1 | unit UDataFile;
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2 |
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3 | {$mode delphi}
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4 |
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5 | interface
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6 |
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7 | uses
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8 | Classes, SysUtils, fgl;
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9 |
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10 | type
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11 | { TDataFile }
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12 |
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13 | TDataFile = class
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14 | private
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15 | FFileName: string;
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16 | FModified: Boolean;
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17 | FOnModify: TNotifyEvent;
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18 | procedure SetFileName(AValue: string);
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19 | procedure SetModified(AValue: Boolean);
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20 | procedure DoOnModify;
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21 | public
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22 | function GetFileExt: string; virtual;
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23 | function GetFileName: string; virtual;
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24 | function GetFileFilter: string; virtual;
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25 | procedure LoadFromFile(FileName: string); virtual;
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26 | procedure SaveToFile(FileName: string); virtual;
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27 | constructor Create; virtual;
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28 | property FileName: string read FFileName write SetFileName;
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29 | property Modified: Boolean read FModified write SetModified;
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30 | property OnModify: TNotifyEvent read FOnModify write FOnModify;
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31 | end;
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32 |
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33 | TDataFileClass = class of TDataFile;
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34 |
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35 | TDataFiles = class(TFPGObjectList<TDataFile>)
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36 | end;
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37 |
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38 |
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39 | implementation
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40 |
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41 | resourcestring
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42 | SDataFileName = 'File';
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43 | SAllFiles = 'All files';
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44 |
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45 | { TDataFile }
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46 |
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47 | procedure TDataFile.SetModified(AValue: Boolean);
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48 | begin
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49 | if FModified = AValue then Exit;
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50 | FModified := AValue;
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51 | DoOnModify;
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52 | end;
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53 |
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54 | procedure TDataFile.DoOnModify;
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55 | begin
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56 | if Assigned(FOnModify) then FOnModify(Self);
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57 | end;
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58 |
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59 | function TDataFile.GetFileExt: string;
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60 | begin
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61 | Result := '.dat';
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62 | end;
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63 |
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64 | function TDataFile.GetFileName: string;
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65 | begin
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66 | Result := SDataFileName;
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67 | end;
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68 |
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69 | function TDataFile.GetFileFilter: string;
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70 | begin
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71 | Result := SAllFiles + '|*.*';
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72 | end;
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73 |
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74 | procedure TDataFile.LoadFromFile(FileName: string);
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75 | begin
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76 | FModified := False;
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77 | Self.FileName := FileName;
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78 | end;
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79 |
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80 | procedure TDataFile.SaveToFile(FileName: string);
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81 | begin
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82 | Self.FileName := FileName;
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83 | FModified := False;
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84 | end;
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85 |
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86 | constructor TDataFile.Create;
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87 | begin
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88 | FileName := GetFileName + GetFileExt;
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89 | end;
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90 |
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91 | procedure TDataFile.SetFileName(AValue: string);
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92 | begin
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93 | if FFileName = AValue then Exit;
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94 | FFileName := AValue;
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95 | end;
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96 |
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97 |
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98 | end.
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99 |
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