MFC Button 的重绘 重绘的按钮消失解决思路
MFC Button 的重绘 重绘的按钮消失
CMyButton.h:
#pragma once
#include "afxwin.h"
class CMyButton : public CButton
{
//DECLARE_DYNAMIC(CMyButton)
public:
CMyButton();
virtual ~CMyButton();
//设置Button Down的背景颜色
void SetDownColor(COLORREF color);
//设置Button Up的背景颜色
void SetUpColor(COLORREF color);
BOOL Attach(const UINT nID, CWnd* pParent);
protected:
//必需重载的函数
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
public:
//三种颜色分别为文字,Button Down的背景颜色,Button Up的背景颜色
COLORREF m_TextColor, m_DownColor,m_UpColor;
};
CMButton.cpp:
#include "StdAfx.h"
#include "MyButton.h"
CMyButton::CMyButton(void)
{
m_DownColor = m_UpColor = RGB(0,0,0);//初始化设为黑色
}
CMyButton::~CMyButton(void)
{
}
BOOL CMyButton::Attach(const UINT nID,CWnd* pParent)
{
if (!SubclassDlgItem(nID, pParent))
return FALSE;
return TRUE;
}
void CMyButton::SetDownColor(COLORREF color)
{ //CMyButton类的函数
m_DownColor = color;
}
void CMyButton::SetUpColor(COLORREF color)
{
m_UpColor = color;
}
void CMyButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
CDC dc;
dc.Attach(lpDrawItemStruct->hDC);//得到绘制的设备环境CDC
VERIFY(lpDrawItemStruct->CtlType==ODT_BUTTON);
//得当Button上文字,这里的步骤是:1,先得到在资源里编辑的按钮的文字,
//然后将此文字重新绘制到按钮上,
//同时将此文字的背景色设为透明,这样,按钮上仅会显示文字
const int bufSize = 512;
TCHAR buffer[bufSize];
GetWindowText(buffer, bufSize);
int size=sizeof(buffer);//得到长度
DrawText(lpDrawItemStruct->hDC,buffer,size,&lpDrawItemStruct->rcItem,DT_CENTER|DT_VCENTER|DT_SINGLELINE|DT_TABSTOP);//绘制文字
SetBkMode(lpDrawItemStruct->hDC,TRANSPARENT);//透明
if (lpDrawItemStruct->itemState&ODS_SELECTED)//当按下按钮时的处理
{////重绘整个控制
CBrush brush(m_DownColor);
dc.FillRect(&(lpDrawItemStruct->rcItem),&brush);//利用画刷brush,填充矩形框
//因为这里进行了重绘,所以文字也要重绘
DrawText(lpDrawItemStruct->hDC,buffer,size,&lpDrawItemStruct->rcItem,DT_CENTER|DT_VCENTER|DT_SINGLELINE|DT_TABSTOP);
SetBkMode(lpDrawItemStruct->hDC,TRANSPARENT);
}
else//当按钮不操作或者弹起时
{
CBrush brush(RGB(255,255,0));
dc.FillRect(&(lpDrawItemStruct->rcItem),&brush);//
DrawText(lpDrawItemStruct->hDC,buffer,size,&lpDrawItemStruct->rcItem,DT_CENTER|DT_VCENTER|DT_SINGLELINE|DT_TABSTOP);
SetBkMode(lpDrawItemStruct->hDC,TRANSPARENT);
}
if ((lpDrawItemStruct->itemState&ODS_SELECTED)&&(lpDrawItemStruct->itemAction &(ODA_SELECT|ODA_DRAWENTIRE)))
{//选中了本控件,高亮边框
COLORREF fc=RGB(255-GetRValue(m_UpColor),255-GetGValue(m_UpColor),255-GetBValue(m_UpColor));
CBrush brush(fc);
dc.FrameRect(&(lpDrawItemStruct->rcItem),&brush);//用画刷brush,填充矩形边框
}
if (!(lpDrawItemStruct->itemState &ODS_SELECTED) &&(lpDrawItemStruct->itemAction & ODA_SELECT))
{
CBrush brush(m_UpColor); //控制的选中状态结束,去掉边框
dc.FrameRect(&lpDrawItemStruct->rcItem,&brush);//}
