source: trunk/Packages/lazbarcodes/demo/main.pas

Last change on this file was 123, checked in by chronos, 4 years ago
  • Added: QR code image visible in contact others tab. It can be saved as image to file.
File size: 19.3 KB
Line 
1unit main;
2
3{$mode objfpc}{$H+}
4
5interface
6
7uses
8 Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ComCtrls, ExtCtrls,
9 StdCtrls, Spin, Buttons, ExtDlgs, ubarcodes;
10
11type
12
13 { TMainForm }
14
15 TMainForm = class(TForm)
16 BarcodesTree: TTreeView;
17 btnSaveToFile: TBitBtn;
18 btnCopyToClipboard: TBitBtn;
19 btnFont: TButton;
20 cbHumanReadableText: TCheckBox;
21 cbAddChecksum: TCheckBox;
22 cbDisplayChecksum: TCheckBox;
23 cbAutoSize: TCheckBox;
24 cbRecommendedSymbolSize: TCheckBox;
25 clbColor: TColorButton;
26 clbForeground: TColorButton;
27 cmbBearerBarsBox: TComboBox;
28 clbBackground: TColorButton;
29 edText: TEdit;
30 FontDialog: TFontDialog;
31 gbGeometry: TGroupBox;
32 gbShow: TGroupBox;
33 gbChecksum: TGroupBox;
34 gbColors: TGroupBox;
35 lblWhiteSpaceWidth: TLabel;
36 lblScale: TLabel;
37 lblError: TLabel;
38 lblMargin: TLabel;
39 lblText: TLabel;
40 lblSymbolHeight: TLabel;
41 nbOptions: TNotebook;
42 pgOptions_Plessey: TPage;
43 pgOptions_QR: TPage;
44 Panel1: TPanel;
45 Panel2: TPanel;
46 BarcodePanel: TPanel;
47 rgPlessey_Checkchar: TRadioGroup;
48 rgQR_ECCLevel: TRadioGroup;
49 SaveDialog1: TSaveDialog;
50 seWhiteSpaceWidth: TSpinEdit;
51 seScale: TSpinEdit;
52 seMargin: TSpinEdit;
53 seSymbolHeight: TSpinEdit;
54 btnSampleText: TSpeedButton;
55 Splitter1: TSplitter;
56 procedure BarcodeChange(Sender: TObject);
57 procedure BarcodesTreeChange(Sender: TObject; Node: TTreeNode);
58 procedure BarcodesTreeCustomDrawItem(Sender: TCustomTreeView;
59 Node: TTreeNode; {%H-}State: TCustomDrawState; var DefaultDraw: Boolean);
60 procedure btnCopyToClipboardClick(Sender: TObject);
61 procedure btnFontClick(Sender: TObject);
62 procedure btnSampleTextClick(Sender: TObject);
63 procedure btnSaveToFileClick(Sender: TObject);
64 procedure cbAutoSizeChange(Sender: TObject);
65 procedure cbRecommendedSymbolSizeChange(Sender: TObject);
66 procedure edTextChange(Sender: TObject);
67 procedure FormCreate(Sender: TObject);
68 procedure rgPlessey_CheckcharClick(Sender: TObject);
69 procedure rgQR_ECCLevelClick(Sender: TObject);
70 procedure SaveDialogTypeChange(Sender: TObject);
71 private
72 FBarCode: TLazBarcodeCustomText;
73 FFileName: String;
74 procedure PopulateBarcodesTree;
75 procedure SelectBarCode(ANode: TTreeNode);
76 procedure UpdateErrorMsg;
77
78 public
79
80 end;
81
82var
83 MainForm: TMainForm;
84
85implementation
86
87{$R *.lfm}
88
89uses
90 TypInfo;
91
92type
93 TLazBarcodeClass = class of TLazBarcodeCustomText;
94 TBarcodeAccess = class(TLazBarcodeCustomText);
95 TSimpleBarcodeAccess = class(TSimpleBarcode);
