Changing DisplayNames of my properties using PropertyGrid component, how ??

4 Dec 2006 3:04 PM

Tugrul HELVACI

I'm using Delphi 2006 and I have a class defination like this:

TPerson = class
fPersonName : String;
fPersonSurName : String;
fPersonAge : Integer;
published
property PersonName : String read fPersonName write fPersonName;
property PersonSurname : String read fPersonSurname write fPersonSurname;
property PersonAge : Integer read fPersonAge write fPersonAge;
end;

and i want to display my class instance using PropertyGrid,so...

var
mPerson : TPerson;
begin
mPerson := TPerson.Create;
mPerson.PersonName := 'Tugrul';
mPerson.PersonSurname := 'HELVACI';
mPerson.PersonAge := 31;
PropertyGrid1.SelectedObject := mPerson;
end;

at the above code i can see my class instance in the property grid.
But i want to change property display names in the propertygrid component.
Because of these, i was searching on the net and i found PropertyDescriptor
abstract class
and ICustomTypeConverter interface.

i implemented theese classes following:

TArrayOfAttribute = array of Attribute;
TMyDescriptor = class(PropertyDescriptor)
private
    base : PropertyDescriptor;
    fName: String;

    function GetName : String;
    function GetDisplayName : String;
    function GetIsReadOnly : Boolean;
    function GetComponentType : &Type;
    function GetPropertyType : &Type;

    function GetCustomNames(baseName : String) : String; // my custom names
getter function
public
    constructor Create(baseP : PropertyDescriptor; filter :
TArrayOfAttribute); overload; virtual;
    constructor Create(baseP : PropertyDescriptor); overload; virtual;

    function CanResetValue(comp : TObject) : Boolean;
    function GetValue(comp : TObject) : TObject;

    procedure ResetValue(comp : TObject);
    procedure SetValue(comp : TObject; Value : TObject);
    function ShouldSerializeValue(comp : TObject) : Boolean;

    property Name : String read GetName;
    property DisplayName : String read GetDisplayName;
    property IsReadOnly : Boolean read GetIsReadOnly;
    property ComponentType : &Type read GetComponentType;
    property PropertyType : &Type read GetPropertyType;
end;

TMyClass = class(TInterfacedObject, ICustomTypeDescriptor)
public
    function GetProperties(filter : TArrayOfAttribute) :
PropertyDescriptorCollection; overload;
    function GetAttributes : AttributeCollection;
    function GetClassName : String;
    function GetComponentName : String;
    function GetConverter : TypeConverter;
    function GetDefaultEvent : EventDescriptor;

    function GetEvents(attributes : TArrayOfAttribute) :
EventDescriptorCollection; overload;
    function GetEvents : EventDescriptorCollection; overload;
    function GetDefaultProperty : PropertyDescriptor;

    function GetProperties : PropertyDescriptorCollection; overload;
    function GetEditor(editorBaseType : System.Type) : TObject;
    function GetPropertyOwner(pd : PropertyDescriptor) : TObject;
end;

and my new TPerson class is:
TPerson = class(TMyClass)
   fPersonName : String;
   fPersonSurName : String;
   fPersonAge : Integer;
published
   property PersonName : String read fPersonName write fPersonName;
   property PersonSurname : String read fPersonSurname write fPersonSurname;
   property PersonAge : Integer read fPersonAge write fPersonAge;
end;

**************** IMPLEMENTATIONS BELOW *********************************
{ TMyDescriptor }

function TMyDescriptor.CanResetValue(comp: TObject): Boolean;
begin
   Result := base.CanResetValue(comp);
end;

constructor TMyDescriptor.Create(baseP: PropertyDescriptor;
filter: TArrayOfAttribute);
begin
inherited Create(baseP, filter);
Self.base := baseP;
end;

constructor TMyDescriptor.Create(baseP: PropertyDescriptor);
begin
inherited Create(baseP);
Self.base := baseP;
end;

function TMyDescriptor.GetComponentType: &Type;
begin
Result := base.ComponentType;
end;

function TMyDescriptor.GetDisplayName: String;
begin
Result := GetCustomNames(base.Name);
end;

function TMyDescriptor.Getir(baseName : String): String;
begin
if baseName = 'PersonName' then Result := 'Names of the Personel';
if baseName = 'PersonSurname' then Result := 'Surname of the personel';
if baseName = 'PersonAge' then Result := 'Age of the personel';
end;

function TMyDescriptor.GetIsReadOnly: Boolean;
begin
Result := base.IsReadOnly;
end;

function TMyDescriptor.GetName: String;
begin
Result := base.Name;
end;

function TMyDescriptor.GetPropertyType: &Type;
begin
Result := base.PropertyType;
end;

function TMyDescriptor.GetValue(comp: TObject): TObject;
begin
Result := base.GetValue(comp);
end;

procedure TMyDescriptor.ResetValue(comp: TObject);
begin
base.ResetValue(comp);
end;

procedure TMyDescriptor.SetValue(comp, Value: TObject);
begin
base.SetValue(comp, value);
end;

function TMyDescriptor.ShouldSerializeValue(comp: TObject): Boolean;
begin
Result := base.ShouldSerializeValue(comp);
end;

