查询条件的封装（二）

  TConditionItem
 
 1 { TConditionItem }
 2
 3 procedure TConditionItem.Assign(Source: TPersistent);
 4 begin
 5   if Source is TConditionItem then
 6   begin
 7     if Assigned(Collection) then Collection.BeginUpdate;
 8     try
 9       //RestoreDefaults;
10       ConditionName := TConditionItem(Source).ConditionName;
11       ConditionLabel := TConditionItem(Source).ConditionLabel;
12       ConditionEditType := TConditionItem(Source).ConditionEditType;
13       ConditionValueType := TConditionItem(Source).ConditionValueType;
14     finally
15       if Assigned(Collection) then Collection.EndUpdate;
16     end;   
17   end
18   else
19     inherited Assign(Source);
20 end;
21
22 constructor TConditionItem.Create(Collection: TCollection);
23 begin
24   try
25     inherited Create(Collection);
26     FConditionName := Self.ClassName+IntToStr(Collection.Count);
27     FConditionLabel := '查询条件'+IntToStr(Collection.Count);
28     FConditionValueType := cidtString;
29     FConditionEditType := cetButtonEdit;
30     if Collection is TConditionItems then
31     begin
32       if TConditionItems(Collection).FConditionUI <> nil then
33         TConditionItems(Collection).FConditionUI.BuildConditionGridByItems;
34     end;
35   finally
36
37   end;
38 end;
39
40 procedure TConditionItem.SetConditionEditType(
41   const Value: TConditionEditType);
42 begin
43   FConditionEditType := Value;
44 end;
45
46 procedure TConditionItem.SetConditionLabel(const Value: string);
47 begin
48   FConditionLabel := Value;
49 end;
50
51 procedure TConditionItem.SetConditionName(const Value: string);
52 begin
53   FConditionName := Value;
54 end;
55
56 procedure TConditionItem.SetConditionValue(const Value: Variant);
57 begin
58   FConditionValue := Value;
59 end;
60
61 procedure TConditionItem.SetConditionValueType(
62   const Value: TConditionItemDataType);
63 begin
64   FConditionValueType := Value;
65 end;
66
67 procedure TConditionItem.SetIndex(Value: Integer);
68 begin
69   inherited SetIndex(Value);
70 // 这里不需要处理，SetIndex会触发Changed，从而触发容器的Update。Update已经有控制表格的处理逻辑。
71 //  if Collection is TConditionItems then
72 //  begin
73 //    if TConditionItems(Collection).FConditionUI <> nil then
74 //      TConditionItems(Collection).FConditionUI.BuildConditionGridByItems;
75 //  end;
76 end;
 
  TConditionItems
 
 1 { TConditionItems }
 2
 3 function TConditionItems.Add: TConditionItem;
 4 begin
 5   Result := TConditionItem(inherited Add);
 6 end;
 7
 8 constructor TConditionItems.Create(AConditionUI: TConditionUI;
 9   ItemClass: TItemClass);
10 begin
11   inherited Create(ItemClass);
12   FConditionUI := AConditionUI;
13 end;
14
15 function TConditionItems.FindItemIndex(index: Integer): TConditionItem;
16 var
17   i : Integer;
18 begin
19   Result := nil;
20   for i := 0 to Count - 1 do
21   begin
22     if Items[i].Index = index then
23     begin
24       Result := Items[i];
25       Break;
26     end;
27   end;
28 end;
29
30 function TConditionItems.FindItemName(
31   AConditionName: string): TConditionItem;
32 var
33   i : Integer;
34 begin
35   Result := nil;
36   for i := 0 to Count - 1 do
37   begin
38     if Items[i].ConditionName = AConditionName then
39     begin
40       Result := Items[i];
41       Break;
42     end;
43   end;
44 end;
45
46 function TConditionItems.GetItems(Index: Integer): TConditionItem;
47 begin
48   Result := TConditionItem(inherited Items[Index]);
49 end;
50
51 function TConditionItems.GetOwner: TPersistent;
52 begin
53   Result := FConditionUI;
54 end;
55
56 procedure TConditionItems.SetItems(Index: Integer;
57   const Value: TConditionItem);
58 begin
59   Items[Index].Assign(Value);
60 end;
61
62 procedure TConditionItems.Update(Item: TCollectionItem);
63 begin
64   if (FConditionUI.ConditionGrid = nil) or (csLoading in FConditionUI.ConditionGrid.ComponentState) then Exit;
65   if Item = nil then
66   begin
67
68   end
69   else
70   begin
71
72   end;
73   FConditionUI.BuildConditionGridByItems;
74 end;
 
  TConditionUI
 
  1 { TConditionUI }
  2
  3 procedure TConditionUI.BuildConditionGridByItems;
  4 const AColumnCaption: array[0..2] of string = ('查询条件', '条件值', '隐藏列');
  5 var
  6   i : integer;
  7   Column : TcxGridColumn;
  8 begin
  9   if FConditionGrid <> nil then
 10   begin
 11     with FConditionGrid do
 12     begin
 13       BeginUpdate;
 14       // 清空表格记录
 15       OptionsSelection.CellMultiSelect := true;
 16       DataController.ClearSelection;
 17       DataController.SelectAll;
 18       DataController.DeleteSelection;
 19       OptionsSelection.CellMultiSelect := False;
 20
 21       // 清空表格列
 22       for i := FConditionGrid.ColumnCount - 1 downto 0 do
 23       begin
 24         FConditionGrid.Columns[i].Free;
 25       end;
 26      
 27       //

补充：软件开发 , Delphi ,

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