96
97{ We must register all barcode classes because barcodes will be created in this
98 application based on a string containing the class name. }
99procedure RegisterBarcodes;
100begin
101 RegisterClass(TBarcodeC11);
102 RegisterClass(TBarcodeC128);
103 RegisterClass(TBarcode2of5);
104 RegisterClass(TBarcode3of9);
105 RegisterClass(TBarcodeEAN);
106 RegisterClass(TBarcodeChannelCode);
107 RegisterClass(TBarcodePlessey);
108 RegisterClass(TBarcodeTelepen);
109 RegisterClass(TBarcodeMedical);
110 RegisterClass(TBarcodePostal);
111 RegisterClass(TBarcodePDF417);
112
113 RegisterClass(TBarcodeQR);
114 RegisterClass(TBarcodeMicroQR);
115 RegisterClass(TBarcodeAztec);
116 RegisterClass(TBarcodeAztecRune);
117 RegisterClass(TBarcodeDatamatrix);
118end;
119
120
121{ TMainForm }
122
123procedure TMainForm.BarcodeChange(Sender: TObject);
124begin
125 if FBarcode = nil then
126 exit;
127
128 if Sender = seScale then
129 TBarcodeAccess(FBarcode).Scale := seScale.Value
130 else
131 if Sender = seMargin then
132 TBarcodeAccess(FBarcode).Margin := seMargin.Value
133 else
134 if Sender = seWhiteSpaceWidth then
135 TBarcodeAccess(FBarcode).WhiteSpaceWidth := seWhiteSpaceWidth.Value
136 else
137 if Sender = seSymbolHeight then
138 TBarcodeAccess(FBarcode).SymbolHeight := seSymbolHeight.Value
139 else
140 if (Sender = cmbBearerBarsBox) then
141 TBarcodeAccess(FBarcode).BearerBarMode := TBarcodeBearerBarMode(cmbBearerBarsBox.ItemIndex)
142 else
143 if Sender = clbColor then
144 TBarcodeAccess(FBarcode).Color := clbColor.ButtonColor
145 else
146 if Sender = clbBackground then
147 TBarcodeAccess(FBarcode).BackgroundColor := clbBackground.ButtonColor
148 else
149 if Sender = clbForeground then
150 TBarcodeAccess(FBarcode).ForegroundColor := clbForeground.ButtonColor
151 else
152 if (Sender = cbHumanReadableText) and (FBarcode is TCustomBarcode) then
153 TBarcodeAccess(FBarcode).ShowHumanReadableText := cbHumanReadableText.Checked
154 else
155 if (Sender = cbAddChecksum) and (FBarcode is TSimpleBarcode) then
156 begin
157 TSimpleBarcodeAccess(FBarcode).AddChecksum := cbAddChecksum.Checked;
158 cbDisplayChecksum.Enabled := cbAddChecksum.Checked;
159 end
160 else
161 if (Sender = cbDisplayChecksum) and (FBarcode is TSimpleBarcode) then
162 TSimpleBarcodeAccess(FBarcode).DisplayChecksum := cbDisplayChecksum.Checked;
163end;
164
165procedure TMainForm.btnSampleTextClick(Sender: TObject);
166begin
167 if FBarCode <> nil then
168 begin
169 FBarcode.SampleText;
170 edText.Text := FBarcode.Text;
171 end;
172end;
173
174procedure TMainForm.BarcodesTreeChange(Sender: TObject; Node: TTreeNode);
175begin
176 SelectBarcode(Node);
177end;
178
179procedure TMainForm.BarcodesTreeCustomDrawItem(Sender: TCustomTreeView;
180 Node: TTreeNode; State: TCustomDrawState; var DefaultDraw: Boolean);
