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how to get link on class in another class through parent ?


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#1 elGringo

elGringo

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Posted 15 April 2018 - 11:44 AM

Hi, having 2 classes

 

1 frame is created on another Second frame

on 1 frame there is TUniLabel for example

i'm trying to handle onClick event of label in Second frame and assign it

like

FOL[i].lName.OnClick := OnClickElement; 

here i have "Invalid type Cast"

procedure TLeftMenu2.OnClickElement(Sender: TObject);
var
  i: integer;
begin
  showmessage( //
    ((Sender as TUniLabel).Parent as TLeftMenu2Element).ClassName // << invalid type Cast
  ); //
end;

As Delphi coder I'm doing everything correct, but as UniGUI coder i'm being not so experienced

 

i tried to do things like

procedure TLeftMenu2.OnClickElement(Sender: TObject);
var
  i: integer;
begin
  showmessage( //
    ((Sender as TUniLabel).Parent.Parent).ClassName //
  ); //
end; 

and on click i have TUniSimplePanel - which is not my class.

 

Is any way to get instance of TLeftMenu2Element - 1 frame on click in 2 frame?

 

 

Below full code of 2 frames

unit uLeftMenu2Element;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  uniGUITypes, uniGUIAbstractClasses, uniGUIClasses, uniGUIFrame,
  uniGUIBaseClasses, uniPanel, uniImage, uniLabel;

type
  TLeftMenu2Element = class(TUniFrame)
    iPic: TUniImage;
    lName: TUniLabel;
    procedure UniFrameCreate(Sender: TObject);
    procedure iPicClick(Sender: TObject);
    procedure lNameClick(Sender: TObject);
  private
    FIsExpanded: boolean;
    procedure SetIsExpanded(const Value: boolean);
    { Private declarations }
  public
    { Public declarations }
    property IsExpanded: boolean read FIsExpanded write SetIsExpanded;
  end;

implementation

{$R *.dfm}

uses
  uLeftMenu2;

procedure TLeftMenu2Element.iPicClick(Sender: TObject);
begin
  if FIsExpanded then
  begin
    FIsExpanded := false;
    iPic.Picture.LoadFromFile('pics/arrowRight16x16.png')
  end
  else
  // if not expanded
  begin
    FIsExpanded := true;
    iPic.Picture.LoadFromFile('pics/arrowDown16x16.png');

  end;
end;

procedure TLeftMenu2Element.lNameClick(Sender: TObject);
begin
//
end;

procedure TLeftMenu2Element.SetIsExpanded(const Value: boolean);
begin
  FIsExpanded := Value;
end;

procedure TLeftMenu2Element.UniFrameCreate(Sender: TObject);
begin
  iPic.Picture.LoadFromFile('pics/arrowRight16x16.png');
  lName.Top := trunc(Self.Height / 2 - lName.Height / 2);
  iPic.Top := trunc(Self.Height / 2 - iPic.Height / 2);
end;

end.

And another class

unit uLeftMenu2;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  uniGUITypes, uniGUIAbstractClasses, uniGUIClasses, uniGUIFrame,
  uLeftMenu2Element, System.Generics.Collections, uniGUIBaseClasses, uniPanel;

type
  TLeftMenu2 = class(TUniFrame)
    procedure UniFrameCreate(Sender: TObject);
    procedure UniFrameDestroy(Sender: TObject);
  private
    { Private declarations }
    FOL: TObjectList<TLeftMenu2Element>;
    procedure OnClickElement(Sender: TObject);
  public
    { Public declarations }
    procedure LoadGoodsTree;
//    procedure LoadChildren(aID: integer);
  end;

implementation

uses
  FireDAC.Comp.Client, MainModule, uniLabel;

{$R *.dfm}

procedure TLeftMenu2.LoadGoodsTree;

  procedure loadNullLevel();
  var
    q: TFDquery;
    i: integer;
    h: integer;
    itemName: string;
  begin
    h := 0;
    q := TFDquery.Create(nil);
    try
      with q do
      begin
        Connection := UniMainModule.DB.FDConnection;
        sql.Text := 'SELECT * FROM sewworld_db.goods where idParent is NULL order by sortIndex';
        Disconnect();
        Open;
        while not EOF do
        begin
          i := FOL.Add(TLeftMenu2Element.Create(Self));
          itemName := FieldByName('name').AsString;
          if itemName.Length > 15 then
            itemName := itemName.Substring(0, 15) + '...';
          FOL[i].lName.Caption := itemName;
          FOL[i].Parent := Self;
          FOL[i].Left := 0;
          FOL[i].Top := h;
          FOL[i].Show;
          FOL[i].lName.OnClick := OnClickElement;
          h := h + FOL[i].Height;
          Next;
        end;
        Close;
      end;
    finally
      q.Free;
    end;
  end;

begin
  loadNullLevel();
end;

procedure TLeftMenu2.OnClickElement(Sender: TObject);
var
  i: integer;
begin
  showmessage( //
    ((Sender as TUniLabel).Parent as TLeftMenu2Element).ClassName //
  ); //
end;

procedure TLeftMenu2.UniFrameCreate(Sender: TObject);
begin
  FOL := TObjectList<TLeftMenu2Element>.Create;
end;

procedure TLeftMenu2.UniFrameDestroy(Sender: TObject);
begin
  FOL.Free;
end;

end.


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#2 elGringo

elGringo

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Posted 15 April 2018 - 12:32 PM

Asked myself - answered myself

 

my workAround

procedure TLeftMenu2.OnClickElement(Sender: TObject);

  function getLeftMenuElement(aID: integer): TLeftMenu2Element;
  var
    i: Integer;
  begin
    Result := nil;
    for i := 0 to FOL.Count - 1 do
      if FOL[i].Tag = aID then
      begin
        result := FOL[i];
        break;
      end;
  end;

var
  leftMenu2Element: TLeftMenu2Element;
begin
  if (Sender is TUniLabel) then
    leftMenu2Element := getLeftMenuElement((Sender as TUniLabel).Tag);
  showmessage(leftMenu2Element.lName.Caption);
end;


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