This article
CandyCat collection of "Programming the form of a translucent effect (Author: Luo Qiang)," a text revisions for BCB Win2000 use.
Use the control to use
BTW: Inside, there is no BCB, have to stick to Delphi
head File:
/ / -------------------------------------------------------------------------------------------- ---------------------------
#ifndef TransparentFormh
#define transparentformh
/ / -------------------------------------------------------------------------------------------- ---------------------------
#include
#include
#include
#include
/ / -------------------------------------------------------------------------------------------- ---------------------------
Class Package TTRANSPARENTFORM: PUBLIC TCOMPONENT
{
Private:
protected:
INT M_NALPHAVALUE;
HWND M_HParentFormHandle;
Void __fastcall setalphavalue (int nalpha);
Void __fastcall updatedisplay ();
PUBLIC:
__fastcall ttransparentform (Tcomponent * Owner);
__publish:
__Property int alphavalue = {read = m_nalphavalue, write = setalphavalue, default = 0};
}
/ / -------------------------------------------------------------------------------------------- ---------------------------
#ENDIF
CPP file:
/ / -------------------------------------------------------------------------------------------- ---------------------------
#include
#pragma HDRSTOP
#include "transparentform.h"
#pragma package (smart_init)
/ / -------------------------------------------------------------------------------------------- ---------------------------
// ValidcTrcheck IS Used To Assure That The Components Created Do Not Have
// ann of Pure Virtual functions.
//
Static Inline Void ValidcTrcheck (TTRANSPARENTFORM *)
{
New TTRANSPARENTFORM (NULL);
}
/ / -------------------------------------------------------------------------------------------- ---------------------------
__fastcall TTRANSPARENTFORM :: TTRANSPARENTFORM (Tcomponent * Owner)
: Tcomponent (Owner)
{
ComponentState.Contains (csdesigning))
Return; m_nalphavalue = 255;
m_hparentformhandle = ((TForm *) (OWNER)) -> Handle;
Setwindowlong (M_HParentFormHandle, GWL_EXSTYLE, GETWINDOWLONG (M_HParentFormHandle, GWL_EXSTYLE) | WS_EX_LAYERED);
}
/ / -------------------------------------------------------------------------------------------- ---------------------------
Namespace Transparentform
{
Void __fastcall package register ()
{
TcomponentClass Classes [1] = {__ClassID (TTRANSPARENTFORM)}
Registercomponents ("EasySoft", Classes, 0);
}
}
/ / -------------------------------------------------------------------------------------------- ---------------------------
Void __fastcall ttransparentform :: setalphavalue (int nalpha)
{
IF (nalpha> = 0 && nalpha <256)
{
m_nalphavalue = nalpha;
Updatedisplay ();
}
}
Void __fastcall ttransparentform :: updatedInsplay ()
{
ComponentState.Contains (csdesigning))
Return;
SetlayeredWindowAttributes (M_HParentFormHandle, 0, M_NALPHAVALUE, 2);
}
//wei@shijun.com
//http://www.shijun.com
// 5/19/2001
