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C++Builder 用GDI+实现半透明渐变的特效窗口
<?php
偶然间甜石榴兄弟给我一个东东，是BlueCrab用VC写的利用GDI+技术实现半透明渐变窗口的特效，看起来很不错。在此对BlueCrab和甜石榴深表感谢。ccrun(老妖)花了点时间将其在BCB中实现，并实现了简单的动态换肤。效果图：
在C++Builder中使用GDI+的方法和代码网上遍地都是，这里为了完整性，简单说说流程：
1.) 在BCB6中已自带了ghiplus.h文件，故只需要生成gdiplus.lib文件就可以:
在命令行下运行implib gdiplus.lib gdiplus.dll。(如果ghiplus.dll不在当前文件夹下,注意写完整路径)
2.) 在工程的编译选项中加入STRICT条件编译:
Project-->Options-->Directories/Conditionals-->Condtionals-->点击旁边的"..."按钮-->输入STRICT，然后Add。
3.) 在工程中加入Gdiplus.lib:
Project-->Add To Project-->找到Gdiplus.lib添加进来。
4.) 在工程的.h文件中包含所需的头文件,注意先后顺序:
#include "math.hpp"
#include <algorithm>
using std::min;
using std::max;
#include "gdiplus.h"
using namespace Gdiplus;
完整示例代码在这里下载(查看页面)http://www.ccrun.com/src/v.asp?id=36
.h文件中：
private: // User declarations
ULONG_PTR m_GdiplusToken;
Gdiplus::GdiplusStartupInput m_GdiplusStartupInput;
int __fastcall SetTransparent(LPWSTR lpSkinFile, int nTran);
BLENDFUNCTION m_Blend;
HDC m_hdcMemory;
Gdiplus::Image *m_Image;
public: // User declarations
__fastcall TfrmMain(TComponent* Owner);
__fastcall ~TfrmMain(void);
.cpp文件中：
//---------------------------------------------------------------------------
// 用GDI+实现半透明渐变的特效窗口
// by ccrun(老妖) - [email]info@ccrun.com[/email]
//---------------------------------------------------------------------------
// Welcome C++Builder Study - [url]http://www.ccrun.com[/url]
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "uMain.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TfrmMain *frmMain;
//---------------------------------------------------------------------------
__fastcall TfrmMain::TfrmMain(TComponent* Owner)
: TForm(Owner)
{
BorderStyle = bsNone;
// init GDI+
GdiplusStartup(&m_GdiplusToken, &m_GdiplusStartupInput, NULL);
//
m_Blend.BlendOp = 0; // the only BlendOp defined in Windows 2000
m_Blend.BlendFlags = 0; // nothing else is special ...
m_Blend.AlphaFormat = 1; // ...
m_Blend.SourceConstantAlpha = 255; // AC_SRC_ALPHA
//
if(FileExists(ExtractFilePath(ParamStr(0)) + "\test.png"))
SetTransparent(WideString("test.png"), 100);
// Stay on top
SetWindowPos(Handle, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
}
//---------------------------------------------------------------------------
__fastcall TfrmMain::~TfrmMain(void)
{
GdiplusShutdown(m_GdiplusToken); // Close GDI+
}
//---------------------------------------------------------------------------
int __fastcall TfrmMain::SetTransparent(LPWSTR lpSkinFile, int nTran)
{
// Use GDI+ load image
m_Image = Gdiplus::Image::FromFile(lpSkinFile);
// Change Form size
Width = m_Image->GetWidth();
Height = m_Image->GetHeight();
// Create Compatible Bitmap
HDC hdcTemp = GetDC(0);
m_hdcMemory = CreateCompatibleDC(hdcTemp);
HBITMAP hBitMap = CreateCompatibleBitmap(hdcTemp,
m_Image->GetWidth(), m_Image->GetHeight());
// 本文转自 C++Builder研究 - [url]http://www.ccrun.com/article.asp?i=643&d=n5u8o4[/url]
SelectObject(m_hdcMemory, hBitMap);
// Alpha Value
if (nTran<0 || nTran >100)
nTran = 100;
m_Blend.SourceConstantAlpha = int(nTran * 2.55); // 1~255
//
HDC hdcScreen = ::GetDC(0);
RECT rct;
GetWindowRect(Handle, &rct);
//
POINT ptWinPos = {rct.left, rct.top};
Gdiplus::Graphics graph(m_hdcMemory);
// 63 63 72 75 6E 2E 63 6F 6D
graph.DrawImage(m_Image, 0, 0, m_Image->GetWidth(), m_Image->GetHeight());
//
SIZE sizeWindow = {m_Image->GetWidth(), m_Image->GetHeight()};
POINT ptSrc = {0, 0};
// Set Window style
DWORD dwExStyle = GetWindowLong(Handle, GWL_EXSTYLE);
if((dwExStyle & 0x80000) != 0x80000)
SetWindowLong(Handle, GWL_EXSTYLE, dwExStyle ^ 0x80000);
// perform the alpha blend
BOOL bRet = UpdateLayeredWindow(Handle, hdcScreen, &ptWinPos,
&sizeWindow, m_hdcMemory, &ptSrc, 0, &m_Blend, 2);
//
graph.ReleaseHDC(m_hdcMemory);
ReleaseDC(0, hdcScreen);
hdcScreen = NULL;
ReleaseDC(0, hdcTemp);
hdcTemp = NULL;
DeleteObject(hBitMap);
DeleteDC(m_hdcMemory);
m_hdcMemory = NULL;
m_Image = NULL;
return bRet;
}
//---------------------------------------------------------------------------
void __fastcall TfrmMain::FormMouseDown(TObject *Sender,
TMouseButton Button, TShiftState Shift, int X, int Y)
{
if(Button == mbLeft)
{
ReleaseCapture();
Perform(WM_SYSCOMMAND, SC_MOVE | HTCAPTION, 0);
}
}
//---------------------------------------------------------------------------
void __fastcall TfrmMain::miShowAboutClick(TObject *Sender)
{
MessageBox(Handle,
"在BCB中用GDI+实现半透明渐变的特效窗口rn"
"-------------------------rn"
"by ccrun(老妖)rn"
"Welcome to [url]www.ccrun.com[/url]",
"GDI+ Window", MB_OK | MB_ICONINFORMATION);
}
//---------------------------------------------------------------------------
void __fastcall TfrmMain::miCloseAppClick(TObject *Sender)
{
Close();
}
//---------------------------------------------------------------------------
void __fastcall TfrmMain::miGoToCcrunClick(TObject *Sender)
{
ShellExecute(Handle, "Open", "http://www.ccrun.com", NULL, NULL, SW_SHOW);
}
//---------------------------------------------------------------------------
void __fastcall TfrmMain::miStayOnTopClick(TObject *Sender)
{
TMenuItem *mi = (TMenuItem *)Sender;
mi->Checked = !mi->Checked;
SetWindowPos(Handle, mi->Checked? HWND_TOPMOST: HWND_NOTOPMOST,
0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
}
//---------------------------------------------------------------------------
void __fastcall TfrmMain::miChangeSkinClick(TObject *Sender)
{
TOpenDialog *dlgOpen = new TOpenDialog(this);
dlgOpen->Filter = "PNG file(*.png)|*.png";
if(dlgOpen->Execute())
{
SetTransparent(WideString(dlgOpen->FileName), 100);
Invalidate();
}
delete dlgOpen;
}
?>
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