: Integer);
procedure SetMarginTop(const Value: Integer);
procedure SetMouseOverElement(const Value: TcaHTMLElement);
// Properties
property Color: TColor read GetColor write SetColor;
property Lines: TStrings read GetLines write SetLines;
property MarginLeft: Integer read GetMarginLeft write SetMarginLeft;
property MarginRight: Integer read GetMarginRight write SetMarginRight;
property MarginTop: Integer read GetMarginTop write SetMarginTop;
property MouseOverElement: TcaHTMLElement read GetMouseOverElement write SetMouseOverElement;
end;
//---------------------------------------------------------------------------
// TcaCustomMarkupViewer
//---------------------------------------------------------------------------
TcaCustomMarkupViewer = class(TCustomControl, IcaMarkupViewer)
private
FBitmap: TBitmap;
FColor: TColor;
FElementStack: IcaHTMLElementStack;
FFrameBottom: Integer;
FFrameTop: Integer;
FLines: TStrings;
FMarginLeft: Integer;
FMarginRight: Integer;
FMarginTop: Integer;
FMouseOverElement: TcaHTMLElement;
FPageBottom: Integer;
FScrollBar: TScrollbar;
FTagStack: IcaHTMLElementStack;
// Property methods
function GetColor: TColor;
function GetLines: TStrings;
function GetMarginLeft: Integer;
function GetMarginRight: Integer;
function GetMarginTop: Integer;
function GetMouseOverElement: TcaHTMLElement;
procedure SetColor(const Value: TColor);
procedure SetLines(const Value: TStrings);
procedure SetMarginLeft(const Value: Integer);
procedure SetMarginRight(const Value: Integer);
procedure SetMarginTop(const Value: Integer);
procedure SetMouseOverElement(const Value: TcaHTMLElement);
// Private methods
function GetElement(Index: Integer): TcaHTMLElement;
function GetElementCount: Integer;
procedure ClearBreakText;
procedure LinesChanged;
procedure LinesChangedEvent(Sender: TObject);
procedure ParseHTML;
procedure RenderHTML;
procedure ScrollViewerEvent(Sender: TObject);
procedure UpdateConstraints;
procedure UpdateElementDimensions;
procedure UpdateMouseOverElement(X, Y: Integer);
// Message handlers
procedure CMMouseEnter(var Message: TMessage); message CM_MOUSEENTER;
procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
protected
procedure CreateWnd; override;
procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
property Color: TColor read GetColor write SetColor;
property Lines: TStrings read GetLines write SetLines;
property MarginLeft: Integer read GetMarginLeft write SetMarginLeft;
property MarginRight: Integer read GetMarginRight write SetMarginRight;
property MarginTop: Integer read GetMarginTop write SetMarginTop;
property MouseOverElement: TcaHTMLElement read GetMouseOverElement write SetMouseOverElement;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure Paint; override;
end;
//---------------------------------------------------------------------------
// TcaMarkupViewer
//---------------------------------------------------------------------------
TcaMarkupViewer = class(TcaCustomMarkupViewer)
public
property MouseOverElement;
published
property Align;
property Anchors;
property Color;
property Constraints;
property Lines;
property MarginLeft;
property MarginRight;
property MarginTop;
property OnMouseMove;
end;
implementation
//---------------------------------------------------------------------------
// TcaHTMLElement
//---------------------------------------------------------------------------
procedure TcaHTMLElement.Break(ACanvas: TCanvas; AvailableWidth: Integer);
var
S: String;
Index: Integer;
