summaryrefslogtreecommitdiff
path: root/fpcsrc/rtl/objpas/classes/collect.inc
blob: e8d2a1089d06749babad48457f5498e1ae6e1128 (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
{
    This file is part of the Free Component Library (FCL)
    Copyright (c) 1999-2000 by the Free Pascal development team

    See the file COPYING.FPC, included in this distribution,
    for details about the copyright.

    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.

 **********************************************************************}
{****************************************************************************}
{*                             TCollectionItem                              *}
{****************************************************************************}


function TCollectionItem.GetIndex: Integer;

begin
  if FCollection<>nil then
    Result:=FCollection.FItems.IndexOf(Pointer(Self))
  else
    Result:=-1;
end;



procedure TCollectionItem.SetCollection(Value: TCollection);

begin
  IF Value<>FCollection then
    begin
    If FCollection<>Nil then FCollection.RemoveItem(Self);
    if Value<>Nil then Value.InsertItem(Self);
    FCollection:=Value;
    end;
end;



procedure TCollectionItem.Changed(AllItems: Boolean);

begin
 If (FCollection<>Nil) and (FCollection.UpdateCount=0) then
  begin
  If AllItems then
    FCollection.Update(Nil)
  else
    FCollection.Update(Self);
  end;
end;



function TCollectionItem.GetNamePath: string;

begin
  If FCollection<>Nil then
    Result:=FCollection.GetNamePath+'['+IntToStr(Index)+']'
  else
    Result:=ClassName;
end;


function TCollectionItem.GetOwner: TPersistent;

begin
  Result:=FCollection;
end;



function TCollectionItem.GetDisplayName: string;

begin
  Result:=ClassName;
end;



procedure TCollectionItem.SetIndex(Value: Integer);

Var Temp : Longint;

begin
  Temp:=GetIndex;
  If (Temp>-1) and (Temp<>Value) then
    begin
    FCollection.FItems.Move(Temp,Value);
    Changed(True);
    end;
end;


procedure TCollectionItem.SetDisplayName(const Value: string);

begin
  Changed(False);
end;



constructor TCollectionItem.Create(ACollection: TCollection);

begin
  Inherited Create;
  SetCollection(ACollection);
end;



destructor TCollectionItem.Destroy;

begin
  SetCollection(Nil);
  Inherited Destroy;
end;

{****************************************************************************}
{*                          TCollectionEnumerator                           *}
{****************************************************************************}

constructor TCollectionEnumerator.Create(ACollection: TCollection);
begin
  inherited Create;
  FCollection := ACollection;
  FPosition := -1;
end;

function TCollectionEnumerator.GetCurrent: TCollectionItem;
begin
  Result := FCollection.Items[FPosition];
end;

function TCollectionEnumerator.MoveNext: Boolean;
begin
  Inc(FPosition);
  Result := FPosition < FCollection.Count;
end;


{****************************************************************************}
{*                             TCollection                                  *}
{****************************************************************************}

function TCollection.Owner: TPersistent;
begin
  result:=getowner;
end;


function TCollection.GetCount: Integer;

begin
  Result:=FItems.Count;
end;


Procedure TCollection.SetPropName;

Var
  TheOwner : TPersistent;
  PropList : PPropList;
  I, PropCount : Integer;

begin
  FPropName:='';
  TheOwner:=GetOwner;
  if (TheOwner=Nil) Or (TheOwner.Classinfo=Nil) Then Exit;
  // get information from the owner RTTI
  PropCount:=GetPropList(TheOwner, PropList);
  Try
    For I:=0 To PropCount-1 Do
      If (PropList^[i]^.PropType^.Kind=tkClass) And
         (GetObjectProp(TheOwner, PropList^[i], ClassType)=Self) Then
        Begin
          FPropName:=PropList^[i]^.Name;
          Exit;
        End;
  Finally
    FreeMem(PropList);
  End;
end;


function TCollection.GetPropName: string;

Var
  TheOwner : TPersistent;

begin
  Result:=FPropNAme;
  TheOwner:=GetOwner;
  If (Result<>'') or (TheOwner=Nil) Or (TheOwner.Classinfo=Nil) then exit;
  SetPropName;
  Result:=FPropName;
end;


procedure TCollection.InsertItem(Item: TCollectionItem);
begin
  If Not(Item Is FitemClass) then
    exit;
  FItems.add(Pointer(Item));
  Item.FID:=FNextID;
  inc(FNextID);
  SetItemName(Item);
  Notify(Item,cnAdded);
  Changed;
end;


procedure TCollection.RemoveItem(Item: TCollectionItem);

