Question

Seems like i need some help with a project.
I have a routine , that constructs run time multiple TabItems on to a page control in firemonkey, and i want to have a close button on the tab.
The new tab has a checkbox for the close button loading from the styler of the tabitems.
The page has a default tab, and within some button, i am adding run time the new tab items.
I have managed to apply the event for closing the default tab page, but doesn’t work within the run time created tab pages. Any help would be appreciated.

This is the piece of code for the runtime tabitems

procedure TForm1.Button1Click(Sender: TObject);
var
  t : TTabItem;
  o : TFmxObject;
  i : Integer;
  c : TControl;
begin
  t := TTabItem.Create(pgeControl);

  t.Parent := pgeControl;

  o := FindBinding('imgCloseTabPage');
  if o<>nil then
  begin
    for i := 0 to ComponentCount - 1 do
    begin
      if Components[i] is TCheckBox then
      begin
        TCheckBox(Components[i]).OnClick := CheckBox1Click;
      end;
    end;
  end;

  if pgeControl.TabCount - 1 <= nTab then
  begin
    nTab := nTab + 1;
    t.Index := nTab
  end
  else
  begin
    t.Index := pgeControl.TabCount - 1;
    nTab := pgeControl.TabCount - 1;
  end;
  t.Tag := nTab;

  t.Text := 'Some text...' + ' ' + IntToStr(nTab);
  t.Name := 'tabPatient' + IntToStr(nTab);

  t.Height := 35;
  t.Width := 250;
  t.Margins.Top := 0;
  t.Margins.Left := 0;
  t.Margins.Bottom := 0;
  t.Margins.Right := 0;

  t.Padding.Top := -5;
  t.Padding.Left := 0;
  t.Padding.Bottom := 0;
  t.Padding.Right := 0;

  t.TextAlign := TTextAlign.taLeading;
  t.Width := (Length(t.Text) * 6 ) + 60;
  t.Font.Size := 15;
  t.StyleLookup := 'tabMainStyle1';

  l := TLayout.Create(t);
  l.Parent := t;
  l.Align := TAlignLayout.alClient;
  l.Margins.Top := -5;
  l.Margins.Left := 5;
  l.Margins.Right := 5;
  l.Margins.Bottom := 5;
  l.Padding.Top := 0;
  l.Padding.Left := 0;
  l.Padding.Bottom := 0;
  l.Padding.Right := 0;

  pgeControl.ActiveTab := pgeControl.Tabs[pgeControl.TabCount - 1];
end;

Answer 1

You shoud call FindBinding after having applyed the custom style. Currently you call this before, so it can’t find the object. Additionally there was a mistake when you was looking for the object.

so put this

o := t.FindBinding('imgCloseTabPage');
if o<>nil then
begin
  if o is TCheckBox then
    TCheckBox(o).OnClick := CheckBox1Click;
end;

after

t.StyleLookup := 'tabMainStyle1';

and the event should assigned.