Wth: Integer;
begin
ACanvas.Font.Name := FFontName;
ACanvas.Font.Size := FFontSize;
ACanvas.Font.Style := FFontStyle;
ACanvas.Font.Color := FFontColor;
if FBeginText = '' then
S := FText
else
S := FEndText;
if ACanvas.TextWidth(S) <= AvailableWidth then
begin
FBeginText := S;
FEndText := '';
end
else
begin
for Index := Length(S) downto 1 do
begin
if S[Index] = #32 then
begin
Wth := ACanvas.TextWidth(Copy(S, 1, Index));
if Wth <= AvailableWidth then
begin
FBeginText := Copy(S, 1, Index);
FEndText := Copy(S, Index + 1, Length(S));
System.Break;
end;
end;
end;
end;
end;
function TcaHTMLElement.GetAscent: Integer;
begin
Result := FAscent;
end;
function TcaHTMLElement.GetBeginText: String;
begin
Result := FBeginText;
end;
function TcaHTMLElement.GetBounds: TRect;
begin
Result := FBounds;
end;
function TcaHTMLElement.GetBreakLine: Boolean;
begin
Result := FBreakLine;
end;
function TcaHTMLElement.GetEndText: String;
begin
Result := FEndText;
end;
function TcaHTMLElement.GetFontColor: TColor;
begin
Result := FFontColor;
end;
function TcaHTMLElement.GetFontName: String;
begin
Result := FFontName;
end;
function TcaHTMLElement.GetFontSize: Integer;
begin
Result := FFontSize;
end;
function TcaHTMLElement.GetFontStyle: TFontStyles;
begin
Result := FFontStyle;
end;
function TcaHTMLElement.GetHeight: Integer;
begin
Result := FHeight;
end;
function TcaHTMLElement.GetText: String;
begin
Result := FText;
end;
function TcaHTMLElement.GetWidth: Integer;
begin
Result := FWidth;
end;
procedure TcaHTMLElement.SetAscent(const Value: Integer);
begin
FAscent := Value;
end;
procedure TcaHTMLElement.SetBeginText(const Value: String);
begin
FBeginText := Value;
end;
procedure TcaHTMLElement.SetBounds(const Value: TRect);
begin
FBounds := Value;
end;
procedure TcaHTMLElement.SetBreakLine(const Value: Boolean);
begin
FBreakLine := Value;
end;
procedure TcaHTMLElement.SetEndText(const Value: String);
begin
FEndText := Value;
end;
procedure TcaHTMLElement.SetFontColor(const Value: TColor);
begin
FFontColor := Value;
end;
procedure TcaHTMLElement.SetFontName(const Value: String);
begin
FFontName := Value;
end;
procedure TcaHTMLElement.SetFontSize(const Value: Integer);
begin
FFontSize := Value;
end;
procedure TcaHTMLElement.SetFontStyle(const Value: TFontStyles);
begin
FFontStyle := Value;
end;
procedure TcaHTMLElement.SetHeight(const Value: Integer);
begin
FHeight := Value;
end;
procedure TcaHTMLElement.SetText(const Value: String);
begin
FText := Value;
end;
procedure TcaHTMLElement.SetWidth(const Value: Integer);
begin
FWidth := Value;
end;
//---------------------------------------------------------------------------
// TcaHTMLElementList
//---------------------------------------------------------------------------
constructor TcaHTMLElementList.Create;
begin
inherited;
FListBase := TcaList.Create;
end;
function TcaHTMLElementList.Add(Item: TcaHTMLElement): Integer;
begin
Result := FListBase.List.Add(Pointer(Item));
end;
function TcaHTMLElementList.Extract(Item: TcaHTMLElement): TcaHTMLElement;
begin
Result := TcaHTMLElement(FListBase.List.Extract(Pointer(Item)));
end;
function TcaHTMLElementList.First: TcaHTMLElement;
begin
Result := TcaHTMLElement(FListBase.List.First);
end;
function TcaHTMLElementList.GetItem(Index: Integer): TcaHTMLElement;
begin
Result := TcaHTMLElement(FListBase.List.Items[Index]);
end;
function TcaHTMLElementList.IndexOf(Item: TcaHTMLElement): Integer;
begin
Result := FListBase.List.IndexOf(Pointer(Item));
end;
