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;
}
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