Delphi Livebinding对象和组合框或单选按钮
我为业务逻辑定义了后续单元Delphi Livebinding对象和组合框或单选按钮,delphi,livebindings,tcombobox,tobject,Delphi,Livebindings,Tcombobox,Tobject,我为业务逻辑定义了后续单元 unit Models.Person; interface Type TPersonGender = (pgUndefined, pgMale, pgFemale, pgNotApplicable); TSexOfPerson = class(TPersistent) private FGender : TPersonGender; protected function GetDescription : string; f
unit Models.Person;
interface
Type
TPersonGender = (pgUndefined, pgMale, pgFemale, pgNotApplicable);
TSexOfPerson = class(TPersistent)
private
FGender : TPersonGender;
protected
function GetDescription : string;
function GetCode : string;
function GetIndex : integer;
public
constructor Create; overload;
constructor Create(const aValue : TGenderPerson); overload;
procedure Assign(Source: TPersistent); override;
property Gender : TGenderPerson read FGender write FGender;
property Description : string read GetDescription;
property Code : string read GetCode;
property Index : integer read GetIndex;
end;
TPerson = class(TPersistent)
private
FSex : TSexOfPerson;
FName : string;
FSurName : string;
FAddress : string;
protected
function GetSex : TPersonGender;
procedure SetSex(aGender : TPersonGender);
public
constructor Create; overload;
constructor Create(const aValue : TPerson); overload;
destructor Destroy; override;
procedure Assign(Source: TPersistent); override;
property Name : string read FName write FName;
property SurName : string read FSurName write FSurName;
property Address : string read FAddress write FAddress;
property Sex : TPersonGender read GetSex write SetSex
end;
implementation
{ TSexOfPerson }
constructor TSexOfPerson.Create;
begin
inherited Create;
FGender := pgUndefined;
end;
constructor TSexOfPerson.Create(const aValue : TPersonGender);
begin
inherited Create;
FGender := aValue
end;
procedure TSexOfPerson.Assign(Source: TPersistent);
begin
if Source is TSexOfPerson then
FGender := TSexOfPerson(Source).Gender
else
inherited Assign(Source)
end;
function TSexOfPerson.GetDescription;
begin
case FGender of
pgUndefined : Result := '<Undefined>';
pgMale : Result := 'Male';
pgFemale : Result := 'Female';
pgNotApplicable : Result := '<Not applicable>';
end
end;
function TSexOfPerson.GetIndex;
begin
Result := Ord(FGender)
end;
function TSexOfPerson.GetCodice;
begin
case FGender of
pgUndefined : Result := '';
pgMale : Result := 'M';
pgFemale : Result := 'F';
pgNotApplicable : Result := 'N'
end
end;
{ TPerson }
constructor TPerson.Create;
begin
inherited Create;
FSex := TSexOfPerson.Create(pgUndefined)
end;
constructor TPerson.Create(const aValue : TPerson);
begin
inherited Create;
FSex := TSexOfPerson.Create(aValue)
end;
destructor TPerson.Destroy;
begin
FSex.Free;
inherited Destroy
end;
procedure TPerson.Assign(Source: TPersistent);
begin
if Source is TPerson then
begin
FName := TPerson(Source).Name;
FSurName := TPerson(Source).SurName;
FAddress := TPerson(Source).Address;
FSex.Gender := TPerson(Source).Sex;
end
else
inherited Assign(Source)
end;
function GetSex : TPersonGender;
begin
Result := FSex.Gender
end;
procedure SetSex(aGender : TPersonGender);
begin
if FSex.Gender <> aGender then
FSex.Gender := aGender
end;
end.
