1 | unit VAClasses;
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2 |
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3 | interface
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4 |
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5 | uses
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6 | Windows, Controls, Classes, SysUtils, Types, RTLConsts;
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7 |
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8 | type
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9 | TVABaseMethodList = class(TObject)
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10 | strict private
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11 | FCode: TList;
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12 | FData: TList;
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13 | strict protected
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14 | function GetMethod(index: integer): TMethod;
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15 | property Code: TList read FCode;
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16 | property Data: TList read FData;
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17 | protected
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18 | constructor Create; virtual;
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19 | function IndexOf(const Method: TMethod): integer;
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20 | procedure Add(const Method: TMethod);
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21 | procedure Clear;
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22 | function Count: integer;
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23 | procedure Delete(index: integer);
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24 | procedure Remove(const Method: TMethod);
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25 | property Methods[index: integer]: TMethod read GetMethod; default;
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26 | public
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27 | destructor Destroy; override;
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28 | end;
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29 |
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30 | TVAMethodList = class(TVABaseMethodList)
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31 | public
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32 | constructor Create; override;
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33 | destructor Destroy; override;
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34 | function IndexOf(const Method: TMethod): integer;
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35 | procedure Add(const Method: TMethod);
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36 | procedure Clear;
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37 | function Count: integer;
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38 | procedure Delete(index: integer);
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39 | procedure Remove(const Method: TMethod);
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40 | property Methods;
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41 | end;
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42 |
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43 |
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44 | TVALinkedMethodList = class(TVABaseMethodList)
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45 | private
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46 | FLinkedObjects: TList;
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47 | public
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48 | constructor Create; override;
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49 | destructor Destroy; override;
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50 | procedure Add(Obj: TObject; const Method: TMethod);
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51 | function IndexOf(const obj: TObject): integer;
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52 | procedure Clear;
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53 | function Count: integer;
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54 | procedure Delete(index: integer);
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55 | procedure Remove(const obj: TObject); overload;
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56 | function GetMethod(Obj: TObject): TMethod;
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57 | // property Methods;
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58 | end;
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59 |
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60 | // event fires before the component has acted on the notification
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61 | TVANotifyEvent = procedure(AComponent: TComponent; Operation: TOperation) of object;
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62 |
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63 | TVANotificationEventComponent = class(TComponent)
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64 | private
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65 | FOnNotifyEvent: TVANotifyEvent;
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66 | protected
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67 | procedure Notification(AComponent: TComponent; Operation: TOperation); override;
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68 | public
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69 | constructor NotifyCreate(AOwner: TComponent; AOnNotifyEvent: TVANotifyEvent); virtual;
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70 | property OnNotifyEvent: TVANotifyEvent read FOnNotifyEvent write FOnNotifyEvent;
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71 | end;
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72 |
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73 | TVAListChangeEvent = procedure(Sender: TObject; Item: Pointer; Operation: TOperation) of object;
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74 |
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75 | TVAList = class(TList)
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76 | private
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77 | FOnChange: TVAListChangeEvent;
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78 | protected
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79 | procedure Notify(Ptr: Pointer; Action: TListNotification); override;
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80 | published
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81 | property OnChange: TVAListChangeEvent read FOnChange write FOnChange;
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82 | end;
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83 |
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84 | const
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85 | DynaPropAccesibilityCaption = 1;
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86 |
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87 | type
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88 | IVADynamicProperty = interface(IInterface)
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89 | ['{1D1620E9-59D1-475D-94E9-FAE89A601D55}']
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90 | function SupportsDynamicProperty(PropertyID: integer): boolean;
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91 | function GetDynamicProperty(PropertyID: integer): string;
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92 | end;
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93 |
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94 | implementation
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95 |
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96 | { TVABaseMethodList }
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97 |
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98 | procedure TVABaseMethodList.Add(const Method: TMethod);
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99 | begin
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100 | if IndexOf(Method) < 0 then
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101 | begin
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102 | FCode.Add(Method.Code);
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103 | FData.Add(Method.Data);
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104 | end;
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105 | end;
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106 |
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107 | procedure TVABaseMethodList.Clear;
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108 | begin
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109 | FCode.Clear;
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110 | FData.Clear;
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111 | end;
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112 |
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113 | function TVABaseMethodList.Count: integer;
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114 | begin
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115 | Result := FCode.Count;
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116 | end;
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117 |
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118 | constructor TVABaseMethodList.Create;
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119 | begin
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120 | FCode := TList.Create;
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121 | FData := TList.Create;
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122 | end;
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123 |
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124 | procedure TVABaseMethodList.Delete(index: integer);
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125 | begin
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126 | FCode.Delete(index);
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127 | FData.Delete(index);
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128 | end;
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129 |
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130 | destructor TVABaseMethodList.Destroy;
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131 | begin
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132 | FreeAndNil(FCode);
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133 | FreeAndNil(FData);
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134 | inherited;
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135 | end;
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136 |
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137 | function TVABaseMethodList.GetMethod(index: integer): TMethod;
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138 | begin
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139 | Result.Code := FCode[index];
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140 | Result.Data := FData[index];
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141 | end;
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142 |
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143 | function TVABaseMethodList.IndexOf(const Method: TMethod): integer;
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144 | begin
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145 | if assigned(Method.Code) and assigned(Method.data) and (FCode.Count > 0) then
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146 | begin
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147 | Result := 0;
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148 | while((Result < FCode.Count) and ((FCode[Result] <> Method.Code) or
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149 | (FData[Result] <> Method.Data))) do inc(Result);
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150 | if Result >= FCode.Count then Result := -1;
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151 | end