{ TMyClass }

function TMyClass.GetProperties(
filter: TArrayOfAttribute): PropertyDescriptorCollection;
var
baseProps : PropertyDescriptorCollection;
newProps : array of PropertyDescriptor;
iCounter : Integer;
oldname,
newname   : String;
begin
baseProps := TypeDescriptor.GetProperties(GetType(), filter);

SetLength(newProps, baseProps.Count);

for iCounter := 0 to baseProps.Count do
begin
    newProps[iCounter] := TMyDescriptor.Create(baseProps[iCounter], filter);
// An error occured : E2402 constructing instance of abstract class..
    oldname := PropertyDescriptor(baseProps[iCounter]).DisplayName;
    newName := TMyDescriptor(newProps[iCounter]).DisplayName;
end;

Result := PropertyDescriptorCollection.Create(newProps);
end;

function TMyClass.GetAttributes: AttributeCollection;
begin
Result := TypeDescriptor.GetAttributes(Self, true);
end;

function TMyClass.GetClassName: String;
begin
Result := TypeDescriptor.GetClassName(Self, true);
end;

function TMyClass.GetComponentName: String;
begin
Result := TypeDescriptor.GetComponentName(Self, true);
end;

function TMyClass.GetConverter: TypeConverter;
begin
Result := TypeDescriptor.GetConverter(Self, true);
end;

function TMyClass.GetDefaultEvent: EventDescriptor;
begin
Result := TypeDescriptor.GetDefaultEvent(Self, true);
end;

function TMyClass.GetDefaultProperty: PropertyDescriptor;
begin
Result := TypeDescriptor.GetDefaultProperty(Self, true);
end;

function TMyClass.GetEditor(editorBaseType: System.Type): TObject;
begin
Result := TypeDescriptor.GetEditor(Self, editorBaseType, true);
end;

function TMyClass.GetEvents: EventDescriptorCollection;
begin
Result := TypeDescriptor.GetEvents(Self, true);
end;

function TMyClass.GetEvents(
attributes: TArrayOfAttribute): EventDescriptorCollection;
begin
Result := TypeDescriptor.GetEvents(Self, attributes, true);
end;

function TMyClass.GetProperties: PropertyDescriptorCollection;
begin
Result := TypeDescriptor.GetProperties(Self, true);
end;

function TMyClass.GetPropertyOwner(pd: PropertyDescriptor): TObject;
begin
Result := Self;
end;

I dont understand what is this. Can anybody helps me , how can i
subclassing PropertyDescriptor class correctly ??

Even we take an error when using delphi.net , we dont take any error
message using c#,

i want change the display name of the property which is the added to my
special class by using the propertyGrid Component ...
It's seems like DisplayNameAttirubute of the .net Framework 2.0

With My Best Regards,

Thanks For Helping

4 Dec 2006 6:03 PM

RobinS

I saw this posting in the following groups:

microsoft.public.dotnet.faqs
microsoft.public.dotnet.framework
microsoft.public.dotnet.framework.interop
microsoft.public.dotnet.framework.windowsforms
microsoft.public.dotnet.framework.windowsforms.controls
microsoft.public.dotnet.languages.csharp
microsoft.public.dotnet.general

When you post a message to multiple groups, please post all of
them at once. That way, if someone in one group provides a
solution, the solution will be posted to all of the groups.
Also, if someone in another group is working on a solution,
they will know it has been solved, and they can work on helping
somebody else.