unitmodels.Person;
接口
类型
TPersonGender=(pgUndefined,pgMale,pgFemale,pgnotapplicate);
TSexOfPerson=class(TPersistent)
私有的
FGender:TPersonGender;
受保护的
函数GetDescription:字符串;
函数GetCode:string;
函数GetIndex:integer;
公众的
构造函数创建;超载;
构造函数创建(const aValue:TGenderPerson);超载;
程序分配(来源:TPersistent);推翻
属性性别:TGenderPerson read FGender write FGender;
属性描述:字符串读取GetDescription;
属性代码:字符串读取GetCode;
属性索引:整数读取GetIndex;
结束;
TPerson=类(TPersistent)
私有的
FSex:TSexOfPerson;
FName:字符串;
FSurName:字符串;
时尚服饰:细绳;
受保护的
函数GetSex:TPersonGender;
程序SetSex(代理商:TPersonGender);
公众的
构造函数创建;超载;
构造函数创建(const aValue:TPerson);超载;
毁灭者毁灭;推翻
程序分配(来源:TPersistent);推翻
属性名称:字符串读取FName写入FName;
属性姓氏:字符串读取FSurName写入FSurName;
属性地址:字符串读取FAddress写入FAddress;
属性性别:TPersonGender read GetSex write SetSex
结束;
实施
{TSexOfPerson}
构造函数TSexOfPerson.Create;
开始
继承创造;
FGender:=pgUndefined;
结束;
构造函数TSexOfPerson.Create(const aValue:TPersonGender);
开始
继承创造;
FGender:=aValue
结束;
程序TSexOfPerson.Assign(来源:TPersistent);
开始
如果来源是TSexOfPerson,那么
FGender:=TSexOfPerson(来源)。性别
其他的
继承分配(源)
结束;
函数TSexOfPerson.GetDescription;
开始
案例F
pgUndefined:结果:='';
pgMale:结果:='男';
pgFemale:结果:='Female';
pgNotApplicable:结果:='';
结束
结束;
函数TSexOfPerson.GetIndex;
开始
结果:=Ord(FGender)
结束;
函数TSexOfPerson.GetCodice;
开始
案例F
pgUndefined:结果:='';
pgMale:结果:='M';
pgFemale:结果:='F';
pgNotApplicable:结果:='N'
结束
结束;
{TPerson}
构造函数TPerson.Create;
开始
继承创造;
FSex:=TSexOfPerson.Create(pgUndefined)
结束;
构造函数TPerson.Create(const aValue:TPerson);
开始
继承创造;
FSex:=TSexOfPerson.Create(aValue)
结束;
毁灭者,毁灭者;
开始
免费;
继承性破坏
结束;
程序TPerson.Assign(来源:TPersistent);
开始
如果来源是TPerson,那么
开始
FName:=TPerson(Source).Name;
FSurName:=TPerson(来源)。姓氏;
FAddress:=TPerson(源)。地址;
性别:=TPerson(来源)。性别;
结束
其他的
继承分配(源)
结束;
函数GetSex:TPersonGender;
开始
结果:=FSex.性别
结束;
程序SetSex(代理商:TPersonGender);
开始
如果是FSex.性别代理,则
性别:=aGender
结束;
结束。
现在,我将设计一个用于编辑TPerson的表单,用三个TEdit和一个TCombobox来选择性别
如何为Tcombox使用双向livebinding?鉴于使用Delphi在复杂类和控件之间进行livebinding并不容易,为了简化,我认为应该如下更改TPerson类:
TPerson = class(TPersistent)
private
FSex : TSexOfPerson;
FName : string;
FSurName : string;
FAddress : string;
protected
function GetSex : TPersonGender;
procedure SetSex(aGender : TPersonGender);
public
constructor Create; overload;
constructor Create(const aValue : TPerson); overload;
destructor Destroy; override;
procedure Assign(Source: TPersistent); override;
property Name : string read FName write FName;
property SurName : string read FSurName write FSurName;
property Address : string read FAddress write FAddress;
property Sex : integer read GetSex write SetSex
end;
implementation
...
function TPerson.GetSex : integer;
begin
Result := FSex.Index
end;
procedure TPerson.SetSex (aValue : integer);
begin
if FSex.Integer <> aValue then
case aValue of
0 : FSex.MtsSesso := pgUndefined;
1 : FSex.MtsSesso := pgMale;
2 : FSex.MtsSesso := pgFemale;
3 : FSex.MtsSesso := pgNotApplicable;
end;
end;
procedure TPerson.Assign(Source: TPersistent);
begin
if Source is TPerson then
begin
FName := TPerson(Source).Name;
FSurName := TPerson(Source).SurName;
FAddress := TPerson(Source).Address;
case TPerson(Source).Sex of
0 : FSex.MtsSesso := pgUndefined;
1 : FSex.MtsSesso := pgMale;
2 : FSex.MtsSesso := pgFemale;
3 : FSex.MtsSesso := pgNotApplicable;
end;
end
else
inherited Assign(Source)
end;
...