procedure TcaHTMLElementList.Insert(Index: Integer;
Item: TcaHTMLElement);
begin
FListBase.List.Insert(Index, Pointer(Item));
end;
function TcaHTMLElementList.Last: TcaHTMLElement;
begin
Result := TcaHTMLElement(FListBase.List.Last);
end;
function TcaHTMLElementList.Peek: TcaHTMLElement;
begin
if FListBase.Count = 0 then
Result := nil
else
Result := Last;
end;
function TcaHTMLElementList.Pop: TcaHTMLElement;
begin
Result := Peek;
if Result <> nil then
FListBase.Delete(FListBase.Count - 1);
end;
procedure TcaHTMLElementList.Push(Item: TcaHTMLElement);
begin
Add(Item);
end;
function TcaHTMLElementList.Remove(Item: TcaHTMLElement): Integer;
begin
Result := FListBase.List.Remove(Pointer(Item));
end;
procedure TcaHTMLElementList.SetItem(Index: Integer;
const Value: TcaHTMLElement);
begin
FListBase.List.Items[Index] := Pointer(Value);
end;
//---------------------------------------------------------------------------
// TcaCustomMarkupViewer
//---------------------------------------------------------------------------
constructor TcaCustomMarkupViewer.Create(AOwner: TComponent);
begin
inherited;
FElementStack := TcaHTMLElementList.Create;
FTagStack := TcaHTMLElementList.Create;
Width := 300;
Height := 275;
FMarginLeft := 5;
FMarginRight := 5;
FMargintop := 5;
FColor := clWindow;
FLines := TStringList.Create;
TStringList(FLines).OnChange := LinesChangedEvent;
end;
procedure TcaCustomMarkupViewer.CreateWnd;
begin
inherited;
FScrollBar := TScrollBar.create(Self);
FScrollBar.Kind := sbVertical;
FScrollBar.Parent := Self;
FScrollBar.Align := alRight;
FScrollBar.Min := 0;
FScrollBar.Max := 0;
FScrollBar.OnChange := ScrollViewerEvent;
FFrameTop := 0;
FFrameBottom := ClientHeight;
FBitmap := TBitmap.Create;
FBitmap.Width := ClientWidth - FScrollBar.Width;
FBitmap.Height := ClientHeight;
end;
destructor TcaCustomMarkupViewer.Destroy;
begin
FBitmap.Free;
FLines.Free;
inherited;
end;
procedure TcaCustomMarkupViewer.CMMouseEnter(var Message: TMessage);
begin
inherited;
end;
procedure TcaCustomMarkupViewer.CMMouseLeave(var Message: TMessage);
begin
inherited;
FMouseOverElement := nil;
end;
function TcaCustomMarkupViewer.GetColor: TColor;
begin
Result := FColor;
end;
function TcaCustomMarkupViewer.GetLines: TStrings;
begin
Result := FLines;
end;
function TcaCustomMarkupViewer.GetMarginLeft: Integer;
begin
Result := FMarginLeft;
end;
function TcaCustomMarkupViewer.GetMarginRight: Integer;
begin
Result := FMarginRight;
end;
function TcaCustomMarkupViewer.GetMarginTop: Integer;
begin
Result := FMarginTop;
end;
procedure TcaCustomMarkupViewer.ScrollViewerEvent(Sender: TObject);
begin
FFrameTop := FScrollBar.Position;
FFrameBottom := FFrameTop + ClientHeight - 1;
if GetElementCount > 0 then RenderHTML;
UpdateConstraints;
Canvas.Draw(0, 0, FBitmap);
end;
procedure TcaCustomMarkupViewer.UpdateElementDimensions;
var
Index: Integer;
Element: TcaHTMLElement;
ElementStr: String;
TextMetrics: TTextMetric;
begin
for Index := 0 to GetElementCount - 1 do
begin
Element := GetElement(Index);
ElementStr := Element.Text;
Canvas.Font.Name := Element.FontName;
Canvas.Font.Size := Element.FontSize;
Canvas.Font.Style := Element.FontStyle;
Canvas.Font.Color := Element.FontColor;
GetTextMetrics(Canvas.Handle, TextMetrics);
Element.Height := TextMetrics.tmHeight;
Element.Ascent := TextMetrics.tmAscent;
Element.Width := Canvas.TextWidth(ElementStr);
end;
end;
procedure TcaCustomMarkupViewer.ClearBreakText;
var
Index: Integer;
Element: TcaHTMLElement;
begin
for Index := 0 to GetElementCount - 1 do