181begin
182 if (Node.HasChildren) or (Node.Level = 0) then
183 Sender.Canvas.Font.Style := [fsBold]
184 else
185 Sender.Canvas.Font.Style := [];
186 DefaultDraw := true;
187end;
188
189procedure TMainForm.btnCopyToClipboardClick(Sender: TObject);
190begin
191 FBarcode.CopyToClipboard;
192end;
193
194procedure TMainForm.btnFontClick(Sender: TObject);
195begin
196 FontDialog.Font.Assign(FBarcode.Font);
197 if FontDialog.Execute then
198 FBarcode.Font.Assign(FontDialog.Font);
199end;
200
201procedure TMainForm.btnSaveToFileClick(Sender: TObject);
202begin
203 with TSaveDialog.Create(self) do
204 try
205 Filter := 'Windows bitmap files (*.bmp)|*.bmp|' +
206 'Portable network graphic files (*.png)|*.png|' +
207 'JPEG image files (*.jpg;*.jpeg)|*.jpg;*.jpeg|' +
208 'TIFF image files (*.tiff; *.tif)|*.tiff;*.tif|'+
209 'XPM image files (*.xpm)|*.xpm|' +
210 'Scalable vector graphics files (*.svg)|*.svg|'+
211 'Encapsulated PostScript files (*.eps;*.ps)|*.eps;*.ps|'+
212 'All files (*.*)|*.*';
213 FilterIndex := 2;
214 DefaultExt := '.png';
215 InitialDir := ExtractFileName(FFileName);
216 OnTypeChange := @SaveDialogTypeChange;
217 if Execute then
218 begin
219 FFileName := FileName;
220 case lowercase(ExtractFileExt(FFileName)) of
221 '.bmp':
222 FBarcode.SaveToFile(FFileName, TBitmap);
223 '.png':
224 FBarcode.SaveToFile(FFileName, TPortableNetworkGraphic);
225 '.jpg', '.jpeg':
226 FBarcode.SaveTofile(FFileName, TJpegImage);
227 '.tif', '.tiff':
228 FBarcode.SaveToFile(FFileName, TTiffImage);
229 '.xpm':
230 FBarcode.SaveToFile(FFileName, TPixmap);
231 '.svg':
232 FBarcode.SaveToSvgFile(FFileName);
233 '.eps', '.ps':
234 Fbarcode.SaveToEpsFile(FFileName);
235 else
236 raise Exception.Create('Image type not supported.');
237 end;
238 end;
239 finally
240 Free;
241 end;
242end;
243
244procedure TMainForm.cbAutoSizeChange(Sender: TObject);
245begin
246 if Assigned(FBarcode) then
247 begin
248 FBarcode.AutoSize := cbAutoSize.Checked;
249 if FBarcode.AutoSize then
250 begin
251 FBarcode.Align := alNone;
252 FBarcode.AnchorSideLeft.Control := FBarcode.Parent;
253 FBarcode.AnchorSideLeft.Side := asrCenter;
254 FBarcode.AnchorSideTop.Control := FBarcode.Parent;
255 FBarcode.AnchorSideTop.Side := asrCenter;
256 end else
257 begin
258 FBarcode.AnchorSideLeft.Control := nil;
259 FBarcode.AnchorSideTop.Control := nil;
260 FBarcode.Align := alClient;
261 end;
262 end;
263end;
264
265procedure TMainForm.cbRecommendedSymbolSizeChange(Sender: TObject);
266begin
267 seScale.Enabled := not cbRecommendedSymbolSize.Checked;
268 lblScale.Enabled := seScale.Enabled;
269 seMargin.Enabled := not cbRecommendedSymbolSize.Checked;
270 lblMargin.Enabled := seMargin.Enabled;
271 seWhitespaceWidth.Enabled := not cbRecommendedSymbolSize.Checked and IsPublishedProp(FBarcode, 'WhiteSpaceWidth');