Thanks,
Robin S.
---------------------------------
Show quote

"Tugrul HELVACI" <king_of_del***@hotmail.com> wrote in message
news:%23deORV7FHHA.2464@TK2MSFTNGP06.phx.gbl...
> I'm using Delphi 2006 and I have a class defination like this:
>
> TPerson = class
> fPersonName : String;
> fPersonSurName : String;
> fPersonAge : Integer;
> published
> property PersonName : String read fPersonName write fPersonName;
> property PersonSurname : String read fPersonSurname write fPersonSurname;
> property PersonAge : Integer read fPersonAge write fPersonAge;
> end;
>
> and i want to display my class instance using PropertyGrid,so...
>
> var
> mPerson : TPerson;
> begin
> mPerson := TPerson.Create;
> mPerson.PersonName := 'Tugrul';
> mPerson.PersonSurname := 'HELVACI';
> mPerson.PersonAge := 31;
> PropertyGrid1.SelectedObject := mPerson;
> end;
>
> at the above code i can see my class instance in the property grid.
> But i want to change property display names in the propertygrid component.
> Because of these, i was searching on the net and i found
> PropertyDescriptor abstract class
> and ICustomTypeConverter interface.
>
> i implemented theese classes following:
>
> TArrayOfAttribute = array of Attribute;
> TMyDescriptor = class(PropertyDescriptor)
> private
>    base : PropertyDescriptor;
>    fName: String;
>
>    function GetName : String;
>    function GetDisplayName : String;
>    function GetIsReadOnly : Boolean;
>    function GetComponentType : &Type;
>    function GetPropertyType : &Type;
>
>    function GetCustomNames(baseName : String) : String; // my custom names
> getter function
> public
>    constructor Create(baseP : PropertyDescriptor; filter :
> TArrayOfAttribute); overload; virtual;
>    constructor Create(baseP : PropertyDescriptor); overload; virtual;
>
>    function CanResetValue(comp : TObject) : Boolean;
>    function GetValue(comp : TObject) : TObject;
>
>    procedure ResetValue(comp : TObject);
>    procedure SetValue(comp : TObject; Value : TObject);
>    function ShouldSerializeValue(comp : TObject) : Boolean;
>
>
>    property Name : String read GetName;
>    property DisplayName : String read GetDisplayName;
>    property IsReadOnly : Boolean read GetIsReadOnly;
>    property ComponentType : &Type read GetComponentType;
>    property PropertyType : &Type read GetPropertyType;
> end;
>
> TMyClass = class(TInterfacedObject, ICustomTypeDescriptor)
> public
>    function GetProperties(filter : TArrayOfAttribute) :
> PropertyDescriptorCollection; overload;
>    function GetAttributes : AttributeCollection;
>    function GetClassName : String;
>    function GetComponentName : String;
>    function GetConverter : TypeConverter;
>    function GetDefaultEvent : EventDescriptor;
>
>    function GetEvents(attributes : TArrayOfAttribute) :
> EventDescriptorCollection; overload;
>    function GetEvents : EventDescriptorCollection; overload;
>    function GetDefaultProperty : PropertyDescriptor;
>
>    function GetProperties : PropertyDescriptorCollection; overload;
>    function GetEditor(editorBaseType : System.Type) : TObject;
>    function GetPropertyOwner(pd : PropertyDescriptor) : TObject;
> end;
>
>
> and my new TPerson class is:
> TPerson = class(TMyClass)
>   fPersonName : String;
>   fPersonSurName : String;
>   fPersonAge : Integer;
> published
>   property PersonName : String read fPersonName write fPersonName;
>   property PersonSurname : String read fPersonSurname write
> fPersonSurname;
>   property PersonAge : Integer read fPersonAge write fPersonAge;
> end;
>
> **************** IMPLEMENTATIONS BELOW *********************************
> { TMyDescriptor }
>
> function TMyDescriptor.CanResetValue(comp: TObject): Boolean;
> begin
>   Result := base.CanResetValue(comp);
> end;
>
>
> constructor TMyDescriptor.Create(baseP: PropertyDescriptor;
> filter: TArrayOfAttribute);
> begin
> inherited Create(baseP, filter);
> Self.base := baseP;
> end;
>
> constructor TMyDescriptor.Create(baseP: PropertyDescriptor);