begin
Element := GetElement(Index);
Element.BeginText := '';
Element.EndText := '';
end;
end;
function TcaCustomMarkupViewer.GetElementCount: Integer;
begin
Result := (FElementStack as IcaList).Count;
end;
function TcaCustomMarkupViewer.GetElement(Index: Integer): TcaHTMLElement;
begin
Result := (FElementStack as IcaHTMLElementList).Items[Index];
end;
function TcaCustomMarkupViewer.GetMouseOverElement: TcaHTMLElement;
begin
Result := FMouseOverElement;
end;
procedure TcaCustomMarkupViewer.Paint;
var
OffPageHeight: Integer;
MathUtils: IcaMathUtils;
begin
MathUtils := Utils as IcaMathUtils;
FBitmap.Width := ClientWidth - FScrollBar.Width;
FBitmap.Height := ClientHeight;
if GetElementCount > 0 then RenderHTML;
UpdateConstraints;
Canvas.Draw(0, 0, FBitmap);
FScrollBar.Min := 0;
OffPageHeight := FPageBottom - ClientHeight;
if OffPageHeight > 0 then
FScrollBar.Max := OffPageHeight
else
FScrollBar.Max := 0;
FScrollBar.Position := 0;
FScrollBar.LargeChange := MathUtils.Trunc(0.8 * ClientHeight);
end;
procedure TcaCustomMarkupViewer.RenderHTML;
var
BaseLine: Integer;
BreakPos: Integer;
Element: TcaHTMLElement;
Index: Integer;
EmtCount: Integer;
IsEndOfLine: Boolean;
LineEnd: Integer;
LineStart: Integer;
MaxAscent: Integer;
MaxHeight: Integer;
PendingBreak: boolean;
R: TRect;
XPos: Integer;
YPos: Integer;
procedure SetFont(AElement: TcaHTMLElement);
begin
FBitmap.Canvas.Font.Name := AElement.FontName;
FBitmap.Canvas.Font.Size := AElement.FontSize;
FBitmap.Canvas.Font.Style := AElement.FontStyle;
FBitmap.Canvas.Font.Color := AElement.FontColor;
end;
procedure RenderString(AElement: TcaHTMLElement);
var
S: String;
Wth: Integer;
Hgt: Integer;
R: TRect;
TextYPos: Integer;
begin
SetFont(AElement);
if AElement.BeginText <> '' then
begin
S := AElement.BeginText;
Wth := FBitmap.Canvas.TextWidth(S);
Hgt := FBitmap.Canvas.TextHeight(S);
TextYPos := YPos + BaseLine - AElement.Ascent - FFrameTop;
FBitmap.Canvas.TextOut(XPos, TextYPos, S);
R := Rect(XPos, TextYPos, XPos + Wth, TextYPos + Hgt);
AElement.Bounds := R;
Inc(XPos, Wth);
end;
end;
begin
LineEnd := 0;
R := Rect(0, 0, FBitmap.Width, FBitmap.Height);
FBitmap.Canvas.Brush.Color := Color;
FBitmap.Canvas.FillRect(R);
ClearBreakText;
FBitmap.Canvas.Brush.Style := bsClear;
YPos := FMarginTop;
LineStart := 0;
PendingBreak := False;
EmtCount := GetElementCount;
repeat
Index := LineStart;
BreakPos := FBitmap.Width - FMarginRight;
MaxHeight := 0;
MaxAscent := 0;
IsEndOfLine := False;
repeat
Element := GetElement(Index);
if Element.BreakLine then
begin
if not PendingBreak then
begin
PendingBreak := True;
IsEndOfLine := True;
LineEnd := Index - 1;
end
else
PendingBreak := False;
end;
if not PendingBreak then
begin
if Element.Height > MaxHeight then MaxHeight := Element.Height;
if Element.Ascent > MaxAscent then MaxAscent := Element.Ascent;
Element.Break(FBitmap.Canvas, BreakPos);
if Element.BeginText <> '' then
begin
BreakPos := BreakPos - FBitmap.Canvas.TextWidth(Element.BeginText);
if Element.EndText = '' then
begin
if Index >= EmtCount - 1 then
begin
IsEndOfLine := True;
LineEnd := Index;
end
else
begin
Inc(Index);
end
end
else
begin
IsEndOfLine := True;
LineEnd := Index;
end;
end
else
begin
IsEndOfLine := True;
LineEnd := Index;
end;
end;
until IsEndOfLine;
XPos := FMarginLeft;
BaseLine := MaxAscent;
if (YPos + MaxHeight >= FFrameTop) and (YPos <= FFrameBottom) then
for Index := LineStart to LineEnd do
begin
Element := GetElement(Index);
RenderString(Element);
end;
YPos := YPos + MaxHeight;