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152 | else
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153 | Result := -1;
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154 | end;
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155 |
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156 | procedure TVABaseMethodList.Remove(const Method: TMethod);
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157 | var
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158 | idx: integer;
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159 |
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160 | begin
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161 | idx := IndexOf(Method);
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162 | if(idx >= 0) then
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163 | begin
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164 | FCode.Delete(idx);
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165 | FData.Delete(idx);
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166 | end;
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167 | end;
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168 |
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169 | { TVAMethodList }
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170 |
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171 | procedure TVAMethodList.Add(const Method: TMethod);
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172 | begin
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173 | inherited Add(Method);
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174 | end;
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175 |
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176 | procedure TVAMethodList.Clear;
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177 | begin
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178 | inherited Clear;
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179 | end;
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180 |
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181 | function TVAMethodList.Count: integer;
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182 | begin
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183 | Result := inherited Count;
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184 | end;
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185 |
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186 | constructor TVAMethodList.Create;
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187 | begin
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188 | inherited Create;
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189 | end;
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190 |
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191 | procedure TVAMethodList.Delete(index: integer);
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192 | begin
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193 | inherited Delete(index);
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194 | end;
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195 |
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196 | destructor TVAMethodList.Destroy;
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197 | begin
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198 | inherited;
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199 | end;
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200 |
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201 | function TVAMethodList.IndexOf(const Method: TMethod): integer;
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202 | begin
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203 | Result := inherited IndexOf(Method);
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204 | end;
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205 |
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206 | procedure TVAMethodList.Remove(const Method: TMethod);
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207 | begin
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208 | inherited Remove(Method);
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209 | end;
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210 |
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211 | { TVANotificationEventComponent }
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212 |
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213 | procedure TVANotificationEventComponent.Notification(AComponent: TComponent;
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214 | Operation: TOperation);
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215 | begin
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216 | if assigned(FOnNotifyEvent) then FOnNotifyEvent(AComponent, Operation);
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217 | inherited;
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218 | end;
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219 |
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220 | constructor TVANotificationEventComponent.NotifyCreate(AOwner: TComponent;
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221 | AOnNotifyEvent: TVANotifyEvent);
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222 | begin
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223 | inherited Create(AOwner);
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224 | FOnNotifyEvent := AOnNotifyEvent;
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225 | end;
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226 |
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227 | { TVALinkedMethodList }
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228 |
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229 | procedure TVALinkedMethodList.Add(Obj: TObject; const Method: TMethod);
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230 | begin
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231 | if assigned(obj) and assigned(Method.Code) and (IndexOf(Obj) < 0) then
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232 | begin
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233 | FLinkedObjects.Add(Obj);
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234 | Code.Add(Method.Code);
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235 | Data.Add(Method.Data);
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236 | end;
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237 | end;
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238 |
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239 | procedure TVALinkedMethodList.Clear;
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240 | begin
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241 | FLinkedObjects.Clear;
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242 | Code.Clear;
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243 | Data.Clear;
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244 | end;
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245 |
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246 | function TVALinkedMethodList.Count: integer;
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247 | begin
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248 | Result := FLinkedObjects.Count;
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249 | end;
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250 |
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251 | constructor TVALinkedMethodList.Create;
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252 | begin
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253 | inherited;
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254 | FLinkedObjects := TList.Create;
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255 | end;
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256 |
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257 | procedure TVALinkedMethodList.Delete(index: integer);
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258 | begin
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259 | FLinkedObjects.Delete(index);
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260 | Code.Delete(index);
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261 | Data.Delete(index);
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262 | end;
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263 |
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264 | destructor TVALinkedMethodList.Destroy;
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265 | begin
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266 | FreeAndNil(FLinkedObjects);
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267 | inherited;
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268 | end;
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269 |
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270 | function TVALinkedMethodList.GetMethod(Obj: TObject): TMethod;
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271 | var
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272 | idx: integer;
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273 | begin
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274 | idx := IndexOf(Obj);
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275 | if idx < 0 then
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276 | begin
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277 | Result.Code := nil;
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278 | Result.Data := nil;
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279 | end
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280 | else
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281 | Result := Methods[idx];
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282 | end;
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283 |
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284 | function TVALinkedMethodList.IndexOf(const obj: TObject): integer;
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285 | begin
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286 | if assigned(obj) then
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287 | Result := FLinkedObjects.IndexOf(obj)
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288 | else
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289 | Result := -1;
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290 | end;
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291 |
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292 | procedure TVALinkedMethodList.Remove(const obj: TObject);
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293 | var
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294 | i: integer;
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295 | begin
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296 | i := IndexOf(obj);
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297 | if i >= 0 then
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298 | Delete(i);
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299 | end;
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300 |
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301 | { TVAList }
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302 |
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303 | procedure TVAList.Notify(Ptr: Pointer; Action: TListNotification);
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304 | begin
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305 | if assigned(FOnChange) and (Ptr <> nil) then
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306 | begin
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307 | if Action = lnAdded then
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308 | FOnChange(Self, Ptr, opInsert)
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309 | else
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310 | FOnChange(Self, Ptr, opRemove)
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311 | end;
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312 | end;
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313 |
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314 | end.
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