> begin
> inherited Create(baseP);
> Self.base := baseP;
> end;
>
> function TMyDescriptor.GetComponentType: &Type;
> begin
> Result := base.ComponentType;
> end;
>
> function TMyDescriptor.GetDisplayName: String;
> begin
> Result := GetCustomNames(base.Name);
> end;
>
> function TMyDescriptor.Getir(baseName : String): String;
> begin
> if baseName = 'PersonName' then Result := 'Names of the Personel';
> if baseName = 'PersonSurname' then Result := 'Surname of the personel';
> if baseName = 'PersonAge' then Result := 'Age of the personel';
> end;
>
> function TMyDescriptor.GetIsReadOnly: Boolean;
> begin
> Result := base.IsReadOnly;
> end;
>
> function TMyDescriptor.GetName: String;
> begin
> Result := base.Name;
> end;
>
>
> function TMyDescriptor.GetPropertyType: &Type;
> begin
> Result := base.PropertyType;
> end;
>
> function TMyDescriptor.GetValue(comp: TObject): TObject;
> begin
> Result := base.GetValue(comp);
> end;
>
>
> procedure TMyDescriptor.ResetValue(comp: TObject);
> begin
> base.ResetValue(comp);
> end;
>
> procedure TMyDescriptor.SetValue(comp, Value: TObject);
> begin
> base.SetValue(comp, value);
> end;
>
> function TMyDescriptor.ShouldSerializeValue(comp: TObject): Boolean;
> begin
> Result := base.ShouldSerializeValue(comp);
> end;
>
> { TMyClass }
>
> function TMyClass.GetProperties(
> filter: TArrayOfAttribute): PropertyDescriptorCollection;
> var
> baseProps : PropertyDescriptorCollection;
> newProps : array of PropertyDescriptor;
> iCounter : Integer;
> oldname,
> newname   : String;
> begin
> baseProps := TypeDescriptor.GetProperties(GetType(), filter);
>
> SetLength(newProps, baseProps.Count);
>
> for iCounter := 0 to baseProps.Count do
> begin
>    newProps[iCounter] := TMyDescriptor.Create(baseProps[iCounter],
> filter); // An error occured : E2402 constructing instance of abstract
> class..
>    oldname := PropertyDescriptor(baseProps[iCounter]).DisplayName;
>    newName := TMyDescriptor(newProps[iCounter]).DisplayName;
> end;
>
> Result := PropertyDescriptorCollection.Create(newProps);
> end;
>
> function TMyClass.GetAttributes: AttributeCollection;
> begin
> Result := TypeDescriptor.GetAttributes(Self, true);
> end;
>
> function TMyClass.GetClassName: String;
> begin
> Result := TypeDescriptor.GetClassName(Self, true);
> end;
>
> function TMyClass.GetComponentName: String;
> begin
> Result := TypeDescriptor.GetComponentName(Self, true);
> end;
>
> function TMyClass.GetConverter: TypeConverter;
> begin
> Result := TypeDescriptor.GetConverter(Self, true);
> end;
>
> function TMyClass.GetDefaultEvent: EventDescriptor;
> begin
> Result := TypeDescriptor.GetDefaultEvent(Self, true);
> end;
>
> function TMyClass.GetDefaultProperty: PropertyDescriptor;
> begin
> Result := TypeDescriptor.GetDefaultProperty(Self, true);
> end;
>
> function TMyClass.GetEditor(editorBaseType: System.Type): TObject;
> begin
> Result := TypeDescriptor.GetEditor(Self, editorBaseType, true);
> end;
>
> function TMyClass.GetEvents: EventDescriptorCollection;
> begin
> Result := TypeDescriptor.GetEvents(Self, true);
> end;
>
> function TMyClass.GetEvents(
> attributes: TArrayOfAttribute): EventDescriptorCollection;
> begin
> Result := TypeDescriptor.GetEvents(Self, attributes, true);
> end;
>
> function TMyClass.GetProperties: PropertyDescriptorCollection;
> begin
> Result := TypeDescriptor.GetProperties(Self, true);
> end;
>
> function TMyClass.GetPropertyOwner(pd: PropertyDescriptor): TObject;
> begin
> Result := Self;
> end;
>
>
> I dont understand what is this. Can anybody helps me , how can i
> subclassing PropertyDescriptor class correctly ??
>
>
> Even we take an error when using delphi.net , we dont take any error
> message using c#,
>
> i want change the display name of the property which is the added to my
> special class by using the propertyGrid Component ...
> It's seems like DisplayNameAttirubute of the .net Framework 2.0
>
> With My Best Regards,
>
> Thanks For Helping
>

