创建SWING风格的按钮控件

本文介绍如何创建SWING风格的按钮控件

基本思想：（1）按钮选中时，绘制已按钮中点为中心的蓝色矩形；

                （2）按钮预定义为自画风格；

                （3）以按钮本身矩形错位画线，采用不同的画刷，计划笔，产生                    SWING效果。

函数定义：

        CSwingButton::DrawButton(LPDRAWITEMSTRUCT lpDrawItemStruct)//画按钮

        void CSwingButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) //重载

         void CSwingButton::PreSubclassWindow() //通知风格自画

        CString CSwingButton::GetButtonText()//获得按钮文本---可以去除

        CSwingButton::CSwingButton()//设置按钮文本---可以去除

     void CSwingButton::SetButtonText(CString pString)

源程序如下：

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// SwingButton.h : header file
//

/////////////////////////////////////////////////////////////////////////////
// CSwingButton window

class CSwingButton : public CButton
{
// Construction
public:
 CSwingButton();

// Attributes
public:
    
protected:
   CString m_strCaption;   //file://定义文本
   CBrush nActiveBrush,nInactiveBrush;  file://定义画刷
   CPen  nDarkBorder,nWhiteBorder,nSelectBorder;  file://定义画笔
 

// Operations
public:

// Overrides
 // ClassWizard generated virtual function overrides
 file://{{AFX_VIRTUAL(CSwingButton)
 public:
 virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
 protected:
 virtual void PreSubclassWindow();
 file://}}AFX_VIRTUAL

// Implementation
public:
 void SetButtonText(CString pString);
 void DrawButton(LPDRAWITEMSTRUCT lpDrawItemStruct);
 CString GetButtonText();
 virtual ~CSwingButton();
   
 // Generated message map functions
protected:
 file://{{AFX_MSG(CSwingButton)
  // NOTE - the ClassWizard will add and remove member functions here.
 file://}}AFX_MSG

 DECLARE_MESSAGE_MAP()
public:
};

/////////////////////////////////////////////////////////////////////////////

file://{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_SWINGBUTTON_H__4C72E29F_5844_4E65_9E87_CB96602E4733__INCLUDED_)

#include "stdafx.h"
#include "TestSwing.h"
#include "SwingButton.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CSwingButton

CSwingButton::CSwingButton()
{//初始化
 nActiveBrush.CreateSolidBrush(RGB(110,110,110));
 nInactiveBrush.CreateSolidBrush(RGB(204,204,204));
 nDarkBorder.CreatePen(PS_SOLID,1,RGB(128,128,128));
 nWhiteBorder.CreatePen(PS_SOLID,1,RGB(255,255,255));
 nSelectBorder.CreatePen(PS_SOLID,1,RGB(153,153,204));

}

CSwingButton::~CSwingButton()
{
}

BEGIN_MESSAGE_MAP(CSwingButton, CButton)
 file://{{AFX_MSG_MAP(CSwingButton)
  // NOTE - the ClassWizard will add and remove mapping macros here.
 file://}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSwingButton message handlers

void CSwingButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
 // TODO: Add your code to draw the specified item
//调用画按钮函数 

DrawButton(lpDrawItemStruct);
 
}

void CSwingButton::PreSubclassWindow()
{
 // TODO: Add your specialized code here and/or call the base class
 
 CButton::PreSubclassWindow();
 ModifyStyle(0,BS_OWNERDRAW);//通知自画风格
}

CString CSwingButton::GetButtonText()
{
     return m_strCaption;//获得按钮文本
}

void CSwingButton::DrawButton(LPDRAWITEMSTRUCT lpDrawItemStruct)
{   
    CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
 CRect rectItem(lpDrawItemStruct->rcItem);

//获得按钮位置

 CPoint TopLeft(rectItem.left, rectItem.top);
 CPoint BottomRight(rectItem.right - 1, rectItem.bottom - 1);
 CPoint TopRight(rectItem.right - 1, rectItem.top);
 CPoint BottomLeft(rectItem.left, rectItem.bottom - 1);

//选中情况下的绘制

 if (lpDrawItemStruct->itemState & ODS_SELECTED)
 {
  pDC->SelectObject(&nActiveBrush);
  pDC->SelectStockObject(NULL_PEN);
  pDC->Rectangle(rectItem);
  goto WRITE_TEXT;
 }

//绘制

 pDC->SelectObject(&nInactiveBrush);
 pDC->SelectStockObject(NULL_PEN);
 pDC->Rectangle(rectItem);

 pDC->SelectObject(&nDarkBorder);
 pDC->MoveTo(TopLeft);
 pDC->LineTo(TopRight);
 pDC->MoveTo(TopLeft);
 pDC->LineTo(BottomLeft);

 pDC->MoveTo(BottomLeft.x, BottomLeft.y - 1);
 pDC->LineTo(BottomRight.x, BottomRight.y - 1);
 pDC->MoveTo(BottomRight.x - 1, BottomRight.y);
 pDC->LineTo(TopRight.x - 1, TopRight.y);

 pDC->SelectObject(&nWhiteBorder);

 pDC->MoveTo(BottomLeft);
 pDC->LineTo(BottomRight);
 pDC->MoveTo(BottomRight);
 pDC->LineTo(TopRight);

 pDC->MoveTo(TopLeft.x + 1, TopLeft.y + 1);
 pDC->LineTo(TopRight.x - 1, TopRight.y + 1);
 pDC->MoveTo(TopLeft.x + 1, TopLeft.y + 1);
 pDC->LineTo(BottomLeft.x + 1, BottomLeft.y - 1);

WRITE_TEXT:
 pDC->SetBkMode(TRANSPARENT);
 pDC->SelectStockObject(DEFAULT_GUI_FONT);
 CSize pExtent = pDC->GetTextExtent(m_strCaption);

//以下为绘制按钮文本

 CPoint centerPoint = rectItem.CenterPoint();
 CPoint drawText;
 drawText.x = centerPoint.x - (pExtent.cx / 2);
 drawText.y = centerPoint.y - (pExtent.cy / 2);

 pDC->TextOut(drawText.x, drawText.y, m_strCaption);

 if (lpDrawItemStruct->itemState & ODS_FOCUS)
 {
  pDC->SelectObject(&nSelectBorder);
  pDC->SelectStockObject(NULL_BRUSH);
  pDC->Rectangle(drawText.x - 1, drawText.y - 1,
   centerPoint.x + (pExtent.cx / 2) + 3,
   centerPoint.y + (pExtent.cy / 2) + 3);
 }
 
}

void CSwingButton::SetButtonText(CString pString)
{

//设置按钮文本
 m_strCaption=pString;

}