Var
  I : Integer;

begin
  Notify(Item,cnExtracting);
  I:=FItems.IndexOfItem(Item,fromEnd);
  If (I<>-1) then
    FItems.Delete(I);
  Item.FCollection:=Nil;
  Changed;
end;


function TCollection.GetAttrCount: Integer;
begin
  Result:=0;
end;


function TCollection.GetAttr(Index: Integer): string;
begin
  Result:='';
end;


function TCollection.GetItemAttr(Index, ItemIndex: Integer): string;
begin
  Result:=TCollectionItem(FItems.Items[ItemIndex]).DisplayName;
end;


function TCollection.GetEnumerator: TCollectionEnumerator;
begin
  Result := TCollectionEnumerator.Create(Self);
end;


function TCollection.GetNamePath: string;
var o : TPersistent;
begin
  o:=getowner;
  if assigned(o) and (propname<>'') then 
     result:=o.getnamepath+'.'+propname
   else
     result:=classname;
end;


procedure TCollection.Changed;
begin
  if FUpdateCount=0 then
    Update(Nil);
end;


function TCollection.GetItem(Index: Integer): TCollectionItem;
begin
  Result:=TCollectionItem(FItems.Items[Index]);
end;


procedure TCollection.SetItem(Index: Integer; Value: TCollectionItem);
begin
  TCollectionItem(FItems.items[Index]).Assign(Value);
end;


procedure TCollection.SetItemName(Item: TCollectionItem);
begin
end;



procedure TCollection.Update(Item: TCollectionItem);
begin
  FPONotifyObservers(Self,ooChange,Pointer(Item));
end;


constructor TCollection.Create(AItemClass: TCollectionItemClass);
begin
  inherited create;
  FItemClass:=AItemClass;
  FItems:=TFpList.Create;
end;


destructor TCollection.Destroy;
begin
  BeginUpdate; // Prevent OnChange
  DoClear;
  FItems.Free;
  Inherited Destroy;
end;


function TCollection.Add: TCollectionItem;
begin
  Result:=FItemClass.Create(Self);
end;


procedure TCollection.Assign(Source: TPersistent);
Var I : Longint;
begin
  If Source is TCollection then
    begin
    Clear;
    For I:=0 To TCollection(Source).Count-1 do
     Add.Assign(TCollection(Source).Items[I]);
    exit;
    end
  else
    Inherited Assign(Source);
end;


procedure TCollection.BeginUpdate;
begin
  inc(FUpdateCount);
end;


procedure TCollection.Clear;
begin
  if FItems.Count=0 then
    exit; // Prevent Changed
  BeginUpdate;
  try
    DoClear;
  finally
    EndUpdate;
  end;    
end;


procedure TCollection.DoClear;
begin
  While FItems.Count>0 do TCollectionItem(FItems.Last).Free;
end;


procedure TCollection.EndUpdate;
begin
  dec(FUpdateCount);
  if FUpdateCount=0 then
    Changed;
end;


function TCollection.FindItemID(ID: Integer): TCollectionItem;
Var
          I : Longint;
begin
  For I:=0 to Fitems.Count-1 do
   begin
     Result:=TCollectionItem(FItems.items[I]);
     If Result.Id=Id then
       exit;
   end;
  Result:=Nil;
end;


procedure TCollection.Delete(Index: Integer);
Var
  Item : TCollectionItem;
begin
  Item:=TCollectionItem(FItems[Index]);
  Notify(Item,cnDeleting);
  Item.Free;
end;


function TCollection.Insert(Index: Integer): TCollectionItem;
begin
  Result:=Add;
  Result.Index:=Index;
end;


procedure TCollection.Notify(Item: TCollectionItem;Action: TCollectionNotification);
begin
  if Assigned(FObservers) then
    Case Action of
      cnAdded      : FPONotifyObservers(Self,ooAddItem,Pointer(Item));
      cnExtracting : FPONotifyObservers(Self,ooDeleteItem,Pointer(Item));
      cnDeleting   : FPONotifyObservers(Self,ooDeleteItem,Pointer(Item));
    end;
end;

procedure TCollection.Sort(Const Compare : TCollectionSortCompare);

begin
  BeginUpdate;
  try
    FItems.Sort(TListSortCompare(Compare));
  Finally
    EndUpdate;
  end;
end;

procedure TCollection.Exchange(Const Index1, index2: integer);

begin
  FItems.Exchange(Index1,Index2);
  FPONotifyObservers(Self,ooChange,Nil);
end;


{****************************************************************************}
{*                             TOwnedCollection                             *}
{****************************************************************************}



Constructor TOwnedCollection.Create(AOwner: TPersistent; AItemClass: TCollectionItemClass);

Begin
  FOwner := AOwner;
  inherited Create(AItemClass);
end;



Function TOwnedCollection.GetOwner: TPersistent;

begin
  Result:=FOwner;
end;