4 Dec 2006 7:01 PM

Gabriel Lozano-Morán

DisplayNameAttribute found in System.ComponentModel

Gabriel Lozano-Morán

Show quote

"Tugrul HELVACI" <king_of_del***@hotmail.com> wrote in message
news:%23deORV7FHHA.2464@TK2MSFTNGP06.phx.gbl...
> I'm using Delphi 2006 and I have a class defination like this:
>
> TPerson = class
> fPersonName : String;
> fPersonSurName : String;
> fPersonAge : Integer;
> published
> property PersonName : String read fPersonName write fPersonName;
> property PersonSurname : String read fPersonSurname write fPersonSurname;
> property PersonAge : Integer read fPersonAge write fPersonAge;
> end;
>
> and i want to display my class instance using PropertyGrid,so...
>
> var
> mPerson : TPerson;
> begin
> mPerson := TPerson.Create;
> mPerson.PersonName := 'Tugrul';
> mPerson.PersonSurname := 'HELVACI';
> mPerson.PersonAge := 31;
> PropertyGrid1.SelectedObject := mPerson;
> end;
>
> at the above code i can see my class instance in the property grid.
> But i want to change property display names in the propertygrid component.
> Because of these, i was searching on the net and i found
> PropertyDescriptor abstract class
> and ICustomTypeConverter interface.
>
> i implemented theese classes following:
>
> TArrayOfAttribute = array of Attribute;
> TMyDescriptor = class(PropertyDescriptor)
> private
>    base : PropertyDescriptor;
>    fName: String;
>
>    function GetName : String;
>    function GetDisplayName : String;
>    function GetIsReadOnly : Boolean;
>    function GetComponentType : &Type;
>    function GetPropertyType : &Type;
>
>    function GetCustomNames(baseName : String) : String; // my custom names
> getter function
> public
>    constructor Create(baseP : PropertyDescriptor; filter :
> TArrayOfAttribute); overload; virtual;
>    constructor Create(baseP : PropertyDescriptor); overload; virtual;
>
>    function CanResetValue(comp : TObject) : Boolean;
>    function GetValue(comp : TObject) : TObject;
>
>    procedure ResetValue(comp : TObject);
>    procedure SetValue(comp : TObject; Value : TObject);
>    function ShouldSerializeValue(comp : TObject) : Boolean;
>
>
>    property Name : String read GetName;
>    property DisplayName : String read GetDisplayName;
>    property IsReadOnly : Boolean read GetIsReadOnly;
>    property ComponentType : &Type read GetComponentType;
>    property PropertyType : &Type read GetPropertyType;
> end;
>
> TMyClass = class(TInterfacedObject, ICustomTypeDescriptor)
> public
>    function GetProperties(filter : TArrayOfAttribute) :
> PropertyDescriptorCollection; overload;
>    function GetAttributes : AttributeCollection;
>    function GetClassName : String;
>    function GetComponentName : String;
>    function GetConverter : TypeConverter;
>    function GetDefaultEvent : EventDescriptor;
>
>    function GetEvents(attributes : TArrayOfAttribute) :
> EventDescriptorCollection; overload;
>    function GetEvents : EventDescriptorCollection; overload;
>    function GetDefaultProperty : PropertyDescriptor;
>
>    function GetProperties : PropertyDescriptorCollection; overload;
>    function GetEditor(editorBaseType : System.Type) : TObject;
>    function GetPropertyOwner(pd : PropertyDescriptor) : TObject;
> end;
>
>
> and my new TPerson class is:
> TPerson = class(TMyClass)
>   fPersonName : String;
>   fPersonSurName : String;
>   fPersonAge : Integer;
> published
>   property PersonName : String read fPersonName write fPersonName;
>   property PersonSurname : String read fPersonSurname write
> fPersonSurname;
>   property PersonAge : Integer read fPersonAge write fPersonAge;
> end;
>
> **************** IMPLEMENTATIONS BELOW *********************************
> { TMyDescriptor }
>
> function TMyDescriptor.CanResetValue(comp: TObject): Boolean;
> begin
>   Result := base.CanResetValue(comp);
> end;
>
>
> constructor TMyDescriptor.Create(baseP: PropertyDescriptor;
> filter: TArrayOfAttribute);
> begin
> inherited Create(baseP, filter);
> Self.base := baseP;
> end;
>