if not Pendingbreak then
LineStart := LineEnd
else
LineStart := LineEnd + 1;
until (LineEnd >= EmtCount - 1) and (Element.EndText = '');
FPageBottom := YPos;
end;
procedure TcaCustomMarkupViewer.ParseHTML;
var
AText: String;
BreakLine: boolean;
Element: TcaHTMLElement;
ElementColor: TColor;
ElementText: String;
FontColor: TColor;
FontName: String;
FontSize: Integer;
FontStyle: TFontStyles;
TagPos: Integer;
procedure PushTag;
begin
Element := TcaHTMLElement.Create;
Element.FontName := FontName;
Element.FontSize := FontSize;
Element.FontStyle := FontStyle;
Element.FontColor := FontColor;
FTagStack.Push(Element);
end;
procedure PopTag;
begin
Element := FTagStack.Pop;
if Element <> nil then
begin
FontName := Element.FontName;
FontSize := Element.FontSize;
FontStyle := Element.FontStyle;
FontColor := Element.FontColor;
Element.Free;
end;
end;
procedure PushElement;
begin
Element := TcaHTMLElement.Create;
Element.Text := ElementText;
Element.FontName := FontName;
Element.FontSize := FontSize;
Element.FontStyle := FontStyle;
Element.FontColor := FontColor;
Element.BreakLine := BreakLine;
BreakLine := False;
FElementStack.Push(Element);
end;
procedure ParseTag(ParseText: String);
var
HasParams: Boolean;
OldFontSize: Integer;
P: Integer;
Param: String;
S: String;
TagStr: String;
TagValue: String;
begin
S := Trim(ParseText);
HasParams := False;
P := Pos(' ', S);
if P = 0 then
TagStr := S // tag only
else
begin // tag + attributes
TagStr := Copy(S, 1, P - 1);
S := Trim(Copy(S, P + 1, length(S)));
HasParams := True;
end;
// handle TagStr
TagStr := Lowercase(TagStr);
if TagStr = 'br' then
BreakLine := True
else if TagStr = 'b' then
begin // bold
PushTag;
FontStyle := FontStyle + [fsbold];
end
else if TagStr = '/b' then
begin // cancel bold
FontStyle := FontStyle - [fsbold];
PopTag;
end
else if TagStr = 'i' then
begin // italic
PushTag;
FontStyle := FontStyle + [fsitalic];
end
else if TagStr = '/i' then
begin // cancel italic
FontStyle := FontStyle - [fsitalic];
PopTag;
end
else if TagStr = 'u' then
begin // underline
PushTag;
FontStyle := FontStyle + [fsunderline];
end
else if TagStr = '/u' then
begin // cancel underline
FontStyle := FontStyle - [fsunderline];
PopTag;
end
else if TagStr = 'font' then
begin
PushTag;
end
else if TagStr = '/font' then
begin
PopTag
end;
if HasParams then
begin
repeat
P := Pos('="', S);
if P > 0 then
begin
Param := lowercase(Trim(Copy(S, 1, P - 1)));
delete(S, 1, P + 1);
P := Pos('"', S);
if P > 0 then
begin
TagValue := Copy(S, 1, P - 1);
Delete(S, 1, P);
if Param = 'face' then
begin
FontName := TagValue;
end
else if Param = 'size' then
begin
OldFontSize := FontSize;
FontSize := StrToIntDef(TagValue, -1);
if FontSize = -1 then FontSize := OldFontSize;
end
else if Param = 'color' then
begin
ElementColor := Utils.HTMLColorToColor(TagValue);
if ElementColor <> clNone then
FontColor := ElementColor;
end;
end;
end;
until P = 0;
end;
end;
begin
AText := TrimRight(StringReplace(FLines.Text, #13#10, ' ', [rfReplaceAll]));
(FElementStack as IcaList).Clear;
(FTagStack as IcaList).Clear;
FontStyle := [];
FontName := 'Arial';
FontSize := 12;
FontColor := clWindowText;
BreakLine := False;
repeat
TagPos := Pos('<', AText);
if TagPos = 0 then
begin
ElementText := AText;
PushElement;
end
else
begin
if TagPos > 1 then
begin
ElementText := Copy(AText, 1, TagPos - 1);
PushElement;
Delete(AText, 1, TagPos - 1);
end;
TagPos := Pos('>', AText);
if TagPos > 0 then
begin
ParseTag(Copy(AText, 2, TagPos - 2));
Delete(AText, 1, TagPos);
end;