272 lblWhitespaceWidth.Enabled := seWhitespaceWidth.Enabled;
273 seSymbolHeight.Enabled := not cbRecommendedSymbolSize.Checked and IsPublishedProp(FBarcode, 'SymbolHeight');
274 lblSymbolHeight.Enabled := seSymbolHeight.Enabled;
275 cmbBearerBarsBox.Enabled := not cbRecommendedSymbolSize.Checked and IsPublishedProp(FBarcode, 'BearerBarMode');
276 if FBarcode is TSimpleBarcode then
277 begin
278 TSimpleBarcode(FBarcode).RecommendedSymbolSize := cbRecommendedSymbolSize.Checked;
279 if not cbRecommendedSymbolSize.Checked then
280 begin
281 TSimpleBarcode(FBarcode).Scale := seScale.Value;
282 TSimpleBarcodeAccess(FBarcode).SymbolHeight := seSymbolHeight.Value;
283 TSimpleBarcode(FBarcode).Margin := seMargin.Value;
284 TSimpleBarcodeAccess(FBarcode).WhitespaceWidth := seWhiteSpaceWidth.Value;
285 TSimpleBarcodeAccess(FBarcode).BearerBarMode := TBarcodeBearerBarMode(cmbBearerBarsBox.ItemIndex);
286 end;
287 end else
288 if FBarcode is TBarcodePDF417 then
289 begin
290 seSymbolHeight.Enabled := not cbRecommendedSymbolSize.Checked;
291 lblSymbolHeight.Enabled := seSymbolHeight.Enabled;
292 end;
293end;
294
295procedure TMainForm.FormCreate(Sender: TObject);
296begin
297 nbOptions.PageIndex := -1;
298 PopulateBarcodesTree;
299end;
300
301procedure TMainForm.rgPlessey_CheckcharClick(Sender: TObject);
302begin
303 if FBarcode is TBarcodePlessey then
304 TBarcodePlessey(FBarcode).CheckChar := TPlesseyCheckChar(rgPlessey_CheckChar.ItemIndex);
305end;
306
307procedure TMainForm.rgQR_ECCLevelClick(Sender: TObject);
308begin
309 if FBarcode is TBarcodeQR then
310 TBarcodeQR(FBarcode).ECCLevel := TBarcodeQR_ECCLevel(rgQR_ECCLevel.ItemIndex);
311end;
312
313procedure TMainForm.SaveDialogTypeChange(Sender: TObject);
314var
315 dlg: TSaveDialog;
316 L: TStrings;
317 idx: Integer;
318begin
319 dlg := Sender as TSaveDialog;
320 L := TStringList.Create;
321 try
322 L.StrictDelimiter := true;
323 L.Delimiter := '|';
324 L.DelimitedText := dlg.Filter;
325 idx := (dlg.FilterIndex - 1) * 2 + 1;
326 dlg.DefaultExt := ExtractfileExt(L[idx]);
327 finally
328 L.Free;
329 end;
330end;
331
332procedure TMainForm.edTextChange(Sender: TObject);
333begin
334 FBarcode.Text := edText.Text;
335 UpdateErrorMsg;
336end;
337
338procedure TMainForm.PopulateBarcodesTree;
339var
340 node, child: TTreeNode;
341begin
342 with BarcodesTree do begin
343 Items.BeginUpdate;
344 try
345 Items.Clear;
346
347 node := Items.AddChild(nil, '1-dimensional barcodes');
348 child := Items.AddChildObject(node, 'Code 11', PChar('TBarcodeC11'));
349 child := Items.AddChildObject(node, 'Code 128 and related', PChar('TBarcodeC128'));
350 Items.AddChildObject(child, 'Code-128', Pointer(PtrInt(bctCode128)));
351 Items.AddChildObject(child, 'EAN-128', Pointer(PtrInt(bctEAN128)));
352 child := Items.AddChildObject(node, '2-of-5 codes', PChar('TBarcode2of5'));