> constructor TMyDescriptor.Create(baseP: PropertyDescriptor);
> begin
> inherited Create(baseP);
> Self.base := baseP;
> end;
>
> function TMyDescriptor.GetComponentType: &Type;
> begin
> Result := base.ComponentType;
> end;
>
> function TMyDescriptor.GetDisplayName: String;
> begin
> Result := GetCustomNames(base.Name);
> end;
>
> function TMyDescriptor.Getir(baseName : String): String;
> begin
> if baseName = 'PersonName' then Result := 'Names of the Personel';
> if baseName = 'PersonSurname' then Result := 'Surname of the personel';
> if baseName = 'PersonAge' then Result := 'Age of the personel';
> end;
>
> function TMyDescriptor.GetIsReadOnly: Boolean;
> begin
> Result := base.IsReadOnly;
> end;
>
> function TMyDescriptor.GetName: String;
> begin
> Result := base.Name;
> end;
>
>
> function TMyDescriptor.GetPropertyType: &Type;
> begin
> Result := base.PropertyType;
> end;
>
> function TMyDescriptor.GetValue(comp: TObject): TObject;
> begin
> Result := base.GetValue(comp);
> end;
>
>
> procedure TMyDescriptor.ResetValue(comp: TObject);
> begin
> base.ResetValue(comp);
> end;
>
> procedure TMyDescriptor.SetValue(comp, Value: TObject);
> begin
> base.SetValue(comp, value);
> end;
>
> function TMyDescriptor.ShouldSerializeValue(comp: TObject): Boolean;
> begin
> Result := base.ShouldSerializeValue(comp);
> end;
>
> { TMyClass }
>
> function TMyClass.GetProperties(
> filter: TArrayOfAttribute): PropertyDescriptorCollection;
> var
> baseProps : PropertyDescriptorCollection;
> newProps : array of PropertyDescriptor;
> iCounter : Integer;
> oldname,
> newname   : String;
> begin
> baseProps := TypeDescriptor.GetProperties(GetType(), filter);
>
> SetLength(newProps, baseProps.Count);
>
> for iCounter := 0 to baseProps.Count do
> begin
>    newProps[iCounter] := TMyDescriptor.Create(baseProps[iCounter],
> filter); // An error occured : E2402 constructing instance of abstract
> class..
>    oldname := PropertyDescriptor(baseProps[iCounter]).DisplayName;
>    newName := TMyDescriptor(newProps[iCounter]).DisplayName;
> end;
>
> Result := PropertyDescriptorCollection.Create(newProps);
> end;
>
> function TMyClass.GetAttributes: AttributeCollection;
> begin
> Result := TypeDescriptor.GetAttributes(Self, true);
> end;
>
> function TMyClass.GetClassName: String;
> begin
> Result := TypeDescriptor.GetClassName(Self, true);
> end;
>
> function TMyClass.GetComponentName: String;
> begin
> Result := TypeDescriptor.GetComponentName(Self, true);
> end;
>
> function TMyClass.GetConverter: TypeConverter;
> begin
> Result := TypeDescriptor.GetConverter(Self, true);
> end;
>
> function TMyClass.GetDefaultEvent: EventDescriptor;
> begin
> Result := TypeDescriptor.GetDefaultEvent(Self, true);
> end;
>
> function TMyClass.GetDefaultProperty: PropertyDescriptor;
> begin
> Result := TypeDescriptor.GetDefaultProperty(Self, true);
> end;
>
> function TMyClass.GetEditor(editorBaseType: System.Type): TObject;
> begin
> Result := TypeDescriptor.GetEditor(Self, editorBaseType, true);
> end;
>
> function TMyClass.GetEvents: EventDescriptorCollection;
> begin
> Result := TypeDescriptor.GetEvents(Self, true);
> end;
>
> function TMyClass.GetEvents(
> attributes: TArrayOfAttribute): EventDescriptorCollection;
> begin
> Result := TypeDescriptor.GetEvents(Self, attributes, true);
> end;
>
> function TMyClass.GetProperties: PropertyDescriptorCollection;
> begin
> Result := TypeDescriptor.GetProperties(Self, true);
> end;
>
> function TMyClass.GetPropertyOwner(pd: PropertyDescriptor): TObject;
> begin
> Result := Self;
> end;
>
>
> I dont understand what is this. Can anybody helps me , how can i
> subclassing PropertyDescriptor class correctly ??
>
>
> Even we take an error when using delphi.net , we dont take any error
> message using c#,
>
> i want change the display name of the property which is the added to my
> special class by using the propertyGrid Component ...
> It's seems like DisplayNameAttirubute of the .net Framework 2.0
>
> With My Best Regards,
>
> Thanks For Helping
>

