Delphi Tips

yuswaroengsoftware Blog’s Delphi Tutorial

Contoh program menambahkan event.

nit ColorBox;

interface

uses
Classes, Graphics, Controls, Windows;

type
TOnLeftBoxClick = procedure(Sender: TObject) of object;
TOnRightBoxClick = procedure(Sender: TObject) of object;
TColorBox = class(TGraphicControl)
private
FRgnL, FRgnR: TRect;
FOnLeftBoxSelect: TOnLeftBoxClick;
FOnRightBoxSelect: TOnRightBoxClick;
protected
procedure Paint; override;
procedure MouseDown(Button: TMouseButton;
Shift: TShiftState; X, Y: Integer); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
published
property OnBoxLClick: TOnLeftBoxClick
read FOnLeftBoxSelect write FOnLeftBoxSelect;
property OnBoxRClick: TOnRightBoxClick
read FOnRightBoxSelect write FOnRightBoxSelect;
end;

procedure Register;

implementation

constructor TColorBox.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
Height:=33;
Width:=61;
end;

destructor TColorBox.Destroy;
begin
inherited Destroy;
end;

procedure TColorBox.Paint;
var cp: Integer;
begin
with Canvas do
begin
Pen.Color:=clBtnHighlight;
MoveTo(0, Height-1); LineTo(0, 0); LineTo(Width-1, 0);
Pen.Color:=clBtnShadow;
LineTo(Width-1, Height-1); LineTo(1, Height-1);
end;

cp:=Width div 2;
{–left area–}
FRgnL.TopLeft:=Point(4, 4);
FRgnL.BottomRight:=Point(cp-1, Height-3);
{–right box–}
FRgnR.TopLeft:=Point(cp+1, 4);
FRgnR.BottomRight:=Point(Width-4, Height-4);

{–left box–}
Canvas.Brush.Color:=$00B7CAF7;
Canvas.Rectangle(4, 4, cp-1, Height-4);
{–right box–}
Canvas.Brush.Color:=$00F4D5C1;
Canvas.Rectangle(cp+1, 4, Width-4, Height-4);
end;

procedure TColorBox.MouseUp(Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
var p: TPoint;
begin
inherited MouseUp(Button, Shift, X, Y);
if Button <> mbLeft then Exit;
p:=Point(X, Y);
if PtInRect(FRgnL, p) then {–left box–}
begin
if Assigned(FOnLeftBoxSelect) then FOnLeftBoxSelect(Self);
Invalidate;
end
else if PtInRect(FRgnR, p) then {–right box–}
begin
if Assigned(FOnRightBoxSelect) then FOnRightBoxSelect(Self);
Invalidate;
end;
end;

procedure Register;
begin
RegisterComponents(’Demo’, [TColorBox]);
end;

end.

prosedur pembatasan gerakan mouse.

procedure TForm1.FormMouseMove(Sender: TObject;
Shift: TShiftState; X, Y: Integer);
begin
R:=Rect(Left, Top, Left+Width, Top+Height);
if GerakDalamForm then ClipCursor(@R)
else ClipCursor(@NilaiDefault);
end;

Cara Gampang Mengakses Array

var
MyArray : Array[2..11] of integer;
Position : integer;
begin
for Position := Low(MyArray) to High(MyArray) do
MyArray[Position] := 0;
end;

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Delphi Tips & Trick

• 1.Ganti warna font secara acak dengan fungsi random..ternyata simpel dan font jadi cantik.

Langkah - Langkahnya :
Pertama Siapkan 1label,1timer (atur interval timer=200)

procedure TForm1.Timer1Timer(Sender: TObject);
var
x : integer;
begin
label1.Font.Color:=random(x);
end;

NB: "bisa juga buat ngacak posisi object dalam sebuah form..bahkan buat kursor mouse gerak sendiri kayak Virus gitu" Twisted Evil

• 2.Menutup Aplikasi Dengan Animasi

{$R *.dfm}
// Autor: Yusfian Gunawan

var
tutup: Boolean;
i: Integer;

procedure TForm1.FormCreate(Sender: TObject);
begin
tutup := True;
timer1.Enabled := False;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
reg1, reg2: hrgn;
begin
if tutup = True then
begin
i := i + 10;
reg1 := CreateRoundRectRgn(0 + i, 0 + i, Width - i, Height - i, 20, 20);
SetWindowRgn(Handle, reg1, True);
end;

if i >= Width then
begin
tutup := False;
i := 1;
end;

if tutup = False then
begin
i := i + 10;
reg1 := CreateRectRgn(0, 0, (Width div 2) - i, Height);
reg2 := CreateRectRgn((Width div 2) + i, 0, Width, Height);
CombineRgn(reg1, reg1, reg2, rgn_or);
SetWindowRgn(Handle, reg1, True);
if i >= Width div 2 then
begin
tutup := True;
i := 1;
end;
end;

end;

procedure TForm1.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
var
reg1: hrgn;
begin
i := 1;
timer1.Enabled := True;
if MessageDlg('Anda Yakin Akan Keluar ?',
mtConfirmation, [mbYes, mbNo], 0) = mrYes then
CanClose := True
else
begin
CanClose := False;
timer1.Enabled := False;
reg1 := CreateRoundRectRgn(0, 0, Width, Height, 0, 0);
SetWindowRgn(Handle, reg1, True);
end;

end;

end.

• 3.Program Hanya Bisa Dujalankan Satu kali

procedure TForm1.FormCreate(Sender: TObject);
var
atom : integer;
begin
if GlobalFindAtom(NamaAtom) = 0 then
atom := GlobalAddAtom(NamaAtom)
else
begin
ShowMessage('Program ini hanya dapat dijalankan sekali dalam satu sesi Windows' + #10 + #13 +
'Untuk menjalankan program ini lagi, restart komputer Anda atau silahkan' + #10 + #13 +
'REGISTER !!');
Application.Terminate;
end;
end;

end.

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