353 Items.AddChildObject(child, 'Standard 2-of-5', Pointer(PtrInt(bctCode25Standard)));
354 Items.AddChildObject(child, 'Data Logic 2-of-5', Pointer(PtrInt(bctCode25DataLogic)));
355 Items.AddChildObject(child, 'IATA 2-of-5', Pointer(PtrInt(bctCode25IATA)));
356 Items.AddChildObject(child, 'Industrial 2-of-5', Pointer(PtrInt(bctCode25Industrial)));
357 Items.AddChildObject(child, 'Interleaved 2-of-5', Pointer(PtrInt(bctCode25Interleaved)));
358 Items.AddChildObject(child, 'ITF-14', Pointer(PtrInt(bctITF14)));
359 child := Items.AddChildObject(node, '3-of-9 codes', PChar('TBarcode3of9'));
360 Items.AddChildObject(child, 'Code 3-of-9 (C39)', Pointer(ptrInt(bctCode39)));
361 Items.AddChildObject(child, 'Code 3-of-9 extended (C39+)', Pointer(PtrInt(bctCode39Ext)));
362 Items.AddChildObject(child, 'LOGMARS', Pointer(PtrInt(bctLOGMARS)));
363 Items.AddChildObject(child, 'Code 93', Pointer(PtrInt(bctCode93)));
364 child := Items.AddChildObject(node, 'Channel code', PChar('TBarcodeChannelCode'));
365 child := Items.AddChildObject(node, 'UPC/EAN codes', PChar('TBarcodeEAN'));
366 Items.AddChildObject(child, 'EAN-8, EAN-13', Pointer(PtrInt(bctEAN)));
367 Items.AddChildObject(child, 'EAN-14', Pointer(PtrInt(bctEAN14)));
368 Items.AddChildObject(child, 'ISBN', Pointer(PtrInt(bctISBN)));
369 Items.AddChildObject(child, 'NVE-18', Pointer(PtrInt(bctNVE18)));
370 Items.AddChildObject(child, 'UPC-A', Pointer(PtrInt(bctUPCA)));
371 Items.AddChildObject(child, 'UPC-E', Pointer(PtrInt(bctUPCE)));
372 child := Items.AddChildObject(node, 'MSI/Plessey', PChar('TBarcodePlessey'));
373 Items.AddChildObject(child, 'Plessey', Pointer(PtrInt(bctPlessey)));
374 Items.AddChildObject(child, 'MSI/Plessey', Pointer(PtrInt(bctMSIPlessey)));
375 child := Items.AddChildObject(node, 'Telepen', PChar('TBarcodeTelepen'));
376 Items.AddChildObject(child, 'Telepen', Pointer(PtrInt(bctTelepen)));
377 Items.AddChildObject(child, 'Telepen numeric', Pointer(PtrInt(bctTelepenNum)));
378 child := Items.AddChildObject(node, 'Medical/pharmaceutical', PChar('TBarcodeMedical'));
379 Items.AddChildObject(child, 'CodaBar', Pointer(PtrInt(bctCodaBar)));
380 Items.AddChildObject(child, 'Code32', Pointer(PtrInt(bctCode32)));
381 Items.AddChildObject(child, 'Pharma one-track', Pointer(PtrInt(bctPharmaOne)));
382 Items.AddChildObject(child, 'Pharma two-track', Pointer(PtrInt(bctPharmaTwo)));
383 Items.AddChildObject(child, 'Pharmazentralnummer (7-digit)', Pointer(PtrInt(bctPZN7)));
384 Items.AddChildObject(child, 'Pharmazentralnummer (8-digit)', Pointer(PtrInt(bctPZN8)));
385 child := Items.AddChildObject(node, 'Postal barcodes', PChar('TBarcodePostal'));
386 Items.AddChildObject(child, 'Australia Post Customer', Pointer(PtrInt(bctAustraliaPostCustomer)));