5 Dec 2006 11:41 AM

Tuðrul HELVACI

DisplayNameAttribute is in .Net Framework 2.0 only not 1.1..
Unfortunatelly Delphi 2006 supports 1.1

Any other answer ??

Show quote

"Gabriel Lozano-Morán" <ab***@frontbridge.com> wrote in message
news:uyl2Ua9FHHA.2464@TK2MSFTNGP06.phx.gbl...
> DisplayNameAttribute found in System.ComponentModel
>
> Gabriel Lozano-Morán
>
> "Tugrul HELVACI" <king_of_del***@hotmail.com> wrote in message
> news:%23deORV7FHHA.2464@TK2MSFTNGP06.phx.gbl...
>> I'm using Delphi 2006 and I have a class defination like this:
>>
>> TPerson = class
>> fPersonName : String;
>> fPersonSurName : String;
>> fPersonAge : Integer;
>> published
>> property PersonName : String read fPersonName write fPersonName;
>> property PersonSurname : String read fPersonSurname write
>> fPersonSurname;
>> property PersonAge : Integer read fPersonAge write fPersonAge;
>> end;
>>
>> and i want to display my class instance using PropertyGrid,so...
>>
>> var
>> mPerson : TPerson;
>> begin
>> mPerson := TPerson.Create;
>> mPerson.PersonName := 'Tugrul';
>> mPerson.PersonSurname := 'HELVACI';
>> mPerson.PersonAge := 31;
>> PropertyGrid1.SelectedObject := mPerson;
>> end;
>>
>> at the above code i can see my class instance in the property grid.
>> But i want to change property display names in the propertygrid
>> component.
>> Because of these, i was searching on the net and i found
>> PropertyDescriptor abstract class
>> and ICustomTypeConverter interface.
>>
>> i implemented theese classes following:
>>
>> TArrayOfAttribute = array of Attribute;
>> TMyDescriptor = class(PropertyDescriptor)
>> private
>>    base : PropertyDescriptor;
>>    fName: String;
>>
>>    function GetName : String;
>>    function GetDisplayName : String;
>>    function GetIsReadOnly : Boolean;
>>    function GetComponentType : &Type;
>>    function GetPropertyType : &Type;
>>
>>    function GetCustomNames(baseName : String) : String; // my custom
>> names getter function
>> public
>>    constructor Create(baseP : PropertyDescriptor; filter :
>> TArrayOfAttribute); overload; virtual;
>>    constructor Create(baseP : PropertyDescriptor); overload; virtual;
>>
>>    function CanResetValue(comp : TObject) : Boolean;
>>    function GetValue(comp : TObject) : TObject;
>>
>>    procedure ResetValue(comp : TObject);
>>    procedure SetValue(comp : TObject; Value : TObject);
>>    function ShouldSerializeValue(comp : TObject) : Boolean;
>>
>>
>>    property Name : String read GetName;
>>    property DisplayName : String read GetDisplayName;
>>    property IsReadOnly : Boolean read GetIsReadOnly;
>>    property ComponentType : &Type read GetComponentType;
>>    property PropertyType : &Type read GetPropertyType;
>> end;
>>
>> TMyClass = class(TInterfacedObject, ICustomTypeDescriptor)
>> public
>>    function GetProperties(filter : TArrayOfAttribute) :
>> PropertyDescriptorCollection; overload;
>>    function GetAttributes : AttributeCollection;
>>    function GetClassName : String;
>>    function GetComponentName : String;
>>    function GetConverter : TypeConverter;
>>    function GetDefaultEvent : EventDescriptor;
>>
>>    function GetEvents(attributes : TArrayOfAttribute) :
>> EventDescriptorCollection; overload;
>>    function GetEvents : EventDescriptorCollection; overload;
>>    function GetDefaultProperty : PropertyDescriptor;
>>
>>    function GetProperties : PropertyDescriptorCollection; overload;
>>    function GetEditor(editorBaseType : System.Type) : TObject;
>>    function GetPropertyOwner(pd : PropertyDescriptor) : TObject;
>> end;
>>
>>
>> and my new TPerson class is:
>> TPerson = class(TMyClass)
>>   fPersonName : String;
>>   fPersonSurName : String;
>>   fPersonAge : Integer;
>> published
>>   property PersonName : String read fPersonName write fPersonName;
>>   property PersonSurname : String read fPersonSurname write
>> fPersonSurname;
>>   property PersonAge : Integer read fPersonAge write fPersonAge;
>> end;
>>
>> **************** IMPLEMENTATIONS BELOW *********************************
>> { TMyDescriptor }
>>
>> function TMyDescriptor.CanResetValue(comp: TObject): Boolean;
>> begin
>>   Result := base.CanResetValue(comp);
>> end;
>>
>>
>> constructor TMyDescriptor.Create(baseP: PropertyDescriptor;
>> filter: TArrayOfAttribute);
>> begin
