On 18.02.2018 17:19, Giuliano Colla wrote:
Il 18/02/2018 11:54, Ondrej Pokorny ha scritto:
What events are generated?
onFormPaint
Do you mean TForm.OnPaint?
---
No, no, no, no. Setting MyLabel.Color and any other visual property does
NOT fire any paint event/method/whatever - neither in Delphi nor in
Lazarus. Instead a repaint is requested with Invalidate/InvalidateRect
that is then handled when the WM_PAINT message is received.
I really don't know where you got this information from. Or did I
misunderstand you?
Ondrej
---
PS: A test project:
unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;
type
TForm1 = class(TForm)
Label1: TLabel;
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure FormPaint(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
Writeln('1');
Label1.Color := clRed;
Writeln('2');
Label1.Color := clGreen;
Writeln('3');
end;
procedure TForm1.FormPaint(Sender: TObject);
begin
Caption := IntToStr(StrToIntDef(Caption, 0)+1);
Writeln('paint');
end;
end.
object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 561
ClientWidth = 391
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
OnPaint = FormPaint
PixelsPerInch = 96
TextHeight = 13
object Label1: TLabel
Left = 80
Top = 112
Width = 31
Height = 13
Caption = 'Label1'
end
object Button1: TButton
Left = 80
Top = 155
Width = 75
Height = 25
Caption = 'Button1'
TabOrder = 0
OnClick = Button1Click
end
end
--
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