MFC自定义CStatusBar文字的颜色

ゞ浴缸里的玫瑰 2024-03-16 22:53 101阅读 0赞

MFC里面的CStatusBar是没法自定义文字颜色的，需要我们自己绘制。这篇文章是在 [Display colored text on Status Bar][] 代码的基础上进行改进的，使用起来更方便。  
实现新建一个单文本框架的MFC程序，如下图所示：

![d15b3be9052456555bc0e287e0d2bf81.png][]

在MainFrm.h中，在类定义之前引入头文件：

#include " ColoredStatusBarCtrl.h"

将MainFrm.h中的**m\_wndStatusBar**换成CColoredStatusBarCtrl类型，代码如下：

//CStatusBar m_wndStatusBar;
    CColoredStatusBarCtrl m_wndStatusBar;

找到MainFrm.cpp中自动生成的数组，代码如下：

static UINT indicators[] =
    {
    	ID_SEPARATOR,           // 状态行指示器
    	ID_INDICATOR_CAPS,
    	ID_INDICATOR_NUM,
    	ID_INDICATOR_SCRL,
    };

在CMainFrame::OnCreate()函数 return 之前初始化 m\_wndStatusBar，代码如下：

//可以设置自动大小
    m_wndStatusBar.AutoSize = true;
    
    //初始化每个窗格
    for (int i = 0; i < sizeof(indicators) / sizeof(UINT); i++)
    {
    	CString str;
    	str = " ";
    	//更改状态栏样式，使其由所有者绘制
    	bool ret = m_wndStatusBar.GetStatusBarCtrl().SetText(str, i, SBT_OWNERDRAW);
    	//使每个窗格的大小相同
    	m_wndStatusBar.SetPaneInfo(i, m_wndStatusBar.GetItemID(i), SBT_OWNERDRAW, 100);
    }
    
    //设置字符串
    CString str;
    str = "123";
    m_wndStatusBar.SetText(m_wndStatusBar.CommandToIndex(ID_INDICATOR_NUM), str, RGB(255, 0, 0));

ColoredStatusBarCtrl.h 文件内容如下：

#if !defined(AFX_COLOREDSTATUSBARCTRL_H__4D49433F_617D_45A5_A207_5655A0BE779F__INCLUDED_)
    #define AFX_COLOREDSTATUSBARCTRL_H__4D49433F_617D_45A5_A207_5655A0BE779F__INCLUDED_
    
    #if _MSC_VER > 1000
    #pragma once
    #endif 
    
    #include <afxext.h>
    
    class CColoredStatusBarCtrl : public CStatusBar
    {
    public:
    	CColoredStatusBarCtrl();
    public:
    	CString m_szStatusString;
    public:
    	bool AutoSize=true;
    	void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
    	void SetText(UINT nID, CString txt, COLORREF cr);
    public:
    	virtual ~CColoredStatusBarCtrl();	
    protected:	
    	CMap<UINT, UINT, COLORREF, COLORREF>m_TxtColorMap;
    	CMap<UINT, UINT, CString, CString>m_TxtMap;
    	DECLARE_MESSAGE_MAP()
    };
    
    #endif

ColoredStatusBarCtrl.cpp 文件内容如下：

// ColoredStatusBarCtrl.cpp : implementation file
    //
    #include "pch.h"
    //#include "dlgviewtest.h"
    #include "ColoredStatusBarCtrl.h"
    
    #ifdef _DEBUG
    #define new DEBUG_NEW
    #undef THIS_FILE
    static char THIS_FILE[] = __FILE__;
    #endif
    
    
    CColoredStatusBarCtrl::CColoredStatusBarCtrl(){}
    
    CColoredStatusBarCtrl::~CColoredStatusBarCtrl(){}
    
    
    BEGIN_MESSAGE_MAP(CColoredStatusBarCtrl, CStatusBar)
    	//{
       {AFX_MSG_MAP(CColoredStatusBarCtrl)
    	//}}AFX_MSG_MAP
    END_MESSAGE_MAP()
    
    void CColoredStatusBarCtrl::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
    {	
    	// Attach to a CDC object
    	CDC dc;
    	dc.Attach(lpDrawItemStruct->hDC);
    	dc.SetBkMode(TRANSPARENT);
    
    	// Get the pane rectangle and calculate text coordinates
    	CRect rect(&lpDrawItemStruct->rcItem);
    	COLORREF cr;
    	CString txt;
    	if (m_TxtColorMap.Lookup(lpDrawItemStruct->itemID, cr))
    	{
    		dc.SetTextColor(cr);
    	}
    	if (m_TxtMap.Lookup(lpDrawItemStruct->itemID, txt))
    	{
    		dc.TextOut(rect.left + 2, rect.top, txt);
    		if (AutoSize) 
    		{
    			//设置提示框宽度	
    			CSize sz = dc.GetTextExtent(txt);
    			SetPaneInfo(lpDrawItemStruct->itemID, lpDrawItemStruct->CtlID, SBT_OWNERDRAW, sz.cx);
    		}		
    	}
    	// Detach from the CDC object, otherwise the hDC will be
    	// destroyed when the CDC object goes out of scope
    	dc.Detach();
    }
    void CColoredStatusBarCtrl::SetText(UINT nID,CString txt, COLORREF cr)
    {
    	m_TxtColorMap.SetAt(nID, cr);
    	m_TxtMap.SetAt(nID, txt);
    	//触发重绘	
    	SetPaneText(nID, txt);
    }

[Display colored text on Status Bar]: https://www.codeproject.com/Articles/2324/Display-colored-text-on-Status-Bar
[d15b3be9052456555bc0e287e0d2bf81.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/244d9a5a10544791acf820311847cf72.png