>> inherited Create(baseP, filter);
>> Self.base := baseP;
>> end;
>>
>> constructor TMyDescriptor.Create(baseP: PropertyDescriptor);
>> begin
>> inherited Create(baseP);
>> Self.base := baseP;
>> end;
>>
>> function TMyDescriptor.GetComponentType: &Type;
>> begin
>> Result := base.ComponentType;
>> end;
>>
>> function TMyDescriptor.GetDisplayName: String;
>> begin
>> Result := GetCustomNames(base.Name);
>> end;
>>
>> function TMyDescriptor.Getir(baseName : String): String;
>> begin
>> if baseName = 'PersonName' then Result := 'Names of the Personel';
>> if baseName = 'PersonSurname' then Result := 'Surname of the personel';
>> if baseName = 'PersonAge' then Result := 'Age of the personel';
>> end;
>>
>> function TMyDescriptor.GetIsReadOnly: Boolean;
>> begin
>> Result := base.IsReadOnly;
>> end;
>>
>> function TMyDescriptor.GetName: String;
>> begin
>> Result := base.Name;
>> end;
>>
>>
>> function TMyDescriptor.GetPropertyType: &Type;
>> begin
>> Result := base.PropertyType;
>> end;
>>
>> function TMyDescriptor.GetValue(comp: TObject): TObject;
>> begin
>> Result := base.GetValue(comp);
>> end;
>>
>>
>> procedure TMyDescriptor.ResetValue(comp: TObject);
>> begin
>> base.ResetValue(comp);
>> end;
>>
>> procedure TMyDescriptor.SetValue(comp, Value: TObject);
>> begin
>> base.SetValue(comp, value);
>> end;
>>
>> function TMyDescriptor.ShouldSerializeValue(comp: TObject): Boolean;
>> begin
>> Result := base.ShouldSerializeValue(comp);
>> end;
>>
>> { TMyClass }
>>
>> function TMyClass.GetProperties(
>> filter: TArrayOfAttribute): PropertyDescriptorCollection;
>> var
>> baseProps : PropertyDescriptorCollection;
>> newProps : array of PropertyDescriptor;
>> iCounter : Integer;
>> oldname,
>> newname   : String;
>> begin
>> baseProps := TypeDescriptor.GetProperties(GetType(), filter);
>>
>> SetLength(newProps, baseProps.Count);
>>
>> for iCounter := 0 to baseProps.Count do
>> begin
>>    newProps[iCounter] := TMyDescriptor.Create(baseProps[iCounter],
>> filter); // An error occured : E2402 constructing instance of abstract
>> class..
>>    oldname := PropertyDescriptor(baseProps[iCounter]).DisplayName;
>>    newName := TMyDescriptor(newProps[iCounter]).DisplayName;
>> end;
>>
>> Result := PropertyDescriptorCollection.Create(newProps);
>> end;
>>
>> function TMyClass.GetAttributes: AttributeCollection;
>> begin
>> Result := TypeDescriptor.GetAttributes(Self, true);
>> end;
>>
>> function TMyClass.GetClassName: String;
>> begin
>> Result := TypeDescriptor.GetClassName(Self, true);
>> end;
>>
>> function TMyClass.GetComponentName: String;
>> begin
>> Result := TypeDescriptor.GetComponentName(Self, true);
>> end;
>>
>> function TMyClass.GetConverter: TypeConverter;
>> begin
>> Result := TypeDescriptor.GetConverter(Self, true);
>> end;
>>
>> function TMyClass.GetDefaultEvent: EventDescriptor;
>> begin
>> Result := TypeDescriptor.GetDefaultEvent(Self, true);
>> end;
>>
>> function TMyClass.GetDefaultProperty: PropertyDescriptor;
>> begin
>> Result := TypeDescriptor.GetDefaultProperty(Self, true);
>> end;
>>
>> function TMyClass.GetEditor(editorBaseType: System.Type): TObject;
>> begin
>> Result := TypeDescriptor.GetEditor(Self, editorBaseType, true);
>> end;
>>
>> function TMyClass.GetEvents: EventDescriptorCollection;
>> begin
>> Result := TypeDescriptor.GetEvents(Self, true);
>> end;
>>
>> function TMyClass.GetEvents(
>> attributes: TArrayOfAttribute): EventDescriptorCollection;
>> begin
>> Result := TypeDescriptor.GetEvents(Self, attributes, true);
>> end;
>>
>> function TMyClass.GetProperties: PropertyDescriptorCollection;
>> begin
>> Result := TypeDescriptor.GetProperties(Self, true);
>> end;
>>
>> function TMyClass.GetPropertyOwner(pd: PropertyDescriptor): TObject;
>> begin
>> Result := Self;
>> end;
>>
>>
>> I dont understand what is this. Can anybody helps me , how can i
>> subclassing PropertyDescriptor class correctly ??
>>
>>
>> Even we take an error when using delphi.net , we dont take any error
>> message using c#,
>>
>> i want change the display name of the property which is the added to my
>> special class by using the propertyGrid Component ...
>> It's seems like DisplayNameAttirubute of the .net Framework 2.0
>>
>> With My Best Regards,
>>
>> Thanks For Helping
>>
>
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