387 Items.AddChildObject(child, 'Australia Post Reply Paid', Pointer(PtrInt(bctAustraliaPostReplyPaid)));
388 Items.AddChildObject(child, 'Australia Post Routing', Pointer(PtrInt(bctAustraliaPostRoute)));
389 Items.AddChildObject(child, 'Australia Post Redirection', Pointer(PtrInt(bctAustraliaPostRedirect)));
390 Items.AddChildObject(child, 'DAFT', Pointer(PtrInt(bctDaft)));
391 Items.AddChildObject(child, 'Deutsche Post IdentCode', Pointer(PtrInt(bctDeutschePostIdentCode)));
392 Items.AddChildObject(child, 'Deutsche Post LeitCode', Pointer(PtrInt(bctDeutschePostLeitCode)));
393 Items.AddChildObject(child, 'FIM (Face Identification Mark)', Pointer(PtrInt(bctFIM)));
394 Items.AddChildObject(child, 'Japanese Post', Pointer(PtrInt(bctJapanPost)));
395 Items.AddChildObject(child, 'KIX', Pointer(PtrInt(bctKix)));
396 Items.AddChildObject(child, 'Korea Post', Pointer(PtrInt(bctKoreaPost)));
397 Items.AddChildObject(child, 'Planet', Pointer(PtrInt(bctPlanet)));
398 Items.AddChildObject(child, 'PostNet', Pointer(PtrInt(bctPostNet)));
399 Items.AddChildObject(child, 'Royal Mail RM4SCC', Pointer(PtrInt(bctRM4SCC)));
400
401 node := Items.AddChild(nil, '2-dimensional barcodes');
402 child := Items.AddChildObject(node, 'QR Code', PChar('TBarcodeQR'));
403 child := Items.AddChildObject(node, 'Micro QR', PChar('TBarcodeMicroQR'));
404 child := Items.AddChildObject(node, 'Aztec', PChar('TBarcodeAztec'));
405 child := Items.AddChildObject(node, 'Aztec Rune', PChar('TBarcodeAztecRune'));
406 child := Items.AddChildObject(node, 'Data Matrix', PChar('TBarcodeDataMatrix'));
407 child := Items.AddChildObject(node, 'PDF417 variants', PChar('TBarcodePDF417'));
408 Items.AddChildObject(child, 'PDF417', Pointer(PtrInt(bctPDF417)));
409 Items.AddChildObject(child, 'Compact PDF417', Pointer(PtrInt(bctPDF417trunc)));
410 Items.AddChildObject(child, 'MicroPDF417 (ISO 24728)', Pointer(PtrInt(bctMicroPDF417)));
411
412 FullExpand;
413 finally
414 Items.EndUpdate;
415 end;
416 end;
417end;
418
419procedure TMainForm.SelectBarcode(ANode: TTreeNode);
420var
421 barcodeClassName: String;
422 barcodeClass: TLazBarcodeClass;
423 barcodeType: Integer;
424begin
425 if (ANode = nil) then
426 begin
427 if FBarcode <> nil then FBarcode.Hide;
428 exit;
429 end;
430
431 FreeAndNil(FBarcode);
432
433 // Determine from the node's Data field the class of the barcode to be created
434 // and/or the value of the BarcodeType property.
435 if (ANode.Level = 1) and not ANode.HasChildren then
436 barcodeClassName := PChar(ANode.Data)
437 else
438 if (ANode.Level = 2) then
439 begin
440 barcodeClassName := PChar(ANode.Parent.Data);
441 barcodeType := {%H-}PtrInt(ANode.Data);
442 end else
443 begin
444 if FBarcode <> nil then FBarcode.Hide;
445 exit;
446 end;
447
448 // Create barcode from information provided in the node's Data field.