dc.Detach();
}
CMyButton.h:
#pragma once
#include "afxwin.h"
class CMyButton : public CButton
{
//DECLARE_DYNAMIC(CMyButton)
public:
CMyButton();
virtual ~CMyButton();
//设置Button Down的背景颜色
void SetDownColor(COLORREF color);
//设置Button Up的背景颜色
void SetUpColor(COLORREF color);
BOOL Attach(const UINT nID, CWnd* pParent);
protected:
//必需重载的函数
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
public:
//三种颜色分别为文字,Button Down的背景颜色,Button Up的背景颜色
COLORREF m_TextColor, m_DownColor,m_UpColor;
};
CMButton.cpp:
#include "StdAfx.h"
#include "MyButton.h"
CMyButton::CMyButton(void)
{
m_DownColor = m_UpColor = RGB(0,0,0);//初始化设为黑色
}
CMyButton::~CMyButton(void)
{
}
BOOL CMyButton::Attach(const UINT nID,CWnd* pParent)
{
if (!SubclassDlgItem(nID, pParent))
return FALSE;
return TRUE;
}
void CMyButton::SetDownColor(COLORREF color)
{ //CMyButton类的函数
m_DownColor = color;
}
void CMyButton::SetUpColor(COLORREF color)
{
m_UpColor = color;
}
void CMyButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
CDC dc;
dc.Attach(lpDrawItemStruct->hDC);//得到绘制的设备环境CDC
VERIFY(lpDrawItemStruct->CtlType==ODT_BUTTON);
//得当Button上文字,这里的步骤是:1,先得到在资源里编辑的按钮的文字,
//然后将此文字重新绘制到按钮上,
//同时将此文字的背景色设为透明,这样,按钮上仅会显示文字
const int bufSize = 512;
TCHAR buffer[bufSize];
GetWindowText(buffer, bufSize);
int size=sizeof(buffer);//得到长度
DrawText(lpDrawItemStruct->hDC,buffer,size,&lpDrawItemStruct->rcItem,DT_CENTER|DT_VCENTER|DT_SINGLELINE|DT_TABSTOP);//绘制文字
SetBkMode(lpDrawItemStruct->hDC,TRANSPARENT);//透明
if (lpDrawItemStruct->itemState&ODS_SELECTED)//当按下按钮时的处理
{////重绘整个控制
CBrush brush(m_DownColor);
dc.FillRect(&(lpDrawItemStruct->rcItem),&brush);//利用画刷brush,填充矩形框
//因为这里进行了重绘,所以文字也要重绘
DrawText(lpDrawItemStruct->hDC,buffer,size,&lpDrawItemStruct->rcItem,DT_CENTER|DT_VCENTER|DT_SINGLELINE|DT_TABSTOP);
SetBkMode(lpDrawItemStruct->hDC,TRANSPARENT);
}
else//当按钮不操作或者弹起时
{
CBrush brush(RGB(255,255,0));
dc.FillRect(&(lpDrawItemStruct->rcItem),&brush);//
DrawText(lpDrawItemStruct->hDC,buffer,size,&lpDrawItemStruct->rcItem,DT_CENTER|DT_VCENTER|DT_SINGLELINE|DT_TABSTOP);
SetBkMode(lpDrawItemStruct->hDC,TRANSPARENT);
}
if ((lpDrawItemStruct->itemState&ODS_SELECTED)&&(lpDrawItemStruct->itemAction &(ODA_SELECT|ODA_DRAWENTIRE)))
{//选中了本控件,高亮边框
COLORREF fc=RGB(255-GetRValue(m_UpColor),255-GetGValue(m_UpColor),255-GetBValue(m_UpColor));
CBrush brush(fc);
dc.FrameRect(&(lpDrawItemStruct->rcItem),&brush);//用画刷brush,填充矩形边框
}
if (!(lpDrawItemStruct->itemState &ODS_SELECTED) &&(lpDrawItemStruct->itemAction & ODA_SELECT))
{
CBrush brush(m_UpColor); //控制的选中状态结束,去掉边框
dc.FrameRect(&lpDrawItemStruct->rcItem,&brush);//}
dc.Detach();
}