就这些
我希望该解决方案足够强大,并且更容易重申。如果您使用TComboBox而不是TRadioButtons,我们将以这种方式继续。 我更喜欢为TSexOfPerson类创建适配器:
type
TSexOfPersonsAdapter = class(TListBindSourceAdapter<TSexOfPerson>)
public
constructor Create(AOwner: TComponent); override;
end;
procedure Register;
...
constructor TSexOfPersonsAdapter.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
//load Sex Persons list
SetList(LoadSexOfPerson)
end;
procedure Register;
begin
RegisterComponents('CustomAdapters', [TSexOfPersonsAdapter]);
end;
function LoadSexOfperson: TList<TSexOfPerson>;
begin
Result := TObjectList<TSexOfPerson>.Create;
Result.Add(TSexOfPerson.Create(pgUndefined));
Result.Add(TSexOfPerson.Create(pgMale));
Result.Add(TSexOfPerson.Create(pgFemale));
Result.Add(TSexOfPerson.Create(pgNotApplicable));
end;
在ComboBox1上,按如下方式设置OnChange
procedure TForm1.ComboBox1Change(Sender: TObject);
var
aValue : TValue;
begin
aValue := LinkFillControlToField1.BindList.GetSelectedValue;
case aValue.AsInteger of
Ord(pgUndefined) : CurrentPerson.Sex := Ord(pgUndefined);
Ord(pgMale) : CurrentPerson.Sex := Ord(pgMale);
Ord(pgFemale) : CurrentPerson.Sex := Ord(pgFemale);
Ord(pgNotApplicable) : CurrentPerson.Sex := Ord(pgNotApplicable);
end
end;
就这些
procedure TForm1.RadioButton1Click(Sender: TObject);
begin
if not TRadioButton(Sender).IsChecked then
CurrentPerson.Sex := Ord(pgUndefined)
end;
procedure TForm1.RadioButton2Click(Sender: TObject);
begin
if not TRadioButton(Sender).IsChecked then
CurrentPerson.Sex := Ord(pgMale)
end;
procedure TForm1.RadioButton3Click(Sender: TObject);
begin
if not TRadioButton(Sender).IsChecked then
CurrentPerson.Sex := Ord(pgFemale)
end;
procedure TForm1.RadioButton4Click(Sender: TObject);
begin
if not TRadioButton(Sender).IsChecked then
CurrentPerson.Sex := Ord(pgNotApplicable)
end;
type
TSexOfPersonsAdapter = class(TListBindSourceAdapter<TSexOfPerson>)
public
constructor Create(AOwner: TComponent); override;
end;
procedure Register;
...
constructor TSexOfPersonsAdapter.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
//load Sex Persons list
SetList(LoadSexOfPerson)
end;
procedure Register;
begin
RegisterComponents('CustomAdapters', [TSexOfPersonsAdapter]);
end;
function LoadSexOfperson: TList<TSexOfPerson>;
begin
Result := TObjectList<TSexOfPerson>.Create;
Result.Add(TSexOfPerson.Create(pgUndefined));
Result.Add(TSexOfPerson.Create(pgMale));
Result.Add(TSexOfPerson.Create(pgFemale));
Result.Add(TSexOfPerson.Create(pgNotApplicable));
end;
SexOfPersonABS.Adapter = SexOfPersonsAdapter1;
PersonABS.Adapter = PersonsAdapter1;
PersonABS.OnCreateAdapter = PersonABSCreateAdapter;
procedure TForm1.PersonABSCreateAdapter(Sender: TObject; var ABindSourceAdapter: TBindSourceAdapter);
begin
ABindSourceAdapter := TObjectBindSourceAdapter<TPerson>.Create(PersonABS, CurrentPerson, False);
ABindSourceAdapter.AutoPost := True;
end;
LinkFillControlToField1.Control = ComboBox1;
LinkFillControlToField1.DataSource = PersonABS;
LinkFillControlToField1.FieldName = 'Sex';
LinkFillControlToField1.FillDataSource = SexOfPersonABS;
LinkFillControlToField1.FillDisplayFieldName = 'Description';
LinkFillControlToField1.FillValueFieldName = 'Index';
procedure TForm1.ComboBox1Change(Sender: TObject);
var
aValue : TValue;
begin
aValue := LinkFillControlToField1.BindList.GetSelectedValue;
case aValue.AsInteger of
Ord(pgUndefined) : CurrentPerson.Sex := Ord(pgUndefined);
Ord(pgMale) : CurrentPerson.Sex := Ord(pgMale);
Ord(pgFemale) : CurrentPerson.Sex := Ord(pgFemale);
Ord(pgNotApplicable) : CurrentPerson.Sex := Ord(pgNotApplicable);
end
end;