449 barcodeClass := TLazBarcodeClass(GetClass(barcodeClassName));
450 FBarcode := barcodeClass.Create(self);
451 FBarcode.Parent := BarcodePanel;
452
453 // Apply general properties
454 FBarcode.Text := edText.Text;
455 TBarcodeAccess(FBarcode).Color := clbColor.ButtonColor;
456 TBarcodeAccess(FBarcode).BackgroundColor := clbBackground.ButtonColor;
457 TBarcodeAccess(FBarcode).ForegroundColor := clbForeground.ButtonColor;
458 TBarcodeAccess(FBarcode).Scale := seScale.Value;
459 TBarcodeAccess(FBarcode).Margin := seMargin.Value;
460 TBarcodeAccess(FBarcode).WhiteSpaceWidth := seWhitespaceWidth.Value;
461 TBarcodeAccess(FBarcode).BearerBarMode := TBarcodeBearerBarMode(cmbBearerBarsBox.ItemIndex);
462 TBarcodeAccess(FBarcode).SymbolHeight := seSymbolHeight.Value;
463 TBarcodeAccess(FBarcode).RecommendedSymbolSize := cbRecommendedSymbolSize.Checked;
464
465 // Apply specific properties for each barcode class - not very elegant...
466 if (FBarcode is TCustomBarcode) then
467 TBarcodeAccess(FBarcode).ShowHumanReadableText := cbHumanReadableText.Checked;
468
469 if (FBarcode is TSimpleBarCode) then
470 begin
471 TSimpleBarcodeAccess(FBarcode).AddChecksum := cbAddChecksum.Checked;
472 cbAddChecksum.Enabled := IsPublishedProp(FBarcode, 'AddChecksum');
473 TSimpleBarcodeAccess(FBarcode).DisplayChecksum := cbDisplayChecksum.Checked;
474 cbDisplayChecksum.Enabled := cbAddChecksum.Checked and IsPublishedProp(FBarcode, 'DisplayChecksum');
475 if (ANode.Level = 2) then
476 TSimpleBarcodeAccess(FBarcode).BarcodeType := TBarcodeType(barcodeType);
477 end;
478
479 cbAutoSizeChange(nil);
480
481 // Show options page corresponding to the selected barcode type.
482 if (FBarcode is TBarcodePlessey) and (TBarcodePlessey(FBarcode).BarcodeType = bctMSIPlessey) then
483 nbOptions.PageIndex := pgOptions_Plessey.PageIndex
484 else
485 if (FBarcode is TBarcodeQR) then
486 nbOptions.PageIndex := pgOptions_QR.PageIndex
487 else
488 nbOptions.PageIndex := -1;
489
490 // Enable/disable GUI components
491 cbHumanReadableText.Enabled := not ((FBarcode is TBarcodeSquare) or (FBarcode is TBarcodePDF417));
492 btnFont.Enabled := cbHumanReadableText.Enabled;
493 seWhiteSpaceWidth.Enabled := IsPublishedProp(FBarcode, 'WhiteSpaceWidth') and not cbRecommendedSymbolSize.Checked;
494 lblWhitespaceWidth.Enabled := seWhiteSpaceWidth.Enabled;
495 if FBarcode is TBarcodePDF417 then
496 begin
497 seSymbolHeight.Enabled := not cbRecommendedSymbolSize.Checked;
498 lblSymbolHeight.Caption := 'Row height ratio';
499 end else
500 begin
501 seSymbolHeight.Enabled := not cbRecommendedSymbolSize.Checked and IsPublishedProp(FBarcode, 'SymbolHeight');
502 lblSymbolHeight.Caption := 'Symbol height';
503 end;
504 lblSymbolHeight.Enabled := seSymbolHeight.Enabled;
505
506 // Show error message from rendering, if available.
507 UpdateErrorMsg;
508end;
509
510procedure TMainForm.UpdateErrorMsg;
511begin
512 lblError.Visible := FBarcode.ErrorString <> '';
513 lblError.Caption := FBarcode.ErrorString;
514 if FBarcode <> nil then
515 FBarcode.Visible := not lblError.Visible;
516end;
517
518initialization
519 RegisterBarcodes;
520
521end.
522
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